Patent Application
20080067225
The present invention relates to an apparatus for and method of forming containers for use in packaging articles, particularly the packaging of single or multiple flat articles, such as books or video cassettes and disks such as LP records CDs, CD-ROMs and DVDs. The invention further relates to a container blank and an apparatus and method of forming the blank. The invention vet further relates to a container package (that is, including packaged articles) constructed using the apparatus, method and/or blank of the invention. The invention most particularly relates to the method and apparatus used to form and handle a container blank and to shape the blank into a package for constraining at least one article therein for dispatch or storage.
The invention particularly relates to an apparatus for and method of modifying container blanks made of card or similar material, the blanks being modified to include an article retaining means to secure articles therein and prevent damage-causing movement within the container formed from the blank. Additionally, the invention relates to a container forming machine which takes container blanks having an article retaining means and forms a packaging containers for articles having a relatively large surface area as compared to the associated thickness or depth thereof, such as books, video cassettes and discs of various formats. These articles need to be held securely container to prevent damage thereof during transit. A method of forming containers is also disclosed.
The methods, apparatus, blanks and final package as described hereinbelow are described with reference to flat articles such as those exemplified above, however it should be appreciated that no such limitation exists.
It will be appreciated by the skilled addressee that the invention, although directed towards the packaging of substantially flat articles, may be applied to any three-dimensional object locatable within the container and is not limited to similarly shaped articles such as books and video cassettes.
Increasingly, customers are eschewing the time-consuming routine of travelling to purchase their shopping and/or business needs. It is now common for purchases to be made by mail order, telephone and via the Internet and email. As a consequence, for goods to be received there is a market increase in the use of postal and courier services to deliver the purchases.
The further involvement of postal services and other delivery systems is different from the traditional mode of shopping where the customer travels to purchase articles over the counter and returns using public or their own transport means. In this scenario, packing or packaging is done at the counter or before the customer leaves, after which responsibility for damage no longer resides with the seller. As most postal and courier services either limit their liability for damage to articles delivered by them or charge significant premiums for insurance against such damage, it falls to the retailer, warehouseman or company dispatching the purchase to ensure there is minimal risk of damage during transit to the customer. The term “postal” as used herein is intended as a convenient expression of all local, national and international dispatch and courier services, including drop-shipping services.
With the increased popularity of Internet shopping and the dispatch of ordered articles via the postal system the requirement for packaging has increased manyfold. The popularity of such websites as Amazon™ and eBay™ have increased the postal traffic of books, CDs, CDROMs and DVDs amongst others. Due to the vast turnover of dispatched articles and the inherent risks associated with the bulk handling of goods, there is a market requirement for sturdy containers. Additionally, as the volume of mail order catalogue business increases so to does the volume or returns. This has a severe consequence on the profitability of the mail order transaction and, where the returned article is damaged, the customer must bear responsibility for the damage. This condition of sale often has repercussions for customer relationships.
In other words, a fundamental requirement of any method of goods transportation is that the goods are not damaged during transport so that they reach their destinations in a non-damaged state.
It has been found in practice, that the packaging of articles such as books, records, and similar articles having at least one surface with a relatively large surface area in relation to depth or thickness of the article has presented, in terms of packaging, a significant ongoing problem. This problem manifests itself particularly in situations where the articles are packages on a production line basis by a packaging method involving the folding of a card or the like blank into a container for receiving an article to be packed.
Containers formed from blanks made of card and cardboard and other materials suitable for dispatch through the postal services are well known in the prior art. Generally, the containers are formed from a relatively simple blank having side walls separated by fold lines and one or more base and lid portions connected to one or more of the side walls by corresponding fold lines. To construct the container an end tab of one side wall is secured to an edge portion of another side wall and the or each base portion is folded and secured to form an open-mouthed container. When the or each article to be dispatched has been placed within the container, the or each lid portion is folded and secured. The means of securing the portions to form the container is normally selected from gluing or stapling.
There are many examples of the above types of container in the prior art, including the standard RSC, a modified arrangement of which is discussed hereinbelow with respect to a detailed embodiment of the invention.
It will be appreciated that unless the container is designed to receive the specific article(s) to be dispatched, further packaging materials will be required to prevent the article(s) moving about within the container. In the packaging industry generally there is a move to obviate extraneous packaging materials and in some countries there are regulations and legislation to prevent wasteful packaging practices.
The invention is directed to overcoming some of the established disadvantages associated with prior art containers, particularly those realising a container which is adapted for encapsulating or otherwise securing one or more articles within the container to prevent damage due to movement within the container during transit to its destination.
In an attempt to obviate some of the disadvantages highlighted above, a solution suggested in the prior art is to utilise a web of lining material to secure the articles within the container.
One established solution is to place the articles for dispatch in a tray, usually of a cardboard material. The tray and articles are then wrapped by a web of plastics material which is subsequently heated to effect a shrink-wrapped package. Alternatively, the web or film is tensioned around the article(s) by folding elements of the tray to which the web is attached. This package is then placed into a pre-formed container which is finally sealed and marked for dispatch. This arrangement, however, has its own disadvantages including that, although the articles are bound together, the tray will often move sufficiently in the container to dislodge the articles from the tray. Furthermore, this arrangement does not avoid the use of unnecessary additional packaging materials and includes an extra stage in the packaging process.
In another solution proposed by the Applicant in United Kingdom Patent No. GB 2 343 885 (which is incorporated herein by reference) there is described a container blank to which a sheet or web of lining material is secured. This lining material is shrink-wrappable so that articles may be placed directly into the container and secured in situ.
Although providing significant improvements over the prior art, the container and container blank disclosed in GB 2 343 885 is not suitable for machine forming into a container. While there is significant demand for contaminations which are manually formed (particularly for low volume operation), high volume dispatch centres or drop-shippers, for example, require fully automated systems. The advantages of machine forming of a container from a blank will be apparent to the skilled addressee.
For cost reasons and to adhere to requirements, in particular those relating to crush resistance, it is desirable to make use of the inherent strength provided by the “nape” of corrugations formed within the cardboard material. It is for this reason, together with the low failure rate of such material, that multi-ply, high-grade cardboard materials are considered despite their relative expense and the accuracy to which the blanks must be formed. Where inexpensive materials are used, the proportion of failures and machinery wear increases, consequently machine downtime and process stoppages deleteriously affect efficiency.
From reading the prior art, it is known that container blanks are usually formed using a die-cutting technique which includes stamping of fold lines. The blanks are then introduced to a folding station where a container is formed. The open-mouthed container is then filled and sealed for dispatch. In an alternative prior art arrangement, the article(s) to be packaged is/are placed onto a blank and passed to a sealing station where the container is formed around the article(s) and sealed using hot-melt glue.
It is an object of the present invention to provide a packaging system that seeks to alleviate the disadvantages associated with the prior art and seeks to minimise(s) the risk of damage to an article during post packaging handling and during transit.
Accordingly, it is an object of the invention to provide a container blank suitable for machine forming and to provide a container so formed for receiving articles to be secured therein prior to dispatch.
It is a further object of the invention to provide an apparatus for forming container blanks of the invention.
It is an additional object of the invention to provide an apparatus for forming and filling containers for dispatch at high speed and which facilitates the use of standard electronic interfaces and control instrumentation.
It is a yet further object of the present invention to provide a method for the forming and filling of containers in accordance with the invention.
Accordingly, the present invention provides a container blank comprising:
Conveniently, the material adapted to retain an article within the container formed from the blank is a shrink-wrappable material.
Advantageously, the side and end wall portions are so sized and shaped to be machine foldable.
Preferably, the container blank is cut from a card material having a nape oriented to add to the strength of the container formed.
The present invention provides a container comprising:
Conveniently, the material adapted to retain an article within the container formed from the blank is a shrink-wrappable material.
Advantageously, the side and end wall portions are so sized and shaped to be machine foldable.
Preferably, the container blank is cut from a card material having a nape oriented to add to the strength of the container formed.
The present invention further provides an apparatus for forming a container blank of the type having an article retaining means thereon, the apparatus comprising:
Advantageously, the apparatus includes a pressure applying means for bonding the web material to the inner surface of the blank.
Conveniently, the means for dispensing a supply of blanks comprises a support table having a vacuum operated picker mechanism which individually selects a blank from the base of a magazine of blanks and introduces the blank to a glue application station.
Advantageously, the table includes a blank edge support means for retaining the blanks within the magazine, the picker mechanism engaging the base portion of the selected blank and deflecting it to disengage said edge support means.
Optionally, the means for dispensing a supply of blanks comprises a pair of lift tables mounted on a carriage adapted for lateral movement with respect to the direction of travel of blanks within the apparatus, the dispensing means including a vacuum operated picker mechanism which individually selects a blank from the top of a magazine of blanks and introduces the blank to a glue application station.
The present invention yet further provides a method for forming a container blank of the type having an article retaining portion thereon, the method comprising:
Advantageously, the method includes applying pressure to the inner surface of the blank to bond the web material.
The present invention further provides an apparatus for forming a container from a container blank of the type having an article retaining portion thereon, the apparatus comprising:
shrink-wrapping station where heat is applied to the overlying ends of the material so that the or each article placed in the container at the packing station is secured therein;
lid closing station where the lid portions are brought together in overlying relationship so that pre-applied pressure-sensitive adhesive thereon seals the lid closed; and
a dispatch conveyor which carries the container through final stages or to storage.
Conveniently, the feeding station comprises a pivotable destacking arm adapted to individually select a blank from magazine of vertically stacked blanks.
Optionally, the feeding station comprises a pair of lift tables mounted on a carriage adapted for lateral movement with respect to the direction of travel of blanks within the apparatus, the dispensing means including a vacuum operated picker mechanism which individually selects a blank from the top of a magazine of blanks and introduces the blank to a glue application station.
The present invention further provides a method for forming a container from a container blank of the type having an article retaining portion thereon, the method comprising:
abutting the inner surface of the base of the container blank with an actuator member and forcing the blank into a container-forming die, the die being so formed and shaped as to cause sections of the blank to fold about pre-formed score lines;
The invention yet further provides an apparatus for feeding open-mouthed containers via a packing station to a sealing and closing station in preparation for dispatch or storage of the packaged articles, the apparatus comprising:
The invention yet further provides a method of for feeding open-mouthed containers via a packing station to a sealing and closing station in preparation for dispatch or storage of the packaged articles, the method comprising:
Additional features of the invention and its advantages, together with further objectives of the invention will be apparent from the detailed description of the preferred embodiments below, when read in conjunction with the accompanying drawings.
The invention will now be described more particularly with reference to the accompanying drawings which show, by way of example only, a construction of container blank, an apparatus for forming a container blank, a method of constructing a container blank, an apparatus for forming a container from a blank and a method of forming a container suitable for dispatch, in accordance with the invention. In the drawings:
a is a plan view of a prior art container blank suitable for packaging articles by manually folding sections of the blank about an article to form a container therefore;
b and 1c are top plan views of a container formed from the prior art blank of
a is a plan view of a container blank in accordance with the invention, the container being both manually and machine foldable;
b and 2c are top plan views of a container formed from the blank of
a is a plan view of an apparatus for applying the plastics material sheet to the pre-formed blank of
b is a side elevation of the apparatus of
c is a side elevation of the apparatus of
d is a first arrangement of blank feeding mechanism comprising a support table for metering blanks to the lining apparatus;
e(i) to 3e(v) are end elevations on Arrow x of
a and 6b are side elevations of the process steps of forming a container from a blank using an alternative arrangement of container forming apparatus;
c(i) to 6c(v) are end elevations on Arrow X of
a to 8c are a plan view, a side elevation and an end elevation of a heat chamber for shrink wrapping the articles within the containers; and
In the description that follows, the terms “left”, “right”, “upstream” and “downstream” should be regarded with respect to the drawings only and relate to the processing and conveyance of a blank and container formed from the blank as it moves through the apparatus. In this arrangement, “upstream” represents the source of raw material or a yet-to-be-processed container blank and “downstream” towards the accumulation point for storage or dispatch.
The terms “side walls” and “end walls” are used conveniently to describe pairs of opposed walls and should not be considered as limiting. Certain portions or tabs are also described in a similar fashion, again only to assist the reader.
Referring now to the drawings, and initially to
Referring specifically to each end wall 3B,5B, an over-tab fold line 3D,5D is formed in the blank running parallel to the riser fold line 3A,5A. The distance between the riser fold lines and over-tab fold lines fold lines 3D,5D is effectively twice the thickness of that of the card material from which the blank is formed, for reasons to be mentioned hereinafter. The dimensions of the blank are such that the portion thereof extending outwardly of the over-tab fold lines 3D,5D define tuck-in flaps 7, each having short rectangular extensions 7A,7B that are formed to engage corresponding receiving slots 8A,8B disposed in the base 2 immediately adjacent the end wall base fold lines 3,5.
A removable push-out portion 9 is disposed centrally along the outer edge of each end wall 3B,5B such that the push-out portion 9 includes a substantially rectangular part 9A that bridges the space between the riser fold line 3A,5A and the over-tab fold lines 3D,5D and a semicircular part 9B opening into the end wall itself 3B,5B. End corner regions 7C of the tuck-in flaps 7 are angled to facilitate folding of the blank during the container forming process.
Referring now to the side walls 4B,6B, each end thereof is provided with a tuck-in flap 4C,6C having the same height dimension as the side walls 4B,6B which define the depth of the container to be formed from the blank. The tuck-in flaps 4C,6C are foldable over the end-flap fold lines 4D,6D to be positioned adjacent the inner face of the end walls 3B,5B. Consequently, the tuck-in flaps must be, in its longest dimension, slightly less than half of the width (long dimension) of the end walls 3B,5B but sufficiently long to provide structural support for the container thus formed without encroaching on the area adjacent to the push-out portion 9. The tuck-in flap 4C,6C are parallel components that enhance the overall strength of the finished container. At least one of the free corners of the tuck-in flaps 4C,6C is tapered to facilitate easier folding.
A first lid forming portion 10 extends from one side wall 6B and is connected thereto via the side wall riser fold line 6A. Each end of the first lid portion 10 includes a fold-in flap 10B foldable around a lid-flap fold line 10C. As will be noted from
The depth of the first lid portion 10, that is from the riser fold line 6A to a free edge 10G of the lid portion 10, the edge 10 G essentially comprising the leading edge of the blank 100. It will be noted from
A second lid portion 11 extends from the other side wall 4B by way of the corresponding riser fold line 4A. This lid forming portion 11 is deeper than the first lid forming portion 10 so that the second lid portion 11 partially overlies the first lid portion 10 when folded over the open-mouthed container when formed.
Similarly to the first lid portion 10, each end of the second lid portion 11 includes a pair of tuck-in flaps 11B that are foldable about lid-flap fold lines 11C that align with the inner long edge of the rectangular slot 8A in the base 2. Each end of the second lid part 11 also includes a second tuck-in flap 11D which folds about a fold line 11E. These second flap fold lines 11E fold outside the lid flap fold lines 11C and are in line with the base fold lines 3,5 of the respective end walls 3B,5B. When folded into position, the second tuck-in flaps 11D engage the aperture defined by the rectangular part 9A of the removable push-out portions 9. The two flaps 11B and 11D are shaped to facilitate the actual tucking-in process.
To form a container from the prior art blank of
The lid tuck-in flaps 10B,11B are folded to a position perpendicular to their respective lid portions 10,11. The shorter tuck-in flaps 11D of the second lid portion 11 are turned to the positions in which they are able to engage the rectangular part 9A of the removable push-out portion 9. The lid portion 10 is then folded along the side wall riser fold line 6A to overlie the base part 2 and the tuck-in flaps 10B of the lid 10 are positioned to lie against the now inwardly facing surface of the end wall tuck-in flaps 7. The second lid portion 11 is subsequently folded along its riser fold line 4A to overlie the open-mouthed container and a proportion of the first lid portion 10. The tuck-in flaps 111B of the second lid portion 11 are also positioned adjacent the exposed surface of the end wall tuck-in flaps 7 and the shorter tuck-in flaps 11D of the lid 11 are engaged in the rectangular aperture 9A.
It will be found that thus folded blank provides a stiff rectangular box like container.
In practice, in accordance with the requirements of packaging method involved the article to be packed (not shown) is required to be placed at a required location within the thus formed container, the location usually being symmetrically positioned within the dimensions of the base. After such a placement, the blank is folded in the manner discussed around the previously positioned article.
This means that if the size of the article is such that it effectively fills the container the article when in the container is not likely to move about within the container during prior transit. If, however, the article is smaller than the interior of the containers it follows that the article would be at least relatively free to displace within the container and thus be prone to possible damage during transit.
It will be appreciated that when, for example, a large number of similar articles are to be packed such as compact discs, books, and other flat articles are involved it does not follow that always only single articles are involved. Clearly, in the case of books their thickness can vary within wide limits.
Also, it is clearly not commercially possible to provide for every differently sized article a precisely dimensioned container tailored for each such article so that the article is an exact fit in the container. In view of this it is conventional practice to provide a range of differently sized containers, with each container of the range being intended to accommodate a range of possible sizes of articles. This practice has the result that if an article is an exact fit in the container relative displacement is not likely to occur. Whereas if the article is dimensionally smaller than the maximum size accommodatable by a container any such articles would be effectively free to move about within the container in a manner set by the nature of any post packaging handling.
In order to deal with this problem it is proposed accordance with an aspect of the invention to provide the container forming blank 1 with an auxiliary/inner packaging for the article that is adapted to restrain the article against movement after it is placed at the requires location upon the container base. With this arrangement when the blank is folded into container form, the auxiliary packaging is effectively automatically brought into its displacement restraining condition.
In the above description of the prior art blank no consideration has been given to the article retaining means which comprises a flexible lining material secured to the base 2 of the blank 1. As schematically shown in
When packaging an article 16 it is placed on the lining material 12 and the two flaps 14,15 are folded over the article 16. Depending on the nature of the article being packed, the overlying edge regions of the lining material flaps 14,15 are stuck together to hold the article firmly in place. This can be done either prior to the container being formed from the blank or after.
c schematically illustrates a container of the invention in an open-mouthed configuration in which one or more articles have been constrained using the lining material 12. The lining material covers the base 2 of the container with enough length to overlap each end thereof so as to allow the free ends of the film to be stuck together. Tension lines 17 indicate the restraining mechanism of the film 12. If thought convenient, lines of adhesive are provided around the four sides of the base 2 to hold the lining 12.
A machine-foldable blank 100 of the present invention will now be described with reference to
Referring specifically to each end wall 3B,5B, an over-tab fold line 3D,5D is formed in the blank running parallel to the riser fold line 3A,5A, the distance between the riser fold lines 3A,5A and the over-tab fold lines 3D,5D being effectively twice the thickness of the card material from which the blank 100 is cut, for the same reasons as described with respect to the prior art blank 1.
The end walls 3B,5B of the blank 100 include tuck-in flaps 7 extending outwardly of the over-tab fold lines 3D,5D. The tuck-in flaps 7 each have short profiled extensions 7A,7B which are formed to engage corresponding receiver slots 8A,8B disposed in the base 2 immediately adjacent the end wall base fold lines 3,5.
It will be noted that the length of the over tab fold lines 3D,5D are marginally shorter than the adjacent riser fold lines 3A,5A so that a bevelled edge is formed to facilitate smooth and rapid machine folding. Similarly, the extensions 7A,7B are profiled to facilitate smooth and rapid machine registration of the tabs 7A,7B into their corresponding receivers 8A,8B. The modified profiles obviate the requirement to profile the distal corners of the tuck-in flaps 7. The square corners of the flaps 7 provide additional rigidity and strength to the container thus formed and facilitate machine forming. More particularly, it should be noted that the end wall riser fold lines 3A,5A are formed using deeper and/or larger perforations than those of the corresponding over-tab fold lines 3D,5D to ensure that the riser fold lines 3A,5A fold before the over-tab fold lines 3D,5D. This is important not only to facilitate the correct formation of the container but also to correctly position the extension tabs 7A,7B for engagement into the corresponding receivers 8A,8B. Ideally, the perforations forming the over-tab fold lines 3D,5D extend 50% of the corresponding number, length or depth (as appropriate) of the perforations forming the end wall riser fold lines 3A,5A.
In comparing the final folding stages of the container formed from the blank 100 of the present invention and that of the exemplifying prior art, as shown in
Although the above modifications and many of those described hereinbelow are visually insignificant, it has been found that such changes aid folding and forming to a disproportionate degree and, more importantly, facilitate machine folding. Additionally, certain features of the prior art blank 1, particularly those to aid manual handling (such as the removable push-out portions 9 and the flaps 11D inserted therein), are now obviated.
Referring now to each side wall 4B,6B each end thereof is provided with a tuck-in flap 4C,6C having substantially the same height dimension as the side walls 4B,6B which defines the depth of the container to be formed by the blank 100. The tuck-in flaps 4C,6C are foldable over end flap fold lines 4D,6D to be positioned adjacent the inner face of the end walls 3B,5B. Consequently, the tuck-in flaps 4C,6C must be, in their longest dimension, slightly less than half of the width (long dimension) of the end walls 3B,5B and provide significant structural integrity for the end walls. At least one of the free corners of the tuck-in flaps 4C,6C is rounded to facilitate machine folding.
As before, a first lid forming portion 10 extends from one side wall 6B and is connected thereto via the corresponding riser fold lines 6A. Each end of the first lid forming portion 10 includes a fold-in flap 10B foldable around a lid flap fold line 10C. As will be noted from
The depth of the first lid portion 10 is from the riser fold line 6A to a free edge 10G of the lid portion 10, the edge 10G essentially comprising the leading edge of the blank 100. As such there is a registration shape 12 cut into the free edge 10G for positioning the blank within a forming machine. A corresponding registration shape 12 may be formed on a trailing edge 11E of a second lid portion 11. The registration shape assists with the automatic handling of blanks and allows leading edge or trailing edge sensor registration.
The second lid portion 11 extends from the opposite side wall 4B to that of the first lid portion 10, by way of a corresponding riser fold line 4A. This lid portion 11 is wider, from the riser fold line to the trailing edge 11G, than the first lid portion 10 so the second lid portion 11 partially overlies the first lid portion 10 when folded onto the open-mouthed container.
Similarly to the first lid portion 10, the second lid portion 11 includes a pair of tuck-in flaps 11B that are foldable about lid flap fold lines 11C. The leading edge 11E of each lid flap 11B is bevelled and rounded to assure smooth machine folding. Adjacent the trailing edge 11G of the lid 11, bevelled end portions 11F are formed to ensure that the glued-down trailing edge 11G does not present any corners or portions which could be snagged or pulled when the container is closed.
The blank 100 further includes a heat shrinkable lining material 12 which is attached to the base 2, at least.
It will be appreciated by the skilled reader that by applying the glue lines parallel to the direction of travel of a blank through the apparatus applying the liner, the glue may be applied continuously and at high speed. The momentum of the blank as it is processed need not be interrupted. Additionally, by applying the glue in this orientation, the shrink wrapping of articles within the container is enhanced as the film/lines can pull together between the glue lines to give a better grip on the articles contained.
In the illustrated embodiment, four lines of adhesive are used to fix the central portion of the film to the blank 100. Two flaps 14,15 of the material or film 12 are adapted to be folded over the contents of the container, however, during assembly of the blank and transport thereof, the flaps 14,15 are retained in position by one or more “glue spots”. 13a applied to the underside of the lid portions 10,11. Advantageously, the blank can be machine folded to form an open-mouthed container without risk of the film being dislodged or trapped by folding portions during the container forming process or during automated or manually filling the container. Additionally, by using simple glue spots to retain the flaps 14,15 to the lid portions, the flaps can easily be torn away from the lid portions 10,11 when required to cover or overlie the contents of the container.
As discussed hereinabove, the orientation of the blank and the direction of travel of a blank through a machine is described with respect to the leading and trailing edges 10G, 11G of the blank 100 and the terms “upstream” and “downstream” are defined with respect to the source of materials and the conveying destination, respectively. The fact that materials may be sourced from different physical direction is irrelevant to the above definition.
With reference now to
In the illustrated embodiment, the liner apparatus 20 comprises a first arrangement of blank feeding mechanism 22 comprising a magazine adapted to receive plain blanks cut to the required specification. The mechanism, as is described in more detail hereinbelow, is provided at the upstream end of the liner apparatus 20 and includes a vacuum circuit 24 and optionally a mechanical pusher 25 to introduce blanks individually to a glue application station 26. Gripper or nip rollers 28 are used to guide the blank between top and bottom feed belts 29 which carry the blank past glue applicator guns 30 at which time hot melt glue is selectively applied to the blanks. The hot melt glue is applied by four glue guns 30 fed via heated hoses 31 from a hot melt glue storage tank 32 under microprocessor control. The hot melt adhesive is applied to the blank by a reciprocating compressed air position pump to generate pressure and solenoid operated applicator guns 30 to open the pressure circuit to atmosphere, thereby accurately firing the adhesive onto the board at points controlled by the central control unit in accordance with the requirements determined by the shape and design of the blank 100. The blank is then fed to the liner application station 35 where shrink-wrap material 36 is applied to the blank. The material is fed to the application station 35 from a film drive system 37.
The shrink-wrap material 36 is provided as a film web from a reel 38 mounted for rotation on a gravity axis 39 positioned towards the downstream end of the apparatus. As a first reel 38 of the material is depleted, the gravity axis 39 moves to activate a splicing mechanism of the type well appreciated in the art. An accumulator comprising a dancing arm roller 40 ensures that film is provided to the apparatus during splicing so that an uninterrupted supply is achieved. The film web is fed via a series of support rollers 42 through a non-return gripper 43 to a pressure roller arrangement 45 which adheres the film 36 to the blank 100 and applies pressure to spread the glue between the blank and the liner 12 of film material 36. A film web cutter 46 has a transverse cutter which operates “on the fly” and cuts using a cold blade protected within a slotted anvil.
In an alternative arrangement (not shown), the web material is applied to the blank in two separate sections, whereby at least a central region of the base remains uncovered by the material. In such an arrangement, the operation of the cutter defines the length and position of the web applied to the blank. If required, the base has no web material applied thereto and lengths of web material are adhered only to the end walls.
A transfer conveyor 47 moves the blank with liner 12 towards a pair of speeder pinch belts 49 which accelerate the blank and liner onto a collating table 50. When the table 50 is full, a discharge transfer mechanism 51 moves the accumulated stack of blanks to an ejector table 52, which comprises a conveyor 53 disposed at 90° to the direction of travel of the blanks through the apparatus 20.
c illustrates a second arrangement of apparatus for forming blanks which features an alternative arrangement of blank feeding mechanism 70 but in all other respects is identical to the apparatus of
d is a perspective elevation of the first arrangement of blank feeding mechanism 60 provided at the upstream end of the lining apparatus 20. The mechanism comprises a support table 61 having a pair of adjustable side plates 62, each having an inwardly facing blank edge engagement portion 63. An end plate 65 is provided to square the stack of blanks into a magazine feed. On the underside of the table 61 an upwardly facing vacuum operated suction cup 66 is provided on a pair of rails 67 along which the cup is free to move. To feed a single blank into the blank lining apparatus 20, the suction cup 66 is brought upwardly into contact with a blank 100 from the base of the stack. The vacuum is switched ON and the cup 66 engages the blank. The cup is then moved downwardly, deflecting the centre of the blank so that the edges thereof are pulled from the blank edge engagement portions of the side plates 62. The individual blank is then presented to the lining apparatus 20 by the movement of the cup 66 along the rails 67. Gripper rollers 28 of the lining apparatus 20 then take the blank as the vacuum to the cup 66 is released. The suction cup assembly then moves back along the rails 67 to its central position, ready to select the next blank.
Referring now to
In common with the first arrangement of picker mechanism of
When the blanks 100 are in position in the stack or magazine, the picker arm 75 moves to engage the upper surface of the top blank in the stack. When the arm engages the stack the vacuum is switched to the suction cups which grip the blank. A pressure differential switch in the vacuum circuit will register whether the cups have obtained an adequate grip to lift the board from the stack. The picker arm 75 is then moved back to a central position with the blank and subsequently is extended to carry the blank in a downstream direction, placing the leading edge 10G of the blank 100 between a pair of rotating nip rollers 28 which carry the blank into the lining apparatus 20.
At the instant the nip rollers 28 grip the blank and commence feeding it into the lining apparatus, a valve switches to remove the vacuum pressure from the suction cups 77 thereby releasing the board. The picker arm 75 then returns towards the central position until the trailing edge 11G of the blank passes a sensor which via the controller signals the picker arm 75 to engage another blank from the stack. The next blank is fed to the nip rollers 28 as before with a relatively small gap (say 50 mm) between the trailing edge 11G of one blank and the leading edge 10G of the subsequent blank.
As the stack is depleted, the first lift table A elevates to supply a continuous feed of blanks to the picker arm. As the table reaches its upper lift limit with a predetermined number of boards (say 30) left in the stack, a support mechanism comprising edge support plates 79 moves under the remaining blanks and the first lift table A is withdrawn. At this time, a second lift table B has been fully loaded with blanks and is ready to replace the position occupied by the first table A.
Provided confirmation is received that the second table B is loaded, the shuttle carrier 72 is signalled to move the second table B towards the central position to align with the picker mechanism 75 as the first table A is lowered and is made ready to receive a subsequent load of blanks. During this procedure, the picker arm 75 continues to table blanks from the support mechanism plates 79. When the stack on the second table B is aligned with the picker mechanism 75, the blanks remaining on the support plates are dropped onto the top of the stack as the support plates are withdrawn. This stack is then raised by the lift table B so that the uppermost blank is in the appropriate position to be engaged by the picker arm. The support plates 79 again engage the underside edges of the last blank remaining in the stack when the level reaches a preset amount. This means the machine can be run continuously without stoppage to maximise productivity rates.
The container forming apparatus 120 further includes a static folding die 135 having peripheral edge portions 136 adapted to deflect elements of a container blank sequentially to facilitate the formation of a container in conjunction with the forming tools 127,128. The folding die 135 includes suction cups 138 to engage the base 2 of a container being formed so that the container is not inadvertently withdrawn from the die 135 with the primary forming tool 127 when it is retracted. Air cylinders 139 are positioned on opposite sides of the folding die to urge elements of the container blank to urge elements of the container blanks inwardly so that they may be engaged during the downward stroke of one of the forming tools 127,128. The carriage arm 130 provides a rail along which the primary and secondary forming tools 127,129 move. Wheeled coupling arrangements 140 are attached to a tool carrying support member 142 to which the forming tools 127,128 are secured a fixed distance apart. The tools are fixed to the support member 142 by telescopic cylinders 145 which are pneumatically operated in this embodiment. The primary forming tool 127 includes blank engaging suction cups 147 attached to the vacuum circuit via the support member 142 which also conveys pneumatic power to the telescopic cylinders 145 and to air cylinder 148 provided within the secondary forming tool 128. Adjacent the folding die 135, and spaced therefrom a distance equal to the distance separating the primary and secondary forming tools, 127,128, there is provided a discharge conveyor 150 for transporting open-mouthed containers to a filling station or to storage.
Each step of the container forming process, as illustrated in the twelve vignettes or frames making up
The sequence is shown at the start of a production run with no containers in the process of being formed. In Frame 1, a first blank is selected by the destacking arm 123 when the arm moves from a horizontal rest position about its pivot 124 to the front surface of the leading board in the magazine. A vacuum is switched to the suction cups 125 which engage the blank and separate it from the magazine stack. The blank is carried with the arm as it pivots towards its horizontal rest position. In Frame 2, the primary and secondary forming tools 127,128 move together on the support member 142 as it is driven along the carriage arm 130 and the primary forming tool 127 is lowered to abut the now horizontal blank, as supported by the destacking arm. The suction cups 147 on the base of the primary forming tool 127 engage the inner lined side of the blank at the base 2 and the vacuum is switched OFF at the destacking arm suction cups 125 and ON at the tool suction cups 147. As illustrated by Frame 4, the blank is then lifted by the primary forming tool suction cups 147 and the support member 142 moves the primary forming tool 127 towards a precise position over the container folding die 135. At the same time, the destacking arm 123 rotates about the pivot 124 from its horizontal rest position towards the new leading (second) blank in the magazine. As the blank is engaged by the suction cups 125 of the destacking arm, as illustrated in Frame 5, the primary forming tool 127 lowers the first blank towards the folding die 135 and “stuffs” the blank into the die.
As the blank is “stuffed” into the die, the following folding actions occur:
In Frame 6, the cuboid shape is retained in the folding die 135 by the suction cups 138 disposed in the bottom of the die and the primary forming tool 127 is then withdrawn from the cuboid as the vacuum to the forming tool suction cups 147 is removed. As the tool is withdrawn, the subsequent blank is taken from the magazine by the destacking arm 123, as described above.
When the new blank is in a horizontal position, as shown in Frame 7, the support member 142 is moved along the carriage arm 130 so that the primary forming tool 127 is disposed over the region of the blank due to form the base 2 of the next container and the secondary forming tool 128 is disposed over the folding die 135 containing the open-mouthed cuboid shape of the preceding blank. At this stage, the folding die air cylinders 139 (one pair on each side) push pistons to fold the tuck-in flap positions of each end wall 3B,5B over the lighter riser fold lines 3A,5A (thereby ensuring that the fold occurs at the riser fold lines 3A,5A in advance of any folding along the over-tab fold lines 3D,5D). The pistons retain the flap portions 7 in a substantially horizontal position. It should be noted that the pistons are disposed towards the edges of the flap portions 7 so as not to impede the secondary forming tool 128 when it descends into the folding die.
Frame 8 shows the primary forming tool engaging the subsequent blank as supported by the destacking arm, as the secondary forming tool is forced into the folding die. In this sequence, the secondary forming tool 128 folds the tuck-in flap portions 7 into the open-mouthed cuboid shape of the container and the air cylinders 148 within the secondary forming tool 128 include pistons which force the tuck-in flap positions 7 against the side wall tuck-in flaps 4C,6C. This pushes the short rectangular extensions 7A,7B of each flap portion 7 into the corresponding receiver slots 8A,8B disposed in the base 2 immediately adjacent the end wall base fold lines 3,5.
The pistons of the air cylinders 148 within the secondary forming tool 128 include spikes at their free ends so that by engaging the material of the newly formed open-mouthed container, the container is withdrawn from the folding die when the secondary forming tool 128 is retracted therefrom, as illustrated in Frame 9. This action occurs concurrently with the lifting of the subsequent blank from the destacking arm 123 by the primary forming tool 127.
In Frame 10 the destacking arm 123 again rotates towards the leading blank in the magazine as the forming tool support member 142 moves the primary forming tool with the subsequent blank and the secondary forming tool with the open-mouthed container over the folding die 135 and the discharge conveyor 150, respectively. This step is essentially the fully-loaded view of the apparatus as shown earlier (in Frame 4).
Again, as the destacking aim 123 engages the leading blank in the magazine, the primary forming tool “stuffs” a blank into the folding die 135, commencing the folding step as before, and, as shown in Frame 11, the secondary forming tool 127 places the open-mouthed container onto the discharge conveyor 150. The pistons of the air cylinders 148 within the secondary forming tool 128 are withdrawn so that the spikes at the ends thereof disengage the material of the container. As the stuffing and folding of the subsequent container takes place, a new blank is grabbed by the suction cups 125 of the destacking arm 123. When the destacking arm carries the new blank towards the horizontal rest position, as shown in Frame 12, the primary and secondary tools are withdrawn from their respective partially formed and fully formed open-mouthed containers.
The containers thus formed are conveyed by the discharge conveyor 150 either to storage or, more conveniently, to a filling and sealing machine. The lid portions 10,11 remain standing substantially vertically throughout the forming process after the blank has been “stuffed” into the folding die. The tuck-in flaps 10B,11B protrude sidewardly from the first and second lid portions 10,11 as the container is discharged from the apparatus.
Referring now to
Ideally, lid closure and sealing is automated using well established techniques. Referring now to
It will be appreciated by the skilled addressee that machine forming of the blank facilitates fast and efficient forming of the open-mouthed containers for subsequent reception of materials. It will be further appreciated that by adapting the magazine, the folding tools and the folding die, other blanks which have been modified for machine folding may also be considered. For example and with reference to
It will be appreciated by the skilled addressee that the shrink-wrappable web material web may be substitute by different materials which can be bonded to secure the contents of the container therein. Materials having selectively applied adhesives or materials having characteristics which enable the free ends thereof to adhere to one another with sufficient strength to achieve the desired results (including in a manner akin to so-called “cling-films”) may also be used.
It will of course be understood that the invention is not limited to the specific details described herein, which are given by way of example only, and that various modifications and alterations are possible within the scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0421388.0 | Sep 2004 | GB | national |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/GB04/04935 | Nov 2004 | US |
| Child | 11728980 | Mar 2007 | US |
