Patent Application
20140360904
This application claims priority under 35 U.S.C §119 to Japanese Patent Application No. 2013-122639, filed Jun. 11, 2013 and Japanese Patent Application No. 2014-115485, filed Jun. 4, 2014. Each of the above applications are hereby expressly incorporated by reference, in its entirety, into the present application.
1. Field of the Invention
The present invention relates to a bundled object that is made by bundling a body-to-be-bundled which is made by overlapping a plurality of articles, with a plastic tape.
Further, the present invention relates to a bundling method and a bundling apparatus for manufacturing the bundled object as described above.
2. Description of the Related Art
In the past, in order to transport, store, or the like, articles having a relatively flat shape, overlapping a plurality of articles and then bundling the articles with a tape or a string has been widely performed. In a bundled object which is formed in this way, for example, in a case where the bundled object is discarded as it is, a case where consideration is required for releasing the bundling is less common. However, under other situations, it is sometimes required that the bundling be easily released.
As a concrete situation where there is a demand as described above, a case where an article is an analysis element (generally referred to as a slide, a cartridge, a card, a medium, or the like) that is used for some sort of analysis or inspection before the articles are loaded into an analyzer or the like, the articles are handled in the form of a bundled object in which a plurality of articles are put together and if the bundled object is loaded into the analyzer or the like, the articles are made to be able to be used one by one by cutting a tape or the like for the bundling, or the like can be given. In such a case, it is also required that the cut tape, string, or the like can be easily removed from the periphery of the plurality of articles.
As a bundled object made such that work to cut a tape, a string, or the like for bundling and then remove it from the periphery of a plurality of articles, as described above, is easily performed, a bundled object described in JP1987-4088A (JP-S62-4088A) or JP2002-211633A is publicly known.
The bundled object described in JP1987-4088A (JP-S62-4088A) is a bundled object made by forming a stack by overlapping copy sheets (copying paper) as articles, winding and bundling the stack by hard paperboard and a flexible packaging band, and then joining one end and the other end of the packaging band so as to be able to be torn off on the side surface of the stack.
Further, the bundled object described in JP2002-211633A is a bundled object made by forming a laminated body by stacking up prepackaged spoons as articles in multiple stages, winding and bundling the laminated body by a band film, and welding a rear end portion and a leading end portion of the band film so as to be able to be torn off on the side surface of the laminated body.
In the bundled object described in JP1987-4088A (JP-S62-4088A), one end and the other end of the packaging band are joined to each other so as to be able to be easily torn off, and thus releasing the bundling is simple, whereas a possibility that during transport or the like, the joining may come off, whereby the bundling may be loosened is recognized. Further, also in the bundled object described in JP2002-211633A, releasing the bundling is simple, whereas it is difficult to say that a plurality of articles can be sufficiently strongly bundled.
The present invention has been made in view of the above-described circumstances and has an object to provide a bundled object in which a plurality of overlapped articles is sufficiently strongly bundled and on the other hand, it is also easy to release the bundling.
Further, the present invention has an object to provide a bundling method and a bundling apparatus in which it is possible to manufacture the bundled object as described above.
According to an aspect of the present invention, there is provided a bundled object including:
In addition, in the bundled object according to the present invention having the above-described configuration,
Further, it is preferable that the plastic tape configuring the bundled object according to the present invention be a tape made of at least one of polyethylene and polypropylene.
On the other hand, according to another aspect of the present invention, there is provided a bundling method for manufacturing the bundled object according to the present invention described above, including:
In the bundling method according to the present invention, more preferably,
In addition, in the bundling method according to the present invention having the above-described configuration, it is preferable that tensile stress be made to act on the plastic tape in order to tighten the body-to-be-bundled and that a magnitude of the stress be set to be in a range of 40% to 99%, and more preferably, a range of 50% to 80% of stress in which the plastic tape starts plastic deformation.
Further, in the bundling method according to the present invention having the above-described configuration, it is preferable that the welding be performed by using a heat block in which convex portions for heating in which a tip surface coming into contact with the plastic tape in order to weld the plastic tapes to each other has a rectangular shape and one side of the rectangular shape is set to be parallel to a width direction of the plastic tape are disposed in a plurality at intervals from each other in the width direction of the plastic tape.
In a case of doing so, it is preferable that a heat block in which an area ratio of the convex portion for heating against the total area of the convex portion for heating and one space between the convex portion for heating wherein the space adjacent to the convex portion for heating, is in a range of 20% to 70%, and more preferably, a range of 30% to 50% be used for the heat block.
Further, in the bundling method according to the present invention having the above-described configuration, it is preferable that in a step of bringing an upper end of the body-to-be-bundled moving upward, into contact with the up-and-down position defining unit,
Further, according to still another aspect of the present invention, there is provided a bundling apparatus for manufacturing the bundled object according to the present invention described above, including:
The bundling apparatus according to the present invention more preferably further include a tape fixing section which fixes the plastic tape farther on the storage unit side than a place on which the body-to-be-bundled is placed,
In addition, it is preferable that the tape tightening unit make tensile stress act on the plastic tape in order to tighten the body-to-be-bundled and that the stress be set to be in a range of 40% to 99%, and more preferably, a range of 50% to 80% of stress in which the plastic tape starts plastic deformation.
Further, it is preferable that the welding unit be a heat block in which convex portions for heating in which a tip surface coming into contact with the plastic tape has a rectangular shape and one side of the rectangular shape is set to be parallel to a width direction of the plastic tape are disposed in a plurality at intervals from each other in the width direction of the plastic tape.
Then, it is preferable that such a heat block be a heat block in which an area ratio of the convex portion for heating against the total area of the convex portion for heating, and one space between the convex portion for heating wherein the space is adjacent to the convex portion for heating, is in a range of 20% to 70%, and more preferably a range of 30% to 50%.
Further, it is preferable that the up-and-down position defining unit have a lower surface which comes into contact with the body-to-be-bundled and
In the bundled object according to the present invention, both end portions of the plastic tape are in a state of extending farther to the outside in a tape length direction than the welded portions, and thus it is possible to release the bundling by tearing the plastic tape at the plurality of welded portions and non-welded portions adjacent thereto by pulling both end portions.
Then, in the bundled object according to the present invention, both end portions other than a portion of the plastic tape winding around the body-to-be-bundled are overlapped on each other at a position away from the body-to-be-bundled and close to one of the four marginal portions of the body-to-be-bundled, and at the overlapped portions, both end portions of the plastic tape are welded to each other at a plurality of places arranged at intervals from each other in the tape wide direction, and therefore, at the time of the welding of the plastic tapes, the portion of the plastic tape wound around the body-to-be-bundled is prevented from being heated. Therefore, since the bundling is prevented from being weakened due to stretching of the plastic tape of the portion by heating, the bundled object according to the present invention can be strongly bundled.
Further, in the bundled object according to the present invention, both end portions of the plastic tape are welded to each other at a position close to one marginal portion of the body-to-be-bundled, and thus an effect is exhibited in that it becomes possible to easily release the bundling by making a force to tear the welded portions and the non-welded portions adjacent thereto of the plastic tape efficiently act on the welded portions and the non-welded portions when releasing the bundling, as will be described in detail with reference to an embodiment later.
This effect is obtained by using the marginal portion of the body-to-be-bundled biting the plastic tape, as will be described in detail later, and it becomes unnecessary to set the welding strength (joint strength) of the welded portion to be particularly low for easier release of the bundling. Accordingly, in the bundled object according to the present invention, it is possible to set the welding strength of the welded portion to be sufficiently high, and thus also in this regard, the bundled object according to the present invention can be strongly bundled.
In addition, in the bundled object according to the present invention, it is possible to make tensile stress act on the plastic tape in order to tighten the body-to-be-bundled and to set the welding strength of the welded portion to be sufficiently high, and thus it also becomes possible to prevent the bundling from being released during the transport or the like of the bundled object.
On the other hand, as described above, the bundling method according to the present invention, it becomes possible to manufacture the bundled object according to the present invention described above.
Further, as described above, the bundling apparatus according to the present invention, it becomes possible to manufacture the bundled object according to the present invention described above.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In this embodiment, the article 2 is a slide for biochemical analysis (hereinafter referred to simply as a slide 2) as an example. The slide 2 of this example is an object made by supporting a reagent or the like for specimen analysis on, for example, a thin and substantially rectangular-shaped plastic substrate. Then, the slides 2 are made so as to be loaded into an analyzer (not shown) in a state where a plurality of slides 2 are overlapped, and for this reason, the slides 2 are handled in the state of the laminated body 3 in which a plurality of slides 2 are put together. If the laminated body 3 is configured by laminating a plurality of slides 2 each made of a substrate having the above-described shape, the laminated body 3 has a substantially rectangular parallelepiped shape having four marginal portions 3a. Each of the marginal portions 3a is parallel to a direction (a direction of an arrow X) orthogonal to a direction (a direction of an arrow Z) in which the slides 2 are overlapped.
On the other hand, the plastic tape 4 for bundling is a tape obtained by cutting a thin sheet material made of, for example, high-density polyethylene, into a tape shape having a predetermined width. If a heating member is pressed in a state where two plastic tapes 4 are overlapped, as will be described later, heated and pressed portions are welded to each other. In addition, an appropriate temperature of the heating member for welding will be described in detail later.
The plastic tape 4 bundles the laminated body 3 by winding around the laminated body 3 once so as to pass over the four marginal portions 3a of the laminated body 3. Describing in more detail, the plastic tape 4 is made longer than a length corresponding to one round of the laminated body 3 as a whole, and thus, in addition to a portion winding around the laminated body 3, both end portions 4a and 4b having some degree of length are left as overlapped portions. That is, both ends of the plastic tape are in a state of being away from the laminated body 3 that is a body-to-be-bundled. Then, both end portions 4a and 4b of the tape are away from the laminated body 3 and are overlapped on each other from the position of one marginal portion 3a, and the overlapped portions (superimposed portions) are welded to each other at a position close to one marginal portion 3a, that is, at end portions on the laminated body 3 side. In
Both end portions 4a and 4b of the plastic tape 4 extend as pull tape portions for pulling (described later) farther to the outside in a tape length direction (the side away from the laminated body 3) than the welded portions H. In addition, in this example, a plurality of welded portions G similar to the welded portions H are formed farther to the outside in the tape length direction than the welded portions H. The welded portions G are formed in order to put both end portions 4a and 4b of the plastic tape 4 together and easily hold the portions and may be omitted as appropriate. Further, both end portions 4a and 4b of the plastic tape 4 may be cut at a position just outside of the welded portions in addition to being left slightly long outside the welded portions as shown in the drawing.
When releasing the bundling of the bundled object 1 formed as described above, the laminated body 3 is retained in, for example, a given holder 5 or the like, as shown in
Then, from this state, both end portions 4a and 4b as the pull tape portions of the plastic tape 4 are gripped by the fingers of a worker and pulled in a direction of an arrow P with a force strong to some extent. In addition, the pulling direction is, as an example, a direction approximately parallel to the upper surface of the laminated body 3 (that is, the upper surface of the slide 2 stacked at the top), a direction approximately orthogonal to the upper surface, or a direction deviated by an angle of the extent less than or equal to ±30° with respect to these directions.
If both end portions 4a and 4b of the plastic tape 4 are pulled in the direction approximately parallel to the upper surface of the laminated body 3, as shown in
Note that, the direction of pulling both end portions 4a and 4b of the plastic tape 4 may be a direction that is approximately orthogonal to the upper surface of the laminated body 3 and is an upward direction in the plane of paper, or a direction deviated by an angle to the extent less than or equal to ±30° with respect to the directions. In this case, it is necessary to restrict movement by some means such that the laminated body does not move in the upward direction in the plane of paper. For example, a weight may be placed on the laminated body, or the laminated body may be pressed down by the human hand. In such a case, a cutting state of the plastic tape 4 generally becomes a state as shown in
Here, in
In the holder 6, the bundled object 1 is retained upside down compared to the case of
Next, a bundling method for manufacturing the bundled object 1 described above will be described.
As shown in the drawing, the bundling apparatus has a tape supply roll 10 which is a storage unit for winding and storing the plastic tape 4 which has been elongated, a delivery clamp 11 which grips a leading end portion of the plastic tape 4 drawn from the tape supply roll 10, by a pair of upper and lower clamp pieces 11a and 11b, a tape cutter 12 which is configured by an upper blade 12a and a lower blade 12b, and a transport clamp 13 which grips the leading end portion of the plastic tape 4 by a pair of upper and lower clamp pieces 13a and 13b. In addition, in
The clamp pieces 11a and 11b of the delivery clamp 11 are made such that each of the clamp pieces 11a and 11b can move in an up-and-down direction, that is, the ±Z direction, and move in a direction approaching each other, thereby entering a state of coming into contact with each other with the plastic tape 4 interposed therebetween, and thus gripping the leading end portion of the plastic tape 4, and move in a direction away from each other from there, thereby releasing the leading end portion of the plastic tape 4. The upper blade 12a and the lower blade 12b of the tape cutter 12 are also made such that each the upper blade 12a and the lower blade 12b can move in the up-and-down direction, that is, the ±Z direction, and move in a direction approaching each other, thereby sandwiching the leading end portion of the plastic tape 4 therebetween from the top and the bottom and then cutting the leading end portion of the plastic tape 4.
The clamp pieces 13a and 13b of the transport clamp 13 are also made such that each of the clamp pieces 13a and 13b can move in the up-and-down direction, that is, the ±Z direction, and move in a direction approaching each other, thereby entering a state of coming into contact with each other with the plastic tape 4 interposed therebetween, and thus gripping the leading end portion of the plastic tape 4, and move in a direction away from each other from there, thereby releasing the leading end portion of the plastic tape 4. Then, the transport clamp 13 is made so as to be able to move in the ±Z direction and a ±Y direction in a state of gripping the leading end portion of the plastic tape 4 and configures a tape drawing unit, a tape putting-over unit, a tape moving unit, and a tape tightening unit in the bundling apparatus according to the present invention.
The bundling apparatus further has a slide set holder 14, a heat block 15 as a welding unit made so as to be able to move in the ±Z direction, a set guide 16 as an up-and-down position defining unit made so as to be able to move in the ±Z direction and a ±X direction, and a slide supply unit 17 as a body-to-be-bundled supply unit made so as to be able to move in the ±Z direction.
As shown in
The heat block 15 has, at a bottom portion thereof, a plurality of convex portions 15a which are arranged in a row in the X direction at intervals from each other (refer to
Further, it is preferable that the heat block 15 be provided with the comb tooth-like convex portions for heating 15a each having a rectangular tip surface (refer to
The Two set guides 16 are disposed to be separated from each other in the width direction of the plastic tape 4 (the X direction). An upper portion of each set guide 16 is formed so as to have an L-shaped cross-section, and the respective set guides 16 are disposed on both sides of the slide placement section 25 (the front side and the back side in
Hereinafter, a bundling method using this apparatus will be described. In a case of performing bundling, first, the transport clamp 13 moves in the −Z direction and the −Y direction from a standby position shown in
If the transport clamp 13 advances to a predetermined position in the Y direction, the transport clamp 13 stops at the predetermined position. Subsequently, the delivery clamp 11 acting as a tape fixing unit enters a state of gripping and fixing the plastic tape 4 again and the transport clamp 13 moves by a predetermined distance in the −Y direction. In this way, the plastic tape 4 is placed on the slide placement table 20 in a sufficiently slack state.
Next, after the slide supply unit 17 in which a predetermined number (a plurality) of slides 2 are retained descends, the slide supply unit 17 stops at a position close to the upper ends of the four slide holding frames 21 and releases the retention of the plurality of slides 2 retained therein. Therefore, the slides 2 are placed on the slide placement table 20 with the plastic tape 4 interposed therebetween and stacked up inside the four slide holding frames 21 (in the slide placement section 25 shown in
Next, the two set guides 16 move in a direction approaching each other and stops at an interval of about the tape width. In this way, a horizontal portion of each upper end of the set guides 16 enters a state of being located above a side portion of the laminated body 3. Thereafter, the set guides 16 descend by a predetermined length together, whereby a state is created where each of the lower surfaces of the horizontal portion is nearly aligned with the upper surface of the holder side plate 22. In other words, the lower surfaces of the horizontal portions of the set guides 16 are located on the same plane as the upper surface of the holder side plate 22.
Next, the transport clamp 13 moves by a predetermined distance in the −Y direction and enters a state where a portion of the plastic tape 4 winds around the laminated body 3 once, as shown in
Next, the transport clamp 13 descends by a predetermined distance, thereby entering a state shown in
Next, the heat block 15 descends from a standby position and the plurality of heated convex portions 15a thereof are pressed onto the two overlapped plastic tapes 4. At this time, the pressing positions of the plurality of convex portions 15a are positions out of the laminated body 3 near one marginal portion 3a (refer to
Next, the upper blade 12a and the lower blade 12b of the tape cutter 12 that is a tape cutting unit are operated, whereby the plastic tape 4 is cut at a place farther on the leading end side to some extent than a portion gripped by the delivery clamp 11. A state at this time is shown in
In the method described above, when moving the transport clamp 13 to the position shown in
Further, as can be seen from
Further, since the welding of the plastic tape 4 winding around the laminated body 3 is performed on the holder side plate 22 out of the laminated body 3, it becomes possible to perform the welding without basically transferring heat for welding to the slides 2. Therefore, it is possible to prevent a situation where the slides 2 are damaged by heat.
Further, as described above with reference to
In addition, since the heat block 15 (refer to
In addition, in the method described above, the welded portions G shown in
Further, as means for defining the positions of the plurality of slides 2 laminated, in addition to the holder side plate 22 and the set guide 16 described above, it is also possible to use a single holder jig 30 having a shape as shown in
Further, as the plastic tape 4, it is not limited to a tape made of high-density polyethylene described above, and besides, as long as it is a thermally weldable tape such as a tape made of normal polyethylene or a tape made of polypropylene, for example, a tape made of any plastic is also basically applicable.
Here, the plastic tape 4 being able to be particularly easily cut in the bundled object 1 according to the present invention will be described with reference to
The fact that even if from this state, both end portions 4a and 4b are pulled in a direction as shown in
In contrast,
Further, the extent that the marginal portions 3a1 and 3a4 of the laminated body 3 bite the plastic tape 4 also becomes smaller than in the case of the bundled object according to the present invention described above. For this reason, a force to pull both end portions 4a and 4b of the plastic tape 4 is prone to act so as to stretch the plastic tape 4 between the marginal portions 3a1 and 3a2 and likewise between the marginal portions 3a3 and 3a4. Accordingly, also in this regard, it is necessary to further increase the pulling force in order to cut the plastic tape 4.
In addition, it is also possible to pull both end portions 4a and 4b of the plastic tape 4 in the same direction as the direction of the arrow P of
Next, a preferable range of a force to bundle the laminated body 3 will be described. Here, with respect to the tensile strength of the plastic tape 4, what extent is preferable to be selected as a bundling force of a ratio was determined by experiment. In addition, the “tensile strength” of the plastic tape 4 which is dealt with here is defined by the lowest tensile stress in which the elasticity thereof is lost, that is, stress in which the plastic tape 4 starts plastic deformation if the plastic tape 4 is pulled with a further force. The reason for focusing on the elasticity of the plastic tape 4 is because, in order to strongly bundle the laminated body 3 composed of a plurality of articles laminated, it becomes essential to elastically bundle the laminated body 3 with the tape 4.
a. Test Conditions
In the experiment, the bundling strength was evaluated with the bundled object 1 as a target, in which the laminated body 3 made by overlapping twelve of the above-described slides for biochemical analysis was bundled with the plastic tape 4. A material of a portion to be bundled of the slide for biochemical analysis is thermoplastic resin, and the weight thereof is 10 g and the size is 28 mm lengthwise×24 mm crosswise×22 mm thick. On the other hand, as the plastic tape 4, tapes were obtained by cutting high-density polyethylene (HDPE) tapes having thicknesses of 20 μm and 30 μm to respectively have widths of 15 mm.
The laminated body 3 made by overlapping the twelve slides was wound with the plastic tape 4 in a slide lateral direction and a thickness direction and the plastic tapes 4 were welded to each other in a state where tension (tensile stress) was applied thereto. A state at this time is schematically shown in
b. Evaluation Methods
Evaluation was performed by the following two methods.
[Evaluation Method 1] The bundled object 1 immediately after the bundling was lightly gripped by making the thumb and the index finger rest on the portion of the plastic tape 4, as shown in
[Evaluation Method 2] The bundled object 1 was dropped onto a flat table from a height of 200 mm, and thereafter, the bundled object 1 was lightly gripped similar to Evaluation Method 1 described above, and then whether or not the slides fall out was confirmed.
c. Evaluation Results
The evaluation results by the two evaluation methods described above are shown in Tables 1 and 2 below.
As shown in Tables 1 and 2, in the bundled object 1 fabricated with a plastic tape tensile stress force at the time of welding set to be 10% of stress in which the tape starts plastic deformation, it was found that if the bundled object 1 was dropped, the plastic tape was loosened, and thus the bundling was easily released. In contrast, in the bundled objects 1 fabricated with a plastic tape tensile stress at the time of welding set to be 50% and 80% of stress in which the tape starts plastic deformation, it was confirmed that even if the bundled objects 1 were dropped, the bundling was not released.
From the above results, it can be said that in a case where the plastic tapes are welded to each other by the heat block 15 having the comb tooth-like convex portions 15a as shown in
<<Preferable Range of Convex Portion Area Ratio>>
In a case where the plastic tapes are welded to each other by the heat block 15 having the comb tooth-like convex portions 15a as described above, bundling strength also depends on the convex portion area ratio described above. The results of the experiment of investigating in detail a preferable range of the convex portion area will be described below.
a. Test Conditions
The bundling strength was evaluated with the bundled object 1 as a target in which the laminated body 3 made by overlapping twelve of the same slides for biochemical analysis as that used in the above-described experiment was bundled with the plastic tape 4. As the plastic tape 4, a tape obtained by cutting a high-density polyethylene (HDPE) tape having thicknesses of 20 μm to have a width of 15 mm was used.
The laminated body 3 made by overlapping the twelve slides was wound with the plastic tape 4 in a slide lateral direction and a thickness direction and the plastic tapes 4 were welded to each other in a state where tension (tensile stress) was applied thereto by using the device shown in
Usually, the tip surface of the convex portion for heating 15a, that is, the surface which comes into contact with the plastic tape 4 has an approximately rectangular shape (includes a square shape), one side of which is parallel to the width direction of the plastic tape 4, and also in this experiment, the heat block 15 having the convex portions for heating 15a of such a shape was used. Then, in this experiment, the heat blocks 15 of types A, B, C, and D having shapes shown approximately in
More specifically, the lengths in the plastic tape width direction of the convex portions 15a in the heat blocks 15 of the types A, B, C, and D are 0.9 mm, 1.5 mm, 2.4 mm, and 15 mm, respectively. Then, the length of the convex portion 15a in a direction orthogonal to the plastic tape width direction is 1.5 mm which is common to all the types. Further, the setting temperature of the heat block 15 was set to be six temperatures, 160° C., 165° C., 170° C., 175° C., 180° C., and 185° C. and welding time was set to be 1.5 seconds.
b. Evaluation Method
The evaluation was performed by Evaluation Method 2 described above. That is, the bundled object 1 was dropped onto a flat table from a height of 200 mm, then, the bundled object 1 was lightly gripped by making the thumb and the index finger rest on the portion of the plastic tape 4, as shown in
c. Evaluation Results
The evaluation results are shown in Table 3 below.
As shown in Table 3, in order to secure a sufficient bundling force, it is preferable to set the convex portion area ratio of the heat block 15 to be 30% and 50%, and if the convex portion area ratio is set to be 80%, when the bundled object 1 is dropped, the bundling is easily released, and if the convex portion area ratio is set to be 100%, the bundling itself becomes impossible.
From the above results, it can be said that in a case where the plastic tapes are welded to each other by using the heat block 15 having the comb tooth-like convex portions 15a as shown in
In addition, the convex portion area ratio of the heat block 15 as described above basically directly becomes the ratio of the welded portion in the bundled object fabricated by using the heat block 15 to the total area of the welded portion and the non-welded portion between the welded portions. Therefore, the shape of the welded portion becomes a rectangular shape, one side of which is parallel to the width direction of the plastic tape, similar to the shape of the tip surface of the convex portion of the heat block 15. Further, the area of the non-welded portion refers to the area of a rectangular portion which is present between the two welded portions and in which a dimension thereof in the length direction of the plastic tape is set to be the same as that of the welded portion.
Here, the reason that bundling becomes impossible in the heat block 15 of the type D described above, will be described. In a case where the laminated body 3 is bundled with the plastic tape 4 by using the device as shown in
In contrast, the heat blocks 15 of the types A, B, and C can prevent the stretching of the welded portion described above. In the plastic tapes 4 welded by the heat blocks 15, a plurality of welded portions H are arranged at intervals (the non-welded portions) from each other in the tape width direction, as shown in
In addition, strictly speaking, also in cases of using the heat blocks 15 of the types A, B, and C, in the non-welded portion of the plastic tape 4, some stretching sometimes occurs under a thermal effect of the welded portion H adjacent thereto. The heat block 15 of particularly the type C among these performs welding with the ratio of the non-welded portion to the welded portion H being smaller, compared to the heat blocks 15 of the types A and B. Therefore, in a case of using the heat block 15 of the type C, stretching becomes significant as the width of the non-welded portion is smaller, and thus, although it is not so much that the body-to-be-bundled falls out, but the bundling force becomes weaker. Therefore, if a dropping test as in Evaluation Method 2 described above, or the like is performed, stretching easily occurs in the plastic tape 4, thereby resulting in no dropping-resistance.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2013-122639 | Jun 2013 | JP | national |
| 2014-115485 | Jun 2014 | JP | national |
