The present invention relates to a method for producing glass bottles by automatic forming, and an apparatus for carrying out the method.
An object of the invention is to produce a glass bottle having a large mass relative to the bottle capacity while at the same time having a significant glass thickness at the shoulders, at the base and on the vertical faces.
Another object of the invention is to produce a bottle intended for the luxury perfume or any other perfume sector, or for the cosmetics or food sector.
Another object of the invention is to produce a bottle in which the ratio of its weight to its capacity is within the range of 3-6.
These objects are attained according to the invention by a method for producing glass bottles as described in claim 1.
The present invention is further clarified in terms of a preferred embodiment thereof, provided by way of non-limiting example with reference to the accompanying drawings, in which:
As can be seen from the figures, the method for producing the glass bottle requires the use of a preform mould indicated overall by 2, consisting of two half-shells 4, 4′ which are hinged together but are also able to undergo horizontal parallel movement, such that when closed together form a cavity 6 open upperly and lowerly.
The lower aperture of the two half-shells 4, 4′ is closable, during the glass preform formation step, by another collar 8, also composed of two halves, intended to give the final shape to the mouth, but not exclusively thereto, in which a lining 10 is positioned for guiding a movable plunger 12 housed within a guide accessory 13.
During the preform formation step, a funnel 14 can be inserted into the top of the cavity 6, and be closed by a stopper 16. The collar 8 is mounted on an arm 20 of a device 27 rotatable about a horizontal axis 22.
Said rotation device 27 transfers the glass preform, obtained in the first step of the production process, to the mould which gives the bottle its final shape. For this purpose a finishing mould 24 is provided (see
The cavity 28 is closed lowerly by a plug 30 forming the base of the finishing mould; the two half-shells 26, 26′ (forming part of the finishing mould) are subjected to hinge-type movement or parallel movement and, when closed, they form together with the parts 32 a hole of generally circular shape which supports the preform within the cavity 28 when the preform is released by the collar 8.
In particular, by this method, the hole within the mouth is obtained with dimensional and tolerance characteristics such as not to require any subsequent sizing work with machine tools.
A blowing head 36 housing a pipe 38 used during the bottle forming step is positioned above the finishing mould.
In detail, the bottle is produced by the following procedure: with the half-shells 4, 4′ in mutual contact, a glass gob 40 (for example, but not exclusively, of soda-lime glass) is introduced at a temperature of 1100° C.-1250° C. into the cavity 6. In particular,
After loading the gob into the preform mould from above, a gob compression step is carried out by means of compressed air in a downward direction. During this step the glass, still in a soft condition, assumes the external profile of the mould cavity, to form the mouth in both its final outer and inner shape. During this step the plunger mechanism and its accessories are in the high position (see
The specific use of the plunger and its accessories enable a container preform to be obtained during the first forming step having a large thickness at the shoulder.
The two half-shells 4, 4′ are opened and the collar 8 with the bottle constrained to it is then rotated through 180° by the device 27 about the axis 22, such as to position the formed bottle between the two half-shells 26, 26′ (open in this configuration) of the finishing mould 24.
The two half-shells are then brought into mutual contact such that the upper horizontal projections 32 retain the bottle neck. The blowing head 36 is then lowered such that a pipe portion 38, rigid with it, enables compressed air to be injected into the cavity 42 formed within the vitreous mass, in order to further inflate it and cause the vitreous mass to adhere to the walls of the half-shells of the finishing mould. On termination of this operation, the blowing head is removed, then after opening the two half-shells, the bottle, representing the product to be obtained, is extracted by suitable tweezers 50.
From the aforegoing it is apparent that the process according to the invention presents numerous advantages and in particular:
Moreover this type of process, described for production using a single gob during the production step, is also applicable if the said automatic machine is fed in parallel with two, three or four gobs. The process can hence be applied to forming machines having any distance between the cavity axes.
Number | Date | Country | Kind |
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UB2015A005129 | Oct 2015 | IT | national |
Filing Document | Filing Date | Country | Kind |
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PCT/IB2016/056208 | 10/17/2016 | WO | 00 |