Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1992-06-19
1994-11-29
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
101 35, 427256, B29C 4900
Patent
active
053688082
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a manufacturing method for blowbag (flexible container) comprising a thermoplastic material and used for containing pharmaceuticals, foodstuffs, cosmetics and the like.
BACKGROUND ART
Flexible blowbottles comprising a thermoplastic material and used for containing pharmaceuticals, foodstuffs, cosmetics and the like have been widely known conventionally to the extent that no further description here is necessary.
In general, the body portion of such blowbottles deforms when a plate for printing is pressed to their surface due to their flexibility, it is extremely difficult to use direct printing to indicate the contents of the bottle and the like.
Therefore, the conventional method has been to apply a positive pressure to the inside of the bottle and to achieve a balance between the positive pressure and the printing pressure so that the shape of the bottle is maintained when direct printing is performed thereon.
However, as shown in FIG. 9, in the case of a blowbag, when the sectional shape of the body portion is flat, and when it is comprised of a thermoplastic material having a the ratio of bending elasticity of between 500-10000 kg/cm.sup.2, the application of a positive pressure to the inside of the blowbag flexibly deforms the body portion 1 of the blowbag when printing is performed to that surface using a transfer roller 7, and it is difficult to maintain the required shape of the blowbag. As a result, it is extremely difficult to balance the printing pressure and the positive pressure, slippage occurs when there is printing and it is extremely difficult to have suitable printing.
In light of these problems, the present invention has as an object the provision of a blowbag manufacturing method which supports the blowbag body portion by a pressing surface of a pressing jig, and which is in close contact with an opposing wall of a blowbag so that slippage during printing of this upper surface of a body portion in this status of close contact is completely prevented, and so that even in the case of a flexible blowbag comprising a thermoplastic material having a ratio of bending elasticity of between 500-10000 kg/cm.sup.2, it is possible for the body portion to have highly accurate printing by a transfer roller.
DISCLOSURE OF THE INVENTION
The blowbag manufacturing method of the present invention blowmolds a blowbag having a body portion with opposing walls which are flat in section and an opening portion connected to the body portion, and comprising a thermoplastic material having a ratio of bending elasticity of between 500-10000 kg/cm.sup.2, and flat surfaces of the blowmolded blowbag body portion are supported by a pressing surface of a pressing jig having an area smaller than the flat surfaces and so that the flat surfaces are in close contact, and required items are printed to an upper side wall surface of opposing walls of the body portion and which are in close contact with the pressing jig.
In addition, in the process of pressing the pressing jig, a frame member is provided from above, so as to correspond to a side surface of a pressing surface, and the required items are then printed onto the surface of the blowbag.
According to the blowbag manufacturing method of the present invention, a body portion of a blowbag comprising a thermoplastic material is supported and pressed by a pressing surface of a pressing jig having an area smaller than the flat surface, and in the process of pressing the pressing jig, a periphery of a body portion is pressed by a member corresponding to a side surface of a pressing surface from above and so opposing walls of a body portion are in a status of close contact. Then, when the blowbag is in such as status, required printing is performed to a body portion which is being held flat on a pressing surface of a pressing jig.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevation view of a pharmaceutical liquid container which is one example of a blowbag relating to the present invention;
FIG. 2 is a sec
REFERENCES:
patent: 2491947 (1949-12-01), Bardash
patent: 2601700 (1952-07-01), Pinsky et al.
patent: 2751841 (1956-06-01), Grape
patent: 3072969 (1963-01-01), DuBois
patent: 3286005 (1966-11-01), Cook
patent: 3608268 (1971-09-01), Lauritzen
patent: 3881410 (1975-05-01), Shenoha
patent: 4202663 (1980-05-01), Haigh
patent: 4880425 (1989-11-01), Kuhlemann et al.
Koike Yoshio
Matsumoto Kazuya
Saito Hisatoshi
Kewpie Kabushiku Kaisha
Kyoraku Co. Ltd.
Timm Catherine
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