Stock material or miscellaneous articles – Structurally defined web or sheet – Nonplanar uniform thickness material
Patent
1996-04-10
1998-10-20
Loney, Donald
Stock material or miscellaneous articles
Structurally defined web or sheet
Nonplanar uniform thickness material
428166, 156292, 1563084, 156553, B32B 328, B32B 3100
Patent
active
058243925
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of producing an air cushion using air as a cushion, an apparatus for the same and the air cushion and, more particularly, to the method of producing the air cushion of a bubble type, formed by blowing air into a plastic-film tube, the apparatus for the same and the air cushion.
BACKGROUND ART
Conventionally, when the object required should avoid having damage in packing, for example, electrical equipment, equipment for office automation, a precision instrument and a work of art, is packed, a cushion has been stuffed in a packing box for the intention to protect the packed object from receiving damage in transit.
The aforementioned cushion material, foam plastic block and so on have been used for a long time.
However, lately, in view of the environmental problems, other cushion materials have been required instead of the foam plastic block which is difficult to dispose of.
Answering this requirement, an air cushion using air as a cushion, more particularly, the air cushion of a bubble type which is formed by blowing air into a plastic-film bubble has been used.
As the above air cushion, a pillow bubble type having an almost tube bubble, a tetrahedral bubble type having a regular tetrahedral bubble or the like is used.
In the production of the aforementioned air cushion of the bubble type, an automatic cushion-bubble production apparatus and so on are developed for a small bubble, in which small bubbles are formed to simultaneously blow air and seal because of its simple structure.
The following are known as the aforementioned art: a two-ply film is sent to a first roller to seat in a longitudinal direction, expanded into a tube shape by air blowing, sent to a second roller to seal in a direction transverse to the longitudinal direction, and finally, formed into plural bubbles divided by sealing in a lengthwise and transverse grid. formed bubbles divided in the grid by sealing with a double stage roll. sealing in a double stage with a stamping type instead of the roll type in divided in the grid are formed, in which a seal is formed to extend even in the direction transverse to the longitudinal direction in the first stage seal of the stamping type. And further, the bubble is extended by feeding with air through a non-sealing portion in the direction transverse to the longitudinal direction to each division, and in the end, closing the non-sealing portion. the first stage in the film longitudinal direction (a sending direction), expanded by blowing air, and sealing at the second stage in the direction transverse of the film (a direction transverse to the longitudinal direction), whereby independent air bubbles are formed. to extend in the longitudinal direction, and the middle part of the tube is sealed by the direction transverse to the longitudinal direction seal to form the independent air bubbles. This method is commonly well-known. There is no disadvantage when the relatively small tetragonal bubble is formed. the film at the first stage (a heat-sealer 8), blow air into the film forming the tube, form the longitudinal direction seal for the width of each bubble line at the middle part in the film direction transverse to the longitudinal direction and also the direction transverse to the longitudinal direction seal having an unsealed intermission portion (a 15 type), and further seal the unsealed intermission portion of the direction transverse to the longitudinal direction seal at the third stage (a heat-sealer 16). Therefore, the seal strength in the direction transverse to the longitudinal direction is increased by the double stage seal which has an air-blowing passage which is limited in the second stage and then longitudinal direction is sealed after air is fed into the film sealed in a disadvantage in which reliable bubbles can not be produced, more specifically, the need of a process, which the direction transverse to the longitudinal direction seal divides at the middle of the shaped tube expanded by air in the sending direction, cause
REFERENCES:
patent: 3756884 (1973-09-01), Hagino
patent: 4287250 (1981-09-01), Rudy
patent: 4847126 (1989-07-01), Yanashiro et al.
patent: 5143775 (1992-09-01), Olsson et al.
P. 1 of European Patent No. EP 399 965 A3, dated Nov. 28, 1990, containing an English language abstract thereon; and a copy of the European Search Report attached thereto (2 pages).
English language abstract of Japanese Patent Application No. 5-4660, dated Jan. 14, 1993 (1 page).
Gotoh Shuichi
Yamashita Yukio
Idemitsu Petrochemical Co. Ltd.
Loney Donald
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