Method of fabricating packs of self opening plastic bags
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B31B-003/62
B31B-027/62
B31B-003/98
출원번호
US-0237601
(1994-05-02)
발명자
/ 주소
Kemanjian Gary (1305 Daveric Dr. Pasadena CA 91107)
인용정보
피인용 횟수 :
7인용 특허 :
0
초록▼
Packs of T-shirt type plastic shopping bags are fabricated in such a manner that when the bags are mounted on conventional racks, as each bag is pulled off the rack, the front wall of the next ensuing bag is pulled out to open the bag for the depositing of articles to be packed in the bag. This is a
Packs of T-shirt type plastic shopping bags are fabricated in such a manner that when the bags are mounted on conventional racks, as each bag is pulled off the rack, the front wall of the next ensuing bag is pulled out to open the bag for the depositing of articles to be packed in the bag. This is accomplished by providing a special configuration for the central tab which is hooked on the upwardly extending element in the rack. The tab has a narrow neck which is partially slit between the neck edges and is adhered to the tabs of adjacent bags by an adhesive spot applied in hot melt condition below the slit. Thus, pulling of the rear wall of each bag first effects a rupture of the tab neck of the rear wall of the bag at the tab slit, while simultaneously rupturing the neck of the tab of the front wall of the next ensuing bag and pulling said front wall away from the rear wall of the latter bag, until, with further pulling, the adhered spots on the neck of the rear wall of the bag being pulled and on the neck of the front wall of the next ensuing bag, detach from each other. Such adherence is accomplished in the course of production of bag packs by a gun discharging a hot melt adhesive.
대표청구항▼
A method of producing a pack of coinciding pressed together T-shirt type plastic bags for dispensing from a rack when mounted thereon; said rack comprising a pair of parallel rods spaced from each other by a first predetermined distance, said rods being secured to project normally to a vertical plan
A method of producing a pack of coinciding pressed together T-shirt type plastic bags for dispensing from a rack when mounted thereon; said rack comprising a pair of parallel rods spaced from each other by a first predetermined distance, said rods being secured to project normally to a vertical plane and lying in a transverse horizontal plane; said rack further being provided with an element disposed equidistantly between said rods and projecting upwardly to a height below said horizontal plane, each of said bags being formed of a pair of abutting polyethylene front and rear sheets of a rectangular configuration, said sheets being sealed to each other along their sides and bottom edges and having a pair of handles spaced from each other by a distance in excess of said first predetermined distance and formed by a cut-out extending downwardly and inwardly of the side edges a second predetermined distance from the central portion of the upper edges of the sheet, said handles being sealed across their upper edges, the central area of the lower edge defining the cut-out of each sheet also defining an upwardly projecting tab, said tab comprising an upper expanded portion connected to the lower edge of the cut-out by a narrower neck portion; each of said handles being orificed at a predetermined point so that all of the orifices of the handles of the bags of the pack are in register, the predetermined points in the handles of each bag being spaced apart from each other by said first predetermined distance, the expanded portions of the tabs of each sheet having an inner transverse slot, and the neck portion of each tab being slit transversely between, but not extending to, the neck edges, the neck of the tab of the rear sheet of the first bag of the bag pack being lightly adhesively adhered to the neck of the forward sheet of the next ensuing bag of the pack at a point adjacent to, but below, the slits in the tab necks; said method comprising: (a) providing a roll of plastic tubing to provide when flattened pairs of coinciding plastic sheets; (b) at predetermined distances perforating the flattened tube transversely; (c) heat sealing the tube along a line adjacent and parallel to each side of the transverse perforation to form a tube closed at each end; (d) severing the flattened tube along each perforation to create a series of tubular bags sealed at both ends; (e) die cutting out from a preselected end of each bag a central portion from the edge of said end downwardly, to leave a pair of handles sealed at their upper ends, and upwardly from the lower edge of said cut-out central portion a tab for each sheet of the bag, said tabs comprising an upwardly extending expanded section connected by a narrow neck to the lower edge of its sheet, said expanded portion being slotted, and said neck having a transverse slit between, but not extending to, the edges of said neck; (f) applying a hot adhesive to a preselected spot adjacently below the transverse slit in the neck of the outside of one sheet; (g) immediately placing the bag, to the tab of which the adhesive has been applied, in registering and pressing contact with a second similarly formed bag so that the neck of the sheet forming in the second bag which is placed in contact with the neck of the sheet of the first bag, is adhered to, and (h) repeating the steps of (a) through (h) to produce a registering pack of preselected number of bags.
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이 특허를 인용한 특허 (7)
Huang Frank F. J. ; Huang Daniel C., Apparatus and method for forming aperture cutouts for a pack of self-opening plastic bags.
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