US2008187256A1PendingUtilityA1

Method of forming composite seal structure of peel seal and tear seal

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Assignee: HISHINUMA KAZUOPriority: Feb 6, 2007Filed: Jun 15, 2007Published: Aug 7, 2008
Est. expiryFeb 6, 2027(~0.5 yrs left)· nominal 20-yr term from priority
Inventors:Kazuo Hishinuma
B29C 66/7212B29C 66/133B29C 66/9192B29C 65/38B29K 2995/0015B29L 2031/7128B65B 51/303B29C 66/91651B29C 65/18B29C 66/71B29C 66/431B29C 65/223B29C 66/24245B29C 66/91443B29C 66/91231B29L 2031/712B29L 2009/003B29C 65/76B29C 66/818B29C 65/8215B29C 66/80B29C 66/91951B29C 66/24221B29C 66/131B29C 66/1122B29C 66/949B29C 66/112B29C 66/919B29C 66/961B29C 66/3472B29C 66/91421B29C 65/224B29C 66/7352B29C 65/8223B29C 66/94B29C 66/232B29C 66/8322B29C 66/91212B29C 66/53461B29C 66/43B29C 66/962B65B 51/146B29C 66/81261B29C 66/81871B29C 65/8207
43
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Claims

Abstract

A method of forming a composite seal structure having great resistance to rupture, rare generation of pinholes is provided which comprises using a heat sealer having two blocks which presses sheets to be heat-sealed and at least one of which is a heating block provided with a seat which renders its surface at a temperature forming peel seal, on a part of its surface pressing the sheets, heating the heating block at a temperature forming tear seat, and pressing the sheets to form a heat seal having the composite seal structure of peel seal and tear seal.

Claims

exact text as granted — not AI-modified
1 . A method of forming a composite seal structure of peel seal and tear seal which comprises:
 using a heat sealer having two blocks which presses sheets to be heat-sealed and at least one of which is a heating block provided with a seat which renders its surface at a temperature forming peel seal, on a part of its surface pressing the sheets,   heating the heating block at a temperature forming tear seat, and   pressing the sheets to form a heat seal having the composite seal structure of peel seal and tear seal.   
     
     
         2 . The method of  claim 1 , wherein the peel seal has a width of 2 to 20 mm, the tear seal has a width of 1 to 10 mm, and the width ratio of peel seal/tear seal is 0.2 to 20. 
     
     
         3 . The method of  claim 2 , wherein the width ratio of peel seal/tear seal is 1 to 5.

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