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1. 发明授权

US4655737A Method for preparing flat-bottom thermoplastic sack 失效
标题翻译：平底热塑性袋的制备方法
公开(公告)号：US4655737A
公开(公告)日：1987-04-07
申请号：US726570
申请日：1985-04-24
申请人： Gordon L. Benoit
发明人： Gordon L. Benoit
IPC分类号： B31B1/86 , B31B19/36 , B31B19/86 , B31B23/00 , B31B35/60 , B31B37/00 , B31B1/64
CPC分类号： B31B37/00 , B29C65/08 , B29L2031/7128 , B31B2219/2627 , B31B2219/269 , B31B2219/9093 , B31B2237/20 , B31B2237/60 , Y10S493/926
摘要： A method for preparing flat bottom thermoplastic sacks comprising process steps for forming a tube of thermoplastic film, collapsing said tube while forming two oppositely disposed gussets therein, forming two pairs of diagonal sealed seams in the gussets, forming two pairs of diagonal preweakened lines parallel to said diagonal seals, forming a transverse sealed seam across the tube along a line which includes the inboard ends of the diagonal seams and forming preweakened transverse lines closely adjacent and parallel to said transverse sealed seam or forming a severing line along this line, removing the four double triangular regions bounded by the diagonal preweakened lines, the transverse preweakened lines and the side edges of the tube and collecting the resulting structures either while still interconnected or stacking the severed structures and then removing the triangular regions. The final structure can have handles or it can be handleless.
摘要翻译：一种用于制备平底热塑性袋的方法，包括用于形成热塑性薄膜管的方法步骤，在形成两个相对设置的角撑板的同时将所述管塌缩，在角撑板中形成两对斜对角密封接缝，形成两对平行于所述对角密封件沿着包括对角线接缝的内侧端部的管线形成跨越管的横向密封接缝，并且形成与所述横向密封接缝紧密相邻并平行的预蚀造横向线，或沿着该线形成切断线，由对角线预制线，横向预制线和管的侧边界限定的双三角形区域，并收集所得结构，同时仍然互连或堆叠切断的结构，然后移除三角形区域。最后的结构可以有把手，也可以是无柄的。

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