Claims
- 1. In a process for forming a thermoplastic film sack comprising:
- (a) forming two oppositely disposed gussets in a thermoplastic tube,
- (b) collapsing said tube,
- (c) sealing one end of said tube transverse to said gussets, and
- (d) removing an end region of the sealed end of said tube so as to form an open mouth portion and integral handles;
- the improvement comprising, a bottom seal transverse to said gussets, removing the film area below a curve extending from a point at the bottom of the four film layers of each gusset region to a point at the bottom of the two film layers of said sack so as to provide a plurality relief regions therein.
- 2. The process of claim 1 wherein said film area is removed prior to the formation of said bottom seal.
- 3. The process of claim 1 wherein said film area is removed after the formation of said bottom seal.
Parent Case Info
This is a division of copending application Ser. No. 584,836, filed Feb. 29, 1984.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3485437 |
Gruentzel et al. |
Dec 1969 |
|
4165832 |
Kuklies et al. |
Aug 1979 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
1231686 |
May 1971 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
584836 |
Feb 1984 |
|