Zipper and the packaging therewith

Details Zipper and the packaging therewith Zipper and the packaging therewith

2007-07-24

2007-07-24

Lavinder, Jack W. (Department: 3677)

Buckles, buttons, clasps, etc.

Zipper or required component thereof

Having interlocking surface with continuous cross section

C383S063000

Reexamination Certificate

active

11087872

ABSTRACT:
[PROBLEM] To provide a interlocking device and a packaging bag therewith wherein the interlocking device has sufficient heat stability against retort sterilization treatment and deformational change after said treatment small enough not to be impaired its reopenability.[SOLUTION MEANS] A interlocking device having a pair of male and female profiles wherein:said male and female profiles have non-heat-sealing part to bag body and heat-sealing part to bag body; wheresaid non-heat-sealing part consists of polypropylene type resin composition (A) having main melting peak temperature observed by differential scanning calorimetry less than 150 degree C. and the melt flow rate at 230 degree C. from 0.5 g/10 min to 20 g/10 min; andsaid heat-sealing part consists of polypropylene type resin composition (B) having main melting peak temperature observed by DSC, not less than 140 degree C. and the melt flow rate at 230 degree C. from 0.1 g/10 min to 20 g/10 min; andthe main melting peak temperature of polypropylene type resin composition (B) is at least 10 degree C. lower than that of polypropylene type resin composition (A), and a packaging bag with interlocking device wherein the aforesaid interlocking device is heat-sealed to the bag body via said heat sealing part.

REFERENCES:
patent: 5655273 (1997-08-01), Tomic et al.
patent: H06-37097 (1994-05-01), None
patent: H07-257602 (1995-10-01), None
patent: H09-066947 (1997-03-01), None
patent: H10-297652 (1998-11-01), None
patent: H10-297653 (1998-11-01), None

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