Easy-cleavage shrink laminate film and the bag using the same

Details Easy-cleavage shrink laminate film and the bag using the same Easy-cleavage shrink laminate film and the bag using the same

1998-09-02

2001-04-24

Kiliman, Leszek (Department: 1773)

Stock material or miscellaneous articles

Composite

Of polyamide

C428S475800, C428S476100, C428S034300, C428S034900

Reexamination Certificate

active

06221502

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an easy-cleavage shrink laminate film and a bag using the same, which are easy to tear and are used for, for example, packaging foods, medicines, industrial materials, etc.
BACKGROUND OF THE INVENTION
Heretofore, in general, polyvinylidene chloride (PVDC) has been used as the material for wrapping and packaging hams, sausages, etc.
However, polyvinylidene chloride is problematic in that it produces chlorine gas when incinerated. With the recent increase in the awareness of environmental problems, it is much desired that conventional wrapping and packaging materials of chlorine resins are substituted with any others that are gentle to the environment.
Forming conventional wrapping and packaging materials into bags requires high-frequency sealing machines for high-temperature heat sealing.
To open them, bags of conventional wrapping and packaging materials are not easy to tear by hand.
A system of casing sausages is known, in which the cases formed are fixed with metal bands of aluminium or the like around their upper and lower sides. However, as having the metal bands, the cases are problematic in that they could not be applied to metal detectors for detecting impurities.
SUMMARY OF THE INVENTION
Given that situation, the present invention is to provide an easy-cleavage shrink laminate film which is harmless to the environment, which is easy to tear and which is moderately shrinkable, and to provide a bag using it.
Specifically, the invention provides an easy-cleavage shrink laminate film comprising an easy-cleavage shrink film and a sealant film as laminated on one or both surfaces of the easy-cleavage shrink film, in which the easy-cleavage shrink film comprises from 40 to 85 parts by weight of nylon 6 (Ny 6) and from 15 to 60 parts by weight of meta-xylylene adipamide (MXD 6) (provided that Ny 6+MXD 6=100 parts by weight), and has been drawn at an orientation ratio of not smaller than 2.8 times both in the MD direction (machine direction in which the film is moved during drawing) and in the TD direction (transverse direction, or that is, the widthwise direction of the film) and thermally fixed at a heat-treating temperature falling between 120 and 195° C. to thereby have a degree of shrinkage of from 15 to 40% when the film is put in hot water at 120° C. under pressure of about 2.0 kg/cm
2
for 20 minutes.
The invention also provides a bag using the easy-cleavage shrink laminate film.


REFERENCES:
patent: 5541011 (1996-07-01), Takashige et al.
patent: 5858550 (1999-01-01), Tsai
patent: 5874155 (1999-02-01), Gehrke
patent: 5925305 (1999-07-01), Takashige et al.
patent: 5935637 (1999-08-01), Gesse
patent: 0 903 220 A2 (1999-03-01), None

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