JP3049101B2 - Composite film for deep drawing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composite film,
In particular, after filling the bottom material container obtained by deep drawing with irregular shaped meat processing products such as handmade ham, the steam is blown from the outside to shrink the bottom material container and the adhesion with the filled contents is improved. The present invention relates to a deep drawing composite film which can be suitably used for a so-called steam shrink type packaging method which can be improved.

[0002]

2. Description of the Related Art Bottom materials used in the above-mentioned steam shrink type packaging method include composite films of various constitutions, for example, those composed of polyolefin / gas barrier resin / polyolefin using polyolefin resin for the inner and outer layers. in use. However, depending on the resin used, there have been problems in appearance that gloss is deteriorated by spraying water vapor and that the sealing portion of the lid material is whitened.

[0003]

SUMMARY OF THE INVENTION The present invention has found a composite film for deep drawing which can be suitably used for a steam shrink type packaging method and has excellent appearance characteristics. Has an outer layer made of nylon 6 and an inner layer made of polyolefin, and an intermediate layer made of nylon 6 or nylon 6/66 interposed between the two layers via an adhesive layer. Is not more than the thickness of the intermediate layer, and the total thickness of the outer layer and the intermediate layer is in the range of 30 to 100 μm.

The polyamide resin used for the intermediate layer of the composite film of the present invention includes nylon 6 or nylon 6/66.
You need to use 66 for nylon 6/66
A copolymer having a component content of 15 to 20 mol% can be suitably used. By using nylon 6 or nylon 6/66 for the intermediate layer, the film strength such as pinhole resistance can be improved, and in particular, in a system in which a label is attached and steam sterilized after steam shrinking, the film and the label at the time of boiling sterilization are used. There is an advantage that wrinkling can be prevented. The thickness of the intermediate layer is preferably in the range of about 30 to 60 μm.

Further, it is necessary to use nylon 6 for the outer layer, which has the effect of imparting gloss to the film surface, the effect of preventing wet heat blocking, and the prevention of whitening of the lid sealing portion. The outer layer made of nylon 6 needs to have a thickness equal to or less than the thickness of the intermediate layer and a total thickness of the outer layer and the intermediate layer in the range of 30 to 100 μm. If the thickness of the outer layer exceeds half the thickness of the intermediate layer, the formability during deep drawing is inferior, and the total thickness of the outer layer and the intermediate layer is 30%.
If it is less than 10 μm, pinholes are likely to occur
If the thickness exceeds 0 μm, there is a problem that the film itself becomes too hard and is difficult to handle. The thickness of the outer layer is 15-40μ
A range of about m is preferable.

[0006] Further, the inner layer (sealing material layer) is a layer of polyolefin, and polyolefin resins include low-density polyethylene, linear low-density polyethylene, and ethylene-
Vinyl acetate copolymers, particularly those having a vinyl acetate content in the range of 3 to 8 mol%, are preferable because they have good sealing properties and the lid material is not easily peeled off during boiling sterilization. The thickness range of the inner layer is 50-1
Those having a range of about 00 μm can be suitably used. An adhesive layer of a carboxylic acid-modified polyolefin or the like is interposed between the above-mentioned resin layers to improve the adhesiveness between the layers, but the adhesive layer on the inner layer (sealant layer) side is omitted depending on the resin used for the inner layer. It is also possible.

Here, the nylon 6 of the outer layer tends to be easily affected by water vapor, so that the water repellency can be improved by overcoating the surface of the outer layer with a surface coating agent, for example, a nitrifying cotton-based material, if necessary. After steam shrink packaging,
There is an advantage that the label is not easily peeled off in the step of applying the label. The water repellency may be such that the contact angle with distilled water is in the range of about 70 ° to 105 °. If the contact angle is less than 70 °, water repellency is poor and water is interposed between the film and the label, and the adhesiveness is reduced. On the other hand, if the angle exceeds 105 °, there is a problem that the adhesiveness is reduced regardless of the presence or absence of water.

[0008]

According to the composite film of the present invention, a package having an excellent appearance can be obtained by a steam shrink type packaging method, and the composite film of the present invention is extremely useful as a packaging material for processed meat products of irregular shape such as handmade ham.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FIB29L 9:00 22:00

Claims (1)

(57) [Claims] 1. An outer layer comprising a nylon 6 layer, an inner layer comprising a polyolefin layer, and an intermediate layer comprising nylon 6 or nylon 6/66 interposed between the two layers via an adhesive layer. 6 is not more than the thickness of the intermediate layer, and the total thickness of the outer layer and the intermediate layer is 30 to 10
A composite film for deep drawing, wherein the thickness is in the range of 0 μm.