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Adhesive wrap film

A technology of film and tackifier, applied in the direction of film/sheet adhesive, packaging, adhesive, etc., can solve the problem that it is difficult to meet the adhesive sealing performance and unfolding performance, insufficient transparency of the encapsulating film, loss of transparency, etc. question

Inactive Publication Date: 2005-05-18
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that when the self-adhesive sealability of the wrapping film is high, it becomes difficult to peel the films from each other when unrolled from the decorative box, resulting in cutting
However, it was found that when not less than 0.1psi (= about 7g / cm 2 ), the 180° peel strength of the enveloping film is not less than 1oz / inch (about 11g / cm width), which is called "user operation", so there is a problem when the film with a long length is wound , it may happen that the winding pressure of the film exceeds the compressive strength applied by the user, so it is difficult to satisfy the adhesive sealing performance and unfolding performance from a practical point of view.
[0006] In addition, the size of the unevenness formed on the surface of the base layer is larger than the thickness of the base layer, starting from the fact that, moreover, the tackifier is applied discontinuously to the base layer (there is no increase in the convex portion of the base layer concavo-convex). Adhesive), the problem with this is that as long as the user does not apply compressive strength to the film and the material to be bonded under ideal conditions, it is easy to create spaces, and as a result, the contents, especially liquids, can easily spill out
Furthermore, light scattering promotes the loss of transparency, so that the transparency of the encapsulation film is not sufficient, causing serious problems of visual recognition of the wrapped items

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] High-density polyethylene layer (hereinafter referred to as HDPE, manufactured by NOVATEC, Japan Polychem Corporation, about 8 μm thick), ethylene-vinyl alcohol copolymer layer (hereinafter referred to as EVOH, SOARNOL, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.: about 4 μm thick ) and a high-density polyethylene layer (hereinafter referred to as HDPE, NOVATEC, manufactured by Japan Polychem Corporation, about 8 μm thick), a three-layer film (total thickness: about 20 μm) was manufactured using T-die casting as a substrate layer, and the heated 200-mesh metal The manufactured trapezoidal cup rolls (tooth pitch about 125 μm, line width about 25 μm, depth about 45 μm) pass between them, and rubber-made inverted rollers contact them under pressure, thus obtaining a film, which is formed on one side surface (I) of the film. The island structure, in which the convex parts in the shape of quadrangular pyramids arranged in a staggered form form an island, and ...

Embodiment 2

[0149] From high-density polyethylene (hereinafter referred to as HDPE, NOVATEC, manufactured by Japan Polychem Corporation) using a single-layer film produced by T-die casting as the substrate layer, trapezoidal cup-shaped rollers made of heated 200-mesh metal (pitch about 125 μm, line width about 25μm, about 45μm in depth), the rubber cup rollers are in pressure contact with it, thereby obtaining molded concave-convex shapes on both sides of the film, and forming a sea-island structure on one surface (I) of the film, in which the The convex part in the shape of a quadrangular pyramid forms an island, the concave part forms a continuous sea, and the other side (II) of the film has a concavo-convex shape that is consistent with the opposite side of the surface (I). The ten-point average roughness and average spacing of the uneven surface of HDPE itself were about 8 μm and about 120 μm, respectively. Subsequently, by adding styrene butadiene rubber (SBR, TAFTEC, manufactured by...

Embodiment 3

[0151] On both sides of the concave-convex surface (surface I and II) of the HDPE matrix layer obtained in Example 2, the ten-point average roughness of the concave-convex formed on the two surfaces of the film by the matrix layer is about 5 μm, and the average interval is about 120 μm. The tackifier used in Example 2 was coated by a double-sided coating reverse roll coater, and dried to form a tackifier layer. The thickness of the tackifier layer was about 3 μm at the concave part of HDPE, and about 3 μm at the convex part of the HDPE. The thickness of the part is about 1 μm, the ten-point average roughness of the concave-convex surface on the adhesion promoter layer is about 3 μm, and the average distance between the two surfaces is about 120 μm, so the concave-convex film shown in Figure 5 is obtained.

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Abstract

An adhesive wrapping film having a continuous tackifier layer (A) on at least one side surface of a substrate layer (B) whose surface has a concavo-convex form, wherein a thickness of the tackifier layer at the concave portion of the substrate layer is larger than that at the convex portion of the substrate layer, and a thickness of the substrate layer BAV, a thickness of the tackifier layer at the concave portion of the substrate layer Amax, a ten-point average roughness of the surface of the tackifier layer corresponding to a height of the convex portion of the tackifier layer RZ<(A)>, and a ten-point average roughness of the surface of the substrate layer corresponding to a height of the convex portion of the substrate layer RZ<(B) >satisfy a relation of the following conditional expressions (1) and (2):(1) Amax<RZ<(B)><BAV(2) RZ<(A)><RZ<(B)>.

Description

technical field [0001] The present invention relates to wrapping films suitable for wrapping, especially as wrapping films for household use. More specifically, the present invention relates to an adhesive encapsulating film having satisfactory adhesive sealing performance, unfolding performance and excellent transparency. Background technique [0002] Household wrapping films are used to wrap food placed on containers, mainly for storage in refrigerators or freezers or for heating food in microwave ovens. For such reasons, for example, there is a need for an encapsulating film having transparency and a moderate modulus of elasticity, which is stable even when heated by a microwave oven or the like so as not to be perforated, adhered to the container or self-deformed, and which is further Shows moderate self-adhesive sealing performance or adhesive sealing performance relative to containers in the range from low temperature to high temperature. [0003] As commercially ava...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/30C09J7/22
CPCY10S428/906C09J7/22C09J7/30Y10T428/24612Y10T428/24521Y10T428/28Y10T428/24355Y10T428/2495Y10T428/24628C09J2301/206C09J2301/204
Inventor 板田光善高桥丽子
Owner ASAHI KASEI CHEM CORP
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