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Packaging material

A packaging material and base layer technology, applied in the field of polypropylene film packaging materials, can solve the problems of difficulty in obtaining tear strength, insufficient impact resistance, use restrictions, etc., achieving excellent transparency and appearance, and excellent packaging applicability , the effect of good tearing properties

Inactive Publication Date: 2012-10-03
SUNTOX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned stretched film needs a stretching device, and the rolls are easily polluted due to the need to increase the temperature of the rolls during stretching.
Stretching at high magnifications tends to cause uneven film thickness and uneven stretching during production, as well as a decrease in transparency.
[0009] In addition, when a film is made of a composition composed of a polypropylene resin and a sorbitol derivative, the tear directionality is improved, but the film produced smells, and its use in food is limited
In addition, after a period of time after the film is made, the sorbitol derivative bleeds to the surface of the film, reducing the transparency, and also causing the rollers to become dirty during secondary processing such as cutting and printing.
[0010] Moreover, when a film is made of a resin mixture of propylene polymer and styrene polymer, the transparency is poor due to the incompatibility of propylene polymer and styrene polymer.
In addition, the impact resistance is not sufficient due to the brittleness of the styrene polymer
[0011] In addition, if the easy-to-tear cast film made by mixing polypropylene resin with polyethylene and polybutene-1 is used, especially rice balls packaged in convenience stores and the like are heated in a microwave oven, and the film will not be damaged when eaten. poor tearability
[0012] Due to the above-mentioned problems, it has been difficult to obtain a film with excellent tear characteristics with good longitudinal tear directionality and low tear strength, good tear directionality even under a heated environment, odorless and excellent transparency and appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068]Example 1 As a raw material resin for a film, 0.2 mass percent of the composition shown in Table 2 was mixed with 99.8 mass percent of resin A (propylene homopolymer having a melting point of 165° C. (FLX80G7 manufactured by Sumitomo Chemical Co., Ltd.)) shown in Table 1. The core agent I was extruded at a temperature of 250° C. with a 65 mmΦ extruder and made into pellets, and the obtained resin was used for the base layer. Resin E shown in Table 1 (a propylene-ethylene random copolymer having an ethylene content of 3.4% by mass and a melting point of 146° C. (Japan Polypropylene Corporation FW3GT)) was used as the resin for the first surface layer. Next, the resin for the first surface layer is sent to extruder A (50mmΦ extruder), and the resin for the base layer is sent to extruder B (75mmΦ extruder), heated and melted at 250°C, in the diverter block method Next, extrude with a T-die with a lip of 1.2 mm by co-extrusion, and adjust it to a film with a total thickness ...

Embodiment 2

[0069] Examples 2 and 3 are exactly the same as Example 1 except that the total thickness of 25 μm is adjusted to 2 μm for the first surface layer and 23 μm for the base layer (Example 2) and 10 μm for the first surface layer and 15 μm for the base layer (Example 3). method to make a non-stretched film. The resulting film has excellent tear directionality, low tear strength, and good heat sealability.

Embodiment 4

[0070] Example 4 Except that the resin F shown in Table 1 (a propylene-ethylene-butene copolymer having an ethylene content of 3.2 mass percent, a butene content of 1.5 mass percent, and a melting point of 137° C. (FW4BT manufactured by Japan Polypropylene Corporation)) was used as A non-stretched film was prepared in exactly the same manner as in Example 1 except for the resin for the first surface layer in Example 1. The resulting film has excellent tear directionality, low tear strength, and good heat sealability.

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Abstract

The present invention provides a polypropylene film packaging material which is suitable for packaging rice roll, sandwich, etc. The transparency and the appearance are excellent. The smell from the film is seldom generated. Particularly the packaging material has high linearity in the tearing direction of the squeezing direction of resin in film manufacturing under heating environment, and has excellent tearing characteristic with low tearing strength. The packaging material made of polypropylene film is characterized in that the packaging material is a non-stretching film which comprises atleast two layers of a base layer and a surface layer and satisfies the following key points (1)-(3): (1) the base layer comprises 99-99.97% by mass of propylene homopolymer with melting point above 162 DEG C and 0.03-1% by mass of phosphate ester metal salt which is taken as the organic crystal nucleating agent, and has a thickness more than 10 mu m; (2) the surface layer is composed of propylene-alpha alkene copolymer with melting point lower than 155 DEG C and has a thickness more than 1 mu m; and (3) the thickness range of the base layer is more than 50% of the total thickness of the packaging material but is smaller than 98% of the total thickness.

Description

technical field [0001] The present invention relates to a packaging material composed of a polypropylene film, and more specifically, to a polypropylene film packaging material suitable for packaging rice balls, sandwiches, etc., which is excellent in transparency and appearance, and rarely produces an odor from the film. In particular, it relates to a packaging material having excellent tear characteristics, which has a high degree of linearity in the tearing direction toward the resin extrusion direction (hereinafter referred to as the longitudinal direction) at the time of film production even under a heated environment, and the tearing Low intensity. Background technique [0002] Conventionally, various packaging materials made of thermoplastic resin films have been proposed. These packaging materials are used first for food, and then for packaging of clothing, industrial parts, etc., and are widely used as packaging bags sealed by heat seals, etc., to preserve the cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D65/40B65D30/02B32B27/18B32B27/32C08L23/12C08K5/521
CPCB32B27/08B32B27/32B65D65/40B65D85/70
Inventor 仓本直彦石丸昌也大田智康
Owner SUNTOX