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Stretch film manufacturing method

A manufacturing method and film technology, applied to flat products, applications, household appliances, etc., can solve problems such as film breakage, and achieve excellent productivity and quality

Active Publication Date: 2018-04-24
TOYO KOHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In such a simultaneous biaxial stretching method, the film is heated and stretched to a desired stretching ratio by stretching the film in a heating furnace in the length direction and the width direction, but when stretching the film, due to the , The part held by the jig, that is, the two ends, is subject to a large stress. Therefore, cracks may occur at both ends of the film or in the thinned part of the film, and the entire film may break from this point.

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0044] Hereinafter, a first embodiment of the present invention will be described based on the drawings.

[0045] The method for producing a stretched film according to the first embodiment includes the following steps: a pre-stretching film forming step in which a pre-stretching film is formed by melt-extruding a thermoplastic resin through a T-die for forming. a film; and a stretching step of heating and stretching the pre-stretched film in the longitudinal direction and the width direction.

[0046] Film forming process before stretching

[0047] The unstretched film forming step is a step of obtaining the unstretched film 100 by melt-extruding a thermoplastic resin from a T-die. here, figure 1 It is a figure for explaining the film formation process before stretching.

[0048] In the pre-stretching film forming step, first, a thermoplastic resin is supplied to the T-die 220 through the supply block 210 in a heated and melted state.

[0049] In this embodiment, a mel...

no. 2 Embodiment approach

[0093] Next, a second embodiment of the present invention will be described based on the drawings.

[0094] The method for producing a stretched film according to the second embodiment includes the following steps: a pre-stretching film forming step in which the first thermoplastic resin PA and the first A second thermoplastic resin PC different in thermoplastic resin is melted and co-extruded to form a pre-stretched film (composite film); and a stretching step in which the pre-stretched film is heated and stretched in the longitudinal direction and the width direction .

[0095] Film forming process before stretching

[0096] The pre-stretch film forming step is a step of forming the pre-stretch film 100 by melt-coextruding the first thermoplastic resin PA and the second thermoplastic resin PC from a T-die. here, Figure 7 It is a figure for explaining the film formation process before stretching. In this embodiment, as the film 100 before stretching, such as Figure 7...

Embodiment 1

[0161] As a thermoplastic resin for forming the pre-stretched film 100, an acrylic resin (glass transition temperature Tg 1 : 123°C, elongation at break at room temperature: 5%).

[0162] Here, for the prepared thermoplastic resin, its glass transition temperature was measured by differential scanning calorimetry (DSC), and its elongation at break was measured by a tensile tester (manufactured by ORIENTEC CORPORATION, model: RTC-1210A) . The same applies to Example 2 and Comparative Example 1 below.

[0163] Next, use the prepared thermoplastic resin such as figure 1 As shown, the unstretched film 100 was produced under the following conditions. Here, the entire width of the produced pre-stretched film 100 is about 310 mm. And, the thickness of the produced film 100 before stretching was measured, and as a result, the average thickness t of the central portion 110 c is 160 μm, the minimum thickness t of the boundary portion 130 b is 128μm, the maximum thickness t of bot...

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Abstract

The present invention provides a method for producing a stretched film comprising the steps of cooling and solidifying thermoplastic resin melt-extruded from a forming die (220) by using rolls (230, 240), Thereby forming the process of the pre-stretched film (100); and the process of forming the stretched film by heating and stretching the pre-stretched film (100) in at least one direction, the method of manufacturing the stretched film is characterized in that, In the step of forming the unstretched film (100), the central part of the unstretched film (100) shrinks by planar stretching, and both ends of the unstretched film (100) shrink by uniaxial stretching. When the minimum thickness of the boundary portion formed between the central portion and the two end portions is tb, and the average thickness of the central portion is tc, the minimum thickness tb and the average thickness tc The unstretched film (100) is formed so that the ratio "tb / tc" is 0.75 or more.

Description

technical field [0001] The invention relates to a method for manufacturing a stretched film. Background technique [0002] When manufacturing a stretched film, prepare a film as a material, and use the method of stretching the prepared film to stretch the film. As a method for stretching a film, the following synchronous biaxial stretching method, etc. are known: The film is conveyed into a heating furnace while holding both ends of the film with clips, and in the heating furnace, the film is simultaneously heated and stretched in the longitudinal direction and the width direction by the clips holding both ends of the film. [0003] In such a simultaneous biaxial stretching method, the film is heated and stretched to a desired stretching ratio by stretching the film in a heating furnace in the length direction and the width direction, but when stretching the film, due to the 1. Large stress is applied to both ends of the part held by the jig. Therefore, cracks may occur at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/16B29C47/06B29C47/14B29K33/00B29L7/00B29C48/08B29C48/305B29C48/92
CPCB29C55/16B29C55/14B29C48/92B29C48/08B29C48/0011B29C48/0018B29C48/0022B29C48/19B29C48/305B29C48/91B29C48/914B29C48/9155B29C49/78B29C48/30
Inventor 稻泽弘志清家邦博山本省吾平郡香藤泽健一
Owner TOYO KOHAN CO LTD