Process for producing roll of microporous plastic film

A technology of microporous plastics and manufacturing methods, which is applied in thin material processing, winding strips, electrolytic capacitors, etc., can solve the problems of wrinkles and breakage, difficult handling, etc., and achieve the effect of high productivity

Inactive Publication Date: 2013-12-18
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The object of the present invention is to provide a method for producing a microporous plastic film, which can solve the conventional problems of wrinkling and damage caused by the existence of micropores, and further processing difficulties

Method used

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  • Process for producing roll of microporous plastic film
  • Process for producing roll of microporous plastic film
  • Process for producing roll of microporous plastic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Controlling the crystalline structure of polypropylene, utilizing figure 1Such conveying rollers 2 are formed by a biaxial stretching process. Figure 4 The polypropylene microporous plastic film 1 with such a through-hole was conveyed and wound up continuously on the core 6 to manufacture the microporous plastic film roll 12 . The Gurley air resistance value of the polypropylene microporous membrane is 500 seconds / 100ml, the porosity is 70%, the average pore diameter is 100nm, and the buffer rate is 17%. The film 1 has a width of 600 mm and a thickness of 60 μm. The thickness was measured by a light emitting and receiving type laser sensor, and the porosity was obtained by Equation 6 based on the measured thickness.

[0105] Here, air permeability is based on JISP8117 (2001), and can be represented by the Gurley air resistance value (second / 100ml). The Gurley air resistance value is the passage time of the microporous membrane under the condition of pressing 100ml o...

Embodiment 2

[0122] A film 1 having a thickness of 20 μm was wound up under the same conditions as in Example 1 to manufacture a microporous plastic film roll 12 . The porosity of this film was the same as that of Example 1, and the Gurley air permeability resistance value was 100 seconds / 100 ml due to the thinner thickness.

Embodiment 3

[0124] With respect to Example 2, in order to make the friction coefficients of the four parts of the conveying rollers 21 to 24 in contact with the film 1 be 0.5 or less, on the surfaces of these rollers, figure 2 In that form, a composite film of polytetrafluoroethylene (PTFE) and metal is formed. Regarding the surface roughness of the roll surface, ten-point average roughness was measured under the same conditions as in Example 1.

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Abstract

A process for producing a roll (12) of a microporous plastic film which includes conveying a microporous plastic film (1) by means of a plurality of conveyor rollers (21-24) and winding the film on a core (6). At least one of the conveyor rollers (21-24) has a surface constituted of a fluororesin or a silicone rubber or of a composite material (9) containing either. The composite material (9) comprises a hard chromium layer (7) formed by plating and a fluororesin (8). The at least one roller has a surface roughness RzJIS of 0.3-30 [mu]m. The film (1) has a plurality of through-holes (17) therein and is for use as the separators (16) of a lithium-ion secondary battery (10) or as the separators of capacitors. The film (1) can be prevented from creasing or breaking, because the coefficient of friction between the film (1) and the conveyor rollers (21-24) is low.

Description

technical field [0001] The present invention relates to a method of manufacturing microporous plastic film rolls. Background technique [0002] Conventionally, it has been very difficult to avoid wrinkles and breakages that are thought to be caused by micropores when transporting and winding microporous plastic films used for separators for secondary batteries and the like in rolls. [0003] In Non-Patent Document 1, the threshold value of wrinkle generation in a general film is theoretically obtained, and countermeasures are proposed as a method of preventing the wrinkle. According to this document, the critical value for the generation of wrinkles is indicated by the tension and the calibration angle, especially with regard to the critical value of the tension, which is determined by the thickness of the film and Young's modulus, width, coefficient of friction. In addition, as a countermeasure, it is proposed to adjust the tension of the film while predicting a slip criti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65H27/00H01G9/02H01M2/16H01M50/403H01M50/414H01M50/489H01M50/491
CPCB65H27/00B65H2404/18B65H2404/531B65H2511/135B65H2701/1718B65H2701/1752H01G11/52B65H18/10B65H2401/111Y02E60/10H01M50/44H01M50/403H01M50/491H01M50/414H01M50/489H01G9/02H01M50/409Y02E60/13B65H18/08
Inventor 一宫崇松本忠
Owner TORAY IND INC
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