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Manufacturing process of polyolefin resin film

A polyolefin-based resin and a technology for a manufacturing method, which can be applied to flat products, other household appliances, tubular articles, etc., can solve the problems that the transparency of the film may not be satisfactory, and the cost of the molding device is satisfactory.

Inactive Publication Date: 2009-07-08
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the transparency of the film obtained by the molding method using an air-cooled blow molding device may not be satisfactory.
In addition, the forming method using the water-cooled blow molding device, the transparency of the obtained film is better than the forming method using the air-cooled blow molding device, but because the extruder and the ring die are arranged on the upper part device, and therefore may not be satisfactory in terms of the cost of the forming device

Method used

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  • Manufacturing process of polyolefin resin film
  • Manufacturing process of polyolefin resin film
  • Manufacturing process of polyolefin resin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Installed in an upward-facing air-cooled blow molding device manufactured by Placo with a 50 mmΦ extruder, a ring die (lip diameter 125 mm, lip opening 2.0 mm), blowing device, and pulling device figure 1 The water cooling device shown is a water cooling device comprising a water supply device having a water supply pipe, a water supply ring, and a contact ring for water supply, and a drainage device having a downstream water recovery ring, a downstream drain pipe, an upstream water recovery ring, and an upstream drain pipe. device. A polyester nonwoven fabric sheet with a width of 30 mm (Nitoms Co., Ltd. Strong Dew Condensation Water Absorbent Tape 30 Silver E101) as a water absorbing material was wound around a contact ring for water supply and used.

[0053] The ethylene·1-hexene copolymer (sold by Sumitomo Chemical Co., Ltd., manufactured by Japan Evolue Co., Ltd., trade name: Sumikathene E FV203 (hereinafter referred to as PE-1)) produced by a metallocene catalyst i...

Embodiment 2

[0055] Except for using an ethylene-1-hexene copolymer produced by a Ziegler catalyst (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumikathene α CS8051 (hereinafter referred to as PE-2)) instead of PE-1, the same as in Example 1 operate. Table 1 shows the evaluation results of physical properties of the obtained film.

Embodiment 3

[0057] Using an ethylene-1-butene copolymer produced by a Ziegler catalyst (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumikathene L CL1079 (hereinafter referred to as PE-3)) instead of PE-1, the processing temperature was 190°C, Except for this, it was carried out in the same manner as in Example 1. Table 1 shows the evaluation results of physical properties of the obtained film.

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Abstract

The invention provides a process for producing a polyolefin resin film, which comprises extruding a melt of a polyolefin resin from an annular die in the antigravity direction to form a cylindrical film and cooling the cylindrical film while taking it up in the antigravity direction. The process for polyolefin resin film production is characterized in that the cooling is conducted by bringing a water-absorbing material which contains water and has a gravity-direction width of 5 mm or larger into contact with the peripheral surface of the cylindrical film in any position in the range of from the frost line resulting from the air cooling to a position 200 mm apart therefrom in the gravity direction.

Description

technical field [0001] The present invention relates to a method for producing a polyolefin-based resin film. Background technique [0002] Films formed of polyolefin-based resins such as polyethylene-based resins and polypropylene-based resins are excellent in strength and sanitation, so they are used as packaging films for food, daily groceries, etc. (for example, Japanese Patent Laid-Open No. 10-237187 Bulletin). As a method for producing such a film made of polyolefin resin, it has been proposed to melt and extrude polyolefin resin upward (in the direction of gravity) from a ring die to form a cylindrical film and pull the cylindrical film upwards. The film is formed by a device that is air-cooled on one side, that is, a so-called upward air-cooled blow molding device (for example, Japanese Patent Laid-Open No. 6-114929). The annular die of the machine is melted and extruded downward (gravity direction) to form a tubular film, and the device that is water-cooled while ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/20B29C47/88B29C55/28B29K23/00B29L7/00B29L23/00B29C48/10B29C48/32
CPCB29C47/8835B29K2023/06B29C47/0026B29C48/10B29C48/913
Inventor 近成谦三浅见一弘
Owner SUMITOMO CHEM CO LTD
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