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Longitudinal drawing device

A technology of longitudinal stretching and circumferential speed, which can be used in transportation and packaging, object supply, winding strips, etc., and can solve problems such as transfer scratches and scratches

Active Publication Date: 2019-07-23
TORAY ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the thermoplastic film may have transfer scars on the surface due to the pressing force of the nip roller, or scratches due to the sliding between the transfer roller and the thermoplastic film.

Method used

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Examples

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Embodiment Construction

[0028] First, use figure 1 The manufacturing apparatus 1 provided with the longitudinal stretching apparatus 5 which is one embodiment of the longitudinal stretching apparatus of this invention is demonstrated. In addition, the manufacturing apparatus 1 manufactures a thermoplastic film F made of a thermoplastic polymer such as polyester, triacetyl cellulose (TAC), polyolefin, polyamide, etc. The case of the thermoplastic film F will be described.

[0029] Such as figure 1 As shown, the manufacturing apparatus 1 processes the thermoplastic polymer which consists of triacetyl cellulose (TAC), and manufactures the thermoplastic film F which consists of desired film thickness. The manufacturing device 1 has a melt extrusion device 2 , a slot die 3 , a casting roll 4 , a longitudinal stretching device 5 , a transverse stretching device 6 , and a coiling device 7 .

[0030] The manufacturing device 1 heats and melts a sheet-shaped thermoplastic polymer through a melt extrusion d...

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Abstract

Provided is a longitudinal drawing device capable of reducing the occurrence of transfer damage, scratches, or the like on a thermoplastic film when drawn longitudinally. Specifically, a longitudinaldrawing device (5) draws a thermoplastic film (F), heated by heating rolls (13), by means of a difference in peripheral speed between a plurality of low-speed driving rolls (8) and a plurality of high-speed driving rolls (9). The plurality of low-speed driving rolls (8) and the plurality of high-speed driving rolls (9) are respectively composed of suction rolls having low-speed-side suction holes(8b) and high-speed-side suction holes (9b) which are a plurality of suction holes in conveyance surfaces thereof for conveying the thermoplastic film (F). A plurality of the heating rolls (13) are provided between adjacent low-speed driving rolls (8) and high-speed driving rolls (9). Each of the plurality of heating rolls (13) is provided with a following electric motor (15) serving as an actuator. Each of the plurality of heating rolls (13) is configured to be independently rotationally drivable. The output torque of each of the following electric motors (15) is controlled so as to coincidewith a target value set for each of the following electric motors (15).

Description

technical field [0001] The present invention relates to longitudinal stretching devices. In detail, it is related with the longitudinal stretching apparatus which heats and stretches a thermoplastic film in a conveyance direction. Background technique [0002] Conventionally, thermoplastic films composed of thermoplastic polymers such as polyester, triacetyl cellulose (TAC), polyolefin, and polyamide have been used as supports for packaging films, plate-making substrates, printing films, lamination films, magnetic recording media, and optical discs. being widely used. Such a thermoplastic film such as a polyester resin is known to obtain excellent physical properties by stretching, and is generally used as a uniaxially stretched film or a biaxially stretched film. The above biaxially stretched film is produced by longitudinally uniaxially stretching and then transversely stretching. When stretching a thermoplastic film longitudinally, stretching is performed in the flow d...

Claims

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Application Information

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IPC IPC(8): B29C55/06B65H20/12B65H23/192
CPCB29C55/06B65H5/22B65H20/12B65H23/192B29C35/02B29C2037/903B65H2701/1752
Inventor 金岛成光青木敦
Owner TORAY ENG CO LTD
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