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Blown film forming device

A molding device and height technology, which is applied in the field of blown film molding devices, can solve the problems of inability to distinguish and determine the circumferential distribution of solidification line height, etc.

Active Publication Date: 2022-07-15
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the resin is transparent or translucent, not only the solidification line F of the front side part of the tubular resin but also the solidification line F of the back part are captured in the captured image, but it cannot be distinguished from the image These
That is, in figure 1 Among them, it is impossible to distinguish which of the solidification line F located on the upper side and the solidification line F located on the lower side is the solidification line at the front side and which is the solidification line at the far side
As a result, it is also impossible to determine the circumferential distribution of the freezing line height

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0026] figure 2 The basic structure of the film blow molding apparatus 1 which concerns on 1st Embodiment is shown. The film blow molding apparatus 1 includes a mold 2 , a cooling device 3 , a pair of stabilization plates 4 , a tractor 5 , a thickness acquiring unit 6 , a first imaging device 26 , a second imaging device 27 , and a control device 7 .

[0027] The molten transparent or translucent resin supplied from an extruder (not shown) is extruded from an annular discharge port 2 a formed in the die 2 . At this time, air is ejected from the air ejection port 2b formed in the center portion of the die 2 to the inside of the extruded resin, thereby forming a thin resin film (hereinafter, also referred to as "tube bubble") expanded into a tubular shape.

[0028] The cooling device 3 is arranged above the mold 2 . The cooling device 3 blows cooling air into the tube bulbs to cool the tube bulbs.

[0029] A pair of stabilizing plates 4 are arranged above the cooling device ...

no. 2 Embodiment approach

[0073] In the first embodiment, the case where the circumferential distribution of the height of the coagulation line is determined based on two images captured from below the height of the coagulation line F has been described. In the second embodiment, the case where the circumferential distribution of the height of the coagulation line is determined from one image captured from below the height of the coagulation line F will be described. Hereinafter, the difference from the first embodiment will be mainly described.

[0074] Figure 7 The basic structure of the film blow molding apparatus 1 which concerns on 2nd Embodiment is shown. The film blow molding apparatus 1 includes a mold 2 , a cooling device 3 , a pair of stabilizer plates 4 , a tractor 5 , a thickness acquiring unit 6 , a first imaging device 26 , and a control device 7 . That is, unlike the film blow molding apparatus of the first embodiment, the film blow molding apparatus 1 of the present embodiment does n...

no. 3 Embodiment approach

[0090] In the above-described embodiment and these modifications, the case where the circumferential distribution of the height of the coagulation line is determined based on the image captured from below or above the height of the coagulation line F has been described. In the third embodiment, the case where the circumferential distribution of the height of the coagulation line is determined from two images taken in the horizontal direction from substantially the same height as the coagulation line F will be described. Hereinafter, the difference from the first embodiment will be mainly described.

[0091] Figure 8 The basic structure of the film blow molding apparatus 1 which concerns on 3rd Embodiment is shown. The film blow molding apparatus 1 includes a mold 2 , a cooling device 3 , a pair of stabilization plates 4 , a tractor 5 , a thickness acquiring unit 6 , a first imaging device 26 , a second imaging device 27 , and a control device 7 .

[0092] The first imaging ...

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PUM

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Abstract

The invention provides a blown film forming device capable of determining the circumferential distribution of the height of the solidification line. The blown film forming apparatus is provided with a mold for extruding a transparent or translucent resin in a tubular shape, and a determining part (52), the determining part (52) photographing the solidification of the extruded tubular resin from a position above the height of the solidification line Two images of the line or two images of the solidification line of the extruded tubular resin are taken from a position below the height of the solidification line to determine the circumferential distribution of the height of the solidification line.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2019-068588 filed on March 29, 2019. The entire contents of the Japanese application are incorporated herein by reference. [0002] The invention relates to a blown film forming device. Background technique [0003] There is known blown film molding in which a molten resin is extruded from a die into a tubular shape, and air is blown into the inner side to expand it into a thin film shape. Conventionally, there has been proposed a technique of controlling the thickness of the resin within a target range by adjusting the width of the lip, the air volume and air temperature of the cooling air. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2017-177348 [0005] When the height of the frozen line (frost line) becomes uneven in the circumferential direction, the quality of the film such as slack occurs in the film, and the quality of the film deteriorates. Therefore, in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/92B29C55/28B29C48/00B29C48/87B29C48/32B29C48/355B29C48/28
CPCB29C48/92B29C55/28B29C48/0018B29C48/87B29C48/32B29C48/355B29C48/28B29C2948/92152
Inventor 藤原一优石原佐知
Owner SUMITOMO HEAVY IND LTD