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Blown film forming device

A technology of forming device and image, applied in the field of film blowing forming device, can solve the problems of inability to discriminate, inability to determine the circumferential distribution of the height of the solidification line, etc.

Active Publication Date: 2020-10-09
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 blown film molding apparatus 1 which concerns on 1st Embodiment is shown. The blown film molding apparatus 1 includes a mold 2 , a cooling device 3 , a pair of stabilizing plates 4 , a tractor 5 , a thickness acquisition unit 6 , a first imaging device 26 , a second imaging device 27 , and a control device 7 .

[0027] Melted transparent or translucent resin supplied from an extruder (not shown) is extruded from an annular outlet 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 toward the inside of the extruded resin, thereby forming a thin resin film expanded into a tubular shape (hereinafter, also referred to as “bubble”).

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

[0029] A pair of stabilizing plates 4 are arranged above the cooling device 3 and guide t...

no. 2 Embodiment approach

[0073] In the first embodiment, the case where the circumferential distribution of the height of the freezing line F is determined based on two images taken from below the height of the freezing line F has been described. In the second embodiment, a case will be described in which the circumferential direction distribution of the height of the freezing line F is specified from one image captured from below the height of the freezing line F. FIG. Hereinafter, the description will focus on differences from the first embodiment.

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

no. 3 Embodiment approach

[0090] In the above-mentioned embodiment and these modified examples, the case where the circumferential distribution of the height of the freezing line F is determined based on an image taken from below or above the height of the freezing line F has been described. In the third embodiment, a case will be described in which the circumferential distribution of the height of the freezing line is determined from two images taken in the horizontal direction from substantially the same height as the freezing line F. FIG. Hereinafter, the description will focus on differences from the first embodiment.

[0091] Figure 8 The basic structure of the blown film molding apparatus 1 which concerns on 3rd Embodiment is shown. The blown film molding apparatus 1 includes a mold 2 , a cooling device 3 , a pair of stabilizing plates 4 , a tractor 5 , a thickness acquisition 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 a solidification line. The blown film forming device is equipped with a moldfor extruding transparent or translucent resin into a tube shape and a determination part (52). The determination part (52) determines the circumferential distribution of the height of a solidification line according to two images, photographed from a position above the height of the solidification line, of the solidification line of the extruded tube-shaped resin, or two images, photographed from a position below the height of the solidification line, of the solidification line of the extruded tube-shaped resin.

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 this Japanese application are incorporated herein by reference. [0002] The invention relates to a blown film forming device. Background technique [0003] Blown film molding is known in which molten resin is extruded from a die into a tube, and air is blown inside to inflate it to form a thin film. Conventionally, a technique has been proposed to control the thickness of the resin within the target range by adjusting the lip width, the cooling air volume, and the air temperature. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2017-177348 [0005] If the height of the freezing line (frost line) becomes non-uniform in the circumferential direction, the quality of the film will deteriorate, such as slack in the film. Therefore, in blown film molding, it is more important to control the height of the solidif...

Claims

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Application Information

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Patent Type & Authority Applications(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