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Die head for extrusion molding and extrusion molding machine

A technology of extrusion molding and die head, which is applied in the field of extrusion molding die head and extrusion molding machine, and can solve the problem of low thermal stability

Pending Publication Date: 2022-07-15
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fishtail dies are not as widely used as coat hanger dies, but are used for molding resin materials with low thermal stability, etc.
However, there is currently no fishtail type die with a mechanism for controlling the width of the slit opening in the short side direction.

Method used

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  • Die head for extrusion molding and extrusion molding machine
  • Die head for extrusion molding and extrusion molding machine
  • Die head for extrusion molding and extrusion molding machine

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0074] (Preparation of molding material)

[0075] As the molding material, a ceramic molding material obtained by mixing and kneading 100 parts by mass of alumina powder (ceramic particles), 10 parts by mass of methyl cellulose (organic binder), and 30 parts by mass of water (dispersion medium) was used. In order to evaluate the molding speed, a part of the molding material was colored blue with a colorant.

[0076] Forming material at shear rate 0.1s -1 Viscosity under 1.5 x 10 5 Pa s, at shear speed 1s -1 Viscosity under 2.0 x 10 4 Pa s, at shear speed 10s -1 Viscosity under 3.0 x 10 3 Pa·s.

[0077] In addition, the viscosity of the molding material was measured according to JIS K7199:1999. A commercially available capillary rheometer was used for the measurement. The diameter of the thin tube is 1-2 mm, and the length is 25-50 mm.

Embodiment 1

[0079] The extrusion molding of the above-mentioned molding material was performed using, as a pair of die main bodies, a die in which a hanger-type die and a fishtail-type die having a thickness adjustment mechanism were combined.

[0080] Use of hanger die figure 2 and image 3 A die of the shape shown (channel width of the introduction part: 19 mm, depth of the channel of the introduction part: 9.5 mm, opening angle α of the manifold part: 180°). Fishtail Die Use Figure 4 and Figure 5 A die of the shape shown (channel width of the introduction part: 19 mm, depth of the channel of the introduction part: 9.5 mm, opening angle β of the enlarged part: 80°, inclination angle of the ridge line: 10°). In addition, the width L1 of the slit opening in the longitudinal direction (direction Y) was 200 mm, the length L2 from the inlet to the slit opening was 200 mm, and the width in the short-side direction (direction Z) of the slit opening was 1.5 mm.

[0081] Extrusion molding...

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Abstract

The invention provides an extrusion molding die and an extrusion molding machine, which can form a sheet with uniform thickness regardless of the type of a forming material. A die (100) for extrusion molding is provided with a pair of die bodies (10a, 10b) having a pair of lip parts (11a, 11b) disposed facing each other so as to constitute a slit opening (20), and a pair of introduction parts (12a, 12b) disposed facing each other so as to constitute an introduction opening (30). One die body (10a) is a hanger-type die (50) having a thickness adjustment mechanism, and the other die body (10b) is a fishtail-type die (60).

Description

technical field [0001] The present invention relates to a die for extrusion molding and an extrusion molding machine. Background technique [0002] When molding the molding material into a sheet shape with an extrusion molding machine, a flat die (hereinafter, simply referred to as a "die") is provided at the discharge port of the extrusion molding machine. The die head generally includes a pair of die head bodies having a pair of die lips arranged to face each other so as to constitute a slit mouth, and a pair of introduction portions arranged to face each other so as to constitute an inlet mouth. The molding material extruded by the extrusion molding machine is introduced into the die head from the introduction port, and is molded into a sheet shape through the slit port. [0003] As the type of the die body, a coat hanger type die having a manifold portion is widely used. Here, in this specification, a "hanger-type die" is a concept including a T-die. In addition, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/07B29C48/31B29L7/00
CPCB29C48/07B29C48/31B29L2007/002B29C48/305B29C48/08B29C48/302B29C48/313B29K2509/02B29L2007/00
Inventor 岩田康资山口龙次田岛裕一
Owner NGK INSULATORS LTD