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Aromatic polycarbonate resin injection formed piece

A technology of polycarbonate resin and molded products, which can be used in flat products, applications, household appliances, etc., and can solve the problems of unpublished technical insights of linear meeting parts.

Active Publication Date: 2013-04-17
TEIJIN KASEK KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, moldings obtained by these injection molding methods are effective molding methods for eliminating weld lines on the surface of molded products, but no technical knowledge has been disclosed about the iridescent line-shaped junctions.

Method used

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  • Aromatic polycarbonate resin injection formed piece
  • Aromatic polycarbonate resin injection formed piece
  • Aromatic polycarbonate resin injection formed piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Polycarbonate resin pellets (manufactured by Teijin Chemicals: PANLITE L-1250Z (trade name)) as a resin material were dried at 110° C. for 5 hours. This resin material is injection-press-molded using a large-scale injection molding machine equipped with a 4-axis parallel control mechanism (Meiki Seisakusho: MDIP2100, maximum clamping force 33,540kN), and manufactured figure 2 The shown is a large molded product with a thickness of 4mm, a length of 1,200mm, and a width of 1,000mm. In this molding machine, the dried pellets are supplied to the supply port of the molding machine by pressurized conveyance, and used for molding. As the runner, a valve gate type hot runner (diameter 8mmφ) manufactured by HOTSYS Co., Ltd. was used.

[0077]Molding conditions are barrel temperature 310°C, hot runner setting temperature 280°C, mold temperature 110°C on the movable side, 110°C on the fixed side, compression stroke 4.0mm, moving speed of the mold from the intermediate mold clamp...

Embodiment 2

[0080] The molding conditions were the same as in Example 1 except that the cylinder temperature was 310°C, the hot runner set temperature was 280°C, the mold temperature was 90°C on the movable side, 90°C on the fixed side, and the compression stroke was 2.0 mm. For molding. The obtained molded articles were evaluated, and the results are shown in Table 1.

Embodiment 3

[0082] Molding was performed in the same manner as in Example 1 except that the molten resin was filled by simultaneous injection. The obtained molded articles were evaluated, and the results are shown in Table 1.

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Abstract

The invention provides an aromatic panlite formed piece, wherein an iridescent linear confluence part can not be observed under sunlight and indoor fluorescent lamp, characterized in that: the linear confluence part can be observed by clamping the formed piece between the two polaroids and irradiated by the transmitted light and a virtual reference line is set to be orthogonal with the linear confluence part and the intersection point of the linear confluence part and the virtual reference line is used as the center and the double-refraction of the transmission direction is measured in the measurement range of 5mm and 300mm and the principal stress of each measurement point obtained by the Brewster principle is marked as S(i)(i=1,2,3... 61), furthermore the absolute value of the principal stress gradient [|S(i)-S(i+1)| / 5] obtained by dividing the difference between the principal stress S(i) and principal stress S(i+1) by the measurement range is marked as G(i)(i=1,2,3...,59), satisfying the following formula (1). G(i)+G(i+1)+G(i+2)(i=1,2,3...,59)<0.40(1).

Description

technical field [0001] The present invention relates to injection molded articles made of aromatic polycarbonate resins. Specifically, it relates to an injection molded article in which iridescent linear junctions are not observed on the surface of the molded article under sunlight or indoor fluorescent lamps. Background technique [0002] In recent years, molded products made of polycarbonate resins have been used as glazing members represented by panoramic sunroofs and rear door windows of automobiles, front panels of liquid crystal televisions, plasma televisions, and the like. However, in a large molded product having a junction of resin, etc., sunlight, light from indoor fluorescent lamps, etc. interfere as reflected light on the surface of the molded product, and iridescent linear junctions are observed. The iridescent linear junctions are caused by the directional deformation of the molecules of the aromatic polycarbonate resin in the molded product surface. At the j...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/00B29C45/00B29C45/27B29K69/00
Inventor 三浦淳一
Owner TEIJIN KASEK KK