Method for producing resin strand

a technology of resin strands and strands, which is applied in the field of resin strand production, can solve the problems of affecting the quality of resin strands, so as to reduce the formation of strands, improve product quality, and increase yield

Inactive Publication Date: 2007-10-11
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027] The use of the production method of the present invention not only eliminates a breakage of strands during production to increase the yield, but also significantly suppresses formation of adhered consecutive pellets to improv...

Problems solved by technology

In the latter case, a phenomenon of a partial narrowing of strands is liable to occur because the strand-shaped molten resin cannot be cooled uniformly.
As a result, there has been a problem that strand are broken between the conveyor and strand cutter.
Moreover, there has been a further problem that formation of pellets referred...

Method used

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  • Method for producing resin strand

Examples

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example 1

The Present Invention

[0180] The maximum cylinder temperature of a co-rotating twin screw extruder was set at 320° C., the extruder having an L / D of 48 provided with one feed port in the upstream side and one feed port in the downstream side [ZSK70MC: manufactured by Coperion Corporation, having 12 temperature control blocks (L / D per block being 4) and an auto screen changer block; upstream feed port: the first block, downstream feed port: the sixth block, vent ports to remove volatiles by vacuum suction: the fifth block and the tenth block]. From the upstream feed port were fed separately (using separate feeders without being blended) to the extruder and melt-kneaded 35 parts by mass of polyphenylene ether [S201A: manufactured by Asahi Kasei Chemicals Corporation], 0.1 part by mass of granular maleic anhydride manufactured by ACROS ORGANICS (Germany), 10 parts by mass of a styrene-ethylenebutylene-styrene block copolymer [Kraton G1651: manufactured by Kraton Polymers] as elastomer ...

example 2

The Present Invention

[0186] All experiments were performed in the same manner as in Example 1 except that the strands were cooled by installing three water spraying apparatuses for cooling strands in total were installed at positions ranging from 1.8 m apart from the die holes (a position downstream by 28% of the total length of the conveying part of the conveyor) to 2.3 m apart from the die holes (a position downstream by 35% of the total length of the conveying part of the conveyor), and various performances were evaluated. The results are shown in Table 1.

examples 3 and 4

The Present Invention

[0187] All experiments were performed in the same manner as in Example 1 except that the extruder capacity was changed, and various performances were evaluated. The results are shown in Table 1.

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Abstract

The present invention can eliminate a breakage of strands on the way to increase yield, significantly suppress formation of adhered consecutive pellets, and obtain pellets having a low moisture content by a method for producing a resin strand comprising melt-kneading a resin composition in an extruder, extruding a strand-shaped molten resin onto a conveyor, and cooling the resin strand with cooling water, wherein the conveyed strand-shaped molten resin is brought into initial contact with the cooling water at a position downstream ranging from 20% to 70% of the total length of the conveying part of the conveyor.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for producing a strand in which, when the strand is cooled on a conveyor, a breakage of the strand can be suppressed to significantly improve the yield of pellets, to a strand obtained by the production method, and to pellets obtained by cutting the strand. The present invention further relates to a method for producing a resin strand for uniforming melt viscosity of a resin strand, improving strand draw-off stability, and obtaining a thermoplastic resin composition consistently excellent in impact resistance by stably feeding one or more compounds selected from the group of maleic acid, citric acid, fumaric acid, and an anhydride thereof, and to a preblend that can be stably fed. [0003] 2. Description of the Related Art [0004] An example of processing equipment widely used for the production of thermoplastic resin pellets is an extruder. Examples of the methods for obtainin...

Claims

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Application Information

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IPC IPC(8): D01D5/088D01F1/02D01F1/09
CPCB29B9/06B29B9/12B29B9/14C08K5/1539C08L71/12B29C48/0022B29C48/885B29C48/92B29C48/355B29B7/72B29B7/823B29B7/42B29B7/48B29B7/90B29B7/845B29B7/86B29B7/826
Inventor MIYOSHI, TAKAAKI
Owner ASAHI KASEI CHEM CORP
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