Process for preparing pencil through micro-foaming of polystyrene

A polystyrene and micro-foaming technology, applied in the direction of pencil lead, non-active pencil, application, etc., can solve the pollution of toxic and harmful substances, etc., and achieve the effect of short cycle, less warping and deformation, and light weight

Active Publication Date: 2018-12-14
安徽得亿文教用品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to produce penholders of different colors, wooden pencils need to use paint to spray their outer surfaces, which will inevitably cause pollution of toxic and harmful substances, and it is undoubtedly a big problem for penholders that are in close contact with the human body. disadvantages

Method used

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  • Process for preparing pencil through micro-foaming of polystyrene
  • Process for preparing pencil through micro-foaming of polystyrene
  • Process for preparing pencil through micro-foaming of polystyrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of technology that polystyrene microfoam prepares pencil, comprises the following steps:

[0031] (1) Refill granulation: weigh 80kg of polystyrene, 15kg of talcum powder, 15kg of thermoplastic elastomer SBS, 80kg of graphite, 0.2kg of zinc stearate, 1.3kg of calcium stearate, and 10kg of monoglyceride stearate After mixing, stir evenly, and then add it to the extruder barrel preheated to 220°C for melting and plasticization. Under the pressure of 120MPa, quickly inject supercritical fluid carbon dioxide into the extruder barrel. In the plastic melt, through the shearing of the screw, the supercritical fluid carbon dioxide is dispersed and homogenized, fully dissolved with the polymer melt to form a single-phase melt, and the pressure at this time is maintained. After saturation and equilibrium, it is extruded and cooled. , made into refill particles;

[0032] (2) Pen skin granulation: weigh 90kg of polystyrene, 27kg of thermoplastic elastomer SBS, 13kg of pigme...

Embodiment 2

[0042] A kind of technology that polystyrene microfoam prepares pencil, comprises the following steps:

[0043] (1) Refill granulation: weigh 80kg of polystyrene, 15kg of talcum powder, 15kg of thermoplastic elastomer SBS, 80kg of graphite, 0.2kg of zinc stearate, 1.3kg of calcium stearate, and 10kg of monoglyceride stearate After mixing, stir evenly, and then add it to the extruder barrel preheated to 220°C for melting and plasticization. Under the pressure of 120MPa, quickly inject supercritical fluid carbon dioxide into the extruder barrel. In the plastic melt, through the shearing of the screw, the supercritical fluid carbon dioxide is dispersed and homogenized, fully dissolved with the polymer melt to form a single-phase melt, and the pressure at this time is maintained. After saturation and equilibrium, it is extruded and cooled. , made into refill particles;

[0044] (2) Pen skin granulation: weigh 90kg of polystyrene, 27kg of thermoplastic elastomer SBS, 13kg of pigme...

Embodiment 3

[0055] A kind of technology that polystyrene microfoam prepares pencil, comprises the following steps:

[0056] (1) Refill granulation: weigh 80kg of polystyrene, 15kg of talcum powder, 15kg of thermoplastic elastomer SBS, 80kg of graphite, 0.2kg of zinc stearate, 1.3kg of calcium stearate, and 10kg of monoglyceride stearate After mixing, stir evenly, and then add it to the extruder barrel preheated to 220°C for melting and plasticization. Under the pressure of 120MPa, quickly inject supercritical fluid carbon dioxide into the extruder barrel. In the plastic melt, through the shearing of the screw, the supercritical fluid carbon dioxide is dispersed and homogenized, fully dissolved with the polymer melt to form a single-phase melt, and the pressure at this time is maintained. After saturation and equilibrium, it is extruded and cooled. , made into refill particles;

[0057] (2) Pen skin granulation: weigh 90kg of polystyrene, 27kg of thermoplastic elastomer SBS, 13kg of pigme...

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Abstract

The invention discloses a process for preparing a pencil through micro-foaming of polystyrene, and relates to the technical fields of manufacturing and processing of pencils. The preparation process comprises the following steps: (1) granulation of a pencil core; (2) granulation of a pencil skin; (3) granulation of a pencil holder; (4) wire drawing; (5) cutting and polishing; (6) assembling of a rubber eraser head; (7) trademark printing; (8) sharpening; (9) cleaning; and (10) packaging. The process provided by the invention has the following advantages: a micro-foaming technology is utilized,so the process has short pencil manufacturing cycle period, is reduced in cost, and has simple, convenient and practicable operation; the pencil produced by using the process provided by the invention has exquisite and beautiful appearance, does not generate core shift and core breaking, has moderate curling hardness, is smooth to write and has strong coloring property; in addition, the process provided by the invention saves a large amount of high-quality wood, reasonably and effectively protects national forest resources, protects the ecological environment at the same time, and has a greatsignificance on environmental protection in China.

Description

Technical field: [0001] The invention relates to the technical field of pencil manufacturing and processing, in particular to a technique for preparing pencils by microfoaming polystyrene. Background technique: [0002] The micro-foaming process refers to the injection of supercritical fluid into the cylinder in the injection molding cycle in the field of plastic production and processing to create a large number of uniform micron-sized closed cells in the plastic. The micro-foaming injection molding process is an innovative precision injection molding technology, which breaks through many limitations of traditional injection molding, can significantly reduce the weight of the part, shorten the molding cycle, and greatly improve the warping deformation and dimensional stability of the part sex. Especially in the production of high-quality precision products, the micro-foaming injection molding process has great advantages. [0003] Polystyrene is colorless and transparent,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00C08L25/06C08L53/02C08K5/103C08K3/34C08K5/098C08K13/02C08J9/12B43K19/16B43K19/18
CPCB43K19/16B43K19/18C08J9/122C08J2203/06C08J2203/08C08J2325/06C08J2453/02C08K3/34C08K5/098C08K5/103C08K13/02C09D13/00Y02P20/54
Inventor 张育玮张枫杨勇王达传
Owner 安徽得亿文教用品有限公司
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