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Seamless belt forming die and manufacturing method thereof

A molding die, seamless technology, applied in the direction of belts, household appliances, other household appliances, etc., can solve the problems of thickness uniformity, poor surface smoothness, poor uniformity and difficulty in dispersion of additives, conductive fillers, etc., and achieve excellent uniformity. , Excellent surface smoothness, excellent uniformity of surface resistance

Inactive Publication Date: 2011-08-24
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the thickness uniformity and surface smoothness of the film at the fusion mark portion are poor, so that the dispersion uniformity of additives, especially conductive fillers is poor, and the quality required as an intermediate transfer belt cannot be fully satisfied.
For example, the fusion line part contained in the film produced by the above-mentioned coat hanger mold, in particular, the thickness of the fusion line part is 5% or even 8% thicker than other parts on the circumference, in the film containing at least polyphenylene sulfide and nylon. When a resin composition is used as a raw material, it is particularly difficult to form a film with a uniform thickness
If an intermediate transfer belt composed of such a film is used for image formation, image impurities after transfer to recording paper due to protrusions on the intermediate transfer belt, local resistance, and film thickness uniformity, transfer efficiency Inferior phenomenon

Method used

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  • Seamless belt forming die and manufacturing method thereof
  • Seamless belt forming die and manufacturing method thereof
  • Seamless belt forming die and manufacturing method thereof

Examples

Experimental program
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no. 1 example

[0093] use has Figure 4 The molding die shown is 1 of the figure 1 The shown seamless belt manufacturing apparatus 10 is used to manufacture an intermediate transfer belt. In more detail, 84.7 parts by weight of polyphenylene sulfide (E2180; manufactured by Toray Corporation), 6.0 parts by weight of nylon resin (polyamide resin CM1021T; manufactured by Toray Corporation), and 9.3 parts by weight of acid carbon black (Printex U; manufactured by Ebonic Degusa Corporation) The mixture is put into the raw material input port 6 of the extruder 4, and the mixture is melted and mixed by the extruder 4, and then extruded, and the extruded molten resin is further injected from the resin injection pipe 2 through the gear pump to the prescribed molding machine. The resin injection port 41 of the mold 1 . Various conditions of the molding die 1 are shown in Table 1. The stopper 52 is provided at a predetermined position in the hanger-shaped resin flow path by predetermined groove for...

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PUM

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Abstract

The invention provides a seamless belt forming die and a manufacturing method thereof capable of inhibiting the generation of fusion traces of a resin interflow portion. The seamless belt forming die comprises an inner core rod (21), an outer core rod (31) and a resin inlet (41) for injecting fusion resin inside the gap between the inner core rod (21) and the outer core rod (31). The outer circumferential surface of the inner core rod (21) is equipped with a hanger type resin flow path (51) for the diffusion of the injected fusion resin in the gap between the inner core rod (21) and the outer core rod (31) along the circumferential direction thereof. With the shaft of the inner core rod (21) as the center, the S part of the hanger type resin flow path (51) at the approximately opposite direction of the resin inlet (41) is equipped with a flow-stopping part (52) for stopping the flowing of the resin inside the flow path. The circumferential length t1 of the flow-stopping part (52) is 0.050-0.400% of the length of the outer circumference L of the inner core rod (21).

Description

technical field [0001] The present invention relates to a molding die and method for manufacturing an endless seamless belt by extrusion molding a thermoplastic resin. In particular, the present invention relates to a molding die and a method for manufacturing a seamless belt having properties such as an intermediate transfer belt suitable for use in image forming devices such as electrophotographic copiers and printers. Background technique [0002] In a conventional electrophotographic image forming apparatus such as a copier or a printer, a photoreceptor is uniformly charged and an image on the photoreceptor is exposed to form a latent image. Then, the formed image latent image is developed with toner to form an image toner image, and the toner image is transferred to the intermediate transfer belt, and then transferred to the recording medium. The toner image is heated and fixed to form an image. [0003] Since the intermediate transfer belt temporarily holds the toner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/20B29L29/00B29C48/32
Inventor 古泽克巳仓地育夫
Owner KONICA MINOLTA BUSINESS TECH INC
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