Manufacture of resin forming part

A manufacturing method, resin molding technology, applied in the field of manufacturing resin molded parts, can solve the problems of low glass transition temperature and difficult to use

Inactive Publication Date: 2003-03-05
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned above, polylactic acid has no effect even if it is mixed with reinforcing fibers, and its glass transition temperature is as low as 58°C. When it exceeds 60°C, it becomes very soft, making it difficult to use in applications requiring heat resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment ( Embodiment 1

[0022] 0.1% by mass of carbon black (manufactured by Mitsubishi Chemical, #950) and 15% by mass of carbon fiber (Toho Rayon, BesphaitHTA-C6-S) were mixed in pellets of polylactic acid (manufactured by Shimadzu Corporation, Lacty9020), and The resulting mixture was dried with a vacuum dryer (120°C, 600Pa) for 6 hours, mixed with a twin-shaft mixer at 230°C, extruded into monofilaments, cooled with water, and granulated. The raw material granules obtained were dried for 4 hours with a hot air drier at 80° C., and then supplied to an injection molding machine to form a frame and an inner cover of an instant photo film pack.

[0023] Take a sample of 20 mg from the frame and inner cover, put it into the DSC measuring cell, heat it to the melting point at a heating rate of 10°C / min, then keep the temperature for 1min, then cool it at a cooling rate of 10°C / min, and measure In the DSC curve, the exothermic peak of crystallization was observed, and the exothermic peak of crystallizat...

Embodiment 2

[0032] 0.1% by mass of carbon black (manufactured by Mitsubishi Chemical, #950) and 15% by mass of glass fiber (Nittobo, Tiyopud monofilament CS6PE-403) were mixed with pellets of polylactic acid (manufactured by Shimadzu Corporation, Lacty9020) , the resulting mixture was dried with a vacuum dryer (120°C, 600Pa) for 6 hours, mixed with a twin-shaft mixer at 230°C, extruded into a monofilament, cooled with water, and granulated. After drying the obtained raw material granules with a hot air drier at 80°C for 4 hours, they were provided to an injection molding machine to be made into a frame and an inner cover of an instant photographic film pack.

[0033] As in Example 1, the DSC curves of the frame and the inner lid were measured when the temperature was lowered, and a crystallization exotherm with a peak at 94°C was observed.

[0034] Next, anneal the frame and inner cover with a hot air dryer heated to 120°C for 5 minutes. In the case and inner cover obtained in this way, ...

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PUM

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Abstract

The present invention provides a resin molded article and a production method thereof. Said resin molded article has sufficient heat resistance so that they are not deformed even after being temporarily left in a high temperature environment such as that in an automobile in the daytime in summer seasons and being heated to a high temperature, without deteriorating the properties thereof as members for recording materials, and therefore cause no environmental problems when left in nature since they can be finally decomposed by microorganisms. Said resin molded article is prepared through the processes of heat-molding a molding material containing reinforcing fiber and a biodegradable resin and annealing a molded article having a cooling crystallization peak value temperature of 80-120 DEG C at 80-165 DEG C for 0.1-30 minutes.

Description

technical field [0001] The present invention relates to a method of manufacturing a resin molded part. Background technique [0002] In parts such as containers, casings, lids, cores, or boxes for containing, packaging, covering, protecting, transporting, storing, and maintaining the shape of recording materials such as photographic recording materials, magnetic recording materials, and optical recording materials , using various resin molded parts. For example, as the functional parts for accommodating the main body of recording materials, there are boxes, film holders, film cassettes with lenses, etc., or simply used to protect recording material containers, storage boxes for audio tapes, video tapes, etc., CDs, MDs, etc. Storage box etc. Few of these recording materials are kept permanently, and most of them are discarded. At this time, resin molded parts are also discarded along with the recording materials. [0003] However, existing resin molded parts are difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/12B29B9/14B29C67/24B29C71/02
CPCB29C67/24B29C71/02B29K2995/006B29K2995/0017B29K2995/0059B29C2071/022B29B9/14B29K2067/046B29K2105/06B29B9/12Y10T428/249945Y10T428/249946
Inventor 铃木文行望月正
Owner FUJIFILM CORP
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