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Recycle methods for water based powder injection molding compounds

A technology of injection molding and composites, applied in the direction of chemical instruments and methods, manufacturing tools, control devices, etc., can solve the problem of high mold costs

Inactive Publication Date: 2006-08-30
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manufacturers generally do not want to make costly changes to their tooling, especially if the manufacturer considers such changes to be unstable
Additionally, manufacturers may be unwilling or unaware of how to make the adjustments needed to control dimensions under molded and sintered conditions

Method used

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  • Recycle methods for water based powder injection molding compounds
  • Recycle methods for water based powder injection molding compounds
  • Recycle methods for water based powder injection molding compounds

Examples

Experimental program
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Embodiment Construction

[0031] The present invention provides a process for adjusting the amount of water and the concentration of water-soluble additives in water-based injection molding compounds. The process can be used on waste material before sintering and dry virgin raw material pellets to adjust the shrinkage of the raw material. The first step in the process is preferably to expose the material to a water-based rehydration solution until an equilibrium water concentration and additive concentration is established between the material and the surrounding water. Trace amounts of additives such as calcium metaborate (treatment aid) or biocides can be added to the rehydration solution to achieve the desired balance of treatment and antimicrobial properties of the components. In the case of waste, excess water can be removed from the waste by conventional equipment and then crushed into granules.

[0032] In experiments with scrap from injection molding work, moisture balance data tested on vario...

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Abstract

A process for adjusting the level of water or water soluble additives in aqueous-based powder injection molding compounds for the purpose of recycling scrap material, controlling shrinkage or rehydrating dry feedstock. Depending on the objective, the process may require material granulation equipment, equipment for the addition or removal of water and mixing equipment. The molding compounds may be comprised of either recycled scrap material before being heat-treated or dry, virgin feedstock material.

Description

technical field [0001] The present invention relates to methods of adjusting the amount of water or water-soluble additives in water-based powder injection molding compounds for recycling waste, controlling shrinkage or rehydrating dry stock. Depending on the purpose achieved, the process requires equipment for granulating the material, equipment for adding or removing water, and mixing equipment. Background technique [0002] US patent US 4734237 discloses a process for forming parts from metal and / or ceramic powders. The disclosed process comprises forming a mixture comprising metal and / or ceramic powders; having at least about 500 g / cm 2 An agar-like forming material of colloidal strength, the strength being measured at a temperature between 0° C. and about 22° C. and on a gel substantially comprising about 4% by weight of a gel-forming material such as agar-like agar and water; and agar-like Glue-forming material solution such as water. The mixture is then molded, pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B28B1/24B28C7/04B22F8/00B22F3/02B28C7/02
CPCB28C7/0409B22F3/22B28C7/022B22F2999/00B22F2998/00B22F3/225B22F8/00B22F2203/01B22F2201/05Y02P10/20
Inventor J·F·斯蒂芬森M·贝希J·C·拉萨勒G·马斯
Owner HONEYWELL INT INC