Method of producing molded articles

• US 6,007,765 A
• Filed: 12/19/1997
• Issued: 12/28/1999
• Est. Priority Date: 04/21/1995
• Status: Expired due to Fees

• Current Assignee: Exori-Import-Export GmbH & Company KG
• Original Assignee: Exori-Import-Export GmbH & Company KG
• Inventors: Oversberg, Hans-Hermann
• Primary Examiner(s): MAI, NGOCLAN THI
• Application Number:
  US08/930,130
• Time in Patent Office: 739 Days
• Field of Search: 419/10, 419/65, 419/66, 588/6-8, 588/11, 588/256
• US Class Current: 419/10
• CPC Class Codes: B22F 8/00 Manufacture of articles from scrap or waste metal particles
• CPC Class Codes: B27N 3/00 Manufacture of substantially flat articles, e.g. boards, from particles or fibres
• CPC Class Codes: B27N 3/007 and at least partly composed of recycled material
• CPC Class Codes: B29C 41/14 Dipping a core B29C41/10 takes precedence
• CPC Class Codes: B29C 41/20 incorporating preformed parts or layers, e.g. moulding inserts or for coating articles
• CPC Class Codes: B29C 67/02 Moulding by agglomerating B29C67/20 takes precedence
• CPC Class Codes: C22C 32/0094 with organic materials as the main non-metallic constituent, e.g. resin
• CPC Class Codes: Y02P 10/20 Recycling
• CPC Class Codes: Y02W 30/50 Reuse, recycling or recovery technologies

Abstract

A method of producing molded articles is provided. Raw materials that have been reduced in size are mixed together, are prepared with at least one binder, are pressed into molds, and are hardened.

Claims

1. A method of producing a molded article, including the steps of:

mixing together raw materials in the form of metals that have been reduced in size to form a mixture;

preparing said mixture with at least one binder;

pressing the prepared mixture into a mold;

hardening said mixture; and

coating with polymeric material a molded article resulting from said hardening step.

2. A method according to claim 1, wherein said binder is selected from the group consisting of water glass, paraffin, and thermoplastics.

3. A method according to claim 1, wherein said raw materials are mixed together in a dry state.

4. A method according to claim 1, wherein raw materials having varying grain sizes are used.

5. A method according to claim 1, wherein a permanent mold is used as said mold.

6. A method according to claim 1, wherein said pressing step is effected with compressed air.

7. A method according to claim 1, wherein at least on insert is disposed in said mold.

8. A method according to claim 1, wherein said hardening step is effected by means of gasification.

9. A method according to claim 8, wherein CO₂ is utilized for said gasification.

10. A method according to claim 1, wherein a molded article that results from said hardening step is subjected to further hardening.

11. A method according to claim 10, wherein said further hardening is effected by an annealing operation.

12. A method according to claim 1, wherein said preparing step comprises providing up to 20% water glass.

13. A method according to claim 1, wherein said pressing step is effected with a core shooter or core-forming machine.

14. A method according to claim 1, wherein said preparing step results in an exothermic reaction.

15. A molded article produced by the method of claim 1, wherein said molded article has a density of between 5 and 6.