Claims
- 1. A method of molding articles from a plastic material comprising:
- introducing said plastic material into an extruder apparatus;
- heating and mixing said plastic material to be in a fluid condition;
- maintaining said fluid plastic material free from a blowing agent;
- introducing said fluid plastic material from said extruder apparatus into a first end of a mold, said mold having an opposite end with a closure plate thereover, said closure plate having an aperture therein;
- said mold being mounted on a mold-holding frame holding a plurality of additional elongated molds;
- using a nozzle of said extruder apparatus to increase pressure in said extruder;
- sensing when said mold had been filled by automatically sensing the issuance of said plastic fluid from said aperture;
- moving said mold-holding frame as to cause said mold to move to a second station in response to sensing the issuance of plastic fluid from said aperture;
- simultaneously moving one of said additional molds into fluid communication with said extruder apparatus;
- closing both of said first and second ends while said mold is at said second station so that said fluid plastic can cool and harden;
- introducing fluid plastic material into said one additional mold at the same time that said mold is at said second station.
- 2. A method according to claim 1 and further comprising using trimming means to engage and trim the excess portions of said plastic material which have issued from said aperture of said closure plate, said trimming being flush with said closure plate and being accomplished during the time that said mold is moving to said second station.
- 3. A method according to claim 1 and further comprising screening said plastic material within said extruder apparatus before said plastic material is introduced into said mold.
- 4. A method according to claim 3 and further comprising using a heater band surrounding said nozzle of said extruder apparatus to apply heat to said plastic material.
- 5. A method according to claim 1, further comprising issuing said plastic fluid through said aperture and sensing when said plastic fluid has filled said aperture.
Parent Case Info
This is a division, of application Ser. No. 798,886, filed Nov. 18, 1985, now U.S. Pat. No. 4,626,189.
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
572261 |
Oct 1945 |
GBX |
605867 |
Aug 1948 |
GBX |
855983 |
Dec 1960 |
GBX |
1285136 |
Aug 1972 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
798886 |
Nov 1985 |
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