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US4083665: Apparatus for manufacturing a foamed article formed or pre-expanded polystyrene

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Filing Information

Inventor(s) Klaus Schnellmann · Walter Kilchenmann · Hans Ulrich Hauser ·
Assignee(s) Bucher-Guyer AG Maschinenfabrik ·
Attorney/Agent(s) Werner W. Kleeman ·
Primary Examiner Francis S. Husar ·
Assistant Examiner Mark Rosenbaum ·
Application Number US5624954
Filing date 10/22/1975
Issue date 04/11/1978
Predicted expiration date 10/22/1995
U.S. Classifications 425/144  · 236/101.R  ·
International Classifications B29D 2700  ·
Kind CodeA
International Classifications 425143;4 R;817 R;144;420;812 ·
Foreign Priority CH1458674 - 10/31/1974 ·
9 Claims, No Drawings


Abstract

An apparatus for the manufacture of a foamed molded article or part from pre-expanded polystyrene comprising a hollow mold compartment which communicates with a vapor chamber or compartment at least at the region of one of its walls by means of passageways or openings provided therein. Each passageway or opening is controlled by a valve arrangement responsive to the vapor temperature and which closes such passageway when the vapor temperature exceeds a temperature range contemplated for a limited foaming.

Independent Claims | See all claims (9)

  1. 1. An apparatus for the manufacture of a foamed molded article of plastic, especially pre-expanded polystyrene, comprising a mold provided with a hollow mold compartment, walls defining said hollow mold compartment, said hollow mold compartment being provided at least at the region of one of its walls with passageways, means within said walls defining a vapor chamber, said passageways communicating the hollow mold compartment with said vapor chamber, a valve arrangement disposed in each passageway and responsive to the vapor temperature for controlling each passageway, each valve arrangement closing its associated passageway when the vapor temperature exceeds a temperature range provided for limited foaming of the plastic molded article, each valve arrangement comprising an insert means provided with seat means provided for the associated passageway and a closure element cooperating with said seat means, said closure element having a free end surface, means for fixedly securing the closure element and insert means to one another at a location remote from said free end surface, each passageway being formed between the closure element and the seat means thereof, the material of the closure element and the inner width of the passageway are selected such that the closure element comes into contact with the seat means due to thermal expansion when the vapor temperature exceeds said temperature range and with said free end surface of said closure element expanding in the direction of said hollow mold compartment to form a surface which is substantially flush with said wall provided with said passageways, said closure element and said seat means coming out of contact with one another due to contraction of said closure element upon dissipation of the thermal energy which caused said thermal expansion.
  2. 6. An apparatus for the manufacture of a foamed molded article of plastic, especially pre-expanded polystyrene, comprising a mold provided with a hollow mold compartment, walls defining said hollow mold compartment, said hollow mold compartment being provided at least at the region of one of its walls with passageways, means within said walls defining a vapor chamber, said passageways communicating the hollow mold compartment with said vapor chamber, a valve arrangement located in each passageway and responsive to the vapor temperature for controlling each passageway, each valve arrangement closing its associated passageway when the vapor temperature exceeds a temperature range provided for limited foaming of the plastic molded article, each valve arrangement comprising seat means provided for the associated passageway and a closure element cooperating with said seat means, said closure element having a free end surface, each passageway being formed between the closure element and the seat means thereof, the material of the closure element and the inner width of the passageway are selected such that the closure element comes into contact with the seat means due to thermal expansion when the vapor temperature exceeds said temperature range, each passageway has a mouth opening into the hollow mold compartment, the closure element of each passageway when in its closed position extending into the mouth of the passageway opening into the hollow mold compartment and possessing a boundary surface defined by said free end surface which is flush with said wall of the hollow mold compartment provided with said passageways, a housing within which there is mounted the associated closure element, a wall of the hollow mold compartment being provided with recess means into which there is inserted said housing, said housing possesses a substantially pot-shaped construction, said housing having a floor, means for anchoring the closure element at the floor of the housing remote from said free end surface of said closure element.
  3. 7. An apparatus for the manufacture of a foamed molded article of plastic, especially pre-expanded polystyrene, comprising a mold provided with a hollow mold compartment, walls defining said hollow mold compartment, said hollow mold compartment being provided at least at the region of one of its walls with passageways, means within said walls defining a vapor chamber, said passageways communicating the hollow mold compartment with said vapor chamber, a valve arrangement located in each passageway and responsive to the vapor temperature for controlling each passageway, each valve arrangement closing its associated passageway when the vapor temperature exceeds a temperature range provided for limited foaming of the plastic molded article, each valve arrangement comprising seat means provided for the associated passageway and a closure element cooperating with said seat means, said closure element having a free end surface, each passageway being formed between the closure element and the seat means thereof, the material of the closure element and the inner width of the passageway are selected such that the closure element comes into contact with the seat means due to thermal expansion when the vapor temperature exceeds said temperature range, each passageway has a mouth opening into the hollow mold compartment, the closure element of each passageway when in its closed position extending into the mouth of the passageway opening into the hollow mold compartment and possessing a boundary surface defined by said free end surface which is flush with said wall of the hollow mold compartment provided with said passageways, a housing having a housing floor within which there is mounted the associated closure element, a wall of the hollow mold compartment being provided with recess means into which there is inserted said housing, means for anchoring the closure element at said housing floor at a location remote from said free end surface of said closure element, and wherein a part of the closure element confronting the housing floor possesses a stepped configuration and said housing floor at the region of the stepped configuration being provided with openings.
  4. 9.9. An apparatus for the manufacture of a foamed molded article of plastic, especially pre-expanded polystyrene, comprising a mold provided with a hollow mold compartment, walls defining said hollow mold compartment, said hollow mold compartment being provided at least at the region of one of its walls with passageways, means within said walls defining a vapor chamber, said passageways communicating the hollow mold compartment with said vapor chamber, a valve arrangement located in each passageway and responsive to the vapor temperature for controlling each passageway, each valve arrangement closing its associated passageway when the vapor temperature exceeds a temperature range provided for limited foaming of the plastic molded article, each valve arrangement comprising insert means provided with seat means provided for the associated passageway and a closure element cooperating with said seat means, said closure element having a free end surface, means for fixedly securing said closure element and insert means to one another at a location remote from said free end surface, each passageway being formed between the closure element and the seat means thereof, the material of the closure element and the inner width of the passageway are selected such that the closure element comes into contact with the seat means due to thermal expansion when the vapor temperature exceeds said temperature range and with said free end surface of said closure element expanding in the direction of said hollow mold compartment to form a surface which is substantially flush with said wall provided with said passageways, and wherein the closure element comes to bear against said seat means at a vapor temperature of about 120.degree. C.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3038664 AMERICAN RADIATOR & STANDARD Gould Jun 1962
US3193876 THOMPSON IND CO INC Thompson Jul 1965
US3263926 DOLE VALVE CO Couffer et al. Aug 1966
US3264381 KOHLER JOA CORP Stevens Aug 1966
US3515346 SANDERS ASSOCIATES INC Hayner et al. Jun 1970
US3735922 FUJIWARA K Fujiwara May 1973

Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US5098271 Ikeda Bussan Co., Ltd. Norio Yanagishita Mar 1992
US4716953 Burnswick Industrial Supply Co. Prunty, II; John E. et al. Jan 1988