US2367779A - Apparatus for forming materials - Google Patents

Apparatus for forming materials Download PDF

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Publication number
US2367779A
US2367779A US49584443A US2367779A US 2367779 A US2367779 A US 2367779A US 49584443 A US49584443 A US 49584443A US 2367779 A US2367779 A US 2367779A
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Prior art keywords
sheet
pressure
forming
material
chamber
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Charles J Hull
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Wurlitzer Co
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Wurlitzer Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26Component parts, details or accessories; Auxiliary operations
    • B29C51/28Component parts, details or accessories; Auxiliary operations for applying pressure through the wall of an inflated bag or diaphragm
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/12Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/019Flexible fluid pressure

Description

Jan. 23, 1945. J L

' APPARATUS FOR FORMING MATERIALS Filed July 23 1943 Ill-III 11 1 III IJIIIJJIIIJIIIIIIII-- Illllllllll I INVENTOR.

Patented Jan. 23, 1945 APPARATUS FOR FORMING MATERIALS Charles J. Hull, Kenmore, N. Y., assignor to The Rudolph Wurlitzer Company, Chicago, 111., a

corporation Application July 23,1943, Serial No. 495,844

Claims. (01. 18-19) This invention relates to an apparatus for molding sheet plastics, paper, wood, cloth and the like, and particularly that type of material which may be molded'and formed with the application of in association with a flexible sheet, such as rub-.

her, for compresing the material therebetween under equalized high fluid pressiu'e, as more specifically set forth and described in an application of Edward C. Sloan heretofore filed March 22,

1943, Serial No. 480,049, entitled "Method and apparatus for forming materials."

The apparatus comprising this invention includes an arrangement for preventing deterioration of the rubber or rubber composition forming the flexible sheet as a result of the direct application of steam and heat. It is, therefore, the purpose of this invention to protect the rubber or similar composition of the flexible sheet by avoiding the direct application of steam or a heated fluid in building up the fluid pressure thereon. This is accomplished by filling the pressure chamber embodying said sheet with a fluid, such as water or oil, and Ma temperature such as will have no deleterious effect thereon, and whereby said fluid in turn is placed under a pressure to be transmitted thereby to the sheet. In utilizing this invention the heat transfer to and from the material being formed is accomplished through the medium of the metal forming sheet by reason of its high conductivity.

The full nature of .the invention will be understood from the accompanying drawing and the following description and claims:

Fig. l is an illustrative sectional view showing the material being compressed between the sheets within a pressure vessel. Fig. 2 is an enlarged section through a portion of the vessel showing the sheets secured to the respective sections thereof.

In the drawing there is illustrated a pressure vessel l0 having a lower section supported by legs I I and an upper section removably clamped on the lower section by clamps l2. Removably mounted and sealed within the upper section of the vessel there is a rigid forming sheet which consists of a sheet metal die I3. This forming sheet is given any desired shape to which the I material is to be formed. It is only of sufllcient terial. Its lightness and thinness has the advantage of permitting rapid heat transmission to the material formed thereby, as well as the advantage of conveniently and economically forming to various shapes. Thus, said forming sheet in conjunction with the upper section of said vessel encloses a pressure chamber ll.

Removably mounted, but sealed to the lower section to thereby form a pressure chamber l5, there is a flexible conforming sheet it which may be of rubber or rubber composition. This sheet is preferably molded substantially in conformity with the metal forming sheet l3.

The material II to be formed is placed between said sheets and the sections of the vessel are clamped together for the forming operation. High pressure is then applied to compress the material between said sheets and cause it to take the form and set according to the shape of the forming member III by the application of equalizing fluid pressure in the pressure chambers l4, l5. Sinceor deformed as a result of extremely high pressure being applied to the material between the sheets, the flexible conforming sheet being adapted to take the form of the forming sheet and iron. out,

the material into the desired form. At the same time the high pressure will compress the material thus formed to give it high density and set it to form.

The metal forming sheet I3 is secured to arin 18 adapted to be mounted within the upper section of the vessel and removably secured therein in sealed relation with a supporting ring l9 se-I cured to the inner wall thereof. The flexible conforming sheet I6 is secured to a". ring 20 adapted to be seated within said vessel on a ring 2| secured to the inner wall thereof. Thus, each of said sheets may be conveniently removed or replaced within their respective sections and sealed therein to provide the fluid tight pressure chambers l4 and I5.

The pressure chamber I5 is filled with a suitable liquid, such as water or glycerin, from a liquid storage tank 21 having a connection with said chamber I! through an inlet pipe 21. A valve controlled vent 24 is also provided for communication with the upper part of said chamber through a flexible tubing 25 so arranged as to be floated or suspended with its intake in the upper part of the chamber for venting entrapped air. The liquid storage tank 22 contains suflicient liquid to more than flll the chamber while still retaining a high level of the liquid therein.- The top of said storage chamber is connected with a stream and water supply line 28 to which the upper pressure chamber i4 is connectedvby a flexible hose 21. Similarly, the upper chamber may be exhausted of the fluid under pressure through a flexible hose 28 connected with a vent 28 and drain III. The lower portion or the chamber I is also connected with the drain it through a pipe 3|.

By reason .of the flexible hose connections with the upper section of said vessel, it may be readily removed from the' lower section to permit placement of the material therebetween and removable therefrom after i'orming. In forming the material placed between the two sheets, and with the lower pressure chamber i5 substantially but not entirely fllled with liquid from the storage tank 22, steam may be applied to the storage tank and the upper pressure chamber ll. The steam pressure so applied may be raised to any desired amount, such pressure venting any air in the chamber l5 and forcing the conformin flexible sheet and the material engaged thereby against the forming sheet. The equalized pressure on the forming sheet will act to maintainv its shape and prevent collapse while'the steam introduced transmitsth required heat to the material therethrou'gh. However, by reason of introducing the liquid storage tank 22 between the steam pipe and the chamber II, such steam and heat will not be directly applied to the flexible rubber sheet. Thus, it will be protected from the effects of the steam and heat by the interposed liquid in the chamber on the one side and the insulating characteristics of the material being formed on the other side.

The invention claimed is:

1., Apparatus for forming material involving the application of pressure and heat exchange,

including a forming die comprising a thin preformed rigid forming sheet, a complementary rubber conforming sheet, said sheets being adapted to embrace the material, to be. compressed to the form of said forming sheet, a liquid returning receptacle associated with said conforming sheet, a, liquid containing storage tank in communication with said receptacle, and means for applying equalized fluid pressure to said forming sheet and the liquid in said tank.

2. Apparatus for forming material involving including'a formin die comprising'a thin preassure formed rigid forming sheet, said sheet forming a closure portion of a" pressure chamber, a rubber conforming sheet adapted with said forming sheet to compress and form .said material therebetween, a pressure chamber adapted to contain a liquid and associated with said conforming sheet, a liquid storage tank communicating with said last-mentioned chamber, and means for applying equalized fluid pressure to said flrst-mem tioned chamber and tank.

3. Apparatus for forming material involving the application of pressure and heat exchange, including a vessel of opposed separable sections, a forming die comprising a thin preformed rigid forming sheet sealed within one of said sections to enclose a pressure chamber, arubber conforming sheet sealed within the opposed section to v enclose an equalizing pressure chamber adapted to contain a liquid unharmful to the rubber of said conforming sheet, a storage tank for said liquid in communication with said lastmentioned chamber, and a steam pressure line connected with said tank and first-mentioned pressure chamber for transmitting heat to said forming sheet and equalized fluid pressure to said chambers.

4. Apparatus for forming material involving the application of pressure and heat exchange, including a vessel of opposed separable sections, a sheet metal forming die, means for removably mounting said forming die in one of said sections to enclose a pressure chamber, a rubber conforming sheet, means for removably mounting said rubber sheet in the opposed section and sealing it therein to enclose an equalizing pressure chamber, means for securing said separable sections of the vessel together with the material to be formed extending between said die and conforming sheet, said last-mentioned pressure chamber being adapted to contain a liquid unharmiul to the rubber oi said conforming sheet, a storage tank for said liquid in communication with said last-mentioned chamber, and a steam pressure the application of pressure and heat exchange,

line connected with said tank and first-mentioned pressure chamber for transmitting heat to said metal die and equalizing the fluid pressure withinsaid chambers.

5. Apparatus for forming material involving the application of pressure and heat exchange, including a forming die comprising a thin preformed rigid iorming sheet, a complementary rubber conforming sheet, said sheets being adapted to embrace the-material to be compressed to the form of said forming sheet, a liquid retaining receptacle associated with said conforming sheet with the liquid in direct contact therewith, and means for applying equalized fluid pressure to said forming sheet and the liquid retained in said receptacle, whereby said pressure will be transmitted through the medium oi said liquid to the conforming sheet.

', CHAR.LESJ.HUIL.

US2367779A 1943-07-23 1943-07-23 Apparatus for forming materials Expired - Lifetime US2367779A (en)

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446041A (en) * 1945-09-06 1948-07-27 Lloyd H Blanchard Plastic molding press
US2478165A (en) * 1946-05-24 1949-08-02 Owens Corning Fiberglass Corp Low-pressure molding apparatus
US2517090A (en) * 1946-11-09 1950-08-01 F E Schundler & Co Inc Method of molding magnesite products
US2686552A (en) * 1950-02-15 1954-08-17 Time Inc Apparatus for bonding laminae of laminated printing plates
US2706309A (en) * 1949-10-08 1955-04-19 Northrop Aircraft Inc Means of forming patterns and molds
US2908039A (en) * 1956-07-25 1959-10-13 Pastushin Aviat Corp Apparatus for producing objects of cured plastic material
US2972432A (en) * 1958-02-27 1961-02-21 Lily Tulip Cup Corp Flexible thermoplastic nestable closure lids
US2982996A (en) * 1953-05-22 1961-05-09 Zenith Plastics Company Apparatus for metal spray molds
US2984870A (en) * 1957-10-09 1961-05-23 Studebaker Packard Corp Method of forming a prestressed hollow article
US3131426A (en) * 1961-04-25 1964-05-05 Dow Chemical Co Apparatus for curing foamed materials
US3150412A (en) * 1961-05-31 1964-09-29 Harwood Engineering Company Radial press
US3165569A (en) * 1960-04-18 1965-01-12 Air Logisties Corp Method and apparatus for thermal expansion molding
US3177689A (en) * 1961-10-09 1965-04-13 Gen Dynamics Corp Method and apparatus for forming workpieces
US3535740A (en) * 1966-11-25 1970-10-27 Ici Ltd Apparatus for producing embossed thermoplastic sheet
US3546740A (en) * 1967-08-14 1970-12-15 Shell Oil Co Diaphragm-type sheet forming apparatus
US4104101A (en) * 1972-08-11 1978-08-01 Armen Garabedian Process for making a plastic sheet
US4243368A (en) * 1978-07-31 1981-01-06 Armen Garabedian Apparatus for making a stress-free plastic article
EP0226303A1 (en) * 1985-11-09 1987-06-24 Old Acre Engineering Company Limited Laminating press
EP0278622A2 (en) * 1987-02-09 1988-08-17 Imperial Chemical Industries Plc Shaping of syntactic foam
US5711172A (en) * 1987-04-28 1998-01-27 The Regents Of The University Of California Apparatus for preparing composite skin replacement
US5971742A (en) * 1996-09-18 1999-10-26 Pyramid Composites Manufacturing Limited Partnership Apparatus for molding composite articles
US6143215A (en) * 1996-09-18 2000-11-07 Vec Technology, Inc. Method and apparatus for molding composite articles
US6623672B2 (en) 2000-10-03 2003-09-23 Vec Technology Inc. Method and apparatus for molding composite articles
US20050079241A1 (en) * 2001-05-31 2005-04-14 John Moore Method and apparatus for molding composite articles
US6905105B2 (en) 2002-03-06 2005-06-14 University Of Cincinnati Apparatus for preparing a biocompatible matrix
US20050184416A1 (en) * 2004-01-23 2005-08-25 Mccollum Robert P. Method and apparatus for molding composite articles
US20080185754A1 (en) * 2007-01-19 2008-08-07 John Wirt Method and apparatus for molding composite articles

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446041A (en) * 1945-09-06 1948-07-27 Lloyd H Blanchard Plastic molding press
US2478165A (en) * 1946-05-24 1949-08-02 Owens Corning Fiberglass Corp Low-pressure molding apparatus
US2517090A (en) * 1946-11-09 1950-08-01 F E Schundler & Co Inc Method of molding magnesite products
US2706309A (en) * 1949-10-08 1955-04-19 Northrop Aircraft Inc Means of forming patterns and molds
US2686552A (en) * 1950-02-15 1954-08-17 Time Inc Apparatus for bonding laminae of laminated printing plates
US2982996A (en) * 1953-05-22 1961-05-09 Zenith Plastics Company Apparatus for metal spray molds
US2908039A (en) * 1956-07-25 1959-10-13 Pastushin Aviat Corp Apparatus for producing objects of cured plastic material
US2984870A (en) * 1957-10-09 1961-05-23 Studebaker Packard Corp Method of forming a prestressed hollow article
US2972432A (en) * 1958-02-27 1961-02-21 Lily Tulip Cup Corp Flexible thermoplastic nestable closure lids
US3165569A (en) * 1960-04-18 1965-01-12 Air Logisties Corp Method and apparatus for thermal expansion molding
US3131426A (en) * 1961-04-25 1964-05-05 Dow Chemical Co Apparatus for curing foamed materials
US3150412A (en) * 1961-05-31 1964-09-29 Harwood Engineering Company Radial press
US3177689A (en) * 1961-10-09 1965-04-13 Gen Dynamics Corp Method and apparatus for forming workpieces
US3535740A (en) * 1966-11-25 1970-10-27 Ici Ltd Apparatus for producing embossed thermoplastic sheet
US3546740A (en) * 1967-08-14 1970-12-15 Shell Oil Co Diaphragm-type sheet forming apparatus
US4104101A (en) * 1972-08-11 1978-08-01 Armen Garabedian Process for making a plastic sheet
US4243368A (en) * 1978-07-31 1981-01-06 Armen Garabedian Apparatus for making a stress-free plastic article
EP0226303A1 (en) * 1985-11-09 1987-06-24 Old Acre Engineering Company Limited Laminating press
EP0278622A3 (en) * 1987-02-09 1990-01-17 Imperial Chemical Industries Plc Shaping of syntactic foam
EP0278622A2 (en) * 1987-02-09 1988-08-17 Imperial Chemical Industries Plc Shaping of syntactic foam
US5711172A (en) * 1987-04-28 1998-01-27 The Regents Of The University Of California Apparatus for preparing composite skin replacement
US5971742A (en) * 1996-09-18 1999-10-26 Pyramid Composites Manufacturing Limited Partnership Apparatus for molding composite articles
US6257867B1 (en) 1996-09-18 2001-07-10 Vec Technology, Inc. Apparatus for molding composite articles
US6287493B1 (en) 1996-09-18 2001-09-11 Vec Technology, Inc. Process for molding composite articles
US6143215A (en) * 1996-09-18 2000-11-07 Vec Technology, Inc. Method and apparatus for molding composite articles
US6623672B2 (en) 2000-10-03 2003-09-23 Vec Technology Inc. Method and apparatus for molding composite articles
US20050079241A1 (en) * 2001-05-31 2005-04-14 John Moore Method and apparatus for molding composite articles
US7452720B2 (en) 2002-03-06 2008-11-18 University Of Cincinnati Apparatus for preparing a biocompatible matrix
US6905105B2 (en) 2002-03-06 2005-06-14 University Of Cincinnati Apparatus for preparing a biocompatible matrix
US20050221484A1 (en) * 2002-03-06 2005-10-06 University Of Cincinnati Apparatus for preparing a biocompatible matrix
US20090111181A1 (en) * 2002-03-06 2009-04-30 Boyce Steven T Apparatus for preparing a biocompatible matrix
US20050184416A1 (en) * 2004-01-23 2005-08-25 Mccollum Robert P. Method and apparatus for molding composite articles
US7553435B2 (en) 2004-01-23 2009-06-30 Vec Industries, L.L.C. Method and apparatus for molding composite articles
US20080185754A1 (en) * 2007-01-19 2008-08-07 John Wirt Method and apparatus for molding composite articles
US7785518B2 (en) 2007-01-19 2010-08-31 Vec Industries, L.L.C. Method and apparatus for molding composite articles
US20100327496A1 (en) * 2007-01-19 2010-12-30 Vec Industries, L.L.C. Method and apparatus for molding composite articles
US8845947B2 (en) 2007-01-19 2014-09-30 Vec Industries, L.L.C. Method and apparatus for molding composite articles

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