US2998622A - Apparatus for pressing gramophone records - Google Patents

Apparatus for pressing gramophone records Download PDF

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Publication number
US2998622A
US2998622A US77021458A US2998622A US 2998622 A US2998622 A US 2998622A US 77021458 A US77021458 A US 77021458A US 2998622 A US2998622 A US 2998622A
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United States
Prior art keywords
sheet
mold
die
hoop
recess
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Expired - Lifetime
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Inventor
Renoux Robert Albert
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APPLIC IND PLASTIQUES SOC D
D'APPLICATIONS INDUSTRIELLES PLASTIQUES Ste
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APPLIC IND PLASTIQUES SOC D
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Priority to FR2998622X priority Critical
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Publication of US2998622A publication Critical patent/US2998622A/en
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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
    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00Carriers for sound or information
    • B29L2017/001Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003Records or discs
    • 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
    • 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
    • Y10S425/81Sound record
    • 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
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8821With simple rectilinear reciprocating motion only
    • Y10T83/8835And means to move cooperating cutting member

Description

Sept. 5, 1961 R. A. RENoux APPARATUS FOR PRESSING GRAMOPHONE RECORDS Filed Oct. 28, 1958 United States Patent APPARATUS FOR PRESSING GRAMOPHONE RECORDS Robert Albert Renoux, Paris, France, assignor to Societe dApplications lndustrielles Plastiques, Sartronville (Seine-and- Oise), France, a company of France Filed Oct. 28, 1958, Ser. No. 770,214 Claims priority, application France Dec. 23, 195.7
Y 12 Claims. (Cl. 18-5.3)
The present invention has for its object means for the execution of gramophone records and covers more particularly an arrangement of this type intended chiefly but not exclusively for the pressing or molding of very thin records.
The molds generally used for holding the dies intended for the pressing of records are constituted by steel plates, the cooperating central sections of which are recessed and polished, so as to match the diameter of the dies and to form facings for the latter; said dies are held axially by a core and peripherally by a hoop. The pressure of the molding press is thus transmitted to the record through the agency of rigidly interengaging steel surfaces.
Such prior structures lead to serious drawbacks when the record to be pressed is very thin and, consequently, very brittle. Furthermore. they do not allow obtaining with a high accuracy :1 parallelism between the dies by reason of the very small record thicknesses to be obtained. Furthermore, said record being obtained through the pressing of a strip of plastic material, it is also necessary to resort to a cutting step for separating the record from the original strip, which cutting step has been performed hitherto as a separate operation inside a special machine.
The present invention has for its object an arrangement for pressing records even of an extremely reduced thickness with a high accuracy as to constancy of thickncss. while obtaining through the same operation the cutting of the records which have been pressed.
A pressing machine according to the invention includes between the mold and a die a layer of rubber or the like deformable non'compressible material, the deformation of which in a direction parallel with the plane of the'die is prevented.
Preferably, a rubber sheet fitted without any clearance inside the mold of the press is used for carrying the die.
According to a further feature of the invention, the
hoop holding fast the periphery of the die rests together with the latter on the same sheet of rubber and the hoop thus fitted in the mold cooperates with the hoop of the opposite mold section, so as to form cutting means adapted to separate the record from the remainder of the plastic strip out of which it has been formed, or else it prepares such a separation by marking a dotted or the like line of separation.
' When such an arrangement is intended for the pressing of only one surface of very thin records, the die corresponding to the other surface is replaced by a rubber disc.
The core of the other die or of both dies, if any, may carry a thin plate in which are provided perforated inscriptions and engaging an inking block. Under the action of the pressure exerted, the material forming the record bears against the inking block through the perforations in said plate, which allows in particular printing the title of the record during the pressing of the latter.
Further features of the invention will appear in the reading of the following description, reference being made to the accompanying drawing, given byway of example and by no means in a binding sense. The single figure of said drawing is a transverse elevational view of a preferred embodiment of the invention.
- Said embodiment is intended more particularly for the production of a single surface record out of a very thin strip of plastic material. The upper mold section I carrying the upper die and the lower mold section 2 carrying the lower die are constituted each by a steel plate. Inside the upper section 1 is formed, for instance on a lathe, the location of the actual die 3 engaging the smooth surface 4 thus obtained. At the center of said smooth surface 4 is provided a recess housing the core 5 holding the die in position. A groove 6 at the periphcry of the smooth surface 4 carries a hoop 7 having a cutting edge 8 and holding the die in position through its lower inturned lip 9 facing away from said cutting edge 8. Said hoop 7 is provided with a transverse cross-section in the shape of an L, so that it may be engaged by a blank-clamping member 10 held in position by a blade spring 11 fitted in the peripheral portion of the mold section 1.
' The core 5 is provided at its inner end with a grid 12 adapted to form the letters constituting the title' of the record and to the rear of said grid is positioned a plate 13 of inked porous material engaging the bottom flange 14 of the core, the whole core arrangementbeing held by a nut 15 engaging the outer side of the inner periphery of the mold sections 1 carrying the core.
The lower mold plate 2 is provided with a central recess 16, the diameter of which is equal to the outer diameter of the annular blank-clamping member 10 and a sheet of rubber 17 is fitted inside said recess 16 without any .radial clearance with reference thereto. 'Over the periphery of said rubber sheet is laid the movable cutting hoop 18, the outer edge of which is provided with arabbet 19. Said hoop is fitted around a steel disc20 over which is laid in its turn a sheet of rubber 21, the
upper surface of which is accurately coplanar, with the upper surface of the hoop 18. Lastly, a punch 22 is arranged coaxially with the disc 20 through which it passes in order to form the central opening of the record.
The arrangement described operates as follows: when the very thin strip of material 23 is fed between the two sections of the mold and is subjected between the latter to pressure, the blank-clamping member 10 collapses, so that only the actual die engages the strip of material; the rubber sheet 21 which is non-compressible matches the slightest details of the die and this leads, without any risk of tearing of the plastic film, to a high grade of pressing. r
This rubber sheet21 which cannot be deformed-in a direction parallel to its own plane transmits the thrust to which it is subjected to the lower sheet of rubber 17 through the agency of the steel disc 20. Said sheet 17 which cannot expand in a direction parallel with its plane is deformed in a direction perpendicular to the latter in i its area underlying the movable hoop 18. The latter urges upwardly the clamping member 10 against the pressure of the spring 11 and enters slightly inwardly of the recess formed in the stationary hoop 7. The record is thus cut out required. The movable hoop 18 abuts them against the bottom of the recess in the stationary hoop 7 and is subjected by the latter to a counter-pressure which it transmits to the sheet of rubber 21, the pressure exerted on the latter being proportional thereto, the ratio 7 between the pressures being equal to the ratio between the compressed surfaces. The pressing operation on the film or strip 23 is thus brought to an end, the die being subjected to a pressure higher than the originally applied pressure.
During the pressing operation which has been described, the rubber sheet 21 urges the film 23 against the grid 12. The material forming the film 23 projects through the perforations in the latter, so as to produce the desired Patented Sept. 5, 1961 inscription, the letters formed engaging the inner surface of the porous block 13. The upper surfaces of said letters are thus inked, so as to form the desired inscription on the record.
As apparent from inspection of the drawing, the block 13 may be fed with ink through the channel 24. Obviously, the embodiment of the invention which has just been described has been given solely by way of example and by no means in a limiting sense and various detail modifications may be brought thereto without unduly widening the scope of the invention as defined in the accompanying claims.
What I claim is:
1. An arrangement for pressing gramophone records comprising two mold sections, a metal plate carried by one of said mold sections and facing a recess formed in the second mold section, a second plate in the said recess of said second mold section, at least one of said plates being a pressing die plate, means for feeding a strip of thin material between the two mold sections for molding a record therein between the two plates, a sheet of deformable non-compressible material inserted between one of the plates and the bottom of the recess in the corresponding mold section, means for holding said lastmentioned sheet peripherally to prevent any deformation thereof in a direction parallel with its own plane, and means for cutting said thin material into record shapes as said material is pressed.
2. An arrangement for pressing gramophone records comprising two mold sections, a metal plate carried by one of said mold sections and facing a recess formed in the second mold section, a second plate in the said recess of said second mold section, at least one of said plates being a pressing die plate, means for feeding a strip of thin material between the two mold sections for molding a record therein between the two plates, at deformable non-compressible rubber sheet inserted between the plate in said recess and the bottom of the said recess in the corresponding mold section without any clearance between the outer periphery of said rubber sheet and the wall of said recess, and means for cutting said thin material into record shapes as said material is pressed.
3. An arrangment for pressing grarnophone records comprising two mold sections, a metal plate carried by one of said mold sections and facing a recess formed in the second mold section, a second plate in the said recess of said second mold section, at least one of said plates being a pressing die plate, means for feeding a strip of thin material between the two mold sections for molding a record therein between the two plates, a deformable non-compressible rubber sheet greater in diameter than one of said plates inserted between the said one of the plates in said recess and the bottom of the said recess in the corresponding section of the mold without any clearance between the outer periphery of said sheet and the wall of said recess, a hoop surrounding said last-mentioned plate and resting on said deformable non-compressible rubber sheet, and means forming a cutting surface on the die carrying mold section coacting with said hoop.
4. An arrangement for pressing gramophone records comprising two mold sections, a metal plate carried by one ofsaid mold sections and facing a recess formed in the second mold section, a second plate in the said recess of said second mold section, at least one of said plates being a pressing die plate, means for feeding a strip of thin material between the two mold sections for molding a record therein between the two plates, a sheet of deformable non-compressible material inserted between one of the plates and the bottom of the recess in the corre sponding mold section, means holding said sheet peripherally to prevent any deformation thereof in a direction parallel to its own plane, and a hoop fitted inside each recess and having its inner circular surface juxtaposed to its corresponding plate, the said two hoops being shaped for relative vertical motion when said mold sections are brought together, so as to form a cutting device adapted to engage the line defining the record to be obtained out of the strip and to cut out the record along said line.
5. An arrangement for pressing gramophone records out of a film, comprising two mold sections, a die carried by one of said mold sections and facing a recess formed in the second mold section, means for feeding a film of thin plastic material between the two mold sections for producing a record therein in registry with the die, a sheet of deformable non-compressible material fitted without any clearance inside the recess of said second mold section, a presser plate smaller in diameter than said sheet laid over said sheet in registry with the location of the die in the first mold section, a further sheet of deformable non-compressible material laid over said presser plate and coextensive with the latter, means for holding the said last deformable sheet peripherally to prevent any deformation thereof in a direction parallel with its own plane, and means for cutting said thin material into record shapes as said material is pressed.
6. An arrangement for pressing gramophone records out of a film comprising two mold sections, a die carried by one of said mold sections and facing a recess formed in the second mold section, means for feeding a film of thin plastic material between the two mold sections for producing a record therein in registry with the die, a sheet of deformable non-compressible material fitted without any clearance inside the recess in said second mold section, a presser plate smaller in diameter than said sheet laid over said sheet in registry with the location of the die in the first mold section, a further sheet of deformable non-compressible material laid over said presser plate and coextensive with the latter, a hoop fitted around said presser plate and second sheet and holding fast the periphery of the said second sheet from extending beyond said presser plate to prevent anw radial deformation of said second sheet, and means for cutting said thin material into record shapes as said material is pressed.
7. An arrangement for pressing gramophone records out of a film comprising two mold sections, a die carried by one of said mold sections and facing a recess formed in the second mold section, means for feeding a continuous film of thin plastic material between the two mold sections for producing a record therein in registry with the die, a sheet of deformable non-compressible material fitted without any clearance inside the recess in said second mold section, a presser plate smaller in diameter than said sheet laid over said sheet in registry with the location of the die in the first mold section, a further sheet of compressible non-deformable material laid over said pressure plate and coextensive with the latter, a hoop fitted about said presser plate and said second sheet and holding fast the periphery of the second sheet from one tending beyond said presser plate to prevent any radial deformation of said second sheet, a hoop surrounding the die and having a cutting surface cooperating with said hoop in the second mold section during the stamping operation to cut the formed record out of the film.
8. An arrangement for pressing gramophone records out of a film comprising two mold sections, a die carried by one of said mold sections and facing a recess formed in the second mold section, means for feeding a continuous film of thin plastic material between the two mold sections for producing a record therein in registry with the die, a sheet of deformable non-compressible material fitted without any clearance inside the recess in said second mold section, a presser plate smaller in diameter than said sheet laid over said sheet in registry with the location of the die in the first mold section, a further sheet of deformable non-compressible material laid over said presser plate and coextensive with the latter, a hoop fitted about said plate and the periphery of said last deformable sheet with the outer circumferential surface of said hoop against the outer periphery of the recess in said second mold section to be confined thcreby, said hoop resting on the first sheet of deformable non-compressible material and preventing any deformation of the last mentioned deformable sheet peripherally thereof in 'a direction parallel with the plane of said last deformable sheet, and means on said die carrying mold section coacting with said hoop to cut a record circumference as a record is pressed.
9. An arrangement for pressing gramophone records out of a film comprising two mold sections, a die carried by. one of said mold sections and facing a recess formed in the second mold section, means for feeding a continuous film of thin plastic material between the two mold sections for producing a record therein in registry with the die, a sheet of deformable non-compressible material fitted without any clearance inside the recess in said second mold section, a presser plate smaller in diameter than said sheet laid over said sheet in registry with the location of the die in the first mold section, a further sheet of deformable non-compressible material laid over said presser plate and coextensive with the latter, a hoop fitted about said plate and the periphery of said last deformable sheet with the outer circumferential surface of said hoop against the outer periphery of the recess in said second mold section to be confined thereby, said hoop resting on the first sheet of deformable non-compressible material and preventing any deformation of the last mentioned deformable sheet peripherally thereof in a direction parallel with the plane of said last deformable sheet, a second hoop fitted about the die of the first mold section, and having a depression and a cutting edge, and a portion of the first hoop riding into said depression of said second hoop and coacting with said cutting edge for cutting the record to the required diameter.
10. An arrangement for pressing gramophone records out of a film, comprising two mold sections, a die carried by one of said mold sections, means for feeding a film of thin plastic material between the two mold sections for producing a record therein in registry with the die, a presser plate smaller in diameter than said recess positioned in the recess of the second mold section in registry with the location ofthe die, a sheet of deformable non-compressible material laid over said presser plate and coextensive with the latter, a hoop fitted about said plate and the periphery of said deformable sheet with the outer circumferential surface of said hoop against the outer periphery of the recess, said hoop preventing any deformation of the deformable sheet peripherally thereof in a direction parallel with the plane of said deformable sheet, and means on said die carrying mold section coacting with said hoop to cut a record circumference as a record is pressed.
11. An arrangement for pressing gramophone records out of a film, comprising two mold sections, a die carried any clearance inside a recess in the other of said mold s:ctions, a presser plate smaller in diameter than said sheet laid over said sheet in registry with the location of the die, a further sheet of deformable non-compressible material laid over said pressure plate and coextensive with the latter, a hoop fitted about said plate and the periphery of said last deformable sheet with the outer circumferential surface of said hoop against the outer periphery of the recess, said hoop resting on the first sheet of deformable non-compressible material and preventing any deformation of the last mentioned deformable sheet peripherally thereof in a direction parallel with the plane of said last deformable sheet, and means forming a circumferential slot in said die carrying mold section into which said hoop rides when said mold sections are brought together whereby to effect cutting of said film into the shape of a record.
12. An arrangement for pressing gramophone records out of a film, comprisingtwo mold sections, a die carried by one of said mold sections, means forfeeding a film' of thin plastic material between the two mold sections for producing a record in registry with the die, a sheet of deformable non-compressible material fitted without any clearance inside a recess formed in the other of said mold sections, die coacting means supported on said sheet in registry with the location of the die, a retainer hoop fitted about said means and resting on the sheet of deformable non-compressible material, and meansforming a circumferential slot in said die carrying mold section into which said hoop rideswhen said mold sections are brought together whereby to effect cutting of said film into the shape of a record.
References Cited in the file of this patent UNITED STATES PATENTS
US77021458 1957-12-23 1958-10-28 Apparatus for pressing gramophone records Expired - Lifetime US2998622A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221367A (en) * 1962-10-19 1965-12-07 Gerard C Cavalier Phonograph record pressing machines
US3577594A (en) * 1968-12-30 1971-05-04 Monsanto Co Apparatus for forming hollow articles
US3819315A (en) * 1973-01-09 1974-06-25 Ted Bildplatten Apparatus for stamping information carriers from a plastic foil
US3860382A (en) * 1972-02-23 1975-01-14 Decca Ltd Apparatus for the manufacture of contoured records
US3918875A (en) * 1973-11-22 1975-11-11 Decca Ltd Record making press
US4032610A (en) * 1972-02-23 1977-06-28 Decca Limited Manufacture of contoured records
US4219321A (en) * 1978-12-21 1980-08-26 U.S. Philips Corporation Device for making discs
US4231730A (en) * 1978-11-25 1980-11-04 E M I Limited Moulding video discs
US4243367A (en) * 1978-11-16 1981-01-06 Societe Anonyme De Techniques Audio-Visuelles S.A.T.A.V. Device for pressing objects made from a thermoplastic material, and particularly phonographic records
US4315723A (en) * 1979-09-06 1982-02-16 Thomson-Csf Device for molding information-carrying disks
US4415138A (en) * 1973-10-15 1983-11-15 Discovision Associates Elastomeric videodisc mold
US4741689A (en) * 1985-11-01 1988-05-03 Daicel Chemical Industries, Ltd. Injection mold for an optical disk
US5692406A (en) * 1996-09-27 1997-12-02 Mcdonnell Douglas Corporation Gas inlet for a superplastic forming die and method of use

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US878513A (en) * 1905-06-29 1908-02-11 American Graphophone Co Yielding matrix for sound-records.
US941291A (en) * 1908-01-29 1909-11-23 Victor Talking Machine Co Apparatus for making sound-records for talking-machines.
US1415018A (en) * 1921-04-27 1922-05-09 Fed Products Company Die press
US1481743A (en) * 1921-05-06 1924-01-22 Columbia Graphophone Mfg Co Method and apparatus for pressing disk sound records without the aid of heating and cooling mediums
GB350985A (en) * 1929-10-03 1931-05-28 Wellit Ges Pless & Co A record and a process for the manufacture thereof
US1879555A (en) * 1930-10-09 1932-09-27 Eckley M Simmons Method and machine for cutting and forming plates and other articles
US2351475A (en) * 1941-10-28 1944-06-13 Armstrong Cork Co Method and apparatus for shaping and shearing sheet materials
FR948849A (en) * 1947-06-21 1949-08-11 Le Joint Metalloplastique Fran Improvements in metal cutting and others
US2601700A (en) * 1950-06-20 1952-07-01 Plax Corp Apparatus for molding plastic bottles
US2796634A (en) * 1953-12-21 1957-06-25 Ibm Reverse forming process for making shaped articles from plastic sheet material
US2862233A (en) * 1956-04-23 1958-12-02 Jack G Brown Method and apparatus for the manufacture of phonograph records

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US878513A (en) * 1905-06-29 1908-02-11 American Graphophone Co Yielding matrix for sound-records.
US941291A (en) * 1908-01-29 1909-11-23 Victor Talking Machine Co Apparatus for making sound-records for talking-machines.
US1415018A (en) * 1921-04-27 1922-05-09 Fed Products Company Die press
US1481743A (en) * 1921-05-06 1924-01-22 Columbia Graphophone Mfg Co Method and apparatus for pressing disk sound records without the aid of heating and cooling mediums
GB350985A (en) * 1929-10-03 1931-05-28 Wellit Ges Pless & Co A record and a process for the manufacture thereof
US1879555A (en) * 1930-10-09 1932-09-27 Eckley M Simmons Method and machine for cutting and forming plates and other articles
US2351475A (en) * 1941-10-28 1944-06-13 Armstrong Cork Co Method and apparatus for shaping and shearing sheet materials
FR948849A (en) * 1947-06-21 1949-08-11 Le Joint Metalloplastique Fran Improvements in metal cutting and others
US2601700A (en) * 1950-06-20 1952-07-01 Plax Corp Apparatus for molding plastic bottles
US2796634A (en) * 1953-12-21 1957-06-25 Ibm Reverse forming process for making shaped articles from plastic sheet material
US2862233A (en) * 1956-04-23 1958-12-02 Jack G Brown Method and apparatus for the manufacture of phonograph records

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221367A (en) * 1962-10-19 1965-12-07 Gerard C Cavalier Phonograph record pressing machines
US3577594A (en) * 1968-12-30 1971-05-04 Monsanto Co Apparatus for forming hollow articles
US3860382A (en) * 1972-02-23 1975-01-14 Decca Ltd Apparatus for the manufacture of contoured records
US4032610A (en) * 1972-02-23 1977-06-28 Decca Limited Manufacture of contoured records
US3819315A (en) * 1973-01-09 1974-06-25 Ted Bildplatten Apparatus for stamping information carriers from a plastic foil
US4415138A (en) * 1973-10-15 1983-11-15 Discovision Associates Elastomeric videodisc mold
US3918875A (en) * 1973-11-22 1975-11-11 Decca Ltd Record making press
US4243367A (en) * 1978-11-16 1981-01-06 Societe Anonyme De Techniques Audio-Visuelles S.A.T.A.V. Device for pressing objects made from a thermoplastic material, and particularly phonographic records
US4231730A (en) * 1978-11-25 1980-11-04 E M I Limited Moulding video discs
US4219321A (en) * 1978-12-21 1980-08-26 U.S. Philips Corporation Device for making discs
US4315723A (en) * 1979-09-06 1982-02-16 Thomson-Csf Device for molding information-carrying disks
US4741689A (en) * 1985-11-01 1988-05-03 Daicel Chemical Industries, Ltd. Injection mold for an optical disk
US5692406A (en) * 1996-09-27 1997-12-02 Mcdonnell Douglas Corporation Gas inlet for a superplastic forming die and method of use

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