Laminated picture-type phonograph record,and method of making the same

Abstract

Abstract METHOD OF MAKING A LAMINATED PICTURE-TYPE PHONOGRAPH RECORD OF A PRE-FORMED OR PRE-CALENEDERED CORE SHEET OF THERMOPLASTIC SYNTHETIC RESIN WHICH IS COLORED BLACK OR ANOTHER DESIRED COLOR. DISPOSED ON EACH SIDE OF SUCH PREFORMED CORE SHEET IS A SHEET OF PAPER WHICH IS DECORATIVELY PRINTED ON THE SIDE REMOTE FROM THE CORE SHEET. TWO PREFORMED OR PRE-CALENDERED SURFACE SHEETS OF THIN, HIGHLY TRANSPARENT THERMOPLASTIC SYNTHETIC RESIN ARE MOUNTED ON THE OUTER SURFACES OF THE PRINTED SHEETS OF PAPER, AND HAVE THE PHONOGRAPH SOUND GROOVES IMPRESSED THEREIN. THE CORE SHEET AND SURFACE SHEETS EXTEND RADIALLY OUTWARDLY FROM THE PRINTED PAPER SHEETS, AND ARE SEALED TOGETHER AT THE PERIPHERY OF THE RECORD. IN ACCORDANCE WITH THE METHOD, THE CORE SHEET HAS AN OUTER DIAMETER (PRIOR TO PRESSING) APPROXIMATELY EQUAL TO (OR GREATER THAN) THE DIAMETER OF THE CIRCLE OF CONTACT OF THE RECORD PRESS, THE SHEETS OF PAPER HAVE OUTER DIAMETERS LESS THAN THE DIAMETER OF THE CIRCLE OF CONTACT, AND THE SURFACE SHEETS HAVE OUTER DIAMETERS GREATER THAN THAT OF THE CIRCLE OF CONTACT. THE STACK OF SHEETS, IS PRE-HEATED AND THEN PLACED IN THE PRESS. THE PRESS IS HEATED, CLOSED TO IMPRESS THE SOUND GROOVES IN THE SURFACE SHEETS AND TO ACHIEVE LAMINATION, AND THEN COOLED AND OPENED. THERE IS A CRITICAL RELATIONSHIP BETWEEN SHEET THICKNESS AND THE DEPTH OF THE MOLD CAVITY IN THE RECORD PRESS.

Inventors

• 👤 Harold F Dague

Bibliographic Details