US 12,350,867 B2
Method for producing gramophone records by injection moulding
Adrianus Martinus Gerardus Theunisse, Berghem (NL); and Petrus Johannes Frederik Joseph Van Hout, Helmond (NL)
Appl. No. 17/757,078
Filed by Adrianus Martinus Gerardus Theunisse, Berghem (NL)
PCT Filed Dec. 7, 2020, PCT No. PCT/NL2020/050762
§ 371(c)(1), (2) Date Jun. 9, 2022,
PCT Pub. No. WO2021/118344, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2024410 (NL), filed on Dec. 9, 2019.
Prior Publication US 2023/0011470 A1, Jan. 12, 2023
Int. Cl. B29C 45/00 (2006.01); B29C 45/56 (2006.01); B29K 67/00 (2006.01); B29K 105/00 (2006.01); B29L 17/00 (2006.01)
CPC B29C 45/0001 (2013.01) [B29C 45/0053 (2013.01); B29C 45/561 (2013.01); B29C 2795/007 (2013.01); B29K 2067/003 (2013.01); B29K 2105/0085 (2013.01); B29L 2017/003 (2013.01)] 7 Claims
OG exemplary drawing
 
1. Method for producing gramophone records by injection moulding, comprising:
heating polymeric material to liquefy said material, said polymeric material is polyethylene terephthalate isophthalic acid modified copolymer;
supplying liquid polymeric material (2) under pressure by one single injection nozzle (11), into a space (7) between two moulding mould parts (3, 5) through a single passage (12) located in one of the mould parts (5) wherein said two moulding mould parts (3, 5) are disposed at a distance between 1 and 5 mm from each other;
immediately after injection of the liquid polymeric material the mould parts are moved against each other creating a mould cavity having a shape of a gramophone record;
wherein said injection nozzle (11) is provided with a nozzle piece (31) and an inlet opening (33) and a pouring channel (35) extending between said inlet opening (33) and said nozzle piece (31) such that the liquid polymeric material is provided with a single stream from the inlet opening (33) into the space (7) and does not split into sub-streams, and wherein said liquid polymeric material is supplied in a direction perpendicular to the moulding surfaces of the mould parts.