Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1996-10-15
1999-04-27
Ortiz, Angela
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
2643288, 264510, 264537, 264DIG57, B29C 4516
Patent
active
058978224
ABSTRACT:
A method and apparatus for manufacturing hollow plastic articles having a wall which at least partly consists of at least one core layer and two outer layers covering the core layer on both sides, in particular suitable for manufacturing preforms for bottles, wherein use is made of an injection-molding machine with a mold comprising at least one mold cavity, and an injection nozzle which, via an injection channel in the mold, connects to the mold cavity and has a central material feed channel, a needle of a controllable needle valve, which needle is active in the central material feed channel and can close or release the part of the central material feed channel located adjacent the injection channel, and at least one further material feed channel, opening into the central material feed channel, wherein first a plastic material of a first type for forming the outer layers is fed to the mold cavity and then at least one plastic material of a second type for forming at least one core layer. After the feed of the material of a second type and after the freezing of the material in the injection channel, material of the first type is fed to the central channel in at least the space before the free end of the needle, and then, the needle is moved to the injection channel for mechanically compressing, in the sprue of the plastic article located in the injection channel, the material located before the needle.
REFERENCES:
patent: 4143733 (1979-03-01), Von Buren et al.
patent: 4459257 (1984-07-01), Baciu
patent: 4701292 (1987-10-01), Valyi
patent: 4710118 (1987-12-01), Krishnakumar
patent: 4923723 (1990-05-01), Collette et al.
patent: 4950143 (1990-08-01), Krishnakumar
patent: 4990301 (1991-02-01), Krishnakumar
patent: 5032341 (1991-07-01), Krishnakumar
patent: 5049345 (1991-09-01), Collette et al.
patent: 5098274 (1992-03-01), Krishnakumar
patent: 5141695 (1992-08-01), Nakamura
patent: 5200207 (1993-04-01), Akselrud et al.
patent: 5645786 (1997-07-01), Okada et al.
Patent Abstracts of Japan, vol. 14, No. 247, May 25, 1990 & JP-A 2-067117 (Toyo Seikan Kaisha Ltd), Mar. 7, 1990.
Albers Hendrikus Johana Theodorus
van Manen Dirk
Inter Tooling Services B.V.
Ortiz Angela
LandOfFree
Method of manufacturing hollow plastic articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of manufacturing hollow plastic articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing hollow plastic articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-684412