Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1998-06-12
2000-07-04
Krynski, William
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264310, 428407, B29C 3106, B28B 102, B32B 2704
Patent
active
060834463
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for producing a multicolored thermoplastic film according to the definition of the species of claim 1 and a multi-colored thermoplastic film according to the definition of the species of claim 10.
German Patent No. 3,637,524 C2 describes a multi-colored thermoplastic film consisting of a monochromatic base material and a differently colored admixture. The differently colored admixture consists of particles which are considerably larger than pigments and have an approximately spherical shape. At the softening point of the base material, the differently colored admixtures are solid or at least considerably more viscous than the base material. In addition, the differently colored admixture is also smaller than the film wall thickness, so that the geometric shape of these particles remains essentially unchanged. This yields a mottled color effect in such films.
It is known from the publication Kunststoffberater [Plastics Adviser], Jul. 8, 1968, "Manufacturing Dashboards by the PVC Powder Slush Technology," Dr. R. Saffert, pages 51 to 53, which is the generic prior art, that slush membranes can be colored with pigments. It is also mentioned there that the pigments are not broken up quite as well by the sintering process as by calendering.
European Patent No 176,274 A2 discloses a three-dimensional multi-colored plastic body and a method of producing same by powder slush technology. The base material used consists of particles with a transparent core of plastic and an outer shell comprising colored pigments.
U.S. Pat. No. 3,253,068 A discloses a method and a device for producing decorative hollow balls. Colored chips in the manner of a mosaic are bonded using plastic as the binder to form the shell of the ball.
British Patent No. 2,082,108 A likewise relates to a method of producing balls and the product produced by that method. Balls and powder are placed in a slush mold here and gelled. Metal strips may also be added to achieve decorative effects.
It is also known that a monochromatic film can be printed in color. However, this yields a repeat in the pattern because of the finite extent of the printing roll. Since the color is applied only to the surface, this film is also sensitive to abrasion.
The abrasion sensitivity is also a problem with slush membranes with colored admixtures. The slush process does not prevent concentrations of color from also developing at the surface. Then they are not protected from abrasion.
The object of the present invention is to improve on a method of producing multi-colored plastic films by the slush method and the multi-colored plastic films produced by the slush method to the extent that the plastic films are reliably protected from abrasion of colored components.
With a method according to the definition of the species of claim 1 and with a plastic film according to the definition of the species of claim 10, this object is achieved by the features given in the characterizing part of the respective claim.
When the colorant material and the colorless or uniformly monochromatic plastic base material forming the slush material are hot-sintered after mixing incompletely, rotating the mold for the purpose of uniformly distributing the slush material on the surface of the mold and thus achieving a constant film thickness causes only a slight further mixing of the plastic base material and the colorant material, because the mixing cycle is ended very early due to the gelation which occurs on heating. The random local concentration distribution always leads to films with different colored designs, i.e., so-called originals.
To prevent abrasion of color when the color concentrations are on or near the surface of the film, the colorant is not introduced in pure form, but instead as a plurality of coloring elements consisting of a colorant content and a transparent plastic shell around the colorant. The colorant content is thus encapsulated by the plastic shell and is thus protected. During sintering and gelling, the colorant content is left in the pla
REFERENCES:
patent: 3079644 (1963-03-01), Molitor et al.
patent: 3253068 (1966-05-01), Whittington
patent: 3773535 (1973-11-01), Burgyan et al.
patent: 4740337 (1988-04-01), Gale et al.
Saffert, Reinhard, "Armaturenbrett-Fertigung nach der PVC-Powder-Slush-Technologie", FACHBETTRAG, 279 Kunststoffberater 31 (1986) Jul./Aug., Nos. 7-89, Isenhagen (Hannover), W. Germany.
Bargiel Lothar
Eysel Konrad
Propper Johannes
Reichert Dieter
Banecke-Kaliko AG
Garrett Dawn L.
Krynski William
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