Method for extruding plastic with accent color pattern

Details Method for extruding plastic with accent color pattern Method for extruding plastic with accent color pattern

1991-05-01

1995-02-07

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Random variegated coloring during molding

By extrusion

264171, 2642101, 264245, 425132, 4251335, B29C 4706

Patent

active

053873815

ABSTRACT:
A new and useful process for producing a plastic article (e.g., vinyl siding) with an accent color pattern incorporated therein, and a specially formed accent color pellet which is useful in such a process. The process contemplates extruding a plastic product from a base compound formed of powder sized particles and specially formed accent color pellets. The accent color pellets are alloyed masses of resins and pigment which are larger than the powder particles of the base compound, and have a higher deflection temperature than the base compound. The alloyed pellets are designed with controlled heat deflection characteristics. During the extrusion process, the accent color pellets begin to soften and disperse later than the base compound, and cause restricted dispersion of the accent color into the base compound, thereby producing accent color streaks in the resulting extrudate. The process is particularly suited for producing a simulated woodgrain or streaking effect in plastic. (e.g., vinyl) siding.

REFERENCES:
patent: 3488246 (1970-01-01), Duggins
patent: 3769380 (1973-10-01), Wiley
patent: 3871629 (1975-03-01), Hishida
patent: 3906065 (1975-09-01), Schneider et al.
patent: 4048101 (1977-09-01), Nakamachi
patent: 4128689 (1978-12-01), Heaps et al.
patent: 4302410 (1981-11-01), Beech
patent: 4505869 (1985-03-01), Nishibori
patent: 4528155 (1985-07-01), Elder
patent: 4649008 (1987-03-01), Johnstone
patent: 5053176 (1991-10-01), Cameron et al.

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