Claims
- 1. The method of marbleizing the melt of a screw injection machine, which comprises the steps of:
- (a) preparing a liquid colorant of at least sixty percent higher viscosity than the melt; and
- (b) injecting the liquid colorant into a melt which is at least fifty percent molten at a pressure at least about three tims as great as the pressure of the melt at the point of injection; thereby to create a band of colorant within the melt at an intermediate level thereof.
- 2. The method of claim 1 wherein the injection pressure is above about 3,000 pounds per square inch.
- 3. The method of claim 2 wherein the injection pressure is about 3,600 pounds per square inch.
- 4. The method of claim 1 wherein said liquid coloring is injected through a fitting having an outlet orifice with a diameter in the range from about 0.018 inch to about 0.025 inch.
- 5. The method of claim 1 wherein said liquid colorang injected through a fitting having an injection capacity in the range from about 0.001 cubic inch to about 0.008 cubic inch per injection stroke.
- 6. The method of claim 1 wherein said relative viscosity of said colorant is in the range from about 60 percent to about 80 percent greater than that of said melt.
- 7. The method of claim 1 wherein the screw reciprocates and the colorant is injected while said screw is in at least one of the following positions:
- a. The reciprocating screw is in its most forward position.
- b. The reciprocating screw is injecting;
- c. The reciprocating screw is in its most rearward position; and
- d. The reciprocating screw is reciprocating.
BACKGROUND
This is a divisional of Ser. No. 660,006 filed Feb. 23, 1976, now abandoned relating to the marbleization of materials and more particularly, to the marbleization of materials extruded from injection machines of the screw type.
US Referenced Citations (6)
Divisions (1)
|
Number |
Date |
Country |
Parent |
660006 |
Feb 1976 |
|