Methods for gravimetrically metering liquid color

• US 8,757,217 B2
• Filed: 05/18/2011
• Issued: 06/24/2014
• Est. Priority Date: 06/16/2006
• Status: Active Grant

• Current Assignee: Stephen B. Maguire
• Original Assignee: Stephen B. Maguire
• Inventors: Maguire, Stephen B.
• Primary Examiner(s): MAUST, TIMOTHY LEWIS
• Application Number:
  US13/110,391
• Publication Number:
  US 20120260992A1
• Time in Patent Office: 1,133 Days
• Field of Search: 141/2, 141/83, 141/94, 141100-105, 366/141, 177/64, 177/66, 177/73, 177/81
• US Class Current: 141/2
• CPC Class Codes: B29B 7/88 Adding charges , i.e. additives
• CPC Class Codes: B29C 2948/9218 Weight
• CPC Class Codes: B29C 2948/926 Flow or feed rate
• CPC Class Codes: B29C 48/29 in liquid form
• CPC Class Codes: F04B 43/082 the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism
• CPC Class Codes: G01G 11/08 having means for controlling the rate of feed or discharge regulation of flow of fluent material G05D
• CPC Class Codes: G01G 13/00 Weighing apparatus with automatic feed or discharge for weighing-out batches of material for weighing a continuous stream G01G11/00; check-weighing G01G15/00; for fluids G01G17/04; apportioning by weight materials to be mixed G01G19/22; combinatorial weighing G01G19/387
• CPC Class Codes: G01G 13/247 Checking quantity of material in the feeding arrangement, e.g. discharge material only if a predetermined quantity is present
• CPC Class Codes: G01G 13/248 Continuous control of flow of material control of flow G05D7/00
• CPC Class Codes: Y10T 137/0318 Processes
• CPC Class Codes: Y10T 137/85978 With pump

Abstract

A method for delivering liquid color directly into the screw barrel of a plastic resin process machine including weighing a container of liquid color; pumping liquid color from the container into the plastic resin process machine screw barrel; and continuously comparing actual readings from the scale to expected readings based on a desired predetermined liquid color usage rate and continuously regulating speed of pumping in response to such comparison to supply liquid color directly into the to the plastic resin process machine screw barrel according to a selected recipe of resin material to produce plastic parts having desired color characteristics.

Claims

1. A method for delivering liquid color directly into the screw barrel of a plastic resin process machine, comprising:

a) weighing a container of liquid color;

b) pumping liquid color from the container into the plastic resin process machine screw barrel; and

c) continuously comparing actual readings from the scale to expected readings based on a desired predetermined liquid color usage rate and continuously regulating speed of pumping in response to such comparison to supply liquid color directly into the plastic resin process machine screw barrel according to a selected recipe of resin material to produce plastic parts having desired color characteristics.

2. The method of claim 1 further comprising continuously weighing the container.

3. The method of claim 1 further comprising supporting the container during weighing.

4. The method of claim 2 further comprising supporting the container during weighing.