US3979107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for the admixing of a pigment color in a dosaged manner into a plastics material granulate
Assignee: Azo Maschinenfabrik Adolf Zimmermann GmbH
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Filing: 1973-10-10
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Granted: 1976-09-07
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Expires: 1993-10-10
Abstract
Abstract A coarse-particle plastics granulate is colored by being dosed and mixed with a fine-powder pigment by means of a dosaging screw and, if necessary, an after-mixer at the discharge end of said screw. A coarse-particle "cleaning material" is supplied to the dosaging screw upstream of the pigment to prevent sticking and caking of the fine powder and to achieve uniform distribution of the color in the granulate. A proportion of the granulate itself may be introduced as the cleaning material. The dosaging screw is mounted so as to be readily replaceable by a clean one. It may be formed with two sections of different diameter so that the entry volume at the cleaning material inlet is smaller than at the pigment inlet. The dosaging screw is normally driven in time with a plastics processing machine using the colored granulate, but may be adapted to operate discontinuously when only a small amount of color is required or when the machine output is small.
Inventors
- 👤 Adolf Lesk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:43
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/60; B29B7/80; B29B7/802; B29B9/00; B29B9/16; B29C; B29C45/00; B29C45/17; B29C45/18; B29C45/1816; B29C48/00; B29C48/25; B29C48/27; B29C48/2715; B29C48/285; B29C48/29; B29C48/03; B29C48/288; B29C48/297; B29K; B29K2105/00; B29K2105/0005
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
136 words
A process for admixing a controlled amount of a colorant in the form of a fine powder with a granulated plastic material being fed via a hopper to a plastics material processing machine, said process comprising feeding a quantity of a cleaning material comprising a coarse-particle plastic material to said hopper by means of a dosaging screw connected to said hopper, feeding to said dosaging screw said colorant so that said colorant and said cleaning material are fed together to said hopper, said colorant being fed to said dosaging screw downstream of the location at which said cleaning material is fed to said dosaging screw, and mixing said colorant and said cleaning material with said granulated plastic material prior to entry of said colorant, said cleaning material and said granulated plastic material into said processing machine.
Claim 2
Dependent Claim
136 words
A process for admixing a controlled amount of a colorant in the form of a fine powder with a granulated plastic material being fed via a hopper to a plastics material processing machine, said process comprising feeding a quantity of a cleaning material comprising a coarse-particle plastic material to said hopper by means of a dosaging screw connected to said hopper, feeding to said dosaging screw said colorant so that said colorant and said cleaning material are fed together to said hopper, said colorant being fed to said dosaging screw downstream of the location at which said cleaning material is fed to said dosaging screw, and mixing said colorant and said cleaning material with said granulated plastic material prior to entry of said colorant, said cleaning material and said granulated plastic material into said processing machine.
Claim 3
Dependent Claim
17 words
The process according to claim 1 wherein said cleaning material is composed of said granulated plastics material.
Claim 4
Dependent Claim
34 words
The process according to claim 2, wherein said granulated plastics material is fed to said hopper, and thereafter a portion of the granulated plastics material in said hopper is fed to said dosaging screw.
Claim 5
Dependent Claim
34 words
The process according to claim 1, wherein said cleaning material is regenerated plastics material which has already been processed by said plastics material processing machine and which has been comminuted to obtain a granulate.
Claim 6
Dependent Claim
31 words
The process according to claim 1, wherein all of said cleaning material is fed to said dosaging screw upstream of the location where said colorant is fed to said dosaging screw.
Claim 7
Dependent Claim
12 words
The process according to claim 1, wherein said dosaging screw is horizontal.
Claim 8
Dependent Claim
39 words
The process according to claim 1, wherein the chamber in which said colorant, said cleaning material and said granulated plastics material are mixed has a volume several times the volume of the outlet volume of the plastics processing machine.
Claim 9
Dependent Claim
40 words
The process according to claim 3, wherein said cleaning material is fed to said dosaging screw through a first inlet and further wherein said colorant is fed to said dosaging screw through a second inlet downstream of said first inlet.
Claim 10
Dependent Claim
32 words
The process according to claim 8, wherein the entry volume of the dosaging screw at said first inlet is smaller than the entry volume of said dosaging screw at said second inlet.
Claim 11
Dependent Claim
20 words
The process according to claim 8, further comprising preventing said cleaning material from being pressed back into said second inlet.
Claim 12
Dependent Claim
34 words
The process according to claim 10, wherein cleaning material is prevented from entering said second inlet by arranging a baffle plate partly closing the annular gap between said first inlet and said second inlet.
Claim 13
Dependent Claim
40 words
The process according to claim 1, wherein said cleaning material is fed to said dosaging screw through a first inlet and further wherein said colorant is fed to said dosaging screw through a second inlet downstream of said first inlet.
Claim 14
Dependent Claim
32 words
The process according to claim 12, wherein the entry volume of the dosaging screw at said first inlet is smaller than the entry volume of said dosaging screw at said second inlet.
Claim 15
Dependent Claim
19 words
The process of claim 12, further comprising preventing said cleaning material from being pressed back into said second inlet.
Claim 16
Dependent Claim
34 words
The process according to claim 14, wherein cleaning material is prevented from entering said second inlet by arranging a baffle plate partly closing the annular gap between said first inlet and said second inlet.
Claim 17
Dependent Claim
33 words
The process according to claim 12, wherein the particle size of said granulated plastics material and the particle size of said cleaning material are substantially coarser than the particle size of said colorant.
Claim 18
Dependent Claim
33 words
The process according to claim 8, wherein the particle size of said granulated plastics material and the particle size of said cleaning material are substantially coarser than the particle size of said colorant.
Claim 19
Dependent Claim
33 words
The process according to claim 1, wherein the particle size of said granulated plastics material and the particle size of said cleaning material are substantially coarser than the particle size of said colorant.
Claim 20
Dependent Claim
164 words
A process for admixing a controlled quantity of a powdered colorant with a plastic material granulate to be processed by a plastics material processing machine in such a way that said colorant is distributed uniformly in said plastic material granulate before said granulate is introduced into said processing machine, said process comprising feeding a cleaning material composed of plastic particles having a substantially coarser particle size than said colorant to a chamber for mixing with said plastic material granulate, said cleaning material being fed to said chamber by means of a dosaging screw, feeding said colorant to said dosaging screw downstream of the inlet in said dosaging screw for said cleaning material so that said colorant is fed to said chamber along with said cleaning material, feeding said plastic material granulate to said chamber and mixing the colorant, cleaning material and plastics material granulate fed to said chamber prior to entry of said colorant, cleaning material and plastic material granulate into said processing machine.
Claim 21
Dependent Claim
164 words
A process for admixing a controlled quantity of a powdered colorant with a plastic material granulate to be processed by a plastics material processing machine in such a way that said colorant is distributed uniformly in said plastic material granulate before said granulate is introduced into said processing machine, said process comprising feeding a cleaning material composed of plastic particles having a substantially coarser particle size than said colorant to a chamber for mixing with said plastic material granulate, said cleaning material being fed to said chamber by means of a dosaging screw, feeding said colorant to said dosaging screw downstream of the inlet in said dosaging screw for said cleaning material so that said colorant is fed to said chamber along with said cleaning material, feeding said plastic material granulate to said chamber and mixing the colorant, cleaning material and plastics material granulate fed to said chamber prior to entry of said colorant, cleaning material and plastic material granulate into said processing machine.
Claim 22
Dependent Claim
20 words
The process according to claim 19, wherein said cleaning material is composed of a portion of said plastics material granulate.
Claim 23
Dependent Claim
15 words
The process according to claim 19, wherein said cleaning material is a regenerated plastic material.
Claim 24
Dependent Claim
33 words
The process according to claim 19, in which said colorant is an agglomerated product of satisfactory flowing properties, said agglomerated product being milled in the dosaging screw by means of the cleaning material.
Claim 25
Dependent Claim
33 words
The process according to claim 19, wherein the particle size of said granulated plastics material and the particle size of said cleaning material are substantially coarser than the particle size of said colorant.
Claim 26
Dependent Claim
22 words
The process according to claim 23, wherein the volume of said chamber is several times the outlet volume of said processing machine.
References Cited (Backward Citations)
US3148412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |