Method for processing thermoplastics or thermosetting plastics

• US 4,334,784 A
• Filed: 08/03/1979
• Issued: 06/15/1982
• Est. Priority Date: 05/11/1977
• Status: Expired due to Term

• Current Assignee: Draiswerke GmbH
• Original Assignee: Draiswerke GmbH
• Inventors: Engels, Kaspar
• Primary Examiner(s): Coe, Philip R.
• Assistant Examiner(s): Simone, Timothy F.
• Application Number:
  US06/063,401
• Time in Patent Office: 1,047 Days
• Field of Search: 366/76, 366/99, 366/102, 366/156, 366/158, 366/167, 366/160-162, 366/168, 366/172, 366/173, 366/177, 366/179, 366/279, 366/181-183, 366/189, 366/192, 366/193 , 366/79-83, 366/18, 222/55, 222/135, 198/505
• US Class Current: 366/76.3
• CPC Class Codes: B01F 35/833 Flow control by valves, e.g. opening intermittently
• CPC Class Codes: B28C 7/0459 the ingredients being first supplied into measuring chambers, e.g. containers or skips
• CPC Class Codes: B29B 7/16 with paddles or arms
• CPC Class Codes: B29B 7/244 of several materials
• CPC Class Codes: B29B 7/283 measuring data of the driving system, e.g. torque, speed, power
• CPC Class Codes: B29B 7/72 Measuring, controlling or regulating
• CPC Class Codes: B29B 7/748 Plants B29B7/7433, B29B7/7485, B29B7/7495 take precedence
• CPC Class Codes: B29B 7/94 Liquid charges
• CPC Class Codes: B29B 9/06 in the form of filamentary material, e.g. combined with extrusion

Abstract

A method of processing plastic material uses a device which operates in a batchwise fashion. The device includes a cylindrical container having a shaft disposed coaxially therein. The shaft is provided with mixing tools and can be driven at high speed. Material to be processed, and liquid if desired, is supplied to the container in pre-metered amounts, gelled by resultant frictional heat and granulated, if necessary, then expelled from the container. The material is supplied in a continuous, metered constant quantity stored temporarily and then fed into the container cyclically at predetermined intervals. The apparatus for carrying out the method includes at least one metering device which feeds an intermediate container and instrumentalities for cyclically emptying the intermediate container into the cylindrical container.

Claims

1. In a method of processing plastics comprising supplying a batch comprising a predetermined quantity of material to be processed to a container having mixing members therein, causing the batch of material to be gelled by heat produced by friction as the mixing members are moved through the batch of material, expelling the entire batch of processed material from the container, and, only after said expelling step, repeating the supplying, causing and expelling steps with another batch of material, the improvement by which a batch of material may be continuously formed while another batch is being processed, comprising the steps of:

continuously providing material to be processed in a continuous, constant, gravimetrically-determined quantity stream, whereby a constant weight of material is provided per unit of time, wherein the rate of material being provided is sufficient to provide said predetermined quantity batch of material in approximately the time necessary to complete said supplying, causing and expelling steps;

temporarily storing the material being continuously provided in said providing step until a batch of approximately said predetermined quantity has been accumulated; and

feeding the entire amount of temporarily stored material to the container at predetermined cyclic time intervals corresponding to the accumulation of a batch of approximately said predetermined quantity during said temporarily storing step, whereby said time intervals will also necessarily approximate the time necessary to complete said supplying, causing and expelling steps, and wherein said feeding step constitutes said supplying step.

2. A method according to claim 1, further including the step of continuously providing liquid in a continuous volume to a temporary storage container, temporarily storing the liquid, and dispensing all of the liquid temporarily stored in the temporary storage container into the container at predetermined cyclic time intervals, the length of said time intervals approximating the time necessary to complete said supplying, causing and expelling steps.

3. A method according to claim 1, including moving the mixing members continuously.

4. A method according to claim 1, wherein the amount of time necessary to complete said feeding step is shorter than the period of time within which the material is temporarily stored prior to said feeding step.

5. A method according to claim 1, wherein the material is subjected to an approximately constant force during processing.

6. A method according to claim 1, including supplying liquid to the container.

7. A method according to claim 1, including granulating the material in the container.