# US 2014/0197566 A1 · Twin screw extruder

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- Number: US 2014/0197566 A1
- Document ID: US20140197566A1
- Status: Published application
- Kind: A1
- Application number: 14/211,674
- Filed: 2014-03-14
- Published: 2014-07-17
- Earliest claimed: 2012-03-16
- Assignees: King Abdulaziz City for Science and Technology
- Applicants: King Abdulaziz City for Science and Technology
- Inventors: Fares D. ALSEWAILEM
- Web page: https://patentgrep.com/patent/US20140197566A1

## CPC

- B29C 48/405: Intermeshing co-rotating screws
- B01F 27/922: with two or more helices, e.g. with intermeshing helices
- B29B 7/482: {provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs}
- B29B 7/484: {with two shafts provided with screws, e.g. one screw being shorter than the other (B29B7/482 takes precedence)}
- B29B 7/488: {Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices (discharging B29B7/582; feeding B29B7/60)}
- B29C 48/385: using two or more serially arranged screws in separate barrels
- B29C 48/402: {the screws having intermeshing parts}
- B29C 48/41: Intermeshing counter-rotating screws
- B29C 48/42: Non-identical or non-mirrored screws
- B29C 48/57: provided with kneading disc-like elements, e.g. with oval-shaped elements
- B29C 48/625: characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
- B29C 48/767: {through a degassing opening of a barrel}
- B29C 48/802: {Heating}
- B29C 48/82: Cooling (B29C48/84 takes precedence)
- B29C 48/92: Measuring, controlling or regulating
- B29B 7/847: {Removing of gaseous components before or after mixing}
- B29C 48/022: {characterised by the choice of material}
- B29C 48/832: {Heating}
- B29C 2948/92704: Temperature
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

## Abstract

An extruder is disclosed, and more particularly, a twin screw extruder for mixing, compounding, kneading and/or extruding of materials. The twin screw extruder includes a barrel assembly having a housing. The twin screw extruder further includes a first screw provided within the housing and comprising threads. The twin screw extruder further includes a second screw provided within the housing and comprising a threaded portion and a shaft portion devoid of threads. A drive system which drives the first screw and the second screw.

## Claims

### Claim 1

A method of mixing material, comprising:
placing material within a hopper assembly for feeding into a first compartment;
transporting the material from the first compartment to a second compartment using a single threaded screw configuration;
kneading the material in the second compartment with a twin screw configuration; and
metering the material to a die with a single threaded screw configuration, different than the single threaded screw configuration used for transporting.

### Claim 2 (depends on 1)

The method of claim 1, wherein the metering the material to the die further comprises transporting the material through a third compartment with the single threaded screw configuration.

### Claim 3 (depends on 2)

The method of claim 2, further comprising venting gas using a vacuum port in the third compartment.

### Claim 4 (depends on 1)

The method of claim 1, further comprising heating or cooling the material in the first compartment.

### Claim 5 (depends on 1)

The method of claim 1, further comprising heating or cooling the material in the second compartment.

### Claim 6 (depends on 1)

The method of claim 1, further comprising placing at least one of polymeric material, raw materials, plastic materials, and food within the hopper assembly for the feeding into the first component.

### Claim 7 (depends on 1)

The method of claim 1, further comprising placing at least one of pellets and powders within the hopper assembly for the feeding into the first component.

### Claim 8 (depends on 1)

The method of claim 1, further comprising at least one of mixing, compounding, reacting, and extruding the material in the second compartment with the twin screw configuration.