Apparatus for producing rubber strip

• US 20060057243A1
• Filed: 08/19/2005
• Published: 03/16/2006
• Est. Priority Date: 09/14/2004
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Hayashi, Norio, Onimatsu, Hiroyuki
• Granted Patent: US 7,494,335 B2
• Time in Patent Office: Days
• US Class Current: 425/363
• CPC Class Codes: B29C 48/07 Flat, e.g. panels
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/12 Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
• CPC Class Codes: B29C 48/345 Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
• CPC Class Codes: B29C 48/35 with rollers
• CPC Class Codes: B29C 48/695 Flow dividers, e.g. breaker plates
• CPC Class Codes: B29L 2030/002 Treads

Abstract

The present invention relates to an apparatus for producing at least two rubber strips comprising an extruder for extruding compounded rubber into at least two preliminary rubber strips each having a preliminary cross sectional shape, and a pair of calendar rollers for simultaneously forming the preliminary rubber strips into at least two rubber strips each having a finished cross sectional shape.

Claims

1. An apparatus for producing at least two rubber strips comprising:

an extruder for extruding compounded rubber,

said extruder comprising

a main body having an extrusion opening, and

a die attached to the main body,

said die comprising

an inlet port in communication with the extrusion opening of the main body,

at least two outlet ports from which the compounded rubber is extruded into at least two preliminary rubber strips each having a preliminary cross sectional shape, and

a rubber passage extending between the inlet port and the outlet ports so as to distribute the compounded rubber supplied from the inlet port to each outlet port; and

a pair of calendar rollers for simultaneously forming said at least two preliminary rubber strips into at least two rubber strips each having a finished cross sectional shape.

2. The apparatus according to claim 1, wherein

said die comprises a die head provided with the inlet port, and

a mouthpiece mounted on the die head and provided with the outlet ports.

3. The apparatus according to claim 2, wherein

said rubber passage has a first passage part extending in the die body and a second passage part connected to the first passage part and extending in the mouthpiece, and

the second passage part having at least two branch passages.

4. The apparatus according to claim 2, wherein

said rubber passage has a first passage part extending in the die body and a second passage part connected to the first passage part and extending in the mouthpiece,

the second passage part having at least two branch passages, and

each said branch passage is tapered such that a height and a width of sectional shape thereof are reduced toward the outlet port.

5. The apparatus according to claim 1, wherein

said outlet ports have substantially the same cross sectional shapes.

6. The apparatus according to claim 1, wherein

said outlet ports are separated from each other by a distance of from 2 mm to 100 mm in a widthwise direction of the rubber strip.

7. The apparatus according to claim 2, wherein

said mouthpiece is mounted on the die head such that the mouthpiece can be exchanged.

8. The apparatus according to claim 1, wherein

at least one said calendar roller is provided with at least two parallel grooves extending circumferential direction of the roller for forming at least two rubber strips.

9. The apparatus according to claim 8, wherein

said grooves have substantially the same cross sectional shapes.

10. The apparatus according to claim 8, wherein

said grooves each have a flat bottom, and a pair of side walls each extending from ends of the bottom in a direction increasing a groove width.