Extruder, masterbatch manufacturing method, and tire manufacturing method

Patent metadata

Field	Value
Publication number	US-11230046-B2
Application number	US-201716346241-A
Country	US
Kind code	B2
Filing date	Jul 18, 2017
Priority date	Jan 10, 2017
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

An extruder is disclosed including: a barrel; and a screw provided with a helical groove; wherein the screw comprises a dewatering portion comprising a first portion, and a second portion at a location downstream from the first portion; wherein, at the dewatering portion, clearance between the groove and the barrel decreases as one proceeds downstream; and wherein clearance reduction ratio at the first portion is greater than clearance reduction ratio at the second portion.

First claim

The invention claimed is:

1. An extruder for manufacturing masterbatch comprising:
a barrel; and
a screw provided with a helical groove;
wherein the screw comprises a dewatering portion comprising a first portion, and a second portion at a location downstream from the first portion;
wherein, at the dewatering portion, clearance between the groove and the barrel decreases as one proceeds downstream;
wherein a reduction ratio R of the clearance at the first portion is greater than a reduction ratio r of the clearance at the second portion;
wherein R is given by Formula I;
wherein the Formula I is
R=H N /H N+1 ;

H N indicates the clearance between the groove and the barrel at an arbitrary Nth turn of the groove in the first portion;
H N+1 indicates the clearance between the groove and the barrel at an N+1st turn of the groove in the first portion;
wherein r is given by Formula II;
wherein the Formula II is
r=h n /h n+1 ;

wherein h n indicates the clearance between the groove and the barrel at an arbitrary nth turn of the groove in the second portion; and
wherein h n+1 indicates the clearance between the groove and the barrel at an n+1st turn of the groove.

2. A masterbatch manufacturing method comprising:
an operation in which pre-coagulation rubber latex comprising filler is coagulated to obtain a coagulum; and
an operation in which the extruder according to claim 1 is used to dewater the coagulum.

3. A tire manufacturing method comprising: an operation in which the masterbatch manufacturing method according to claim 2 is used to prepare a masterbatch;
an operation in which at least the masterbatch and compounding ingredients are dry-mixed to obtain a mixture;
an operation in which at least a vulcanizing compounding ingredient is kneaded into the mixture to obtain a rubber composition; and
an operation in which a green tire equipped with a tire member made up of the rubber composition is made.

4. The tire manufacturing method according to claim 3 wherein the vulcanizing compounding ingredient comprises sulfur.

5. The masterbatch manufacturing method according to claim 2 wherein the operation in which the extruder is used to dewater the coagulum comprises increasing temperature of the coagulum to 110° C. to 160° C. at the first portion.

6. The masterbatch manufacturing method according to claim 2 wherein, during the operation in which the extruder is used to dewater the coagulum, temperature of the coagulum when in a space between the barrel and the second portion of the screw is not greater than 160° C.

7. The masterbatch manufacturing method according to claim 2 further comprising an operation in which a carbon black slurry and rubber latex are mixed to obtain the pre-coagulation rubber latex.

8. The masterbatch manufacturing method according to claim 7 wherein the rubber latex is natural rubber latex.

9. The masterbatch manufacturing method according to claim 2
wherein the operation in which the extruder is used to dewater the coagulum comprises increasing temperature of the coagulum to 110° C. to 160° C. at the first portion; and
wherein, during the operation in which the extruder is used to dewater the coagulum, temperature of the coagulum when in a space between the barrel and the second portion of the screw is not greater than 160° C.

10. The masterbatch manufacturing method according to claim 3 , wherein the vulcanizing compounding ingredient is a vulcanizing accelerator selected from the group consisting of a sulfenamide vulcanization accelerator, a thiuram vulcanization accelerator, a thiazole vulcanization accelerator, a thiourea vulcanization accelerator, a guanidine vulcanization accelerator and a dithiocarbamate vulcanization accelerator.

11. The masterbatch manufacturing method according to claim 3 , wherein the vulcanizing compounding ingredient is an organic peroxide.

Assignees

• Toyo Tire Corp

Inventors

• Tanaka Makoto

Classifications

• C08C1/14

  Coagulation · CPC title

• B29C48/766

  in screw extruders · CPC title

• C08J3/22

  using masterbatch techniques · CPC title

• C08J3/212

  and solid additives · CPC title

• B29B7/90

  Fillers or reinforcements {, e.g. fibres} · CPC title