Rubber tube, and method of producing the same

Patent metadata

Field	Value
Publication number	US-2017261134-A1
Application number	US-201715437902-A
Country	US
Kind code	A1
Filing date	Feb 21, 2017
Priority date	Mar 14, 2016
Publication date	Sep 14, 2017
Grant date	—

Abstract

A rubber tube has an inner surface at least partly roughed so that the ratio (Rz/D) of the maximum height Rz of the inner surface to the inner diameter D of the tube is not less than 0.038. The ratio (Rp/D) of the maximum peak height Rp of the inner surface to the inner diameter D of the tube may be not less than 0.019. The ratio (Rv/D) of the maximum valley depth Rv of the inner surface to the inner diameter D of the tube may be not less than 0.019. The ratio (Ra/D) of the arithmetic average roughness Ra of the inner surface to the inner diameter D of the tube may be not less than 0.0036. The ratio (Rq/D) of the root mean square height Rq of the inner surface to the inner diameter D of the tube maybe not less than 0.0046. Thus, the rubber tube has a reduced adhesiveness.

First claim

What is claimed is:

1 . A rubber tube having an inner surface roughened so that a ratio (R/D) of an inner surface roughness R of the tube to an inner diameter D of the tube is not less than a predetermined level.

2 . The rubber tube according to claim 1 , wherein the roughened inner surface includes an inner surface portion of a collapsible part of the tube.

3 . The rubber tube according to claim 1 , wherein the inner surface roughness R is a maximum height Rz, and a ratio Rz/D is not less than 0.038.

4 . The rubber tube according to claim 1 , wherein the inner surface roughness R is a maximum peak height Rp, and a ratio Rp/D is not less than 0.019.

5 . The rubber tube according to claim 1 , wherein the inner surface roughness R is a maximum valley depth Rv, and a ratio Rv/D is not less than 0.019

6 . The rubber tube according to claim 1 , wherein the inner surface roughness R is an arithmetic average roughness Ra, and a ratio Ra/D is not less than 0.0036.

7 . The rubber tube according to claim 1 , wherein the inner surface roughness R is a root mean square height Rq, and a ratio Rq/D is not less than 0.0046.

8 . The rubber tube according to claim 1 , wherein a material for the tube is a fluororubber

9 . The rubber tube according to claim 8 , wherein the fluororubber is FKM.

10 . The rubber tube according to claim 1 , which is a tube for a tube pump or a tube for a pinch valve.

11 . A method of producing a rubber tube, the method comprising the steps of:
preparing an outer mold defining an outer shape of the tube and an inner core rod defining an inner surface geometry of the tube; placing the inner core rod along a center line of the outer mold; and molding the rubber tube by the outer mold and the inner core rod; wherein the inner core rod has a surface portion roughened to a predetermined roughness.

12 . The rubber tube producing method according to claim 11 , wherein the roughened surface portion of the inner core rod is to be in contact with a part of an inner surface of the tube excluding 5-mm wide end portions of the tube.

13 . The rubber tube producing method according to claim 11 , wherein the surface portion of the inner core rod is roughened by a shot blast process.

14 . The rubber tube producing method according to claim 13 , wherein a blasting material for the shot blast process is glass beads.

Assignees

• Sumitomo Rubber Ind

Inventors

• Fujimoto Kentaro
• Ishimaru Takeshi

Classifications

• B29C2043/028

  using radial compression · CPC title

• B32B2597/00

  Tubular articles, e.g. hoses, pipes · CPC title

• F16L11/06 Primary

  with homogeneous wall (F16L11/11 takes precedence) · CPC title

• F16L11/04 Primary

  made of rubber or flexible plastics · CPC title

• B29C33/44

  with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles · CPC title