Film winding core, and wound film body using same

Patent metadata

Field	Value
Publication number	US-9346652-B2
Application number	US-201214004336-A
Country	US
Kind code	B2
Filing date	Mar 9, 2012
Priority date	Mar 11, 2011
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A film winding core ( 10 ) of the present invention includes a bearing portion ( 12 ), a plurality of blade portions 13 , and a plurality of film supporting portions ( 14 ). The bearing portion ( 12 ) constitutes a tubular portion into which a shaft used to rotate the film winding core ( 10 ) is to be inserted. The plurality of blade portions ( 13 ) are provided respectively at a plurality of positions in a rotational direction of the bearing portion ( 12 ) and respectively extending outwardly from the bearing portion ( 12 ) so as to partition a space around the bearing portion ( 12 ) in the rotational direction. The plurality of film supporting portions ( 14 ) are respectively provided at positions outward from leading edges of the blade portions ( 13 ), and has an outwardly protruding shape so that a film ( 18 ) is supported away from the film winding core ( 10 ) between the film supporting portions ( 14 ) that are adjacent to each other in the rotational direction.

First claim

The invention claimed is:

1. A film winding core on which a long film is to be wound, comprising:
a tubular bearing portion into which a shaft used to rotate the film winding core is to be inserted;
a plurality of blade portions provided respectively at a plurality of positions in a rotational direction of the bearing portion, the plurality of blade portions respectively extending outwardly from the bearing portion so as to partition a space around the bearing portion in the rotational direction;

a plurality of film supporting portions respectively provided at positions outward from leading edges of the blade portions, the plurality of film supporting portions having an outwardly protruding shape so that the film is supported away from the film winding core between the film supporting portions that are adjacent to each other in the rotational direction, and
a rim portion located on the leading edges of the blade portions, the rim portion having a tubular shape that surrounds the bearing portion in the rotational direction, wherein
the film supporting portions are fixed to the rim portion,
the rim portion is fixed to the bearing portion by the blade portions,
each of the blade portions has a rectangular plate shape, the rim portion is located on one side of the blade portions, and the bearing portion is located on another side of the blade portions,
both the film supporting portions and the blade portions extend from one side of the bearing portion to another side of the bearing portion in a direction parallel to a rotational axis of the film winding core, and
the bearing portion, the blade portions, the rim portion, and the film supporting portions have a same length in the direction parallel to the rotational axis.

2. The film winding core according to claim 1 , wherein the bearing portion and the blade portions are integrated with each other.

3. The film winding core according to claim 1 , wherein the film supporting portions are each made of a material that can be deformed when the film is wound on the film winding core.

4. The film winding core according to claim 3 , wherein the material is an elastically deformable material.

5. The film winding core according to claim 3 , wherein the material comprises at least one selected from the group consisting of sponge, rubber, and foam.

6. The film winding core according to claim 3 , wherein the material is urethane foam.

7. The film winding core according to claim 1 , wherein a longitudinal direction of each of the film supporting portions is parallel to the rotational axis of the film winding core.

8. The film winding core according to claim 1 , wherein each of the film supporting portions has a shape of a semicircular column, a rectangular column, or a hollow semicircular column.

9. A wound film body comprising:
the film winding core according to claim 1 ; and
a film wound on the film winding core.

10. The wound film body according to claim 9 , wherein the film is a porous resin membrane.

11. The film winding core according to claim 1 , wherein
the rim portion has a polygonal shape in a cross-section perpendicular to the rotational axis of the film winding core, the polygonal shape defining corners,
the leading edges of the blade portions and the film supporting portions are located respectively at the corners of the rim portion, and
the film supporting portions have a shape fitted to the corners of the rim portion.

Assignees

• Noumi Shunsuke
• Sayanagi Shunichirou
• Nitto Denko Corp

Inventors

• Noumi Shunsuke
• Sayanagi Shunichirou

Classifications

• B65H75/04

  Kinds or types (B65H75/18 takes precedence) · CPC title

• B65H2701/535

  Dimensional aspect, e.g. non-cylindrical cores · CPC title

• B65H18/28 Primary

  Wound package of webs · CPC title

• B65H75/08 Primary

  of circular or polygonal cross-section (cans or receptacles B65H75/16) · CPC title

• B65H2701/37

  Tapes · CPC title