Film roll and method for producing film roll

Patent metadata

Field	Value
Publication number	US-10457520-B2
Application number	US-201715413633-A
Country	US
Kind code	B2
Filing date	Jan 24, 2017
Priority date	Jan 25, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

In order to provide a film roll that includes a core having improved rigidity without increasing a cost, the present invention provides a film roll including: a cylindrical core; and a film wound around an outer peripheral surface of the core, the core satisfying the following inequality: D×0.0017+0.50<T1/T2<D×0.0017+0.95, wherein D (mm) denotes a difference between an outer diameter of the core and an inner diameter of the core, T1 (mm) denotes a thickness of an outer peripheral part, and T2 (mm) denotes a thickness of an inner peripheral part.

First claim

The invention claimed is:

1. A film roll comprising:
a cylindrical core; and
a film wound around an outer peripheral surface of the core,
the core including:
a ring-shaped outer peripheral part defining an outer diameter of the core;
a ring-shaped inner peripheral part, provided inside the outer peripheral part, defining an inner diameter of the core; and
a plurality of ribs which extend between the outer peripheral part and the inner peripheral part in a direction of a radius of the core so as to connect the outer peripheral part and the inner peripheral part,
the ring-shaped inner peripheral part and the ring-shaped outer peripheral part each being substantially uniform in thickness,
the core satisfying the following inequality:
D× 0.0017+0.63< T 1/ T 2< D× 0.0017+0.93,

wherein D (mm) denotes a difference between the outer diameter of the core and the inner diameter of the core, T1 (mm) denotes a thickness of the outer peripheral part, and T2 (mm) denotes a thickness of the inner peripheral part.

2. The film roll according to claim 1 , wherein
the plurality of ribs comprises eight ribs provided at equal intervals along a circumference of the core, and
the core satisfies the following inequality:
0.5≤ T 2/ T 3≤2.3,

wherein T3 (mm) is a thickness of a corresponding one of the ribs.

3. The film roll according to claim 2 , wherein
the difference, D (mm), between the outer diameter of the core and the inner diameter of the core is not less than 128.2 mm and not more than 229.8 mm, and
the core satisfies the following inequality:
0.8≤ T 2/ T 3≤2.3.

4. The film roll according to claim 1 , wherein
the plurality of ribs comprises eight ribs provided at equal intervals along a circumference of the core, and
the core satisfies the following inequality:
0.5 ≤T 1 /T 3≤5,

wherein T3 (mm) is a thickness of a corresponding one of the ribs.

5. The film roll according to claim 4 , wherein
the difference, D (mm), between the outer diameter of the core and the inner diameter of the core is not less than 77 mm and not more than 128.2 mm, and
the core satisfies the following inequality:
0.5≤ T 1/ T 3≤1.4.

6. The film roll according to claim 4 , wherein
the difference, D (mm), between the outer diameter of the core and the inner diameter of the core is not less than 179 mm and not more than 229.8 mm, and
the core satisfies the following inequality:
1.8≤ T 1/ T 3≤5.

7. The film roll according to claim 1 , wherein
the inner diameter of the core is 3 inches, and the outer diameter of the core is not less than 6 inches and not more than 12 inches.

8. A method for producing a film roll, the film roll comprising: a cylindrical core; and a film wound around an outer peripheral surface of the core,
the method comprising the step of:
winding the film around the outer peripheral surface of the core, the core including: a ring-shaped outer peripheral part defining an outer diameter of the core; a ring-shaped inner peripheral part, provided inside the outer peripheral part, defining an inner diameter of the core; and a plurality of ribs which extend between the outer peripheral part and the inner peripheral part in a direction of a radius of the core so as to connect the outer peripheral part and the inner peripheral part,
the ring-shaped inner peripheral part and the ring-shaped outer peripheral part each being substantially uniform in thickness,
the core satisfying the following inequality:
D× 0.0017+0.63< T 1/ T 2< D× 0.0017+0.93,

wherein D (mm) denotes a difference between the outer diameter of the core and the inner diameter of the core, T1 (mm) denotes a thickness of the outer peripheral part, and T2 (mm) denotes a thickness of the inner peripheral part.

Assignees

• Sumitomo Chemical Co

Inventors

• Sakamoto Akinobu

Classifications

• B65H75/10 Primary

  without flanges, e.g. cop tubes · CPC title

• B65H75/18

  Constructional details · CPC title

• B65H2701/5122

  Plastics · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2/1653

  Electricity · mapped topic