Convolute tube

Patent metadata

Field	Value
Publication number	US-10836131-B2
Application number	US-201716314520-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Nov 18, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A convolutely wound tube ( 1 ) is formed of a composite sheet including a first sheet ( 6 ) and a second sheet ( 5 ). The convolutely wound tube includes a first segment ( 66 ) formed of a plurality of convolute windings ( 2 ) of the first sheet, a second segment ( 70 ) formed of directly adhered and overlapping portions of the first sheet and the second sheet, and a third segment ( 68 ) formed of the second sheet wrapped about and overlying the first sheet. The second segment is an underwrap portion positioned between a layer of the first sheet and a layer of the second sheet.

First claim

The invention claimed is:

1. A convolutely wound tube formed of a composite sheet including a first sheet and a second sheet, the convolutely wound tube comprising:
a first segment formed of a plurality of convolute windings of the first sheet;
a second segment formed of directly adhered and overlapping portions of the first sheet and the second sheet; and
a third segment formed of the second sheet wrapped about and overlying the first sheet, the second segment being an underwrap portion positioned between a layer of the first sheet and a layer of the second sheet.

2. The convolutely wound tube of claim 1 , wherein a width (W 22 ) of the second segment satisfies formula (1) and a width (W 23 ) of the second sheet satisfies formula (2):
W 22 ≥R* 8 mm  (1)

W 23 ≥W 22 +(π*OD 6 )+( R* 20 mm)  (2),

wherein R is a ratio of a thickness of the first sheet to a thickness of the second sheet, and
wherein OD 6 is a theoretical outer diameter of a convolute tube if formed only of the first sheet without the second sheet.

3. The convolutely wound tube of claim 2 , wherein the thickness of the second sheet is smaller than the thickness of the first sheet.

4. The convolutely wound tube of claim 3 , wherein the ratio R is between 2 and 5.

5. The convolutely wound tube of claim 1 , wherein the third segment is formed of at least one convolute winding of the second sheet which overlies a layer of the first sheet and the second segment.

6. The convolutely wound tube of claim 5 , wherein the third segment further comprises a portion of the second sheet overlying the at least one convolute winding of the second sheet.

7. The convolutely wound tube of claim 1 , wherein the first sheet has a first edge defining an inner edge of the tube and an opposing second edge.

8. The convolutely wound tube of claim 1 , wherein the second sheet has a first edge and an opposing second edge, the second edge of the second sheet defining an outer seam of the convolutely wound tube, the underwrap portion including the first edge of the second sheet and the third segment including the second edge of the second sheet.

9. The convolutely wound tube of claim 1 , wherein the underwrap portion is an adhesively secured lap seam joining the first and second sheets.

10. The convolutely wound tube of claim 1 , wherein the first sheet is formed of a paper material.

11. The convolutely wound tube of claim 1 , wherein the second sheet is formed of a paper material.

12. A convolutely wound tube formed of a composite sheet including a first sheet, a second sheet and a third sheet, the convolutely wound tube comprising:
a first segment formed of a plurality of convolute windings of the first sheet;
a second segment formed of directly adhered and overlapping portions of the first sheet and the second sheet;
a third segment formed of the second sheet wrapped about and overlying the first sheet, the second segment being an underwrap portion positioned between a layer of the first sheet and a layer of the second sheet; and
a fourth segment formed of at least one convolute winding of the third sheet which is secured between an underlying convolute winding of the first sheet and an overlying convolute winding of the first sheet.

13. The convolutely wound tube of claim 12 , wherein a width (W 22 ) of the second segment satisfies formula (1) and a width (W 23 ) of the second sheet satisfies formula (2):
W 22 ≥R* 8 mm  (1)

W 23 ≥W 22 +(π*OD 6 )+( R* 20 mm)  (2).

14. The convolutely wound tube of claim 13 , wherein the ratio R is between 2 and 5.

15. The convolutely wound tube of claim 13 , wherein a thickness of the third sheet is smaller than the thickness of the second sheet.

16. The convolutely wound tube of claim 12 , wherein the first sheet is formed of a paperboard material.

17. The convolutely wound tube of claim 16 , wherein the second sheet is formed of a paper material, the thickness of the second sheet being smaller than the thickness of the first sheet.

18. The convolutely wound tube of claim 12 , wherein the third sheet is made of a moisture resistant material.

19. The convolutely wound tube of claim 12 , wherein a reminder portion the third sheet overlaps the at least one convolute winding of the third sheet by a distance of at least 90° of the circumference of the at least one convolute winding of the third sheet.

Assignees

• Heraeus Electro Nite Int

Inventors

• Spanjers Maarten
• Siemons Wouter

Classifications

• B32B29/005

  next to another layer of paper or cardboard layer · CPC title

• B32B1/08

  Tubular products · CPC title

• B31C1/00 Primary

  Making tubes or pipes by feeding at right angles to the winding mandrel centre line · CPC title

• F16L11/00

  Hoses, i.e. flexible pipes · CPC title

• B65H81/06

  Covering or wrapping elongated cores · CPC title