Drying device and cigarette wrapping paper manufacturing machine using the drying device

Patent metadata

Field	Value
Publication number	US-10172383-B2
Application number	US-201314133207-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Aug 12, 2011
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A drying device having a travel path along which a web (W) of paper travels, a plurality of drying ovens arranged side by side along the travel path, a plurality of conveyor rolls provided in each of the drying ovens to convey the web (W) along the travel path, a plurality of roll units each constituted by one or more of the conveyor rolls and separated from each other along the travel path, and a plurality of conveyor motors connected to the respective roll units to rotate the conveyor rolls, wherein a downstream one of the roll units with respect to the travel path is rotated at a lower rotating speed than an upstream one of the roll units.

First claim

The invention claimed is:

1. A drying device comprising:
a travel path along which a web of paper, applied on one side of the web with a coating liquid by an applicator device, travels, said travel path including an arch section having an upwardly convex configuration with an upstream end and a downstream end; and
a dryer arranged above the arch section of the travel path of the web for drying the web applied with the coating liquid, said dryer including:
an inlet arranged at the upstream end of the arch section;
an outlet arranged at the downstream end of the arch section;
a plurality of drying ovens arranged side by side along the arch section of said travel path, the drying ovens being adjacent to each other;
a plurality of conveyor rolls provided in each of said drying ovens to define the arch section of said travel path and to convey the web along the arch section of said travel path while supporting the other side of the web without coming in contact with the coating liquid on the web;
a plurality of roll units each constituted by one or more of said conveyor rolls and separated from each other along the arch section of said travel path; and
a plurality of conveyor motors connected to said respective roll units to rotate said conveyor rolls,
wherein a downstream one of said roll units with respect to the arch section of said travel path is rotated at a lower rotating speed than an upstream one of said roll units,
wherein the travel path includes a first adjustment roll arranged immediately upstream of the inlet of said dryer, the first adjustment roll being adapted to vary a first tension of the applied web between the applicator device and the dryer in accordance with a measurement result of the first tension of the applied web, and a first pick-up roll arranged between the applicator device and the first adjustment roll for picking up the first tension of the applied web while guiding the applied web, the guide roll and the first adjustment roll allowing the applied web travelling from the applicator device to the inlet of said dryer (i) to be supported only on the other side of the applied web and (ii) to be bent at most at a bend angle less than 90° with respect to a travel direction of the web over an entire region from the applicator device to the inlet of said dryer, and
wherein the travel path further includes a second adjustment roll arranged downstream of the dryer, the second adjustment roll being adapted to vary a second tension of the dried web leaving the dryer in accordance with a measurement result of the second tension of the dried web, and a second pick-up roll arranged between the dryer and the second adjustment roll for picking up the second tension of the dried web while guiding the dried web.

2. The drying device according to claim 1 , wherein the coating liquid is a combustion inhibitor and is applied to a plurality of portions of the web such that the combustion inhibitor-applied portions are regularly spaced in a longitudinal direction of the web and each extend in a width direction of the web.

3. The drying device according to claim 2 , wherein one of said roll units is associated with one of said drying ovens.

4. The drying device according to claim 3 , wherein one of said roll units is associated with two or more of said drying ovens.

5. The drying device according to claim 4 , wherein:
said roll units include a first block located in an upstream section of the arch section of the travel path, and a second block located downstream of the first block, and
the rotating speed of said conveyor rolls of the second block is 97.0% to 99.5% of the rotating speed of said conveyor rolls of the first block.

6. A cigarette wrapping paper manufacturing machine using the drying device according to claim 2 , comprising:
a supply reel arranged at a starting end of said travel path and configured to supply the web;
an applicator device arranged between said supply reel and the drying device and configured to apply the combustion inhibitor which restricts burning of the web;
a wrinkle smoothing device arranged downstream of the drying device and configured to smooth out wrinkles in the web; and
a take-up reel arranged at a terminating end of said travel path and configured to wind the web thereon.

7. The drying device according to claim 1 , wherein:
the applied coating liquid forms bands on the web, said bands being spaced apart from each other in a longitudinal direction of the web and each extending in a width direction of the web.

8. The drying device according to claim 1 , wherein:
said conveyor rolls in each of said drying ovens are consecutively arranged along the arch section of said travel path.

9. The drying device according to claim 1 , wherein:
the first adjustment roll is a suction roll, said suction roll guiding the applied web to said dryer while attracting the other side of the applied web by suction.

10. The drying device according to claim 1 , wherein the web is directly supported by the plurality of conveyor rolls with no intervening structure.

Assignees

• Japan Tobacco Inc

Inventors

• Kida Shinzo
• Fukaya Masaaki

Classifications

• F26B13/12

  Controlling movement, tension or position of material · CPC title

• A24C5/005 Primary

  Treatment of cigarette paper · CPC title

• D21H19/00

  Coated paper (coated fibreboard D21J1/08); Coating material (recording sheets characterised by the coating used to improve ink, dye or pigment receptivity B41M5/50) · CPC title

• F26B13/14

  Rollers, {drums, cylinders}(sorbent surfaces F26B13/26); {Arrangement of drives, supports, bearings, cleaning} · CPC title

• D21H27/00

  Special paper not otherwise provided for, e.g. made by multi-step processes · CPC title