# US 2021/0276050 A1 · Sheet manufacturing apparatus

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0276050 A1
- Document ID: US20210276050A1
- Status: Published application
- Kind: A1
- Application number: 16/328,368
- Filed: 2017-08-21
- Published: 2021-09-09
- Earliest claimed: 2016-08-31
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Yoshiyuki NAGAI
- Web page: https://patentgrep.com/patent/US20210276050A1

## CPC

- D21F 9/00: Complete machines for making continuous webs of paper
- B08B 1/10: characterised by the type of cleaning tool
- B08B 1/165: {Scrapers}
- B08B 1/20: Cleaning of moving articles, e.g. of moving webs or of objects on a conveyor
- B08B 1/30: by movement of cleaning members over a surface
- D04H 1/732: by fluid current, e.g. air-lay
- D21F 3/0281: {in combination with a dryer roll}
- D21F 3/08: Pressure rolls
- D21F 5/022: {Heating the cylinders}
- D21G 1/0073: {Accessories for calenders}
- H05B 3/00: Ohmic-resistance heating
- D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- D21G: CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions B65H)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A sheet manufacturing apparatus includes: a second web former that forms a web of defibrated substances obtained by defibrating a raw material containing fibers; and a sheet former that forms a sheet of the web formed by the second web former. The sheet former has a former roller unit and a cleaning unit that has an oil impregnated web for cleaning a roller surface of the former roller unit.

## Claims

### Claim 1

A sheet manufacturing apparatus comprising:
a web former that forms a web of defibrated substances obtained by defibrating a raw material containing fibers; and
a sheet former that forms a sheet of the web formed by the web former,
wherein the sheet former has a former roller unit that pressurizes and heats the web formed by the web former so as to form a sheet and a cleaning unit that has an oil impregnated web for cleaning a roller surface of the former roller unit.

### Claim 2 (depends on 1)

The sheet manufacturing apparatus according to claim 1,
wherein the cleaning unit has a web delivery roller that delivers the oil impregnated web, a web winding roller around which the oil impregnated web is wound, and a web press-contact roller that is disposed between the web delivery roller and the web winding roller and comes into press contact with the roller surface of the former roller unit via the oil impregnated web.

### Claim 3 (depends on 1)

The sheet manufacturing apparatus according to claim 1,
wherein the former roller unit has a pressurizing roller pair, and wherein rollers of the pressurizing roller pair are each provided with the cleaning unit.

### Claim 4 (depends on 3)

The sheet manufacturing apparatus according to claim 3,
wherein the former roller unit has a scraping blade that removes attached matter on the roller surface of the pressurizing roller pair, and
wherein the cleaning unit performs cleaning on an upstream side of the scraping blade.

### Claim 5 (depends on 3)

The sheet manufacturing apparatus according to claim 3,
wherein the former roller unit has a scraping blade that removes attached matter on the roller surface of the pressurizing roller pair, and
wherein the cleaning unit performs cleaning on a downstream side of the scraping blade.

### Claim 6 (depends on 1)

The sheet manufacturing apparatus according to claim 1,
wherein the former roller unit has a heating roller pair, and
wherein rollers of the heating roller pair are each provided with the cleaning unit.

### Claim 7 (depends on 6)

The sheet manufacturing apparatus according to claim 6, further comprising:
an external heating roller that heats at least one heating roller of the heating roller pair from outside,
wherein the cleaning unit performs cleaning on an upstream side of the external heating roller.

### Claim 8 (depends on 1)

The sheet manufacturing apparatus according to claim 1,
wherein the oil impregnated web of the cleaning unit is conveyed in a reverse direction of a roller rotating direction of the former roller unit.

### Claim 9 (depends on 1)

The sheet manufacturing apparatus according to claim 1,
wherein the oil impregnated web of the cleaning unit is conveyed intermittently.

### Claim 10 (depends on 1)

The sheet manufacturing apparatus according to claim 1,
wherein the cleaning unit is replaceable on a unit basis.