# US 12,108,871 B2 · Brush roller and its manufacturing method and brush roller mold

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- Number: US 12,108,871 B2
- Document ID: US12108871B2
- Status: Granted
- Kind: B2
- Application number: 17/505,352
- Filed: 2021-10-19
- Published: 2022-04-28
- Granted: 2024-10-08
- Earliest claimed: 2020-10-22
- Assignees: Cenefom Corp.
- Applicants: Cenefom Corp.
- Inventors: Chen-Ping Hsu
- Web page: https://patentgrep.com/patent/US12108871B2

## CPC

- A46D 3/00: Preparing, {i.e. Manufacturing} brush bodies
- A46B 1/00: Brush bodies and bristles moulded as a unit
- A46B 13/001: {Cylindrical or annular brush bodies}
- A46B 13/02: power-driven {carriers}
- B29C 33/10: with incorporated venting means
- B29C 39/006: {Monomers or prepolymers (by reaction injection moulding B29C67/246)}
- B29C 39/02: for making articles of definite length, i.e. discrete articles
- B29C 39/26: Moulds or cores
- B29C 39/42: Casting under special conditions, e.g. vacuum
- C08F 16/06: Polyvinyl alcohol {; Vinyl alcohol}
- C08J 3/05: from solid polymers
- C08J 3/24: Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K)
- C08J 9/30: by mixing gases into liquid compositions or plastisols, e.g. frothing with air
- A46B 2200/3073: Brush for cleaning specific unusual places not otherwise covered, e.g. gutters, golf clubs, tops of tin cans, corners
- B29K 2029/04: {PVOH, i.e. polyvinyl alcohol (B29K2031/04 takes precedence)}
- B29K 2105/0002: {monomers or prepolymers}
- B29K 2105/0014: {Catalysts}
- B29L 2031/42: Brushes
- C08F 2810/20: leading to a crosslinking, either explicitly or inherently
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- A46D: MANUFACTURE OF BRUSHES
- A46B: BRUSHES (handles not integral with brushware B25G)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A brush roller and its manufacturing method and brush roller mold is provided, the brush roller is manufactured by foaming a gaseous pore filler, while solving the problem of using a solid pore filler foaming method to manufacture the brush roller. In addition, the brush roller of the present invention has a plurality of fluid channels communicating between any adjacent two, and the plurality of fluid channels respectively extend to the surface of the brush roller to form pores to improve the fluid permeability of the brush roller, and in the brush roller manufacturing method of the present invention, after the PVA emulsified solution is cured, the compressive stress under the condition of the predetermined compression ratio can be formed to meet the expected brush roller, and it can be used to brush the circuit substrate.

## Claims

### Claim 1

A brush roller manufacturing method, which to manufacture a brush roller, comprising the following steps:
preparing a PVA material, a cross-linking agent, a gaseous hole filler, and a brush roller mold;
resolving the PVA material in water to form a PVA aqueous solution;
adding the cross-linking agent into the PVA aqueous solution to allow the PVA material in the PVA aqueous solution for undergoing a cross-linking reaction and forming a PVA cross-linking solution;
adding the gaseous hole filler into the PVA cross-linking solution, and homogenizing the gaseous hole filler and the PVA cross-linking solution by stirring to form a PVA emulsified solution, which comprises bubbles formed by the gaseous hole filler with substantially homogeneous distribution; and
placing the PVA emulsified solution into the brush roller mold until the PVA emulsified solution curing to a solid-state and forming the brush roller with desired compressive stress under the condition of a predetermined compression ratio; meanwhile, any adjacent two of the bubbles with a substantially homogeneous distribution in the PVA emulsified solution will connect to create a plurality of fluid passages on the brush roller, and any adjacent two of the plurality of fluid passages will connect as well and extend to the surface of the brush roller to create pores to provide the flow of fluid.

### Claim 2 (depends on 1)

The brush roller manufacturing method according to claim 1, wherein a catalyst is further prepared and added during the formation of the PVA cross-linking solution or the PVA emulsified solution, thereby the PVA cross-linking solution or the PVA emulsified solution contains the catalyst to catalyze the cross-linking reaction, wherein the weight percentage of the catalyst in the PVA emulsified solution is between 1.5%-5%; the catalyst comprises at least a component selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, and nitric acid.

### Claim 3 (depends on 1)

The brush roller manufacturing method according to claim 1, wherein a surfactant is further prepared and added during the formation of the PVA cross-linking solution or the PVA emulsified solution, thereby the PVA cross-linking solution or the PVA emulsified solution contains the surfactant for maintaining the bubble state in the PVA emulsified solution, wherein the weight percentage of the surfactant in the PVA emulsified solution is between 0.4%-1.4%; the surfactant comprises at least a component selected from the group consisting of polypropylene glycol) diglycidyl ether, polyoxyethylene seearate, polyoxyethylene octylphenyl ether, and sodium dodecyl benzene sulfonate.

### Claim 4 (depends on 1)

The brush roller manufacturing method according to claim 1, wherein the weight percentage of the cross-linking agent in the PVA emulsified solution is between 3%-9%; the cross-linking agent comprises at least a component selected from the group consisting of formaldehyde, acetaldehyde, glyoxal, propanal, butyraldehyde, butanedial, and glutaraldehyde.

### Claim 5 (depends on 1)

The brush roller manufacturing method according to claim 1, wherein the volume ratio of the gaseous hole filler in the PVA emulsified solution is between 31%-45%.

### Claim 6 (depends on 1)

The brush roller manufacturing method according to claim 1, wherein the curing temperature of the PVA emulsified solution is between 42° C.-65° C.

### Claim 7 (depends on 1)

The brush roller manufacturing method according to claim 1, wherein the brush roller mold is rotated to reduce the floating area of the bubbles of the PVA emulsified solution during the curing process of the PVA emulsified solution in the brush roller mold, thereby the bubbles in the PVA emulsified solution maintain the substantially homogeneous distribution.