# US 5,705,109 A · Ozone treatment for composite paperboard/polymer package

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

- Number: US 5,705,109 A
- Document ID: US5705109A
- Status: Granted
- Kind: A
- Application number: 08/636,183
- Filed: 1996-06-20
- Granted: 1998-01-06
- Earliest claimed: 1996-06-20
- Assignees: Westvaco Corporation
- Inventors: Christopher J. Parks
- Web page: https://patentgrep.com/patent/US5705109A

## CPC

- C08J 7/12: Chemical modification
- B29C 49/04: Extrusion blow-moulding
- B29C 49/42414: {Treatment of preforms, e.g. cleaning or spraying water for improved heat transfer}
- B29C 49/46: characterised by using particular environment or blow fluids other than air
- B29C 2049/2404: {inside the article}
- B29C 2049/24306: {using different material for the label and the preform}
- B29C 2791/005: Using a particular environment, e.g. sterile fluids other than air
- B29K 2711/12: Paper, e.g. cardboard
- B29L 2023/00: Tubular articles (B29L2024/00 takes precedence {; catheters B29L2031/7542})
- B29L 2031/744: {Labels, badges, e.g. marker sleeves}
- 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)
- 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)
- 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

In the manufacture of composite paperboard/polymer packages, the adhesion between the polymer component and paperboard component can be enhanced by treating the polymer film with a surface treatment, for example, ozone, before the two components are brought together. The present invention is particularly applicable to a blow molding process employing one or more paperboard blanks and a blow molded polymer film.

## Claims

### Claim 1

The process of manufacturing a blow molded composite paperboard and polymer package comprising the steps:
(a) providing one or more blow mold units, each including respective pairs of mold half sections which together define a blow mold cavity;
(b) inserting and retaining a packaging component of paperboard within each blow mold cavity;
(c) providing a parison of blow moldable polymer material;
(d) treating the outer surface of the parison material of step (c) to increase its level of surface oxidation for enhancing the adhesive bond between the parison and the packaging components in said blow mold cavities;
(e) introducing a treated parison from step (d) into each blow mold cavity;
(f) inflating each parison to cause it to expand and conform with the packaging components located within each blow mold cavity; and,
(g) removing the formed composite packages from the blow mold units.

### Claim 2 (depends on 1)

The process of claim 1 wherein the packaging component of step (b) comprises one or more paperboard blanks.

### Claim 3 (depends on 2)

The process of claim 2 wherein the blow moldable polymer material of step (c) comprises a material selected from the group consisting of polyolefins, blends of polyolefins and other polymer materials, and combinations of polyolefins and polyolefin based materials.

### Claim 4 (depends on 3)

The process of claim 3 wherein the treatment of step (d) is selected from the group consisting of flame, sulfonation and ozone treatment.