# US 4,397,337 A · Tubular casing suitable for foodstuffs and process for its manufacture

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- Number: US 4,397,337 A
- Document ID: US4397337A
- Status: Granted
- Kind: A
- Application number: 06/324,967
- Filed: 1981-11-25
- Granted: 1983-08-09
- Earliest claimed: 1981-03-07
- Assignees: Hoechst Aktiengesellschaft
- Inventors: Herbert Porrmann; Peter Heidel; Karl Stenger
- Web page: https://patentgrep.com/patent/US4397337A

## CPC

- A22C 13/0013: {Chemical composition of synthetic sausage casings}
- B29C 53/48: for articles of indefinite length, i.e. bending a strip progressively
- B29C 65/08: using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)}
- B29C 66/1122: {Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence)}
- B29C 66/4322: {by joining a single sheet to itself (B29C66/4332 takes precedence)}
- B29C 66/49: {Internally supporting the, e.g. tubular, article during joining (B29C66/63 takes precedence)}
- B29C 66/494: {using an inflatable core}
- B29C 66/721: {Fibre-reinforced materials (B29C66/729 takes precedence)}
- B29C 66/723: {being multi-layered (B29C66/7292, B29C66/72941 take precedence)}
- B29C 66/8266: {using fluid pressure directly acting on the parts to be joined}
- B29C 66/82661: {by means of vacuum}
- B29C 66/836: {Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table (B29C66/65 takes precedence)}
- A22C 2013/0046: {suitable for impregnation with flavouring substances, e.g. caramel, liquid smoke, spices}
- A22C 2013/0059: {thermoplastic casings, casings with at least one layer of thermoplastic material}
- A22C 2013/0069: {seamed casings, casings with at least one longitudinal seam}
- B29C 65/4815: {Hot melt adhesives, e.g. thermoplastic adhesives}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 66/7212: {characterised by the composition of the fibres}
- B29C 66/72141: {Fibres of continuous length}
- B29C 66/72143: {Fibres of discontinuous lengths}
- B29C 66/72328: {Paper}
- B29C 66/72341: {for gases}
- B29C 66/73921: {characterised by the materials of both parts being thermoplastics}
- B29L 2023/002: {Sausage casings}
- Y10T 428/1324: Flexible food casing [e.g., sausage type, etc.]
- A22C: PROCESSING MEAT, POULTRY, OR FISH (preserving A23B; obtaining protein compositions for foodstuffs A23J1/00; fish, meat or poultry preparations A23L; disintegrating, e.g. chopping meat, B02C18/00; preparation of proteins C07K1/00)
- 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)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a tubular casing comprising a fiber-reinforced regenerated cellulose wherein the fiber-reinforcement comprises a fiber web comprising first and second edge regions, parallel to the longitudinal axis, which are overlapped and bonded to form a tube; an impregnation layer of a thermoplastic synthetic resin applied on the entire inwardly-facing surface of the fiber-reinforcement and present in a weight per unit area of less than about 50 g/m.sup.2, the impregnation layer comprising the bond for the edge regions; and a regenerated cellulose surface on the outer surface of the fiber-reinforcement. Also disclosed is a process for manufacturing the tubular casing.

## Claims

### Claim 1

A tubular casing comprising a fiber-reinforced regenerated cellulose wherein the fiber-reinforcement comprises:
a fiber web comprising first and second edge regions, parallel to the longitudinal axis, which are overlapped and bonded to form a tube;
an impregnation layer of a thermoplastic synthetic resin applied on the entire inwardly-facing surface of said fiber-reinforcement before overlapping said edge regions, and present in a weight per unit area of less than about 50 g/m.sup.2, said impregnation layer comprising the bond for said edge regions; and
a regenerated cellulose surface on the outer surface of said fiber-reinforcement applied after overlapping and bonding said edge regions.

### Claim 2 (depends on 1)

A tubular casing as defined in claim 1, wherein said thermoplastic impregnation layer comprises a hot-melt adhesive or a heat-sealable material.

### Claim 3 (depends on 1)

A tubular casing as defined in claim 1, wherein said thermoplastic comprises a polymer or copolymer comprising ethylene and/or propylene or vinylidene chloride.

### Claim 4 (depends on 1)

A tubular casing as defined in claim 1, wherein said thermoplastic comprises a polyamide.

### Claim 5 (depends on 1)

A tubular casing as defined in claim 1, wherein said thermoplastic is present on said fiber-reinforcement in an amount from about 5 to 50 g/m.sup.2.

### Claim 6 (depends on 5)

A tubular casing as defined in claim 5, wherein said thermoplastic is present on said fiber-reinforcement in an amount from about 5 to 20 g/m.sup.2.

### Claim 7 (depends on 1)

A tubular casing as defined in claim 1, wherein said fiber web comprises a non-woven paper fiber web comprising a weight per unit area from about 17 to 27 g/m.sup.2.

### Claim 8 (depends on 1)

A tubular casing as defined in claim 1, wherein said thermoplastic impregnation layer comprises a continuous layer.

### Claim 9 (depends on 1)

A tubular casing as defined in claim 1, wherein said thermoplastic impregnation layer comprises a discontinuous impregnation.

### Claim 10 (depends on 1)

A tubular coating as defined in claim 1, further comprising an adhesion-promoting layer for anchoring said thermoplastic impregnation layer to said fiber web.

### Claim 11 (depends on 1)

A tubular casing as defined in claim 1, further comprising a gas-impermeable layer comprising a vinylidene resin on the inside surface of said tubular casing.

### Claim 12 (depends on 11)

A tubular casing as defined in claim 11, further comprising an adhesion-promoting layer for anchoring said gas-impermeable layer to said thermoplastic impregnation layer.

### Claim 13 (depends on 11)

A tubular casing as defined in claim 11, wherein said layer of vinylidene resin comprises a weight per unit area of about 3 to 12 g/m.sup.2.

### Claim 14 (depends on 12)

A tubular casing as defined in claim 12, wherein said adhesion-promoting layer comprises a water-insoluble resin.

### Claim 15 (depends on 1)

A tubular casing as defined in claim 1, which has been shirred.