# US 5,702,783 A · Food casing of nonderivatized cellulose

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- Number: US 5,702,783 A
- Document ID: US5702783A
- Status: Granted
- Kind: A
- Application number: 08/515,880
- Filed: 1995-08-16
- Granted: 1997-12-30
- Earliest claimed: 1992-01-17
- Assignees: Viskase Corporation
- Inventors: Myron Donald Nicholson; Edward Makoto Kajiwara; Paul Edmund DuCharme, Jr.
- Web page: https://patentgrep.com/patent/US5702783A

## CPC

- A22C 13/0013: {Chemical composition of synthetic sausage casings}
- B29C 48/10: flexible, e.g. blown foils
- B29C 48/919: {using a bath, e.g. extruding into an open bath to coagulate or cool the material}
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A cellulose food casing comprising a nonderivatized cellulose film precipitated in tubular form from an extruded thermoplastic solution of cellulose, an amine oxide cellulose solvent and water.

## Claims

### Claim 1

A tubular cellulose film comprising a food casing which is a shirred seamless tubular film of nonderivatized cellulose precipitated from an extruded thermoplastic cellulose solution composed of cellulose, a tertiary amine oxide and water, said tubular film having a diameter of at least 14.5 mm containing a water soluble softener and said tubular film having chains of cellulose molecules arranged in a nonrandom fashion such that said chains have order both in the direction of said chains and in a plane normal to the chain direction as manifest by an x-ray diffraction pattern for said film, said pattern having equatorial spots at spacings of about 8.6 .ANG. and about 17.1 .ANG., four meridional arcs at spacings of from about 11.7 .ANG. to about 2.6 .ANG. and a diffuse ring having its equatorial span greater than its meridional span.

### Claim 2 (depends on 1)

A tubular cellulose film as in claim 1 where said four meridional arcs include arcs at about 11.7 .ANG. and 2.7 .ANG..

### Claim 3 (depends on 1)

A tubular cellulose film as in claim 1 wherein said four meridional arcs are at about 11.7 .ANG., 5.9 .ANG., 3.22 .ANG. and 2.7 .ANG..

### Claim 4 (depends on 1)

A tubular cellulose film as in claim 1 wherein said equatorial spots have an intensity level greater than the intensity level of at least two of said meridional arcs.

### Claim 5 (depends on 1)

A tubular cellulose film as in claim 1 wherein on a scale of intensity of weak, medium and strong, said equatorial spots are of a medium intensity.

### Claim 6 (depends on 5)

A tubular cellulose film as in claim 5 wherein said meridional arcs include arcs at 11.7 .ANG. and about 2.6 .ANG. which have a weak intensity.

### Claim 7 (depends on 1)

A tubular cellulosic film as in claim 1 wherein said seamless tubular film is sulfur free.

### Claim 8 (depends on 1)

A tubular cellulosic film as in claim 1 including a paper web in the wall of said seamless tubular film.

### Claim 9 (depends on 1)

A tubular cellulosic film as in claim 1 wherein said thermoplastic solution comprises pulp cellulose dissolved in N-methyl-morpholine-N-oxide (NMMO).

### Claim 10 (depends on 1)

A tubular cellulosic film as in claim 1 wherein said thermoplastic solution comprises 70-80% by weight NMMO, 10-20% by weight cellulose and 5-15% by weight water.

### Claim 11 (depends on 1)

A tubular cellulosic film as in claim 1 wherein said water soluble softener is selected from the group consisting of polyhydric alcohols, polyalkylene oxides, polyalkylene glycols, water and mixtures thereof.

### Claim 12 (depends on 1)

A tubular cellulosic film as in claim 1 wherein said water soluble softener is glycerine.