Fibrous casing extrusion

Claim 2

In the process of coating moving fibrous web with a liquid supplied from an orifice, the improvement comprising; providing a sufficent orifice opening and providing a volume of said liquid sufficient so as to provide laminar flow of said liquid alongside said moving fibrous web such that penetration of said web by said liquid is fully complete and substantially instantaneous.

Claim 5

The improvement according to claim 1, wherein the ratio of the volume of said liquid in said orifice applied per unit length to said web to the volume of said orifice per unit length is substantially between 0.52 and 0.66.

Claim 6

The improvement according to claim 3 wherein both said orifice and the web are tubular.

Claim 7

The improvement according to claim 4 wherein said process is employed in forming a sausage casing and the liquid is viscose.

Claim 8

A method according to claim 2 wherein the ratio of volume of coating liquid applied per unit length of web to the volume of said coating orifice per said unit length is between on the order of 0.52 and on the order of 0.66 whereby there is complete penetration of said fibrous web by the viscose and flooding is prevented.

Claim 9

A method according to claim 2 wherein the speed of web travel through said coating orifice is on the order of 25 feet per minute and above.

Claim 10

An extrusion coating die comprising an inner die and an outer die arrangement in spaced concentric relation and defining therebetween a coating orifice, said outer die being of a two-piece construction and including first and second plate-like members joined together with an annular space therebetween defining an outside coating liquid supply gap opening into said coating orifice, passage means within said plate-like member defining a supply channel to said outside supply gap, said inner die including an inner support member and two annular elements telescoped over said inner support member with outer portions of said annular elements being axially spaced and defining therebetween an inside coating liquid supply gap opening into said coating orifice, said inner support members extending above said annular elements in supporting relation, passage means within said annular elements defining a supply channel for said inner supply gap, and supply means coupled to one of said annular elements for supplying a coating liquid to said inside supply gap.

Claim 11

An extrusion coating die comprising an inner die and an outer die arrangement in spaced concentric relation and defining therebetween a coating orifice, said outer die being of a two-piece construction and including first and second plate-like members joined together with an annular space therebetween defining an outside coating liquid supply gap opening into said coating orifice, passage means within said plate-like member defining a supply channel to said outside supply gap, said inner die including an inner support member and two annular elements telescoped over said inner support member with outer portions of said annular elements being axially spaced and defining therebetween an inside coating liquid supply gap opening into said coating orifice, said inner support members extending above said annular elements in supporting relation, passage means within said annular elements defining a supply channel for said inner supply gap, and supply means coupled to one of said annular elements for supplying a coating liquid to said inside supply gap.

Claim 12

The coating die of claim 8 wherein said plate-like members have outer annular portions separated by a replaceable gasket, and said gasket defining means for adjusting the height of said outside supply gap.

Claim 13

The coating die of claim 8 wherein said plate-like members have intermediate annular portions disposed in closely spaced relation and defining baffle means in said annular spaced therebetween for coating liquid flowing to said outside supply gap.

Claim 14

The coating die of claim 8 wherein said annular elements have inner annular portions in abutment with separated by a replaceable annular spacer telescoped over said inner support member and defining means for varying the height of said inside supply gap.

Claim 15

The coating die of claim 8 wherein said inner support member forms an inner wall of an annular supply tube forming said supply means for said inner supply gap, and there is an outer tube telescoped over said inner support member forming an outer wall of said annular supply tube, said outer tube having an end secured to said one annular element.

Claim 16

The coating die of claim 8 wherein said inner support member extends below said annular elments and has telescoped thereover below said annular element a tubular support on which a lowermost one of said annular elements is sealed.