Tubular food casing having glued, permanently elastic longitudinal seam

A shirrable, shin stable tubular food casing comprising a coated flat textile support material formed into a tube having a glued, permanently elastic longitudinal seam,

• wherein the seam is bonded via a cured, reactive polyurethane-based hotmelt glue that does not comprise particles,
• the flat support material comprises synthetic fibers, and
• the flat support material is a woven, knit or nonwoven fabric,
• wherein the polyurethane-based hotmelt glue has a softening temperature ranging from 90° C. to below 160° C., a Brookfield viscosity ranging from 3000 to 7000 mPa·s as measured using an RVT DV-11 digital viscosimeter, spindle 27, at 40° C.,
• and the hotmelt glue cure consists of a water-cure,
• at adhesion surfaces at both edges of the textile, at least two lines of glue are applied at a center line distance of 2 to 10 mm apart and
• the glue penetrates into the fibers in the textile support material.

A shirrable, shirr stable tubular food casing

• comprising a coated flat support material formed into a tube having a glued, permanently elastic longitudinal seam,
• wherein the seam is bonded via a polyurethane-based hotmelt glue that does not contain particles,
• the flat support material comprises synthetic fibers,
• the polyurethane-based hotmelt glue has a softening temperature ranging from 90° C. to below 160° C.,
• the polyurethane-based hotmelt glue has a Brookfield viscosity ranging from 3000 to 7000 mPa·s as measured using an RVT DV-11 digital viscosimeter, spindle 27;
• at 40° C., and
• a surface of the casing consisting of one or more of the seam adhesion surfaces has been plasma activated prior to glue application, the glue penetrates into the fibers in the textile support material, and the casing exhibits an at least 60% improvement in mean seam strength compared to casings that have not been plasma activated.