The present disclosure relates to packaging equipment for continuous automatic net sleeving of a casing, a shirring machine and a packaging method. The packaging equipment is provided with a shuttle; a first gripper, capable of being opened or closed to release or clamp and fix the shuttle; a second gripper, capable of driving an open end of the net bag to make reciprocating motion between a first position and a second position on the shuttle when being closed, and capable of allowing the net bag to move freely in a net bag conveying direction when being opened; a third gripper, configured to clamp the open end of the net bag and pull the net bag to sleeve a whole shirred casing in a penetrating mode; and a fourth gripper, configured to pull the net bag, and designed to be capable of moving with the third gripper.

The present disclosure provides a functional additive transferring (co)extruded thermoplastic food casing having a water vapor barrier and/or oxygen barrier effect wherein an inside surface of the thermoplastic food casing has a textured surface which forms a three-dimensional pattern of higher and lower retaining capacity for a functional additive.

The present disclosure relates to packaging equipment for continuous automatic net sleeving of a casing, a shirring machine and a packaging method. The packaging equipment is provided with a shuttle; a first gripper, capable of being opened or closed to release or clamp and fix the shuttle; a second gripper, capable of driving an open end of the net bag to make reciprocating motion between a first position and a second position on the shuttle when being closed, and capable of allowing the net bag to move freely in a net bag conveying direction when being opened; a third gripper, configured to clamp the open end of the net bag and pull the net bag to sleeve a whole shirred casing in a penetrating mode; and a fourth gripper, configured to pull the net bag, and designed to be capable of moving with the third gripper.

The present invention provides a functional additive transferring (co)extruded thermoplastic food casing having a water vapor barrier and/or oxygen barrier effect wherein an inside surface of the thermoplastic food casing has a textured surface which forms a three-dimensional pattern of higher and lower retaining capacity for a functional additive, wherein the thermoplastic food casing having a textured surface in case of a monolayer casing or an inner layer comprising the inside surface having a textured surface in case of a multilayer casing comprises as a main component at least one thermoplastic polymer material selected from the group consisting of (co)polyamides, (co)polyolefins, (co)polyester and vinylidenchloride (co)polymers, wherein the (co)extruded thermoplastic food casing does not comprise a net and/or a material forming a net or any other three dimensional structure on its outside surface, wherein the average thickness of the thermoplastic food casing in the areas having a higher retaining capacity is in a range of from 1 to 100 m, wherein the average thickness of the thermoplastic food casing in the areas having a lower retaining capacity is in a range of from 191 to 2000 m, provided that the thickness difference between the average thickness in the areas having higher retaining capacity and the average thickness in the areas having a lower retaining capacity is in a range of from 160 to 1950 m and that a ratio of the average thickness of the thermoplastic food casing in the areas having a higher retaining capacity and the average thickness of the thermoplastic food casing in the areas having a lower retaining capacity is in a range of from 0.002 to 0.25.