Process for the production of portion packs in a tubular film
In a process for the production of portion packs of viscous to pasty filling material such as sausage meat, grease, putty or cement and the like in a tubular film ( 12 ) which is formed prior to introduction of the filling material ( 10 ) by welding or sealing of the longitudinal edges of a film strip ( 1 ) drawn off a supply and bent into a tubular form, and into which filling material portions are discontinuously introduced under pressure, whereupon the tubular film ( 12 ) is closed with braid formation, the tubular film ( 12 ) is drawn out of the welding or sealing station towards the filling station directly by the filling pressure and film strip ( 1 ) is subsequently drawn along from the supply into the welding or sealing station.
1. A process for the production of portion packs of viscous to pasty filling material in a tubular film, the process comprising the steps of:
a) filling a previously formed portion of tubular film having a previously closed first end with a filling material introduced under pressure by filling means at a filling station;
b) drawing a film strip portion, having a pair of longitudinal ends, off a supply toward a welding station and bending the film strip portion into a tubular form, wherein the step of drawing the film strip portion off the supply is accomplished only by the pressurized filling of the tubular film which is attached to the film strip;
c) stopping the pressurized filling of the tubular film by stopping the filling means when a predetermined amount of filling material has been introduced into the tubular film;
d) forming a portion pack of a predetermined length by closing the tubular film with a braid formation at a predetermined distance from the first closed end of the tubular film while the pressurized filling is stopped;
e) welding or sealing the longitudinal ends of the film strip portion to form an additional portion of tubular film while the pressurized filling is stopped, wherein the step of welding and sealing the longitudinal ends of the film strip portion is accomplished over a film strip length corresponding at least to the portion pack length.
2. The process of claim 1 , wherein the step of welding or sealing the longitudinal ends of the film strip portion comprises the steps of:
pressing a welding or sealing bar against the longitudinal edges of the film strip portion that has been bent into a tubular form; and
lifting the welding or sealing bar when the longitudinal edges of the film strip are welded or sealed together.
3. The process of claim 2 , wherein the step of pressing the welding or sealing bar is accomplished by the following steps:
positioning the bar in a parallel relationship with the longitudinal ends of the film strip that has been bent into tubular form and in a fixed longitudinal position with respect to the movement of the film strip into and out of the welding station;
moving the bar radially toward the longitudinal ends of the film strip until the bar contacts at least one of the longitudinal ends; and
welding or sealing the longitudinal ends of the film strip to each other.
4. The process of claim 2 , wherein the step of lifting the welding or sealing bar is accomplished by the following steps:
moving the bar radially away from the welded or sealed longitudinal ends of the tubular film to a position where the bar is in a parallel relationship with the tubular film.