Abstract: A film is manufactured from a semi-crystalline plastics material by a method with multiple steps. In step a, the film is shaped using a calender, in which a melt coming from a slotted nozzle is introduced into a nip between two cooling or calibrating rollers. The film is calendered between the two cooling or calibrating rollers. In step b, The film is cooled in a cooling section, which has roller pairs arranged one after the other. A film temperature is changed by changing a temperature of downstream rollers, thereby achieving a maximum number of crystallization nuclei. The film temperature is detected using sensors. In step c, the film is cooled down further to a film temperature that allows the film to be spooled. The temperature of the film is kept in a defined temperature range between 128° C. and 138° C. in step b), thereby preventing the automatic formation of further crystals.

Abstract: The invention relates to a device for calibrating and cooling a film or sheet of plastic which comprises at least two cooling or calibrating rolls (1), the rolls being followed by a downstream cooling zone (7). According to the invention, it is in this case provided that the downstream cooling zone (7) comprises pairs of rolls (2, 3, 4) arranged one behind the other. The invention also relates to a method for calibrating and cooling a film or sheet of plastic which comprises the steps of: introducing a film coming from a slot die into the nip between two cooling or calibrating rolls (1), polishing the film (5) between the two cooling or calibrating rolls (1), cooling the film (5) in a cooling zone (7).

Abstract: The invention relates to a device for calibrating and cooling a film or sheet of plastic which comprises at least two cooling or calibrating rolls (1), the rolls being followed by a downstream cooling zone (7). According to the invention, it is in this case provided that the downstream cooling zone (7) comprises pairs of rolls (2, 3, 4) arranged one behind the other. The invention also relates to a method for calibrating and cooling a film or sheet of plastic which comprises the steps of: introducing a film coming from a slot die into the nip between two cooling or calibrating rolls (1), polishing the film (5) between the two cooling or calibrating rolls (1), cooling the film (5) in a cooling zone (7).

Abstract: A package is provided which consists of a container bottom made of thin-walled plastic, a narrow opening edge and a closure made of a sheet, which are joined with high strength and high tightness by heat-sealing in that two separate sealing zones are provided between the two parts, one of which primarily serving to achieve the high mechanical strength and the other primarily serving to achieve a high hermetic seal.

Abstract: Laminated material for thermoplstic articles of different shapes is produced by extrusion of thermoplastic synthetic material layers, one of which layer contains a predetermined amount of an adhesive material dispersed within it prior to being extruded, whereby an adhesive bond of predetermined strength is provided between the layers to suit various requirements in use.