Abstract: Closure clips and a process for the production of closure clips of strip-form or wire-form material for the closure of tubular or bag-like packagings. In the process, a substantially wave-form profile with successive first and second apex points is stamped along the strip-form or wire-form material, the first apex point forming a clip bottom, flanks respectively adjoining the first apex point on each side thereof form clip limbs that are bent over in a U-shape and the second apex point forms limb ends that are bent over outwardly with respect to the U-shape at which two adjacent closure clips are separably connected. The strip-form or wire-form closure clip material is pierced inwardly with respect to the U-shape so that a raised material portion is formed at the limb inside.

Abstract: Closure clips and a process for the production of closure clips of strip-form or wire-form material for the closure of tubular or bag-like packagings. In the process, a substantially wave-form profile with successive first and second apex points is stamped along the strip-form or wire-form material, the first apex point forming a clip bottom, flanks respectively adjoining the first apex point on each side thereof form clip limbs that are bent over in a U-shape and the second apex point forms limb ends that are bent over outwardly with respect to the U-shape at which two adjacent closure clips are separably connected. The strip-form or wire-form closure clip material is pierced inwardly with respect to the U-shape so that a raised material portion is formed at the limb inside.

Abstract: Closure clips and a process for the production of closure clips of strip-form or wire-form material for the closure of tubular or bag-like packagings. In the process, a substantially wave-form profile with successive first and second apex points is stamped along the strip-form or wire-form material, the first apex point forming a clip bottom, flanks respectively adjoining the first apex point on each side thereof form clip limbs that are bent over in a U-shape and the second apex point forms limb ends that are bent over outwardly with respect to the U-shape at which two adjacent closure clips are separably connected. The strip-form or wire-form closure clip material is pierced inwardly with respect to the U-shape so that a raised material portion is formed at the limb inside.

Abstract: An extruder for processing of thermoplastics has a housing (1) in which a screw is pivotally supported. A land (5) which runs in a helical line protrudes from the core (4) of the screw. There is at least one ventilation opening in the housing in which the screw is pivotally supported. The land (5) of the screw at least in the area of the ventilation opening has an active flank, i.e. one which points toward the discharge end of the extruder and which encloses with the axis of the screw an acute angle such that at least in areas it is set back relative to a radial plane which passes through the outside edge (14) of the active flank (10). This prevents the plastic which is to be processed in the extruder from being pressed to the outside and clogging the ventilation opening.

Abstract: An extruder for processing of thermoplastics has a housing (1) in which a screw is pivotally supported. A land (5) which runs in a helical line protrudes from the core (4) of the screw. There is at least one ventilation opening in the housing in which the screw is pivotally supported. The land (5) of the screw at least in the area of the ventilation opening has an active flank, i.e. one which points toward the discharge end of the extruder and which encloses with the axis of the screw an acute angle such that at least in areas it is set back relative to a radial plane which passes through the outside edge (14) of the active flank (10). This prevents the plastic which is to be processed in the extruder from being pressed to the outside and clogging the ventilation opening.