Abstract: An improved method and an associated improved device for operating a linear-motor-driven simultaneous stretching installation is distinguished inter alia by the following features: during normal operation, the linear-motor-driven transporting units in the simultaneous stretching zone are subjected to an acceleration phase with a normal-operation acceleration profile involving a growing increase in the distance from a following transporting unit driven by the linear motor drive; when the web of material is moved into the stretching zone, at least two leading tenters, following one another and driven by the linear motor, are accelerated in the stretching zone in such a way that differs from the normal-operation acceleration profile that the distance formed between the at least two tenters following one another and driven by the linear motor is less than 80% or less than 75% of the distance that is brought about during normal operation.

Abstract: An improved linear-motor-operated conveying system is distinguished, inter alia, by the following features: the conveyed web can be fixed to the nipper part, as a result of which a conveyed web plane is defined, said film plane being arranged at a height with respect to the motor working side of the single linear motor drive or of the more powerful linear motor drive in the case of two linear motor drives, and said height being less than or equal to the length of the secondary parts on the conveying parts; the conveying system comprises either a) only one linear motor drive provided beneath the conveying part, or b) only one linear motor drive provided above the conveying part, or c) one linear motor drive arranged beneath and one arranged above the conveying part, the upper linear motor drive and/or the associated control system being configured in such a manner that the upper linear motor drive can only be operated with a maximum power of 75% in relation to the maximum power of the lower linear motor drive.

Abstract: An improved guide rail in particular for a transport device or stretching unit is distinguished inter alia by the following features—the cooling device comprises at least one cooling duct which extends in a zigzag shape inside the guide rail and which is formed by connected transverse bores, and/or—the guide rail comprises at least two half-shells or halves between which a flexible tube is arranged in a sandwich-like manner to form at least one cooling duct, and/or—at least one cooling duct is arranged outside the guide rail so as to extend parallel thereto, and, in the longitudinal direction of the guide rail, in each case bores extending transversely thereto are made, into which bores outwardly projecting heat lines and/or heat pipes are inserted.

Abstract: The invention relates to an improved method and to an improved device for degassing polymer melts and for neutralizing the thus produced pollutants, characterised by the following characteristics: said pollutants are guided to a plasma source after removal from the degassing area and prior to adding to a filter step or a separator, said plasma source being built and/or formed such that in said plasma source, the pollutants are transformed, entirely or partially, in a plasma aggregate state.

Abstract: Machine for stretching films, comprising two tracks each having a first rail (1) on which clips (3) move and close together at a point for adjusting their pitch and a second rail (2) on which articulated carriages (5) move, in a chain driven by a toothed drive wheel (6), with two consecutive clips (3) respectively, characterised by a wheel (8) for indexing the point for adjusting the pitch of the clips (3).

Abstract: An improved linear-motor-operated conveying system is distinguished, inter alia, by the following features: the conveyed web can be fixed to the nipper part, as a result of which a conveyed web plane is defined, said film plane being arranged at a height with respect to the motor working side of the single linear motor drive or of the more powerful linear motor drive in the case of two linear motor drives, and said height being less than or equal to the length of the secondary parts on the conveying parts; the conveying system comprises either a) only one linear motor drive provided beneath the conveying part, or b) only one linear motor drive provided above the conveying part, or c) one linear motor drive arranged beneath and one arranged above the conveying part, the upper linear motor drive and/or the associated control system being configured in such a manner that the upper linear motor drive can only be operated with a maximum power of 75% in relation to the maximum power of the lower linear motor drive.

Abstract: The invention relates to an improved transporting unit for a transporting device, in particular for a transverse, longitudinal, and/or simultaneous stretching installation, wherein transporting units (KT) can be moved along a guiding and/or supporting rail by means of a clip unit (KL) and a drive unit (AT) connected to the clip unit, is characterized by the following features: the clip transporting unit (KT) or the clip unit (KL) and/or the drive unit (AT) has, for example, a volume or weight fraction of at least 60% that consists of a forged part (ST) and/or is composed of a forging blank (SR).

Abstract: An improved device for degassing polymer melts is characterised by, inter alia, the following features: the at least one vacuum separator comprises cooling pipes extending parallel to each other in the tank interior of the vacuum separator housing, the cooling pipes are double-walled, the cooling pipes end at a distance above a collection chamber or above the tank bottom of the vacuum separator housing, and a cleaning device having a scraper or a wiper is provided, said cleaning device being adapted to the cross-sectional shape of the cooling pipes and preferably to the course of the inner wall of the vacuum separator housing and being movable at least in a partial height at least to the lower end of the cooling pipes.

Abstract: An improved adjustable-angle pressing or nip roll is distinguished, inter alia, by the following features: the angle adjusting device comprises a double-armed lever, the moving device is constructed in such a way that, via this, a pivot axis of the double-armed lever can be adjusted relative to the process roll, and the angle adjusting device comprises, for the double-armed lever, a stop which acts at least on one side, in such a way that, in the case of further force loading by the force actuating unit, a pressing force can be generated which acts on the pivot axis of the double-armed lever and via which the pressing or nip roll can be pressure-loaded onto the roll shell of the process roll with the material web being guided through between the two rolls.

Abstract: An improved gripper with a toggle lever arrangement is characterized by, among others, the following features —the gripper comprises a gripper lever which is pivotable with respect to a gripper holder around a gripper axis, —the gripper lever is configured as a toggle lever and comprises in addition a first and a second toggle lever leg which are pivotable relative to each other around a toggle lever axis, —in addition a force application unit is provided which acts on the second toggle lever leg pivotable around the toggle lever axis and/or on the toggle lever flap, —the force application unit is thereby configured such that during pivoting of the gripper lever from the release position into the closed- and clamping position thereof, the toggle lever flap initially touches down on the side of the gripper table lying away from the material web while prefixing the material web in this region, before the toggle lever flap reaches the final closed- and clamping position thereof during the remaining pivoting proc

Abstract: The invention relates to an improved transport system, in particular for a stretching system, characterized amongst other things, by the following characteristics: a support rail and/or a guide rail, over which a conveyor chain with clip chain units can be displaced, are provided, said units subdividing into a clip part and a chain part, said support rail or the guide rail or the support rail and the guide rail is/are provided with a channel which transverses in the longitudinal direction at least in one of the partial lengths of the support rail and the guide rail.

Abstract: The invention relates to an improved stretching unit characterized, amongst other things by the following: the clip-chain unit is designed such that the forces which are exerted are decoupled and applied in a tilting-free and torque-free manner to the clip-chain unit in order to prevent an increase of the surface pressure between the clip-chain unit and the supporting rail.

Abstract: The invention relates to an improved clip/transport unit, characterized by the following features, among others: the clip/transport unit is divided into a clip part and a transport part, the clip/transport unit has a volume or weight fraction of at least 25% composed of one or more composite materials.

Abstract: An improved linear-motor-operated conveying system is distinguished, inter alia, by the following features: the conveyed web can be fixed to the nipper part, as a result of which a conveyed web plane is defined, said film plane being arranged at a height with respect to the motor working side of the single linear motor drive or of the more powerful linear motor drive in the case of two linear motor drives, and said height being less than or equal to the length of the secondary parts on the conveying parts; the conveying system comprises either a) only one linear motor drive provided beneath the conveying part, or b) only one linear motor drive provided above the conveying part, or c) one linear motor drive arranged beneath and one arranged above the conveying part, the upper linear motor drive and/or the associated control system being configured in such a manner that the upper linear motor drive can only be operated with a maximum power of 75% in relation to the maximum power of the lower linear motor drive.

Abstract: An improved multiple-screw extruder, in particular a twin-screw extruder comprises a housing. Several housing bores are located in at least one section within the housing. The housing bores overlap at least along a partial axial length of the housing. One extruder screw is arranged in each of the several housing bores. At least two motors are provided for the at least two extruder screws. A synchronizing and torsion transmitting device, by means of which both cooperating extruder screws can be synchronized, is provided on both the inlet side and the discharge side.

Abstract: The invention relates to an improved stretching unit characterised, amongst other things by the following: the clip-chain unit is designed such that the forces which are exerted are decoupled and applied in a tilting-free and torque-free manner to the clip-chain unit in order to prevent an increase of the surface pressure between the clip-chain unit and the supporting rail.

Abstract: The invention relates to a high-strength and brilliant quality barrier film for packing purposes, in particular for food packaging embodied in the form of a multilayer film based on of at least one carrier layer consisting of a biaxially oriented polypropylene film (PP-film) and of a functional layer based on amorphous and partially-crystalline polyamide (PA) which is produced by simultaneously stretching a primary multilayer coextruded film, wherein said polyamide functional layer consists of an external film layer and a central internal layer placed between two carrier layers. Methods for the production of the inventive film and the uses thereof are also disclosed.

Abstract: Barrier film for use in packaging, particularly for the packaging of foods and tobacco, in the form of a multi-layer film based on a biaxially oriented polyolefin film having at least one coextruded functional layer or barrier based on ethylene-vinyl alcohol copolymers (EVOH), which is produced by simultaneous drawing of a coextruded multi-layer primary film at temperatures of 145° C. and below, the ethylene content of the EVOH being below 40 mol % and the thickness of the EVOH layer being less than 5 ?m, in particular less than 2 ?m, thereby producing values for the oxygen permeability at 23° C. and 75% relative humidity (OTR; ASTM 3985) of better than 10 cm3/m2dbar, preferably better than 5 cm3/m2dbar.

Abstract: A device drives a preheating roll assembly comprising several rolls, during a heating or preheating stage. A motor assembly includes at least one individual drive and preferably two individual drives, which are used to drive at least the exit roll and preferably the entry roll and the exit roll. The motor assembly also includes one or more asynchronous motors, each asynchronous motor controlling the surface speed and the torque of one of the intermediate rolls. A common frequency converter operates one or more asynchronous motors, in particular all asynchronous motors.

Abstract: The invention relates to a high-strength and brilliant quality barrier film for packing purposes, in particular for food packaging embodied in the form of a multilayer film based on of at least one carrier layer consisting of a biaxially oriented polypropylene film (PP-film) and of a functional layer based on amorphous and partially-crystalline polyamide (PA) which is produced by simultaneously stretching a primary multilayer coextruded film, wherein said polyamide functional layer consists of an external film layer and a central internal layer placed between two carrier layers. Methods for the production of the inventive film and the uses thereof are also disclosed.