Abstract: The method for setting an operating point of a film stretching system comprises the method steps: acquiring an input, wherein the input contains: a) a target value for the first production variable; or b) a target value for the second production variable; or c) a target value for the third production variable; specifying: a) a setting value for the second production variable and the third production variable in order to achieve the target value for the first production variable; or b) a setting value for the first production variable and the third production variable in order to achieve the target value for the second production variable); or c) a setting value for the first production variable and the second production variable in order to achieve the target value for the third production variable; controlling the motor arrangement and the extruder arrangement by the control device in such a way that the operating point consisting of the target value and two setting values is reached.

Abstract: The present invention relates to a biaxially oriented polyethylene foil (BOPE) comprising layers (A) to (D), wherein layers (B) to (D) contain biaxially oriented polyethylene and layer (A) contains polyurethane and nanoparticles and has a layer thickness of 25 to 300 nm, layer (B) comprises polymers having functional groups which are capable of forming covalent bonds with polyurethane and are directly connected to layer (A), layer (C) has at least a layer thickness of 50% of the total thickness of the foil and layer (D) represents an outer layer of the foil, which contains antiblocking agents. The invention further relates to methods for producing such foils.

Abstract: A film stretching system having the following features: a stretching oven having a plurality of treatment zones through which a plastic foil film can be guided from a feed side to an outlet side through the stretching oven in the drawing-off direction, supply air can be supplied to the respective treatment zone and exhaust air can be discharged therefrom, the ventilation system for the treatment zones is constructed in such a way that exhaust air extracted from the last treatment zone in the drawing-off direction of the plastic foil film is supplied to at least two upstream treatment zones in the drawing-off direction of the plastic foil film, wherein a volume fraction of the exhaust air extracted from the last treatment zone is supplied to only one of the at least two treatment zones and another volume fraction is supplied to only one other of the at least two treatment zones.

Abstract: The invention relates to a biaxially oriented polypropylene film (BOPP) comprising layers (A) to (D), wherein layers (B) to (D) contain biaxially oriented polypropylene and layer (A) contains polyurethane and nanoparticles and has a layer thickness of 25 to 300 nm, layer (B) contains polymers with functional groups that are capable of forming covalent bonds with polyurethane and is directly connected to layer (A), layer (C) has at least a layer thickness of 50% of the total thickness of the film, and layer (D) represents an outer layer of the film containing an anti-blocking agent. The invention also relates to a method for producing films of this type.

Abstract: An improved control apparatus for producing plastic films and an associated improved method are distinguished, inter alia, by the following features: —the control apparatus has two stages or at least two stages, —the control apparatus comprises, for this purpose, a sensor module and/or a sensor model and a process module and/or a process model, —the machine-dependent sensor module and/or sensor model and the production-dependent process module and/or process model are linked or can be linked to one another via production variables, —adjustable machine variables are connected or linked to plant production variables via the sensor module and/or the sensor model.

Abstract: An improved stretching system has the possibility of reducing the distance between two successive guide clips, for example. In technical terms, this is solved by using control clips. For example, a control clip can be provided between two successive guide clips and causes the distance between two successive guide clips to be altered by way of a lateral position adjustment by means of a control rail.

Abstract: An improved device for the uniaxial or biaxial stretching of plastics material portions. The device includes a stretching frame with two pairs of mutually perpendicular guide rails with clips for stretching a plastics material portion, which clips are movable away from or towards each other. The device is constructed such that in addition to the starting position at the beginning of a stretching process and the end position after performing a stretching process, the guide rails and thus the clips seated thereon are additionally movable into a loading position. The loading position is arranged so that it lies asymmetrically within the stretching frame and is thus closer to at least one longitudinal side of the stretching frame than to the opposite side of the stretching frame.

Abstract: The invention relates to a sliding element, in particular for a stretching installation and/or a conveyor chain, comprising graphite or electrographite, wherein the sliding element has pores which have an open pore size of ?7.5% by volume, and wherein the particle size of the graphite particles used as a starting material for the sliding elements is between 3 ?m and 15 ?m.

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: Disclosed is a dual tenter clip and table assembly for moving, by means of an endless chain consisting of alternating pairs of first chain links and pairs of second chain links rotatably connected by pins arranged in parallel to the plane of a rail and perpendicular to the direction of the endless chain's movement, a polymer material web on a stretching plant or stretching device for stretching said polymer material web at least in a transverse direction.

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.