A tool comprises a first rod that extends along a first axis and moves perpendicular to the first axis along a second axis. A first sliding guide moves along the first rod. A second rod extends parallel to the second axis and moves perpendicular to the second axis and parallel to the first axis, and a second sliding guide moves along the second rod. A third rod extends along a third axis and moves perpendicular to the third axis and parallel to the second axis, and a third sliding guide moves along the third rod. A fourth rod extends along a fourth axis and moves perpendicular to the fourth axis and parallel to the first axis, and a fourth sliding guide moves along the fourth rod. The periphery of the sensor network film is secured to the rods, and the rods and guides move simultaneously to stretch the film.

A tensioning device for a sheet of material that includes a first ring with protrusions, a second ring, and a shaft. The first ring and the second ring are positioned such that the sheet of material can be clamped between the first ring and the second ring. The shaft has an outer surface, the outer surface includes a spiral race such that the protrusions of the first ring follow the spiral race, allowing the first ring and the second ring to displace linearly causing the sheet of material to be stretched. The spiral race includes a plurality of notches that correspond to the protrusions.

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.

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.

An improved guide rail in particular for a transport device or stretching unit is distinguished inter alia by the following featuresthe 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/orthe 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/orat 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.

A method and an apparatus are directed to stretching plastic films. The plastic film is held at at least two opposite longitudinal sides by a plurality of holding means and the holding means are guided along stretching paths at both longitudinal sides of the plastic film. In order to increase productivity, several plastic films are held, mutually spaced one on top of the other, by the holding means and are simultaneously stretched. The holding means, in terms of their number and/or design, are constructed and arranged such that several plastic films can be simultaneously stretched mutually spaced one on top of the other.

The invention relates to a ventilation module for a film stretching system at least one first outlet nozzle arrangement having an outlet nozzle, wherein the at least one outlet nozzle extends with its longitudinal direction transverse or perpendicular to the withdrawal direction of a plastic film web and is oriented in parallel to the transport plane. A first return system is provided with at least two extraction channels, each having an intake region. The at least two intake regions are spaced apart from one another in the withdrawal direction and oriented in parallel to the transport plane. The at least one outlet nozzle of the at least one first outlet nozzle arrangement is arranged between the first and the second intake region. The at least two intake regions are arranged exclusively before and/or after the at least one first outlet nozzle arrangement in the withdrawal direction of the plastic film web.

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).

Performance of a link apparatus is improved. A link mechanism (11C) included in the link apparatus includes, for example, a roller (110A) fixed to a link shaft (40A) via a bracket (100A), the roller (110A) being contactable with a link retainer (70).

A method of manufacturing a biaxially stretched film according by: (I) preheating a thermoplastic resin film to a temperature in a rubbery plateau region in a storage elastic modulus curve; (II) biaxially stretching the thermoplastic resin film under a condition that a stretching speed is 500%/min or higher while heating the thermoplastic resin film to the temperature in the rubbery plateau region; (III) cooling the thermoplastic resin film after the biaxially stretching (II) to a temperature in a glass-to-rubber transition region or a glass region in the storage elastic modulus curve; and (IV) relaxing the thermoplastic resin film after the cooling (III) at a temperature in the glass-to-rubber transition region.