摘要:
An adhesive-spreading unit includes a set of rollers, each of which rotates at a higher speed than the preceding one, the first roller being in contact with a tank of adhesive and the last roller sliding in contact with a film on which the adhesive is to be deposited. The unit also includes devices for distancing the rollers from one another and bring them into contact when the film has been loaded into a machine, and a single actuator unit for moving the rollers. The actuator, during the first stage of its travel, brings a rubber-clad roller into contact with the first roller, and during the second part of its travel moves the two rollers to bring the rubber-covered roller into contact with a third roller, which transfers the adhesive to the film and vice versa.
摘要:
A drying system of a coated continuous film equipped with roller conveyor devices of the continuous film that allow easy and rapid removal of the rollers from the system to facilitate cleaning and maintenance operations. The conveyor roller is substantially separable into two parts with at least one of the two support shafts separable from the rest of the roller to facilitate the disassembly and reassembly operations of the conveyor roller from and on the system. In this way, it is unnecessary to remove all the motion transmission elements connected to one of the two support shafts.
摘要:
Method for bonding together up to three layers in a film, which may be made of layers of different materials. The method includes unwinding from pay-off units layers of the film and guiding them into a spreader/applicator units designed to apply an adhesive material to one side of the layers and feeding them to a bonding zone (1), bonding together the layers in the bonding zone, by winding them over a first bonding calender (18), along a contact arc on the surface of said calender. The method is characterized by determining the breadth of said contact arc by rotating a nip onto which the presser roller (19) is mounted, so as to vary the position of the point of contact between a presser roller (19) and the surface of said bonding calender (18). The bonded film is then taken up.
摘要:
Disclosed is a plant for continuously drying a coated film including a cavity (3) with a first open end (3a) through which a film (F) enters and a second open end (3b) through which the dried film exits, a plurality of rollers (7) for supporting the film inside the cavity (3), a feed and extraction system (10) adapted to feed a flow of air to a first blowing element (9), adapted to direct a flow of air onto the surface of the coated film (F), and to extract a flow of air from the cavity (3) through a suction element (27, 28), characterized in that it includes a second blowing element (11) fed by the feed and extraction system (10), adapted to direct a flow of heated air onto the opposite surface of the film.
摘要:
This invention relates to a machine for bonding up to three film comprising: a first unit designed to unwind a first film associated with a spreader/applicator unit to apply an adhesive material to one surface of said film; a second unit designed to unwind a second film associated with a spreader/applicator unit to apply an adhesive material to one surface of said film; a third unit designed to unwind a third film; and a fourth unit comprising two bonding machines designed to join the various layers of film together. Said bonding units comprise a bonding calender, onto which the various layers of film are wound, and at least one presser roller which is subject to the action of hydraulic actuators, the two bonding units being positioned between the two pay-off/applicator units.The present invention also relates to a method for bonding three films composed of materials which can be of a nature similar to and/or different from one another, using the same bonding unit.
摘要:
An adhesive take-up, metering and spreading unit, for bonding machines is truck-mounted so that it can be replaced without having to interrupt the operation of the plant, includes a plurality of rollers arranged in series, wherein a first rubber-clad roller takes up adhesive from a reservoir and transfers it to an anilox roller, from which the adhesive is taken up by a second rubber-clad roller, which transfers it to a film to be bonded. Each roller rotates at a higher speed than the preceding one, and the unit is fitted with members that regulate the distance between the rollers, and consequently the pressure that each rubber-clad roller exerts on the anilox roller, in order to meter the precise quantity of adhesive taken up and spread on the film. This characteristic allows even special adhesives, whose application is particularly difficult due to their viscosity characteristics, to be precisely spread and metered.
摘要:
A machine for bonding layers in a film includes first pay-off unit to unwind a first layer of the film, a second pay-off unit to unwind a second layer of the film, a third pay-off unit to unwind a third layer of the film, a bonding zone to join the various layers of film together, and a winding unit including a reel onto which the bonded film is wound, the bonding zone including at least one bonding unit, the pressing roller being fitted with at least an hydraulic actuator which brings it in contact with the layers of film on the bonding calender, the presser roller and the hydraulic actuator being mounted on a nip rotating around the axis of the bonding calendar so as to vary the position of the point of contact between the presser roller and the calender and hence to vary the breadth of the contact arc, along the surface of the calender, in which the layers are overlapped.
摘要:
Disclosed is a plant for continuously drying a coated film including a cavity (3) with a first open end (3a) through which a film (F) enters and a second open end (3b) through which the dried film exits, a plurality of rollers (7) for supporting the film inside the cavity (3), a feed and extraction system (10) adapted to feed a flow of air to a first blowing element (9), adapted to direct a flow of air onto the surface of the coated film (F), and to extract a flow of air from the cavity (3) through a suction element (27, 28), characterised in that it includes a second blowing element (11) fed by the feed and extraction system (10), adapted to direct a flow of heated air onto the opposite surface of the film.
摘要:
An adhesive-spreading unit includes a set of rollers, each of which rotates at a higher speed than the preceding one, the first roller being in contact with a tank of adhesive and the last roller sliding in contact with a film on which the adhesive is to be deposited. The unit also includes devices for distancing the rollers from one another and bring them into contact when the film has been loaded into a machine, and a single actuator unit for moving the rollers. The actuator, during the first stage of its travel, brings a rubber-clad roller into contact with the first roller, and during the second part of its travel moves the two rollers to bring the rubber-covered roller into contact with a third roller, which transfers the adhesive to the film and vice versa.
摘要:
A machine designed to bond a number of layers of film made of different materials, using solventless adhesive, to obtain a single multi-ply film consisting of a series of layers having different characteristics, which comprises a drum (2) associated with a plurality of spreader/applicator units (3, 4, 5), each of which comprises a tank of adhesive and means for taking up said adhesive and transferring it in the form of a thin layer to an applicator roller which moves in contact with the drum. Each of the films to be bonded is fed to one of the zones formed between the drum (2) and said spreader/applicator units (3, 4, 5), where it receives a layer of adhesive and is then joined to the film fed to the next zone. The machine can be set up to produce a single film consisting of different layers, and also to make two films each consisting of two layers bonded to one another, or a three-ply film wherein the films can be made of different materials.