Abstract:
This invention relates to a machine for bonding up to three films, possibly made of different materials, characterised in that it comprises: a first unit designed to pay out a first film associated with a spreader/applicator unit to apply a layer of adhesive to one surface of said film. a second unit designed to pay out a second film associated with a spreader/applicator unit to apply a layer of adhesive to one surface of said film. a third unit designed to pay out a third film. 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 is the action of hydraulic actuators, the two bonding units being positioned between the two pay-out/applicator units.
Abstract:
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.
Abstract:
Disclosed herein is a method for glueing corrugated board and an apparatus for carrying out the same, the method comprising: heating a starch glue to a predetermined temperature range by heat exchange; supplying the starch glue to a glue pan placed in a hot atmosphere of a heat-insulated space so as to maintain the glue in a heated state; feeding a corrugated core sheet and a liner into the heat-insulated space; applying the heated starch glue to ridge portions of the corrugated core sheet; and bonding together the corrugated core sheet and liner.
Abstract:
Disclosed is an improved method of producing corrugated cardboards, in which water suspension of raw starch is used as an adhesive. The raw starch is, after application thereof, heated to form gell or paste with dry steam prepared by reheating low-pressure steam with high-pressure steam. Also, disclosed is an apparatus for practicing the improved method.
Abstract:
In the manufacture of a multi-ply fibrous web structure, each of a pair of plies of fibrous web material is provided with a pattern of relatively deep, primary, spot embossments each adherent to the opposite ply and surrounded by a pattern of relatively shallow, secondary, non-adherent spot embossments.
Abstract:
Method of and apparatus for producing honeycomb paneling comprising the steps of supplying two continuous webs of felted fibrous material, continuously impregnating each web with a liquid resin, continuously applying the webs to the two major faces of a rigid pre-formed honeycomb core having cells extending through its thickness, applying depthwise pressure to the laminated assembly to cause the cell edges to be embedded in the thickness of each web to produce substantial fillets between the webs and cells, and curing the webs in situ to form rigid bonded panel facings of fiber reinforced plastic, and means to carry out the above method steps.
Abstract:
A method and apparatus for producing a sheet molding composite are provided. The sheet molding composite consists of two outer sheets of plastic material between which is sandwiched a moldable material or compound containing fiber-reinforced resin. The resin-containing material is maintained in a deformable, flexible state until it is placed in a mold and subjected to heat, at which time it is cured in the shape of the final molded product. The molding composite is made by depositing a layer of a preblended resin-containing material on the upper surface of one of the sheets of plastic material and by then depositing a layer of randomly disposed glass fibers onto this first layer. A second layer of pre-blended resin-containing material from the same source is also deposited on an upper surface of a second of the plastic sheets. The latter sheet is then turned over and moved into parallel relationship with respect to the first sheet and with the second layer of resin-containing material moved into contact with the reinforcing fibers on the first layer of resincontaining material. The composite is then kneaded to thoroughly mix the fibers and resin-containing material and at least one of the plastic sheets and material therebelow is punctured by needles to remove air through the resulting passages. The resin can then be partially cured and the partially cured composite wound on a reel where it can be stored until molded. To obtain uniformity throughout the composite, the layers of resincontaining material deposited on the sheets must be uniform. Heretofore, this has required very careful blending of the materials for each of the sheets and very careful mixing thereof by kneading, when in the composite. In accordance with the invention, the layers of resin-containing material for the two outer sheets are supplied from the same source so that identical compositions are achieved for those layers. The blending and mixing steps are thus simplified or shortened by this arrangement with uniformity still being assured.
Abstract:
AN APPARATUS FOR PRODUCING A LAMINATED PRODUCT OF EITHER TWO OR THREE WEBS IN WHICH MEANS IS PROVIDED FOR IMPARTING A PREDETERMINED UNIFORM LONGITUDINAL TENSION IN SAID WEB AND FOR FEEDING THE TENSIONED WEB TO AN ADHESIVE APPLYING MEANS BY A TENTER CONVEYOR CAPABLE OF
TRANSVERSELY ALIGNING THE WEB AND BY A CONVEYOR HAVING A HIGH FRICTION SURFACE FOR MAINTAINING THE WEB IN TENSIONED TRANSVERSELY ALIGNED CONDITION.