Patent application number | Description | Published |
20090206510 | Method and Apparatus for Film Extrusion - A method and apparatus for extrusion of flat or tubular films from thermoplastic material is described. Improvements concern equalisation of the lateral distribution of the flow velocity achieved in combination with elimination in part or in full of die-lines formed at interfaces where part flows join each other. The improvement involves the provision of edges of the ends of die-walls which separate the part-flows from one another being slanted to form a lateral displacement over the length of said edge, or are provided with screw shaped vanes. | 08-20-2009 |
20090233041 | Crosslaminate of oriented films and methods and apparatus for manufacturing same - A crosslaminate is formed from two oriented plies of thermoplastic polymer material, arranged so that their orientation directions cross one another, the plies being heat sealed together. Each ply is semi-fibrillated, that is consist of linear thin regions of biaxially oriented material and thicker linear bosses between the thinner regions. The webs are sealed primarily through bonds formed at the intersection of the bosses (thicker regions). The array of bosses has a division less than 2 mm. The laminate has improved aesthetic and strength properties. A method for forming the crosslaminate involves segmental stretching of the material to form the thinner regions, and apparatus comprising intermeshing grooved stretching rollers having sharp-edged crests is described. | 09-17-2009 |
20100297401 | Method and apparatus for manufacturing a transversely oriented film of thermoplastic polymer material and products obtainable by the same method - A method of manufacturing an oriented film of thermoplastic polymer material comprises extrusion of a film in tubular form from an extrusion die, orienting the film in a main direction of orientation during the haul-off from the die while in molten or semi-molten state, the direction being at an angle between 0 and 45-to the axis of the tube, followed by cutting of the tube at an angle to its main degree of orientation to form a web having an orientation of no less than 20 to its longitudinal direction, which method involves segmental stretching of the film to form an array of linear bosses ( | 11-25-2010 |
20110210471 | METHOD AND APPARATUS FOR MANUFACTURE OF A POLYMER FILM, WHICH IS ORIENTED UNDER AN ANGLE TO ITS LONGITUDINAL DIRECTION - Flexible tubular film ( | 09-01-2011 |
20120040134 | Laminate of thermoplastic film materials exhibiting throughgoing porosity - A laminate of thermoplastic film materials exhibiting throughgoing porosity and comprising plies A and B, A having an inner surface A | 02-16-2012 |
20120126445 | METHOD FOR LONGITUDINAL STRETCHING A FILM IN SOLID STATE AND APPARATUS TO CARRY OUT THE METHOD - Method and apparatus for longitudinal orientation of thermoplastic film material ( | 05-24-2012 |
20120292819 | CROSSLAMINATE OF ORIENTED FILMS AND METHODS AND APPARATUS FOR MANUFACTURING SAME - A crosslaminate is formed from two oriented plies of thermoplastic polymer material, arranged so that their orientation directions cross one another, the plies being heat sealed together. Each ply is semi-fibrillated, that is consist of linear thin regions of biaxially oriented material and thicker linear bosses between the thinner regions. The webs are sealed primarily through bonds formed at the intersection of the bosses (thicker regions). The array of bosses has a division less than 2 mm. The laminate has improved aesthetic and strength properties. A method for forming the crosslaminate involves segmental stretching of the material to form the thinner regions, and apparatus comprising intermeshing grooved stretching rollers having sharp-edged crests is described. | 11-22-2012 |
20130017369 | GAS FILLED CROSSLAMINATE AND METHOD AND APPARATUS FOR ITS MANUFACTUREAANM Rasmussen; Ole-BendtAACI WalchwilAACO CHAAGP Rasmussen; Ole-Bendt Walchwil CH - Crosslaminates of thermoplastic films have at least one of the films formed as a fluted structure, and two films are laminated to one another in such a manner that pockets are formed which contain gas. The pockets allow passage of gas between at least two adjacent flutes, whereby the product has an improved handle, and bags formed of the laminate have good stacking properties when filled with coarse particulates. The flute pitch is generally no more than 3 mm, while the pocket length is less than 50 mm. The bonding method involves spot bonding between the films, achieved by adhering the films together between crown portions of bosses on one film with molten material on the other film under a low pressure process, for instance achieved by provision of air pressure through adaptation of production apparatus, for instance die portions. | 01-17-2013 |
20130055537 | METHOD AND APPARATUS FOR HELICAL CUTTING OF A TUBULAR FILM - A method of helically cutting a tubular film of thermoplastic material, in which a film in lay flat form, discharged from a reel, is brought to rotate around the middle axis of the film by means of rotating unwind devices, and while the rotating tube proceeds over the mandrel it is cut to non-tubular form by a knife, the position of which is fixed in relation to the surroundings, and the cut film is taken off from the mandrel, characterized in that the inflated film while being forwarded towards the mandrel or while it passes the upstream end of the mandrel, or both, is supported by driven support means placed around the outside of the tubular film, the movement of the support means being adapted to fit with the combined rotation and forwarding movement of the film. | 03-07-2013 |
20130181364 | METHOD AND APPARATUS FOR HELICAL CUTTING OF A TUBULAR FILM - A method of forming a film ( | 07-18-2013 |
20140138018 | METHODS FOR MAKING A FILM MATERIAL EXHIBITING TEXTILE PROPERTIES - A film material formed of thermoplastic polymer material is processed so as to have linearly extending regions (A) linked together by linearly extending webs (B), regions (A) and webs (B) each being oriented, the dominant direction of orientation in regions (A) forming an angle (V) to the direction on which (A) extends and webs (B) comprising arrays of linear furrows of thinner material or splits forming angles (U) higher than (V) to the direction in which (A) extends. The method of producing the new film involves passing an orientated film through a pair of intermeshing grooved rollers to cold-stretch the film in a direction at an angle to the predominant original orientation, at least one of the grooved rollers having crests with sharp edges to form the division between regions A and webs B and to stretch the material to form webs B while stretching the material less or not at all to form regions A. Preferably at least one of the grooved rollers has crests with a waved surface shape. | 05-22-2014 |
20140377397 | APPARATUS FOR MANUFACTURE OF A POLYMER FILM, WHICH IS ORIENTED UNDER AN ANGLE TO ITS LONGITUDINAL DIRECTION - Flexible tubular film ( | 12-25-2014 |