Method and device for producing a polymer tape
OwnerReinard Jozef Maria Steemaninventor
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for producing a highly oriented, high molecular weight polymer tape. The method comprises: a) forming a non-fibrous polymeric sheet; (30) b) rolling and stretching said sheet (30) to form a partially oriented polymer web; (31) c) drawing the partially oriented polymer web (31) to form an oriented non-fibrous polymer tape (33), the method is discontinuous in that the ingoing line speed of at least one method step differs from the outgoing line speed of the preceding method step. The invention also relates to a device for carrying out the method. The invention further relates to a material sheet comprising the polymer tapes. A ballistic resistant article comprising the material sheet exhibits excellent antiballistic properties.
Claims15
A method for producing an oriented non-fibrous polymer tape, the method comprising a) forming a non-fibrous polymeric sheet;
- b) rolling and stretching said sheet to form a partially oriented polymer web;
- c) drawing the partially oriented polymer web to form an oriented non-fibrous polymer tape, characterised in that the method is discontinuous in that the ingoing line speed of at least one method step, in particular the ingoing line speed of the method steps b) or c), differs from the outgoing line speed of the preceding method step.
A device for producing an oriented or a highly oriented non-fibrous, polymer tape, wherein the polymer comprised by said tape is preferably a high molecular weight polymer, the device comprising:
- a) a forming unit having an upper and lower rotating belt, between which particles of polymer, preferably a high molecular weight polyolefin and most preferably a solid state drawable polyethylene, can be fed, and a compressing unit for compressing the particles to form a non-fibrous polymer sheet;
- b) a calendar unit and heater for rolling and stretching the sheet and forming at least a partially oriented polymer web;
- optionally a second calander unit and heating means for further rolling and stretching the sheet and forming a more oriented polymer web
- c) a drawing unit and heater for drawing the at least partially oriented polymer web and form a more oriented non-fibrous polymer tape;
- and
- d) at least one additional drawing unit and heater,
- whereby the device is provided with at least one take-up and/or feed station between at least two of the units a) to d) and optionally a third and more subsequent drawing units.
Dependencies are inferred from the claim text.