Abstract:
Disclosed is a method for continuously producing an acrylic resin sheet containing 50% by mass or more of methyl methacrylate units, which comprises irradiating an active energy ray-polymerizable viscous liquid 2 which contains a polymer, satisfies the following equations (1) and (2), and has a viscosity of 5,000 Pa·s or more with the active energy ray to cure the liquid while transferring the liquid in the state of being held between an endless belt 3 and a film 5 transmissive to the active energy ray or between first and second films transmissive to the active energy ray, 30,000≦Mw≦500,000 (1) 35−(9/200,000)×Mw≦P≦60 (2) wherein, in these equations, Mw represents a weight average molecular weight [−] of the polymer contained in the liquid, and P represents a content [% by mass] of the polymer contained in the liquid.
Abstract:
A microreplicated article is disclosed. The article includes an opaque web having first and second opposed surfaces. The first surface includes a first microreplicated structure having a plurality of first features. The second surface includes a second microreplicated structure having a plurality of second features. The first microreplicated structure and the second microreplicated structure retain registration within 100 micrometers.
Abstract:
The invention relates to an arrangement for inductively heating an electrical conductor after the extrusion head in a process of manufacturing electrical cables (8) having insulation layer on the electrical conductor. The arrangement comprises a first distinctive part having induction means (5), and a second distinctive part having guide means (4) and provided in a splice box (3) for directing the magnetic field created with the induction means (5) to protect external parts from heating.
Abstract:
Process for manufacturing a composite block of closed geometry, in the form of a continuous ring, based on reinforcing fibres and on a cross-linkable resin, by continuously winding in superposition a predetermined number Nc of layers of a tape of the reinforcing fibres embedded in a matrix based on a composition comprising the cross-linkable resin, the method comprising, from the upstream end downstream, the steps of: producing a rectilinear arrangement (12) of reinforcing fibres (11), and conveying this arrangement in a feed direction (F); degassing the arrangement of fibres (12) under the action of a vacuum (13); after degassing, impregnating the arrangement of fibres (12) with the resin composition in the liquid state (17); passing the pre-preg thus obtained through a die (20) to impose on the per-preg the shape of a tape (21) consisting of the reinforcing fibres (11) in their liquid resin matrix (17), the thickness (Er) of the tape being between 0.1 mm and 0.5 mm; on leaving the die (20), applying a surface treatment (22) to the upper face of the tape (21) in order to create a solid skin the thickness (Ep) of which represents less than 10% of the thickness (Er) of the tape, so that the skin acts as a stable base for the subsequent winding of the tape (21) on itself; depositing the thus superficially treated tape (21) on a support (23) that dictates the final shape of the composite block, and winding the tape (21) onto the support (23), in a single direction, by superposing the number Nc of layers in order directly to form the continuous ring (30) on the support (23), Nc being less than 15.
Abstract:
A process produces a conductive rubber roller having small aspect ratios of inner and outer diameters, having a stable measure of its inner diameter, having uniform cell distribution and being free from non uniformity of hardness and electrical resistance in the peripheral direction. The process has a step of continuously extruding a tube composed of a specific unvulcanized rubber composition from a rubber extruder in a microwave vulcanizing unit, and a step of foaming and vulcanizing the tube by using a microwave irradiator having a microwave irradiation zone 4 m or less in length while being transported at given speed. The foamed rubber tube has an inner diameter 20 to 35% smaller than the outer diameter of the conductive core material over the whole region in the lengthwise direction, and the conductive core material is press fitted into the foamed rubber tube without using any adhesive.
Abstract:
The present invention provides a method and apparatus for curing a coated fiber, comprising either two fiber coating curing stages separated by a cooling stage, or two fiber coating curing stages separated by a distinct time interval, or both. One of the two fiber coating curing stages responds to the coated fiber, and provides a partially cured fiber coating. The other of the two fiber coating curing stages responds to the partially cured coated fiber for further curing the coating of the fiber. In one embodiment of the invention, a cooling stage is placed between the two curing stages, while in the other the curing stages are placed a set distance apart such that polymerization of the coating initiated by the first curing stage has time to complete prior to the coating being irradiated by the second curing stage. The cooling stage is used to actively remove heat generated during the cure process from the fiber coating, while the time delay is used to allow complete polymerization to occur before subsequent irradiations. These embodiments of the present invention can be used separately or in combination to achieve optimal fiber coating cure.
Abstract:
A method of producing a screen for forming a nonwoven material by hydroentanglement. The method includes the steps of providing a layer of radiation curable polymeric resin material in fluid form. Further, the step of irradiating at least one layer of radiation curable polymeric resin material in fluid form through at least one mask selectively transparent to the radiation, so as to effect at least partial curing of the material of the at least one layer in positions corresponding with radiation-transparent regions of the mask. Further still, the step of removing uncured polymeric material to form one or more apertures within the at least one layer. Wherein the radiation-transparent regions of the mask have different sizes and shapes and are distributed randomly, such that the one or more apertures provided in the cured polymeric material of the screen are not provided in a regular pattern or form.
Abstract:
The invention relates to a process for the production of a polymer layer of a flexible unbonded offshore pipe. The process comprises the steps of shaping a polymer material by extrusion into or onto a supporting unit in an extrusion station and cross-linking said extruded polymer material, said polymer material comprising a polyethylene and a peroxide for providing a cross-linking of the polymer material. The peroxide has an activation temperature substantially above the temperature of the polymer material during the extrusion thereof. The cross-linking of the extruded polymer material is carried out by exposing the extruded polymer material to electromagnetic waves, selected from the group consisting of infrared radiation and microwave. The invention also relates to a flexible unbonded offshore pipe comprising such polymer layer.
Abstract:
A method for manufacturing a fuel hose which can efficiently produce heat-resistant and flexible fuel hoses. The method for manufacturing a fuel hose forms a protector layer on an outer peripheral surface of a resinous inner layer, and includes the steps of extruding an ultraviolet crosslinking composition for a protector layer that contains the following components A to D, on the outer peripheral surface of the resinous inner layer; and subsequently, irradiating ultraviolet rays to polymerize the ultraviolet crosslinking composition, thus forming the protector layer: (A) ethylene-propylene-diene rubber; (B) acrylate-based monomer; (C) silica; and (D) photopolymerization initiator.
Abstract:
Process for the production of pressure sensitive adhesive materials or sealing materials having a defined cross-sectional geometry and three-dimensional structure, especially in the form of rolled or continuous materials, which comprises the following steps: (a) preparing a polymerizable mass (5); (b) applying this mass to an abhesive support (1, 2, 3, 6) in web form which, in longitudinal direction, has one or more depressions (30) having a predetermined cross-sectional contour, or filling said mass into one or more contour-imparting, abhesive hollow bodies (11) which have a predetermined cross-sectional contour; (c) feeding the mass to a curing unit (7) for curing the polymerizable mass (5).