Krauss-maffei Aktiengesellschaft

Krauss-maffei Kunststofftechnik Gmbh

Kraussmaffei Technologies Gmbh

Evonik Rohm Gmbh

Thomson Licensing

Krauss-maffei Kunstsofftechnik Gmbh

Martin Eichlseder

Erwin Burkle

Arne Schmidt

Marc Poth

Erwin Buerkle

Ernst Ehrler

Edmund Theiss

Klaus Albrecht

Klaus Koralewski

Helmut Piringer

Sven Schroebel

Christian Eberle

Antonios Manis

Erwin Bürkle

Frank Gabriel

Götz Scheibe

The present invention relates to a process for producing coated mouldings with fully or partly structured surfaces. The present invention additionally describes a system for performing this process.

Process for producing coated molded bodies

The present invention relates to a process for the production of coated mouldings, by injecting a moulding composition into an injection mould and cooling the composition to obtain a moulding, and altering the injection mould in such a way as to produce an intermediate space between a surface to be coated of the moulding and the inner surface of the injection mould, and using injection moulding to charge a reactive mixture to the resultant intermediate space, where the temperature of at least a portion of the injection mould is increased for the curing of the reactive mixture. The present invention moreover describes a system for the conduct of the process described above.

Method for the production of coated moldings

The invention relates to a method for producing a plastic molded part () comprising an integrated conductor path (), which plastic molded part is used in particular as an intermediate product to be further processed into an electrically heatable mirror (). The method steps are: a) producing a substrate () from a carrier body () made of an electrically insulating plastic material having a conductor path () made of an electrically conductive material on or in a surface () of the carrier body (), b) flooding the surface () of the substrate () equipped with the conductor path () or the surface () of the substrate () opposite said surface with a liquid, electrically insulating coating material. The flooding evens out depressions due to uneven shrinkage in the thick and thin areas of the carrier body and a smooth surface can be produced, which can subsequently be covered with a reflective layer.

Method for producing plastic molded parts having an integrated conductive track

A device and a method are disclosed for producing an optical data medium, in particular high density optical media, such as the recently developed BlueRay&#x2122; disk for illumination with a blue laser (&#x3bb;&#x2248;405 nm). The required thickness of the data and/or protective layers is of the order of at most several tenths of millimeters. Such thin layers are difficult to produce with conventional injection molding processes. The disclosed device and method solve this problem by overflowing an element placed in a narrow cavity with a low-viscosity material having a viscosity lower than the viscosity of polycarbonate, which then forms the data or protective layer, or by bonding a layer produced in this manner to another layer using a low-viscosity adhesive.

Apparatus and method for producing optical data carriers

A mold portion of a molding tool for making plastic articles includes a base body defining a cavity surface and having formed therein at least one heating channel, and at least one cooling channel separated from the heating channel and having a cross section which is smaller than a cross section of the heating channel. The cooling channel is positioned hereby closer to the cavity surface than the heat channel and thus is in an area between the heat channel and the cavity surface, thereby defining a cavity-proximal cooling channel and a cavity-distal heat channel. Before the injection process, the cavity surface is heated by the heat channel to a higher temperature than the demolding temperature of the plastic article to be formed. At the end of the injection process, the cavity surface is cooled by the cooling system.

Molding tool, and method of making plastic articles

Molding tool having a heating and cooling medium

A metering device for an injection molding unit includes a base body having an antechamber in fluid communication with a feed channel for introduction of plastic material, and a metering chamber in fluid communication with a injection channel. The antechamber and the metering chamber are connectable with one another by a closeable passageway. Movably arranged in the base body between the antechamber and the metering chamber is a displacement member in the form of a piston to separate the antechamber and the metering chamber. The piston has a first end face which demarcates the antechamber and a second end face which demarcates the metering chamber, with the first end face defining an effective area which is smaller than an effective area of the second end face.

Metering device for an injection molding unit

The invention relates to a device for vacuum-pressing of disk-shaped substrates, in particular DVD substrates into a finished DVD, wherein the device has a vacuum chamber with two substrate holders and an intermediate element that can be displaced inside the vacuum chamber; and wherein the intermediate element divides the vacuum chamber into a first low-pressure chamber and a second chamber that can be alternatingly connected to vacuum or to an overpressure, which makes the device particularly suited for use with a hot-melt thermoplastic adhesive.

Device for vacuum-pressing of DVD substrates

A method for bonding two DVD halves ( ) which are so held at a distance as to form a gap therebetween, includes introducing into the gap an adhesive ( ) and spreading the adhesive across both disc halves. The invention is characterized by introducing the adhesive via a central opening of the DVD by means of e.g. L-shaped metering needles ( ) which are pivotally guided in a central pin that engages the central opening, or flexible plastic needles which are slidably guided in a guide tube. Through introduction of the adhesive via the central opening enables a flow to the outside, without interference from the metering needles, when the DVD halves ( ) rotate. There is no buildup of adhesive in front of the metering needle. The bonding process can be carried out without interruption of the application of adhesive until the spin-off has concluded.

Method and apparatus for bonding two halves of a DVD (digital Versatile disc)

Method for bonding two halves of a DVD (digital versatile disc)

An optical disk having a pair of axially oppositely directed faces and an annular outer periphery is made by first forming a mold cavity corresponding to the shape of the disk between a pair of axially spaced parts and a demolding ring sandwiched between the parts. The cavity is then filled with a hardenable resin such that the parts form the respective faces and an inner periphery of the ring forms the outer periphery of the disk and the resin is at least partially hardened in the cavity. The parts are then axially oppositely separated from each other and from the disk to leave the disk in the ring with both of its faces exposed and the ring is then transversely displaced with the disk engaged in it out from between the mold parts. The disk is then cooled and shrunk such that its outer periphery separates from the inner periphery of the ring and the disk separates from the ring.

Making a data-carrying optical disk

Apparatus for making a data-carrying optical disk

A sprue part is cut and removed from the injection mold part during the manufacture of information storage disks by an injection molding process. The highly sensitive molding of an information storage disk is protected from damage by the sprue and the deposition of dust particles during stripping by this process. The sprue is punched into a part serving as the die of the injection molding tool and subsequently removed, in particular by suction, through an orifice leading from inside the part, together with the dust particles generated in the punching process. Preferably, the sprue is punched out and removed with the injection molding tool closed. The injection molding tool must be opened only after the sprue and the dust have already been removed, thus ensuring that the molded product has an especially good quality.

Process for the punching and removing of the sprue in an injection

Apparatus for the punching and removing of the sprue in an injection

A check valve at the end of a plastifying worm for an extrusion or injection molding machine comprises a valve ring whose inner diameter is greater than that of a tip at the end of the head of the worm and which surrounds the neck connecting this tip with the valve seat of the worm. Spacers, preferably balls, are disposed between the ring and the tip and the surfaces of the ring and the tip flanking the balls are oriented to allow radial removal of the balls when the valve projects from the cylinder.

Growing community of inventors

Tettenweis, Germany

Martin Eichlseder