摘要:
Es wird ein Verfahren beschrieben zum Prägen und/oder Umformen von Flächengebilden auf der Basis von vernetztem Polyolefinschaum. Zunächst wird ein flächiger Abschnitt aus vernetztem Polyolefinschaum wenigstens auf einer Seite mit einem Fasermaterial wie Vlies oder Textil oder mit einer Folie zu einem mehrlagigen Flächengebilde kaschiert, wobei das Fasermaterial oder die Folie aus einem im Wesentlichen polaren thermoplastischen Kunststoff besteht. Das kaschierte Flächengebilde wird in einer unbeheizten Form zonenweise verpresst und dabei einer Hochfrequenzstrahlung ausgesetzt, wobei das mehrlagige Flächengebilde bleibend geprägt und/oder umgeformt wird. Anschließend wird das mehrlagige Flächengebilde der Form entnommen.
摘要:
An improved energy absorbing member comprising, an thermoplastic cellular polymer in contact with a structural element such as a metal guard rail or automotive door, wherein the cellular polymer has an average cell size of at least about 0.75 mm and at least one of CE/CT, CV/CT and CH/CT is about 0.25 to about 0.4 said one of CE/CT, Cv/Cτ and CH/CT having a compressive efficiency of at least 70% at a 60% strain, CE, Cv and CH being the compressive strength of the cellular polymer in each of three orthogonal directions E, V and H where one of these directions is the direction of maximum compressive strength in the foam and Cx equals the sum of CE, Cv and CH.
摘要:
The current invention discloses a process comprising compacting a composition comprising virgin ultrahigh molecular weight polyethylene (UHMW PE), said UHMW PE having a weight average molecular weight of at least 1,000,000 g/mol, to provide a compacted composition comprising virgin UHMW PE, sintering said compacted composition, and crosslinking said UHMW PE.
摘要:
A method of making porous metal foam structures includes the steps of combining a liquid-extractable, pore-forming agent with a metal powder in the presence of a liquid in which the pore-forming agent is soluble, thereby forming a mixture, compacting the mixture to form a green body, and dissolving the pore-forming agent from the green body to produce a metal skeleton.
摘要:
The present invention is a process for producing molded parts (1) from a polymeric powder or metallic powder, wherein the molded part has a separation or a void (5,10). The separation or void is formed by inserting a separator or void-forming material into the die cavity before, during or after filling the die cavity with the powdered molding material that is to form the pressed part. After the pressed part is formed the separator or void-forming material is removed to provide the separation or void.
摘要:
A chip (20) or other electrical component is embedded in a substrate (32). The substrate (32) may be a thermoplastic material capable of deforming around the chip and at least partially encasing the chip. Electromagnetic radiation such a near infrared radiation can be used to heat the substrate. The substrate may include a compressible layer that can be compressed and/or crushed to form a recess into which the chip can be inserted. Once embedded, the chip or electrical component is secured by the substrate and may be coupled to another electrical component. An RFID chip is embedded in a substrate using heat and/or pressure, an antenna structure (52) is applied to the substrate (32), and the RFID chip (20) and antenna structure (52) are coupled together.
摘要:
This invention relates to melt-processible poly(tetrafluoroethylene) (PTFE), compositions thereof, articles formed therefrom, and methods for making the same. More particularly, the present invention relates to a particular range of poly(tetrafluoroethylene) polymer which are readily melt-processible while maintaining good mechanical properties. Further, the present invention relates to products made of melt-processible, thermoplastic PTFE compositions.
摘要:
Composite worm gears having little residual stress are prepared by forming a tube (101) of synthetic resin by extrusion, compression molding, or centrifugal processing, and fixing the tube thus produced or rings (102) cut therefrom onto a boss (103) or core (105), preferably of metal. The process allows high performance high molecular weight thermoplastics to be employed.