摘要:
Disclosed are interfacially modified particulate and polymer composite material for use in injection molding processes, such as metal injection molding and additive process such as 3D printing. The composite material is uniquely adapted for powder metallurgy processes. Improved products are provided under process conditions through surface modified powders that are produced by extrusion, injection molding, additive processes such as 3D printing, Press and Sinter, or rapid prototyping.
摘要:
It is an object of the present invention to obtain an optically transparent nano-dispersed polymer blend extrudate and a transparent resin having a microscopic dispersion structure in which incompatible polymer blend is melted and kneaded, one of resins is formed into a matrix, a size of dispersed phase of the other resin is controlled to 300 nm or less, more preferably 100 nm or less. Extra additive such as a compatibilizer is not added. When the incompatible polymer blend is melted and kneaded using a high shearing and forming apparatus having an inner feedback type screw under a condition that the screw rotation speed is 600 rpm to 3000 rpm, the rotation speed of the inner feedback type screw is increased, the kneading time is set under constant rotation speed, the high shearing forming condition is adjusted, and a structure in which a size of dispersed phase is controlled to 300 nm or less, more preferably 100 nm or less is formed.
摘要:
A tubular parison for forming a medical device balloon. The parison is formed of a polymeric material, for instance a thermoplastic elastomer. The parison has an elongation at break which is not more than 80% of the elongation of the bulk polymeric material. The elongation of the parison is controlled by altering extrusion conditions. Balloons prepared from the parisons provide higher wall strength and/or higher inflation durability than balloons prepared from conventional parisons of the same material.
摘要:
In the manufacturing of a semi-finished product made of elastomeric material, a method for controlling the heating of an extrusion device which includes multiple structural units having respective different working temperatures and thermal inertias includes; a) setting, for all of the above-mentioned units a heating temperature to a value equal or close to the working temperature of the unit which has the lowest working temperature; b) simultaneously heating all of the above-mentioned units; c) when said unit is approaching or has reached the heating temperature, setting for the other units a new heating temperature to a value equal or close to that of the working temperature of the unit, the working temperature of which is closest to the heating temperature; and d) iteratively repeating the operations mentioned in b) and c), until all of the above-mentioned units have reached the respective working temperature.
摘要:
The present invention relates to a microcellular foam of a thermoplastic resin and a method for preparing the same, and more particularly to a microcellular foam comprising a skin layer having a porosity of below 5% and a core layer having a porosity of at least 5%, wherein the thickness of the skin layer accounts for 5 to 50% of the entire foam, and a method for preparing the same. The microcellular foam of the present invention is advantageous in that it has a thicker skin layer and smaller and uniform micropores in the core layer, compared with conventional microcellular foams, while having mechanical properties comparable to those of conventional non-foamed sheets.
摘要:
Extrusion die (30) comprising a plurality of shims (40a, 40b, 40c) positioned adjacent to one another, the shims (40a, 40b, 40c) together defining a first cavity, a second cavity, and a die slot, and methods of using the same. A variety of composite layers can be made from various dies described herein.
摘要:
It is an object of the present invention to obtain an optically transparent nano-dispersion polymer blend extrudate and a transparent resin having a microscopic dispersion structure in which incompatible polymer blend is melted and kneaded, one of resins is formed into a matrix, a size of dispersed phase of the other resin is controlled to 300 nm or less, more preferably 100 nm or less. Extra additive such as a compatibilizer is not added. When the incompatible polymer blend is melted and kneaded using a high shearing and forming apparatus having an inner feedback type screw under a condition that the screw rotation speed is 600 rpm to 3000 rpm, the rotation speed of the inner feedback type screw is increased, the kneading time is set under constant rotation speed, the high shearing forming condition is adjusted, and a structure in which a size of dispersed phase is controlled to 300 nm or less, more preferably 100 nm or less is formed.
摘要:
A temperature gradient controller device in parts of machines for processing plastic materials comprises heating means to be operatively activated on at least one part of a machine; this heating means comprises vector means adapted to transfer a predetermined amount of heat to said part of said machine by remote radiation.
摘要:
The invention describes a blow head (1, 21, 208) for production of a multilayer blown film (18) with at least two plastic layers, which (1, 21, 208) has at least the following melt guiding areas (16, 17, 25, 205), which are traversed in succession in the direction of flow (z) of the melt: feed lines (25, 205) to the at least two individual gaps for guiding an individual stream at least two individual gaps (16) for guiding of an individual stream an annular gap (17) for combining of the film composite (18). At least one thermocouple (85, 142) is arranged on at least one flow path of at least one individual stream before it reaches the annular gap (17).
摘要:
UHMWPE panels of large width may be ram extruded from a slit die in a stable process, by restraining a panel which exits the die below the crystalline melt temperature against movement away from the die by a back pressure device, so as to exert a back pressure between the back pressure device and the die, the back pressure device preferably constructed of a plurality of differentially adjustable elements so as to be able to compensate for changes in processing characteristics over time. Vertically restraining UHMWPE panels as they further cool also greatly improves product characteristics.