摘要:
A multilayer polyolefin foamed sheet comprises a foamed layer and a non-foamed layer. The foamed layer is composed of polyolefin and the non-foamed layer is composed of one of the polyolefins, a polypropylene with a long-chain branch and a polyolefin-based adhesive resin with a long-chain branch. In another aspect, a multilayer polyolefin foamed sheet comprises a foamed sheet having at least one polyolefin foamed layer and a gas barrier resin sheet having at least one barrier resin layer laminated thereon, wherein the gas barrier resin sheet has a thickness of from 10 to 300 nullm and has a thickness distribution, Tmax/Tmin, of from 1 to 1.2 in an area of at least 25 cm2.
摘要:
An annular co-extrusion die for extruding multi-layer tubular plastic film has inner die mandrels stacked one upon another. Each die mandrel has a generally U-shaped cross-section with side walls extending substantially in parallel with the longitudinal axis of the die. The outer surfaces of the die side walls each have a series of helical shaped grooves formed therein. An annular outer die member surrounds the first inner die mandrel and the inner surface of the outer member and the outer surface of the first inner die mandrel form a longitudinally extending annular extrusion passage. Additional longitudinally extending annular extrusion passages are formed between outer and inner surfaces of nesting inner die mandrels.
摘要:
An extrusion molding die is provided which produces a tube that contains a portion in which the cross-sectional area ratio of an inner layer and outer layer in axial cross-section continuously varies, wherein said cross-sectional area ratio can be changed in a short time. The extrusion molding die 50 moves a second inner layer mandrel 54 in the axial direction and changes the flow passage volume of an inner layer resin flow passage 62a in accordance with changes in supply quantity of an inner layer forming resin.
摘要:
An extruder head has inner, middle, and outer annular outlets centered on a common axis and immediately adjacent one another, a flow splitter on the axis, first and second inlets axially upstream in an axial flow direction of the splitter, and a third inlet between the splitter and the outlets. A tubular inner passage centered on the axis extends in the direction from the first inlet around the splitter to the outer outlet and a tubular middle passage centered on the axis extends axially in the direction from the second inlet around the splitter to the middle outlet. An outer passage having an upstream portion axially downstream of the splitter extends transversely of the axis. A tubular downstream portion also axially downstream of the splitter extends coaxially around the inner and middle passages from the upstream portion to the outer outlet.
摘要:
The invention relates to an extrusion storage head (10) for a blow-molding machine and a method for production of blow-molded multi-layer plastic hollow bodies made from a two- or multi-layer pre-form, whereby two or more peripheral manifolds (16, 18) are arranged above a storage reservoir (20), from which the peripherally-extruded plastic may be sequentially ejected as a tubular parison from a controlled annular nozzle (24) by means of an ejector piston (22). According to the invention, an additional peripheral manifold (26) is arranged between the storage chamber (20) and the controlled annular nozzle (24) for application of a further plastic layer (outer functional layer) on the previously peripherally extruded plastic carrier. The additional peripheral manifold (26) is connected through a supply line (28) to an additional external storage element (30) for the molten plastic of the functional layer, wherein the additional external storage element (30) has a separate extruder (32).
摘要:
A blade member manufacturing process using no mold and a developer quantity control blade manufacturing process using this blade member are disclosed in which a material for the blade member is extruded onto a charge control face face-transferring sheet in a uniform thickness, and solidified to form a layer, and the layer is cut into the shape of a blade member.
摘要:
A method and apparatus are described for coextruding two materials A and B, in which B is extruded on A through a port (3), in which the separating wall between the flows of A and B is formed as a flap closure (4) adapted to act as a non-return valve for the flow of B into A, and further means are provided for extruding B through the port in pulses. The pulses may be effected by opening and closing the closure, by mechanical transmission means or by the effect of imposing pressure difference on the flap (4) by the flows of A and/or B. The pulsing means preferably involves rams (1). The invention is particularly suitable for extruding a low viscosity material B onto a higher viscosity material A, or for making sheets or pipes with alternating segments of differential flexibility, or for coextruding a flow of solid particles with a flow of liquid.
摘要:
The present disclosure generally relates to extrusion die systems. In particular, the present disclosure relates to the cyclical extrusion of materials to generate small sized grain features, generally in the range of nanosized grain features, in a tubular or profile shape, in which the individual nanolayers possess pores and/or polymer crystals oriented parallel to the extrusion flow direction and including products with enhanced permeation properties.
摘要:
Hybrid articles comprising a molded mixture of a light metal alloy and a polymer are formed by processing (including co-molding and co-extruding) the metal in a semi-solid state at a high shear rate and the polymer in a melt processable state. For example, magnesium alloy particles in a thixotropic condition are mixed with particles or globules of the polymer and molded into a hybrid metal-containing and polymer-containing body. The proportions of magnesium and polymer may be varied substantially depending on the desired properties of the hybrid article. In another embodiment the light metal and polymer may be co-extruded as two or more distinct layers into a solid or hollow hybrid body.
摘要:
The invention relates to spiral distributors on axial or conical spiral blow heads.The invention has discovered that when the circumference of a spiral flock in a spiral mandrel slot increases, it can be advantageous if the height of the spirals can be limited in such a manner that a similar surface covered with spirals is created in the twisted mandrel slots. The invention calls this surface “active surface”.A plurality of aspects of the invention, which specify different rules regarding how to implement the basic observation, are presented.