7 results about "Die swell" patented technology

Compositions that blend a first polyethylene (PE) component that is one or more high density PE and a second polyethylene component are provided. The blends demonstrate improved ESCR performance and stiffness relative to currently available caps and closures used in carbonated soft drinks products. The blend also has a suitable die swell for compression molding.

The invention relates to a continuous extruder for producing a plastic hollow plate, and belongs to the technical field of high polymer material processing. Comprising a main feeding system, a high-shear double-screw extruder, an integrated melt regulation and control system, a dynamic adjustable flow dividing and distributing mechanism, a forming die head and a heat-flow synergistic shaping unit which are connected in sequence, as well as a central control unit and a flow dividing valve group. The dispersion uniformity of the melt is improved through ultrasonic-assisted re-homogenization and magneto-rheological shear enhanced mixing, and the rheological consistency is controlled through dynamic temperature compensation of melt viscoelasticity feedback; according to a product specification instruction, the central control unit drives the diverter valve group to realize melt distribution as required; and after extrusion, mold release expansion and surface temperature are monitored in real time. According to the invention, the melt mixing uniformity is obviously improved, the product switching time is shortened, the wall thickness variation coefficient is reduced, and the production efficiency and the product quality are effectively improved.

The application discloses a kind of high-strength HDPE drainage pipe production methods, belong to HDPE water pipe production technical field, mainly including raw material preparation, raw material pretreatment, extrusion molding, cooling and shaping and stretching and cutting etc. Step, just extruded waste and traction pipe sealing adhesion, new material is affected by traction mechanism and enters into the shaping device from extruder, mainly through the way of vacuum suction and air pressure expansion to ensure that the size and shape of pipe material meet the design requirements, the traction speed of traction device is 1%-10% higher than the speed of extruder, to overcome the die swell of pipe material, secondly, the traction speed of traction device is adjustable slow speed affected by the stretching of pipe material in shaping device, effectively reduce the problem that pipe wall is thinned due to pipe material is pulled up too fast in shaping device, to improve the mechanical properties and longitudinal dimension stability of product.

Compositions that blend a first polyethylene (PE) component that is one or more high density PE and a second polyethylene component are provided. The blends demonstrate improved ESCR performance and stiffness relative to currently available caps and closures used in carbonated soft drinks products. The blend also has a suitable die swell for compression molding.

A novel shut-off nozzle for injection molding systems is disclosed herein for producing and injecting foamed polymers to form products and other parts. The shut-off nozzle is designed to increase cell nucleation during the foaming process, increase the rate of pressure drop as the polymer is injected into the mold, and stop the die swell of the foamed polymer at the end of the injection cycle. The shut-off nozzle includes an angled shut-off needle, which significantly reduces the amount of waste per injection cycle, and a water-cooled circuit for rapidly cooling and solidifying the molten polymer remaining in the shut-off nozzle at the end of each injection cycle.

To provide a thermoplastic resin composition having a relatively small die swell ratio in extrusion molding, and to provide a molded article.SOLUTION: The content of the phthalic acid ester (C) is 5ppm or more and 10, 000ppm or less with respect to 100 parts by mass of the ethylene / α - olefin / non-conjugated diene copolymers (A).SELECTED DRAWING: None

The application discloses a recycled polypropylene composite material with high surface smoothness and high paint adhesion and a preparation method thereof, which comprises the following raw materials in percentage by weight: recycled polypropylene resin 46-75, high-performance composite master batch 15-30, elastomer 10-20, antioxidant 0.2-1, and other additives 0.2-3. The application adopts a high-performance composite master batch to replace the traditional method of directly using talcum powder and additives, fully utilizes the die swell effect of polymers, and in the double-screw extrusion or injection molding process, the polypropylene with super high melt flow rate flows to the outside of the melt, drives the modified chlorinated polypropylene and epoxy resin to uniformly disperse and enrich in the material surface layer, so that the surface polarity of the recycled polypropylene composite system is greatly improved. Meanwhile, by using the interlayer gap characteristics of the regular layered structure of the high-aspect-ratio talcum powder in the high-performance composite master batch, the paint components with small volume molecules are further adsorbed, so that the adhesion between the recycled polypropylene base material and the paint is further improved.