11 results about "Die swell" patented technology

The invention provides a polyolefin melt extrusion method based on internal source gas-assisted lubrication and a fluoride-free processing aid for realizing the method, and belongs to the technical field of plastic molding processing. According to the invention, during polyolefin melt extrusion processing molding, gas is introduced into a polyolefin melt in situ and is dissolved in the polyolefin melt under the action of pressure provided by equipment, and melt flow is assisted through plasticization and other mechanisms; gas dissolved in the tail section of melt extrusion processing equipment and a molding die area is instantly released and diffused between a melt and the inner surface of the equipment, so that the melt flow is efficiently assisted, the melt fracture is slowed down, the die expansion and die material accumulation are reduced, the energy consumption is effectively reduced while the processing speed and efficiency are improved, and the performance of a plastic product is not changed; the auxiliary agent does not contain any fluorine-containing substance, does not generate fluorine-containing chemical residues, can play a role when the addition amount is relatively low, and can replace a traditional fluorine-containing polymer processing auxiliary agent.

The oval opening extrusion die head of the PTFE filament comprises a die head body, a through hole is formed in the die head body, the through hole comprises a guide-in section and an extrusion section, the guide-in section is in an oval hollow cone shape, and the extrusion section is in an oval tube shape. When a PTFE material is extruded through the extrusion die head, the cross section of a PTFE filament is in an oval shape, the problem that the PTFE filament expands after being demolded can be effectively solved, the stability of the PTFE filament after being demolded is improved, the calendering stress distribution is more uniform when the PTFE filament is subjected to calendering, and therefore the uniformity of a film is improved.

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.

The name of the invention is peroxide treated blown polymers with increased heavy expansion and constant mold release expansion. The ethylene-based polymers are generally characterized by a high load melt index of less than 12 g / 10 min, a weight average molecular weight of from 200,000 to 550,000 g / mol, a number average molecular weight of from 18,000 to 48,000 g / mol, a CY-a parameter of less than 0.12, a tan delta at 0.1 sec-1 of from 0.5 to 0.9 degrees, a tan delta at 100 sec-1 of from 0.5 to 0.75 degrees, and a viscosity at 0.001 sec-1 of from 1.3 x 106 to 1 x 107 Pa-sec. These ethylene polymers can be produced by peroxide treatment of bimodal molecular weight distribution dual metallocene catalyzed resins, and can be used to produce blown bottles and other blown products.

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 invention provides a nylon material with high strength and good chemical resistance and a preparation method thereof. The nylon material is prepared from the following raw materials in parts by mass: 40-90 parts of long carbon chain nylon, 5-40 parts of semi-aromatic nylon, 0-10 parts of a compatilizer, 0.1-2 parts of a chain extender and 0.1-2 parts of an antioxidant. Through the end group reaction between the long carbon chain nylon and the semi-aromatic nylon, the compatibility between the materials is improved, and the problem of extrusion swelling is solved, so that the nylon material has the advantages of high strength, high elongation at break, easiness in processing, excellent appearance and the like on the premise of keeping the chemical resistance advantage of the long carbon chain nylon; and various pipeline application requirements can be met.

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.