277results about How to "Short molding cycle" patented technology

A bioplastic composition comprising a biopolymer containing from 10 - 40 wt% of coated inorganic particles; the particles being coated with one or more of fatty acids, fatty acid derivatives, rosins, rosinates, polyolefin based waxes, oligomers and mineral oils, and combinations thereof has improved stiffness and toughness and also has improved crystallisation kinetics rendering it useful for extrusion, injection moulding and thermoforming.

The invention discloses a degradable plastic composition as well as a preparation method and application thereof. The degradable plastic composition comprises the following components in parts by weight: 70-99 parts of at least two degradable resins, 0-6 parts of a toughening agent, 0.5-5 parts of a compatilizer, 0.05-3 parts of a chain extender, 0.05-5 parts of an anti-hydrolysis agent, 0.05-5 parts of a nucleating agent and 0.05-3 parts of a slipping agent. By matching two or more degradable resins, the problem of poor toughness or rigidity of the existing single degradable resin is solved,so that the product has excellent comprehensive mechanical properties, excellent rigidity and toughness, high impact property, high nominal strain at break and higher flexural modulus and tensile strength.

The invention relates to a production process for preparing a silica ceramic crucible by use of a pressure grouting method and belongs to the technical field of high-grade refractory materials in a polycrystalline silicon industry. The pressure grouting comprises steps of preparation of pouring slurry, die assembling, molding by pouring slurry and demolding for fetching a green body, i.e., (1) ball-milling fused silica grain composition into slurry; and (2) fixing a resin die and assembling the die, grouting, pressurizing quartz slurry with the initial pressure being 0.1-0.2Mpa, enhancing the pressure to 0.3-1.5Mpa after a die cavity is filled with quartz slurry, keeping the pressure for about 5 minutes to filter water in the silica slurry by virtue of a micro-reticular resin mold to form a square crucible green body, and during demolding of the green body, and applying pressure of 0.2-0.3Mpa to the surface of the green body through the back layer of the micro-reticular resin mold by utilizing compression air. The green body of the silica ceramic crucible, prepared by the process, has high intensity, does not have residual air holes and is easy to demold, the product is good in thermal shock resistance and high in temperature resistance, and can meet the process requirements of polycrystalline silicon production; and the process has the advantages of high biscuit drying speed, small occupied area for production, shortened manufacturing period, low cost, and suitability for scale production.

To provide an expansion injection molding process, which is freed from the occurrence of swirl marks on the surface of a molded article and by which foamed injection moldings having good appearance can be produced in a short molding cycle and at a low cost; and a mold for expansion injection molding.

A movable mold 2 is moved toward a fixed mold 1, whereby a sealing member 6 set on at least one of a pair of facing surfaces of the mold 1 and mold 2 in the outside of a cavity is brought into contact with the other of the facing surfaces or a sealing member 6 set thereon to make the cavity 3 gas-sealed state. While keeping the gas-sealed state, the movable mold 2 is further moved toward the fixed mold 1 with the sealing member 6 compressed, whereby the volume of the cavity 3 is decreased to enhance the pressure in the cavity 3 to a level exceeding the atmospheric pressure. Then, a thermoplastic resin is injected into the cavity 3 of an enhanced pressure.

The present invention provides a molding method capable of molding a thick-walled light guide plate of high quality by a short molding cycle. A predetermined amount of a molten resin is charged in the shaping space K constituted of the stamper (8) provided to the core (4) on the cavity side of a fixed mold, the core 23 on the core side of a movable mold and cores 30 and 30 on the peripheral wall side of the movable mold. Then, a valve gate is closed to compress the molten resin by the core 23 on the core side. Transfer properties are enhanced by compression and the molding cycle is shortened. At the time of compression, the temperature of the cores (30 and 30) on the peripheral wall side is made higher than the temperature of the core (4) on the cavity side and the core (23) on the core side. By this constitution, the cooling speed of the cores (30 and 30) on the peripheral wall side becomes slow to enhance a compression effect and the occurrence of a sink is suppressed.

The invention provides a punch forming method of a thin-wall end socket. The method comprises the following steps of 1, cutting a non-ferrous metal plate to obtain an end socket plate, and cutting a steel plate to obtain an upper steel plate and a lower steel plate; 2, putting the end socket plate between the upper steel plate and the lower steel plate, and welding the upper steel plate and the lower steel plate into a whole plate along a circular arc; 3, heating the whole plate; 4, carrying out punch forming on the heated whole plate to obtain an entire end socket; and 5, removing the upper steel plate and the lower plate to obtain the thin-wall end socket of which the wall thickness is 0.5-3.0mm. The punch forming method is novel in technique, reliable and practical, and advanced in process. Two steel plates are adopted to clamp the end socket plate in the middle; the thin-wall end socket is punched and formed by a common die; the problems of large size, thin wall and large molding difficulty of lined end socket of chemical equipment can be effectively solved; the quality and the yield of the thin-wall end socket are improved; and the production cost is greatly reduced, and the economic benefit is obviously improved.

The invention relates to the field of matrix resin used for a resin transfer molding technology, and discloses a composition for preparing transparent polyurethane, a workpiece and a forming method thereof, an automobile appearance part and a forming method. The composition comprises a component A and a component B; the component A comprises polyether glycol, polyester polyol and a micromolecule cross-linking agent; the component B is isocyanate, wherein the micromolecule cross-linking agent comprises an isocyanate active compound with tri-functionality and a compound C-A prepared from organicamines and bifunctionality epoxy resin through a reaction; the isocyanate active compound with tri-functionality is selected from one or more of trimethylolpropane, glycerin, triethanolamine and diethanolamine; in the component A, by weight, 50-90 parts of polyester glycol, 0-25 parts of polyester polyol, 0-10 parts of isocyanate active compound with tri-functionality and 10-25 parts of the compound C-A are contained; the weight ratio of the component A to the component B is 1:3-3:1. When the composition is used for RTM forming processing, curing speed is high, the forming period is short, and heat resistance is improved.

The invention belongs to an efficient compound thermoplastic elastomer and provides a full curing thermoplastic elastomer which is more oil-resisting than a common full curing polyolefine thermoplastic vulcanized rubber. The elastomer adopts a compound system of an ethylene propylene diene rubber, a nitrile rubber and a polyolefine resin and a compound system of a maleic anhydride graft, a carboxylic acrylonitrile butadiene rubber and organic aminated compounds. The compound thermoplastic elastomer has excellent oil-resisting property and mechanical property.

The invention provides an injection compression molding composite mould. On the basis of a common valve type hot runner injection mould, a compression gap is reserved between a cavity plate and a core insert fixing plate; a slide block is pushed by a compression hydraulic cylinder mounted on a movable mould seat plate to slide horizontally on the movable mould seat plate; the horizontal movement is converted into movement vertical to mould splitting surfaces of other parts except the cavity plate, namely a fixed slide block, a pressure plate and a movable mould side through a contacted surface of a movable slide block and the fixed slide block; and finally, movement relative to the reserved compression gap is formed between a core insert and the cavity plate. A common injection molding machine does not have a secondary mould closing function and the composite mould can realize an injection compression molding process on the common injection molding machine, so that the precision of a product is improved on the basis of existing equipment and control system, and the application range of the common injection molding machine is enlarged.

The invention discloses a method for constructing a high pier, which comprises the following steps of: 1) constructing a first section of pier through at least two upper and lower templates; 2) after concrete strength in a bottom template is more than or equal to 75 percent of design strength and concrete strength in the uppermost template is more than or equal to 2.5Mpa, detaching the bottom template and turning the bottom template above the uppermost template to serve as a second section of pier for installation, and finishing construction of the second section of pier; and 3) repeating the step 2) until construction of the whole pier is finished. Compared with a sliding formwork method, the method has the advantages that: the molding period is short, the pier is convenient to construct, and the method is convenient to operate; and compared with a creeping formwork method, the method has the advantages that: the molding period is short, a high scaffold is not needed to be erected, a few materials are occupied, and construction cost is low. The method has the advantages of sliding formwork and creeping formwork construction methods, the turnover period of the template is short, the construction period of each section of pier is short and is generally about five days, and the concrete joint of the pier has high quality.

The invention belongs to the technical field of high polymer materials and relates to a preparation method of a pipe. The preparation method comprises the following steps of: (1) placing a compound prepreg tape in a winding device, and then enabling the compound prepreg tape to pass through each tension roller in the tension roller group sequentially; (2) pre-heating the compound prepreg tape which is treated in the step (1); (3) heating the compound prepreg tape preheated in the step (2) at a winding point; (4) winding the compound prepreg tape heated in the step (3); and (5) finally, solidifying and shaping in situ to obtain the pipe. Compared with the prior art, the preparation method of the continuous fiber-reinforced thermoplastic compound prepreg tape pipe, disclosed by the invention, has the advantages of low cost, simple equipment, short shaping period and the like; and the produced thermoplastic compound pipe has a light weight, is high-pressure resistant and anticorrosive, and can be applied to the high-end field such as petrochemical engineering.

The invention relates to the field of rubber materials, in particular to a high-temperature-resistant easy-to-form PC/PCTG material and a preparation method thereof. The high-temperature-resistant easy-to-form PC/PCTG material is prepared from the following components in percentage by mass: 50-70% of PC, 20-60% of PCTG, 0.05-0.3% of a lubricating agent, and 0.2-0.4% of an anti-oxidant. The high-temperature-resistant easy-to-form PC/PCTG material is high in flowing property, is good in processing and forming property, is good in heat resistance and is high in mechanical strength.

The present invention discloses a quick die-making technique, in particular, it is a high-accuracy quick die-making technique by utilizing the high-new techniques of computer, quick raw pattern manufacture and numerical control, etc. It is characterized by that it uses the new product design modulus or drawing as basis, and adpts the following steps: stamping and forming, making analysis, utilizing CAD software to design technological main model with technical supplement, then making quick raw pattern or utilizing numerical control technique to make main model by using foamed plastic as raw material, then making technological stage die, and according to the stage die casting alloy die, detecting the die, pressure testing so as to obtain the presswork.