106results about How to "Improve injection molding effect" patented technology

A polypropylene resin composition which comprises:(1) 55 to 75% by weight of (A) a polypropylene resin consisting of a mixture of the following polymers (i) and (ii):(i) a propylene-ethylene block copolymer having a propylene homopolymer part which is the first segment and having a propylene-ethylene random copolymer part which is the second segment and(ii) a propylene homopolymer having an intrinsic viscosity [eta]P of 0.8 to 1.8 dl/g as measured in tetralin at 135° C.,(2) 21 to 30% by weight of (B) an ethylene-1-octene copolymer rubber having a melt flow rate (JIS-K-6758 at 190° C.) of 2 to 10 g/10 min and having a 1-octene component content of 20 to 25% by weight, and(3) 5 to 20% by weight of (C) talc having an average particle diameter of not more than 3 mum, wherein when the amount of the second segment contained in the propylene-ethylene block copolymer of the polypropylene resin (A) is designated as (A)' and the ethylene-1-octene copolymer rubber content is designated as (B)', the following expression is satisfied:and when the above composition is subjected to a tensile test according to ASTM D638, it exhibits, an ultimate elongation of at least 400%, and the melt flow rate (JIS-K-6758 at 230° C.) of the composition is at least 30 g/10 min, and an injection-molded article obtained by injection molding the above polypropylene resin composition.

The present invention provides a process for producing an injection molded product comprising injection molding a mixture containing a thermoplastic resin (A) and a polyolefin wax (B),

• • wherein the mixture has L/L₀≧1.05, the L being a flow length in the case where the mixture contains the polyolefin wax and the L₀ being a flow length in the case where the mixture contains no polyolefin wax, the L and L₀ being measured under the conditions of a mold temperature of 40° C. and a resin temperature, Tr, as determined by the following expression:

Tr=3/4×Tm+100

(wherein Tm represents a melting temperature (° C.) of the thermoplastic resin), using a spiral flow mold having a thickness of 1 mm and a width of 10 mm. According to the invention, by adding the polyolefin wax, a flow length of a thermoplastic resin can be lengthened, and releasability can be improved, and thus the thermoplastic resin can be thin molded or precision molded by injection molded without deteriorating the characteristics of the molded product to be obtained.

The invention discloses a polypropylene composite material for a seamless instrument board and a preparation method thereof. The polypropylene composite material for the seamless instrument board is prepared from, by weight parts, 40-60 parts of polypropylene, 10-20 parts of high density polyethylene, 15-25 parts of polyolefin elastomer, 20-30 parts of talc, 0.2-0.6 part of antioxidant, 0.4-1 part of light stabilizer, 0.5-3 parts of anti-scratching agent, 0.2-0.6 part of lubricant and 1-3 parts of toner. The prepared polypropylene composite material has high rigid-tough balance, low temperature impact, weather resistance and scraping resistance and can meet the performance requirements of automobile main engine plant seamless instrument boards. The polypropylene composite material further has excellent injection molding performance, and injection molding parts are excellent in appearance and free of defects such as tiger skin and gas marks.

The invention relates to a high-performance nano-crystalline soft magnetic composite material and a preparation method thereof. The high-performance nano-crystalline soft magnetic composite material is characterized in that the proportion of raw materials Fe: Cr: Si: B: C: polypropylene: lubricant: coupling agent: melt index regulator is equal to (40-59):(8-40): (8-20):(4-10):(1-5):(8-50):(4-10):(3-5):(3-8):(2-8) by mass percentage. The preparation method includes primary blending, high-speed water atomization, passivation, annealing process, primary grinding by a ball mill, secondary grinding by the ball mill, secondary blending, tertiary grinding by the ball mill, tertiary blending, high-speed mixing, granulating by extrusion and injection molding. The preparation method of the high-performance nano-crystalline soft magnetic composite material is suitable for production of magnetic circuit elements complicated in shape and high in precision requirements. The material prepared by the preparation method has the advantages of high magnetic conductivity, high-saturated magnetic induction strength, low coercivity and loss and high stability.

Use of a filled polymer resin in the manufacture of an article therefrom by injection moulding, a method of manufacturing an article by injection moulding a filled polymer resin, a method for enabling or improving the injection mouldability of a polymer resin comprising recycled polymer, wherein the polymer resin comprises recycled polymer and functional filler, the use of a functional filler in a polymer resin comprising recycled polymer to improve the injection mouldability of the polymer resin, an article of manufacture obtained by injection moulding a filled polymer resin, and a filled polymer resin.

A durable polyoxymethylene composition includes a polyoxymethylene copolymer with 1,3-dioxolane as a comonomer, a lubricant, an inorganic filler, a nucleating agent including a sodium salt, a stabilizer, an anti-static agent. A ramp is made of the durable polyoxymethylene. The ramp and the durable polyoxymethylene have excellent micro-wear-resistant property.

Provide is a flame-retardant polyester resin composition exhibiting excellent flame-retardant performance, specifically flame self-extinction performance and excellent injection moldability and blow moldability by biaxially-stretch blow molding method, by solving problem of poor injection moldability of the conventional polyester. A flame-retardant polyester resin composition comprising: (A) 50-80% by mass of a polyester resin, (B) 10-40% by mass of a polycarbonate resin, (C) 5-30% by mass of a polymer of a glass transition temperature Tg of less than 35° C., and (D) 0.5-5% by mass of a polymer of a carbon residue rate resin of at least 15%.

It is an object of the present invention to provide an injection-molded article such as a resin-made cage, a resin-made seal, a resin-made sliding bearing, and a resin-made gear having reliable flowability, enhanced mechanical strength and toughness, and improved wear resistance. A resin composition is composed of a biodegradable polyester polymer particularly polybutylene succinate to which not less than 10 wt % nor more than 40 wt % of a fibrous inorganic reinforcing material and not less than 0.5 wt % nor more than 10 wt % of polycarbodiimide resin are added. The injection-molded article is obtained by injection molding the resin composition.

The invention discloses an injection mold with the insert positioning function. The injection mold comprises an insert mounting part; the insert mounting part is provided with threaded holes and is arranged on a mold body in a threaded connection mode; an insert mounting groove is formed in the insert mounting part; an insert positioning part is arranged at the side edge of the insert mounting groove; a storage cavity is formed in the insert positioning part; a limiting ball and a spring are arranged in the storage cavity; the spring abuts against the limiting ball to enable the limiting ballto be in a working state; an electromagnet and a heating body are arranged in the insert positioning part; the electromagnet is electrified and then attracts the limiting ball so as to enable the limiting ball to be separated from the working state; after the heating body heats a heat conductive part, the heat is transmitted to the limiting ball through the spring so that a metal insert can be heated when the limiting ball works; a vent hole is formed in the bottom of the insert mounting groove and is connected with an air inlet part; and the air inlet part is connected to an air pump. Compared with the prior art, the injection mold with the insert positioning function has the advantages that the metal insert can be limited at a preset position, and therefore accidents caused by disengagement of the metal insert can be avoided.

Disclosed is an ink cartridge for an ink-jet image forming apparatus. The ink cartridge comprises an ink cartridge body having a plurality of ink chambers. The ink chambers are formed by two or more partitioning walls orthogonally intersected with each other within the ink cartridge body. A nose is formed at a position adjacent to the bottom surfaces of the ink chambers. The nose includes openings formed in the opposite sides and a plurality of ink feeding channels forming the central area between the openings and connected to the ink feeding channels, respectively. Sealing members seal each corresponding one of the nose openings.

The invention discloses an injection mold which comprises an insert mounting part. The insert mounting part is provided with threaded holes and is mounted on the mold through a threaded connection manner. An insert mounting groove is formed in the insert mounting part. An insert locating part is arranged on the side edge of the insert mounting groove. A containing cavity is formed in the insert locating part. A limiting ball and a spring are arranged in the containing cavity. The spring abuts against the limiting ball so that the limiting ball can be in a working state. A heating body is arranged in the insert locating part. A prospect hole is formed in the bottom of the insert mounting groove. A hydraulic oil cavity is formed in the insert mounting part. The prospect hole is connected with the hydraulic oil cavity. An ejection block and a piston block are arranged in the hydraulic oil cavity. An ejection rod is arranged on the ejection block. The ejection rod can stretch out of the prospect hole, and therefore a metal insert is jacked up. The piston block is connected with a push rod, the push rod is driven by a motor to work, and therefore the piston block is driven to move. Compared with the prior art, according to the injection mold, the metal insert can be stably limited at a preset position, and the situation that the metal insert is separated, and consequently accidents happen is avoided.

The invention discloses a screw-type injection molding machine for injection molding. The screw-type injection molding machine comprises a nozzle, a screw and a material crushing head. An injection molding flow pass is formed in the nozzle, and a nozzle flange is mounted on the right side of the nozzle. Inner hexagon screws are arranged on the upper side and the lower side of the nozzle flange correspondingly, and a charging barrel is mounted on the right side of the nozzle flange. A heat transfer metal ring is fixed to the outer wall of the charging barrel, and screw teeth are arranged on theouter wall of the screw. The screw is located in the middle of the charging barrel, and a control rod is arranged in the middle of the screw. Balls are inlaid in the outer wall of the control rod, and an electric heating wire sleeve is mounted on the upper portion of the right side of the screw. A material opening is formed in the upper portion of the electric heating wire sleeve, and a fine crushing knife is mounted on the outer side of the material crushing head. The material crushing head is located in the middle of the material opening. According to the screw-type injection molding machine for injection molding, the propulsion area of the screw can be adjusted, the propulsion angle of molten plastic by the screw can be adjusted, and the plastic can be finely crushed in advance.

The invention discloses a plastic injection mold, and relates to the technical field of injection molding. A rear formwork bottom plate is included. A rear formwork on the rear formwork bottom plate is detachably connected with a front formwork on a front formwork bottom plate. A cavity for mold injection molding is formed by a rear mold core formed by the upper portion of the rear formwork and afront mold core formed at the lower portion of the front formwork. Each exhaust assembly comprises a pipe cavity, wherein one end of the pipe cavity communicates with the cavity, the other end of thepipe cavity upwards extends out of the top face of the front formwork bottom plate, meanwhile, the pipe cavity is internally provided with a matched exhaust pipeline, and one end of the exhaust pipeline communicates with the cavity and is provided with a ventilation micro hole ring. According to the plastic injection mold, surplus air in the cavity is exhausted in time, accordingly, the phenomenonof air hole generation in the injection molding process is avoided, and the mold injection molding effect is improved; and an activated carbon adsorption plate can be utilized for adsorbing harmful molecules contained in hot melting plastic raw materials, and accordingly the body health of workers is facilitated while exhausting is guaranteed.

The invention relates to an injection molding method for a polymer rubber plate. A polymer rubber plate injection molding device is adopted, and comprises a bottom rack, a molding plate, a molding workbench, a vibrating mechanism, an adjusting mechanism and a feeding mechanism. According to the injection molding method, the problems existing in the injection molding process of the polymer rubber plate can be solved: a, in the traditional injection molding process of the polymer rubber plate, the size of a mold is fixed; if the specifications of the polymer rubber plates required for production are different, molds with different specifications are needed, and the molds need to be frequently replaced in the traditional injection molding process; the production cost is high, and the process is complex; b, in the traditional injection molding process of a molecular rubber plate, only a single polymer rubber plate can be subjected to injection molding, the yield is low; in the traditional injection molding process of the molecular rubber plate, the demolding efficiency is low, and the injection molding efficiency is low; and the yield of the polymer rubber plate is influenced.

The invention relates to the technical field of polyamide preparation, and discloses a preparation device of polyamide. The device comprises an injection molding machine, a screw rod and a drill bit,wherein the screw rod and the drill bit form a transmission device to extrude a polyamide liquid, a sleeve is arranged on the outer wall of the injection molding machine in a sleeve mode, a copper pipe is arranged in the sleeve, a threaded pipe is arranged in the copper pipe, the end part of the threaded pipe is connected with a supporting block, and an expansion body is arranged in the threaded pipe. The expansion body is automatically expanded according to the temperature of the injection molding machine, so that a cooling tube is opened, a cooling liquid is injected into the sleeve, the temperature of the injection molding machine is reduced, so that in the using process of the injection molding machine, the injection molding machine can be kept at a normal temperature all the time, theinjection molding machine can keep a good state in the injection molding process, the service life of a hydraulic element and an air cylinder in the injection molding machine is prolonged at the sametime, the abrasion degree of the drill bit and the injection molding machine can be reduced when the temperature of the injection molding machine is normal, so that the injection molding machine is always in a sealed state in the use process, the service life of the injection molding machine is prolonged, and the injection molding effect of the injection molding machine is improved.