Type Of Cooling In Plastic Extrusion
There are two main purposes for polishing precision stamping dies. One is to increase the brightness and precision of precision molds. The second is to make the mold easy to demould.
In the polishing process, the coarse oil stone is generally used first, and the surface of the machined mold cavity is roughly polished, and the tool marks of the machine and the tool are polished. Then use a fine oil stone to polish the polishing marks of the rough stone. Then use a fine sandpaper to polish the polished surface of the fine stone. Finally, using a polishing paste or a polishing paste, the final surface of the cavity of the mold is polished and polished to achieve a bright, mirror-like effect.
1.Mechanical polishing
Precision stamping die mechanical polishing is a polishing method that removes the polished convex portion and obtains a smooth surface by cutting, plastic deformation of the material surface, and the like. Generally, oil stone strips, wool wheels, sandpaper, etc. are used, which are mainly operated by hand. For special parts such as the surface of the rotary body, auxiliary tools such as a turntable can be used, and the method of super-fine polishing can be used for high surface quality requirements.
Ultra-fine grinding and polishing is a special-purpose grinding tool. In the polishing liquid containing abrasive, it is pressed against the machined surface to perform high-speed rotary motion. With this technology, the surface roughness of Ra0.008μm can be achieved, which is the most efficient among various polishing methods. This method is often used in optical lens molds.
3. Cooling of the product
Product cooling is an important measure to ensure the geometry and internal structure of the product. After the plastic extrusion coating leaves the machine head, it should be cooled immediately, otherwise it will be deformed under the action of gravity.
The problem of crystallization can be ignored for amorphous materials such as polyvinyl chloride. The plastic product can be quenched by direct cooling with water, so that it is cold-permeable in the cooling water tank and no longer deformed. For the cooling of crystalline polymers such as polyethylene and polypropylene, the problem of crystallization should be considered. If the quenching method is adopted, it will adversely affect the structure of the plastic product and generate internal stress. This is one of the reasons for the cracking of the product in the future, and it must be taken seriously in the extrusion process.
The extrusion layer of a crystalline plastic such as polyethylene or polypropylene is preferably carried out by a stepwise cooling method using a warm water cooling method. Generally, depending on the auxiliary equipment of the equipment, the cooling water tank should be segmented and divided. The water temperature can be started from the plastic extrusion layer into the first stage of the water tank at a temperature of 75 ° C ~ 85 ° C, the water temperature is reduced step by step, until the room temperature, the smaller the temperature difference of each section of water temperature is more reasonable.
Related Products
This is custom heading elementDescriptionFeedbackDescription Specification: Part Name Customized Rubber Compression Silicone Cover for Bluetooth Horn Speaker Service OEM OR ODM Part Material Silicone or rubber (NR, NBR,SBR,BR,IR,CR,EPDM,IIR,VITON(FKM),SIR,PU,ACM,CO,etc) Material Hardness Silicone about 5~90 Shore A; rubber about 10~90 Shore A Size Customized Shape Customized Color Customized according to Pantone colors Appearance as customer’s requirement Drawings 2D OR 3D acceptable Temperature Resistance -40~300 degree centigrade Technology Hot pressing molding or injection Molding Second Processing Vulcanizing/ Deburring/Silk-screen/Carving/printing Quality control internal QC control Part Feature 1.Oxidation , Chemical,oil, acid ,alkali , weather resistance 2. colorful ,Anti-aging,good flexibility, good elasticity Food grade material FDA or LFGB Package Normally PE bag+carton or customized as customer’s request Trade Term Ex-works; FOB Shenzhen/Guangzhou ; CIF Specification ROHS Directive Compliant Green Products What is our advantage? 1. Has sound and mature supporting supply chain 2. Lower mold costs…
Stamped Anchor Frame for Door ComponentsDescriptionFeedbackDescription Stamped computer housing made as clients’ drawing Die type: Progressive die. Raw materials: DC zinc coated, S/S, cold steel, copper, brass, aluminum, all variant raw material available. Surface finish: Powder coating Tooling lifespan: 1 million Feeding machine and stamping machine are used We have our own maintenance team…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription Cavity/Core Material 718H, P20, NAK80, 2316,2738,Din2344,H13 and available Product Material ABS, PC, PP, PVC, POM, PMMA, PS, PE, PET, Rubber, Silicone, PA, PBT, PEI, etc. Base (HASCO) German , FUTABA Japan, DME US, LKM China or by requested Structure Double color injection mould, Solid…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription TV Shell Injection Molding Product Name Injection Molding for TV Case Cover Material ABS, PC, PP, PS, POM, PMMA etc. Mould Base Material: LKM, FUTA, HASCO, DME, etc. or as per customer’s requirement. Surface treatment powder coating, polishing, chrome plating Packing Inner-Plastic Bag; Outer -Standard Carton Box. Usage…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription Scale Model Cars Many miniature vehicles were originally aimed at children as playthings. But Precision-detailed miniatures made specifically for adults are a significant part of the market now. Fit Precision Mold Co., Ltd is specialized in producing all kinds of plastic scale model cars and accessories in different…
This is custom heading elementDescriptionFeedbackDescription Product Design Begin with good design FPM has the unique ability to contribute value at every phase of your product development via our global technical expertise. With state of the art design services, the right tools and a full staff of experienced people on hand, FPM can help…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription CNC Plastic Machining Prototype Services Rapid prototyping (RP) technology is an advanced manufacturing technology developed in 90s, is one of the key technologies for the development of new products and manufacturing enterprises, to promote product innovation, shorten the development cycle of new products, improve product competitiveness has a…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription FIT PRECISION MOLD CO., LTD specializes in providing good design and high-precision products at product developing and producing area. Our professional staff are experienced at tool/mold making service including plastic injection mold (mould),die casting mold (mould) and metal stamping mold (die); At the same time we are involved…