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PVC injection molding plastic resin -1
2022 / 11 / 12
PVC plastic is a heat-sensitive material that features a poor injection moldability, for which the reason is that an excessively high melt temperature or an excessively long heating time easily causes PVC decomposition. Therefore, the key to molding the PVC products lies in the control of the melting temperature. PVC injection molding plastic resin The heat sources for melting the raw PVC material are usually from two aspects, i.e., the shear heating generated by screw motion and the resistance wire heating provided by the outer wall of the barrel, among which, the former is the main source, while the latter is mostly provided during machine operation. Due to the unsatisfactory heat transfer property of the PVC material, although the outer portion is heated, the inner portion of the material is still in a solid state, and even when the outer portion starts to decompose due to overheating, there may still be an unmolten portion inside. Various reasons must be fully considered during product design, mold design, and the plastic injection molding process, etc. In particular, the special PVC injection molding machine from outstanding manufacturers can be selected to create the ideal product.
2022 / 11 / 11
Future of Processing Aids Owing to the advantages of using processing aids, they are not likely to be eliminated; however, continuous improvements in processing methods and equipment may make them obsolete. Improvements in the formulation and application of processing aids also might make them more effective and more ethical for their intended use. Finally, companies may opt to select more ethical processing aids or include them in their ingredient list.
2022 / 11 / 11
Purpose of Processing Aids The primary purpose of a processing aid is to facilitate the manufacturing of a food product. Processing aids are used for variety of reasons: Improve product quality and consistency. Enhance nutrition. Help maintain product wholesomeness. Enhance shelf life. Help packing and transportation.
2022 / 11 / 11
Introduction Processing aids are substances or additives of natural or synthetic origin used in the production of foods. They are commonly used in a wide variety of products including bakery, confectionery, jams, jellies, meat and produce. The Food and Drug Administration or United States Department of Agriculture must approve processing aids prior to commercial use. They are considered extremely safe and are used in small volumes and do not alter the taste or appearance of the finished product. The objective of this fact sheet is to describe the purpose and use of processing aids in the food industry.
What role does PVC foaming regulator play in processing
2022 / 11 / 05
In terms of technology and quality, PVC foaming regulator can improve the solution elasticity of the product during calendering and make smooth rolling; in pipe extrusion, it can improve the apparent quality, eliminate the phenomenon of "shark skin", and improve extrusion. out rate. As a common additive, the use of PVC foaming regulators can be said to be very common, but what role can PVC foaming regulators play in the processing process? Specifically for the process and products, the PVC foaming regulator can improve the melt elasticity during the calendering process, so that the remaining material between the two rolls smoothly; in the pipe extrusion, it can improve the apparent quality and eliminate the "shark skin" phenomenon. Increase extrusion rate; greatly reduce the number of "fish eyes" in the product when extruding transparently. Increasing melt elasticity in injection molding, thereby reducing injection volume, reducing the "white streak" phenomenon, improving surface gloss, improving weld strength, and adding lubricity processing aids can improve release efficiency, speed up injection cycles, and increase output, to prevent the phenomenon of "blooming" caused by the precipitation of external sliding; in blow molding, it can improve plasticization, reduce the fish-eye phenomenon, improve the elasticity of the melt, and make the molding thickness more uniform. After this brief introductio
Reasons why CPE can be used as an impact modifier
2022 / 11 / 05
As an excellent impact modifier, CPE chlorinated polyethylene has been applied in many aspects, which can greatly improve the impact resistance of hard products and improve processing fluidity; at the same time, it also has good chemical resistance, low-temperature performance, excellent weather resistance, and compatibility. At present, it is the most widely used and most economical impact modifier in the PVC pipe profile industry. It can improve the impact resistance and aging properties, especially for large-diameter pressure-resistant liquid pipelines. In order to improve the pressure-bearing capacity and increase the Most of the service life is made of chlorinated polyethylene. In addition, CPE resin is used as an impact modifier, and the compatibilizer is used in flame retardant ABS, SAN, HDPE, and PP, which can improve the impact resistance and flame retardant effect of the impact modifier.
Improvement of Resin by Processing Aid of CPE
2022 / 11 / 05
1. Melt rheology modification: PVC melt has the disadvantages of poor strength, poor ductility and melts fracture, and PVC processing aids can improve the above problems of melt. Its mechanism of action is: to increase the viscoelasticity of PVC melt, thereby improving die expansion and increasing melt strength; 2. Endows lubricity: The PVC-compatible part of the processing aid is first melted to promote melting; while the incompatible part with PVC migrates out of the molten resin system, thereby improving mold release; 3. Promote resin melting: When the PVC resin is heated under shearing force, the processing modifier first melts and adheres to the surface of the PVC resin particles. Based on its compatibility with the resin and high molecular weight, the viscosity, and friction of the PVC increase. This effectively transfers shear stress and heat to the entire PVC resin, accelerating PVC melting.
2022 / 11 / 05
Magnesium hydroxide is the second largest sales volume of inorganic hydroxide flame retardants. It is a white to light white lens powder with a relative density of 2.4 and a Mohs hardness of 3.0. When heated to above 450°C, the weight will be reduced by 30.9% (mass fraction) due to the loss of water. When magnesium hydroxide is used as a flame retardant, its purity requirements are quite high, containing at least 98.5% magnesium hydroxide, and many grades are higher than 99.5%. Most flame retardant grades are white powders, with particle diameters ranging from 0.5 to 5 μm. The surface area is 7~15 square meters/g. Most of the magnesium hydroxide used as a flame retardant has been surface treated to improve its dispersion and distribution in the polymer. Magnesium hydroxide and aluminum hydroxide are used in a higher dosage, generally 50% to 70%. Due to high purity requirements and surface treatment requirements, magnesium hydroxide is more expensive than precipitation grade aluminum hydroxide. Magnesium hydroxide is used to process thermoplastics and thermosetting resins with a processing temperature of 200~225℃. Mainly used in EVAC, PP and blends, ABS and blends, fluoropolymers, PPE and blends, polyimides, etc. Cannot be used for thermoplastic polyester. Magnesium hydroxide is used together with aluminum hydroxide to meet different requirements. Magnesium hydroxide is also used in parts such as wires and cables, racks, buildin
Classification Of Flame Retardant Masterbatch
2022 / 11 / 05
Due to the advantages of flame retardant masterbatch (masterbatch) used in plastics in flame retardant efficiency, environmental protection, improved production efficiency, convenience, etc., it has become an effective substitute for traditional flame retardants and has been widely used in plastic manufacturing. Pelletizing, extrusion, injection molding, etc. The flame-retardant masterbatches that can be promoted are halogen-based (Br, Cl), phosphorus-based (red phosphorus, phosphorus compounds, etc.), nitrogen-based (usually called intumescent flame-retardant masterbatch) and inorganic flame-retardant masterbatch (hydrogen Mainly alumina, magnesium hydroxide, etc.). Halogen-based flame-retardant masterbatch (masterbatch) is currently the most respected flame-retardant masterbatch in most resins. The reason is that its own organic properties make it have a better affinity with plastics, so the mechanical properties of the finished products are reduced. Less and high flame retardant efficiency, less addition in resin, high cost performance. The disadvantage is that some are biologically toxic, which is prohibited in some international standards. And due to poor environmental performance, especially in Europe, there is a tendency to be eliminated. Phosphorus-based flame-retardant masterbatch is also a commonly used product. In some resins, its flame-retardant efficiency is even higher than that of halogen-based resins. However, it has poor color coor
Characteristics Of Flame Retardant Masterbatch
2022 / 11 / 05
1. Easy to use: flame retardant masterbatch (masterbatch) is mostly tablet-like or strip-like tablet-sized particles, which are exactly the same size as general plastic particles, which improves the compatibility between them, makes it easier to disperse and add, and is hygienic And reduce volatile waste. 2. Good compatibility with resin: In general, the flame retardant masterbatch (masterbatch) has been specially treated to improve its compatibility with plastic resin, so that its addition in the resin will not change even if the amount is large. Prone to problems such as delamination, blooming, and patterns. 3. Reduce costs and increase the added value of products: often through the addition of flame-retardant masterbatch (masterbatch), general plastics have or are close to the application requirements of engineering plastics, which increases the added value of products and reduces the cost of raw materials. Novista Group supplies DBDPE, BDDP, FR245, TTBP,SR130 to global market.
the main applications of PVC granules
2022 / 10 / 29
the main applications of PVC granules are divided into: 1. PVC general soft products. The extruder can be extruded into hoses, cables, wires, etc.; with injection molding machine with a variety of molds, can be made into plastic sandals, soles, slippers, toys, auto parts and so on. 2. PVC transparent sheet PVC added impact modifier and organotin stabilizer, mixed, plasticized, calendered into a transparent sheet. It can be made into a thin-walled transparent container by thermoforming or used for vacuum blister packaging, and is an excellent packaging material and decorative material. 3. PVC foam products When soft PVC mixing, add appropriate amount of foaming agent to form a sheet, foamed into foam, can be used as foam slippers, sandals, insoles, and shockproof cushioning packaging materials. It can also be used as a low-foaming hard PVC sheet and profiled material, which can be used as an alternative building material. 4. PVC transparent material After the PVC and the additive are mixed and plasticized, a transparent or colored film of a predetermined thickness is formed by using a three-roll or four-roll calender, and the film is processed by this method to become a calendered film. It can also be processed by shrinking and heat sealing bags, raincoats, tablecloths, curtains, inflatable toys, etc. Wide transparent film for greenhouses, plastic greenhouses and mulch. The biaxially stretched film, which is subjected to heat shrinkage, can be used for shrink packaging. 5. PVC coated products The artificial leather with a substrate is coated with PVC paste on cloth or paper, and then plasticized at 100 degrees Celsius or more. It is also possible to first roll the PVC and the auxiliary into a film and then press it together with the substrate. The substrateless artificial leather is a soft sheet which is directly rolled by a
advantages and disadvantages of calcium zinc, lead salt stabilizer
2022 / 10 / 29
1. Lead salt stabilizer Advantage: Good thermal stability, especially good long-term thermal stability; ⊙Good electrical insulation and weather resistance; ⊙ Low price; ⊙Good processing performance suitable for various processes; Disadvantages: ⊙Color aberrations cannot be used for transparent products! Two words: poisonous (ˇˍˇ) 2.Calcium and zinc stabilizer advantage: ⊙Green products; ⊙ Thoroughly solve the phenomenon of sulfur and lead pollution; A small amount of lead in the material may be combined with sulfur in the air, especially in high temperature and high humidity places. ⊙Good switching adaptability; if you originally used lead salt stabilizers, replacing other stabilizers may cause cross-contamination, but calcium and zinc stabilizers can dispel your concerns. ⊙ Light weight, can increase the inorganic filler appropriately, reduce costs. Second, the use of calcium and zinc stabilizers: ⊙Confirm the environmental protection of the stabilizer formula; you need to pay attention to whether the content of heavy metals (lead, cadmium, tin, barium) can meet the product and meet the requirements of the new national standard. ⊙Calcium and zinc stabilizers have strong internal lubrication and require more external lubricants. This is described below. ⊙Calcium and zinc stabilizers have weaker thermal stability than lead salts, a narrower processing window and higher control requirements. Pay attention to the mold cleaning cycle during operation. The calcium and zinc stabilizer lubricant is added in a large amount, which easily leads to increased precipitation, which affects the mold cleaning cycle. For large-scale production, it has a greater im
Comprehensive analysis of diversified application of CPE
2022 / 10 / 29
1.What are the applications of chlorinated polyethylene-CPE? Chlorinated polyethylene,CPE can be processed by injection molding and extrusion molding. However, because CPE contains a large number of chlorine atoms, a certain proportion of heat stabilizers, antioxidants and light stabilizers should be added to the CPE before molding to protect the stability of its composition and performance. CPE with low chlorine content can also be used for rotational molding and blow molding. At present, chlorinated polyethylene is mainly used as a modifier of PVC, HDPE and MBS in the plastic products industry. After blending a certain proportion of CPE in polyvinyl chloride resin, products such as pipes, plates, wire insulation coatings, profiles, films, shrink films, etc. can be extruded using general PVC processing equipment; it can also be used to coat and compress mold Plastic, lamination, adhesion, etc .; used as modifiers of PVC and PE, can improve product performance, improve the elasticity, toughness and low temperature performance of PVC, brittleness temperature can be reduced to -40 ℃; weather resistance , Heat resistance and chemical stability are also better than other modifiers; As a modifier of PE, it can improve the printability, flame retardancy and flexibility of its products, and increase the density of PE foam. 2.What role does CPE play in plastics production? Chlorinated polyethylene (CPE) is a saturated polymer material. Its appearance is white powder, non-toxic and odorless. It has excellent weather resistance, ozone resistance, chemical resistance and aging resistance. It has good oil resistance, flame resistance and coloring. performance. Good toughness (still flexible at -30 ° C), good compatibility with other polymer materials, high decomposition temperature, decomposition to produce HCl, HCL can catalyze the dechlorination of CPE. Chlorinated polyethylene is a polymer materia
How Do You Operate and Maintain Plastic Injection Molds? -1
2022 / 10 / 29
When compared with other tools, the plastic injection mold is more complicated and precise, with higher requirements for operation and maintenance. As a result, throughout the entire production process, their correct use and meticulous mold maintenance are of great significance to maintain the normal production and improve the efficiency of a company. 1. Select the right molding equipment, and determine the reasonable process conditions. If the injection molding machine is too small, it will not meet the requirements; if too large, it will waste resources. Also, it may damage the mold or the mold plate due to the improper adjustment of the clamping force, while at the same time affecting the production efficiency. When selecting the injection molding machine, check the maximum injection volume, the effective distance of the tie rod, the mold installation dimensions on the plate, the maximum mold thickness, the minimum mold thickness, the plate stroke, the ejection type, the ejection stroke, the injection pressure, and the clamping force, etc. and choose the one that meets the requirements. The reasonable determination of the process conditions is also one of the factors that ensure the correct use of the mold. If the clamping force, the injection pressure, the injection speed and the mold temperature, etc. are set to be too high, the service life of the mold will be affected.
How Do You Operate and Maintain Plastic Injection Molds? -2
2022 / 10 / 29
3. When the mold is being used, a normal temperature should be maintained to help extend the service life of the mold. 4. Sliding parts on the mold, such as the guide pin, the return pin, the push rod and the core, etc., should be inspected, cleaned and lubricated regularly. Especially in summer when the temperature is high, add lubricants at least two times per shift, so as to ensure that these sliding parts are smooth enough to prevent seizures. 5. Each time before closing the mold, check whether the mold cavity is cleaned or not – no residual products or any other foreign objects are allowed. It is strictly forbidden to use hard tools to clean the cavity, so as to prevent the cavity surface from being damaged. 6. As for molds with special requirements for the cavity surface, the surface roughness (Ra) should be no higher than 0.2cm. It is absolutely not allowed to wipe it with hand or cotton fabrics. Instead, it should be cleaned with a compressed air blower, or gently wiped with high-grade alcohol napkins or absorbent cottons.
What's the Difference Between PVC and CPVC Pipe? -1
2022 / 10 / 29
PVC vs CPVC You`re probably familiar with PVC pipe. It's the white plastic pipe commonly used for plumbing and drainage. PVC stands for polyvinyl chloride, and it`s become a common replacement for metal piping. PVC`s strength, durability, easy installation, and low cost have made it one of the most widely used plastics in the world. PVC is a thermoplastic material that is molded into different shapes to create pipes, fittings, valves and other liquid handling supplies. Other Differences Between PVC & CPVC: There are a few other differences between the two materials. Most North American PVC pipe uses a Nominal Pipe Size (NPS), while CPVC is available in either NPS standard sizing -OR- CTS (Copper Tube Size) sizing. The copper tube sizing system is an entirely different sizing system from Nominal Pipe Size, and as the name implies it is the same system used for copper tube pipe.
What's the Difference Between PVC and CPVC Pipe? -2
2022 / 10 / 29
Applications of PVC & CPVC: As mentioned before, CPVC is more suitable for hot water applications up to 200F. PVC is still often used for unheated water as well as for vent and drainage systems; however, CPVC has become widely used for both hot and cold potable water. The more resistant properties of CPVC make it useful for commercial and industrial applications as well. Because of its wider range of applications, CPVC is usually pricier than PVC. That being said, it is still a very cost-effective and versatile material. We recommend the use of PVC for recreational use/building, cold water systems, vent systems, and drainage systems. CPVC is recommended for applications where the maximum temperature will exceed 140 degrees Fahrenheit, but stay under CPVC's max rating of 200 degrees Fahrenheit. Another deciding factor in which material to use is the chemical makeup of media being handled in your application. Though PVC and CPVC both are resistant to many of the same c
Ways to achieve flame retardancy
2022 / 10 / 29
Gas phase flame retardant mechanism. That is, it suppresses the freedom of chain growth in the combustion reaction and exerts a flame retardant effect. Condensed phase flame retardant mechanism. It prevents the thermal decomposition of the polymer in the solid phase and prevents the polymer from releasing combustible gas. Interrupt the heat exchanger management. That is, the heat generated by the polymer is taken away without being fed back to the polymer, so that the polymer no longer decomposes continuously. Novista Group supplies DBDPE, BDDP, FR245, TTBP,SR130 to global market.
2022 / 10 / 29
Aluminum hydroxide is one of the most widely used flame retardants. It is a non-toxic, white to light white powder with a relative density of 2.42 and a Mohs hardness of 3.0. When the temperature is heated to higher than 320°C, aluminum hydroxide loses 34.6% of its weight due to water loss. For polymers whose processing temperature is lower than the decomposition temperature of aluminum hydroxide (190~230℃), aluminum hydroxide is an excellent flame retardant material. It is worth noting that the size of the particle diameter has an effect on thermal stability. As a flame-retardant material, aluminum hydroxide is used in elastomers, thermosetting resins and thermoplastics. It is also used in large quantities in the production of flame-retardant carpets in styrene-butadiene latex, in the production of flame-retardant insulated rubber cables and thermal insulation foam , Conveyor belt and hose, etc. It can be used in all unsaturated resins, such as laminated large ceilings and walls, used in bathroom appliances, decorative wall panels, various covers, automobile protective covers, truck parts, etc., and electronic components including insulators and circuit boards. It also includes construction equipment and so on. Aluminum hydroxide is used in epoxy resins and phenolic resins, including adhesives, laminates, circuit boards, imitation marble and ceramic ap
The practical flame retardant technologies of silicon-containing compounds include:
2022 / 10 / 29
1. Introduce silicon atoms or silicon groups into the polymer through grafting reaction; 2. Add silicone powder; 3. Add high molecular weight silicone oil, organometallic compounds, and white carbon black; 4. Combined use of silicone rubber and metal compounds; 5. Polymer/clay nanocomposite materials; 6. Add main silicate; 7. Simultaneous use of silica gel and potassium carbonate;
What causes cracking in plastic injection molded parts?-2
2022 / 10 / 22
(5) It should be noted that amorphous resins, such as AS, ABS and PMMA, are more prone to residual stress than crystalline resins, such as PE and POM. During product ejection, stress is generated due to the high ejection force caused by the small draft angle, rough mold core / cavity. Sometimes, even ejector marks or cracking occurs around the ejector pin. Just look closely at the location of cracking to identify the cause. Stress is the most likely to occur when metal inserts are involved in the plastic injection molding process. And, the cracking usually occurs after a period of time, so it is extremely harmful. The stress is mainly caused by the large difference in thermal expansion coefficient between the metal and the resin materials. As time goes by, the stress exceeds the strength of the resin material that gradually deteriorates, so cracking occurs. In order to prevent the cracking thus caused, as a rule of thumb, the general-purpose PS is basically not suitable for inserts, while the impact of the inserts on the nylon material is minimal. Thanks to the small thermal expansion coefficient, the glass fiber reinforced resin is more suitable for the application of inserts.
What causes cracking in plastic injection molded parts? -1
2022 / 10 / 22
Cracking is a commonly seen defect in plastic injection molded products, of which the main causes are stress and deformation, mainly including residual stress, external stress and product deformation caused by external environment. (I) Cracking caused by residue stress The residual stress is mainly generated in the following three scenarios, i.e., overfilling, product ejection and metal inserts. The cracking generated in the case of overfilling can be solved from the following aspects: (1) Since the direct gate is able to minimize pressure loss, if cracking is mainly generated around the direct gate, you can opt for the multi-point gate, the side gate or the tab gate. (2) On condition that the resin material does not decompose or deter
Flame Retardants Are By Your Side
2022 / 10 / 22
In the 1950s, with the explosive development of materials technology, organic polymer materials began to be widely used in various fields of production and life. Plastics, rubber, textiles, and coatings with polymer materials as the main components have become our indispensable production elements. Electrical appliances, tableware, vehicles and other items made of polymer materials have brought great convenience to our lives while also bringing There are a lot of security risks. Due to the low oxygen index of polymer materials, air with an oxygen content of 21% is sufficient to meet the combustion conditions of most polymer materials. In addition, when polymer materials burn, they release smoke and toxic gases, which not only endanger human health, but also cause environmental pollution. In order to reduce the flammability of polymer materials and prevent fires, flame retardants have emerged. Flame retardants, as the name suggests, are additives that can be used to prevent the flammability of materials, that is, prevent materials from being ignited and inhibit flame propagation. There are many types of flame retardants, which can be roughly divided into organic flame retardants and inorganic flame retardants. Among them, organic flame retardants include halogen flame retardants, phosphorus-nitrogen flame retardants, organic phosphorus flame retardants, silicone flame retardants and the like. We select several types of flame retardant mechanisms to introduce.
5 Minutes To Understand Magnesium Hydroxide Flame Retardant
2022 / 10 / 22
Magnesium hydroxide is a new type of filled flame retardant. It releases bound water when it is thermally decomposed and absorbs a large amount of latent heat to reduce the surface temperature of the synthetic material it is filled in the flame. The generated combustible gas cools. Magnesium oxide produced by decomposition is a good refractory material and can also help improve the fire resistance of synthetic materials. At the same time, the water vapor it emits can also be used as a smoke suppressant. Magnesium hydroxide is recognized as an excellent flame retardant with three functions of flame retardancy, smoke suppression and filling in the rubber and plastic industry. It is widely used in polymer materials such as rubber, chemicals, building materials, plastics and electronics, unsaturated polyester, paints, and coatings. Especially for mine air duct coated cloth, PVC whole core conveyor belt, flame-retardant aluminum-plastic board, flame-retardant tarpaulin, PVC wire and cable material, mining cable sheath, cable accessories, flame retardant, smoke suppression and antistatic , Can replace aluminum hydroxide, has excellent flame retardant effect. Compared with similar inorganic flame retardants, magnesium hydroxide has better smoke suppression e
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