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Innovations and Advances in PVC Technology-3
2021 / 12 / 16
PVC Compound Some companies have developed a renewable modifier for PVC that increases the strength and resists fungi and biodegradation. PHA (polyhydroxyalkanoate), a biobased copolymer, offers improved processing with all PVC compounds. While the PHA polymer is biodegradable, when used in a non-biodegradable polymer, the biodegradation process is not increased. The modifier does not migrate and provides easier handling and processing. This formulation allows for using a single product in formulation to eliminate multiple modifiers and processing steps. The PHA modifier gives higher flexibility and impact resistance to flexible and semi-rigid PVC. A next-generation PHA is being optimized for rigid PVC in outdoor use. The modifier should combat the poor light stability and oxidation of ABS (Acrylonitrile Butadiene Styrene) and MBS (Methaacrylate Butadiene Sty
Impact Modifier Industry Status
2021 / 12 / 13
Companies that produce impact modifiers, especially ACR and MBS production companies, implement technology monopoly, basically do not transfer technology, and set up factories in Asia close to market regions individually or jointly in order to occupy potential markets. In the future, the development of global impact modifiers will be dominated by ACR and MBS. In addition to being used in PVC processing, impact modifiers are being extended to PC, PBT, nylon, ABS and other resins to improve processing performance and increase impact strength.
Introduction To The Characteristics Of Impact Modifiers
2021 / 12 / 12
According to a report by the American Plastics Industry Consulting Corporation, the global market demand for plastic impact modifiers in 2004 was 600,000 tons (approximately $1.5 billion in market value), among which styrene copolymers such as ABS, methyl methacrylate-butadiene-benzene Ethylene (MBS) has become the largest category of impact modifiers, accounting for about 45% of the market share, and acrylics accounted for nearly 30%; elastomers including EPDM and thermoplastic elastomers (TPE) account for about 10% of the market share; chlorinated polyethylene (CPE) ) Accounted for 10%, others accounted for 5%. It is predicted that between 2004 and 2009, the average annual growth rate of styrene impact modifiers will be less than 3%, while the average growth rate of other types will be 5%-6%. Since PVC is the largest used variety of impact modifiers, occupying about 80% of the volume, the increase in demand for PVC will also drive the demand for impact modifiers. Engineering plastic resins such as PC, polyamide (PA), polyester, etc. consume about 10% of impact modifiers. As the demand for engineering plastics is growing strongly, the consumption of impact modifiers is increasing. Polyolefin resin consumes about 10% of impact modifier. Experts pointed out that the development trend of impact modifiers in the future is better performance, cheaper price, faster action, improving the performance of the main material or making the components thinner under the premise of ensuring the performance. Among foreign companies, such as Arkema's Durastrength products can significantly improve the impact resistance of PVC. In addition, Compton, DuPont, Dow Chemical and other companies have launched their own suitable products.
2021 / 12 / 11
PVC dry blends and compounds are becoming increasingly popular as a result of their versatility and cost-effectiveness. Individually formulated NOVISTA additives are used especially for highly filled thermoplastic applications where common additives reach their limits. These products are particularly suited to inorganic pigments and fillers. This results in higher filling levels and a homogeneous distribution of fillers. These additives affect both the plastification process and the melting properties of the blends.NOVISTA processing additives also enhance the release properties of the material, thereby increasing the efficiency of the production processes.
2021 / 12 / 11
Flame retardants are a kind of auxiliaries that can prevent plastic from igniting or inhibit flame propagation. They are often used in modified enterprises to improve the flame retardant properties of plastics. According to the method of its use, it can be divided into two types: additive type and reactive type. The added type flame retardant is incorporated into plastic during the processing of plastic, and is mostly used for thermoplastics. The reactive flame retardant is chemically bonded to the polymer molecular chain as a monomer during polymer synthesis, and is mostly used for thermosetting plastics. Some reactive flame retardants can also be used as additive flame retardants. According to the chemical structure, the flame retardant can be further divided into inorganic and organic types. Among these compounds, halogen and phosphorus are contained, and some elements such as bismuth, boron and aluminum are contained. Today we focus on the flame retardant effect of flame retardants. Flame retardant effect of a barrier agent The flame retardant effect of a flame retardant is the speed at which physical or chemical changes can be prevented or inhibited during the combustion of the polymer material. Specifically, these effects are reflected in the following aspects. Endothermic effect Its function is to make the temperature rise of the polymer material difficult. For example, borax has 10 molecules of water of crystallization. Since the crystal water is released, 141.8 kJ/mol of heat is taken, and the temperature rise of the material is absorbed by the heat absorption. Suppressed, resulting in a flame retardant effect. The flame re
The importance of Halogen-free flame retardant
2021 / 12 / 11
Halogen-free is a phrase that many of us recognise. It is often used in connection with cable products, and is generally understood to be a good thing. But why is being free of halogens a good thing, and what are halogens in the first place? Halogen is the name used to describe a group of elements on the periodic table that exhibit similar properties. These elements are: Fluorine Chlorine Bromine Iodine Astatine Halogens are particularly useful elements in a wide variety of applications, from disinfectants to lighting. They are even essential for good health - with the exception of Astatine, the human body contains small amounts of all of the halogens. For the purposes of this article, their most useful application is a constituent compound used in electrical cables. One of the most popular cabling materials in use today is PVC (P
Study on Overall Effectiveness of Flame Retardants.
2021 / 12 / 11
There has been some confusion in the media about one particular study that evaluates the benefits of flame retardants- Fire Hazard Comparison of Fire-Retarded and Non-Fire-Retarded Products , V. Babrauskas et., al (1988). The U.S. Department of Commerce, National Bureau of Standards completed study, which was sponsored by the Flame Retardant Chemicals Association. The study was intended to measure the overall effectiveness of flame retardants, not any one fire standard. It does this objectively. Specifically, the study tests five product types: Polystyrene television cabinet Polyphenylene oxide business machine housing Polyurethane foam-padded upholstered chair Electrical cable with polyethylene wire insulation and rubber jacketing Polyester/glass electric circuit board. The study authors tested both the individual products as well as a simulated room that contained all of the products. In evaluating the simulated room, the following conclusions were stated: [For the FR [fire retardants] tests, the average available escape time was more than 15-fold greater than for the occupants of the NFR [non-fire retarded] room. With regard to the production of combustion products:
Heat stabilizer market ready for product changes-1
2021 / 12 / 07
PVC (polyvinylchloride) is a versatile polymer, either rigid or plasticized to yield a flexible plastic. It requires, however, a heat stabilizer. PVC is employed in many applications ranging from flooring, cable, and film made from plasticized vinyl to pipe, profiles, and sheets processed from rigid PVC. However, PVC can only be processed in the presence of heat-stabilizing additives to avoid changes in the chemical structure caused by elevated temperatures and mechanical stresses. Over the last decades lead (Pb) stabilizers were used to stabilize most rigid PVC worldwide except in North America, where tin (Sn) stabilizers dominated. Both systems show similar price/performance ratios; technically, they are incompatible with each other, cannot be recycled together, and thus are used exclusively in selective markets. Now a trend toward stabilizers based on calcium (Ca) and zinc (Zn) as well as organic compounds is emerging. Use of these additives is mainly driven by voluntary commitments, such as the Vinyl 2010 initiative by the European PVC industry, started by key PVC industry players in 2000. It is a 15-year-program to meet the challenges of sustainable development and continuous environmental improvement throughout the European PVC sector. Stabilizer systems based on calcium/zinc (CaZn) deliver some advantages over lead and tin stabilizers. They combine easy handling with good final product properties and excellent outdoor weathering performance. Like lead stabilizers, the are mostly offered as customized one packs. On the other hand, they are more product-specific, often requiring custom formulation for individual applications, when compared to lead-based stabilizer systems. The cost of CaZn stabilizers is now similar to lead stabilizers. To get the complete picture, prices should be compared based on a similar unit length of final product. At first glance CaZn is more expen
Heat stabilizer market ready for product changes-2
2021 / 12 / 07
The use of the different stabilizer systems differs not only from region to region, but also from application to application. Extruded PVC profiles are products with good physical properties that meet the most demanding economic and ecological requirements. Applications include window and door frames, shutters, cable ducting, siding, and gutters, to name a few. In the profile sector, lead stabilizers are still widely used because of their good processability, favorable cost/performance ratio, and outstanding heat stability. However, CaZn stabilizers now possess a considerable market share in Europe since they have evolved out of expensive stabilizers based on metal soaps and polyoles to more elaborate systems comprised of effective inorganic acid scavengers and organic costabilizers. In terms of processing properties, the tendency of CaZn stabilizers to plate-out in tools and calibration has been reduced to the same level as lead. When processed with suitable lubricant systems, CaZn-stabilized profiles compare favorably with lead-stabilized profiles in terms of processability and surface gloss. Weathering performance is a critical issue in stabilization of building profiles. Testing indicates CaZn stabilizers achieve a better color hold than traditional lead systems. This effect is particularly relevant for dark colored profiles where additional cost savings may be realized by lower colorant requirements due to the reduced whitening pigment effect of CaZn compared to lead. Liquid tin stabilizers used in the United States require a high dosage of titanium dioxide (TiO2) for sufficient weathering stability. Widely used solid lead stabilizers work with a much lower TiO2 level even under extreme weathering conditions. Looking to the future, modest changes away from tin stabilizers in the United States are expected, whereas lead systems in Europe will increasingly be replaced by CaZ
Heat stabilizer market ready for product changes-3
2021 / 12 / 07
At the moment, the PVC pipes and fittings sector is seeing the development of lead-free stabilizers based on calcium compounds. The core stabilizer comprises an inorganic acid scavenger, a calcium soap, and additional lubricants to achieve basic stabilization of compact pipes. To improve early color, color hold, and weatherability of the final product, either zinc compounds or organic costabilizers are added to yield calcium/zinc or calcium-organic systems, respectively. Fine adjustments in composition can be made to serve a variety of applications. Up to now, calcium/zinc stabilizers offer price advantages over their calcium-organic counterparts. Plasticized PVC has been used to produce cable and wire insulation and sheathing for more than 50 years. It is still enjoying a healthy market share. For technical reasons, lead was traditionally used worldwide as the main stabilizer in the cable sector. CaZn systems for PVC cables and wires have gained importance during the last few years and their demand is still growing. Today the different heat stabilizers for cables and wires compete with each other in terms of cost, performance, and processing properties. In addition, ecological considerations and statutory requirements have become increasingly important. The EU ELV (end-of-life vehicle) directive makes it difficult and expensive to recycle or dump lead-containing materials. Therefore, the automotive industry has moved toward CaZn. Meanwhile the majority of cables, especially for high-temperature applications, are stabilized with CaZn. In Europe, CaZn stabilizers already hold a larger market share than lead. They provide excellent electrical properties, very good color, outstanding heat stability, good heat aging properties, and are in some cases superior to lead. Lead and calcium/zinc PVC stabilizers are usually delivered as so-called one-packs, not only containing the heat stabilizers but al
2021 / 12 / 04
1. Less PVC internal lubrication and more PVC external lubrication It takes a long time to plasticize, the fluidity of molten materials is poor, the plasticizing torque is large, the mechanical properties of the products are decreased, the products become brittle, and the precipitation phenomenon may occur. In serious cases, the oil sample can be felt by hand 2. More PVC internal lubrication and less PVC external lubrication The plasticizing time is short, there is a heavy adhesion phenomenon, the surface gloss of the product is poor, and the thermal stability may become poor. If the total amount of lubricant is not enough, there will be adhesion and short plasticizing time; if the total amount of lubricant is too much, the mechanical properties will decline and precipitation may occur. If the amount of lubricant in PVC is insufficient, the plasticizing torque will be larger and the plasticizing time will be longer; if the amount of lubricant is excessive, the plasticizing time will be shorter, the plasticizing torque will be smaller, the thermal stability time will be shorter, there will be thermal decomposition phenomenon, and the inner wall of the product will not be smooth. 3. The lubrication balance can be judged by the plasticization of the material in the extruder The plasticizing time of the lubrication balance system on the torque rheological curve corresponds to the position of about 2 / 3 of the extruder, that is, the position where the plasticizing section of the extruder will end and the homogenizing section will begin. If it is not the lubrication balance system, the plasticizing time corresponding to the position of extruder will be changed. If the position of extruder corresponding to the plasticizing time is less than 2 / 3, the product will be over plasticized, which may cause thermal decomposition and yellowing of PVC-U; if the
Key points in the design of PVC formula lubrication system
2021 / 12 / 04
Key points in the design of PVC formula lubrication system 1. Complete lubrication system =PVC external lubricant +PVC external / internal lubricant + PVC internal lubricant 2. The simpler the composition of the lubrication system, the better. The more components, the more problems and side effects may occur 3. The amount of internal sliding agent is more than that of external sliding agent. 4. Adding internal sliding agent can improve physical properties and reduce precipitation to a certain extent Use ester and wax together to increase lubrication effect. It can reduce the amount of addition and precipitation at the same time
Basic Theory Of PVC Lubricants
2021 / 12 / 04
1. Interface chemistry theory The melt of PVC is regarded as a phase system, and the PVC external lubricant or internal / external lubricant is regarded as a surfactant. The performance and characteristics of lubricant in production are explained by the theory of interface chemistry. The non-polar PE wax, paraffin wax and other pure slip agents are regarded as non-polar substances at both ends. Products such as ester lubricants, oxidized polyethylene wax, etc., which have polarity at one end and non polarity at the other end, are regarded as surfactants. 2. Similar dissolving principle Two substances with similar structure or polarity (solute and solvent) can dissolve each other, which is an important principle of similar solubility in chemistry. In the theory of guiding the use of humectants, the principle of similar solubility is the most widely used. Regarding PVC melt as a solvent system, lubricant melt is solute. Similar solubility leads to the concept of solubility and saturation. Any substance has a certain solubility in another substance. If it exceeds the saturation of dissolution, it will not dissolve and precipitate. Similarly, the total amount of any substance of the same kind has a certain solubility in another substance. If the total amount exceeds the saturation, it will precipitate. When we design the formula, we focus on this guiding theory. As long as we meet the production and product performance, we try to reduce the total amount of all lubricants, including the total amount of the same kind of lubricants, so that we can effectively reduce or avoid precipitation. 3. Laminar slip model It is assumed that the motion behavior of the film formed between the melt surface and the metal surface by different types of PVC external lubricants conforms to the model theory of fluid laminar flow and
Flame retardant mechanism in textiles
2021 / 12 / 04
Flame-retardant textiles can be seen everywhere in our lives, and their applications cover many fields such as daily life, industry, agriculture, medical defense, aerospace, transportation, and military. So, do you know how flame-retardant textiles achieve flame-retardant effects? Flame retardant mechanism Most of the textiles in our daily life are made of chemical fibers, cellulose fibers or a variety of fiber blends. Under the condition of a heat source, the heat can cause the fiber material to crack and produce combustible substances. These decomposition products will continue to oxidize and burn in the flame, and release a lot of heat, which will promote the continuous cracking of the fiber material and accelerate the combustion. The conditions for fabric burning are combustible materials, combustion-supporting materials and fire sources. Only by analyzing the conditions and processes of combustion can different flame retardant mechanisms be adopted according to the combustion process. The flame-retardant finishing refers to the post-finishing of the fabric to reduce its flammability when exposed to an external heat source, delay the spread of combustion, and quickly extinguish the flame after removing the external heat source. For the combustion process of fabrics, flame retardancy is to cut off the circulation system of the interaction between the heat source, fabric and oxygen.
Major categories of flame retardants
2021 / 12 / 04
From mattresses to televisions, children`s toys to carpet padding, we are surrounded by products that contain flame retardants. These chemicals are added to materials or products to prevent or slow the spread of fire. They are broken down into the following 5 major categories: 1. Halogen: Within this class of flame retardants includes chlorine-based systems but perhaps the most well-known are Bromine Flame Retardants (BRFs). BFRs are commonly used by those within the electronics industry and also within textiles, construction products, and coatings. Bromine is used because it releases active bromine atoms into the gas phase before the material reaches its ignition temperature, which quenches the chemical reactions occurring within the flame. This can prevent the burning process from occurring or can slow it such that other measures can be taken to extinguish the fire. This is an example of the vapor phase inhibition approach. One major issue with this type of flame retardant is they are becoming increasingly banned within products due to safety concerns. The RoHS directive, for example, specifically limits the amount of polybrominated biphenyls and polybrominated diphenyl ethers that can be found within appliances, IT equipment, lighting equipment, medical devices, toys, and semiconductors, amongst other product categories. 2. Inorganic Flame Retardants: Many inorganic compounds are used as flame retardants or a catalyst within a flame retardant system. When it comes to flame retardants these materials often have to be used in large concentrations to achieve desired re
How Flame Retardants Are Used in Transportation
2021 / 12 / 04
A wide variety of plastics, textiles and composite materials are used extensively in the mechanical, structural and decorative parts of today`s transport, including airplanes, trains and cars. These materials are: (i) highly adaptable to new designs; (ii) lighter weight, making them more energy efficient; (iii) less labor intensive; and (iv) more cost effective. Flame retardants are often used to ensure these materials can meet flammability standards. To make materials fire-resistant, flame retardants act to help stop or slow the spread of fire. They can be used alone, or in combination with other flame retardants that act as synergists to enhance fire retardant properties. If a fire does start, flame retardant solutions work in different ways to help stop or minimize its effects. Learn more about how flame retardants work. Different classes of flame retardants work to reduce the threat of fire hazards in different ways, and must be matched to the specific material being used and the performance specifications of the final product. There is no one-size-fits-all solution when essential fire-protection benefits must be balanced with ensuring optimal performance. Today, travel is safer than ever before, regardless of the mode of transportation. Thousands of people take to the highways, railways and air daily, and they do so with the expectation of reaching their destinations safely. Flame retardants play
The Plastic Profile Extrusion Process Explained-3
2021 / 12 / 03
Products Plastic extrusion is about using molten plastic to produce different shapes. The process can be used for industrial purposes or domestic uses. The technology can produce various products such as plastic films, medical packaging, hose mandrels, wire insulations, tubes and rods. Electrical equipment Extrusion is used in Electrical Products like the insulation of electrical wires. During this process, insulation is extruded around the wire when it`s pulled through the die. The wire must possess features such as abrasive resistance and strong electrical insulation capabilities. Insulation helps in preventing electric shocks and corrosion. Profile shapes The primary process used in the production of long cross-section shapes is extrusion. Most new homes today have vinyl slidings, developed using this procedure. The production of other profile shapes such as rain gutters and windshield wipers also uses the process. Polycarbonate sheeting Extrusion is used in the production of the impact-resistant glass replacement. Window glazing and machine guards can be made from polycarbonate sheeting. The sheeting comes in different thicknesses, depending on the purpose. Solid shapes Extrusion can produce solids in different shapes such as round, square or rectangular, and different lengths. Recycled plastics are ideal in the production of plastic decking and lumber. Extracted plastics are commonly used in fencing and outdoor furniture, such as benches. They`re better than timber because they`re weather-proof, splinter-proof and durable. You don`t have to worry about maintenance when you use these plastic pieces. Pipes Water and sewerage systems rely on extruded pipes in the form of PVC. The pipes come in different diameters depending on the need. For instance, the sewer pipes can be several inches wide, while others like taps have much smalle
The Plastic Profile Extrusion Process Explained-1
2021 / 12 / 03
Plastics are a popular raw material used in making a wide array of products, ranging from tubing to Energy-Efficient Vinyl Window Frames. The plastic profile extrusion process is a common procedure in the plastic-making sector because it`s readily available and easy to deploy. Many companies prefer handling plastics to other materials because petroleum-based products are easy to model. Read on to learn more about the profile extrusion process. Understanding Plastic Extrusion The plastic extrusion process is a straightforward procedure that involves melting down resin beads (raw thermostat material), filtering it and then designing it into a given shape. The rotating screw helps in pushing down a heated barrel to a given temperature. The molten plastic is passed through a die to give the final product its shape or profile. Filtering provides the final product with uniform consistency. Here`s a quick breakdown of the entire process. Step 1: The process begins by introducing raw plastic products such as granules and pellets into a hopper and feeding into an extruder. Colorants or additives are added if the raw materials don`t have some. A revolving screw facilitates the movement of raw resin through the heated cylindrical chamber. Step 2: The hopper`s raw materials then flow through the feed throat to a sizeable spinning screw within a horizontal barrel. Step 3: Different materials have different properties, including melting temperatures. As the raw resin passes through the heated chamber, it`s heated to its specific melting temperatures, ranging from 400 to 530 degrees Fahrenheit. The resin is thoroughly mixed by the time it gets to the end of the screw. (To be continued...)
The Plastic Profile Extrusion Process Explained-2
2021 / 12 / 03
Step 4: Before the resin is passed through a die to create the end product`s shape, it passes through a screen reinforced by a breaker plate. The screen removes the contaminants or inconsistencies that may be in the melted plastic. The resin is now ready to die as it`s fed into the cavity for cooling and hardening. Water bath or cooling rolls can help in fastening the cooling process. Step 5: The plastic profile extrusion process should be in such a way that the resin flows smoothly and evenly in the numerous stages. The quality of the final product depends on the consistency of the entire process. Raw Materials Used in Plastic Extrusion Process Different plastic raw materials can be heated and created into a continuous profile. Companies use a wide range of raw materials, including polycarbonate, PVC, recycled materials, nylon and polypropylene (PP). Temperature Maintenance Temperature plays an essential role in the entire extrusion process. Maintenance of the optimal temperatures is necessary to produce quality products. Failure to maintain the right temperature may minimize the uniform fluidity of the resin. There`s also the risk of the final product warping. You can tell if the temperatures are not constant when pressure, friction and other variables start to develop in the extruder. It`s essential to keep an eye on the heater to ensure no increase or drop in temperature. You can manage the heat within the extruder by lowering, raising or shutting off the heaters appropriately. Screw Design The screw plays a crucial role in the plastic profile extrusion process as it facilitates resin movement in different stages. There`s no other moving part in the system. You should consider the design of this device as it determines t
2021 / 11 / 27
As a general flame-retardant material, flame-retardant abs material has a wide range of applications, including: electronic and electrical enclosures, instrumentation, auto parts, switch panels, sockets, etc. The ABS material itself is a non-flame-retardant plastic. It is necessary to add modifiers, including flame retardants and other flame-retardant materials, to make the ABS material reach the flame-retardant V0 or even 5VA level. The oxygen index of ABS resin is between 18.8% and 20.2%. It is a flammable material and emits a large amount of toxic gas and black smoke. Here are several modification methods to improve the flame retardant properties of ABS resin: Add small molecule flame retardants, which include organic and inorganic flame retardants. Organic flame retardants include halogen compounds, phosphorus and nitrogen flame retardant compounds, etc., and inorganic flame retardants include aluminum hydroxide, magnesium hydroxide and two oxides. Antimony etc. 1. Halogen compounds are added to ABS resin as flame retardants. The main mechanism of this modification method is: when burning, the flame retardant decomposes into halogen-containing gas, such as HCL, etc. The gas is on the one hand the chain of active free radicals. The formula reaction, on the other hand, isolates the oxygen in the air, so as to achi
What types of products use flame retardants?
2021 / 11 / 27
While an ever-evolving list of new products-from hair dryers and small appliances to laptops and flat-screen televisions-is incorporated into our homes, offices and commercial environments, we seldom think about how the products are made. Flame retardants provide consumers with a critical layer of fire protection and are vital to reducing the risks associated with fire. Today, flame retardants are used predominantly in four major areas: Electronics and Electrical Devices Television and other electronic device casings Computers and laptops, including monitors, keyboards and portable digital devices Telephones and cell phones Refrigerators Washers and dryers Vacuum cleaners Electronic circuit boards Electrical and optical wires and cables Small household appliances
Advantages of flame retardant masterbatch
2021 / 11 / 27
Because of the flame retardant efficiency, environmental protection, efficiency, convenience and so on, the flame retardant masterbatch has become an effective substitute for the traditional flame retardant and has been widely used in the various aspects of plastic granulation, extrusion, injection molding and other aspects. The effective flame retardant masterbatch is also known as the flame retardant masterbatch for modified plastics plant. The following advantages of using functional flame retardant masterbatch in modification plant. 1. Reduce cost With the progress of science and technology, the continuous development of carrier plastics and equipment, high concentration, high dispersion and high compatibility are possible. A small amount of carrier is no longer the main cause affecting the flame retardancy. Thus, the ideal condition of the exchange of flame retardant and powdery flame retardant is realized, and the flame retardant effect is not constant, and the flame retardancy efficiency is improved. Together with the organic combination of the fire-retardant masterbatch, the cost is reduced by the collective purchase, and the cost advantage of the flame retardant masterbatch is guaranteed, so that the cost can be effectively reduced after the customer is used. 2. improve efficiency
2021 / 11 / 26
Profile extrusion is a process by which various plastic materials are used to develop quality plastic products. These products have a continuous cross-section such as pipe, drinking straws, decorative molding, eavestroughing, window trimming and many others. The basic procedure of profile extrusion is that the polymer is melted into a hollow mold cavity, under the influence of high pressure. Process of Profile Extrusion A wide range of special profile extrusion equipment are used to carry out this process effectively. In this process, first the plastic (pellet form) is fed into the machine hopper / extruder. Along with this, the material is constantly conveyed in the forward direction by the way of rotating screw which is placed inside the heated barrel that is being regularly softened by friction as well as heat. Then, the softened plastic is thrown out via a die, straight in the cool water that solidifies the product. From this point, it is conveyed to take-off rollers that actually pull the softened plastic from the die. The die is basically a metal plate which is placed at the extruders' end with a section that is cut out of its interior. This cutout along with the speed of take-off rollers are the two major factors that determine the final cross-section of manufact
2021 / 11 / 26
Profile extrusion is the process of making continuous shapes of plastic (not including sheet and film) by extrusion. Molten polymer is forced through a metal die cut into the linear shape of the desired finished article (channel, tube, etc.). The molten polymer exits the die and is drawn to the appropriate thickness in air. The article is then cooled and shaped by a forming/sizing collar in a water bath under vacuum. Cooling Use chilled water to allow efficient cooling during sizing and quenching while minimizing profile agitation. Use a cooling tank length so that the finished profile does not shrink or distort prior to pullout and cutting. Use sufficient vacuum in the vacuum box to achieve proper profile dimensioning. It should be kept low enough to prevent dragging on the sizing sleeve to eliminate chatter marks. Finishing Close control will need to be maintained on the cutting or sawing of the profile into the desired finished length to prevent splitting or shattering. A combination of part reheating and cutter-blade lubrication can significantly improve cut quality. Reheating the part can be accomplished by heated air or water. Use a reheat temperat
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