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Analysis and solution of common problems in blowing film (2 (injection molding products)
2, the film transparency is poor Reason 1: Low extrusion temperature, poor plasticization of resin, resulting in poor transparency of the film after blowing; Reason 2: blow ratio is too small; Reason 3: The cooling effect is not good, which affects the transparency of the film; Reason 4: The moisture content in the resin raw material is too large; Reason 5: The traction speed is too fast and the film is not cooled enough. solution ① Appropriately increase the extrusion temperature, so that the re
Analysis and solution of common problems in blowing film (1 (injection molding products)
As a blown film manufacturer, it is a common phenomenon to replace the film formula and produce different specifications of film, and in this process, various emergencies and on-site blowing film for various reasons lead to quality problems. By collecting the most common faults and causes in the process of blowing film, Xiaobian provides reference for enterprises and technical personnel, so as to solve the problem and solve the production problem. 1, the film is too sticky, poor opening Reason 1: The resin raw material model is not correct, not low-density polyeth
How to solve the weld marks of injection molding products?
How to solve the weld marks of injection molding products? In the injection molding process of plastic products, it is found that when the plastic melt fills the cavity, if the front part of the two or more melts have cooled when they meet, so that they can not be fully fused, they will produce grooves at the intersection and form a weld mark. Causes of welding marks of plastic products: 1, the plastic melt through the gate at high speed directly into the cavity, and then contact the surface of the cavity and cure, and then be pushed by the
How to solve the internal stress problem of PC plastic products
First, the cause of internal stress of PC plastic products 1. The internal stress of PC products is mainly caused by orientation stress and temperature stress, and sometimes is also affected by improper demoulding; 2. The thickness of the product also has an effect on the internal stress, and the orientation stress decreases with the increase of the thickness of the product; 3. Temperature stress plastic in the injection molding melt temperature and mold temperature between the large temperature difference, which makes the melt near the mold
Introduction of additives for biodegradable plastic products (6)
plasticizer (1) citrate ester plasticizer Citric acid ester plasticizer is synthesized from citric acid as the main raw material. The main foreign industrialized varieties are: tributyl citrate, trioctyl citrate, acetyl-tributyl citrate, acetyl-tributyl citrate, acetyl-tributyl citrate, and so on. Among them, triethyl citrate, tributyl citrate and acetylated citrate products have been approved by the United States FDA as non-toxic plasticizers. (2) polyethers such as polyethylene glycol (PEG) Polyether ester plasticizers such as polyethylene glycol (PEG) and polypro
Introduction of additives for biodegradable plastic products (5)
Acrylic ester (ACR) melt enhancer Biobased and biodegradable plastics generally have high brittleness and poor melt strength, and there are many shortcomings in film blowing and foaming processing. At present, the application of acrylic ester melt enhancers is an effective measure to increase and improve the strength of bio-based and biodegradable plastics melt. ACR melt enhancers were first researched and developed in the 1970s by Rohm and Haas of the United States and Mitsubishi Rayon Corporation of Japan. After entering the 21st century, Dow Chem, Arkema and other enterprises
Introduction of additives for biodegradable plastic products
Organic compounds Organic nucleating agents have the advantages of small dosage, quick effect and good compatibility, and have become a research hotspot in recent years. The relatively mature categories at home and abroad are mainly concentrated in the two categories of hydrazine and amide, the main manufacturers are Nissan Chemical, Shanxi Chemical Research Institute and so on. (1) hydrazides Hydrazides are compounds containing R1 -- CONHNH -- R2 groups formed by the reaction of carboxylic acids and their derivatives with hydrazine or alkyl substituted hydrazine. At prese
High light injection molding technology for plastic products
With the improvement of living standards, people have higher and higher requirements for the appearance of goods. The appearance of many electronic products has become an important standard for consumers to choose goods. How to produce no fusion marks, no flow marks, no flow lines, no shrinkage marks, surface high-light shell products, for flat panel TV, computer LCD display, air conditioning, automotive interior parts is particularly important. The use of high light injection molding technology can be a good solution to this problem. 01 The process princip
What is the screw length to diameter ratio? How to choose the length to diameter ratio?
1 What is the screw length to diameter ratio? The length of the working part of the screw (the length of the threaded part, also refers to the length of the center line of the feeding port to the end of the screw thread) and the ratio of the screw diameter is called the length-diameter ratio, when other conditions are certain (such as the diameter of the screw), increasing the length-diameter ratio means increasing the length of the screw. Large length-diameter ratio and reasonable temperature distribution are conducive to the mixing and plasticization of plastics
Plastic product injection molding process setting
The injection molding process setting should consider the shrinkage rate, fluidity, crystallization, heat sensitive plastics and easily hydrolyzed plastics, stress cracking and melt cracking, thermal properties and cooling rate, hygroscopic properties and other factors. NO.1 Percentage of contraction The form and calculation of thermoplastic molding shrinkage As mentioned earlier, the factors that affect the molding shrinkage of thermoplastics are as follows: 1.1 Plastic varieties Due to the volume change from crystallization, strong i
Modification of plastic products
1, PET filling modification Filling modification is one of the most direct and effective ways to improve the properties of materials by using inorganic components that are completely different from polymer matrix properties. 2. PET modified by nanoparticles At present, the research of PET composites modified by nanoparticles has been very mature. Ke et al. modified PET with layered clay and obtained PET/clay nanocomposites by intercalation polymerization. The results show that when the clay content is 5wt %, the thermal deformation temperature of the composite is a
Calcium content Calcium content is an important quality technical index of calcium carbonate. The modified masterbatch requires higher calcium content of calcium carbonate, generally more than 98%. The higher the calcium content, the more stable the processing property of calcium carbonate. When the calcium content is low, it will increase the content of impurities such as heavy metals and other non-metals, which will not only affect the use of calcium carbonate, but also affect the processing technology, affecting the quality of products or causing harm to processing equipment.
Introduction of additives for biodegradable plastics
Auxiliaries for biodegradable plastics are important associated industries for biodegradable plastics. In the face of the rapid development of biodegradable plastics production and demand in recent years, as a supporting agent for biodegradable plastics is facing unprecedented opportunities and challenges. First, polylactic acid and other crystalline polyester supporting nucleating agents As we all know, the crystallization behavior of crystalline polymers, including crystal form, crystallinity, crystallization rate, etc., directly determines the performance of the produc
Plastic product surface treatment
With the continuous improvement of plastic processing and modification technology, the application field has expanded rapidly. Different application fields have increasing requirements for plastic surface decoration, material protection, improving bonding and other properties, but various plastic structures and components are different, and the corresponding surface properties are also significantly different. A variety of surface treatment technologies and products for different applications have emerged. To meet the different needs of plastic surface treatment, a variety of tr
Introduction of additives for biodegradable plastic products (4)
Reactive functional polymer chain extender Because PLA, polyhydroxyfatty acid ester (PHA), poly (butylene adipate/butylene terephthalate) (PBAT), polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and other biodegradable polymers contain rich carboxyl, hydroxyl and other reactive functional groups, Therefore, thermal degradation will inevitably occur in processing and application, which will lead to the reduction of melt strength and mechanical properties of products. Therefore, the development and application of reactive functional polymer chain extender is an im
01 Universal thermoplastic reinforced formula Formula 1 (High performance glass fiber reinforced PP) : Homopolymer PP (F401) 54% GF 30% Coupling agent K-550 0.5% PP-g-MAH 5% POE-g-MAH 10% Lubricant 0.5% Processing conditions: (1) extrusion granulation temperature 180~230°C; Screw speed 320r/min (2) Injection molding temperature 190~210°C Formula 2 (GF/ liquid crystal composite enhanced PP) : PP 70% TLCP 50% GF 3% Note: GF length < 4mm, copolyester treated
cnc machining process The analysis and research of parts drawings is mainly to conduct process review on parts, such as checking the view, size, technical requirements, errors and omissions of design drawings, especially for parts with poor structure and technology, if possible, design. Personnel communicate or propose amendments, and the designer decides whether to make necessary amendments and improvements. Analyze part drawings for completene
PTFE product blending, filling modification method
The composition and structural characteristics of PTFE determine that it has the characteristics of high and low temperature resistance, corrosion resistance, weather resistance, high lubrication, non-adhesion, etc., but there are also low hardness, large coefficient of linear expansion, poor thermal conductivity, poor mechanical properties, poor wear resistance, poor creep resistance, easy cold flow, secondary processing difficulties and other shortcomings, to a certain extent, limiting its wide application. Therefore, the research on its modification has been a hot topic.
Ethylene-1-octene random copolymer (POE)
Ethylene-1-octene random copolymer (POE) POE is a polyolefin elastomer with low density, excellent physical properties, chemical corrosion resistance, gas permeability and electrical properties, which was first developed by DowDuPont (DWDP) using metallocene catalyst. The content of copolymer 1-octene in typical POE is more than 20%. Compared with traditional polymers, its molecular weight distribution and copolymer distribution are narrow, short branch chain distribution is uniform, so it has excellent physical and mechanical properties (high elasticity, high str
Plastic products granulation processing five common problems and countermeasures
Dark spot ★ Poor quality of raw materials, more black spots; ★ Local overheating or shearing of the screw is too strong, resulting in increased carbonization of the material; ★ The head pressure is too large, the reflux material is too much, and the carbonization of the material is aggravated; ★ The service life of the machine is too long, the gap between the screw and the cylinder increases, and the adhesion of the cylinder wall increases; ★ Natural exhaust port and vacuum exhaust port are not cleaned for a long time, and the accumulation o
Types and application fields of thermoplastic elastomers
Elastomers can be divided into thermosetting elastomers and thermoplastic elastomers according to whether they are plasticized. Thermosetting elastomer is the traditional meaning of rubber, thermoplastic elastomer (TPE) in the 1990s began to gradually be more and more commercial applications. This type of elastomer is processed in two different ways: rubber is processed with thermosetting equipment, and TPE is processed with thermoplastic equipment. TPE is defined as a polymer material that shows rubber elasticity at room temperature and can be plasticized at high temperatures.
How to improve the scratch resistance and wear resistance of plastic products
1 Select the right matrix resin Usually ultra-high molecular weight polyethylene (PE-UHWM) is one of the most wear-resistant plastics, and the selection of PE-U·HWM can simply improve the wear resistance of the material. In addition, high crystallization, high regularity of the plastic is more wear-resistant, high hardness of the plastic is more wear-resistant, such as polystyrene composed of large molecules such as benzene rings do not wear. In polypropylene (PP) modification, polyolefin elastomer (POE), ethylene propylene terene rubber (EPDM), thermoplastic dynamic vul
PPSU product performance and use
# 1 Basic property PPSU is a linear polymer with a slight amber color. In addition to strong polar solvents, concentrated nitric acid and sulfuric acid, it is stable to general acids, bases, salts, alcohols, aliphatic hydrocarbons, etc. Partially soluble in ester ketone aromatics, soluble in halocarbon. Good rigidity and toughness, high temperature resistance, heat oxidation resistance, excellent creep resistance, corrosion resistance to inorganic acid, alkali, salt solution, ion radiation resistance, non-toxic, insulation and self-extinguishing good, easy mol
Nylon products in the application of life
Nylon products in the application of life Nylon is a synthetic fiber with excellent strength, wear, heat and chemical resistance. Therefore, nylon has a wide range of applications in life, including but not limited to the following aspects: 1. Textile: Nylon fiber can be used to make a variety of clothing, socks, underwear and so on. It has the characteristics of soft, breathable, good moisture absorption, etc., and is often used in outdoor s
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