Ultrasonic spinning machine, ultrasonic/plastic welding machine/non-woven welding
Ultrasonic welding application method 1. Welding method: Under moderate pressure, the welding head vibrating with ultrasonic waves generates frictional heat on the joint surface of two pieces of plastic, instantly melting the joint. The welding strength is comparable to that of the body. Suitable workpiece and reasonable interface design can achieve water-tight. and gas tightness and avoid the inconvenience caused by using auxiliary products for efficient and clean welding. 2. Riveting and...
Eight ways to reduce injection molding costs
The eight ways to reduce the cost of injection molding are as follows: First, the production workshop The layout of the production workshop needs to be considered from two aspects: under the conditions of production demand, the optimized layout according to the production process, while meeting the requirements of flexible energy consumption under specific production conditions. 1. The power supply has an appropriate margin while meeting the power required for stable production, so that the...
Characteristics and processing of 20 injection molding materials
The characteristics and processing techniques of the 20 injection molding materials are as follows: PVC (polyvinyl chloride) Typical applications: water supply pipes, household pipes, house wall panels, commercial machine casings, electronic product packaging, medical equipment, food packaging, etc. Injection Molding Process Conditions: Drying: Drying is usually not required. Melting temperature: 185~205C. Mold temperature: 20~50C Injection pressure: can be as large as 1500bar holding pressure:...
Causes and solutions of mold scale after injection molding of engineering plastics
1, the formation of mold scale Almost all thermoplastic injection molding are mold deposit occurs. When the functional requirements of the final product must be incorporated into the relevant additives (eg, modifiers, fire retardants, etc.), these additives are likely to remain on the surface of the cavity during the molding process, resulting in the formation of mold scale. There are other reasons for the formation of mold scale. The most common reasons are as follows: a. thermal decomposition...
Long glass fibre reinforced polypropylene (PP) injection molding
In automotive engineering, the use of long glass fiber-reinforced polypropylene is increasingly used in dashboards, car front and bottom parts. Because of its low density, low price, and the advantages of recyclability, polypropylene is gradually replacing engineering plastics and metals in these applications. However, when long glass fiber-reinforced polypropylene increases the elastic modulus and impact resistance of the material, the polypropylene material merely satisfies the mechanical...
What is Reaction Injection Molding (RIM)
Reaction Injection Molding (RIM) mixes the reactant liquid intermediates as they enter the mold to create a part. Unlike conventional injection molding, reactive injection molding forms solid components by cross-linking or polymerizing in a mold rather than by cooling. This process does not require the use of a hot mold cavity to activate the reaction. In fact, heat is generated when the intermediate is mixed under heat, so the RIM mold usually needs to be cooled. The demolding time of the...
Features of insert injection molding technology
Insert molding refers to a molding method in which a resin is injected into a mold and a resin is injected into a mold, and the molten material is bonded to the insert to form an integrated product. Out-sert molding refers to a method of inserting an injection molded part on a part of a metal plate surface. The above two molding methods are essentially the same. Its characteristics are as follows: 1. The combination of the moldability and flexibility of the resin and the rigidity, strength and...
PVC injection molding process: eight steps to get it all done
The PVC material is a non-crystalline material. PVC materials are often added with stabilizers, lubricants, auxiliary processing agents, colorants, impact agents and other additives in actual use. PVC materials are non-flammable, high strength, weather resistant and excellent geometric stability. Polyvinyl chloride (PVC) has poor thermal stability, the molding temperature is close to the decomposition temperature, the fluidity is not good, the appearance is easy to form poor defects, the heat...
Solutions to prevent oil contamination during the processing and production of injection molded products
After the injection molded parts are ejected, they are often contaminated by oil (the grease is usually dripped from the brackets, formwork bushings and hydraulic cylinder seals). In this case, repairs should be made immediately, and preventive and maintenance measures should be taken to control the leakage of grease. (At present, all-electric injection molding machines can also produce plastic parts in a clean room environment.) One of the main causes of grease contamination is the leakage of...
Application examples for pressure sensor injection molds
The pressure sensor can be installed in the injection molding machine nozzle, hot runner system, cold runner system and mold cavity, it can measure the plastic injection molding machine, filling mold, pressure and cooling process from the injection molding machine nozzle to Plastic pressure somewhere between the mold cavities. This data can be recorded in a monitoring system for real-time adjustment of the molding pressure and checked after molding or to eliminate failures in the production...
Injection molding processes and applications of AS plastics
What is aS plastic? The scientific name of aS resin is acrylonitrile-styrene copolymer. A polymer compound obtained by copolymerizing acrylonitrile and styrene. It generally contains 15%-50% styrene. A solid, yellowish to amber needle solid. The density is 1.06. There is thermoplasticity. Not easy to change color. Not affected by dilute acid, dilute alkali, dilute alcohol and gasoline. However, it is soluble in acetone, ethyl acetate, dichloroethylene or the like. Can be used as engineering...
Analysis of the four advantages and three disadvantages of the injection molding process
Hollow plastic products produced by injection molding process have the following advantages compared with hollow plastic products produced by extrusion process. 1 Plastic bottles are molded from raw materials to finished products with a high degree of automation. They do not require manual secondary processing, save labor, and are hygienic and meet the GMP requirements for pharmaceutical packaging. They are especially suitable for producing pharmaceutical bottles. 2 The products have beautiful...
Common problems during injection moulding and their solutions
Molding defects and anomalies are ultimately reflected in the quality of the injection molded product. The shortcomings of injection molding products can be divided into the following points: (1) insufficient product injection; (2) Product overflow; (3) product dents and bubbles; (4) The product has a seam; (5) The product is brittle; (6) plastic discoloration; (7) The product has silver wire, markings and flow marks; (8) The product is turbid at the gate; (9) product warpage and shrinkage;...
Methods of controlling mold temperature during injection molding
The temperature of the injection mold has a great influence on the filling flow, curing setting, production efficiency and shape and dimensional accuracy of the plastic melt. Each plastic injection molding has a reasonable mold temperature area, so that the fluidity of the melt is easy to fill the cavity, the shrinkage and warpage of the plastic parts after demolding are small, the size is stable, and the mechanical properties and surface quality are also high. In order to control the...
Six factors affecting products in injection molding processes
1. Close the mold pressure: in principle, it should be greater than the total pressure of the plastic injection mold, based on the absence of burrs. 2. Pressure and speed have some of the same relationship acting in the mold. The purpose is to make the raw materials into the mold evenly, thoroughly and properly filled in all corners. Too low will cause short shots, shrinkage, too high hair, too full, sticking, burning, vulnerable molds and high internal stress 3, speed: the speed of the speed...
Introduction to the transparent material PMMA and the injection molding process
Because of its light weight, good toughness and easy molding. Low cost and other advantages, so in the modern industry and daily products, more and more plastics instead of glass, especially in the optical instrument and packaging industry, the development is particularly rapid. However, due to the requirement for transparency, the wear resistance is high, and the impact toughness is better, so the composition of the plastic, the process of the injection molding process, equipment. Molds, etc.,...
A brief introduction to the 3-D injection molding simulation system
I. Development overview and application background The plastics industry has developed rapidly in the past 20 years. As early as 7 years ago, the annual output of plastics has exceeded the total annual output of steel and non-ferrous metals by volume. Plastic products are in the pillar industries of the automobile, electromechanical, instrument, aerospace and other countries and the people. It has been widely used in various fields related to daily life. Although there are many methods for...
Approaches to warpage in plastic injection molding
Crystalline engineering plastics such as POM, Pa, PBT, and PET tend to be much more warped than non-crystalline ones, and improvements should be considered when designing molds and forming. If this is not done, it will be almost impossible to correct in the subsequent injection molding stage. 1. What is the main reason for warping? The shrinkage of crystalline engineering plastics is relatively high and is affected by many factors. Such as demoulding too fast, mold temperature is too high, mold...
About 3D printing based conformal cooling injection moulds
For mold manufacturers, because the quality of the mold directly determines the injection molding production efficiency, and determines the product quality, which determines the added value of the product, so how to efficiently cool the plastic products in the minimum cycle time, become a conformal cooling injection mold design With the key considerations in the manufacturing process, cooling plays an important role during this period. First, with the form of cooling from the constraints of the...
Possible causes of defective products in the injection molding process
1, difficult to discharge the gate In the injection molding process, the gate is stuck in the sprue bushing and it is not easy to escape. When the mold is opened, the product is cracked. In addition, the operator must use the tip of the copper rod to knock out from the nozzle, make it loose and release it, which will seriously affect the production efficiency. The main reason for this failure is the poor finish of the tapered hole in the gate, and the tool hole in the circumferential direction...
A brief analysis of PBT plastic properties and injection molding process conditions
Many people may not know what PBT is. PBT is a semi-crystalline material and it is one of the toughest engineering thermoplastics. Its internal molecular structure is very stable, has very good mechanical strength, electrical insulation properties and thermal stability, and is often used to make household appliances, electrical components, automotive parts, etc., and is widely used. Here is a brief introduction to what PBT materials, PBT plastic prices and PBT characteristics and applications....
Injection mold design for bottle caps
Because plastic caps have the characteristics of strong plasticity, low density, high specific strength, high bonding strength, high chemical stability, and diverse appearance, they are loved by more and more manufacturers and people. Demand for plastic cap molding parts is increasing, and quality requirements are getting higher and higher. This requires the development of molds for plastic parts, and the level of design and manufacturing must also be higher. Known volume V plastic or quality W...
Solutions when plastic molds or injection molds are trapped
Occasionally there are problems with trapped air in making plastic molds or injection molds? Can use breathable steel, alias: Japan breathable steel, Xindong breathable steel, breathable steel, SINTO breathable steel, Japan SINTO breathable steel, PM35 breathable steel, PM-35 breathable steel, Japan PM-35 breathable steel, powder sintered breathable steel, PORCERAX breathable steel, PORCERAX II breathable steel, breathable die steel, porous die steel, mold breathable steel, imported breathable...
Six aspects of the injection molding process that need attention to avoid problematic products
First, liquidity Good fluidity: Pa, PE, PS, PP, Ca, Medium fluidity: polystyrene series resin, PMMa, POM, polyphenylene ether; Poor fluidity: PC, hard PVC, polyphenylene ether, polysulfone, polyarylsulfone, fluoroplastic. The fluidity of various plastics also varies with each molding factor. The main factors affecting are as follows: 1. When the temperature of the material is high, the fluidity increases, but different plastics also have differentities. The fluidity of PS, PP, Pa, PMMa,...
