Advantages and disadvantages of injection molding Injection molding: also known as injection molding, this method of injection and molding. There are many advantages of injection molding, and the general summary is fast production speed, high efficiency, automatic operation, variety of design, simple shape, small size, accurate product size, convenient product update, complex shape and so on. And suitable for mass production and complex shape products and other molding injection processing fields. Factors affecting the quality of injection molding 1. Injection pressure: the reason for the need for injection pressure is to offset the resistance in the process of melt flow, or the resistance in the flow process to eliminate the pressure of the injection machine, the two are just the opposite, in order to ensure the smooth progress
Read more →1.Check how the machinery works Before starting, the injection molding machine and auxiliary machine must be inspected to ensure that the equipment is in normal condition (according to the requirements of L1 equipment operation records). If any problems are found, the maintenance personnel should be notified in time. 2.Power supply for injection molding machine Turn on the power supply of the injection molding machine, the mold temperature of the mechanical and electrical source, the general mold temperature is set to 80℃, the drying mechanical and electrical source (raw materials need to be dried at 80℃ for 4 hours), the cold water mechanical and electrical source, the exhaust fan and other power supply, turn on the injection molding machine oil pump motor screw and begin to heat up. 3.Grease
Read more →Injection molding machine is a special equipment which combines the hot working characteristics of plastics with the principle of melting die casting of metals. The original plunger injection molding machine was not developed until the late 1940s until the preplasticized screw injection molding machine. Since then, the focus of development is mainly around the pre-plasticized screw injection molding machine, has since appeared twin screw, exhaust and other advanced forms. In 1980, France produced the world’s largest screw injection molding machine, with an injection capacity of 170kg. From the 1980s to recent years, the development of injection molding machine is mainly concentrated in several aspects: namely, the application of precision automatic control system and various auxiliary equipment in automatic molding; Precision machinery and high performance hydraulic system; Various special
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Why we need to set mold protection to prevent damage? Beside the injection molding machine itself, the second most expensive piece of equipment we use on a daily basis is the mold. If the molds are damaged, you are not only responsible for the cost of maintenance, but also for downtime and labor costs.If done correctly, the mold can rest on something as thin as a business card. Here are three key components for setting up mold protection on injection molding machines: 1. Starting position of mold protection When do you reach the point in the mold where you might break when the mold is closed? In the figure above, this point is when the mold touches the guide pin. This is where we
Read more →Plastic injection mould is generally composed of forming parts, pouring system, guiding part, pushing mechanism, temperature control system, exhaust system, supporting parts, side parting and core pulling mechanism. Simple description of each part of the injection mold Figure 1-1 Basic structure of the plastic injection mold 1. The forming parts refer to the parts related to the forming cavity of the moving and fixing parts. 2. The pouring system is to melt the plastic 3. Guide part in the injection mold, the guide part is used to guide the dynamic and fixed mold of the mold, so that the mold can be accurately matched when the mold is closed. 4. Push out mechanism refers to the device that pushes out the plastic parts from the mold after parting.
Read more →In the existing injection molding industry are faced with: Raw material increase Labor costs have skyrocketed Difficulty in recruiting staff Large turnover of personnel Product price decline The problem of increasingly fierce competition in the industry. I njection molding industry has entered the era of transformation, small profit and reshuffle, injection molding workshop management needs to establish a “scientific, perfect, systematic, standardized” operation management system, so that “everything is managed, everyone is in charge” of the working atmosphere of the department, for the injection molding workshop each post work efficiency improvement, manpower reduction has the following measures and suggestions: First, the upper and lower mold workers to improve work efficiency, reduce manpower measures 1. Do a good job in the production planning arrangement to reduce
Read more →Injection molding process Mobile phone shell is usually made of PC(polycarbonate) or PC+ABS material molding, due to the relatively poor liquidity of PC, so the process is usually filled with high mold temperature, high material temperature; The gate used is usually the point gate, and graded injection molding should be used when filling, to find the gate position and the V-P(injection – pressure maintaining) switching position, which will be of great help to solve the gate mark and underinjection fly-side and other anomalies. The following is the main molding conditions of mobile phone products, introducing the melt temperature, mold temperature, injection speed, back pressure and other molding parameters setting points for attention. Melting temperature and mold temperature The optimal setting of molding temperature is related to many factors,
Read more →The plastic bottles we often drink have triangular symbols on the back for plastic recycling. The triangles have 1-7 numbers, each representing a different material. The number 1 represents PET, or polyethylene terephthalate Mineral water bottles, carbonated drink bottles are made of this material. Dong Jinshi pointed out that hot water can not be recycled in beverage bottles. This material is heat-resistant to 70℃, which is only suitable for warm or frozen drinks. When loaded with high temperature liquid or heated, it is easy to deform and dissolve harmful substances to human body. Scientists found that after 10 months of use, the plastic could release carcinogens and become toxic to humans. So when you’re done, throw it away. Don’t use it as a water cup, or use it
Read more →How does traditional machining break through the dilemma? The market share of injection caps is gradually expanding, and with the increasing appearance demand of consumers, the role of bottle caps is not only reflected in the sealing, they pay more attention to the appearance of products, such as modeling, refinement, finish and so on. It is bound to have an impact on the production technology of the bottle cap. How to improve the production efficiency while ensuring the quality has become a technical problem in the manufacture of the bottle cap mould. Suction machine will be mixed material into the injection molding machine barrel, heated in the barrel to melt and plasticize state, injected into the mold cavity, cooling in the cavity, demoulding, and then through the ring
Read more →(1) Injection system Injection system function: injection system is one of the most important parts of injection molding machine, generally have plunger type, screw type, screw preplastic plunger injection type 3 main forms. At present the most widely used screw type. Its function is that, in a cycle of the plastic injection machine, a certain amount of plastic can be heated in a specified time after plasticizing, under a certain pressure and speed, the molten plastic is injected into the mold cavity through the screw. After injection, the molten material injected into the mold cavity is kept in shape. Composition of the injection system: The injection system is composed of a plasticizing device and a power transmission device. The plasticizing device of screw injection molding machine is mainly
Read more →Measuring moisture content of plastics is very important, because the existence of plastic moisture usually has a harmful effect on the performance of plastics and molding processing, and water will vaporize at high temperatures, causing defects such as bubbles, jet marks, and silver threads on the surface of the product. Therefore, the moisture content of plastics affects the processing of plastics. An important factor in process, product appearance and product characteristics that must be monitored. 1. The following product defects may occur in plastic injection molding products affected by moisture content: 1). Product dents and bubbles – caused by hygroscopic materials that are not well dried, and residual monomers and other compounds in the materials. To determine the cause of the pores, just observe whether the bubbles of
Read more →In this article, we will talk about how to solve plastic products Weld Line in Injection Molding. Plastic injeciton molding weld lines or weld seams is occured whe melted plastics meet in the form of multiple strands in the cavity due to encountering insert holes, areas where the flow rate is discontinuous, and areas where the filling material flow is interrupted. Produces a linear weld seam, and also creates a weld seam when gate injection filling occurs. This kind of weld line only occurs at the junction of the molten material (using a gate, the products that do not make the material merge from two directions generally have no weld line), that is to say, it only occurs in the molded part with holes, or multiple pouring Mouth-molded
Read more →Weld lines in injection molding not only affect the appearance quality of plastic parts, but also affect the mechanical properties of plastic parts, such as impact strength, tensile strength, elongation at break, etc. In addition, weld lines in injection moulding also have a serious impact on product design and the life of plastic parts, so they should be avoided or improved as much as possible. How is the weld lines in injection molding happened: When the molten plastic encounters inserts, holes, areas where the flow rate is discontinuous, or areas where the filling flow is interrupted in the cavity, the fusion of multiple strands of melt occurs when gate injection molding occurs, the material cannot be completely fused and then weld line in injeciton moulding is happened. Main
Read more →multi-material injection molding technology includes two-shot injection molding, like co-injection, double injection molding and sandwich injection molding, etc. The basic idea of multi-material injection molding is to combine 2 or more materials with different properties to increase product value. The first implant material is called the substrate or base material, and the second implant material is called the over molding material. 1. Various two-shot injection molding technologies During the overmolding process, the cover material is injected over, under, around, or into the substrate to form a complete part. This process can be done by multiple injection molding or insert injection molding. A commonly used covering material is elastic resin. Multi-injection: Multi-injection is a good method of medical device processing if the construction of the covering material allows it.
Read more →Injection Molds Classification or types of mold injection very depend on what we need to make the plastic parts, because every parts have specific and unique design. when design molds we must see what the influencing factor like geometry, number of cavities, ejection principle, plastic material and shape of parts. Below we will explain the mold classification with few most seen types of injection molding molds. The basic classification of mold based on construction shown on picture below 1. Standard Injection Molds The standard plastic injection mold is the most simple design, basically the standard molds is same as two plate molds construction, they divided in two side : cavity side and core side, cavity side is the side that construct to flowing plastic material from nozzle to
Read more →After plastic material injected by nozzle, runner systems will convey the molten material from the plastic sprue gate. basic runner system consist of sprue, main runner, sub runner, cold slug, and gate. since the design of the runner system has large effect on molding quality, molding efficiency, cycle time, cooling time and other factor, it is important key when design of mold. Runner System Construction in injection mold Plastic Sprue sprue will contact first time with melt plastic, at the injection process, sprue always contact with nozzle from plastic injection molding machine, so consider when design the sprue consider the ball radius of nozzle, make sure it isn’t make undercut on sprue.The dimensions of the sprue depend primarily on the dimensions of the molded part in particular the
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