The most important process conditions in the
injection process are the temperature, pressure, speed, and the corresponding individual action time that affect the plasticizing flow and cooling. These factors, in turn, influence and constrain each other, such as increasing the melt and mold temperature, which can reduce the injection pressure and speed, etc., and vice versa, which requires increasing the injection pressure and speed.
The core of the influence of various process conditions lies in the change of plastic viscosity, which is crucial for the reasonable selection of parameters in the
injection process and the influence of each other.
The following advantages exist for the use of high-speed injection in the injection process:Improving the flow of the plastic, which facilitates the molding of thin-walled parts.
Improving the surface gloss of the product.
The possibility of improving the strength of the fusion line, making the fusion pattern less obvious.
Preventing the generation of cooling deformation, etc.
The advantages of using a low-speed injection in the injection process include:Preventing the formation of flying edges on molded products.
Preventing the generation of jet lines and flow lines.
Preventing the production of burn marks.
Prevention of air entrapment in the plastic melt.
Prevention of molecular orientation deformation, etc.
The advantages of high-speed injection are also the disadvantages of low-speed injection and vice versa. Therefore, the combination of high speed and low speed in the injection process can make full use of their respective advantages and avoid their respective disadvantages, thus ensuring the quality of the product and the economy of the process.
This is what we usually refer to as multi-stage
injection technology, which has been commonly used in modern
injection molding machines. At present, most of the medium-sized injection molding machines have five to six injection pressure, speed changes, and three to four pressure-holding pressure changes (because the pressure-holding stage, the melt has filled the cavity, the melt through the pressure-holding pressure into the cavity of the complementary shrinkage material has been limited, so the impact of pressure-holding speed is not significant).
Latest blog posts
Custom molds injection molding
Custom molds injection molding is a manufacturing process that involves creating custom molds to produce plastic parts. Injection molding is a popular technique used in various industries such as...
Plastic injection molding companies
Plastic injection molding is a manufacturing process that involves injecting molten plastic into a mold to create a wide range of plastic products. From car parts to medical devices and household items, plastic injection molding is used to create a variet
PET Preform Injection Moulding Machine
PET preform injection molding is a manufacturing process that is used to create PET (polyethylene terephthalate) preforms that can be later blown into bottles, jars, and other containers. This process...
You may like
Injection molding machine opening and closing mold control needs to pay attention to the problem
Mold opening control.After the molten plastic is injected into the mold cavity and cooled, the mold is opened and the product is removed. The mold opening process is also divided into three...
Injection molding design: ten keys to success (II)
The first part of this article detailed five of the ten main design-related parameters that affect the quality of injection molded parts: material selection and consequences, critical tolerance, dent marks...
Understanding of PMMA injection molding process
Polymethyl methacrylate, acrylic, and lipids converge to obtain polymers commonly known as acrylic esters, the relative plastic is commonly known as polyacrylic acid plastic, which is the most common use of polymethyl...
Newcomers must have a complete knowledge of two-color injection molding
Two-color injection molding refers to the molding method of injecting two different colors of plastic into the same mold. It can make the plastic parts appear in two different colors and can make the plastic parts present regular patterns or irregular clo