How to produce a qualified plastic product
It refers to the part of the flow channel before the plastic enters the cavity from the nozzle, including the main flow channel, the cold feed hole, the diverter, and the gate, among others.
2. Molding parts system:
It refers to the combination of various parts that constitute the shape of the product, including moving die, fixed die and cavity (concave die), core (punch die), molding rod, etc. The inner surface of the core is formed, and the outer surface shape of the cavity (concave die) is formed. After the die is closed, the core and cavity form a die cavity. Occasionally, according to process and manufacturing requirements, the core and die are made from a combination of working blocks, frequently from a single piece, and only in the easily damaged and difficult-to-work parts of the insert
3, the temperature control system.
In order to meet the injection process temperature requirements of the die, it is necessary to have a temperature control system to regulate the temperature of the die. For thermoplastic injection mold, the main design of the cooling system to cool the mold (can also be heated the mold). A common method of cooling molds is to set up a channel of cooling water in the mold and use the circulating cooling water to remove the heat from the mold. In addition to heating the mold, cooling water can be used to pass hot water or hot oil through, and electric heating elements can be installed inside and around the mold.
4. Exhaust system:
It is set so as to exclude air in the cavity and gases from plastic melting during injection into the mold.. When the exhaust is not smooth, the surface of the product will form air marks (gas lines), burning and other bad; The exhaust system of a plastic die is usually a groove-shaped air outlet built into the die to expel the air from the original cavity and the gases brought in by the molten material..When the molten material is injected into the cavity, the original air in the cavity and the gas brought by the melt must be discharged to the outside of the mold through the exhaust port at the end of the material flow, otherwise it will make the products with pores, poor connection, mold filling dissatisfaction, and even the accumulated air will be burned due to elevated temperature caused by compression. under normal conditions, the vent can be located in the cavity at the end of the flow of molten material, or in the parting surface of the die.
The latter is a shallow groove with a depth of 0.03 – 0.2 mm and a width of 1.5 – 6 mm on the side of the die..There will not be a large amount of molten material oozing out of the vent during the injection, as the molten material will cool and solidify in the channel here..The opening position of the exhaust port should not be directed at the operator to prevent accidental ejection of molten material.. alternatively, it can exhaust the gas using the matching gap between the ejector bar and the ejector hole, and between the ejector clump and the template and core.
5. Guiding system:
This is set up to ensure that the moving and fixed modes can be accurately aligned when the mode is turned off..The guiding part must be set in the mold..In injection, the moulds are normally formed using four sets of guide columns and guide sleeves, and occasionally it is necessary to set up in moving and fixed moulds, respectively, with the inner and outer conical faces of each other to assist in positioning.
6. Ejection system:
Examples include: thimbles, front and back thimbles, thimbles guides, thimbles reset springs, thimbles lock screws, etc..When the product is formed and cooled in the mold, the front and back of the mold are separated and opened, and the plastic products and their coagulant in the flow channel are pushed out or pulled out the mold opening and flow channel position by the ejector rod of the injection molding machine, so as to carry out the next injection molding working cycle.
Post time: Nov-22-2022