The flash is essentially the excess left on the product after cooling in the gap where the plastic material enters the matching part of the mold. This is a problem that many injection mold factories will encounter. To solve the problem of flash is very simple, that is to control not to let the melt enter the mold fit gap. So how to solve it?
In some injection mold factories, the clamping force of machines is insufficient, which is higher than the tension formed by the longitudinal projection area of injection products during injection, otherwise it will cause die expansion and flash; The mold closing device is not apintejinusted well. When one side of the mold is closed tightly and the other side is not tight, flash will occur during injection; The parallelism of the die itself is poor, or the installation is not parallel, or the template is not parallel, which will lead to tight clamping and flash.
(2) Mold aspect
The accuracy of mold parting surface is poor, the mold design department is reasonable, and the opening position of mold cavity is too offset, which will cause tension on one side of the mold during injection and cause flash.
(3) Process aspect
Too high injection pressure or too fast injection rate, too large feeding amount, too high barrel and nozzle temperature or too high mold temperature will cause flash.
(4) Plastic raw materials
The viscosity of water absorbent plastics or water sensitive plastics will be greatly reduced at high temperature, increasing the possibility of flash, and these plastics should be thoroughly dried; If the plastic viscosity is too high, the flow resistance increases, resulting in large back pressure, which increases the pressure in the mold cavity, resulting in insufficient clamping force and flash; In addition, when the particle size of plastic raw materials is uneven, the feeding amount will change indefinitely, resulting in dissatisfaction or flash of injection molded parts in the injection molding process.
If you want to know more about injection molding, processing and other related knowledge of injection mold factory, you can log in to the official website of pintejin Molding Co., Ltd., where there is a more detailed introduction.
About China pintejin Molding Industrial Company Limited
pintejin Mold is a China mold maker of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer, mold manufacturer China– plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.
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