plastic mould and custom injection moulding tips

China Injection Mold Cost Many buyers who purchase injection molds from China are solely focused on saving money . However, this isn’t the right attitude to take, since you’ll ultimately want a mold that works properly and is reliable, instead of just being cheap. How much a plastic mold tool will cost is dependent on several different factors. You should, therefore, request the  information when getting a quote. The checklist below details the various areas of interest that you need to consider when purchasing a mold: How many check dimensions are required on the print- this will determine the cavity complexity, as well as the part tolerances Surface finishes which will be necessary Number of necessary tight tolerances and their requirements Any required functions in mold operating, such as unscrewing or lifters. Balanced cooling requirements- these can  determine  tolerances. Part resin Number of cavities in the part, determined by tolerances and ...

The gas-assisted injection molding system directly injects inert gas (usually nitrogen) into the melt plastic in the mold cavity through the sectional pressure control system, which makes the plastic part expand and cause hollowness, but still keeps the shape of the product surface. Gas-assisted injection molding can be regarded as a variant of hollow blow molding. The process of gas-assisted injection molding is to inject an accurately measured plastic melt which accounts for a certain proportion of the mold cavity. This process is called "short-shot-injection molding", and then directly inject a certain volume and pressure of high-pressure nitrogen into the molten plastic, and the gas diffuses along the direction of minimum resistance surrounded by the plastic melt. Because the plastic temperature near the mold wall is low and viscosity is high, while the plastic melt in the center of the thicker part is of high temperature and of low viscosity, the gas can easily penetrate...

The gate is a short groove with a small cross-sectional area to connect the runner and the cavity. Therefore, the cross-sectional area should be small in order to obtain : Soon after the cavity is injected full, the gate will be solidified Simple demoulding The part ejection is completed, leaving only a few traces Makes the filling of multiple cavities easier to control Reduce excessive runner scrap Gate location and size 1) Place the gate at the thickest part of the product, and injection on the thickest part can provide better filling and pressure holding . If the holding pressure is insufficient, the thinner area will solidify faster than the thicker area. Avoid placing the gate at a sudden thickness change section to avoid hysteresis or short shots. 2) If possible, set the gate in the center of the product . Placing the gate in the center of the product can provide equal length flow. The flow length will affect the required injection pressure. The central gate mak...

In the process of injection molding, the bubble inside is a serious defect. Air bubbles in injection molded transparent parts will affect the appearance quality of products. At the same time, it will also reduce the strength of injection molded products. The bubbles are mainly produced in the process of injection molding: The raw materials are not dried enough or air mixed in the raw materials. In the injection molding process, the injection speed is too fast, the residual material inside barrel is too much, and the back pressure is too low. Poor mold venting and low mold temperature. How to solve: Raw materials should be fully dried. Reduce the screw temperature and the temperature of the feeding port. Increase the back pressure  and reduce the ejection position of screw (more residual material). Reduce injection speed and increase mold temperature. Increase the injection pressure and time and improve the venting of the mold. Retain bubbles on the nozz...

One of the important reasons for the warpage of strip flat injection molding parts is the position of the gate on the injection molding parts. There are usually three positions of the gate on the strip injection molded part,and these will cause warpage of the strip-shaped flat injection molded parts. [caption id="attachment_4417" align="aligncenter" width="563"] strip-shaped flat parts injection molding[/caption]   For example (Figure A) , the gate position of the strip flat plate is set at one end of the injection-molded part, which can make the injection-molded part obtain consistent shrinkage in the flow direction. Injection molding : Injection molding is relatively simple for long flat injection molding parts with this gate position . However, it should be noted that the distance from the gate to the end of the injection molded part couldn't be too long, so as to prevent the deformation caused by the different filling. Mold : For the long strip-...

In three forms it is important to consider how the costs of injection molding are determined:  To check if the commodity is competitive on the market, To recheck with evolving plastic fabrics, cavities, volumes or press measurements so that we can see if additional benefit is produced and To determine whether the molding costs of the out-sourcing manufacturer are appropriate.  To assess molding prices, four basic elements must be analyzed: equipment costs, labour costs, process speeds and tooling costs. The volume or expenses per cubic inch was not just the expense per pound of raw material to be obtained when measuring production quality. If necessary, regrind plastic is good to use as the cost typically amounts to around half of new plastic material. Typically 18 percent of the sum by weight is the assurance that injection molded part should be safely used. Tests demonstrate, though, that 100% regrind may be of same performance  as 100% virgin mater...

Polycarbonate injection molding Topworks is a professional manufacturer of poly-carbonates injection molding. We have more than 10 years of production experience in poly-carbonates injection molding We have rich experience in the production of extra wall thickness poly-carbonates and ABS/PC injection molding part. Our PC injection molding covers the following industries： Automobile parts Medical instruments Aerospace Packaging field Electronic appliance optical lens LED lighting The maximum wall thickness of the PC product can reach 3 cm , but the surface does not shrink and there are no bubbles inside. https://www.youtube.com/watch?v=ms2aPfCHdzc&feature=youtu.be   EXTRA WALL THICKNESS POLY-CARBONATE INJECTION MOLDING CASE #1  CASE    [caption id="attachment_3326" align="aligncenter" width="1139"] extra wall thickness 32 mm poly-carbonate injection molding[/caption] [caption id="attachment_3325" align="alignnon...