plastic mould and custom injection moulding tips

When the mold was tested, sometimes the product had a serious appearance quality problem with radial white marks appeared on the surface. The white marks tended to be serious with the increase of the glass fiber content. This  is  known as " glass emergence on the surface(also glass fiber rich surface )" which is a surface defect most likely on the  glass fiber plastic products, which is unacceptable for automotive plastic parts with high appearance requirements. [caption id="attachment_3913" align="aligncenter" width="3200"] glass fibre rich surface[/caption] Cause The glass fiber rich surface is caused by the exposure of glass fiber. The white glass fiber appears on the surface during the plastic melt filling and molding. After condensation and molding, radial white marks are formed on the surface of the plastic part. When the plastic part is black ,it will become more obvious as the color difference increases. There are several reasons b...

A system which constant transfers heat from the melt in the mold or heats the mold to the injection temperature is called a temperature control system. Mold temperature refers to the surface temperature of the mold cavity that comes in contact with the product. It directly affects the flow of the melt, the cooling of the product, and the quality of the product. An injection mold is a production tool which can repeatedly mass-produce plastic products with the same structure and the dimensional accuracy . it is a heat exchanger. In order to ensure the molding quality and production efficiency, it is necessary to use the medium to heat or cool the mold to control the temperature within a reasonable range. The productivity of the mold depends on the speed of the mold heat exchange. The speed of the mold heat exchange depends on the mold heat exchange. The mold heat exchange depends on the temperature of the melt, the demolding temperature, and the plastic. The design of the temperature ...

Strategic injection molding and tooling procurement is the process of establishing service supply channels at the lowest total cost, and is a systematic, data analysis-based procurement method. On the one hand, through understanding the injection molding and tooling supplier's production capacity and market conditions, the company helps the company to strategically introduce competition into the supply system to reduce procurement costs on the other hand, it can effectively control its demand by helping the injection molding and tooling company to better understand the internal demand model. Strategic procurement includes the following important principles: Consider the total cost the total cost is not a single purchase price, but includes the entire process from injection molding and tooling pricing to material delivery, storage, use, conversion to the corresponding product, until the product is accepted or complained by the customer. The sum of expenditures; Turning negotiations...

Mold Structure 1. Before everything else, it will be significant to completely be aware of the specialized specifications of the plastic mold construction, steel, hardness, accuracy, and so on., which includes the shrinking amount of the resin , Three-dimensional measurement, and producing evaluation. 2. Completely think about the shrinking, flow mark, draw direction, weld line and fracture of molded items. 3. Make ease of the mold creation if possible devoid of limiting the perform of the injection product and the structure. 4. Whether or not the choice of parting surface is acceptable needs to be cautiously picked out for die developing, developing overall look and deburring of established parts. 5. Whether or not the ejection strategy is suitable, regardless of whether ejection pins, stripper plate, ejection sleeve and some other approaches are implemented. 6. Whether the slider mechanism is acceptable, the motion is manageable and trustworthy, and there shouldn't be any phe...

Rusting of plastic molds is a normal phenomenon and  caused by special reasons.It is not always due to quality problems of steel products. Melt Decomposition Some plastic raw materials will release volatile gases after being heated, which are corrosive and corrode the mold steel. Therefore, when the injection machine stops , wipe the mold clean with soft rag and close the mold. If the mold downtime is for a long time, anti-rust  spray shall be used in the mold cavity. Butter shall be used to plug the gate when the mold is closed. Cooling Water Cooling water is mostly used in the mold for cooling, so there is more moisture around and inside plastic mold. If the mold is cooled below the dew point, moisture in the air will become water droplets on the surface of the mold, which will easily rust if it is not wiped off in time. Even after the mold stops working for a short time, condensed water will be seen soon. Therefore, when the molding is stopped, the cooling water shoul...

Storing Molds During downtime, plastic molds are generally removed from the molding press and put into some kind of maintenance . The mold warehouse  usually has s few heavy-duty steel shelves where the molds are positioned onto ,and labeled for identity. Generally, the mold contains particular identity engraved on perhaps 2 adjacent walls so it's easily observable, and the shelf comes with an id label attached to each place that matches the mold identity. This assists you to hold everything in arrangement and prepare for following jobs. The sort of mold maintaining in the course of storage relies on how much time required. Long-term storing needs a heavy-duty treatment that generates a thicker layer of protective substance on the mold. But this layer is tough to clear out. A significantly lesser layer does apply for short-term holding. Short-term storage Short-term storing can be regarded as holding which will be for less than a day roughly, totally about Four weeks. For this pa...