Plastic injection mold heating
When the plastic injection molding process requires the mold temperature to be above 80°C, a temperature adjustment system with heating function must be provided in the mold. In addition, thermoplastic injection molding often needs to heat the mold before molding in the cold winter, because if the weather is too cold, the molten plastic has solidified before being injected into the mold and cannot fill the entire cavity. Thermosetting molds also need heating, heat retention, and pressure retention during the molding process to solidify the raw materials, the mold processing bakelite and the dry press mold for processing Gabu epoxy resin do not have a gating system aggregate, but they need to be heated.
The heating methods of the mold include: hot water, hot oil, steam, resistance heating pipe, etc.
Water and oil heating method:
The hot water, hot oil, and steam is also used to heat the mold through the cooling channel in the mold, the mold structure and design principles are exactly the same as the cooling water channel, the use of hot water and hot oil to heat the mold requires supporting equipment, a mold temperature controller, which is widely used in injection molds, and its main functions are as follows:
1. Improving the molding efficiency of plastic parts;
2. Reducing the production of defective products;
3. Improving the appearance quality and reduce the defective of plastic parts;
4. Increasing the production speed, reduce energy consumption and save energy.
There are two types of mold temperature controllers: water and oil mold temperature controllers (see picture 1 and picture 2).
Features of water temperature controller:
1. The operating temperature range is 40-180℃, accurate to ±1℃;
2. Simple computer touch control operation;
3. Automatic venting;
4. There are display of outlet water and return water temperature;
5. Stainless steel pipes to reduce pipe resistance and rust;
6. The failure is displayed, and the maintenance does not require professionals.
Features of oil temperature controller:
1. The temperature controller adopts touch-type internal storage, automatic calculation, accurate and reliable, and can be controlled within ±2℃, saving more than 35% of electricity;
2. Two sets of electric heating pipes can be used individually or together;
3. The heating and cooling time is fast, and the temperature is stable;
4. The electric heating pipe is made of stainless steel;
5. Perfect safety protection and failure indication system;
6. Imported high-grade components are used, and long service life;
7. Easy to operate and maintain.
water temperature controller
oil temperature controller
Gas-assisted injection molding product defects and solutions
Apr 28, 2022Common defects and solutions of gas-assisted injection moulding: 1. Gas blows out the melt like in picture 1. Reason: insufficient pre-filled amount. When the plastic part is a locally thickened...viewPlastic injection mold runner system design
Jan 16, 2022The gate is the connecting part between the runner and the cavity, and is also the end part of the injection mold gating system, the molten plastic enters the cavity and core side through the gate...viewThe principle of mold temperature balance in plastic mold cooling system design
Feb 21, 2022The principle of mold temperature balance: 1. Due to the complexity of the plastic parts and mold structure, it is difficult to make the temperature of the mold completely consistent, but should be...viewSide gate of plastic injection mold runner system design
Jan 23, 2022In order to get the best injection quality, the gate type must be selected carefully, the coommon gate tyeps are: direct gate, side gate, pin-point gate, sub gate,valve gate of hot runner etc. Among...viewPlastic part ribs desigining
Jan 4, 2022The ribs function: The role of ribs is to improve the strength and rigidity of the plastic parts, prevent the plastic parts from being distorted and deformed, and will not cause the appearance of the...viewSlider of side core pulling mechanisum assembling
Jul 21, 2022The picture 1 shows a typical guide pin driven slider parting and core-pulling mechanism, we will talk about the composition and function of the lateral core-pulling mechanism. 1. Lateral forming...view