In this article, we are going to express the advantages of the hot channel system compared to the cold channel. But in order to make the matter more understandable, we will first discuss a little more about the cold injection process and its difference with the hot method.
In the process of cold injection, after the filling of the cavities and the start of the cooling operation, apart from the contents inside the cavity (which forms the final product), the whole passage of the molten polymer from the nozzle of the injection device to the entrance gate of the cavity of the mold, which It includes the sprue, the main channel, the secondary channel and the gate, and it is cooled along with the final product and separated from the mold by the pressing system. If these waste materials are not recyclable, they are thrown away as production waste, and if they are recyclable, they are stored in the warehouse, and later a percentage of it is mixed with raw polymer materials and used again in the injection process. The reuse of recycled materials imposes the cost of processing and milling operations and reduces the appearance quality and mechanical strength of the product.
Also, the cold passage of molten polymer during the injection operation causes the loss of critical process parameters such as melt temperature, injection pressure, packing pressure, etc.
However, in hot tunnel systems, the temperature of the molten polymer throughout the passageway (consisting of manifold and nozzle) is controlled and maintained point by point, and these materials are delivered to Quetta with the lowest percentage of parameter loss and this makes the tunnel systems superior. It is hot compared to cold, which we will mention some of them below.
- 99% reduction in waste from production by eliminating channels
- Reducing the cooling time by eliminating the channel cooling time and increasing the production speed
- Reducing the gate effect and increasing the appearance of the product
- Reducing up to 30% of energy consumption by choosing an injection machine with a lower tonnage due to the reduction of the required injection pressure
- Reduction of Shrinkage and Warpage values due to the increased effect of packing pressure, especially at points far from the injection gate
- Improvement of product surface quality due to increased impact of packing pressure throughout the product
- Increasing weight and improving mechanical strength by reducing the void inside the product due to the increased effect of packing pressure throughout the product
- Reducing the cost of warehousing and milling and preventing the wastage of raw materials and reducing the cost of the product
- Creating the possibility of automatic production process by removing the intervention of the operator to separate the channel from the product after the mold is opened