The plastics industry requires dry environments to prevent product imperfections making them unusable at humid times of year. There is a solution: Fisair dehumidifiers designed for plastics industry.
Injection moulds commonly contain cooled water circuits to speed up the cooling of the pieces of plastic. If humidity condenses on the mould, the plastic pieces are not acceptable and the surface of the mould can suffer thermal shocks.
Injection: the presence of humidity
Thermoplastic or resinous raw materials undergo heating processes aimed at increasing the plasticity of the materials so the desired forms can be created in moulds.
Humidity in this hygroscopic raw material (high water absorption capacity), and ambient humidity around the raw material, vaporizes when temperatures rise, which causes structural damage and aesthetic imperfections in end products, resulting in a high percentage of the production being rejected.
If this is your case, we can help you with Fisair dehumidifiers designed for plastics industry.
Most moulding processes refrigerate by using cold air to lower mould temperatures in order to reduce manufacturing times and increase production volumes. Basically, the colder the mould, the quicker the manufacturing cycle becomes. However, operating at low refrigeration temperatures can cause condensation problems in the mould, especially in summer, which can result in deformations in end products.
A relatively simple alternative employed to prevent the formation of condensation just involves increasing the temperature of the surface of moulds, but higher mould temperatures mean longer manufacturing cycles and lower production volumes.
The optimum solution used in the industry to tackle this situation is the implementation of a desiccant rotor dehumidification system, which makes it possible to control dew points on the surface of moulds and it turns to operate using lower mould refrigeration temperatures without the risk of condensation formation. Production volumes can therefore be increased while maintaining the quality of end products.
Corrosion can affect moulds during production processes and during storage:
- During production, as a result of the formation of condensation.
- During storage, due to ambient humidity.
In both cases, humidity control enables their preservation regardless of the temperature, prevents moulds from having to be repaired or replaced, and avoids the costs this incurs.
FISAIR has worked with the most demanding industrial companies in the field of plastics or bottling industry to help increase productivity and quality of their processes.Leave a reply