How to Select Plastics Auxiliary Equipment ─ Feeding and Conveying

Conveying system mainly consists of controller, vacuum blower, dust collecting bin and suction hopper.

No matter the material conveying system is single equipment or automatic central feeding system, it is necessary to consider whether the conveying capacity meets the requirement of production line , sort of materials, grain size, conveying distance, convenience and flexibility of material requirement, and also the possibility of expansion in the future.

Conveying capacity is decided by the vacuum blower, which includes root blower and normal high pressure blower.

Plastics feeding and conveying equipment is widely used in the product line of plastics processing, which can save labor and time for plastics carrying and space for raw materials.

Material is often conveyed by means of gas conveying. In a few words, raw material is conveyed from one place to another pointed place by gas flowing. Gas conveying includes positive pressure conveying and negative pressure conveying. The former is suitable for long-distance conveying, which conveys large amount of materials by compressed air in an energy-saving and high-efficiency way. Negative pressure conveying conveys materials from different places in a short distance to hoppers, and then the material is conveyed by suction box from the bottom of the hopper to storage bin or other recipients. Materials conveying velocity in the pipeline is lower than its suspend velocity, which is suitable for conveying powder and granular materials. Gas conveying includes three types: low speed low density material conveying, high speed high density material conveying and Venturi tube material conveying.

In most product line of plastics processing, low speed low density material conveying is mainly adopted, which is also called vacuum suction. It uses vacuum pump to create vacuum attraction, and then adjusts the proportion between raw material and air to convey them. Negative pressure of vacuum pump is usually controlled restricted between -2000~-5000mmAq.

Dust collecting bin can filter and collect dust in the process of material conveying, and avoids pollution in workplace. Cleanness and convenience should be considered.

Suction hopper is equipment installed above the molding machine or the material storage bin, which can be equipped with optional parts according to requirements of manufacturing equipment, such as proportional valve, shut-off valve, and suction box. Suction hopper capacity should be in accordance with conveying capacity, material needed in a molding cycle and convenience of material cleaning and replacing.

The controller of feeding system should have functions of easy operation, modularization, central monitoring and extensibility so as to monitor the whole factorys material management.

─ How to choose plastics auxiliary equipment-Dosing & Mixing Series will be published in the 5th View of Shini