Manufacturing Medical Plastics is a challenging task, not only because they vary widely in their shapes, size and complexity but also because of their ultra sensitive nature of use and application. The category, includes medical disposable items and simple medical plastics devices such as thermometers, catherers, syringes, blood bags, tongue depressors and gloves. There is absolutely no room for manufacturing defects in Medical Plastics.

Typical plastic materials used for making medical plastics include Acrylonitrile-Butadiene-Styrene (ABS), Nylon (PA), Polycarbonate (PC), Polypropylene (PP), Polystyrene (GPPS) and Polyole?ns (LDPE, HDPE, LLDPE, PP) and Polyster (PET, PBT).

Manufacturing Processes for Making Medical Plastics

Prime processes for manufacturing Medical Devices using plastic are, Extrusion Blow Moulding, Injection Moulding and Injection Stretch Blow Moulding. Extrusion is a continuous process, enabling production of long length of a product. However, continuous extrusions are often cut in application lengths. Injection Moulding on the other hand is a fast process used to produce large number of identical items.

Moisture Problem

Plastic resins are hygroscopic in nature and absorb moisture from their surroundings. Improper drying of resins can cause defects in the product like low tensile strength and impact resistance, surface cracking, internal cracking, surface lines, bubbles, silver streaking etc. leading to rejection.

Mould Sweating

The Injection Moulding process involves injection of plastic melt into the mould and cooling the melt in the mould to take the desired shape. Chilled water used for cooling the plastic melts lead to formation of water droplets on the mould surface. Water droplets tend to drip on the machine bed and seep into the mould, which causes rusting and leads to shape defects in end product.

Conveying Problem

Injection moulding being a fast process and extrusion being a continuous process, requires continuous feed of blended resins into the processing machines. Employing labor to handle resins manually is open to human errors like spillage of resins and delay in changeover of material. Feeding material continuously requires constant monitoring which becomes a tedious task manually, over longer period of time.

Bry-Air Hot Air Dryers and Honeycomb Resin Dryers solves the moisture problem in plastic resins. Bry-Air Mould Dehumidi?cation Systems solve the Mould Sweating Problem and Bry-Air Centralized Conveying System solves conveying Problems.

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Drying, Conveying And Blending

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