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MISI MEDICAL TECHNOLOGY (HK) CO., LIMITED
Medical | Laboratory | Beauty | Animal Healthcare products

05/04/2023

04/04/2023

Plastic Molding Process - Extrusion Molding
The extrusion molding method is that the material passes through the action between the barrel of the extruder and the screw. While being heat-plasticized, it is pushed forward by the screw rotation and pressure, and the plasticized plastic is continuously extruded into the mold. Die, the process of obtaining plastic profiles adapted to the shape of the die, used to manufacture such as films, continuous sheets, tubes, profiles, rods, sheathed wires, filaments, wires, and cables.

Extrusion molding, also known as extrusion molding or extrusion molding, mainly refers to the extrusion of a screw or plunger to make the heated and melted polymer material be forced through the mold of the head under the pressure to form a constant A forming method for cross-sectional continuous profiles. The extrusion molding process mainly includes the processes of feeding, melting plasticization, extrusion molding, shaping and cooling.

The extrusion process can be divided into two stages: the first stage is to make the solid plastic plasticized (that is, to become a viscous fluid) and make it pass through a special-shaped die under pressure to become a continuous section similar to the shape of the die. body; the second stage is to use appropriate methods to make the extruded continuum lose its plastic state and become solid to obtain the desired product.

Extrusion molding is a high-efficiency, continuous, low-cost, and wide-adapted molding processing method. It is an earlier technology in the processing of polymer materials. After more than 100 years of development, extrusion molding is an important part of the polymer processing field It is a molding processing method with the most varieties, the most changes, high productivity, strong adaptability, wide range of uses, and the largest proportion of output.

04/04/2023

Plastic Molding Process - Injection Molding
Injection molding is a method of stirring completely molten plastic materials through a screw at a certain temperature, injecting them into a mold cavity with high pressure, and obtaining molded products after cooling and solidification. This method is suitable for mass production of parts with complex shapes and is one of the important processing methods.

The advantages of the injection molding method are fast production speed, high efficiency, automatic operation, various designs and colors, simple to complex shapes, large to small sizes, accurate product sizes, easy replacement of products, and complex shapes. parts.

In the injection molding process, plastic is placed into a hopper, which then injects heated plastic, which is pushed through a long chamber with a reciprocating screw. Afterwards, it is softened into a fluid state. Nozzles are located at the end of the chamber through which the fluid plastic is forced to cool and close the mold. While the plastic cools and solidifies, the semi-finished product exits the press.

04/04/2023

Medical Plastic Material - Acrylonitrile butadiene styrene (ABS)
• Advantages: Hard, with strong impact resistance, scratch resistance, dimensional stability, etc., moisture-proof, corrosion-resistant, easy to process, and good light transmission.
• Disadvantages: poor heat resistance, not resistant to organic solvents.
• Uses: Surgical tools, roller clips, plastic needles, tool boxes, diagnostic devices and hearing aid casings, especially some large medical equipment casings.

04/04/2023

Medical Plastic Material - Polyetheretherketone (PEEK)
• Advantages: heat resistance, wear resistance, fatigue resistance, radiation resistance, corrosion resistance, hydrolysis resistance, light weight, good self-lubrication, and good processing performance. Can withstand repeated autoclaving.
• Disadvantages: Expensive.
• Uses: It can replace metals in surgical and dental instruments, and replace titanium alloys in the manufacture of artificial bones and bone nails.
(Metal instruments may cause image artifacts or affect the doctor's surgical field of view during minimally invasive surgery clinical operations. PEEK is as tough as stainless steel, but it will not produce artifacts.)

04/04/2023

Medical Plastic Material - Polyamide (PA)
• Advantages: flexibility, bending resistance, high toughness, not easy to break, good heat resistance, chemical tablet resistance and abrasion resistance. Does not release any harmful substances and therefore does not cause skin or tissue inflammation.
• Disadvantages: high water absorption.
• Uses: Hoses, Connectors, Adapters, Pistons.

03/04/2023

Medical Plastic Material - Polytetrafluoroethylene (PTFE)
• Advantages: high crystallinity, small friction coefficient, good heat resistance, high chemical stability, strong acid and alkali and various organic solvents are not affected by it. It has good biocompatibility and blood adaptability, no damage to human physiology, no adverse reaction when implanted in the body, can be sterilized at high temperature, and is suitable for use in the medical field.
• Disadvantages: expensive.
• Uses: All kinds of artificial trachea, esophagus, bile duct, urethra and artificial peritoneum, brain dura mater and artificial skin, artificial bone, artificial blood vessel, precision catheter, guide wire, etc.

03/04/2023

Medical Plastic Material - Thermoplastic Polyurethane (TPU)
• Advantages: good transparency, high strength and tear performance, high elasticity, high flexibility, can be coated with a variety of plastics, chemical resistance and abrasion resistance; wide range of hardness, smooth surface, anti-fungal and microbial , High water resistance.
• Disadvantages: low heat resistance.
• Uses: medical catheters, oxygen masks, artificial hearts, drug release equipment, IV connectors, rubber pouches for blood pressure monitors, medical suction cups, wraps for extracutaneous administration, etc.

03/04/2023

Medical Plastic Material - Polypropylene (PP)
• Advantages: low price, low density, non-toxic, tasteless, good mechanical properties, chemical stability and heat resistance. Good insulation, low water absorption, good solvent resistance, oil resistance, weak acid resistance, weak alkali resistance, good molding, no environmental stress cracking problem.
• Disadvantages: The molding shrinkage rate is large, and the manufacture of thicker products is prone to defects. The surface is inert, the coloring is not good, and it is difficult to print and bond. Susceptible to thermal aging.
• Uses: Disposable syringes, connectors, clear plastic covers, straws, parenteral nutrition packaging, dialysis films, urine cups, etc.

03/04/2023

Medical Plastic Material - Polystyrene (PS)
• Advantages: low cost, low density, transparent, dimensionally stable, radiation resistant (sterilization).
• Disadvantages: poor heat resistance, poor weather resistance, brittle products.
• Crystalline Polystyrene Uses: Laboratoryware, petri dishes and tissue culture dishes, respiratory equipment and suction jars, etc.
• High Impact Polystyrene Uses: Catheter trays, cardiac pumps, dural trays, respiratory equipment and suction cups, etc.

03/04/2023

Medical Plastic Material - Polyethylene (PE)
• Advantages: low price, good insulation, high chemical stability, good biocompatibility
• Disadvantages: poor heat resistance.
• Low-density polyethylene (LDPE) uses: medical packaging and intravenous injection containers, medical hard packaging (medicine bottles, bottle caps), infusion bags, syringes, pharmaceutical composite films, etc.
• High-density polyethylene (HDPE) uses: artificial urethra, artificial lung, artificial trachea, artificial larynx, artificial kidney, artificial bone, orthopedic repair materials.
• Ultra-high molecular weight polyethylene (UHMWPE) uses: artificial lungs, artificial joints, etc.

03/04/2023

Medical Plastic Material - Polycarbonate(PC)
Polycarbonate is one of the most popular medical device plastics. The material is resistant to impact, UV rays and high temperatures. It is transparent, dimensionally stable and flame retardant. It can withstand gamma-ray or ethylene oxide sterilization and can be assembled by ultrasonic welding. Typical applications include high pressure syringes, arterial cannulas, stopcocks, centrifugal separators, blood filter housings and dialyzer housings.
• Advantages: toughness, strength, rigidity and heat-resistant steam sterilization, high transparency.
• Disadvantages: The gap is sensitive and prone to stress cracking. Forming processing requirements are high, and the radiation turns yellow.
• Uses: shell surgical masks, hemodialysis filters, various shells, trocars, connectors, surgical tool handles, oxygen tanks, needle-free injection systems, perfusion instruments, blood centrifuges and pistons, etc.

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Eastcore, 398 Kwun Tong Road, Kwun Tong, Kowloon, China
Hong Kong

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http://www.misimed.com/

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