Plastic material basic information
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Tooling Developing Procedure
Plastic Mold Operation Manual
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Plastic basic information
Plastic material basic information
Plastic mold basic information
Plastic Grid

Plastic material basic information

Regrind Material

The important consideration should be end product and what your definition of "REGRIND" is. Reprocessing your own internal scrap (if kept clean and uncontaminated with anything else) is a significantly different question basis than using unknown or unclassified "regrind" from outside sources.As to the end applications – many custom processors adopt a simple program internally like the 80:20 approach above simply because it generally insures inventory 'velocity' versus turning cash into useless warehouse ballast by using start-up scrap, sprues etc back into the product as the run progresses.There is no written down /prescribed guidelines for use of Regrind or process waste back into to Processing machines (Injection molding/Extrusion/Blow etc). For non-engineering products & commodity products in India, there are processors who use only Recycled/Regrind material for cost effectiveness. Generally, most of processes 80:20 virgin to regrind is preferred, but it's not a guideline. All depends upon type of product, property requirement & application of products etc.

What kind of injected plastic can bear high temperature?

It's a small plastic injected piece that will be submitted to short period of time (2 seconds) of high temperature (95-105ºC approx.) in every cycle; this high temperature is produced by a filament where electric current passes through (like a house light bulb but hotter) for no more than 2 seconds in the process cycle. A complete process cycle last for about 45 seconds where the piece has time to cool off again. This plastic piece has to work for about 45-50 complete process cycles.PP or Nylon will work well (PE is very hard to flame retard and has a much lower softening point). I would however suggest that you look at a flame retarded nylon 6 or 66 that is specifically designed for this type of exposure. You want to look at the Glow Wire Flammability Index (IEC 60695-2-12) of the grade. You want to make sure that the materials rating (maximum temperature) is higher (maybe 50-100°C higher than your conditions, temperature, exposure time, part thickness, I say this because it is very difficult to estimate the radiated heat and resultant temperature). These grades are made by Sabic-IP (under the Starflam tradename), Lati, RTP, BASF and others. 

How to choose plastic material?

Plastic MaterialFeaturesApplicable products POMLow friction coefficient,Good geometric stabilityEspecially suitable for the production of gear and bearing      PA PA6Good elasticity,High impact strength,Water absorption is biggerSuitable for making general machinery parts, reduce friction wear parts, transmission parts, as well as chemical, instrumentation and so on. PA66Better than PA6,High strength,Good abrasion resistance PA610Similar to PA66,but small water absorption,Low stiffness PA1010Translucent,Small water absorption,Good cold resistance   PC Very good impact strengthm,Thermal stability, Glossiness,Inhibit bacteria,Flame retardant properties and stain resistanceElectrical and business equipment(computer components, connectors, ect.), Appliances(food processor, a refrigerator drawer, ect.), The transportation industry(the vehicle’s front and rear lights, dashboard, ect.) PETGTransparent,high strength,high wayward integrated featuresPlate, sheet, special-shaped material (film, bottles), cosmetics packaging   PPO Non-crystalline material,Moisture absorption of small,Poor liquidity,Low bibulous rate is about 0.06%Suitable for production of heat resistance, insulation parts, antifriction, wear parts, transmission parts, medical and eletronic parts(screws, fasteners and fittings )   PBTOne of the most tenacious engineering thermoplastic materials Have a very good chemical stability, mechanical strength, electrical insulation properties and thermal stability Home appliances (food processing blade, vacuum components, electric fans, hair dryer, coffee ware, etc.), electrical components (switch, electrical cabinet, fuse box, computer keyboard key, etc.), automotive industry (radiator shutters, panels, wheel cover, car body, door and window components, etc.)     PMMAExcellent optical properties and resistance to climate change.The white light penetrability is as high as 92%Have very low birefringenceHave room temperature creep propertyHave good impact resistance propertiesautomobile industry(signal equipment, instrument panel, etc.), pharmaceutical industry (ChuXie container, etc.), industrial applications (video, light scattering), consumer goods (drink cup, stationery, etc.)