Nylon is a reasonably priced translucent material that has decent chemical resistance and performs well in high heat environments. The resins used for extrusion blow molding are typically variants of nylon 6, nylon 4-6, nylon 6-6, and nylon 11. Nylon melts quickly, so it’s more commonly used in injection molding.
#Desktop board blow moulding mchine code
It can be reprocessed, and a few recyclers accept it under code 7. Like ABS, PPO grades can pass UL 94 V-0 flammability criteria. Molded parts are stiff and relatively strong. This restricts designers to PPO parts with generous blow ratios or flat shapes, such as panels and desktops. It requires drying and has a limited drawdown capacity during molding. ABS is recyclable as code 7, but its toughness makes grinding difficult. Various grades can pass the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances Testing (UL 94), Classification V-0. However, parts made from ABS aren’t as chemically resistant as PE or PP, so caution must be used with parts that come in contact with chemicals. Blow molding grade ABS is typically opaque and colored for use in electronics housings and small appliances. However, recycling rates are somewhat limited under code 7 (other plastics).ĪBS is a relatively hard plastic, used to injection mold football helmets. It molds well after drying and generally reprocesses well. TPEs are commonly used in automotive suspension covers and air intake ducts, bellows, and grip surfaces. The material is opaque and can be colored (typically black). TPEs are used to replace natural rubber in molded parts. PET recycling rates are growing under recycle code 1.
The largest PET blow molding market is for soft drink and water bottles. While it isn’t impossible to extrusion blow mold PET, it is less common, as the resin requires extensive drying. PET is a polyester that is usually injection blow molded into clear containers. Special processing equipment is recommended to prevent corrosion from HCl. Common applications include soft medical parts, bellows, and traffic cones. PVC is translucent and comes in rigid and soft forms - the soft resin is typically used in blow molding. Some clarified versions provide “contact clarity.” PP recycling is common under code 5.Īlthough PVC is the world’s #3 plastic, it has been heavily scrutinized for using cadmium and lead as stabilizers, releasing hydrochloric (HCl) acids during processing, and releasing residual vinyl chloride monomers after molding (most of these problems have been reduced). It’s molder-friendly as well as translucent and easily colored. PP is commonly used in elevated temperature applications, such as dishwasher tubes and medical parts that require autoclave sterilization.
PP is similar to HDPE, but slightly stiffer and lower density, which provides some advantages. PP is the world’s #2 plastic - it’s an extremely popular injection molding resin. It is also molder-friendly, translucent and easily colored, chemically inert, and commonly recycled under code 4. The highest usage is blown film for plastic bags. Common applications include squeeze bottles, traffic channelizers, and boat fenders. Generally, the higher the ethyl-vinyl-acetate (EVA) content, the softer the molded part.
#Desktop board blow moulding mchine crack
LDPE is used for softer products that require a high level of stress crack resistance or flexibility. Variations of LDPE include linear-low (LLDPE) and combinations with ethyl-vinyl-acetate (LDPE-EVA). PE the most commonly recycled resin with recycling code designation 2. It’s molder-friendly, translucent and easily colored, and chemically inert (FDA approved and perhaps the safest of all plastics). It’s used in a vast array of products, including bottles for consumer liquids such as shampoo and motor oil, coolers, play structures, fuel tanks, industrial drums, and carrying cases. HDPE is the world’s #1 plastic and the most commonly blow molded plastic material. Here’s an introduction to the characteristics, benefits, and drawbacks to resins commonly used in blow molding. Cost, density, flexibility, strength, and more all factor into what resin is best for your part. Choosing the right plastic resin for your blow molding project can be a challenge.
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