1. Process classification:

　　 Molded foaming: primary foaming (large mold, small mold), secondary foaming

　　Injection foam: MD, slippers

　　 Continuous foaming: EPE

　　Extrusion foaming: board

　　 2. EVA foam basic formula:

　　EVA/LDPE blowing agent bridging agent zinc oxide pigment filler lubricant special functional additives

　　1. Main ingredients:

　　LDPE: It can make foamed products with larger magnification, harder without resilience, mainly used for foaming insulation materials, slippers, bags, etc.

　　EPDM: Increase flexibility

　　Natural rubber: increase anti-slip performance

　　2, foaming agent

　　 Existing high, medium and low temperature

　　High temperature: good magnification, but affects the color of the product

　　Medium temperature: for injection and small molds

　　 Low temperature: For MD, and products with color requirements

　　3, crosslinking agent

　　DCP: versatility, low price, but tasteful

　　 BIPB: called odorless bridging agent, the advantage is that it can reduce the irritation of foamed products

　　TAIC: Auxiliary crosslinking agent, can effectively help improve the speed and effect of crosslinking

　　4, zinc oxide

　　Classification: Class A, active, zinc carbonate

　　 Grade A: high merit content, good product properties; but high price and heavy metal content may exceed the standard

　　Activity: low content, low price but low heavy metals

　　Zinc carbonate: low content, small particles, fast foaming, suitable for making relatively low-end products

　　5, pigment

　　 Masterbatch: good dispersibility, positive color

　　 Toner: low price, poor dispersion, polluted working environment

　　 Color sand: better dispersion, less pollution

　　 6, lubricant

　　Lubricant: stearic acid, EBS

　　 Function: Facilitate the operation of processing such as turbine

　　Increase the fluidity of rubber

　　The product has better density and feel

　　7, functional additives

　　 Anti-wear agent: increase wear resistance

　　Anti-slip agent: prevent slipping under low friction conditions

　　 Flame retardant: improve the fire protection effect of products, mainly distinguished by oxygen index

　　Antibacterial agent: improve the antibacterial requirements of products,

　　Antistatic or conductive: mainly used in electronic products