Best Gold Pearlescent Pigment Solutions


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Fumin Road 399
223800 Suqian, China

 


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Plastic Extrusion

Plastics extrusion is a continuous manufacturing process for producing high volumes of a plastic profile by which raw plastic material is melted and forced under considerable pressure through a die having the shape of the desired profile. Plastic extrusion is utilized to produce items such as pipes or tubing, fencing, deck railings, window frames, plastic films and sheeting and wire insulation.

 

For the extrusion of plastics the raw compound material is in the form of what are called “nurdles” (small beads or pellets which are often called “resin” in the industry) which are in a top mounted hopper and are gravity fed into the barrel of the extruder which contains a rotating screw which forces the plastic beads into the heated barrel where they are melted.

 

Additives such as colourants, UV inhibitors and effect pigments are often used and can be mixed into the beads prior to arriving at the hopper which then is called a “Masterbatch”. It’s important to understand effect pigments differ substantially from organic pigments as effect pigments are comprised of non-homogenous individually structured platelets within a set range of sizes which give the pearlescent effect as opposed to organic pigments which are a homogenous mass which retains its colour no matter how finely its ground. Therefore when using effect pigments care must be taken with the mixing and the extrusion process such as screw speed and filters to not damage the effect pigment platelets from exerting excessive shear force which will dramatically reduce the pearlescent lustre effect.

 

The plastic extrusion process has much in common with plastic injection molding from the point of view of how the plastic is fed into the machine but differs as injection molding is not a continuous process while plastic extrusion is a continuous process.

Pritty’s effect pigments are well suited to the plastic extrusion process, since the plastic extrusion process ensures the effect pigment platelets are perfectly aligned to the surface which is critically important for the maximum pearlescent optical effect.

 

Plastic co-extrusion is also well suited for use with Pritty effect pigments. The co-extrusion process is where multiple layers of plastic material are extruded simultaneously by utilizing two or more extruders to melt and deliver a steady volume of different plastics to a single extrusion head (die) for the desired shape or form. Co-extrusion is often used for example where as the only the thin transparent or translucent top outer layer contains Pritty effect pigments while the opaque bottom layer is for the colour and strength of the extrusion. This is an economic efficient option of having Pritty effect pigments only at the transparent or translucent surface of the plastic extrusion rather than throughout the entire plastic profile where light cannot penetrate so they cannot contribute to the pearlescent effect. In this way when using Pritty effect pigments co-extrusion is a good solution for combining high coverage, excellent pearlescent effects and good economy with minimal wastage of the effect pigments.