Multilayer co-extrusion blow molding

What is multi-layer co-extrusion blow molding?

What is multi-layer co-extrusion blow molding?  Multi-layer co-extrusion and blow molding is the technology of making hollow containers by blow molding by using more than two extruders to melt and plasticize the same or dissimilar plastics in different extruders and then compound, extrude and form multi-layer concentric composite embryos in the head.

The basic process principle is the same as blow molding technology for single layer products.  But the molding equipment adopts a plurality of extruder respectively plasticizing different varieties of plastic.

The key technology of multilayer co-extrusion blow molding is to control the fusion and bonding quality of each layer of plastics.  Multi-layer co-extrusion blow molding technology is developed to meet the special requirements of some industries such as medicine, food and industry for packaging containers, such as air tightness, corrosion resistance and so on.  The following sections will help you understand it more deeply.

Multi-layer co-extrusion blow molding characteristics

Multi-layer co-extrusion blow molding hollow products are made of several different raw materials by multi-layer die head, so as to achieve the barrier performance of the container to carbon dioxide, oxygen or gasoline.

Using co-extrusion blow molding, a variety of polymers composite together, forming a multi-layer container, in the comprehensive advantages of a variety of polymers, can achieve the following objectives:

Improve the impermeability of the container to improve the strength, stiffness, dimensional stability, transparency, softness, heat resistance of the container, change the surface performance of the container to meet the premise of strength or performance, reduce the cost

Multilayer co-extrusion blow molding

Multilayer co-extrusion blow molding material selection

The development of multi-layer co-extrusion blow molding technology and machine make it possible to select the material (layer) combination scheme and manufacture blow molding products with ideal properties.  According to the product capacity range and performance requirements, can produce 3 ~ 6 layers of structure.  Generally, the jointing adjustable co-extrusion machine head and program logic control or computer monitoring are used to distribute the multi-layer plastics evenly according to the selected amount of materials, and co-extrude them into billets, which are formed by top blowing at mobile stations.

When selecting raw materials, different layers should be made of different materials.  Use new, high quality materials for the inner and outer layers.  Note that the choice of materials should be based on the final product you make, according to its product properties to choose the appropriate material.

As we are a manufacturer of blow molding machines for water tanks, we need a trial machine.  We usually use our machines to produce water tanks when we test them.  For water tanks, HDPE is a good choice.  We also use HDPE as the raw material of water tank in production.  Most of our customers also use HDPE as the raw material for water tank production.  Its properties can make the tank more durable and robust.