What is multi-layer co-extrusion blow molding?

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

Its basic process principle is the same as that of single-layer product blow molding technology. It's just that the molding equipment uses multiple extruders to plasticize different kinds of plastics.

The technical key of multi-layer co-extrusion blow molding is to control the mutual fusion and bonding quality of each layer of plastics. Multi-layer co-extrusion blow molding is a blow molding technology developed to meet the special requirements of packaging containers in some industries such as medicine, food and industry, such as air tightness and corrosion resistance. The following content can help you understand it more deeply.

Multi-layer co-extrusion blow molding features

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

The use of 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 purposes:

Improve the vessel's permeability resistance performance to improve the vessel's strength, stiffness, dimensional stability, transparency, softness, heat resistance, etc., change the surface performance of the vessel under the premise of meeting the strength or performance, reduce the cost.

Material selection for multi-layer co-extrusion blow molding

The development of multi-layer co-extrusion blow molding technology and advanced machines enables the selection of material (layer) combination schemes and the manufacture of blow molding products with desired properties. According to the product capacity range and performance requirements, the structure of 3 to 6 layers can be produced. Generally, a split-type adjustable co-extrusion head and program logic control or microcomputer monitoring are used, so that the multi-layer plastics are evenly distributed according to the selected material amount, co-extruded into a blank, and the parison is top-blown by a mobile station.

When selecting raw materials, different layers should be selected from different materials. The innermost layer and outermost layer should be made of new, high-quality materials. It should be noted here that what material to choose should be based on the final product you make, and the appropriate material should be selected according to its product performance.

Because we are a water tank blow molding machine manufacturer, we need to test the machine. We usually use our machines to produce water tanks during test runs. For water tanks, HDPE is a good choice. We also use HDPE as the raw material of the water tank during production. Most of our customers also use HDPE as the raw material for water tank production. Its performance can make the tank more durable and stronger.

For the middle layer, we can use the residual material left during production or the waste material for secondary use. MEPER blow molding machine equipment cooperates with the brand Siemens. The designed and produced blow molding machine adopts a complete set of original Siemens control system to ensure the stable operation of the blow molding machine. It can automatically monitor and control the entire process and all production equipment.