Nowadays literally all humankind use plastic products 24/7 all over the world. It is super easy to get access to all kinds of plastic products. You might have come across bottles that have a shiny layer on the outer side, or different colours on the outer and a different one in the inner. So, what it is? It is a multilayer extrusion product. Well, let me explain to you how what it is exactly.

Multilayer extrusion blow moulding is the same technology as making a hollow container by blowing air into it. It uses more than two extruders to melt and plasticize the same or different plastics in different extruders. And then compounding, extruding and forming multi-layer concentric composite parison in the die. Its basic process principle is the same as the single-layer blow moulding technique. Only the moulding equipment uses several extruders to plasticize different kinds of plastics. Control of the integration and bond quality of plastic layers is the key to the multilayer co-extrusion blow moulding technology.

Multilayer co-extrusion blow moulding is developed to meet the needs in some industries with some special requirements. Such as the airtightness and corrosion resistance in pharmaceutical, food, and industry.

The following content will help you understand this technology better.

Multilayer Co-Extrusion Blow Molding Characteristics

Multilayer co-extrusion blows moulding hollow products are produced by extruding several different raw materials into hollow products through a multi-layer die head. To achieve the barrier performance of the container to external substances. Adopt coextrusion blow moulding, compound a variety of polymers together. Forming the multi-layer containers.

The advantages can be summarized as follows:

Improve the performance of the products. Such as strength, stiffness, softness, heat resistance, transparency and size stability. Improve the surface performance of products. No stripe, no speckle, no scratch. More smooth, cleaner.

Multilayer Co-Extrusion Blow Molding Material Selection

The development of multilayer co-extrusion blow moulding technology and equipment makes it possible to choose the best material combination plan. And this also realizes the production of ideal performance blow moulding products.

According to the production capacity range and performance requirements, this technique supports 2 to 7 layers of production. The no of layers increases depending upon your combinations of adhesive and barrier layer. When choosing material, the different layers should choose different materials. The inner layer and outer layer, choose all-new material, which is of high quality. Attention here, you should according to your production needs to choose suitable raw material.

Because we’re a water tank blow moulding machine manufacture, we usually produce a water tank by our machine to test it. For the water tank, HDPE is a good choice. We also use it. Most of our customers also choose HDPE. Its performance makes the blow moulding products more durable. And the intermediate layer, you can use waste material.

Multilayer Co-Extrusion Blow Molding Advantage

1. It provides higher quality blow moulding products under a more broad width and linear velocity.
2. Fill low-cost material. It can save high-quality resin. Recycling use of raw materials. Save the material cost.
3. Improve production efficiency.
4. The products under this technology are durable, more stable, the quality is higher.
5. Multilayer co-extrusion blow moulding products usually have high chemical resistance (oxidation resistance, light ageing resistance), harmful substance penetration resistance, odour migration resistance, compression resistance, impact resistance, smooth surface, heat resistance, and surface scratch prevention.

Multilayer Co-Extrusion Blow Molding Application

Food and Beverage

Packaging of tomato sauce, rapeseed oil, jam and milk, orange juice, carbonated beverage, beer, etc.
Multilayer co-extruded bottle products have three layers, five layers, and six layers. There are more plastic bottles with six layers of general materials.

Chemical Reagents

This kind of product usually consists of a three-layer combination, four-layer combination, five-layer combination, the six-layer combination of 5-10L barrels, plastic bottles below 1L, etc.

Industrial Buckets:

Industrial containers for storing and loading various liquids.
In addition to common water tanks, there are IBC buckets, double-ring buckets, and so on.
Industrial containers usually need to have certain impact resistance, and the characteristics of multi-layer co-extrusion blow moulding technology determine that multi-layer blow moulding products have a certain impact resistance.

Others:

Packaging in medicine and cosmetics

Tips:

Multilayer co-extrusion blow moulding technology is certainly advanced. But only when it is applied reasonably can its advantages be brought into full play.
When we use this technology, we should ensure the stability of each performance. Operate it in standard steps.

Based on the stable development of this technology, the application scope of the equipment should be widened as far as possible.

That’s all, the detailed introduction of multilayer co-extrusion blow moulding is ending here.