Author: Site Editor Publish Time: 2021-03-23 Origin: Site Inquire
Application of multi-layer Coex technology in blow molding machine industry
hollow extrusion blow molding machine
Hollow extrusion blow molding equipment is to feed raw plastic material such as HDPE (High density Polyethylen), PP (polypropylene), PVC( Polyvinyl chloride) etc. through extruder for melting preform into forming mold, then use the compressed air to deform the blank along the die cavity. It is cooled quickly and shaped from the die to blow the hollow bottles with short neck. Hollow extrusion blowing machine is a fast developing plastic molding method at present.
Application scope of hollow extrusion blow molding machines
Extrusion blow molding machine, originated in 1930, today already involved in various industries. Blow molding technology and equipment cost is relatively not high, and the advantage is that it can form complex hollow products, then what sort of fields our extrusion blow molding machines are applied?
Chemical industry package
-Industrial chemical bottles/jerry can/ drums etc.
-Lubrication oil jerry can 1L/2L/4L/5L
-engine oil jerry can 1L/2L/5L/30L/60L/220L
-220L chemical drum etc..
-flexible oil hose
Daily chemical bottle
洗发瓶 shampoo bottles
沐浴露瓶 bath bottle
护肤瓶 skin care bottle
强力去污瓶 decontamination bottle
洗涤精瓶／洗衣液瓶detergent bottle/can jerry can
洗厕液瓶 toilet liquid bottle
消毒液瓶 disinfectant bottle
消毒纸巾桶 sterilized tissue barrel
3. 农用化工桶&瓶 farming chemical bottle/jerry can
农药瓶／桶 Pesticide bottle/jerry can
4. 医药化工瓶 medical chemical bottle/jerry can
眼药水瓶（LDPE）eye drop bottle
废弃物瓶／桶 waste material bottle
二、食品包装 food package
1. 牛奶瓶 milk bottle
2. 果酱瓶 ketchup bottle/ juice bottle
3. 罐头瓶 preserved can bottle/can
4. 食用油桶 edible oil jerry can /bottle
Auto car part
Auto car oil tank
Auto car water tank
Auto car air intake hose
Children toy plastic products
Ocean sea ball
Folating sea products
road block tube
Water pot/ jerry can/ bottle
（LDPE）Soft water bag
Garden spray watering can
1handle type water tank
long neck single color/double color pot
water storage tank (big)
Plastic model for shop
half body size
Multi-layer coex blow molding machine application
Multi-layer coextrusion blow molding machine adopts different extrusion system to produce multi-layer plastic bottles. Normally 3 necessities:
Decrease the oxygen permeability, such as food preserve can and juices bottles etc.
Improve the impermeability, such as pesticide bottles and jerry can;
Improve the beauty of the surface, such as daily chemical bottles, adding pearl powder on the out layer to form bling pearlescent feeling.
produce one transparent line on un-transparent bottle for observing the level of liquid inside.
Once plastics are synthesized, no way to turn back! In the past 50 years, the global production of plastic has been increased by 20 times and caused 7 billion tons of plastic waste which is named “ white pollution”. At present, there are 120 million tons of disposable plastic products in the world yearly, of which only 10% are recycled and about 12% are burned, other more than 70% are discarded in soil, air and sea. The most important reason to cause “white pollution” is the chemical properties of plastics, such as polyethylene, which are difficult to be digested and degraded. On October of 2020, the European parliament approved to ban the use of disposable plastic products from 2021, in order to reduce the increasingly serious pollution of plastic material. Under this situation, reusing PCR (Post customer recycled) plastic material is urgent. One real situation is that many plastic bottle producer are trying to replace their single-layer extrusion blow molding machines by multi-layer machines.
3.Combination of function necessities and environmental demand
Except for food container, all hollow blow molded products can add a recycle layer to the original more single-layer or multi-layer functional plastic products. The conventional method is to include the recycle layer, but the current trend is that the recycle layer is in the middle.
50ml,100ml,200ml,500ml,1L (round bottle)
2L, 5L, 10L (with handle) The handle is blown separately and specially, so that it can pass the drop test smoothly (1M-1.2M)
3 layers: outer layer new material / middle layer adhesive / inner layer barrier layer EVOH or PA 85%/5%/10%
4 layers: outer layer new material/secondary layer recycled material/secondary layer adhesive/inner layer EVOH or PA 25%/60%/5%/10%
5 layers: outer layer new material/second outer layer adhesive/intermediate layer barrier layer EVOH or PA/secondary inner layer adhesive/inner layer new material 40%/5%/10%/5%/40%
6 layers: outer layer new material/second outer layer recycle material/middle a layer adhesive/middle b layer barrier layer EVOH or PA/secondary outer layer adhesive/outer layer new material 20%/40%/5%/10% /5%/20%
Food bottles (canned bottles, ketchup bottles)
5 layers: outer layer new material / secondary outer layer adhesive / intermediate layer EVOH or PA / secondary inner layer adhesive / inner layer new material
Environmentally-friendly multilayer blow molding products and corresponding equipment
In addition to food packaging bottles, bottles and cans, all other products listed above can be added with a recycled material layer. The specific plan:
Double layer: new material on the outer layer/recycled material on the inner layer: 20%/80%
Three layers: new outer layer/returned middle layer/new inner layer 20%/60%/20% or 30%/40%/30% or others
Our advantages in multilayer blow molding equipment
Since 2006, we have officially started to produce multi-layer hollow blow molding machines. We have more than 10 years of experience in manufacturing multi-layer co-extrusion equipment. Extrusion die poem is one of the most important parts that determine the quality of blow molded products. All die heads of our machine are independently developed, processed and assembled independently.