Key technology of PET recycling

The recycling method of PET is generally divided into physical and chemical methods, many foreign companies use chemical method, but because of its high cost, the application of the technology in China has been limited. In this paper, the technology content and process of recycling method are combed, and the hope it is helpful to the enterprise friends of the majority of renewable polyester industry.

Degradation method
There are two methods of PET synthesis: one is the condensation reaction of (TPA) and ethylene glycol (EG); one is the exchange reaction of two methyl terephthalate and EG. These two reactions are reversible reaction, under the action of excess water or alcohol, the reaction can occur under certain conditions, so that the PET can be decomposed into single or oligomers, and the use of monomer to synthesize food grade PET resin.
Hydrolysis method
Hydrolysis is under a certain temperature and pressure, in different pH solution as the medium, bottle feed pet hydrolysis diacids and diols, general hydrolysis method must be treated with mechanical method, removal of impurities, the technology is complex, cost recovery is relatively high, and the impurity induced accumulation. TPA and EG are one of the important methods for the production of PET, which is a important method for the production of polyester. The PET hydrolysis method has been paid more and more attention. According to the different pH value can be divided into: neutral hydrolysis, acid hydrolysis and alkaline hydrolysis.

Then the physical recycling method
GREENMAX provide a new way: POSEIDON Series could do the PET bottle dewatering work for all kind of beverage with the package of plastic bottles like PET bottles, carton box, aluminum cans, etc.
The process is:
Empty plastic bottles are collected and taken to a Materials Recovery Facility, where they are separated from your other recyclable materials.Then,.The bottles are squashed, baled and sent to the reprocessing company.Later on,The bottles are dry cleaned and sorted using an optical beam which separates the different types of plastic.Last,.The bottles are then ground into flakes which are washed and sorted again. Depending on the kind of plastic, the flakes are either decontaminated using a chemical solution or melted down and sieved to form beads as the plastic cools.These beads and flakes can be melted down again and turned into new products. This can include packaging, drainage pipes, garden furniture or simply new plastic bottles.

Key steps in the recycling process of waste EPS foam


In the process of separation, the effect of different plastic mixing granulation on the properties of recycled materials is to be removed, and the physical and chemical properties of the recycled plastics can be recycled. Sorting process is mainly divided into different types of waste foam plastics. In this process to identify the type of material to be identified, to distinguish between the PS waste foam and PE, EVA-PS and other waste foam, containing the flame retardant and non – containing foam, impurities and impurities less waste foam, different foam separation process. Such as packaging materials should be treated with clean appliance recycling materials and disposable lunch boxes more oil separately.

At present, it is widely used in the separation of artificial and solution density. And new separation technology such as electrostatic separation, magnetic separation, cyclone separation, centrifugal separation, hydrocyclone is rinsed in water and also has the new progress and breakthrough.

Crushing, washing

After separation of the large pieces of foam, we need to smash into a small diameter of 1cm around the mill, to feed into the extrusion machine for production. Large pieces of foam and first mill waste foam into 1cm pieces, and then by the fan through the conveying pipeline sent to clean the sink, sink in the rotary slide in the rotating process churning debris and push the debris to continue moving forward. Wash the sink generally from two to three in series, after a number of washing tank washing, the surface of the plastic foam residue was washed. For the part of the household electrical appliances packaging material can be crushed directly.

Deaeration, drying

After washing the foam debris into the cyclone dehydration machine, the foam debris can be directly took into the extruder, but the density of the debris is small, and the water content is relatively large.

EPS melting and recycling


After drying granular foam debris was mostly round granular, then can greatly improve the yield of granulation.

Extrusion and granulation

Extrusion process for foam debris into the extruder followed by feed section, compression, metering section after the filter to reach the die.

Extrusion granulation process is one of the key steps in the process of waste styrofoam recycling. The traditional extrusion granulation process for the use of double stage single screw extruder, there has also been a forced feeding low shear and low degradation of single screw extrusion granulation, integration of extrusion granulation and twin-screw modified extrusion granulation and other new recycling equipment and recycling process.

styrofoam compactor blocks

At present, there are some limitations on the physical properties of the materials produced by the simple recycling granulation, which limits its application scope. The new technology applied to the styrofoam recycling process can improve the performance of the recycling materials, expand its application range, so that the use value of the recycling materials has been greatly improved. The main raw material of the double screw extrusion granulation is the waste EPS foam as the main raw material, adding various additives in the process of extrusion granulation to achieve the purpose of giving the new performance of the material.

However, the modified granulation can only be used in the process of the PS particles with high density and high density of EPS after being melted or hot compress, and the particles are modified by recycling.

Particle and application of traditional recycling process

After the traditional recycling process, the EPS regeneration particles produced by the two – order single screw extrusion granulation equipment can be divided into the mixed particles of light colored translucent particles, opaque particles and a small amount of impurities. The high purity of the light colored translucent particles and opaque particles is mainly used for making XPS extruded plate, EPS photo frame, polystyrene foam architectural decoration materials, such as the high requirements of the appearance and performance of the raw material products. Recycling particles containing impurities or mixed with other plastics have poor mechanical properties and can only be used for the production of low-grade molded articles.

American Industrial Rubber Products Demand Maintained Rapid Growth

According to the industrial market research company Freedonia group’s latest forecasts, America’s industrial rubber products demand will reach 24.4 billion dollars by 2019. The construction market with rubber products and with the most rapid development, and the roof with a rubber products and other construction related products is expected to obtain the healthiest growth at a high speed.


Mechanical rubber products will continue to occupy the largest market share. However, sales growth rate is expected to be lower than other areas. Rubber pipe and duct tape suppliers will benefit from the machinery of the durable goods exports growth overall. Due to the development of mechanical products and nonresidential construction industry, industrial rubber products demand will maintain rapid growth. The output growth of cars will also provide new sales growth, compared to the rapid growth of exports will slow significantly. In addition, these products will continue to face various applications in the field of plastic products at lower prices.

Waste Recycling Polystyrene Foam Profiles

Polystyrene (PS) foam insulation has excellent long-lasting, unique cushioning shock resistance, aging resistance and water resistance. So the construction, packaging, electrical and electronic products, ships, vehicles and aircraft manufacturing, decoration fields materials, housing construction has been widely used, which greatly facilitated our lives.


But more than 50% of electrical and electronic damping packaging, fish boxes and other fresh produce packaging, namely abandoned as useless junk because PS foam resistant has bacteria resistance, weather resistance, corrosion resistance, under aerobic state 300 years to completely degrade. A lot of waste PS foam scattered in the natural environment, affects the living environment of our planet white pollution, on the ecological environment caused great damage.So since the 1980s, the eight states of the United States, Japan, Korea, Taiwan Province of China and other countries and regions have legislation prohibiting or restricting the use of polystyrene foam tableware.


Countries through continuous exploration and practice, and technological progress and innovation, and gradually solve the problem of recycling waste PS foam, making large-scale recycling of waste PS foam become polystyrene foam production of about 12 million tons every year throughout the world. China produce about 1.8 million tons per year, except for a few of countries, and other countries’ waste PS foam has not been effectively recovered.


According to incomplete statistics, the Nordic countries and Japan PS foam recycling utilization rate of 72% and Korea PS foam recycling utilization rate was 64%, while the remaining countries and regions PS foam recycling rate is only 10% to 30%.

In China, the recovery mechanism is not perfect, so 70% of PS foam is buried or burned, and only about 30% is recycled. The majority of the waste polystyrene material has not been effective recovery and utilization, causing serious environmental pollution. Severe resource crisis and environmental pollution, forces us to increase the recycling and reuse of resources and green development cycle of recycling.

Styrofoam Recycling Become Hot Topics among Related Enterprises

Most of the waste styrofoam is disposable. Millions of tons of waste are thrown into nature and they are neither discomposed nor transformation. The foam can not disappear themselves, which will lead to serious environmental pollution. In addition, they are a valuable non-renewable resources. So how to effectively recycle waste polystyrene foam has attracted widespread attention of national research workers.


Current methods for waste recycling styrofoam is to crush, melt regeneration granulated particles of another material, and then adding the adjuvant are processed into another material. However, in the production of plastic granules, making such methods not completely crush the present raw materials, and melting temperature control is uneven, while unavoidable impurities mixed in the raw material, which leads to low productivity, and because the present impurities can result in equipment damage.


Polystyrene current situation can only be used one time, which caused a great burden to the environment, so the new way of recycling is imminent.

Waste polystyrene foam is defined by the styrene monomer by free radical polymerization of synthetic polymers. It is a colorless, transparent thermoplastic, has a higher glass transition temperature of 100 ℃. It is often used to make a variety of needs to withstand the temperature of boiling water disposable containers, and disposable foam lunch boxes.


Because of its good water resistance, insulation resistance, insulation resistance, low moisture absorption and strong seismic strength, its light weight, rugged, easy to shape, low prices, is widely used in packaging, moisture, water, every heat, shock, decorating, catering and other fields penetrate all sectors of the national economy.

Styrofoam Board Construction Process Brief of Advantages and Polyethylene Foam

Styrofoam density is coefficient with good impact resistance, which have the ability to respond by changing the shape of the outside world and to buffer the impact.

Has an independent bubble structure, and a small area of damage will not affect the entire surface of the wall.

The surface with low water absorption, good anti-permeability, can effectively avoid the damp moldy walls or fall off the wall question.


Won’t be influenced by the air temperature. At high temperature, polystyrene foam board won’t be melted and flow. Also, it will not happen because the temperature is too low at low temperature embrittlement phenomenon.

Styrofoam is recyclable material that can be recycled, and the extent of recycling of plastic in the highest.

The production process does not use Freon.

Energy consumption in the whole life cycle of plastic products in the lowest.


Polyethylene foam board construction craft disadvantages:

The construction needs linked network with construction process cumbersome and long duration.

Flammable, poisonous gas after combustion. Common polystyrene foam insulation board is easy to burn. Toxic smoke produced by combustion, the combustion could still reach B grade even after adding a flame retardant.

Material strength is poor. Prone to cracking and insulation shedding phenomenon is relatively common.


Polystyrene foam insulation board need to enhance in the process because its limited strength, and load-bearing ability.

Unstable polystyrene foam insulation board quality because the material needs a period of time before being transported from factory. It can be used after a period of maturity. Quality will not be guaranteed if uncured complete, and leads to shrinkage and cracking foam board.


Waste Styrofoam Have Attracted Attentions of Countries All over the World

Most of the waste styrofoam is disposable, millions of tons of waste white trash are thrown into nature. But Styrofoam is difficult to decompose, so Styrofoam will have heavy pollution on the environment and waste non-renewable resources. How to effectively recycle waste polystyrene foam has attracted widespread attention of national research workers.


Current methods for waste Styrofoam recycling is to crush, melt regeneration granulated particles of another material, and then adding the adjuvant are processed into another material. For the common method of recycling is to handle plastic foam by crushing, melting, bracing, cut type and so on. But in the production of plastic granules will not completely crush the presence of raw materials, melting temperature control uneven. And unavoidable impurities mixed in the raw material, which could lead to low productivity, and impurities can result in equipment damage.


Styrofoam current situation can only be used one time and can cause a great burden to the environment, so the new way of recycling is imminent.

Waste Styrofoam is defined by the styrene monomer by free radical polymerization of synthetic polymers. It is a colorless, transparent thermoplastic, which has a higher glass transition temperature of 100℃. It is often used to make a variety of needs to withstand the temperature of boiling water disposable containers, and disposable foam lunch boxes.

Dangote Group Plans to Expand the Production of Polyolefins in Africa

Manish Singhvi, general manager of the African diversified conglomerate Dangote Group, responsible for strategic planning, recently said the company is planning to build a $ 4 billion petrochemical complex project in the vicinity of the Lekki Lagos, Nigeria. This includes a mix raw materials of 1.1 million tons/year of ethylene and 350,000 tons/year of propylene cracker. All the propylene produced 1.7 million tons/year will be used in polypropylene production plant.


It is reported that the company also considering building a metathesis unit will increase propylene production capacity of another 600,000 tons/year. Meanwhile, the refinery project will produce 750,000 tons of propylene/year. Thus, propylene total capacity is up to 1.7 million tons of propylene/year. Dangote also plans to build two downstream polyethylene (PE) production plant, and each PE production capacity is about 550,000 tons/year, which is a high-density polyethylene production, and another is a set of linear low density polyethylene.

Dangote has determined that all the devices are made of Ineos polyolefins technology. The petrochemical plants produced about 20% will be used for polyolefin local market and 80 percent for export.

INTCO Huge Greenmax Crusher for PE Foam Have a Test in the Factory

The picture above is the Greenmax foam crushe and you could see the huge machine:


huge foam crusher


Recently, INTCO factory is busy as a huge foam crusher has been produced and we are having a test. As is known, waste PE foam is lightweight and large in size, but Greenmax crusher could smash them into granules as much as possible.


throwing eps
Throwing waste foam into the crusher with machine help:
eps throwing process
It is estimated that the capacity of the Greenmax foam crusher is about 1.2 ton after the test.
The handling result can be seen in the picture:


foam pellets

Plastic Bags Use Methods in Different Countries

Plastic limit has been dominated by the news of hotspot locations around China in the plastic limit after seven years. As a result, the effect is not ideal. How can really reduce the use of plastic bags? We use plastic bags under inventory abroad and it may be able to provide reference.

Germany: most stores allow consumers to choose whether to use a plastic bag or a canvas or cotton cloth shopping bags. Plastic bags according to size and costs, ranging from 0.05 euros to 0.5 euros, to provide consumers with a plastic shopping bag stores need to pay back fees.

Ireland: From the beginning of March 4, 2005, for each plastic shopping bag levy 13 cents of tax funds received include all environmental protection fund for environmental protection projects, a plastic bag usage dropped 90%, the tax also raised a substantial amount of money for Ireland’s environmental project.

South Korea: No matter how expensive you buy at the mall, the mall will not gift shopping bags. If consumers do not bring their own bags, you have to spend money to buy plastic bags. Stores will recover the original price, and customers can also take the old bags to the store or supermarket bags renewal. Since 1999, plastic bags usage have reduced by 60% after the implementation of charging for shopping bags.

Japan: “Containers and Packaging Recycling Law” stipulates that the amount of packaging materials used content is more than 50 tons of supermarkets, convenience stores and other retail outlets. The obligation to develop autonomous reductions target shopping bags and wrapping paper and report every annual results reduction. If found inadequate measures merchants will announce its name, the environment minister has the right to impose ¥500,000 businesses fine. Many retail outlets begin to provide paid shopping bags and encourage customers to bring their own reusable shopping bags.