EVA/POE Plastic Film Extrusion Equipment,Application with EVA/POE
1. POE direct modification application
POE direct modification is mainly used in the blending modification of PP and
The cohesive energy of POE is small, and the temperature sensitivity of apparent viscosity is close to that of polyolefin resin. After blending polyolefin, it is easier to obtain smaller particle size and narrower particle size distribution. It is toughened and impact-resistant. The effect is obvious.
POE has been proved to be a better toughening agent for PP. In the PP/POE blend system, POE will form a “sea-island” structure in the continuous phase of PP, which can effectively improve the impact strength of PP at low temperature and normal temperature.
POE directly modified PP is currently its most important market application, mainly for the fields of auto parts, home appliance shells and masks.
POE directly modified PE is mainly used in the field of waterproof membrane and pipe.
PE has high rigidity, poor impact resistance, and low hardness. It must be toughened and modified by adding POE to meet the target performance requirements.
2. Foam modification application of POE
The foaming application of POE is mainly to modify EVA, and EVA is blended with POE foam to make the midsole of sports shoes.
The midsole is the core part of sports shoes. Its role is to provide stability, cushioning and rebound, absorb the impact generated during exercise to provide protection, and bring a relatively mild foot feel.
EVA has good softness and rubber-like elasticity, and is widely used in the midsole of sports shoes.
POE itself can replace EVA alone as the midsole of sports shoes, but EVA has a price advantage (30% lower than the price of POE), so POE is more used as a modified material for EVA.
The product after EVA blended POE foaming is lighter in quality, better in compression and rebound, good in touch, uniform and delicate in cells, and high in tear strength.
3. POE as a single material application
POE is used as a single material, and it is mainly used in the packaging material of photovoltaic modules-adhesive film.
In photovoltaic modules, the adhesive film is placed between the tempered glass/backsheet of the module and the solar cells to encapsulate and protect the cells.
Photovoltaic module structure–Jwell EVA/POE Solar Film Extrusion machine
Due to the irreversibility of the packaging process of solar cells, and the operating life of modules is usually required to be more than 25a, once the light transmittance of the adhesive film decreases or failure problems such as yellowing occur during operation, the solar cells will be scrapped, making the modules unusable , so although the absolute value of the film is not high in the components, its quality directly determines the product quality and life of the components and batteries.
At present, the encapsulation film for photovoltaic modules mainly includes EVA film and POE film. EVA EVA adhesive film is a thermosetting adhesive film with low strength, high water vapor transmission rate and water absorption rate, and poor weather resistance. During normal use, water vapor will still pass through, which will cause the film to atomize and affect the permeability. In addition, the EVA film is easy to decompose and release acetic acid molecules, corroding glass and backplane and other components, shortening the service life of components.
In recent years, in the operation of photovoltaic power plants, it has also been found that there is a serious potential-induced degradation (PID) phenomenon in the EVA film, which leads to a sharp drop in the output power of the power plant.
Compared with EVA film, the biggest advantage of POE film is low water vapor transmission rate and high volume resistivity, which ensures the safety and long-term aging resistance of photovoltaic modules in high temperature and high humidity environments, so that the modules can Long-lasting and efficient use.