A low-melting EVA bag can become part of the production process. In a properly selected process, the package can be introduced together with the batch without being removed first.
What is low-melting EVA film?
EVA is an ethylene-vinyl acetate copolymer. Its thermal and mechanical properties vary with composition and grade, so not every EVA film should be treated as a material with one identical operating temperature.
For PakTech low-melting EVA solutions, the typical melting temperature is close to 73°C, with a characteristic range of approximately 71–76°C. Suitability for a specific process should nevertheless be verified in practice.
How does a batch inclusion bag work?
With conventional packaging, the package must be removed before the material is added to the process. EVA bags can be selected so that, under appropriate conditions, they enter the process together with their contents. This reduces manual unpacking and operator contact with the batch material.
The concept is particularly well established in rubber processing, where pre-weighed ingredients are introduced into a subsequent mixing stage.
Temperature matters, but it is not the only parameter
Selection should consider more than melting temperature. Process temperature profile and duration, mixing method, the amount of film relative to the batch, compatibility with the formulation and final-product requirements may all be relevant.
For this reason, a trial in the customer's real process is normally the best step before implementation.
Where else can EVA be used?
Beyond rubber processing, EVA films can be considered in plastics processing, as a bonding layer in laminated structures and as a separating or technological layer in other industrial processes. One example is the use of wide EVA rolls as interleaves in an aluminium-related production process.
What should an enquiry include?
- description of the process and product,
- process temperature or temperature range,
- required format: bag, tubing, flat film, sheet or roll,
- dimensions and thickness,
- approximate quantity,
- whether the film is intended to enter the process together with the contents,
- where possible, a sample of the currently used material or process documentation.
Why is a trial important?
Technology processes differ in temperature, time, formulation and machine operation. Even if nominal data appear suitable, a real-process trial confirms how the film behaves and whether the solution has any unwanted effect on the product.