Stretch wrap film, also known as wrapping film, winding film, stretch film, is widely used in logistics, moving, warehousing and other fields for bundling and wrapping goods. However, in some cases, users may find that the transparency of stretch film is insufficient, which affects the using experience. Next, stretch wrap film manufacturers provide detailed information and some suggestions for improvement.
5 reasons for the lack of transparency of stretch film
Raw material quality
The main raw material of stretch film is polyethylene (PE) resin, which is transparent by itself, but if it is added with additives such as filler and masterbatch, it will reduce the transparency of the film. Therefore, choosing high quality raw material is the key to ensure the transparency of stretch film.
Production process
Production process also affects the transparency of stretch film. Incorrect production parameters or process flow may lead to uneven crystallization or rough surface of the film material, which may affect the transparency of the film. For example:
(1) The inlet temperature of the drying channel is too high or there is no temperature gradient. The inlet temperature is too high and the drying is too fast, so that the solvent on the surface of the adhesive layer evaporates rapidly and the surface crusts, and then when the heat penetrates deep into the inside of the adhesive layer, the solvent under the skin film vaporizes and breaks through the adhesive film to form the ring like the volcano vents, one after the other, which also makes the stretch wrapping film not transparent.
(2) The amount of adhesive on the winding film is not enough, there are blanks and small air bubbles, resulting in spots or opacity, the amount of adhesive should be checked so that it is enough and even.
Equipment Problems
The production equipment of stretch film may also have problems, such as unstable performance of the extruder or stretching machine, unreasonable design of the mold, defective rubber rollers or doctor blades, no spreading rollers or unclean spreading rollers, etc. These problems may lead to the processing of film material. These problems may result in uneven or damaged processing of the film material, which in turn affects the transparency of the film. Therefore, regular inspection and maintenance of production equipment is the key to ensure the stable quality of stretch film.
Production workshop
There is too much dust in the air of the production workshop, and there is dust in the hot air blowing in the drying channel after gluing. It sticks on the surface of adhesive layer, and when it is compounded, it is sandwiched in the middle of two pieces of base films with many small dots, resulting in opacity.
Improper storage conditions
Stretch wrapping film should be stored in a cool, dry and ventilated place, avoiding direct sunlight and rain. If the storage conditions are not proper, it will accelerate the aging of the film and lead to the decrease of transparency.
How to improve the transparency of stretch film
- Choose high quality raw materials: Choose high quality PE resin and additives, which can improve the transparency of stretch film.
- Optimize the production process: Optimize the parameters of film blowing, cooling speed and other process conditions, which can improve the transparency of stretch film.
- Improve storage conditions: Stretch film can be stored in cool, dry and ventilated place, avoiding direct sunlight and rain, which can prolong its service life and keep good transparency.
Conclusion
The above content is the detailed introduction of the reasons for the lack of transparency of stretch film, and we must have some understanding of it. Users should pay attention to choosing a reputable manufacturer when selecting and using stretch wrap film, and understand the correct storage method to ensure the transparency and service life of the film.