Post-stretched film is an efficient packaging material, which is gradually favored by people. This article will delve into the concept of post-stretched film, how to use it, and the advantages and disadvantages it brings to help you better understand and choose the type of film that suits your packaging needs.
What is Post-stretched Film?
Post-stretched film, also known as post-stretched packaging film, is a telescopic film that is pre-stretched on the film roll [1]. In the application of the post-stretched film, the film tension creates a tensile effect between the film roll and the packaged goods, which is also known as the “tension on the goods” process. Increasing the tension of the film will enhance the tensile effect.
The advantages of post-stretched film
2.1 Raise the goods to maintain stability
The post-stretched film maximizes the retention of the goods. It makes the goods tightly packed, prevents the goods from loosening or tilting during transportation, effectively reduces the loss and damage of the goods, and ensures the safety of transportation.
2.2 Reduce material waste
Compared to conventional films, post-drawn films require less film length during the packaging process because they have already been stretched during pre-treatment. This means that less film is used during the packaging process, reducing material consumption and thus saving costs.
2.3 Easy to Use
The manual application of the post-stretched film is relatively simple, lightweight and easy to handle. The operator can complete the packaging task without too much physical strength. At the same time, the post-stretched film is lighter, reducing the transportation burden of packaging materials and improving work efficiency.
2.4 High adaptability
Post-stretched film is suitable for all kinds of cargo packaging, regardless of shape and size, and can effectively complete the packaging task. Its plasticity and malleability make it more adaptable to meet different packaging needs.
2.5 Environmental Features
For companies that focus on environmental protection, post-stretched film is a more environmentally friendly packaging choice. Due to its less material consumption and material waste, it helps to reduce the impact on the environment, in line with the concept of green packaging.
The shortcomings of the post-stretched film
3.1 Tension limitations
The tension of the post-stretched film is mainly concentrated in the corners of the goods, and if the tension is set too high, the goods may be damaged or crushed.
3.2 Not applicable to specific products
Since the tensile effect of the post-stretched film depends on the goods themselves, for fragile or specific product packaging needs, the post-stretched film may not be suitable. For example, when packing PET bottles, the stretching process may cause the film to separate from the cargo.
How to use Post Stretch Film?
The key to using Post Stretch Film is to apply the stretching force correctly. In the process of use, the elastic expansion effect of the film can be adjusted by adjusting the size of the tensile force. The greater the tensile force, the greater the telescopic effect of Post Stretch Film. Therefore, to obtain the ideal wrapping effect, it is necessary to flexibly grasp the use of tensile force according to the specific situation.
Comparison of Post Stretch Film and Pre-Stretched Film:
Pre-Stretched Film is another type of packaging film that is pre-stretched before being wound to make the film stretch more ideal. Compared with Pre-Stretched Film, Post Stretch Film focuses more on applying tensile force in the packaging process, so as to achieve cargo retention and stability. Pre-Stretched Film is suitable for manual packaging, while Post Stretch Film is suitable for mechanical packaging, they have different advantages on different occasions.
As an efficient and environmentally friendly packaging material, post-stretched film has many advantages, such as improving the stability of goods, reducing material waste, convenient and easy to use. However, it also has certain disadvantages, especially tension limitations and the problem of not being suitable for specific products. When selecting the packaging film, factors such as cargo characteristics and transportation conditions should be considered comprehensively to ensure that the appropriate film type is selected to meet the packaging needs.
