The Puncture Resistance Performance of The Packaging Film of The Transparent Film Three-dimensional Packaging Machine

The puncture resistance performance of the packaging film of the transparent film three-dimensional packaging machine is a key factor affecting the packaging quality and product protection effect. The following is an analysis from three aspects: its importance, influencing factors, and improvement strategies:

The importance of puncture resistance

The puncture resistance of packaging film refers to its ability to resist being pierced by sharp objects. During the packaging process, especially for products with sharp edges or those that may carry sharp foreign objects, insufficient puncture resistance can lead to the film being punctured, which in turn causes problems such as leakage of the contents, moisture absorption, and contamination, seriously affecting the quality and safety of the products. Therefore, ensuring that the packaging film has sufficient puncture resistance is an important consideration in packaging design.

Factors affecting puncture resistance performance

Film material and structure:

The puncture resistance performance of films made of different materials varies significantly. For instance, nylon (PA) film, due to its high strength and toughness, has better puncture resistance than polyethylene (PE) film.

The puncture resistance of the composite film not only depends on the strength of the single-layer film, but is also closely related to the combination mode, thickness ratio and bonding strength of each layer of film. For instance, the puncture resistance strength of BOPA (biaxially oriented nylon) and PE composite films is usually higher than that of single-material films.

Film thickness:

Generally speaking, as the thickness of a film increases, its puncture resistance will also improve. However, an increase in thickness may lead to a rise in cost and a decrease in flexibility, and a balance must be struck between performance and cost.

Additives and modification treatment:

Adding additives such as calcium carbonate can improve the physical and mechanical properties of the film and enhance its puncture resistance. However, the amount of additives added must be strictly controlled to avoid affecting other properties of the film (such as transparency and flexibility).

The puncture resistance of the film can be significantly improved through process modifications such as biaxial stretching. For instance, the puncture resistance strength of BOPP (biaxially oriented polypropylene) film is higher than that of ordinary CPP (cast polypropylene) film.

Environment and usage conditions:

Humidity and temperature have a significant influence on the puncture resistance of the film. For instance, when nylon membranes get damp, their barrier properties, puncture resistance and processing adaptability will all decline.

During the packaging process, the film may be subjected to stress such as stretching and folding, resulting in the appearance of local weak points and reducing its puncture resistance.

Strategies for improving puncture resistance

Optimize material selection

According to the product characteristics and packaging requirements, select film materials or composite film structures with excellent puncture resistance. For example, for the packaging of sharp objects, nylon-based composite films can be given priority.

Control the film thickness:

Under the premise of meeting the requirements of puncture resistance performance, the thickness of the film should be reasonably controlled to reduce costs and maintain flexibility.

Improve processing technology

By adjusting process parameters such as the tensile ratio and temperature, the crystalline structure and orientation degree of the film are optimized to enhance its puncture resistance.

In the production of composite films, it is necessary to ensure the bonding strength between each layer of the film to avoid the decline in puncture resistance caused by delamination.

Strengthen environmental control

During the processing and storage of films, the temperature and humidity in the workshop should be strictly controlled to prevent the films from getting damp or contaminated by corrosive gases.

Conduct performance testing and verification:

According to relevant standards (such as GB/T 10004-2008 "Dry Lamination and Extrusion Lamination of Plastic Composite Films and Bags for Packaging"), the puncture resistance performance of the film is tested and verified to ensure that it meets the packaging requirements.