Vacuum Packaging Multilayer Medium Barrier Film Manufacturers

How to ensure the thickness uniformity of multi-layer medium barrier films for vacuum packaging? Are there performance differences caused by uneven thickness? How to measure and adjust the thickness?

Ensure the thickness uniformity of multi-layer medium barrier films for vacuum packaging
Single-layer film quality control:
We strictly control the thickness and uniformity of the single-layer film before the vacuum packaging bag is compounded, which is the prerequisite for obtaining qualified finished product thickness quality. In the production process of single-layer film, we use advanced production equipment and technology to ensure that the thickness of each layer of film is within the preset tolerance range and is evenly distributed.
Composite process optimization:
Compounding is a key step in forming multi-layer barrier films. We continuously optimize the composite process, including the setting of parameters such as glue coating amount, composite pressure, and composite temperature to ensure the close bonding between multi-layer medium films while avoiding uneven thickness.
Tension and winding control:
During the production process, we strictly control the tension of the film to ensure that it does not deflect or stretch during the transmission process. We use advanced winding equipment and technology to ensure that the tension of the film remains constant during the winding process to avoid uneven thickness.
ERP management system and network tracking:
We fully implement the ERP management system and network tracking information of the production process. By real-time monitoring of various data in the production process, we can promptly discover and correct problems that may cause uneven thickness.
Performance differences caused by uneven thickness
Barrier property differences:
The barrier property of vacuum packaging bag film is closely related to the thickness of the multilayer film. If the thickness is uneven, the barrier property of the film in different parts will be different, thus affecting the shelf life and safety of the product.
Degradation of mechanical tensile properties:
Vacuum packaging bag middle barrier films with good thickness uniformity can obtain better mechanical tensile properties. If the thickness is uneven, the medium barrier film is prone to rupture or deformation when subjected to external force, affecting the packaging effect and safety of the product.
Reduced printing overprint accuracy:
Films with uneven thickness are prone to overprinting problems during the printing process, affecting the aesthetics and market competitiveness of the product.
Uneven sealing quality:
For composite vacuum packaging bag films of the same inner material, if the thickness is higher, the starting heat sealing temperature will be higher, and vice versa. If the thickness is uneven, it will lead to uneven sealing quality and poor local heat sealing, affecting the sealing and shelf life of the product.
Thickness measurement and adjustment
Thickness measurement method:
We use a variety of methods to measure the thickness of vacuum packaging bag films, including metallographic microscopy, scanning electron microscopy, stylus method, etc. These methods can accurately measure the thickness of the middle barrier film with high repeatability and accuracy.
During the measurement process, we follow the principle of multi-point measurement and calculate the total average value as the measurement result of the film thickness to ensure the accuracy and reliability of the measurement results.
Thickness adjustment method:
According to the measurement results, if the thickness of the multilayer medium barrier film is found to be uneven, we will promptly adjust the production process parameters, such as the screw speed, extrusion temperature, die gap, etc. of the extruder to change the thickness distribution of the film.
We will also adjust the composite process, such as changing the amount of glue, composite pressure and other parameters to ensure the close bonding and thickness uniformity between the multilayer films.
During the winding process, we use an advanced tension control system to ensure that the tension of the film during the winding process remains constant to avoid the problem of uneven thickness.
Continuous monitoring and improvement:
We have established a strict quality monitoring system to monitor and record various data in the production process in real time. If uneven thickness is found, we will take immediate measures to correct it and continue to track the improvement results.
In addition, we also regularly maintain and service the production equipment to ensure the stability and accuracy of the equipment, providing a strong guarantee for the production of high-quality vacuum packaging multi-layer barrier films.