Material Structure and Thickness of sealing film roll

Definition of sealing film roll

Sealing film roll — a continuous roll of thin, flexible film material used to create an airtight, moisture-resistant, or tamper-evident closure or barrier when applied to a container, package, or product.

Main features of sealing film roll:

Ability to form a reliable bond with container material under specified conditions (temperature, pressure, dwell time).

Resistance to oxygen, moisture, light, or contaminants as required by the product.

Withstands processing conditions (e.g., pasteurization).

Force required to open a peelable seal—balanced to protect product but allow consumer access.

Thickness, stiffness, and winding must match sealing or packaging equipment.

What does the material structure of sealing film roll refer to?

The material structure of a sealing film roll describes the layered composition and arrangement of the materials that make up the film. It explains what each layer is made of, how the layers are stacked, and the role each layer plays in performance. and, like other flexible packaging products, are made by laminating different types of plastic films. The material structure is the elements used for pricing of sealing film roll.

What are the commonly used material and structural combinations for sealing film roll? What are their characteristics?

Simply put, the material structure of sealing film roll consists of three layers: “printing layer,” “barrier layer,” and “sealant layer.”

NY/EVA

This sealing film roll structure uses NY as both the printing layer and the barrier layer, providing very strong puncture resistance and compression resistance.

PET/PET/EVA

This sealing film roll structure uses PET for both the printing layer and the barrier layer. Its performance is generally good, but it is cost-effective.

PET/PET/CPP

This sealing film roll structure uses CPP as the sealing layer, which is not tearable. It is often used for packaging milk tea cups and requires a straw to pierce it for consumption.

PET/VMPET/EVA

This sealing film roll structure uses VMPET as the barrier layer. In addition to providing strong sunlight barrier properties, VMPET makes the printing effect incredibly bright and vivid.

PET/NY/RCPP

This sealing film roll structure can withstand high-temperature sterilization at 121 degrees Celsius. The NY barrier layer provides strong puncture resistance and compression resistance.

PET/AL/EVA(RCPP)

PET/AL/EVA: This sealing film roll structure can withstand pasteurization at 90 degrees Celsius. The AL barrier layer provides strong puncture resistance, compression resistance, and high barrier properties against moisture and oxygen. If the sealing layer is replaced with RCPP, it can withstand high-temperature sterilization at 121 degrees Celsius.

What does the thickness of the material structure in sealing film roll refer to?

It refers to the total thickness of the “printing layer”, “barrier layer” and “sealant layer”. The data can be obtained by measuring at any position of the sealing film roll with a caliper. For example, if the measured data is 105 microns, then the net thickness should be 100 microns, because the remaining 5 microns is the thickness of the composite glue and solvent between the layers after drying, which does not need to be included.

How is the thickness of sealing film roll material structures determined?

Generally, its material structure has a conventional thickness range of 60 to 140 micrometers. This is directly related to its matching packaging equipment. If the thickness is less than 60 micrometers, the sealing film roll is prone to having its printed layer and barrier layer damaged by the high heat-sealing temperature of the sealing machine (making it impossible to tear open) because it cannot withstand the temperature. If the thickness is greater than 140 micrometers, the sealing film roll is prone to not sealing firmly because the temperature of the sealing machine cannot be completely conducted to the sealant layer.

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