Material Structure and Thickness of roll stock packaging

What is roll stock packaging?

Roll stock packaging (often just called rollstock) is a form of flexible packaging where packaging film or laminate is supplied and processed in continuous rolls. The material is typically fed into a FFS(forming/filling/sealing) machine that converts the flat roll into individual packages — for example pouches, bags,trays — by forming the film around a product, filling it, and sealing/cutting it.

Common types of roll stock packaging processes：

Film forms a vertical tube, filled from top, bottom sealed. Common for snacks, grains, powders.

Film is folded and sealed horizontally; used for multi-packs or products requiring precise orientation.

Film is formed into cavities (usually the bottom web), product placed, top web applied and sealed — used for trays, blister-like packages.

What does the material structure of roll stock packaging refer to?

roll stock packaging is a type of flexible packaging product. Like other flexible packaging products, it is made by combining and laminating different types of plastic films. It is a factor in the pricing of roll stock packaging.

What common material structure combinations are used for roll stock packaging? What are their advantages and disadvantages?

Simply put, the material structure of roll stock packaging can be divided into three layers: the “printing layer,” the “barrier layer,” and the “contact layer.” There are many different material structures for roll stock packaging, so I won’t go into detail here, but generally speaking, the maximum number of layers is no more than three.

What does the thickness of the material structure in roll stock packaging refer to?

It refers to the total thickness of the “printing layer”, “barrier layer” and “contact layer”. The data can be obtained by measuring at any position of the roll stock packaging 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 50 to 140 micrometers. This is directly related to its matching packaging equipment. If the thickness is less than 50 micrometers, the roll stock packaging is prone to having its printed layer and barrier layer damaged by the high heat-sealing temperature of the FFS machine (VFFS or HFFS) because it cannot withstand the temperature. If the thickness is greater than 140 micrometers, the roll stock packaging is prone to not sealing firmly because the temperature of the (VFFS or HFFS) cannot be completely conducted to the contact layer.

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