The shrink wrap process involves two phases - the enveloping of the pack in shrink wrap possibly entirely or partially and - the software of heat to the shrink wrap movie which activates the material’s memory of its non-stretched molecular chains.

The software of shrink wrap can be divided into two principal kinds - transit and screen.


The goal of transit packaging is to provide the lowest expense selection for packaging. The content utilized is nearly completely polyethylene, which will provide the appropriate energy at the lowest available price. A standard application is the collation of personal packs with or without having tray assist. The most repeated use of the forgoing involves the packaging of a amount of cans or bottles or cartons for distribution.

Shrink Tunnel Machine utilized entails a sleeve or bundle sealer working in conjunction with a shrink tunnel. Two rolls of substance produce a sleeve of film around the pack, which is then processed by way of the tunnel. Typically, these open up sleeves do not lead to any down sides to the pack integrity though a modification can be made to the tunnel whereby an attempt is made to have the gap shut by means of excessive, annealed film.

A significant volume of automation is provided for this procedure so that one could uncover a full range of guide, semi and entirely automatic sealers and at optimum by means of-put, 1 can find traces with speeds of up to two hundred packs per minute.

The processing of polyethylene is distinguished by the need for the shrink wrap movie to attain an practically melt state, right after which cooling will supply substantial extra shrink. As a consequence, tunnels need particular cooling devices if elevated output speeds are required.

All of this equipment may be used to wrap specific packs in which collation is not needed but a diploma of safety is required. Apps might vary from radiators via to business office doors and bolts of fabric.


The identical processes are also used but with exhibit shrink film exactly where merchandise have a all-natural requirement to use a sleeve. Present wrap and wallpaper rolls slide into this class. The concepts continue being the exact same although each the sealer and tunnel will be modified to accommodate person rolls with appropriately small diameters.

Turning to mainstream display programs, the major attribute is the use of a total wrap.

In every one situation, the sealer should now produce a flat, two-dimensional bag close to the merchandise.

The solution and this bag are then processed via a shrink tunnel to achieve the sought after result.

At the most basic stage, this is attained using an L-Sealer and folded movie. The merchandise is manually positioned in between the two levels of film and once more manually positioned into the sealer. The seal is completed and the pack put on the tunnel conveyor. This is a ongoing procedure that also produces an element of scrap film.