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Rolls Film
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The shrink wrap process involves two stages - the enveloping of the pack in shrink wrap either totally or partially and - the application of heat to the shrink wrap film which activates the material's memory of its non-stretched molecular chains.

The application of shrink wrap can be divided into two principal types - transit and display.

Transit

The purpose of transit packaging is to offer the lowest cost option for packaging. The material used is almost exclusively polyethylene, which will provide the appropriate strength at the lowest available cost. A typical application is the collation of individual packs with or without tray support. The most frequent use of the forgoing involves the packaging of a quantity of cans or bottles or cartons for distribution.

The equipment used involves a sleeve or bundle sealer working in conjunction with a shrink tunnel. Two rolls of material produce a sleeve of film around the pack, which is then processed through the tunnel. Generally, these open sleeves do not cause any disadvantages to the pack integrity although a modification can be made to the tunnel whereby an attempt is made to have the hole closed through excess, annealed film.

A considerable amount of automation is offered for this process so that one may find a full range of manual, semi and fully automatic sealers and at maximum through-put, one can find lines with speeds of up to 200 packs per minute.

The processing of polyethylene is distinguished by the need for the shrink wrap film to reach an almost melt state, after which cooling will provide significant additional shrink. As a consequence, tunnels require specific cooling devices if elevated output speeds are needed.

All of this equipment may be used to wrap individual packs where collation is not required but a degree of protection is needed. Applications may vary from radiators through to office doors and bolts of cloth.

Display

The identical processes are also applied but with display shrink film where products have a natural requirement to use a sleeve. Gift wrap and wallpaper rolls fall into this category. The principles remain the same although both the sealer and tunnel will be modified to accommodate individual rolls with appropriately small diameters.

Turning to mainstream display applications, the main characteristic is the use of a total wrap.

In every single case, the sealer must now create a flat, two-dimensional bag around the product.

The product and this bag are then processed through a shrink tunnel to achieve the desired effect.

At the most basic level, this is achieved using an L-Sealer and folded film. The product is manually placed between the two layers of film and again manually placed into the sealer. The seal is completed and the pack placed on the tunnel conveyor. This is a continuous process that also produces an element of scrap film.

Automation is applied to the seal head and also to the pack support. Then, the seal process and the removal of the pack to the tunnel become automated. Generally, this is regarded as semi-automation. The clamping of the sealer head will be carried out using either a solenoid or a pneumatic ram.

Full automation of an L-sealer will allow packs to be automatically fed into the film and through to the sealer.

Manual vs. Automatic

Over the last few years, there has been a general polarisation of the above machines into manual and fully automatic, with relatively few machines being used in semi-automatic form. A manual machine will produce in the order of 10 packs per minute whilst a fully automatic will produce in the order of 20 packs per minute and there is relatively little speed advantage to be gained from a semi-automatic sealer.

Costs also have a significant influence here since entry level equipment can be purchased at significantly less than 2000 pounds whilst fully automatic shrink wrap machinery can be purchased at significantly less than 20,000 pounds.

The conventional use of a manual sealer and tunnel has been significantly reduced by the use of combined seal and shrink machines, commonly referred to as chamber equipment. These machines have a particularly small foot print and operate generally from single phase. The sealer head incorporates a plastic enclosure whilst heat is stored within the unit so that a combined seal and shrink can take place.

The maximum output that can be achieved from a fully automatic sealer will be in the order of 25-35 packs per minute.

As a consequence, both side seal and flow wrap machines are used to offer speeds approaching 100 packs per minute. The methodology remains the same as ever - to wrap the pack in a two dimensional bag of shrink wrap film.

Frequently, flat film is used although folded film is still applied by a number of machines. The sealer will be able to process individual packs at a much higher rate through the ability to seal at an appropriately higher rate.

Cross seals involve the seal device travelling with the pack whilst side seal or overlap seal mechanisms allow for film to be sealed continuously.

These same machines may be applied to other bagging requirements - in particular the mailing of magazines.

Machinery can be specifically customised to take advantage of any shrink wrap film's particular attributes to allow an appropriate pack to be achieved. One example of the foregoing is the modification of this process to allow for modified atmosphere packaging of food using barrier shrink film.

This article was written by shrink wrap expert Richard Jankel with the support of Kempner, UKÂ’s largest distributor of display shrink wrap machinery and materials. For special offers please visit Kempner online at http://www.kempner.co.uk/

How to Laminate Documents Using your School Roll Laminator

Almost every elementary school has a roll laminator sitting in their office, library or work room. However, many teachers and parent volunteers have no idea how to use the laminator. Laminating documents with this type of laminator is not really difficult. You just need to know how. This article is designed to provide a set of simple step by step instructions for laminating with your school laminator.

1. Turn on the laminator at the main power switch located at the back of the machine. If the machine does not turn on, be sure to check and make sure that the laminator is plugged into an outlet at the wall.

2. Make sure that the feed tray and the heat shield are in the proper position. If the feed tray is not installed correctly and the heat shield is not pulled down the laminator will not heat up and the rollers will not move.

3. Most laminators will default to the lowest heat setting when they are first turned on. You will most likely need to select the correct heat setting for the thickness of the film that you plan on using. You will also need to select the correct speed for the type of paper that you are planning on laminating. If you are laminating heavier stocks, you will need to run the laminator at a slower speed and if you are laminating lighter stocks you will need to choose a faster speed. Most laminators will have guidelines posted on the top of the machine that will tell you the appropriate speed and temperature settings. Follow these guidelines and adjust as needed.

4. Wait until the ready light on the laminator illuminates to let you know that the laminator is warmed up and ready to go. It can sometimes take as long as 10 minutes for the laminator to warm up so be patient.

5. Position the items to be laminated on the feed table.

6. Press RUN to start the rollers moving. Wait for the heat line to disappear and then push the items into the nip point of the heated rollers. You can continually feed items into the laminator without stopping the laminator. In order to maximize your laminating output you can run multiple items at the same time. However, you need to be very careful not to overlap items.

7. Stop the laminator once all of the laminated items completely exit the rear of the machine.

8. Your laminator most likely has a film cutter on the back of the machine. In order to use the cutter you can simply depress the cutters handle while sliding the cutter across the film. The little razor blade will cut the laminating film off the back of the machine.

9. If you plan on using the laminator again, you can leave the power on. Otherwise, you can turn the power off. If you leave the laminator on for an extended period of time, the laminator will go into standby mode and cool down.

If you follow these simple steps you will find that laminating is easier than ever. Try it for yourself and discover just how quickly you can laminate your documents, posters, projects, and graphic aids.

About the Author

Jeff McRitchie is the designer and Director of Marketing for MyBinding.com. He has written over 100 articles on laminators, laminating supplies,binding machines,binding supplies and more.

Can I exchange 10 rolls of unopened film in their original packaging for store credit?

It's past the 15 days return period, but I still have the receipt. I bought these 10 rolls of film at B&H Photo store

They are usually strict with their returns especially with items like films (film if not stored properly - like in hot temperature -loses it's grade). But there is 1% chance that you might speak with someone who is giving that day. Be nice (you can attract more flies with honey - also with BS) when you call their customer service - Customer Service at 800-221-5743 / 212-239-7765.

Otherwise, you have ten rolls for a project to do.

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