Unit_10_-_Flexible_Packaging - some parts of the seal to be...

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10.2.1 Heavy Duty Plastic Bags One of the early uses of bags of this type was in 1959 in Kansas where printed polyethylene bags were used to ship 50 pound units of chemical fertilizer. The plastic used to form the bags was 10 mils thick (How thick is that in inches?) and the tops of the bags were heat sealed. Today, this method of packaging is used for plastic resin pellets, potting soil, mulch, pet food, animal feed additives, stones, concrete mixes, and many other products. The major disadvantage of the thick plastic material is the difficulty of heat sealing through 20 mils of plastic. The process is usually slow and hard to control. This often causes
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Unformatted text preview: some parts of the seal to be over heated and melted away, leaving a hole, while other portions do not adhere together because the temperature does not reach the level necessary to be sealed together. Can you think of some examples where you have seen this? 10.2 Types of Flexible Packages The following are some common types and examples of flexible packaging. Examples of flexible packages. (While we are at it, notice the organic beef jerky and dog food as a consumer food trend.) 10. 2...
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