Heat sealers: what are they?

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Heat sealers are devices that use heat to seal plastic packaging and are used by various industries. There are two types: automatic and impulse. They can be used with different plastics and have temperature control. They can also be combined with vacuum packers for food preservation. Heat seal bags come in different sizes and shapes, and labels can be printed in-house.

Heat sealers are devices that seal plastic packaging with the application of heat. Many industries use heat sealers to prepare products for sale, ranging in size from small businesses to large corporations handling high volumes of material. Various styles and sizes are available from different companies that specialize in manufacturing heat sealers, along with plastic bags to go with them.

There are two basic types of heat sealers. Automatic or continuous heat sealers use moving belts to maintain a continuous production line. The products are bagged, shipped along the tape, sealed and placed in boxes for shipping or storage. Impulse heat sealers have a single element and are usually designed to be operated by hand. In some cases, an impulse heat sealer is partially automated. Continuous heat sealers are much larger and more expensive, due to their larger size and higher volume capacity. Impulse heat sealers vary in price, with simple desktop versions being very affordable.

Most heat sealers are designed to be used with a variety of plastics, although they may specify which plastics are safe for use. A temperature dial allows the user to control the temperature of the heating element, so the temperature can be turned down for more delicate plastics or raised for tough plastics. As the pack passes through the heat sealer, pressure is applied to encourage the two sides of the pouch to fold together and the time is also controlled, to ensure the plastic is exposed to the heating element for an appropriate amount of time.

A thermosealer can also be combined with a vacuum packer, as is often the case with thermosealers used in food packaging. The vacuum sealer extracts all the air from the bag, while the heat sealer makes an airtight seal, preventing oxidation of the food inside. Many anglers use vacuum packers/heat sealers to preserve their catch at sea, freezing most of the fish in the vacuum packs for future consumption.

Heat seal bags come in a range of sizes and shapes, allowing people to pack a wide range of things inside. The size of heat seal bags a company can use is limited by the length of the heating element on the heat sealer, as the entire sealing edge must be sealed at once for the most effective and smoothest seal. Many companies also produce labels designed to fit on their heat seal packaging, for businesses that want to print their own in house.

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