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There Are Two Major Plastic Heat Sealer Designs Available

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There are two major plastic heat sealer designs available, each capable of handling a variety of materials. There are dozens of thermoplastic materials available to processing plants, and each one is only compatible with a certain design. For this reason, processing facilities should try to use bags that are made of uniform material or different bags that are all compatible with a single machine. Complicating the issue further is that these devices range from completely manual to completely automatic.

An impulse plastic heat sealer utilizes a brief electrical current to activate a pair of grabbing jaws
. The jaws are so hot at this point that they will slightly melt the top of any bag they grab. This design can be hand operated, pedal operated or fully automated. They are perfect for materials that don’t require extremely high temperatures to close up. These include polypropylene, polyethylene, polyurethane, polyvinylchloride, Saran, Nylon, polyvinyl alcohol, bubble packs, foil, coated bags, padded mailers, Kel-F, Tyvek, Mylar, and Polyflex. Each bag only takes a second or two to close, so it is feasible to treat 50 bags a minute with an automated device. A manual impulse plastic heat sealer will only be able to close up about 20 bags a minute.

Unlike an impulse design, a continuous design comes with a contact surface that is always powered as long as the machine is in operation. Instead of grabbing jaws, the bags are conveyed through the machine and come in contact with the hot surface. By the time the bag has moved on from the machine, it will have a tight closure. This design is better for materials that require higher temperatures or more sustained contact with the contact surface to melt slightly. A continuous plastic heat sealer that is automated can treat thousands of bags every hour, and is ideal for high volume processing. The best materials for this machine are poly cello films, wax paper, Mylar, coated PP, cellophane, coated aluminum foil, gusset bags, and coated Kraft paper.

Regardless of the design, the idea behind the seal is to slightly melt the top, open end of the bag and fuse the lip together
. This provides an airtight and watertight barrier that is important for several industries. The food processing and animal feed industries need a plastic heat sealer in nearly every processing plant, but they aren’t the only industries that benefit from this technology. The medical industry is responsible for producing sterile instruments that will not endanger patient health. By closing them up in an air and watertight bag, microbes cannot latch on to the instrument. The parts fabrication industry also needs these machines because metal or electronic parts are highly sensitive to moisture, dust, and oxygen. If they aren’t protected from these hazards, they may short out or rust into ruin.

Fortunately, these devices are compact and inexpensive to operate, so they can be placed in most facilities without causing a space or money problem. Their versatility and importance can’t be understated, either. Without heat sealers, consumers would be exposed to dangerous bacteria and viruses, so these devices aren’t just a convenience, they are a crucial safety measure.




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