Manufacturers need to protect their processed goods before they get to the end market. Keeping the products free from contamination and any tampering happens through tamper proof sealing. Heat sealing is one of the ways that is used to keep products from getting contaminated. It involves applying one or more layers of packaging on the merchandise to protect against humidity and other contaminants that may corrupt the authentic product. Here you learn what is heat sealing for packaging and how it works.
Understanding more about heat sealing tool
What is heat sealing?
Heat sealing involves the process of fusing a layer of thermoplastic to another using continuously applied pressure. Heat is applied using a pressurized heated bar or dye. The process can also involve the joining of a thermoplastic part to another part that is not thermoplastic.
Applications utilizing heat sealing
Application of this sealing method is done in a diverse number of ways. Some of the ways include in electronic devices to connect lead display screens (LCDs) to their circuit boards, as well as in medical and communication devices. Heat sealing is used diversely in the medical field in making fluid bags, blood test and filtering apparatus, as well as test strips. Thermoplastic medical equipment like trays is also sealed with layers of film to prevent contamination.
Types of sealers
Heat sealers come in various forms depending on the application required.
Heat bar sealers
Hot bar sealers are frequently used machines that use one or more heated bars or dyes that use constant temperature and pressure to seal two layers of thermoplastics together. This machine shows the basics of what is heat sealing for packaging and how it works. The machine has a release layer or material like Teflon that prevents the heated thermoplastics from sticking to it.
Impulse heat sealers
They utilize an electric current to heat through a material called Nichrome. Nichrome is held between a rubber layer and fabric or film that prevents the thermoplastic from sticking to the heating element. Heat is only applied through the current when it is required. After this, the plastic is cooled before pressure is applied to create a permanent seal.
Some of these machines use a cooling agent like water to cool the material before it is pressurized. Moving belts, adhesive strips, heated wires and ultrasonic vibrations are other ways in which specialized materials use to seal thermoplastics together.
Sealers are made in various forms to suit the different application states. There are sealers made for hand use while others are made specifically for large hand use. There are those made with cutters that split the split the sealed material from the layers of unutilized thermoplastic. There are also automatic sealers that are preset with the right temperature and pressure.
The beauty of this machine is that it gives consistent results. There are also specialized foot operated sealers, as well as small hand, operated roller sealers used for smaller projects. Other specialties include food wrappers and shrink pack machines.