Products need packaging so that its safety can be ensured. Without proper packaging, it is difficult whether the product will reach its destination safely or not. The quality and freshness of the products can be judged through its sealing capability. The intactness of packaging bags is tested using several testing instruments. Laboratory Heat sealer is used to seal these packets and bags strongly so that it does nor damage the freshness of the product.
Heat sealing is used to join thermoplastic films. Types of heat sealing are:
- Hot-bar welding
- Impulse welding
- Hot bar sealers
- Continuous heat sealers
- Hot melt adhesive
- Hot wire sealing
- Induction welding
- Ultrasonic welding
The main application of the above mentioned heat sealing types are in various industries such as packaging industry to seal films, bags, and containers made form thermoplastics. It includes a plastic pot and tray sealing for food packaging applications. Various medical devices are heat sealed in packages of thermoplastic and plastic coated paper. The heated area is textured to minimise and control the joint strength. Outer packets for laminated packs for powders, colostomy bags and tablet blister packs are heat sealed.
Besides medical and packaging applications, various electronic devices are combined by heat sealing which includes printed circuit boards, electronic packages and liquid crystal displays. The process of creating electrical conductive adhesive bonds between rigid and flexible circuit boards, glass panel displays and flex foils using adhesive pre-printed on a connector foil is known as heat sealing. The important process is cooling and heating of the adhesive under pressure. Testing heat sealing parameters is performed by creating controlled sealing conditions by utilising a calibrated Laboratory Heat Sealer.
Heat sealing of products with thermal adhesives are used to hold clear display screens onto consumer electronic products and for other sealed thermos-plastic assemblies where heat stacking or ultrasonic welding are not optioned because of part design requirements or other assembly considerations. Some seals are measured by pulling to assess the existence of a bond and the mechanism of failure. Seal strength is the measurement of quality for use in process validation, process control and capability.
Presto’s Lab Heat Sealer is used to test the heat sealing quality of products by assuming the sealing environment in a lab under controlled parameters. It is highly adjustable and has accurate control. Equipped with a digital display screen based on chip based program.