Packaging - Heat Sealing
Separating films of PTFE and PTFE/fibreglass fabrics for use in machines for polymer packaging L-sealers, form/fill sealing, wrapping, blister packing, bag welding, etc.
The packaging foils are welded by applying heat and pressure, whereby they are also separated. During this process, the polymer foil becomes hot and sticky. Separating films (often one-sided adhesive products, tapes with leaders, or with adhesive strips at the sides) are attached to the welding beam for protection.
L-sealers are generally used together with an Shrinktunnel. After sealing in a tubular foil, the packaged goods are passed through a hot-air tunnel. The conveyor belt can be made of open-meshed PTFE/fibreglass fabric.
At its entry and exit, the Shrink-tunnel is fitted with curtains of silicone-coated fibreglass, intended to prevent damage to the still-soft shrink wrapping when leaving the tunnel. For the same reason, pressure rollers at the tunnel exit also have a PTFE/fibreglass covering.
PTFE Bag Sealing Fabrics - PTFE Bag Sealing Belts
PTFE bag sealing Belts is made of ptfe coated fabrics, ideal for heat transfer through the belt surface, so it is the main seal material for plastic bags.
Feature
Characteristics and advantages
Consisting of two layers of PTFE coated glass cloth laminated together, benefiting from the absence of any traces of traces in the joint area.
The high-grade PTFE used in the manufacture of the belt has a non-stick, high temperature resistant surface to prevent any molten plastic from accumulating on the belt surface.
Application
A large number of plastic bag manufacturing systems typically use these types of belts in general for a pair, resulting in a clamping effect on the bag. These belts can also be found on air-filled or air-cushion packaging machines as a means of allowing continued heat sealing without adhering the adhesive to the belt.
Sealed belts are often two conveyor belts that operate in series on a conveyor belt with a hot plate that, when they are running, are in contact with the interior of the belt. Heat transfer through the belt surface to seal the plastic bag when it passes through the machine.
