Heat sealing barswith a heat sealing band
The heat sealing bar is a system component; as such, it must allow your heat sealing application to take place and fit precisely into your machine environment. Our extensive experience and our application team are your guarantee that this is the case. We develop your sealing bar in collaboration with you and perform sealing trials in our test lab using your actual film. The heat sealing bar you acquire from us is designed in 3D and supplied together with all the technical information you need to install it in your machine.
Straight sealing bars
Straight sealing bars with a heat sealing band are widely used in film sealing processes. Owing to their good heat conduction, small mass and electromagnetic compatibility, they are generally manufactured from alloyed aluminum and have a rectangular section.
The body of the bar is mostly 30, 40 or 60 mm high and 10, 15 or 20 mm wide. The length ranges from a few centimeters to several meters.
The bars can be provided with coolant holes in the longitudinal axis on request. They are usually shipped by ROPEX fully assembled with bar end blocks, an underlay for the heat sealing band and Teflon tape.
Contoured sealing bars
Flat, contoured sealing tools are usually bespoke products for one specific customer, where the heat sealing bar and counter bar are designed together to ensure that they interact optimally.
Angular, circular, rectangular or curved contours can also be supplied depending on the task at hand. Precise laser cuts guarantee extremely close tolerances and consistent repeatability for complex band contours. The thickness, width and coating of the heat sealing band are adapted to the application.
The principal challenge here is to achieve a perfect balance between the temperature distribution, current input, expansion and alloy.
We can supply a very wide range of customized versions. The list grows regularly longer as you, our customers, challenge us to come up with novel solutions or contact us with innovative applications.
There’s a lot we can do to help you – yet we too are bound by the laws of physics. Impulse heating and cooling stresses the material and may cause damage to it if our design rules and recommended material combinations are ignored. Fatigue fractures, brittleness, burn marks, delamination etc. can occur, resulting in severe wear and premature failure.
The ideal “magic triangle” – heat, time and pressure – must be found.
We would be happy to test the feasibility of your special application and suggest an alternative solution where necessary. A perfect balance between your application and the sealing bar is key.
Sealing bars for 3D contours
Heat sealing bands also allow you to design three-dimensional contours owing to their elasticity. We are thus in a position to manufacture complete sealing bars for 3D contours. Spouts are a typical example here.
A flat film is fused onto both sides of a rigid, convex spout; it forms the top of a pouch or bag with a screw-type or tube connection of the kind often encountered in medical applications.
The challenges are similar to those presented by 2D contours, except that a thin film is additionally bonded to a hard, three-dimensional plastic. The sealing bar contour, heat sealing band and counter bar must be perfectly executed.