A heated gravure roll transfers the hot and thus liquifed adhesive onto the substrate to be coated in a structured form. Most often, the adhesive is applied in dots, nets or line - structures with many different parameters.
Melted adhesive is pumped through a heated slot die. At the lip of the slot die the adhesive is applied to the substrate`s surface. Depending on the amount of adhesive lay-down and speed, the adhesive is transferred in open or closed film structure.
A heated roll transfers the hot liquid adhesive onto the substrate. By a differential speed between substrate and application roller, it is possible to decrease or increase the application amount, thus decreasing or increasing the coating weight.
FLEXO COAT System:
Coating weight adjustment
The heated spray bar is fed by a gear-pump with the liquifed adhesive. The adhesive, leaving the nozzle, is dispersed by pressurized air. Without contact, the adhesive is transferred to the surface of the substrate passing by. Depending on speed and adhesive amount, an open or closed adhesive layer can be created.
A rotating, structured roller is filled with thermoplastic powder. Depending of the required coating weight, the rotation speed is adjusted. Right after, an oscillating brush empties the roller and this way, the volumetrically dosed powder falls onto the substrate passing underneath.
FLAT BED LAMINATION
In order to coat or laminate various substrates, the material is transported between two belts through a heating section. This way, the thermoplastic adhesive, applied before the machine in form of powder, webs or films is melted. Most often, the heating section is followed by a calandering unit and a cooling section. This way, the liquifed adhesve is squeezed into the surfaces where it solidifcates by cooling and thus glues the substrates together.
A heated gravure roll runs under a powder filled funnel. The funnel is equipped with doctor blades, so that the roller is stripped off from remaining powder, when it is leaving the funnel. The fabric to be coated is heated up to pick up the powder provided from the relatively cooler gravure roll, when it is getting in contact.
PASTE & DOUBLE DOT
A rotating screen runs over the substrate to be coated. Inside the screen is a squeegee blade. Through a pipe system, paste or other dispersions are fed into the screen. By the rotation of the screen, the blade pushes the paste through the holes of the screen and coats the substrate. In case of a double dot system, powder is fully coated onto the substrate right after the dot coating. Afterwards, the exceeding powder captured by the wet dots is sucked off.
In order to make foam sticky enough for bonding with other substrates, the surface of the foam needs to be burned by a fame system, generated by pressurized or natural gas. Depending on the thickness of the foam to be burned, the production speed and burner settings are to be chosen. Right after the buring section, the foam can be laminated with almost all substrates.
Our various melting - and metering systems are used to liquify the adhesives, which are available in various forms like drums, blocks, pillows, granules and bags. Most often, tank- or drum melters are used for this purpose. Heated pumps and hoses feed then the melted adhesive to the different application systems.
ACCUMULATION & WINDING
In general, for most materials we handle, winding and often accumulating equipment is used. We do therefore offer all common accumulation systems, like roller or belt accumulation, as well as J-Box systems. For the winding we supply simple unwinders with manual break, but also traditional surface or center winders, and where sensible even semi-automatic winding units.
CUTTING & STACKING