The Matransfer is a line to produce a laminated finish on leather, fabrics, leatherboard and similar substrates. The film formation product applied on this equipment is a two component polyurethane.
The equipment can operate with:
- Silicon matrices
- Silicon (release) paper
- Combined matrices + paper
The laminating line is subdivided into various zones, each of which has a specific and precise function.:
- Entry Zone: this is essentially of two types: one with a matrix carrier and the other where the film is applied to silicon paper fed from coil.
- Preparation Zone: the first phase of the matrix system consists in spraying a pre-finish product onto it; with the silicon paper version this application is possible by spraying or by precision coating by doctor blade. After this application the product is dried with both matrix and silicon paper systems.
- First polyurethane cabin: after the matrix or the silicon paper has left the drying stage it enters the spray cabin where there is a special alternating mode mixing gun which mixes the two components, namely the polyurethane and the colour catalyst. These are then sprayed to form the first layer (the film) which acquires the design (the grain) imprinted on the matrix or the paper. The next phase is drying prior to entry into the second spray cabin.
- Second polyurethane cabin: in this cabin the same processes as in the preceding one take place. The drying phase however is omitted to allow adhesion of the product to the substrate.
- The Matching Zone: as soon as the matrix or the silicon paper leaves the second cabin it will be possible to lay the substrate to be bonded onto the freshly applied polyurethane. Substrates may be: leather, fabric, leatherboard (Salpa) or the like.
- Pressure Zone: after the substrate has been placed onto the polyurethane the combined layer passes under the rubber lined pressure rollers. These are connected to a variable force pneumatic pressure system to optimally press the substrate onto the polyurethane to avoid the formation of air pockets between the layers and to ensure maximum adhesion between substrate and polyurethane.
- Drying Stage: after the laminated substrate has left the pressure zone it enters the drying stage, an important phase in obtaining a quality product. Very precise process sequences occur at this stage: ventilation, heating, recycling of fresh air and evacuation of saturated air.
- Separation Zone: after the laminated substrate has left the drying stage separation takes place - from the matrix or from the silicon paper - safe at this point, insofar as the well dried polyurethane will already have accepted the design (grain) as well as being bonded to the substrate.
- Polyurethane dosing units: product dosing units are necessary (one per gun) to feed the spray cabin guns specifically as needed. These consist essentially of:
- One heated or cooled polyurethane reservoir.
- One heated or cooled coloured catalyst reservoir.
- One solvent reservoir for gun washing only.
- One polyurethane precision dosing pump .
- One catalyst precision dosing pump .
- One flameproof control panel to control the two dosing pumps each with its own test sampling flow unit. NOTE: upon request it is possible to fit two separate weighing systems in line to ensure even more precise proportions of polyurethane and catalyst mixtures.
- One set of heated or cooled piping to convey the products from the pump to the spray gun.
- Two independent variable speed drives (one per dosing pump) to regulate the correct quantities of polyurethane and catalyst to be mixed.