For the middle layer as a quality, raw materials can be used waste production waste (humps and slats, wood lifelong, pencils – plywood waste), without prior they cut off along the length. Special machines are used to obtain chips from long.
The chips are accumulated in the bunker, repeatedly chopped on a crusher and dried in a dryer with a rotating collector of pipes in the drying space. Dry shavings is sifted on a vibration dart, dosed with tape weights and loaded into a continuous mixer. Chips covered with resin accumulates in bunkers.
The disadvantage of this part of the scheme is the absence of dry chips bunkers. The ribbon scales actually only control the weight of the chips entering the mixer, but is not able to dose it, since all the chips that go out of the dryer must inevitably get to the vibration dime, the scales and go through the mixer.
The chips often do not have time to cool (especially in the summer) and enters the mixer warm, which can adversely affect the quality of the resin (cause it to harden until the mass enters the press).
Small chips are accumulated in bunkers with a capacity of up to 20 l3 each. In the case of downtime of the pressing stream, prolonged shutters covered with resin can also lead to a partial or complete hardening of the glue layer on the shavings surface, which cannot but affect the quality of the plates.
The chips are entered from the bunker in two forming devices of the medium layer 26, and from the hopper to the same devices for the formation of the front layers. Pallets coming from a transverse conveyor to a longitudinal transport transporter located on top are shifted to the conveyor of the formative device. This conveyor carries special transverse plates that overlap the gaps between the pallets. A three -layer chip carpet is formed in the form of a continuous tape.
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