Method for producing a fire-retardant veneer, and corresponding fire-retardant veneer
For producing a fire-resistant veneer or material composite having different core materials without adding salts or other commercial fire-retardant materials, liquid is drawn out from the pores of the veneer by heat treatment and is replaced by resin, and the veneer is, if required, subjected to a refining process.
1. A method of producing a fire-retardant flat structural member configured as a composite body comprising the steps of:
providing at least two veneer sheets and an intermediate layer of a core material located therebetween to provide the composite body;
disposing a resin film between the intermediate layer of the core material and the respective veneer sheet on each side of the intermediate layer, the veneer sheets having pores; and
supplying heat to the veneer sheets such that (i) water bound in the pores of the veneer sheets evaporates and is exhausted from the pores thereof and (ii) the resin films are liquefied by the heat, the exhausting evaporated water drawing the liquefied resin films into the pores of the veneer sheets by capillary action,
the step of heating being effected under an applied pressure such that the evaporated water exhausted from the pores flows out through edges of the member.
2. The method according to claim 1 , wherein each of the veneer sheets includes a separating material provided on one side thereof, and wherein the heating step is effected in a device that supplies the heat.
3. The method according to claim 1 , wherein a fabric is arranged between the intermediate layer of the core material and each of the respective veneer sheets.
4. The method according to claim 2 , wherein the separating material is at least one of a release paper and a release foil.
5. The method according to claim 2 , wherein the device is at least one of a heating press and an autoclave.
6. The method according to claim 3 , wherein the fabric is a fiber fabric.
7. The method according to claim 3 , wherein the fabric is resin-impregnated.
8. The method according to claim 1 , wherein the applied pressure is from 0.5 to 7 bar.
9. The method according to claim 1 , wherein the fire-retardant flat structural member is produced over a period of time of from 10 to 120 minutes.