Sound insulating board

15:

• A sound-insulating board, comprising:
• a mixture of unglued wood fibers, a binder of thermoplastic adhesive fibers and/or supporting fibers, and a mixed plastic arising during a recovery of plastic parts from a dual system formed in a structure having a first large-area side, a second large-area side, and a continuous transition in a density thereof from said first large-area side to said second large-area side.

16:

• The sound-insulating board according to claim 15, which comprises a mixture of 50 to 60% of unglued wood fibers, an optional component of hydrophobicizing agent and/or flame prevention agent, 42 to 30% of mixed plastics from the dual system, and 8 to 10% of binders formed of thermoplastic synthetic resins.

17:

• The sound-insulating board according to claim 15, wherein the mixture partially contains binders and supporting fibers or supporting fibers and substantially no binder.

18:

• The sound-insulating board according to claim 15, wherein said supporting fibers are selected from the group of plant fibers consisting of hemp, straw, flax, and sisal, or synthetic resin fibers.

19:

• The sound-insulating board according to claim 18, wherein said supporting fibers are polyamide fibers.

20:

• The sound-insulating board according to claim 15, wherein said supporting fibers have lengths of 1 to 20 cm.

21:

• The sound-insulating board according to claim 20, wherein said supporting fibers have lengths of 13 to 15 cm.

22:

• The sound-insulating board according to claim 15, wherein said unglued wood fibers have a particle size from 0.3 to 1.2 cm and said mixed plastic has a particle size of 2.0 to 0.1 mm.

23:

• The sound-insulating board according to claim 22, wherein said unglued wood fibers have a particle size from 0.7 to 1.0 cm.

24:

• The sound-insulating board according to claim 22, wherein said unglued wood fibers have a particle size from 0.85 to 0.95 cm.

25:

• The sound-insulating board according to claim 22, wherein said mixed plastic has a particle size of substantially 0.2 mm.

26:

• The sound-insulating board according to claim 15, constructed with a thickness of 3 to 20 mm and a bulk density of 130 to 260 kg/m3.

27:

• The sound-insulating board according to claim 15, constructed with a thickness of 3 to 6 mm and a bulk density of 200 to 260 kg/m3.

28:

• The sound-insulating board according to claim 15, constructed with a thickness of 7 to 20 mm and a bulk density of 130 to 220 kg/m3.

29:

• The sound-insulating board according to claim 15, which further comprises a fiber nonwoven disposed on one or both of said first and second large-area sides of the board.

30:

• The sound-insulating board according to claim 15, which further comprises structuring formed on one or both of said first and second large-area sides of the board.

31:

• The sound-insulating board according to claim 15, which further comprises a fiber nonwoven disposed on one large-area side and structuring on the other large-area side of the board.

32:

• The sound-insulating board according to claim 15, formed by blowing a mixture of the initial products comprising unglued wood fibers, mixed plastics from the dual system and binders and/or supporting fibers in a desired composition out of one or more storage containers onto a continuously moved transport belt, and allowing same to harden in an oven with temperatures in a flow transition range of the thermoplastic adhesive fibers used as binders or parts of the mixed plastics, and cutting off boards to a desired length.

33:

• The sound-insulating board according to claim 15, formed by blowing a mixture of the initial products comprising unglued wood fibers, optionally provided with a hydrophobicizing agent and/or a flame prevention agent, mixed plastics from the dual system, adhesive fibers and/or supporting fibers in a desired composition out of one or more storage containers onto a continuously moved transport belt, possibly structuring and/or applying a fiber nonwoven to one or both large-area sides of the mass stream, allowing same to harden in an oven with temperatures in the flow transition range of the thermoplastic adhesive fibers used as binders or parts of the mixed plastics, and cutting off boards to a desired length.

34:

• The sound-insulating board according to claim 15, which comprises finishing the board as a sound-insulating board for laminate floors.

36:

• The method according to claim 35, which further comprises adding a hydrophobicizing agent and/or a flame prevention agent to the initial products.

37:

• The method according to claim 35, which further comprises structuring and/or applying a fiber nonwoven to one or both large-area sides of the mass stream prior to cutting to the desired length.