CN2204446Y

CN2204446Y - Complex soundboard of piano

Info

Publication number: CN2204446Y
Application number: CN 94216601
Authority: CN
Inventors: 郭文汉; 史玉良; 韩冰力; 卜铁民
Original assignee: Piano Factory
Current assignee: Piano Factory
Priority date: 1994-07-08
Filing date: 1994-07-08
Publication date: 1995-08-02
Anticipated expiration: 2004-07-08

Abstract

The utility model discloses a composite soundboard which is applied to a piano. The utility model is formed that three layers of a surface board, a core board, and a back board are combined; positions between each two neighboring layers of the three layers of the surface board, the core board, and the back board are coated by binders, and hot press molding is carried out; the thickness of the soundboard is 8.2 mm; the core board is formed by the splicing of a plurality of homogeneous radial cutting thin boards; the surface board and the back board are formed by the splicing of a plurality of homogeneous radial cutting single boards; the directions of the sequential grain of the thin boards (or the single boards) are the same; at splicing time, an included angle between the direction of the sequential grain of each of the thin boards (or the single boards) and the length direction of the core board (or the surface board, or the back board) ranges from 0 to 180 DEG; the core board (or the surface board, or the back board) is formed by splicing. The soundboard with the structure enhances the utilization rate of wood, solving the problems of easy deformation, easy cracking, and difficult material selection existing in the original solid wood soundboards.

Description

Complex soundboard of piano

The utility model is the improvement of piano soundboard structure.

Piano soundboard adopts individual layer thin plate splicing of the same race to form at present.The soundboard materials of this structure require very strict, and defectives such as knot, bark pocket mustn't be arranged, and the annual rings of timber spacing that requires materials is at the 2-5 millimeter, and texture is perfectly straight, and color and luster will be near consistent, and splicing is tight.Because quality requirements is very strict, selection is just very difficult, and the utilization factor of timber is also just very low naturally.This solid wood soundboard by thin plate splicing is after moisture absorption or losing moisture content, and yielding or cracking has seriously influenced the piano quality.

The purpose of this utility model provides a kind of piano Complex soundboard of new construction.

The purpose of this utility model is achieved in that the piano Complex soundboard by 3 three layers of compound composition of dash board 1, central layer 2, backboard, scribbles bonding agent between every layer, and is hot-forming; Soundboard thickness is at 8-8.2MM.Central layer adopts polylith quarter sawing thin plate 4 of the same race to be spliced; When thin plate and thin plate splicing, it along the grain 5 presses same angle splicing.The angle that thin plate along the grain splices and the central layer length direction angle that is spliced are in 0-180 degree scope; Bonding agent is adopted in splicing.Dash board and backboard adopt polylith quarter sawing veneer splicing of the same race to form respectively; During splicing, veneer along the grain 5 by the splicing of same angle, with the dash board that is spliced and backboard length direction angle in 0-180 degree scope; Splicing adopts masking tape to heat bonding.The specification of soundboard is pressed the specification of piano and is decided.

The utility model has adopted dash board, central layer and backboard three-layer composite structure, and central layer can the employing timber different with dash board and backboard during production, and when especially central layer was selected materials, the color and luster of timber can not done requirement, and the annual ring of timber requires to expand 1-8MM to; And have the sheet material of defectives such as slight knot, scar after repairing, also can utilize, improved the utilization factor of timber so widely.This composite structure has solved that former solid wood soundboard is yielding, the difficult problem of cracking, difficult selection.The utility model against weather is good, and humidity is indeformable, does not ftracture, and has improved the piano quality, has widened timber materials kind.

The utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 the utility model structural representation

Fig. 2 central layer splicing synoptic diagram

1 dash board, 2 central layers, 3 backboards, 4 thin plates, 5 wood grains

The utility model scribbles urea-formaldehyde glue by 3 three layers of compound composition of dash board 1, central layer 2, backboard between every layer, hot-forming; Soundboard thickness is at 8.2MM.Central layer adopts polylith quarter sawing thin plate 4 of the same race to be spliced, and thin plate can be selected fish-scale floss, linden or Korean pine for use.The central layer specification can require according to the difference of piano to decide.When thin plate and thin plate splicing, it is along the grain by same angle splicing.The angle that thin plate along the grain splices and the central layer length direction angle that is spliced are in 0-180 degree scope; Bonding agent is adopted in splicing.Dash board and backboard adopt polylith quarter sawing veneer splicing of the same race to form respectively; During splicing, veneer along the grain 5 by the splicing of same angle, with the dash board that is spliced and backboard length direction angle in 0-180 degree scope; Splicing adopts masking tape to heat bonding.

Claims

1, a kind of piano Complex soundboard is characterized in that scribbling bonding agent between every layer by 3 three layers of compound composition of dash board 1, central layer 2, backboard, and is hot-forming; Soundboard thickness is at 8-8.2MM;

Central layer adopts polylith quarter sawing thin plate 4 of the same race to be spliced; When thin plate and thin plate splicing, it is along the grain 5 by the splicing of same angle, with the central layer length direction angle that is spliced in 0-180 degree scope; Bonding agent is adopted in splicing;

Dash board and backboard adopt polylith quarter sawing veneer splicing of the same race to form respectively; Veneer along the grain 5 by the splicing of same angle, with the dash board that is spliced and backboard length direction angle in 0-180 degree scope; Splicing adopts masking tape to heat bonding.