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Presentation on

BLOCK BOARD

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BLOCK BOARD

Blockboard is composed of a core of softwood strips (up to about 25mm wide) placed edge to edgeand sandwiched between veneers of hardwood, the 'sandwich'

is then bonded under high pressure.

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T hese blockboard that are generally known as " yellow boards "are composed of at least one base layer made of adjacent woodstrips that are glued together one near the other that is alongwalls perpendicular or transversal to the plane along which atleast a face of said board extends, at least one of the faces of the base layer and/or preferably both faces of the base layer

being covered by a finish and/or protective resin layer composed of a glue, particularly melaminic or phenolic resin,or the like.

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E co-Core Block Board:Blockboard is one of the oldest composites ever conceived.

Furniture built with this material was in fact found in theE gyptian Pyramids.T oday, blockboard panels reveal uncommon features of working versatility as they are easy to cut and reclaim, arelight in weight, stable and have high mechanical features.Besides its traditional use in joinery works, the great

dimensions of the boards make it advantageous for factoriesmanufacturing modern and quality furnishings, in particular doors and furniture, as the light weight exerts less stress onto

hinges, improving furniture life.

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S ource for Block Board:Blockboard is made up of a core of softwood strips. T hese

strips may be up to about 25mm wide.T he strips are placed edge to edge and sandwiched betweenveneers of hardwood.T he sandwich is then glued under high pressure. Blockboard isnot suitable for outdoor use because the glues used are interior

glues.

S izes:Blockboard is sold in sheets of 2440 x 1220mm and are

normally 30mm thick.

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Block Board

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I nstruments Used for Making Block Board

T he equipment detail list of blockboard productline cross cut saw, double surface fore plane, more round saw,

piece together machine, glue machine, pre-press, hot press,cutting sides saw, sanding machine , veneer dryer, veneer

cutting machine, drying house.

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Cross seam machine, cross seam machine, little diameter woodwhich sawed and cut from horizontal and vertical and

processed by series of procedures including polish by dual- plate woodworking planer, saw into specific plate bar bymulti-blade round saw, connect it into real wood floor by jointmachine, dual-sticky single plate, pre-pressing, hot pressingand sawing from horizontal and vertical.

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Machine for Cutting of the Blocks According to theRequirement

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Block Board I ndustries

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Manufacture of Block Board:Blockboard is made up of a core of softwood strips. T hese

strips may be up to about 25mm wide.T he strips are placed edge to edge and sandwiched betweenveneers of hardwood. T hese battens are then arrangedsystematically without any/extra gap between them. T he faceveneers and the core veneers are perfectly matched.

Bonding Agent:T hese are bonded with phenol formaldehyde and ureamelamine formaldehyde resin under controlled pressure andtemperature to get perfect bonding.T he sandwich is then glued under high pressure.T he chemical treatment given to the Block Board ensures itsdurability and resistance.

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Arranging of Blocks

Screws & Nails appliedafter Arranging

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T here are several types of resins that are commonly used.

Urea formaldehyde resin is the cheapest and easiest to use.It isused for most non-water resistant boards.

Melamine formaldehyde resin is significantly more expensive,as it is moisture resistant.Phenol formaldehyde is also fairly expensive. I t is dark colored and highly durable.In order to make the final product waterproof, fireproof, insect

proof, or to give it some other quality.

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Fixing:S crews and nails may be used to attach blockboard and

laminboard but you have to ensure that you make contact withthe strips of softwood and not the gaps between the softwoodstrips.T he edges of both blockboard are fixed with the limping and

are unattractive and cannot be cleaned up well.Place softwood strips,

veneers or fill and paint the edges.

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Finishing:

Blockboard may be bought with a variety of applied finishessuch as wood veneers and plastic laminate surfaces.I f both sides are treated in the same way blockboard and

laminboard have a good resistance to warping.T he edges of blockboard do not clean up well and are not veryattractive, so cover exposed edges with a decorative strip of softwood or fill and paint them.T he surfaces of standard boards can be painted, while pre-finished boards are available with a variety of applied surfaces

such as decorative wood veneers and plastic laminate facings.

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Blockboard has a good resistance to warping if both sides areleft natural or painted/papered. I f only one side is finished,

then surface tensions build up which will cause the sheet into a bend.

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Fingering Machine

Fingered Wooden Blocks

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BLOCK BOARD PRESSING MACHINE

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Applying Copper, Chromium,Boron

Manufacturing Process of Block

Board

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Fire & Bending Properties:T he fire and bending properties of blockboard with variousfire retardant treated veneers.Blockboard were manufactured using untreated fir strips andsandwiched between treated ekaba veneers at final assembly.T he veneers were treated with either boric acid (BA),disodium octoborate tetrahydrate (DO T ), alumina trihydrate

(ATH ), or a BA/DO T mixture.Modulus of rupture and modulus of elasticity tests were

performed according to S tandard.Blockboard were also tested for fire resistance as indicated by

a cone calorimeter.T reatments had little negative effect on flexural strength;flexural stiffness was significantly lower for the highesttreatment levels. T reatments resulted in a significant reductionin predicted flame spread rate.

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Moisture Resistant Block BoardIn the use of advanced technology and special composing toensure totally plain and uniform boards.I t ensure no gaps, overlapping or corrugation to eliminate thechance of opening up of the board when cut.T hese are also totally resistant to termite, borer and other wooddestroying organisms.

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MDF Block Board:Used for Furniture,

Decoration, Packing

Veneered Block BoardFace and back: Melamined or veneeredface and back, such as sapele, cherry,beech, oak, white, grey, ect.Packing: Pallet packing or loosepackingUsage: Furniture, Decoration, Packing

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Drawbacks of Block Board:In the Block boards it has been noted that due to thermalstresses, mechanical stresses and humidity, namely due to theexposure to thermal variations and/or to humidity and/or variations of sun radiation conditions or the like that is light-dark variations, in the long run leaks or cracks in finish and/or

protective melaminic resin layers occur in spite of the fact that board faces are covered by melaminic resin layers.T hese cracks are on the surface of board faces and allowhumidity to penetrate to layers made of wood strips that

become impregnated with humidity.T hat causes the beginning of rottenness or decay processes of wood material quickly making the board useless.

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T o overcome the drawbacks in the Block Board themethods used areT o improve a board of the type disclosed herein before suchthat the board have improved resistance to thermal, mechanicaland environmental stresses by means of simple and notexpensive expedients avoiding cracks or leaks in the protective

layer.T earing areas correspond to areas where wood material of strips have in turn leaks, cracks, grain or the like that are bynature present in wood material of strips and they occur notonly between areas where individual strips contact but alsoinside the individual strip.

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T he structure of the board according to the inventionand solving the problem comprises:At least a base layer composed of at least a layer of adjacentstrips glued together one near the other;At least a finish layer composed of a non woven fabricimpregnated with melaminic resin.

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ApplicationFurniture,

Kitchen Cabinets,Partitions,E xteriors uses,

Bank Counters,

S hip Counters,S hip Cabinets,WardrobesConstruction,

Packing.

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Reference:Forest Utilization By T ribhavn Methahttp://www.wisegeek.com/how-is-Block_board-made.htmhttp://en.wikipedia.org/wiki/Block_boardwww.design-technology.org/ Bl ockboard .htmwww.forbwoods.com/.../mr_and_bwr_grade_ b l ock _ board .html

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