Aluminum belongs to one of the nonferrous metals in the metal category. Because of its wide application, the following are introduced respectively: aluminum profile and die-casting aluminum alloy. Among them, aluminum ingots with purity above 92% are used as the main raw materials, and metal elements such as carbon, magnesium, silicon and sulfur are added to form a multi-element "alloy".

1. 1 aluminum profile

Aluminum profiles are very common, such as screen windows and aluminum windows. It adopts extrusion molding process, that is, after the aluminum ingot and other raw materials are melted in the furnace, they are extruded into the mold by an extruder for outflow molding, and various profiles with different sections can also be extruded. The main properties, namely strength, hardness and wear resistance, meet the national standard GB6063. Advantages: light weight of only 2.8, no rust, rapid design change, less die investment, and longitudinal elongation exceeding10m. The appearance of aluminum profiles can be divided into two types: bright and matte. The treatment process adopts anodic oxidation, and the surface treatment oxide film reaches the thickness of 0.12m/m. The wall thickness of aluminum profiles is selected according to the optimization of product design, not the thicker the better in the market, but according to the cross-sectional structure requirements, which can range from 0.5 to 5mm, but laymen think that the thicker the tougher it is, it is actually a mistake.

The surface quality of aluminum profiles also has some insurmountable defects: warping, deformation, black line, convex and concave and white line. If the designer's level is high and the mold design and production process are reasonable, the above defects can not be obviously avoided. The inspection of defects should be carried out according to the inspection method stipulated by the state, that is, the sight distance is 40~50CM to identify defects.

Aluminum profiles are widely used in furniture: screen skeleton, various hanging beams, table legs, decorative strips, handles, trunking and cover plates, chair tubes, etc. , can be ever-changing design and use!

Although aluminum profiles have many advantages, they also have some disadvantages:

Aluminum without oxidation treatment is easy to "rust", which leads to the decline of performance and the longitudinal strength is not as good as that of iron products. The wear resistance of surface oxide layer is not as good as electroplating layer, and its cost is higher, which is about 3~4 times that of iron products.

1.2 die-casting aluminum alloy

Compared with the processing method of profile, the equipment used for die casting alloy is different. Its raw materials are aluminum ingots (purity about 92%) and alloy materials, which are melted in a melting furnace and molded in a die casting machine. Die-casting aluminum products can be designed like toys with different shapes, which is convenient for connection in all directions. In addition, it has high hardness and strength, and can be mixed with zinc to form zinc-aluminum alloy.

Die-casting aluminum molding process is divided into:

1, die casting

2. Rough polishing to remove the residual material of the mold.

Step 3: Fine polishing

On the other hand, in the production process of die-casting aluminum, there must be a mold to make it, and its mold cost is very expensive, which is higher than other molds such as injection mold. At the same time, it is very difficult to maintain the mold, and it is difficult to reduce the material and repair the design error.

Disadvantages of die-casting aluminum:

The production and processing capacity is more each time, and the cost is low. The cost of products with complex polishing and slow production cycle is about 3~4 times higher than that of injection molded parts. The screw hole should be larger (4.5 mm in diameter) to stabilize the connection force.

Scope of application: table feet, bench connectors, decorative heads, aluminum seals, desktop and coffee table jacking, etc. , the scope is very wide.

(2) Hardware

The concept of "hardware" is a popular saying. The standard classification should be divided into ferrous metals and nonferrous metals. Used for tubular, rod-shaped, plate-shaped, linear and angular furniture.

2. 1 ferrous metal parts

Mainly refers to iron products, which have the advantages of no deformation, extremely high strength, good wear resistance, high hardness, low price and long service life. It belongs to carbon-iron alloy and is divided into high carbon steel, low carbon steel and medium carbon steel. Divided into round tube, square tube, angle steel and steel plate. The round tube is mainly used for chair products; Square pipes are used for beams and supports; Steel plates are mainly used for baffles, mesh plates, pendants, handrails, metal cabinets, doors, etc.

Disadvantages of steel products:

1, easy to rust

2, the volume is heavy

3, afraid of humidity

The methods to solve the above defects include electroplating, spraying, blackening and bluing treatment, etc.

There are many ways to process and shape hardware: bending, punching, drilling, welding, cutting and stamping. In short, it is processed according to the design requirements or product requirements.

2.2 Nonferrous metal parts

Refers to all metal parts except iron products, such as aluminum, copper, zinc and stainless steel. It has a characteristic that it is not easy to rust, and its strength is worse than that of ferrous metal. Widely used in furniture: aluminum plate, aluminum strip, stainless steel tube, stainless steel plate, copper plate and zinc plate.

Stainless steel parts: Stainless steel parts can be divided into stainless iron and stainless steel: "430" is often called stainless iron and "304" is pure stainless steel. One way to distinguish them is to test with a magnet that "430" can be attracted by magnets, but "304" can't. The proportion of stainless steel is slightly higher than that of iron products, but the price is four times higher than that of iron products, so only high-grade products can be used.

Copper products: Copper products are divided into pure copper and copper alloys. Pure copper, also known as red copper, has poor strength and hardness, but good toughness. Brass is widely used in furniture in copper alloys, and it is an alloy copper mainly containing zinc. The price of pure copper is slightly 30~40% higher than that of "304" stainless copper, and the price of brass is 20% lower than that of pure copper. The hardness and strength of copper alloy are slightly higher than that of stainless copper, but it is easily broken and brittle. The copper parts used in furniture are mainly handles and embedded screws. In order to prevent "rust", pure copper can only be used after electroplating, but brass is not needed, and there are few products widely used in furniture.

Zinc products: Pure zinc products are rarely used, mainly combined with zinc alloy or steel. Such as galvanized sheet, electrolytic sheet, etc. It is less used in furniture because the strength of zinc products is poor. Zinc alloy fittings, such as eccentric buckle, connection point of structural parts, etc. The specific gravity of zinc alloy is slightly lower than that of iron by about 6.8, and its price is between steel and aluminum alloy. Most zinc alloys produce furniture accessories in the form of die casting.

Titanium zirconium alloy: this expensive metal is used in furniture, mostly in the form of electroplating, and is used in high-grade handles, hinges and high-gear exposed connectors or hotel furniture. Its electroplating cost is about 40% higher than that of chromium plating, but its appearance is high-grade similar to that of gold and silver products, with good wear resistance and no rust.

2.3 Cast metal

There are many castings used in furniture hardware products, such as handles and door hinges. At present, there are many production methods of various castings popular in the market, such as precision casting, die casting and casting. The casting materials are brass, stainless steel, zinc-tin alloy and aluminum alloy. Features of casting products: exquisite, special shape, etc. The disadvantage is that the single piece cost is high, and the process cost of different castings is different. From high to low, the cost of precision casting and die casting is from high to low: die casting and precision casting. The disadvantages of casting products are: the production cycle is slightly longer, the products have to go through 2~3 processes to make qualified parts, and the parts have to be decorated by electroplating, polishing, wire drawing, sandblasting and oil spraying according to different requirements.

(3) Rubber and plastics

3. 1 plastic parts

Plastic products are widely used in furniture. There are many kinds of materials: ABS, PP, PVC, PU, POM, PA, PMMA, PE, PS and PC. Different materials have different application ranges.

ABS: commonly known as engineering plastics, it can be used for connectors, chair backs and seat boards. It is the main raw material for plastic electroplating (water electroplating).

PP: common name polypropylene, used for five-star feet, handrails, foot pads and connectors with low strength requirements. Disadvantages: poor wear resistance and low surface hardness.

PVC: commonly known as polyvinyl chloride, mainly used for edge sealing and insertion conditions. It is suitable for extrusion molding. At the same time, PVC material belongs to non-combustible materials in plastic parts, and its processing and molding temperature stability is poor, especially its color stability is not good.

PU: commonly known as polyurethane. Mainly used for handrail (foam) fittings.

POM: The common name is Sai Gang. Mainly used for wear-resistant parts such as foot pads, casters, door hinges, hinges and so on. Wear resistance and pressure resistance, but poor dimensional stability.

PA: commonly known as nylon. Mainly used as foot pads, five-star claws, casters and other places with wear resistance and high life requirements. Features: Wear resistance, pressure resistance, high strength and long indoor service life. Some models, such as PA66, are resistant to high temperature of 2200, but the disadvantages are variability, easy breakage and poor sun and weather resistance.

PMMA:: plexiglass (commonly known as sub-afterburner). There are five transparent materials in plastics, and PMMA is the most transparent one. The workpiece smells of acetic acid when it is cut, and it is easy to deform when it is processed. Soaking in boiling water can shape and bend. Disadvantages: the surface is easy to scratch, the hardness is low, the bending is easy to crack, and the price is more than 20% higher than ABS.

PC: commonly known as polycarbonate. This variety is also a transparent material with high surface hardness, scratch resistance, strong impact resistance, high strength and good weather resistance (that is, not afraid of sunlight). Screen partitions and sun panels in furniture are made of this material by hollow extrusion. Features: high cost, about 40% higher than PMMA.

3.2 Rubber parts

Vulcanization process is mostly used for rubber variety molding, which is characterized by good flexibility, adjustable hardness, complex shape and no demoulding. Good oil resistance, acid and alkali resistance and wear resistance. Disadvantages: the color matching is difficult to be rough (especially from dark to bright), the hardness is limited, and the surface is rough, unlike plastic, which can achieve mirror effect. However, the cost of the mould is low and the cycle is fast. In the production of materials, magnetic powder can be added and modified into magnets to play the role of sound insulation and sealing.

Rubber used in furniture industry includes Ding Qing rubber and silica gel. Generally used in furniture, such as screen sound insulation tape, foot plug, vacuum sucker plug, guide rail shock absorber and so on.

3.3 resin

At present, there is a big trend of resin products, which are more and more used in furniture and building materials, such as artificial stone materials, artificial bathtubs, flame retardant plates, glass fiber reinforced plastics and other products on the market. Resin is an unsaturated polymer chemical, the raw material is mainly liquid, which is mixed with curing agent in the formula to produce polymerization reaction and solidified into solid by heating. Unlike plastics, grinding and recycling of workpieces cannot be used. Its cost and price are almost the same as PP, and the production process also needs casting, but the mold is simple, and it can be made of wood mold, gypsum mold, rubber mold and so on. It is especially suitable for products with changeable shapes, short cycle and low yield. Glass fiber reinforced plastic is a kind of furniture products.

(4) Glass products

Glass products can be divided into flat glass and blown glass according to different production processes. At present, the use of flat glass is large, especially after deep processing, which is more suitable for the consumer market. Crafts include blown glass and other three-dimensional shapes, and various shapes are used in classical furniture. Its characteristics: acid resistance (except fluoric acid), alkali resistance, oil resistance and fire resistance, and it can withstand up to 300℃ after tempering.

4. 1 flat glass

Flat glass is a kind of silicate raw material, which is formed by melting into liquid in a high temperature furnace at 1300℃ and then flowing over the surface of tin water, commonly known as float glass. Due to the difference of raw material formula and process parameters, the appearance of flat glass can be divided into three types: blue glass, white glass and colored glass. The thinner the flat glass (below 3mm), the more difficult it is to make, and the thicker it is (above 15mm), the higher the cost of both in the market.

Flat glass is cut with diamond (that is, ordinary glass cutter) and high-speed water. After the glass is cut, it can be ground on all sides, such as straight edge, bevel edge, round edge, duckbill and drilling, and the grinding price is high.

The surface of flat glass can also be frosted (chemical and mechanical), silk-screened, painted and carved. Different surface treatment processes have different prices, roughly from high to low: matte painting, silk screen painting, carving.

4.2 Processing glass

This paper mainly introduces the processing method of flat glass. In addition to the above-mentioned edging process, flat glass can also be treated by hot bending, tempering and bonding, so that the "plane" becomes a "three-dimensional" effect.

Hot bending: when the flat glass begins to soften at about 500℃, the required deformation effect can be achieved by gently pressing it with the mold. Different factories and equipment are inconsistent in the process of hot bending, and the flat glass after hot bending should be edged or sandblasted first.

Tempering: refers to the rapid cooling treatment of glass at about 900℃. Its characteristics are: there is no sharp corner after the glass is broken, the temperature resistance of the glass is improved to 300℃ without breaking, and the strength is greatly improved by about 10 times.

Bonding: refers to the use of UV glue, cured by ultraviolet radiation. After bonding, the glass can withstand more than 200 kilograms of tension. Bonding materials are glass and glass metal, but glue and technology are different to make qualified products.

The cost and price of the above three processing methods are in order from high to low: regenerative hot bending bonding.

4.3 Art Processing Glass

This paper mainly introduces the artistic processing method and effect of flat glass. As the name implies, "art" is glass processing with certain artistic effects.

Frosting effect: The flat glass is mechanically frosted, but the actual effect is that the frosted grains are too thick and easy to get hand marks, while the chemical frosting is made by soaking with fluorine-containing chemicals. Its advantage is that there are no handprints and fine sand, and various patterns and characters can be made by combining this process with the silk surface.

Embossing effect: Embossing refers to adopting various patterns and patterns in the mold, reaching the hot bending deformation temperature with glass and pressing by machine. At present, there are many kinds of patterns, and you can also design and make relief patterns yourself. Pressed glass is a special kind of hot bending.

Spraying effect: There are two kinds of spraying effects, one is transparent color effect, and the other is monochrome opaque effect. The essence of spraying is the effect of adding color to glass etchant, which will not change the surface of glass and does not involve the properties of glass structure.

Spray painting effect: that is, spray painting on the glass surface. In order to improve the adhesion of paint layer, the painted glass should be dried in an oven to achieve the effect of permanent adhesion.

Fireworks baking effect: the pattern is printed on the glass surface with transparent film, and then the film is carbonized after high temperature baking, and the pattern and characters remain on the surface.

(5) Sponge

There are many kinds of sponges used in furniture, such as foamed cotton, shaped cotton, rubber cotton and memory cotton.

5. 1 cotton suit

This material is made of polyurethane, mixed with various additives such as foaming agent, heated and pressed in a simple mold to press sponges with different shapes. Suitable for swivel chair sofa cushions and back cotton, and a few handrails are also special-shaped cotton. At present, the material density is 55#~60#, and its elasticity conforms to the relevant national standards.

The elasticity and hardness of sponge can be adjusted according to different parts of the product. Generally, the hardness and density of seat cotton are higher, followed by back cotton, which is softer.

5.2 hair gel

This material is foamed with polyether, just like foamed bread. Foaming can be done by mechanical equipment or wood-based panels. Foam cotton is like a square piece of bread. After slicing with slicer, the thickness can be cut according to different requirements, and the hardness of foam can be adjusted. Generally, 25~28kg/m5 is used for cotton setting, and 20~22kg/m3 is used for others.

Although the softness and hardness of sponge are directly related to the density, they are also related to the different formulations of additives, so the industry is divided into high elasticity, gray super, black gray super and soft cotton. When designing and using products, we should make reasonable and scientific collocation according to different shapes and structures. Sponges with different elasticity and density are generally distributed in the upper, middle and lower parts.

There is a material in the sponge called flame retardant sponge. In fact, before foaming the sponge, a flame retardant, such as chlorine and bromine, was added to the material formula, which made the sponge produce smoke when it caught fire and played a flame retardant role.

5.3 rubber cotton

A sponge is formed by foaming natural latex as the main material. It has rubber characteristics, excellent elasticity, good resilience and no deformation, but it is expensive, 3~4 times higher than foamed cotton.

The order of the prices of the above three kinds of cotton from high to low is: rubber cotton, setting cotton and foamed cotton.

5.4 Regenerated cotton

There is a kind of furniture product called "recycled cotton", which is actually extruded from sponge scraps. The cost is extremely low, but the elasticity is extremely poor and the density is different.

6. Leather

Leather is a big category in the national industrial industry, and there is also a set of corresponding standards.

6. 1 artificial leather

Commonly known as spun skin, it can be divided into type I (0.9~ 1.5m/m) and type II >:1.5mm.. There are many patterns in leather appearance, which generally require fine and uniform patterns, uniform colors and no scratches and cracks on the surface.

The essence of artificial leather is also polymer plastics such as PVC, PE, PP and so on. Blow with film and spray all kinds of color paste. The artificial leather used for sofa swivel chair pays great attention to hand feeling, and it should be smooth, soft, elastic and tasteless. Among them, the breaking length should be ≤80%, which is not easy to decolor, that is, the color fastness to rubbing should reach above 4.3.

6.2 Natural leather

Natural leather mainly refers to all kinds of processed animal skins. At present, cowhide is the main leather used in furniture, and its appearance is consistent with that of artificial leather, but its tensile strength and tear strength are better than that of artificial leather. The disadvantage is that the appearance pattern is uneven, especially calf leather, and there are polar scars, so the skin around the defect scar is inelastic. Natural leather is also divided into two layers according to its thickness. The first layer is the surface of animal skin, which has good elasticity and softness and high price, and its thickness is between 0.8~ 1.5. The second skin is animal skin except the surface skin. Its thickness varies from 2.8 to 3.5, and its elasticity is poor, but its strength is good, and its tensile strength is above 200N/M2.

(7) glue

There are many kinds of glues used in furniture products. Reasonable and proper selection of glue has great influence on product quality, especially durability quality. According to the different types of solvents, glue can be divided into water-based glue and solvent-based glue.

7. 1 aqueous adhesive

Water-based glue refers to glue whose solvent concentration can be adjusted by water. It uses water-based glue to bond fire-proof boards with plywood or particleboard in furniture and between boards, such as density board for doors and honeycomb paper for door cores. Its characteristics: low price and good environmental protection, but the bonding and curing time is more than 4 hours. The manufacturing cycle is long, the manufacturing operation is simple, and methods such as brushing and wiping can be adopted.

Due to the long processing cycle of water-based adhesive, it has a great influence on urgent orders. On the other hand, manual painting is easy to be uneven, leading to quality accidents such as foaming and local deformation.

7.2 solvent-based glue

At present, the solvent-based adhesive is made of benzene-free solvent, and the main body of the adhesive is polymer materials such as resin, and its viscosity curing time is faster than that of water-based adhesive. Its method can also be sprayed with a spray gun, so it saves time and effort and spreads the glue evenly.

At present, screen and screen cloth are bonded, and the sponge and cloth of seat and sofa are bonded by spraying glue, which can be placed or installed after spraying. The solvent-based adhesives used in solid wood products are mostly between solid wood (such as sofa legs) and between board and veneer. The curing form of solvent-based adhesive is different from that of water-based adhesive, the latter is to let water evaporate, while the former is mostly self-heating cured by the action of "oxygen" in the air or between internal molecules due to the action of oxygen. When using solvent glue to spray sponge, shaped cotton or different fabrics, the models used are different, mainly because the above materials are also polymer materials. Improper use will degum, blister and dehydrate. Adhesion test includes two major items: environmental temperature resistance test (high and low temperature) and weather resistance test (that is, ultraviolet aging irradiation). In addition, solvent-based adhesives can be divided into glass adhesives, metal adhesives, glass and metal adhesives.

(8) Cloth

The fabrics used in furniture products can be divided into two categories: synthetic fiber cloth and natural textile cloth. Generally, man-made fiber cloth is the majority.

8. 1 synthetic chemical fiber cloth

There are nine kinds of artificial fiber cloth: polyamide, polyester, polyurethane, polyurea, polyformaldehyde, polyacrylonitrile, polyvinyl acid, polyvinyl chloride and fluorine. In fact, the essence of man-made chemical fiber is that the above nine kinds of polymer materials (which belong to the same kind of raw materials as plastics) are woven by spinning. All quality indexes of chemical fiber cloth are divided into fineness, strength, resilience, hygroscopicity and initial modulus, and the first four indexes are important quality parameters.

Fineness is the degree of yarn thickness, and strength refers to the tensile force that can be withstood; Resilience refers to the ratio of returning to the original size after stretching; The initial modulus refers to the tensile force when the tensile length is 10% of the original length.

For users, that is, what kind of materials are useful to adapt to the conditions, are introduced as follows:

Materials with low hygroscopicity: polypropylene (polypropylene), vinylon and polyester, suitable for humid climate and regions.

Materials with good heat resistance: polyester, acrylic (acrylic), suitable for tropical and high temperature working environment.

Materials with good light resistance: acrylic, vinylon, polyester, products suitable for outdoor environment, such as beach chairs.

Materials with good alkali resistance: polyamide fiber, polypropylene fiber and chlorine fiber (PVC fiber).

Materials with good acid resistance: acrylic, polypropylene, polyester.

Not easy to mildew: dimensional wheel, polyester, nylon, suitable for wet places.

Materials with good wear resistance: PVC, PP, vinylon, polyester, polyamide fiber.

Materials with good ductility: PVC and vinylon.

From the above analysis and introduction, at present, the materials suitable for indoor swivel chairs are vinylon, polyvinyl chloride, polypropylene, polyamide and so on. And materials with poor light resistance should never be used outdoors, otherwise the service life will be short.

8.2 Natural fiber cloth

Natural fiber cloth includes cotton, hemp, wool and asbestos fiber, but only cotton and hemp are suitable for furniture. Natural fiber cloth is characterized by environmental protection, good warmth retention, good wear resistance, good alkali resistance of cotton and linen, but poor acid resistance of flax and poor light resistance of wool. Therefore, it is very important to choose the material design according to the above characteristics. The thickness of natural fiber cloth is slightly higher than that of artificial fiber.

(9) External decorative film covering

Because of the different design requirements, the plates and wood in furniture products should be processed with various decorative films. For example, screen products: we will launch the following new products:

9. 1 Boeing Software

This material is essentially PVC plastic film blowing molding, and the width and thickness are controlled by the film blowing machine and die head. At present, the thickness of plate surface coating is mostly 0. 18~0.22. The texture pattern on the surface of Boeing film is formed by molding process, and it is also coated with adhesive. Its characteristics are low cost and convenient use, but the disadvantage is that the temperature change during material molding leads to difficulties in color matching, and each batch is different. Because PVC is a flame retardant material, Boeing film also plays a surface flame retardant role after bonding, which is suitable for building materials. Disadvantages are poor adhesion, easy foaming and poor surface hardness, because individual oil stains are degummed when gluing. Therefore, the production environment of Boeing Film Factory determines the product quality.

9.2 decorative film

Decorative films include melamine paper and fireproof board film, both of which are polymer materials and are not flammable, so the pasted board is also called fireproof board or flame retardant board. MFC board is made of melamine paper and common board. Generally, it is processed with special equipment of the factory. The furniture factory can apply it to furniture after 8 hours of cold pressing with a cold press.

9.3 veneer

There are many kinds of wood bark, such as miscellaneous wood, beech bark, oak bark, walnut bark, maple bark, beech bark and so on. The thickness of wood veneer on the market is generally 0.3mm, but for products with high quality requirements, the surface of 0.3mm wood veneer is easy to break due to sanding after pasting, so high-quality products are generally pasted at 0.5 ~ 0.6 mm Wood veneer is coated with water-based adhesive and solvent-based adhesive, with water-based adhesive being used for large area and solvent-based adhesive being used for local or small area bonding of miscellaneous wood surface. Because of different tree species, the price of veneer is different. For example, the unit price of miscellaneous wood bark per square meter is 3-4 times different from that of walnut, and the bark price order is as follows: walnut maple/beech oak beech miscellaneous wood. The surface texture and wood grain nodes of wood skin vary with different places of origin. At present, there are two kinds of wood grain widely used: straight grain and mountain grain. There are many natural wood skins, but there are also artificial wood skins: technical wood. Its bark has clear lines and orderly arrangement, without wooden eyes and knots. Due to the difference of tree species and annual rings, the width of a single veneer is also different. Therefore, when processing and making veneers, it is necessary to repair them with flowers or patterns, which are similar to natural patterns after splicing. Wood veneer stitching is sewing with a "thread" like sewing clothes. This "thread" is actually a hot melt adhesive, which melts into glue when heated. It's called EVA glue, and it's also a thermoplastic.

(10) artificial board

There are many kinds of wood-based panels: plywood, joinery board, fiberboard, honeycomb board, flame retardant board (gypsum board, calcium silicate), aluminum-plastic board, beauty board, customizable board, decorative board, polaroid board and so on. Dimensions: 1220*2440(4 ft *6 ft), 1525*2440(6 ft *8 ft), 1850*2440, 1850*2880.

10. 1 plywood

Glued plywood is made of miscellaneous wood bark and glue through lamination, which is generally firmly pressed horizontally. The purpose is to enhance strength. Generally, the thickness above 12 cm requires more than 9 layers, and the thickness above 10 cm requires more than 5 layers. There are four kinds of glued plywood, namely, weather-resistant and moisture-resistant plywood is Grade I, water-resistant plywood is Grade II, moisture-resistant plywood is Grade III and moisture-resistant plywood is Grade III. The prices of different categories are quite different, so they should be matched according to different purposes.

The size specifications are: 9 15* 1220, 9 15* 1830, 9 15*2 135, 915 *.

10.2 joinery

Joinery is made by splicing core plates, and the two outer surfaces are glued together. This kind of board has higher nail holding power than plywood and particleboard. The size specifications are as follows: 9 15*9 15, 9 15* 1830, 9 15*2440, 1220*2440,/kloc. This kind of board is more expensive than plywood and particleboard. Suitable for high-grade cabinet products, the processing technology is similar to traditional solid wood.

10.3 honeycomb panel

Honeycomb board, also known as honeycomb paper, is made of about 200g kraft paper into a honeycomb shape. The stretchable products are divided into three grades: A, B and C. Its advantages are light weight and not easy to deform, but it can only be used alone when combined with medium density fiberboard or particleboard. And is particularly suitable for manufacturing deformation-resistant large-span table tops. Or a door core that is easily deformed by moisture. However, the production needs cold pressing or hot pressing, and the production efficiency is low.

10.4 fiberboard

Fiberboard is made of wood after fiber separation and hot pressing. According to density, it is divided into high density and medium density. Medium density fiberboard is commonly used, with a specific gravity of about 0.8. Its advantages are smooth surface, easy to stick Boeing film and spray tape, and difficult to absorb moisture and deform. Its disadvantage is that the effective drilling times are not as good as particleboard, and the price is 5~ 10% higher than particleboard.

10.5 flame retardant board

The fireproof board is mainly composed of industrial magnesium oxide raw materials, and its binder is resin material, so the cost is low. Flame retardant board is also called nonflammable board. Its processability is similar to that of particleboard and MDF. Soak without water absorption 12 hours. One is a fire-proof board with gypsum as the main raw material, which also has incombustible flame retardancy, but its hygroscopicity is poor, and it is easy to expand locally, even with drilling nails. The other is silicic acid board, which has the same flame retardant property, but its weight is 1.5 times higher than that of magnesium oxide non-flame retardant board, and its nail holding force is not good, which requires high strength for load-bearing structural parts and increases the cost.

10.6 aluminum-plastic board, beauty board

This kind of plate is a composite material. The surface of aluminum-plastic plate is inlaid with aluminum plate on the plastic plate, and the other is mainly vacuum aluminum plating on the plastic plate. These two boards are similar in cost and function, respectively. Meiban is a kind of aluminum-plastic board, which not only embeds an aluminum layer on the surface of the plastic board, but also processes various artistic patterns (that is, texture design differences) through die pressing. Aluminum-plastic board is characterized by fire prevention, light weight and bending. Disadvantages: the price is higher. The nail holding force is poor, and it can only be connected by glue or clamping process, and can only be used in some products.

10.7 particleboard

Particleboard is mainly made of wood chips and hot-pressed with rubber compound at a certain temperature. Wood chips include bark sawdust, bagasse, wood shavings and other main materials. General quality particleboard is made of wood shavings and consists of core layer, outer layer and transition layer. The outer layer contains high glue content, which can increase the nail holding power, prevent moisture and sand finish. In the process of particleboard processing, a certain amount of benzene-containing chemicals are produced, which are divided into E0, E 1 and E2. At the same time, moisture-proof particleboard is also separated from particleboard, and the price is slightly higher than that of ordinary particleboard.

10.8 foam board

Foam board is mainly made of one of PP, ABS, EPS and EVA. Because of the cost, PS and EVA are two kinds of foam board. Foam board can be used for sound insulation, pin insertion and other functions. It is especially suitable for structural parts with low strength and low load. It is necessary to choose suitable glue and different process parameters to bond the foaming board with Boeing film and cloth, otherwise foaming will occur.