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The production process of bamboo plywood
(
Update:
18/10/2013
)
With about 1,300 bamboo species are widely distributed throughout the northern and southern hemisphere , from sea level to high altitude 4000 - 5000m , is one of the groups NTFP value of many countries such as : China Korea , Japan , countries in South and Southeast Asia , including Vietnam .
Tre in Vietnam has been widely used for a long time in the construction of buildings , in transport ( as bridges and ferries , boats , array ) , instead of wood inserted in mines , in agriculture as farming tools ... Many common appliances in every household of Vietnam such as beds , mats , furniture , curtains , baskets , baskets , and chopsticks , toothpicks are made of bamboo . Every handicrafts , musical instruments made from bamboo material and become more and more goods for domestic consumption or export . Bamboo shoots are a popular dish of every citizen . Recently, bamboo is used in the manufacture of paper , audio processing board , plywood, charcoal ... The development of cultivation and processing of bamboo products has contributed to poverty alleviation, bring jobs and improve the lives of people , especially people in rural and mountainous areas .
With the value and benefits described above, bamboo has been identified as one of the group of NTFPs should be prioritized in the forest and NTFP development of Vietnam in the coming time . To provide experience in bamboo processing of countries around the world are looking forward to the experience of bamboo processing will be applied creatively in Vietnam and contribute
develop a much more valuable commodity economy , society and environment .
Here is the basic content of the production process of bamboo plywood layer as follows : Saw the clean polished bamboo handle slotted eyes peeled soft fruit drying facilities on the cell surface adhesive placement scan compression heat cut along the polished finished product .
1 . Saw the bamboo : Based on the length of bamboo products that cut into sections , usually on 8cm , 5cm thick .
2 . Shaved skin and intestine : Based on thermodynamics , to 0.2-0.5 mm shell removal , gutting 0.5 - 1mm , and removal of the eye . Then add the 2-3 pieces for easy experience . Noting the depth and width to ensure the placement of gaps , in addition to line engraving , groove to avoid cracking later , enhanced horizontal pressure .
3 . Handling of Applications : The purpose of the treatment of advanced soft elasticity of bamboo , while the less experienced gaps . Due to sliding against low intensity ( so 1630kg/cm2 vertical , horizontal direction 62kg/cm2 ) . The radius of curvature at a small spread , so , spread out the stress in tensile strength beyond horizontal , prone to cracking . Based on the properties of lignin and water content hemicenlulose raise the temperature of bamboo and bamboo itself , as this may increase the elasticity of the bamboo , reduce the fracture . So before spreading bamboo need heat treatment , mainly to improve the water content and temperature of the bamboo itself . Based on the research and production experience , with bamboo necessarily apply treatment to soften before cutting better . Heat treatment temperature should reach 120 - 140oC . Method of temperature rise are many , can be
use boiled or distilled or alkaline treatment temperature to soften the cellulose .
4 . Spread the stalks , dried shape : Based on the compression effect after processing software
experience of a flatbed semi-circular bamboo . After the flattened remains certain elasticity , water levels are still high . So after spending still just a precaution to keep the compression deformation back , then proceed to do so drying water content reaches the required technologies paste ( about 6-10 % ) to ensure stable shape .
5 security , convenience edge : After spending bamboo drying surface shape and thickness irregularities , should be part of the cell edge and convenient , the plane and the color . At the same time meet the requirements for placement to two straight edges .
6 . Sealant placement scan : Based on the scanning method to create glue boards to create different boards . Bamboo Body is directed specifically to stabilize the board , to prevent bending , and deformation defects and ensure that we have greater intensity greater hardness , bamboo pieces should ensure the following principles :
- The principle of symmetry : symmetry means that floor with two centers , thickness , bamboo , fiber direction , water levels , the stories are the same . That would ensure the stability plank .
- The principle of individual layers , due to the glue board bamboo fiber direction perpendicular to both consistent with the principle of symmetry , so the total number of stories have an odd leaf , such as warping boards will stress distribution evenly over the piece of bamboo .
- Bamboo Plywood is a kind of structures should have to tolerate the climate , so often choose to glue adhesive glue resin phenolaldehit to ensure water resistance and bear climate . The amount of glue around 350-400g/m2 scan .
7 . Compression of the heat : laminated bamboo boards but thick , but the small class , generally 3 classes and 5 classes . So technology can apply drag , thermal compression thick boards . Compression is 20-30kg/cm2 , compression temperature is 135 - 145oC , the 14 - time compression 24phut ( depending on the thickness determination ) . To ensure quality gummed , hypothermia can be divided into 3 stages , especially high pressure switch to balance , to reduce the pressure slowly , to have enough time in the steam escape game gradually , ensuring quality bamboo glued in layers . After the game , to put a thick layer of glue time to slowly freezing solid , solid eager to ensure enhanced adhesive resin , equilibrium water content , eliminating the stress , deformation precaution .
8 . Cutting edge polished : Depending on the size of the board requested that conducts cutting edges polished smooth vertical and horizontal , improve surface quality .
9 . The main feature of many layers of bamboo boards :
- Weight capacity relations with bamboo , old bamboo , compressed air , compression , generally about 0.74 to 090 .
- Water content , water content phenolaldehit used does not exceed 10 %
- Intensity gummed after boiling water 3 times larger 30kg/cm2 .
- Bending strength in the longitudinal direction in 1653 kg/cm2 , 266 kg/cm2 horizontal direction
- Impact Strength 8.3 tan/cm2 layer structure 3 , 5 layer structure tan/cm2 7.59 .
- The amount of friction elastic 1.01x105 Zhaobo Sustainability at temperatures 50 ° C , soaked for 1 hour 3 - hour - heated steam to cold ( - 12oC ) 20 hour - dried ( 100 ° C ) after 3 hours , 27 hours is all a treatment cycle acceleration so after 288 hours of game 3 elastic layer down 19.87 % , impact strength decreased by 24.9 % .
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