Mar. 8th, 2022
Are we helping against the global warming by choosing bamboo based products?
Bamboo is the fastest-growing and most versatile plant on Earth. For centuries,
bamboo has played an indispensable part in the daily life of millions of people in
tropical countries. In the last decades, it has gained increasing importance as aline height 1.3
substitute for timber.
There are over 1,000 described uses of bamboo. Bamboo provides food, renew
able raw material, and regenerative energy. Culms have excellent technological
properties and are used for construction, scaffolding, handicraft products, furniture,
and as material for secondary products such as bamboo mats, boards, or flooring.
Woody bamboos, or the “tree grasses,” are a cultural and ecological feature of many
countries of Asia, America, and Africa, where bamboos can provide environmental,
social, and economic benefits. Bamboo is a multipurpose plant—it can substitute
for timber in many respects due to its lignified culms, and because of its fast growth,
intricate rhizome system, and sustainability, it has become a plant with conserva
tion value, able to mitigate phenomena that result from global climate change.
Bamboo is also an essential resource for many other organisms, not just pandas.
Bamboo, like rice, maize, wheat, and sugar cane, is another important grass
inextricably linked to human livelihood, fulfilling needs for shelter, food, paper,
and more; the range of its use is hardly rivaled in the plant kingdom—not for
nothing is bamboo known as “the plant of a thousand uses.” Bamboos are complex
plants that can be difficult to identify or classify. But one thing is certain bamboo forest can act as a carbon sink.
Mar. 16th, 2022
How bamboo furniture are made?
Bamboo’s uniquely fast growth, moisture wicking fibers and ease of cultivation have made it a popular choice for people looking for a more sustainable option.
We will have a look at the process that bamboo go through before it become a finished and polished products ready to be used in your daily life.
The newly harvested bamboo stems are cut into strips (panels), those bamboo panels are available in 4-by-8-foot sheets or narrower 16-by-72-inch panels, with thickness ranges from 2 to 19 millimeters.
The bamboo panels need to go through few steps before lamination:
The time and temperature requirements for preserving will vary according to bamboo species and desired heat penetration. Most manufacturers boil strips at a temperature of 100°C for at least 24 hours. In addition boiling also increases the moisture content of the core of the sections, which is beneficial to further air-drying and kiln drying. Also, internal stress in the strip will be release while boiling.
Some customers prefer bamboo products with light to deep brown coloration. These colors can be produced by steaming the strips in a pressure tank, which is heated by steam. At certain temperatures, some chemical components (e.g. lignin) will deepen their color. The higher the temperature and the longer they are steamed, the deeper the color they take on. Usually the section will take on a chestnut-color at a pressure of 3-5 kg/cm2 for 90-105 minutes.
The moisture content of boiled or steamed strips is about 100%. It is generally desirable to dry the bamboo before use because dry bamboo is stronger and less susceptible to degradation (biological, thermal or chemical) than wet bamboo.sections are either air-dried, kiln dried or both.
The sections have excellent dimensional stability after drying.. At this time, they can be planed to the required thicknesses and widths. A precision planer is the ideal machine for this. It is equipped with four blades, two horizontal and two vertical, and can plane all four surfaces of each strip at the same time to predetermined dimensions. It also smoothes the surface.
The bamboo strips are now ready for lamination process:
Adhesive is spread on the plane and edge surfaces of the graded and classified sections. The most common adhesive in the laminated bamboo industry is urea-formaldehyde resin. The glue is applied to the sections using a variety of techniques including roller spreaders, spray-lines, curtain coaters and brushes. Each of these techniques has its advantages and disadvantages, depending upon the type of manufacturing operation under consideration. Roller glue spreaders are employed in most factories because of their low price, efficiency and stability.
Sections are assembled (laid up) into laminated blanks immediately after application of adhesive. This must be done rapidly and carefully. Speed in assembly is necessary because the glued sections must be placed under pressure within certain time limits or they will dry out and become ineffective. Careful workmanship is required to lay up the face, core and back strips correctly.
Assembled units are loaded into the hot press, where hydraulic rams press the assembled units in two directions, horizontal and vertical, exerting a pressure of 1.2-1.4 MPa. The temperature of the hot press is usually set in the range 100-1650 C.
After hot pressing, many mills post-press the units. This is performed in a cold press which consists of one stationary platform and one connected to hydraulic rams. The load is held under pressure for several hours to maintain the shape and dimensions of the unit.
After all those steps bamboo is almost done and we are ready to make your favorite furniture, the laminated bamboo need just to be shaped and polished.