Saturday, 29 December 2012
Chemical Bamboo Preservation
Chemical bamboo preservation (with or
without the help of special equipment) ensures long term protection. Depending
upon the method of bamboo treatment, chemical preservatives can impart short
term or long term protection.
With a few exceptions, chemical
preservatives to protect bamboo against biological attacks and degradation are toxic. Selection and application has to be done with great care to meet
performance, environment requirements and safetly.
Depending upon the carrier solvents,
bamboo preservatives are divided into 2 different categories: Non-fixing and fixing type preservatives. Non-fixing preservatives will leach out the bamboo
when exposed to rain. In other words non-fixing type preservatives are NOT suited for outdoor use.
Non-Fixing Type
Preservatives
Non-fixing bamboo preservatives mainly
consist of boron salts, which are effective against borers, termites and fungi
(except soft rot fungi). These boron salts are dissolved in water. After
treatment, the water evaporates leaving the salts inside the bamboo. They are not toxic and can be used for treating bamboo
products like baskets, dry containers, etc. which come in contact with food
products.
Boric Acid Borax
Curing bamboo with borax and boric acid
is the most popular bamboo preservation method (for indoor use) around the world because it is
effective and more environmentally friendly than other wood preservatives.
The combination of boric acid and borax
in a ratio of 1:1.5 is an alkaline salt called: Disodium octaborate
tetrahydrate (Na2B8O13 x 4H2O) and
is available in pre-mixed powder form.Disodium octaborate tetrahydrate is a white, odorless, powdered substance that is not flammable,
cumbustible, or explosive and has acute low oral and dermal toxicity. The
product itself is fire retardent and shows no hazardous
decomposition.
This salt, is used as
an insecticide and fungicide, and is also effective against fungi and algae. It
has an infinite shelf life and is not affected by temperature. Diluted with
water, bamboo can be impregnated, submerged or sprayed with
this chemical.
Formula
(1):
|
Formula
(2):
|
Recommended concentration:
- 4-5% indoor use (not exposed to weather or ground contact)
* How to Interpret the Terms: 'Ratio' and
'Concentration'?
The ratio of the chemical solution is based on kilograms per 100 liters of water.
For example, if you see this:
- boric acid / borax / sodium dichromate
- ratio 2:2:0.5
It actually means this:
- a mixture of 2 kg of boric acid / 2 kg of borax / 500 gr of sodium dichromate in 100 liters of water.
The above example is the equivalent of
4,5% concentration. If you want to ramp
this up to a concentration of 9% you just have to double the mixture like this:
- a mixture of 4 kg of boric acid / 4 kg of borax / 1 kg of sodium dichromate in 100 liters of water.
Fixing Type
Preservatives
These chemical bamboo preservation
formulations are proportionate mixtures of different salts which interact with
each other in the presence of bamboo and become chemically fixed. In principle,
the degree of fixation and efficacy depends upon the nature of the components
and their combination and concentration.
For example, Chromium is responsible
for fixation, copper is effective against decay fungi and soft rot and the
third compound acts against insect and fungus. The process of fixation requires
some weeks during which the material should be stored under cover. Slow
fixation is preferred in case of bamboo as it allows diffusion and better
distribution of preserving salts.
Copper Chrome Arsenic
(CCA)
CCA is a heavy duty broad spectrum
chemical bamboo preservative patented as AsCu. It has been found to provide
protection for 50 years or more. Outdoor use is recommended only due to the arsenic component, which can also causes
a green coloration on the bamboo.
Formula:
- arsenic pentoxide / copper sulphate / sodium dichromate
- ratio 1:3:4
Recommended concentration:
- 6% outdoor use (structures exposed to weather but not in contact with ground)
- 10% outdoor use (structures exposed to weather and in ground contact)
Copper Chrome Boron
(CCB)
CCB is a broad spectrum chemical bamboo
preservative and a good alternative to CCA, but less effective with a lower
degree of fixation, because of the boron component.
Formula:
- boric acid / copper sulphate / sodium dichromate
- ratio 1.5:3:4
Recommended concentration:
- 6-8% indoor use (not exposed to weather or ground contact)
- 8-10% outdoor use (structures exposed to weather and in ground contact)
Zinc Chrome
Zinc Chloride is highly hygroscopic and
treated bamboo will give a wet look in rainy season. This can adversely help
paints and other finishes.
Formula:
- Zinc chloride / sodium dichromate
- ratio 1:1
Recommended concentration:
- 10% outdoor use (structures exposed to weather and in ground contact)
Copper Chrome Acetic
Formula:
- copper sulphate / sodium dichromate / acetic acid
- ratio 5.6:5.6:0.25
Recommended concentration:
- 8% outdoor use (structures exposed to weather and in ground contact)
Fire Retardant
Preservative
This treatment is intended to protect
materials against fire as well as decay and insect attack.
Formula:
- boric acid / copper sulphate / zinc chloride / sodium dichromate
- ratio 3:1:5:6
Recommended concentration:
- 25% indoor and outdoor use
Oily Preservatives:
Creosote
It is a broad spectrum bamboo preservative and is a cost
effective chemical for treatment for exterior applications. It has been used
for treating railway sleepers and wooden poles.
Coal tar and creosote available from
coal is a dark brown viscous liquid. Creosote should be used exclusively for
pressure processes or hot and cold treatment. Being oily, it imparts water
repellence to the treated material. It is effective against fungal and insect
attack. Due to its dark brown color and bad odor, its use is restricted to exterior applications, especially in contact with mud/
ground.
Light Organic
Solvent-based Preservatives (LOSP)
These are slightly more expensive
bamboo preservatives where the organic solvent acts as a carrier for toxic
molecules and later evaporates, leaving the active ingredients behind. They are
available commercially in ready-to-use forms. A good formulation is an
appropriate mixture of fungicides and insecticides. There is little change of
color of the treated material but a residual odor may remain for some time. The
method of use will be recommended by the manufacturer. Formulations available
in concentrates are more economical to use.
Trichlorophenol (TCP)
It is a more eco friendly substitute
for Pentachlorophenol. Ready to use (5%) solution of this fungicide along with
insecticides for broad spectrum performance are commercially available.
Concentrates which can be diluted with mineral turpentine oil are more
economical for industrial use.
Copper/Zinc soaps
They have emerged as alternatives to
other organic preservatives which cause environmental hazards. Napthenates of
copper and zinc are most common (metallic soaps). They are available as
ready-to-use formulations containing appropriate amounts of insecticides. They
are slightly more expensive than TCP formulations. However, they are more
eco-friendly and also have no pungent smell.
Sources: The National Mission on
Bamboo Applications (NMBA)
Friday, 28 December 2012
ANALYTICAL RESEARCH ON PACE AND QUALITY OF GROWTH OF BAMBOO INDUSTRY
A SHORT
NOTE ON IDENTIFICATION, DEFINITION AND JUSTIFICATION OF AN IN-DEPTH AND
ANALYTICAL RESEARCH ON PACE AND QUALITY OF GROWTH OF BAMBOO INDUSTRY vis-a-vis
VARIOUS INSTITUTIONAL SUPPORT SERVICES IN THE NORTH EASTERN REGION
By Sanjive Deta Chetri Sharma
(Bambosorus)
_________________________________________________________________________________
The Research Problem
PROBLEM SITUATION
Handloom
and Handicraft are not only the mirrors of the country’s heritage and culture
but also possess vast potential for rural income generation. Yet, the most
noticeable characteristic of these two sectors is that they are highly
unorganized and informal. Further, the artisans, who have toiled hard to give the country a
place in the world map however live in very deplorable socioeconomic
conditions. Most of the national award
winning craftsmen whose exquisite crafts have helped India earn a place high
amongst those in the world are even barely capable of finding their
subsistence.
Against this backdrop, since the last century a good
number of support programs and experimental projects have been launched in our
country by a host of government, semi-government and non-government agencies
(both domestic and international) with a view to upgrading these sectors to
commercially viable industries and thereby create rural employment. But even
after completion of a decade from the turn of the century general feeling,
especially among the artisans themselves, is that even though all the programs
and projects undertaken so far by government and various other organizations
have, no doubt, brought about many positive changes in these sectors they are
still far from creating the desired impact.
Problem
Definition
Handloom and
Handicrafts have been playing an important role in the economies of the NE
states. According to a study sponsored by NEDFi (2002), NE contributes 19.18%
of total number of handicrafts units in India, 21.71% in terms of artisans and
79.58% in terms of value of production. Every 14th person in the NER
is dependent on handloom and handicraft products for livelihood. On an average
80% of the total income of those engaged in handloom and handicrafts sector
comes from this sector. From another angle, this sector provides more than 90%
of livelihood to around 61% of the total artisan households in the region. Every state in the region has some unique
items of production that have been highly appreciated within the country as
well as abroad. Handloom and handicrafts products from the NE are supposed to
have excellent brand value.
Despite, In Assam, for
that matter in the entire north eastern region, the handicraft sector has
always been suffering from the above problem situation and it is more
pronounced in bamboo sector as this sector accounts for the largest share of
the entire handicraft industry in the region.
Handicraft industry of
Assam and other north eastern states is still plagued with the conditions
identified by the planners of our economy during the early part of the post
independent period. Commercial
scale of production of handicrafts has not really begun in the region. Just a
simple review will reveal that
1.
Factor
conditions are not yet upgraded or enriched to the required level
2.
Demand
conditions are yet to be met and competitive advantage is never created
3.
Related and supporting industries have never come forward or felt
encouraged to produce inputs which are important and cost efficient for
innovation and internationalization.
4.
Sectoral strategies and structures have not been
geared to face competitiveness.
5.
The
artisans are never empowered to deal with the chance events
As a result, the handicraft sector of
the region can still be characterized by
·
Old skills and traditional technology
·
High capital output ratio due to inefficiency
of production system
·
Weak marketing power of the artisans (both at
the selling and buying points) and presence of and dependence on a large number
of intermediaries at various levels leading to market depressing producer-end
user relationship
·
Under developed or non-existent linkages
·
Minimum or non usage of new information and
knowledge
·
Absence of non-farm policy
·
Poor industrial culture (i.e. product design,
quality management, packaging, branding, certification etc.)
·
Inability to withstand competition
·
High dependence on informal financial sector
for credit and other financial services
The Problem Question and Rationale of the Research
The government and other organizations
pride themselves on providing high-quality, need based support services to
ameliorate the situation discussed above. Their service programs are
meticulously and scientifically designed, programs are both comprehensive and
diverse, service providing human resource is well trained, number of support
organizations is more than enough and flow of financial resource is well
sufficient.
In spite of above the
handicraft sector in the north eastern region has not, till today, come out of
the nascence and emerged as a full grown and inseparable segment of the industrial
scenario. Moreover, the artisans are still reeling under poverty, ill health,
illiteracy and ignorance.
So the glaring poser
is—What went wrong?!
An array of factors can
contribute to the situation; from ill conceived plans, top down,
non-participatory and non -holistic approach to detachment with ground
realities to not-so-coordinated actions and duplication of support programs to
the reasons yet to be discovered.
The situation certainly demands an in-depth and highly
analytical study on the pace and quality of the growth of handicraft industry
vis-a-vis available support services in the north eastern region.
Purpose
of the study
·
To carry out a Craft Production Process
Documentation
·
To
undertake an across-the-board value chain mapping exercise from identification
of the actors in the cluster involved in the business of craft production and
sales to raw material suppliers, master craftsmen, traders and other
intermediaries.
·
To
assess the status of factor conditions, demand conditions and competitive
advantage of the industry.
·
To
gauge the extent of contribution of related and supporting industries towards
innovation and internationalization.
·
To
review government’s sectoral strategies and structures in view of
competitiveness.
·
To
undertake a survey of artisans to create demographic profiles of artisans and
ancillary workers, including their geographic locations, existing and possible
clusters and economic conditions.
·
To
critically examine the effectiveness of various support services extended so
far by government and other organizations
·
To
offer recommendations/suggestions for future roadmap.
___________________________________________________________________
If all
stake holders are in agreement with the above discussion a detailed research
proposal with special focus on bamboo sector can be prepared and presented for
sponsorship.
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