INTRODUCTION

LOCATION: BSCIC Industrial Estate, Kushtia, Bangladesh
COMMUNICATION: Linked with national highway & Jhenidah-
Kushtia highway.
MAN POWER: The industry has an approached set up for 30 hands
on one furnace basis of which industry presently works with 20
officers & 50 staffs & 350 workers.
BUILD UP AREAS: about 4 acres.

Products of MRS INDUSTRIES LTD.

Copper & Aluminium Wire ROD
Copper Stripes
Wire Drawing Dies
PlyWood ( made of soft wood )
Particle Board ( made of both soft and hard wood )

Plywood
Plywood is a sheet material made of three or more thin layers of wood veneer bonded together with an adhesive. Each layer of wood, or ply, is usually oriented with its grain running at right angles to the adjacent layer in order to reduce the shrinkage and improve the strength of the finished piece. Most plywood is pressed into large, flat sheets used in building construction. Other plywood pieces may be formed into simple or compound curves for use in furniture, boats, and aircraft. It is one of the most widely used wood products.  All plywoods bind resin and wood fiber sheets (cellulose cells are long, strong and thin) to
form a composite material. This alternation of the grain is called cross-graining and has several important benefits: it reduces the tendency of wood to split when nailed at the edges; it reduces expansion and shrinkage, providing improved dimensional stability; and it makes the strength of the panel consistent across all directions. It is flexible, inexpensive, workable, reusable and can usually be locally manufactured. Ply wood is used instead of plain wood because of its resistance to cracking, shrinkage and twisting/warping, and its general high degree of strength.

Types
Different varieties of plywood exist for different applications:

Softwood plywood
Softwood panel is usually made either of cedar, Douglas fir or spruce, pine, and fir (collectively known as spruce-pine-fir or SPF) or redwood and is typically used for construction and industrial purposes. The most common dimension is 1.2m × 2.4m or the slightly larger imperial dimension of 4 feet × 8 feet. Plies vary in thickness from 1.4 mm to 4.3 mm. The number of plies depends on the thickness and grade of the sheet but at least three are required as the minimum odd number of plies. Roofing can use the thinner 5/8″ (15 mm) plywood. Subfloors are at least 3/4″ (18 mm) thick, the thickness depending on the distance between floor joists. Plywood for flooring applications is often tongue and groove; This prevents one board from moving up or down relative to its neighbor, so providing a solid feeling floor when the joints do not lie over joists. T&G plywood is usually found in the 1/2″ to 1″ (12–25 mm) range

Hardwood plywood
Hardwood plywood is made out of wood from angiosperm trees and used for demanding end uses. Hardwood plywood is characterized by its excellent strength, stiffness and resistance to creep. It has a high planar shear strength and impact resistance, which make it especiallysuitable for heavy-duty floor and wall structures. Oriented plywood construction has a high wheel-carrying capacity. Hardwood plywood has excellent surface hardness, and damaged wear-resistance.

Tropical plywood
Tropical plywood is made of mixed species of tropical wood. Originally from the Asian region, it is now also manufactured in African and South American countries. Tropical plywood is superior to softwood plywood due to its density, strength, evenness of layers, and high quality. It is usually sold at a premium in many markets if manufactured with high standards. Tropical plywood is widely used in the UK, Japan, United States, Taiwan, Korea, Dubai, and other countries worldwide. It is the preferred choice for construction purposes in many regions due to its low cost. However, many countries’ forests have been overharvested, including the Philippines, Malaysia and Indonesia, largely due to the demand for
plywood production and export.

Aircraft plywood
High-strength plywood also known as aircraft plywood, is made from mahogany and/or birch, and uses adhesives with increased resistance to heat and humidity. It was used for several World War II fighter aircraft. Although the British-built Mosquito bomber, nicknamed “The Wooden Wonder”, was constructed of a plywood monocoque, this was formed in moulds from individual veneers of birch, balsa and birch rather than machined from pre-laminated plywood sheets. Structural aircraft-grade plywood is more commonly manufactured from African mahogany or American birch veneers that are bonded together in a hot press over hardwood cores of basswood or poplar. Basswood is another type of aviation-grade plywood that is lighter and more flexible than mahogany and birch plywood but has slightly less[citation needed] structural
strength. All[where?] aviation-grade plywood is manufactured to specifications outlined in MILP- 607, which calls for shear testing after immersion in boiling water for three hours to verify the adhesive qualities between the plies and meets specifications.

Decorative plywood (overlaid plywood)

Usually faced with hardwood, including ash, oak, red oak, birch, maple, mahogany, Philippine mahogany (often called lauan, luan or meranti and having no relation to true mahogany), rose wood, teak and a large number of other hardwoods. However, Formica, metal and resin-impregnated paper or fabric bonded are also added on top of plywood at both side as a kind of ready for use in the decoration field. This plywood is a lot easier to dye and draw on than any other plywoods.

Flexible plywood
Flexible plywood is very flexible and is designed for making curved parts. In the UK this is sometimes known as “Hatters Ply” as it was used to make stovepipe hats in Victorian times It is also often referred to as “Bendy Ply” due to its flexibility. However these may not be termed plywood in some countries because the basic description of plywood is layers of veneered wood laid on top of each other with the grain of each layer perpendicular to the grain of the next. In the U.S.A, the terms “Bender Board” and “Wiggle Board” are commonly used.

Marine plywood
Marine plywood is manufactured from durable face and core veneers, with few defects so it performs longer in humid and wet conditions and resists delaminating and fungal attack. Its construction is such that it can be used in environments where it is exposed to moisture for long periods. More recently, tropical producers have become dominant in the marine plywood market. Okoumé from Gabon is now the accepted standard for marine plywood, even though the wood is not very resistant to rot and decay. Each wood veneer will be from tropical hardwoods, have negligible core gap, limiting the chance of trapping water in the plywood and hence providing a solid and stable glue bond. It uses an exterior Water and Boil
Proof (WBP) glue similar to most exterior plywoods. Marine plywood can be graded as being compliant with BS 1088, which is a British Standard for marine plywood. There are few international standards for grading marine plywood and most of the standards are voluntary. Some marine plywood has a Lloyd’s of London stamp that certifies it to be BS 1088 compliant. Some plywood is also labeled based on the wood used to manufacture it. Examples of this are Okoumé or Meranti. Marine plywood is frequently used in the construction of docks and boats. It is much more expensive than standard plywood: the cost for a typical 4-foot by 8-foot 1/2-inch thick board is roughly $75 to $100 U.S. or around $2.50 per square foot, which is about three times as expensive as standard plywood.

Other plywoods
Other types of plywoods include fire-retardant, moisture-resistant, wire mesh, sign-grade and pressure-treated. However, the plywood may be treated with various chemicals to improve the plywood’s fireproofing. Each of these products is designed to fill a need in industry.

RAW MATERIALS

  • Cathod copper
  • Aluminium ingot
  • Wood sheet resin

Produceduction of Aluminium rod by hot rolled method in Properzi plant
In the Properzi method, aluminium ingots are charged in melting furnace, each charge consisting of 2500 pounds which takes about 30 minutes for melting. After the ingots are subjected to the melting process, the aluminium is transferred to the holding furnaces, from where it is taken to the holding pot. The metal which it poured is cooled by water sprays, as a result of which it is solidified and emerges in the form of a continuous bar. The bar is rolled and comes out in the form of a hot rolled rod of 9.5 mm. diameter in continuous length. This rod is known as Properzi Rod.

The Manufacturing Process of Plywood
Plywood production requires a good log, called a peeler, which is generally straighter and
larger in diameter than one required for processing into dimensioned lumber by a sawmill.
The log is laid horizontally and rotated about its long axis while a long blade is pressed into
it, causing a thin layer of wood to peel off (much as a continuous sheet of paper from a roll).
An adjustable nosebar, which may be solid or a roller, is pressed against the log during
rotation, to create a “gap” for veneer to pass through between the knife and the nosebar. The
nosebar partly compresses the wood as it is peeled; it controls vibration of the peeling knife;
and assists in keeping the veneer being peeled to an accurate thickness. In this way the log is
peeled into sheets of veneer, which are then cut to the desired oversize dimensions, to allow it
to shrink (depending on wood species) when dried. The sheets are then patched, graded,
glued together and then baked in a press at a temperature of at least 140 °C (284 °F), and at a
pressure of up to 1.9 MPa (280 psi) (but more commonly 200 psi) to form the plywood panel.
The panel can then be patched, have minor surface defects such as splits or small knot holes
filled, re-sized, sanded or otherwise refinished, depending on the market for which it is
intended.
Plywood for indoor use generally uses the less expensive urea-formaldehyde glue, which has
limited water resistance, while outdoor and marine-grade plywood are designed to withstand
rot, and use a water resistant phenol-formaldehyde glue to prevent delamination and to retain
strength in high humidity.

PARTICLE BOARD PREPARATION

Manufacturing
Particle board or chipboard is manufactured by mixing wood particles or flakes together with
a resin and forming the mixture into a sheet. The raw material to be used for the particles is
fed into a disc chipper with between four and sixteen radially arranged blades (the chips from
disk chippers are more uniform in shape and size than from other types of wood chipper).
The particles are then dried, after which any oversized or undersized particles are screened
out.
Resin is then sprayed through nozzles onto the particles. There are several types of resins that
are commonly used. Amino, formaldehyde based resins are the best performing when
considering cost and ease of use. Urea Melamine resins are used to offer water resistance
with increased melamine offering enhanced resistance. is typically used where the panel is
used in external applications due to the increased water resistance offered by phenolic resins
and also the colour of the resin resulting in a darker panel. Melamine Urea phenolic
formaldehyde resins exist as a compromise. To enhance the panel properties even further the
use of resorcinol resins typically mixed with phenolic resins are used, but this is usually used
with plywood for marine applications and a rare occasion in panel production.
Panel production involves various other chemicals—including wax, dyes, wetting agents,
release agents—to make the final product water resistant, fireproof, insect proof, or to give it
some other quality.
Once the resin has been mixed with the particles, the liquid mixture is made into a sheet. A
weighing device notes the weight of flakes, and they are distributed into position by rotating
rakes. In graded-density particleboard, the flakes are spread by an air jet that throws finer
particles further than coarse ones. Two such jets, reversed, allow the particles to build up
from fine to coarse and back to fine.
The sheets formed are then cold-compressed to reduce their thickness and make them easier
to transport. Later, they are compressed again, under pressures between 2 and 3 megapascals
(290 and 440 psi) and temperatures between 140 and 220 °C (284 and 428 °F). This process
sets and hardens the glue. All aspects of this entire process must be carefully controlled to
ensure the correct size, density and consistency of the board.
The boards are then cooled, trimmed and sanded. They can then be sold as raw board or
surface improved through the addition of a wood veneer or laminate surface.

Particle board
Particle board, also known as particleboard and chipboard, is an engineered wood product
manufactured from wood chips, sawmill shavings, or even sawdust, and a synthetic resin or
other suitable binder, which is pressed and extruded. Particleboard is a composite material.
Characteristics
The cross section of a particle board
Particleboard is cheaper, denser and more uniform than conventional wood and plywood and
is substituted for them when appearance and strength are less important than cost. However,
particleboard can be made more attractive by painting or the use of wood veneers onto
surfaces that will be visible. Though it is denser than conventional wood, it is the lightest and
weakest type of fiberboard, except for insulation board. Medium-density fibreboard and
hardboard, also called high-density fiberboard, are stronger and denser than particleboard.
Different grades of particleboard have different densities, with higher density connoting
greater strength and greater resistance to failure of screw fasteners.
A major disadvantage of particleboard is that it is very prone to expansion and discoloration
due to moisture, particularly when it is not covered with paint or another sealer. Therefore, it
is rarely used outdoors or places that have high levels of moisture, with the exception of some
bathrooms, kitchens and laundries, where it is commonly used as an underlayment beneath a
continuous sheet of vinyl flooring. It does, however, have some advantages when it comes to
constructing the cabinet box and shelves. For example, it is well suited for attaching cabinet
door hinges to the sides of frameless cabinets. Plywood has the potential to feather off in
sheaves when extreme weight is placed on the hinges. In contrast, particle board holds the
screws in place under similar weight.

MRS Industries Limited Business Mission
 To provided utmost satisfaction to the consumer through best quality and customer
care.
 To continuously upgrade the product through innovations and convergence of new
technology and to produce the best quality at the lowest cost.
 To safeguard and enhance shareholder value.
 To respect the dignity of all employees and together to become instrumental in the
development of the country while protecting the environment.
 To utilise the surpluses for the welfare of employees and the society at large .

Conclusion

MRS Industries Limited products are now being widely used all over Bangladesh in most of
the factories with reliability & prestige, to manufacture Overhead Conductors and Electrical
wires & cables. This industry firmly believes in continuous improvement in quality and has
been awarded the ISO – 9001:2008.

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