Week 1

30 july 2019

Faculty:Siddhant shah.

Some natural and man made materials.

1.cork

□Cork is an impermeable buoyant material, the phellem layer of bark tissue that is harvested from commercial use primarily from quercus suber.

□Cork is composed of Suberin, a hydrophobic substance. Due to its impermeable, buoyant, elastic and fire retardant properties, it is used in variety of products.

□Cork industry is generally regarded as environmentally friendly. Cork production is considered sustainable. It is an excellent gasket material.

2.Wood:-

◇Wood is a porous and fibrous structural tissue found in the stems and roots of the trees and other woody plants. It is an organic material, a natural composite of cellulose fibres,that are strong in tension and embedded in matrix of lignin that resists compression.

◇wood has been used for fuel, as a construction material for making tools and weapons, furniture and paper.

◇Hardwood is preferred over softwood because it creates less smoke and burns longer. It is also used as raw material as fiberboard (MDF).

3.cardboard

☆Cardboard is a generic term for heavy duty paper based products having greater thickness and superior durability.

☆The construction can range from a thick sheet known as paperboard to corrugated fiberboard which is made of multiple corrugated and flat layers.

4.paperboard.

■ Paperboard is a paper based material mostly used for playing cards, which require a very rigid single sheet with high surface durability and printability.

5. Different boards.

1.Chromo board

2.corrugated cardboard

3.newsprint paper

1.chromoboard:

It is a thin board, coated on one or both sides and is white and smooth.

2.corrugated cardboard:

It is made by pressing a piece of carton board in hot corrugators.

3.newsprint paper:

It is a low cost, non archival paper consisting mainly of wood pulp and most commonly used to print newspapers and other publications and advertising material.

6.Tissue paper

●Tissue paper is a light weight paper. It can be made from recycled paper pulp.

●key properties are absorbency, basis weight,thickness,brightness,stretch, appearance and comfort.

7. Synthetic fibre-

♤These are made by humans with chemical synthesis, as composed to natural fibres that humans get from living organisms with little or no chemical changes.

♤synthetic fibres are created by a process known as polymerization which includes combining monomers to make a long chains.

8. Iron filings:

♧Iron filings are small pieces of iron that look like a light powder.They are often used in science demonstrations to show the direction of magnetic field. ♧the south attracts the north pole and repels another south pole.

9.Non crystalline glassy solid.

♡It is a specific subset of non crystalline state and contains no long range order,but it’s short range order is increased by the freezing of gross molecular or segmental motion.

♡It is the vitreous state which encompasses materials that are cooled rapidly.

10.Fibre

☆ Fibre is a natural or synthetic substance that is significantly longer than it is wide. Fibres are often used in the manufacture of other materials.

☆Synthetic fibres can often be produced very cheaply and in large amounts compared to natural fibres.

11.plastic

■It is a material consisting of wide range of synthetic or semi synthetic organic compounds that are malleable.

■plasticity is the general property of all those materials which can deform inversibily without breaking but in the class of moldable polymers their actual name drives from this ability.