RAW MATERIALS

LThe raw materials used in manufacturing paper may be divided into 4 broad groups : fibrous raw materials, which constitute the main and indispensable element for paper manufacture; sizing material , used to add impermeability to paper according to the end use; loading agents, used to impart specific requisites to paper destined especially for printing; colouring agents, used to correct the base paper and for the production of coloured paper.

Type	Essences	Process
Coniferous or resinous trees	fir	commonly with bisulphite
	pine	commonly with sulphate
	larch	commonly with bisulphite
	cypress	commonly with sulphate
Leafy or broad leaved trees	poplar	with bisulphate, sulphate and soda
	beech	with bisulphate
	chestnut	with bisulphate and soda
	aspen	with bisulphate
	birch	with bisulphate
	eucalyptus	with sulphate
Graminaceous	wheat straw	with soda chlorate and monosulphate soda
	rice straw	with monosulphate soda
Annual Plants	alfa	with soda and soda chlorate
	esparto	with soda and soda chlorate
	cane	with bisulphate
	compact cotton / tufts	bland alkaline treatment
	combed cotton	bland alkaline treatment
	cotone linters	with soda
	hemp	with soda
	linen	with soda