Bleached Chemical Thermo-Mechanical Pulp (BCTMP) Softwood BCTMP is used for manufacturing products such as coated board grades, printing and writing paper and paper towel/napkin grades.

What is Bctmp pulp used for?

Bleached Chemical Thermo-Mechanical Pulp (BCTMP) Softwood BCTMP is used for manufacturing products such as coated board grades, printing and writing paper and paper towel/napkin grades.

What does Bctmp stand for?

Bleached Chemi-ThermoMechanical Pulp (BCTMP) is a pulp product used by the paper industry as a less-expensive alternative for Northern Bleached Softwood Kraft (NBSK).

Which hardwood fibers is easiest to bleach?

Aspen wood has a relatively low lignin content compared to other pulped hardwoods which makes the pulp easier to bleach. Bleached ECF pulps are available both at a standard brightness level(90% ISO) and sometimes higher brightness levels can be obtained(91-92% ISO).

What is CTMP process?

Chemithermomechanical pulp (CTMP) process involves application of chemicals to the chips before refining. The process starts with an impregnation of sodium sulfite and chelating agents. The mixture is then preheated at 120–130°C and refining follows.

What is high yield pulp?

High yield pulp (HYP) is produced at a yield over 85% from different pulpwoods or annual plants by means of mechanical or combined chemical and mechanical unit processes. The research area is of high industrial importance.

What is bleached hardwood kraft pulp?

Bleached Hardwood Kraft Pulp (BHKP) is commonly used in paperboard and specialty paper, as well as coated and uncoated papers and tissue. In many applications, hardwood pulp provides excellent strength and surface properties. Our hardwood pulp is used to make our Metsä Birch products.

How do you bleach wood pulp?

Alkaline hydrogen peroxide is the most commonly used bleaching agent for mechanical pulp. The amount of base such as sodium hydroxide is less than that used in bleaching chemical pulps and the temperatures are lower.

Was the time mechanical pulp was used?

Industrial mechanical pulping started in the 1840s with groundwood pulping, producing the pulp from grinding. This made wood fibers the main raw material in paper, instead of textile fibers. Later the chemical pulping processes started dominating for many paper types.

What is unbleached kraft pulp?

Unbleached kraft pulp is defined as a partially delignified pulp produced by incubation under specified conditions with ligninolytic fungi, which lowers the need for bleaching chemicals unbleached kraft paperboard is commonly used for attaining superior strength while packaging of heavy duty products.

Why is it better to use softwood for paper pulp?

Conifers like pine and spruce are softwood trees. They have long fibres at a low density. The long fibres give it strength, so softwood pulp is often used to create sturdy products. Softwood also increases absorbency and is used for absorbent products such as paper towels, baby diapers and other hygiene products.

What bleaches wood pulp?