page contents

BLEACHED SOFTWOOD KRAFT PULP

Home/Paper Products/BLEACHED SOFTWOOD KRAFT PULP

BLEACHED SOFTWOOD KRAFT PULP

Bleached softwood kraft pulp

Bleached softwood kraft pulp . distinctively high-strength type of pulp, and a key building block of many familiar and important products in our daily lives. This includes such things as printing and writing papers; tissues, coffee filters and other consumer products; and specialized applications like fibre cement and Japanese washi paper.

The particular type of kraft pulp that Catalyst makes and sells is referred to as northern bleached softwood kraft or NBSK pulp. It’s sought-after for its diversity of applications, and for its strength, runnability, high bulk, porosity and other functional advantages.

The essential elements for making kraft pulp are wood fibre, water, chemicals and heat.

The Kraft Pulping Process

We make kraft pulp by mixing wood fibres with a solution of caustic soda and sodium sulphide, and cooking them inside a digester. This separates the fibres from the lignin, which is a natural glue-like substance that binds them together. Our production facilities are designed to recover and reuse much of the water, chemicals and steam used in the process.

Putting Sawmill Leftovers to Use

The fibre we use to make kraft pulp is mainly made up of leftovers from British Columbia lumber mills. These wood chips and shavings were once considered waste, and sent to landfills or burned. We match tree species and other pulp characteristics with customers’ end-use requirements, and control blending and bleaching to exacting specifications. The species we use include coastal hemlock, fir and cedar as well as interior whitewoods.

Environmental Assurance

As with all our products, our kraft pulp is made from responsibly sourced fibre and in facilities that have achieved sector-leading greenhouse gas reductions. We use a lower-impact elemental chlorine-free bleaching process. And with a PEFC1chain-of-custody system, we can provide pulp that is certified as originating from sustainably managed forests for those customers wishing additional assurance. Buy Bleached softwood kraft pulp

Product Description

Bleached softwood kraft pulp

Item Code: 45-170-Gsm

bleached softwood kraft pulp Being the leaders in the market, we are offering a wide gamut of Bleached Softwood Kraft Pulp that is used for making napkins, tissue papers and sanitary napkins. Our offered pulp is processed using the best quality cellulose fibers and advanced technology at vendors’ end. Provided pulp is acknowledged for its optimum quality and smooth texture. Apart from this, it is available in various specifications.

Specification

– It is used for packaging and cardboard, specialty paper and printing and writing applications
– It provides good strength, structure and surface properties
– It is especially suitable for printing and writing papers and tissues
– For printing and writing end-uses, it provides good surface and optical properties
– For tissues, it provides softness and smoothness

Environmental Assurance bleached softwood kraft pulp

As with all our products, our kraft pulp is made from responsibly sourced fibre and in facilities that have achieved sector-leading greenhouse gas reductions. We use a lower-impact elemental chlorine-free bleaching process. And with a PEFC1chain-of-custody system, we can provide pulp that is certified as originating from sustainably managed forests for those customers wishing additional assurance. Buy Bleached softwood kraft pulp

The Kraft Pulp Making Process

The Kraft Pulp Making Process

Wood Chips1. Wood Chips

The main ingredient of kraft pulp is wood fibre in the form of chips. A typical wood chip measures 40 x 25 x 10 mm, and is a leftover from lumber manufacturing. They are stored in a silo after delivery to the pulp mill. To produce pulp, the wood chips must be broken down into their individual cellulose fibres.

Digester and Blow Tank2. Digester and Blow Tank

A digester is a large tank, between three and six metres in diameter. Inside it, a combination of chemicals, heat and pressure dissolve the lignin and begin the process of converting chips to pulp. From the digester, the fibre goes into a blow tank, where a rapid change in pressure causes the wood to separate into individual fibres.

Screening and Washing3. Screening and Washing

Screens remove any fibre bundles that have failed to separate, and they are reprocessed. The pulp is also washed thoroughly to remove chemicals and dissolved lignin. The pulp, now a brown-coloured combination of individual wood fibres and water, is then stored to await bleaching.

Bleaching4. Bleaching

Bleaching is a five-step process of soaking and washing within a vertical tower, using a sequence of hydrogen peroxide, chlorine dioxide, oxygen and caustic soda. This both dissolves any remaining lignin and turns the brown pulp fibres white. We use an elemental chlorine-free bleaching process. Then it’s on to another storage tank to await pressing and drying.

Pressing and Drying5. Pressing and Drying

The pulp is now a slurry which is converted into sheets by being passed through a sheet former, where water is drained through a combination of gravity and suction. The sheets then pass through the press sections – which squeeze out more water – before heading for the dryer. Here, steam-heated air jets reduce water content to less than 10%.

Pulp Bales6. Pulp Bales

Once out of the dryer, sheets are immediately cooled to keep their colour consistent. They are then cut into smaller sheets and baled. A hydraulic press compacts the bales before they are wrapped for shipment to customers. Bales typically measure 81 x 85 x 38 cm and weigh 250 kg.


Catalyst sells its kraft pulp externally to customers around the world. Each of Catalyst’s mills also produce a type of mechanical pulp, referred to as thermo-mechanical pulp or TMP, for use in making their own paper products (see “How we Make Paper“).

Reviews

There are no reviews yet.

Be the first to review “BLEACHED SOFTWOOD KRAFT PULP”

Your email address will not be published. Required fields are marked *

Verification: cc3eb2d8b20cf6f9 google-site-verification=zpbsmZkI7wNDvyhCmiZwKqlACEvbNMMMW7MBeX4zXfs