What is CTMP paper?
HT-CTMP (High Temperature – Chemi-ThermoMechanical Pulp) -> Link to data sheet. The result is a pulp with fibers that are more intact and have a very low shive content (fewer bundles of fibers). The binding quality of the pulp is slightly reduced, but the bulk is greatly increased.
How is mechanical pulp made?
Mechanical pulping produces pulp through the use of mechanical energy instead of chemicals. Mechanical pulps can be produced by grinding logs or refining chips. Mechanical pulping processes use water for screening, cleaning, and showers on thickeners and grinding stones.
Which are 4 broad categories of pulping processes?
Explanation: Following are the four broad categories of pulping: Chemical, semi-chemical, chemi-mechanical, and mechanical. These are in increasing order of mechanical energy required to separate fibers and decreasing reliance on chemical action. 3.
What is chemi-mechanical pulping?
Chemi-mechanical pulp is a pulping process that separates fibrous materials by combining three ways like chemical, heat and mechanical. Pulp yield of chemi-mechanical pulp is about 80~90%. APMP is short for alkaline peroxide mechanical pulp, which is a kind of new technology for high yield of paper pulp.
What is groundwood pulp?
An alternate term for a type of paper pulp produced by mechanically grinding logs of wood against a rotating stone (also called mechanical pulp; see mechanical pulping).
How are papers made?
Paper is made in two steps:
- Cellulose fibers are extracted from a variety of sources and converted to pulp.
- Pulp is combined with water and placed on a paper making machine where it is flattened, dried, and cut into sheets and rolls.
How is pulp made?
Pulp is made from breaking down the fibrous part of plants, primarily trees or recycled paper, and refers to the main ingredient in the papermaking process. Pulp made from trees (wood fiber) is the most common source of fiber for papermaking and the base for many paper and wood products.
What is the meaning of pulping in the papermaking process?
Pulping is the process where fibers are separated and treated to produce pulp. The wet pulp is then converted into paper at an integrated pulp and paper mill or is dried and transported from the pulp mill to a paper mill. Different pulping processes are used depending on the fiber material and the desired end product.
What is the difference between mechanical and chemical pulp?
Mechanical pulping uses mostly mechanical energy to separate fibers and develop pulp properties. Chemical pulping uses mostly chemical energy, (from chemical reactions), to separate the fibers and to develop basic pulp properties.
What is Bctmp used for?
Softwood BCTMP is used for manufacturing products such as coated board grades, printing and writing paper and paper towel/napkin grades. Hardwood BCTMP is produced at our Slave Lake mill. It’s recognized for quality levels suitable for the production of coated board grades, printing and writing papers.
What are the sub-processes in CTMP pulping?
The key sub-processes in CTMP pulping cover all the way from chip preparation, high-consistency refining, steam recovery, fractionation, treatment of long fiber fraction, bleaching and dewatering to pulp storage prior to papermaking process or drying and baling for market pulp.
How are wood chips used in the CTMP process?
In the CTMP production process, wood chips are first impregnated with chemicals (sulfite and/or sodium hydroxide) and preheated at 90 to 150 °C to help soften the adhesive material (lignin) between the fibers. The chips are then refined mechanically in the pressurized refiner to produce pulp.
What are the advantages of the CTMP process?
The CTMP processes provide excellent bulk properties of paper at a high production capacity.
How does the chemithermechanical pulping process take place?
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.