Qualities[ edit ] Normal kraft paper is strong and relatively coarse. Kraft process and Paper machine Wood pulp for sack paper is made from softwood by the kraft process.
All types of wood, including very resinous types like southern pine and non-wood species like bamboo and kenaf can be used in the kraft process.
Sack kraft paper, or just sack paper, is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability. It is made of clean low kappa hardwood kraft and has to have a good uniformity and formation.
Twisting paper is mostly opaque and often supercalendered. This is done by high fiber orientation on the papermachine. The long fibers provide the paper its strength and wet strength chemicals are added to even further improve the strength. A paper sack can be made of several layers of sack paper depending on the toughness needed.
This paper needs a high tensile strength in the machine direction, which is the axial direction of the cartridges. Maintaining a high effective sulfur ratio or sulfidity is important for the highest possible strength using the kraft process.
In the cross direction, the cartridge is supported by the gun-pipe, but a sufficient elongation is needed. The raw material is normally softwood pulp from the kraft process.
These papers require a good strength, with highly oriented fibers. Absorbent kraft paper is made with controlled absorbency, i. Hunting cartridge paper is a kraft paper used in shotgun shells.
Microcrepping is done by drying with loose draws allowing it to shrink. It has high tensile strength. The paper is microcrepped to give porosity and elasticity. Both white and brown grades are made. This paper requires the best possible machine direction strength and cross machine elongation.
The kraft process can use a wider range of fiber sources than most other pulping processes. Kraft paper is produced on paper machines with moderate machine speeds. Sack paper is then produced on a paper machine from the wood pulp.Shop Note Card Cafe at the Amazon Arts, Crafts & Sewing store.
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Table top device that feeds a roll of paper through a choke point to instantly crumple and cut kraft paper rolls; One dispenser per purchase; Black. Kraft paper or kraft is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process.
Sack kraft paper, or just sack paper, is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability. Pulp produced by the kraft process is stronger .Download