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Packaging

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This is done by high fiber orientation on the paper machine.	Bruce 2024-12-1	019	Bruce 2024-12-1 09:17
This paper requires the best possible machine direction strength and cross machine elongation.	Bruce 2024-12-1	022	Bruce 2024-12-1 09:17
Spinning kraft paper is an especially strong type of kraft paper with relatively low grammage (40 g/m2).	Bruce 2024-12-1	024	Bruce 2024-12-1 09:17
Absorbent kraft paper is made with controlled absorbency (i.e. a high degree of porosity). It is made of clean low kappa hardwood kraft and has to have a good uniformity and formation.	Bruce 2024-12-1	018	Bruce 2024-12-1 09:16
Normal kraft paper is strong and relatively coarse. It has high tensile strength. The grammage is normally 40�C135 g/m2.	Bruce 2024-12-1	017	Bruce 2024-12-1 09:16
All types of wood, including very resinous types like southern pine,[5] and non-wood species like bamboo and kenaf can be used in the kraft process.	Bruce 2024-12-1	023	Bruce 2024-12-1 09:16
The kraft process can use a wider range of fiber sources than most other pulping processes.	Bruce 2024-12-1	016	Bruce 2024-12-1 09:16
The raw material is normally softwood pulp from the kraft process.	Bruce 2024-12-1	042	Bruce 2024-12-1 09:16
Kraft paper is produced on paper machines with moderate machine speeds.	Bruce 2024-12-1	021	Bruce 2024-12-1 09:15
A paper sack can be made of several layers of sack paper depending on the toughness needed.	Bruce 2024-12-1	022	Bruce 2024-12-1 09:15
Zein coatings are also water resistant but allow better recyclability.	Bruce 2024-12-1	0119	Bruce 2024-12-1 09:15
The paper may be coated with polyethylene (PE) to ensure an effective barrier against moisture, grease and bacteria, although recyclability is hindered.	Bruce 2024-12-1	019	Bruce 2024-12-1 09:15
Machine direction elongation can be further improved by pressing between very elastic cylinders causing more microcrepping.	Bruce 2024-12-1	017	Bruce 2024-12-1 09:15
This causes the paper to elongate 4% in the machine direction and 10% in the cross direction without breaking	Bruce 2024-12-1	020	Bruce 2024-12-1 09:15
Microcrepping is done by drying with loose draws allowing it to shrink.	Bruce 2024-12-1	018	Bruce 2024-12-1 09:14
The paper is microcrepped to give porosity and elasticity.	Bruce 2024-12-1	023	Bruce 2024-12-1 09:14
Sack paper is then produced on a paper machine from the wood pulp.	Bruce 2024-12-1	020	Bruce 2024-12-1 09:14
The long fibers provide the paper its strength and wet strength chemicals are added to even further improve the strength.	Bruce 2024-12-1	017	Bruce 2024-12-1 09:14
Wood pulp for sack paper is made from softwood by the kraft process	Bruce 2024-12-1	022	Bruce 2024-12-1 09:14
Fully bleached kraft pulp is used to make high quality paper where strength, whiteness, and resistance to yellowing are important.	Bruce 2024-12-1	016	Bruce 2024-12-1 09:14

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