The premium choice for specialty, high strength / low bulk uses.
Characteristics
Tensile Strength:Birch is the strongest hardwood species available, developing tensile double that of mixed northern hardwoods and close to that of southern softwoods, with significantly lower energy requirements.
Opacity: Birch has a low refined opacity, and is suitable for applications where translucency is desired. The higher coarseness of a hardwood species combined with a low cross-sectional area produces a very dense, well-formed sheet. Elemental chlorine free (ECF).
Value-Added Features
Birch is an ideal substitute for softwood in a furnish. Its long, collapsible fibers develop tears and tensiles similar to those of softwood fibers, with significantly lower energy requirements.
Pure Benefits
- Strongest of the hardwood species
- Developing tensile is double that of Northern mixed
- Significantly lower energy required to develop tensiles
Ideal Applications
- Release papers
- Electrographic papers
- Glassine/grease-proof papers
- Overlay for deco papers
- Other technical specialties
End-use Benefits
- High tensile and tear
- Low bulk
- High stiffness and freeness
- Low opacity
Wood Species (Typical)
| Softwood | 3% - 5% |
| Birch | Remaining |
Typical Pulp Properties**
| Brightness (ISO) | 90 (89 min) |
| Dirt (ppm) | 0.1 |
| Viscosity (cp) | 7-9 |
| Fiber Length* (mm) | 1.0-1.2 |
| Coarseness** (mg/m) | 0.113 |
| DCM Extractives (%) | 0.039 |
| Ash (550° C) (%) | 0.24 |
| Air Dry (%) | 93 |
| * Kajaani FS-200 **FQA |
Shipping Data
| Dimensions | Inches | cm |
| Length | 33 | 83 |
| Width | 33 | 83 |
| Height | 16.5 | 41.9 |
| Weight | 580 lb. / 263 kg | |
| Wrapping: Single wrapped with pulp | ||
| Wires: | Domestic | 1 x 1 |
| Export | 1 x 2 | |
| Export Package: | 8 bales/unit |
PFI Mill Handsheet Data
| Revolutions | Units | 0 | 250 | 1000 | 2000 | 3000 |
| Freeness |
CSF, (ml) | 636 | 586 | 476 | 411 | 250 |
| Bulk |
(cc/g) | 1.84 | 1.70 | 1.56 | 1.48 | 1.40 |
| Burst Factor |
10 | 20 | 35 | 43 | 55 | |
| Burst Index |
(kPa-m²/g) | 0.95 | 1.98 | 3.42 | 4.19 | 5.39 |
| Tear Factor |
61 | 97 | 93 | 97 | 96 | |
| Tear Index |
(mN-m²/g) | 5.99 | 9.54 | 9.13 | 9.51 | 9.42 |
| Breaking Length |
(m) | 2110 | 3600 | 5530 | 6470 | 7750 |
| Tensile Index |
(Nm/g) | 20.7 | 35.3 | 54.2 | 63.5 | 76.0 |
| Tappi Opacity |
% | 75.4 | 73.2 | 70.6 | 69.1 | 68.1 |
Pfi
