Cross Laminated Film For Bitumen Waterproof Membranes
Cross Laminated Film For Bitumen Waterproof Membranes
Description:
OUR THREE STEP PROCESS FOR MANUFACTURING HIGH STRENGTH,
DURABILITY, AND QUALITY PLASTIC FILMS IS THE KEY TO SUCCESS.
Step 1: Extrusion
► High density polyethylene resin (HDPE) is extruded via the blown film process
to form a tube. The tube is cooled and collapsed into a flat tube.
► After the tube is flattened, it is fed into a multi stage orienter. During orientation,
the film is stretched in the machine direction aligning the polyethylene molecules.
The resulting film is very strong in the machine direction.
► The oriented tube is then annealed and wound up. The annealing step removes
stress in the film and controls shrinkage.
The annealed film retains its high MD strength.
Step 2: Spiral Cutting
► The next step of the process is spiral cutting. In this step, the flattened, oriented
tube in unrolled, rotated and re-inflated to form a round tube.
► As the film is fed forward and rotated, it is cut on a bias (around 45 degrees) and
wound up. The spiral cut film’s orientation is at 45 degrees to the machine direction.
Step 3: Cross Lamination
► Finished spiral cut rolls are mounted on corresponding spindles.
► Films are fed through and laminated with an extruder with their orientation directions
crossed at 90 degrees. The films are laminated together with a layer of polyethylene.
► After lamination, film is surface treated for ink adhesion and graphic purposes. Finally,
the film is wound on a core to estimated yardage.
Parameter:
| NO. | Item | Performance | ||
| SDM-30 | SDM-60 | |||
| 1 | Tensile Property | Tensile Strength/Mpa ≥ | 30 | 50 |
| MaxF/(N/50mm) ≥ | 200 | 300 | ||
| Elongation as MaxF/% ≥ | 200 | |||
| Elongation at break/% ≥ | 250 | |||
| 2 | Sample number of no broken tested by free-falling dart method ≥ | 8 | ||
| 3 | Tear Strength(Nail Shank)/N ≥ | 60 | ||
| 4 | Angle Tear Strength/N ≥ | 25 | ||
| 5 | Thermal Stability | 120 ℃,10min, No bulb, No deformation | ||
| 6 | Cryogenic Flexibility ℃ |
-35℃, No fissure, No delamination |
||
| 7 | Thermal Ageing | Appearance | No bulb, No deformation | |
| Subsequent MaxF/% ≥ | 80 | |||
| Elongation at MaxF/% ≥ | 200 | |||
| Elongation at break/% ≥ | 200 | |||
| 8 | Artificial Weathering | Appearance | No bulb, No deformation | |
| Subsequent MaxF/% ≥ | 70 | |||
| Elongation at MaxF/% ≥ | 180 | |||
| Elongation at break/% ≥ | 180 | |||
Why Cross Laminated?
- Puncture Resistance: less accidental damage
- Thermal Dimensional Stability: No fish-mouthing or controlled shrinkage
- Cold temperature resistant down to -30°C/-20°C
- Cross laminated film allows waterproofing membranes to bridge gaps in sheathing
- Resistant to damage from incidental movement and settling of the roof
- UV Stability for typical job site exposure
Application:
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