§ 17
How much fibre and resin should I use?
Answer: A laminated orthosis shell or socket consists of fibre (glass, carbon, perlon) and resin. Fibre amount is area times number of layers times fibre's weight per area (g/m²). Resin depends on the fibre share you aim for: at 50% fibre by weight you need as much resin as fibre. In vacuum lamination some excess is sucked out, so the calculator adds waste allowance to the resin. Hardener and pigment are calculated later in the laminating resin calculator.
Fiber (g) = areal (m²) × lag × arealvægt (g/m²); 10.000 cm² = 1 m²
Harpiks i skallen (g) = fiber × (100 − fiberandel) ÷ fiberandel
Harpiks der skal blandes = harpiks i skallen × (1 + spild ÷ 100)
Skallens vægt = fiber × 100 ÷ fiberandel
| Symbol | Meaning | Unit |
|---|---|---|
| areal_cm2 | Shell area | cm² |
| lag | Number of layers of fibre | lag |
| arealvaegt_g_m2 | Fibre's area weight (from the datasheet) | g/m² |
| fiberandel_pct | Fibre fraction in the finished shell (weight) | % |
| spild_pct | Resin waste (cup, excess that is sucked out) | % |
| = | Resin to be mixed | g |
| = | Total fibre | g |
| = | Resin that stays in the shell | g |
| = | Shell weight (approx.) | g |
Does not apply when
The calculator's own default values inserted. The figures are calculated with exactly the formula the tool uses.
Substituted
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Du bruger den, når du skal laminere et hylster eller en skal og vil vide, hvor meget fiber og harpiks du skal bruge.
Et hylster har ca. 1.500 cm². Du bruger 4 lag på 200 g/m² og sigter mod 50 % fiber med 20 % spild.
It means: Du skal bruge 120 g fiber og blande 144 g harpiks. Skallen vejer ca. 240 g.
En lille skal på 900 cm² skal have 6 lag kulfiber på 400 g/m². Du sigter mod 45 % fiber og regner 25 % spild.
It means: Det kræver 216 g fiber og 330 g harpiks. Skallen vejer ca. 480 g.
Ved 50 % fiber skal der lige så meget harpiks som fiber.
Vej skallen efter hærdning, og sammenlign med det beregnede.