Once all the measurements are recorded onto the data sheet, they are entered into the computer's Enclosures program. This program is one the Information Technology people here created on our request and instructions. This program instantly calculates the overall dimensions of the material needed, as well as the location of the creases.
However, these measurements can be calculated by anyone using simple arithmetic, and formulas for doing so are given here. (You will probably want to glance at these now and then come back to them after reading through the completion of the inner enclosure.)
L = Length of piece being enclosed
W = Width of same
T = Thickness of same
F = Length of flap, which is half the length of the piece being enclosed, or (.5L).
Overall dimensions:
Overall length of material needed = 2L + 2T + F
Overall width of material needed = W + T + 2cm
The 2cm of the width measurement is the "seam", the 2cm wide extension that overlaps and is adhered to the back of the enclosure's main body.
Creases:
Vertical, @:
1. W
2. W + T
Horizontal, @:
1. F
2. F + T
3. F + T + L
4. F + T + L + T
Here is an example with numbers, which should prove more helpful than mere formulas. Let's say our book measures 20cm long, 10 cm wide, and 1 cm thick. We will first calculate the overall dimensions of the material we need, and then we will calculate the locations of both the vertical and horizontal creases.
Overall length of material needed (formula) = 2L + 2T + F
2L (2 x 20cm = 40cm)
+ 2T (2 x 1cm = 2cm)
+ F (.5L = 10cm)
Overall width of material needed (formula)= (W + T + 2cm)
W (10cm)
+ T (1cm)
+ 2cm
Vertical creases, @:
1. W (10cm)
2. W (10cm) + T (1cm)
Horizontal creases, @:
1. F (10 cm)
2. F (10cm) + T (1cm)
3. F (10cm) + T (1cm) + L (20cm)
4. F (10cm) + T (1cm) + L (20cm) + T (1cm)
