English to Finnish Tech/Engineering Engineering: Industrial Injection molding machines

Mitä tarkoittaa tämä ruiskuvalukoneissa käytetty termi daylight?

Esimerkiksi tässä yhteydessä:

As far as the mould thickness that can be accommodated between the machine platens is concerned, a distinction is made between open or maximum daylight and closed daylight. Open daylight is the maximum distance between stationary and movable.