When implementing these side openings the open/close mould becomes a mould  with slides. Slides are moving components inside the injection mould. One or more  parts of the mould contour are incorporated into these slides. The slide itself moves  away from the plastic part during or after the opening of the mould in an additional  demoulding direction. Through this movement the undercuts are released before  the plastic part is ejected from the injection mould. The required path is calculated  and defined in advance. It must be large enough so that the plastic piece drops out  of or can be removed from the injection mould without damage after the ejection. In Figure 2.11 the slide for demoulding the side opening on our container is shown.  In the front area of the slide a part of the mould contour of the plastic part is incorporated. The round surface in front has contact with the fixed insert when the  mould is closed and is injected. During injection, this contact prevents that the  plastic covers this spot and thus forms the bore holes in the plastic part. In technical language, this contact point is also called an aperture.

To move this slide there are two possibilities. The first possibility is that the slide  is connected with a hydraulic cylinder which is in turn screwed tightly to the injection mould. The slide is moved via this cylinder. For this solution the cylinder  covers a clearly defined distance. It is bought and installed as a standard part. Find  out more in Section 4.2. The second option is the forced control through an inclined  pin. The pin is installed with a defined inclination on the fixed half of the injection  mould. The front part of the inclined pin submerges in the moving slide. When the  mould opens in the main demoulding direction, through the resulting movement  this inclined pin moves the slide in an additional demoulding direction. There are  additional details in Section 4.2. Figure 2.12 displays the closed mould on the left and the slightly open mould on  the right. On the slightly open mould the inclined pin has moved the slide in an  additional demoulding direction to the end position.