Plastic house mould

We have made several sets of plastic house mould for garden, and several sets of plastic house for kids garden, the same questions are: to make the plast house mould's slides moving smoothly? to make the good filling for the big plastic house large size wall mould and complex roof mould?
3.How to avoid the long slide bending when press by the injection pressure?
4.How to make the plastic house mould automatic ejections? please come to see our company's mould design for plastic house moulds.