There are so many kinds of trash cans, For example, trash cans used in sanitation and sanitation systems, large in size, The 240L trash can has reinforced turning edge and bucket cover fixing holes, Garbage can plastic piece is a end cover part, With relatively thin walls, Easy to pull the deformation, Easy top deformation, Generally using plastic mold integrated injection molding molding, But trash can parts are often because after forming, cooling shrinkage, Ctightly around the core, In the process of moulmolding, Due to the large force area of the lateral walls, Make the huge friction between the product and the surface of the core exist, When the top rod is pushed out of the product, It is difficult to emerge, Thimble bending, Thimble tops the product out of the white dot defect settings to top the product through.