Separable laminated container and associated technology

A method of punching an air suction hole in a separable laminated container, comprising steps of:

• inserting a pedestal into a neck of a container body made up of an inner layer and an outer layer that are made of synthetic resin and separably laminated of each other, and positioning the pedestal in contact with an inner surface of the neck, the pedestal supported by a pedestal support member;
• driving a punch from an outside of the container body onto the neck to punch out the outer layer with a blade of said punch while leaving the inner layer behind, the punch supported by a punch support member, at least one bolt extending through the punch support member, the at least one bolt being in contact with the pedestal support member;
• and
• keeping a distance between the blade and the pedestal when said punch is at the nearest position to the pedestal.

A punching device, comprising:

• (a) a pedestal which is inserted into a neck of a container body made up of an inner layer and an outer layer that are made of synthetic resin and separably laminated on each other, the pedestal being positioned to be in contact with an inner surface of the neck;
• (b) a punch supported by a punch support member in such a manner as to come close to and move away from said pedestal, the punch having a tubulous blade;
• and
• (c) a space keeping mechanism for keeping a distance between the tubulous blade and the pedestal constant when said punch is at the nearest position to the pedestal, the space keeping mechanism including a pedestal support member that supports the pedestal and at least one bolt extending through the punch support member, the at least one bolt being in contact with the pedestal support member, such that the at least one bolt and the pedestal support member maintains the distance between the pedestal and the tubulous blade.