Double chamber aerosol container and manufacturing method therefor

A method for manufacturing a double chamber aerosol container comprising the steps of:

• inserting a container cap having a valve assembly in an inner periphery of an opening of an expandable inner sack and fitting the container cap to the inner sack at the opening, the inner sack and the container cap constituting a liquid container;
• inserting the inner sack suspended from the container cap in an outer container and temporarily fitting the container cap to a bead portion of the outer container without permanently securing the container cap to the bead portion where a lower end of the inner sack does not contact a bottom of a hollow interior of the outer container;
• coupling the outer container with a filling head for a propellant:
• lifting the container cap with the inner sack attached thereto upward from the bead portion to form a filling gap between the inner sack attached to the container cap and the bead portion;
• introducing the propellant into a space between the outer container and the inner sack via the filling gap;
• securing the container cap and the outer container to each other together with the inner sack therebetween by clinching the container cap to the bead portion;
• and
• filling contents within the inner sack by way of the valve assembly.