Method for producing a two chamber pressure pack and a device for carrying out the same

A device for manufacturing a pressurized two-chambered container in form of a rotationally symmetrical aerosol can, comprising a blank for a rotationally symmetrical aluminum aerosol can, said blank being entirely open at at least one end;

• means for inserting a flexible and fluid-tight diaphragm into said blank through said entirely open end;
• means for forming a housing having an opening for releasing product therefrom and for reforming an edge of said open end by narrowing it into a mouthpiece enclosing said opening;
• means for fastening an edge of said diaphragm tightly to said housing while keeping a chamber therein charged with a product and communicating with the product release opening and separate from a chamber therein charged with propellant;
• and means for manipulating a thermoplastic pouch comprising said diaphragm raised by compressed air or tappet through an opening in the end of said housing remote from said product release opening until said edge of said pouch projects beyond the end of the product release opening, where it can be fastened by tool means.

A method of manufacturing a pressurized two-chambered container and in particular a rotationally symmetrical aerosol can, comprising the steps of:

• forming a housing with an opening sealable tightly by a barrier in form of a spray-or-aerosol valve;
• forming a product chamber and a propellant chamber separated fluid-tight from each other by a flexible diaphragm in said housing;
• charging said product chamber with a product, said product in said can being releasable through said valve, said propellant chamber being chargeable with a compressed propellant;
• communicating said product chamber with the product-release opening;
• leaving open at least one end of a blank to constitute subsequently said housing with said propellant chamber and said product chamber;
• inserting said diaphragm into said blank through the open end;
• and
• forming thereafter said blank into said housing;
• reforming an edge of said open end of said blank to narrow it into an integral mouthpiece accommodating said product-release opening, when forming said blank into said housing;
• said mouthpiece being integral with said housing, said mouthpiece being formed from a cylindrical form to a conical form after insertion of said diaphragm, said diaphragm being applied at said edge, said mouthpiece being reformed by pressing and by bending, upsetting or rolling said edge, said edge comprising a bead, said blank being of aluminum, said end of said blank being opposite the end left open and being formed into a base with a bore to manipulate said diaphragm therethrough, said product chamber being separated from said propellant chamber by securing an edge of said diaphragm tight to said housing, said diaphragm being a thermoplastic pouch;
• securing an edge of said thermoplastic pouch to said housing by fusion after said housing has been formed;
• fastening an edge of said pouch to said first-mentioned edge of the product-release opening wrapping said edge of said pouch over said first-mentioned edge;
• lifting said pouch to allow said edge of said pouch to be fastened or wrapped;
• lifting said pouch by manipulating said pouch with compressed air or a tappet extending through said bore, said edge of said pouch being secured and attached by a head;
• distributing first heated segments around said head at an equal angle, said segments grasping said edge of said pouch and preliminarily securing said edge of said pouch to part of an inner surface of said housing and second, once the pouch has been preliminarily secured, wrapping said edge of said pouch over the edge of the product-release opening, plasticizing and attaching said edge of said pouch tightly to said edge of said product-release opening by an expanding heated tool.