374 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS and has its place in industry for use on containers of certain types of heavy lubricating oils and like materials. An asset in its use is that it can be conveniently re-used, but in re-use, however, it would be unsuitable for journeys unless a fresh sealing ring is put on. ALUMINIUM FOIL SEAL WITH COMPOSITION CORK LINERS These are being used to some extent in the sterilised milk bottling trade and to a limited extent in the wine bottling trade, in the latter principally on miniature bottles. Foil caps are made in situ from strip aluminium, a composition cork disc being automatically inserted and the cap rolled on filled bottles. A tab is made on the cap for easy tear-off removal. The cork liner in this instance does play a very important part, and unless it is of good quality an effective seal for sterilisation purposes, in particular, will not be made. Although it is suitable for the bottling of sterilised milk, this type of closure is not used for any other large-scale bottling purpose in Britain, probably because of its fragility and because it will not withstand the internal pressures encountered in carbonated beverage bottling. PLASTICS FOR PACKAGING A Lecture delivered to the Society on Thursday, February 9th, 1956 L. F. BULL, M.I.E.I., A.M.I.E.E.* PLASTICS IN many different forms have very rapidly become established in the field of packaging because of properties which make them particularly valuable for such applications. The term "plastics," moreover, is a generic one like metals, which covers a very wide variety of dissimilar materials ranging from those for really solid containers to coating solutions, trans- parent film and expanded substances for the protective embedment of articles. Methods of producing completed packages with these materials are equally varied. They can be compression, transfer, or injection moulded, extruded, calendered, or cast into sheet, extrusion blown and used as a medium for dip coating. This range of techniques includes both those capable of producing to close tolerances the smallest mouldings such as a closure cap for a scent bottle to a very large container or housing. * British Resin Products, Ltd., Mayfair Place, London, W. 1.

374 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS and has its place in industry for use on containers of certain types of heavy lubricating oils and like materials. An asset in its use is that it can be conveniently re-used, but in re-use, however, it would be unsuitable for journeys unless a fresh sealing ring is put on. ALUMINIUM FOIL SEAL WITH COMPOSITION CORK LINERS These are being used to some extent in the sterilised milk bottling trade and to a limited extent in the wine bottling trade, in the latter principally on miniature bottles. Foil caps are made in situ from strip aluminium, a composition cork disc being automatically inserted and the cap rolled on filled bottles. A tab is made on the cap for easy tear-off removal. The cork liner in this instance does play a very important part, and unless it is of good quality an effective seal for sterilisation purposes, in particular, will not be made. Although it is suitable for the bottling of sterilised milk, this type of closure is not used for any other large-scale bottling purpose in Britain, probably because of its fragility and because it will not withstand the internal pressures encountered in carbonated beverage bottling. PLASTICS FOR PACKAGING A Lecture delivered to the Society on Thursday, February 9th, 1956 L. F. BULL, M.I.E.I., A.M.I.E.E.* PLASTICS IN many different forms have very rapidly become established in the field of packaging because of properties which make them particularly valuable for such applications. The term "plastics," moreover, is a generic one like metals, which covers a very wide variety of dissimilar materials ranging from those for really solid containers to coating solutions, trans- parent film and expanded substances for the protective embedment of articles. Methods of producing completed packages with these materials are equally varied. They can be compression, transfer, or injection moulded, extruded, calendered, or cast into sheet, extrusion blown and used as a medium for dip coating. This range of techniques includes both those capable of producing to close tolerances the smallest mouldings such as a closure cap for a scent bottle to a very large container or housing. * British Resin Products, Ltd., Mayfair Place, London, W. 1.