Abstract: A fluid injection and exhaust needle for use in gas injection moulding comprising a needle with two separate flow channels; a fluid inlet channel and a fluid outlet channel; wherein gas is injected into the melt via the fluid inlet channel to form a gas cavity in the melt, and gas is simultaneously exhausted from the cavity via the fluid outlet channel.

Abstract: A method of coating an article during injection molding wherein coating material carried by a high pressure carrier gas is blasted at high velocity directly onto the internal walls of a closed mold and then a plastics substrate is injected into the coated mold to form in-situ a coated molded product.

Abstract: A gas injection moulding method comprising injecting a melt into a mould and injecting gas into the melt to form a gas cavity in the melt wherein the melt is cooled by use of injection gas cooled to below the external ambient air temperature and/or by a continuous flow of injection gas through the mould.

Abstract: A gas venting needle for use in gas injection moulding the open end having a flow valve with no moving parts; the flow valve being provided by a plurality of individual flow channels sized such that in use gas may freely flow through these channels but liquid moulding material may not freely flow through.

Abstract: A gas injection moulding method comprising injecting a melt into a mould and injecting gas into the melt to form a gas cavity in the melt, wherein the melt is cooled by use of injection gas cooled to below the external ambient air temperature and/or by a continuous flow of injection gas through the mould.

Abstract: A painted plastics article in the form of a vehicle wing comprises a polypropylene substrate with a polyamide or polyester coating formed by dual injection or blow moulding. The coating makes the wing suitable for subsequent painting which may be carried out on a normal vehicle paint line used to paint a metal body-in-white. To promote adhesion between the polypropylene substrate and the coating, the substrate includes an admixture of a compatibiliser such as a maleic anhydride grafted polypropylene.

Abstract: A lubricant for working aluminium comprising essentially an aqueous solution ofA. a secondary alkylamine, in which at least one of the alkyl groups includes a chain of at least 8 carbon atoms, the secondary alkylamine including a carboxylic acid group as a substituent at a carbon atom not more than 3 atoms distant from the amino group andB. an acid phosphate mono- or di- ester of a polyalkylene oxide surface active agent,Said alkylamine and said acid phosphate ester each having a solubility of at least 1/2% by weight in water and said solution including at least 1/2% by weight of said alkylamine and said acid phosphate ester.