Method of providing durable, slick sliding surfaces on extrusion forming apparatus, and the product thereof
AssigneeGeneral Electric Company
InventorsMaurice Prober, Joseph Edward Vostovich
Life of this patent
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Abstract
The provision of a durable, slick sliding surface on metal faces of plastic forming extrusion apparatus such as extruder nozzles and dies. The durable, slick sliding metal surface is provided by burnishing and heat treating a polysiloxane fluid on the face of the metal. The burnishing comprises vigorous rubbing of the polysiloxane fluid treated metal face with a material relatively softer than the metal face being treated, effectively over the entire surface treated.
Claims12
A method of treating a metal face of an extrusion forming apparatus to provide thereon a durable, slick sliding surface, comprising applying polysiloxane fluid to the metal face, burnishing the metal face having the siloxane fluid thereon by vigorous rubbing of the polysiloxane fluid treated metal face with a material relatively softer than the metal face being treated, effectively over the entire surface treated, and heating the burnished metal face with the siloxane thereon to a temperature of at least about 150.degree.C.
A method of treating a metal face of an extrusion forming apparatus to provide thereon a durable, slick sliding surface, comprising applying polysiloxane fluid having a viscosity of from about 50 to about 1000 centistokes to a metal face of an extrusion forming apparatus, burnishing the metal face having the polysiloxane fluid thereon by vigorous rubbing of the polysiloxane fluid treated metal face with a material relatively softer than the metal face being treated effectively over the entire surface treated, and heating the burnished metal face with the polysiloxane thereon to a temperature of about 200.degree.C to 300.degree.C.
An extrusion forming apparatus having a metal face thereof provided with a durable, slick sliding surface comprising the product of applying a polysiloxane fluid to the metal face of the extrusion forming apparatus, burnishing the metal face having the polysiloxane fluid thereon by vigorous rubbing of the polysiloxane fluid treated metal face with a material relatively softer than the metal face being treated effectively over the entire surface treated, and heating the burnished metal face with the polysiloxane thereon to a temperature of at least about 150.degree.C.
An extrusion forming apparatus having a metal face thereof provided with a durable, slick sliding surface comprising the product of applying a dimethyl polysiloxane fluid having a viscosity of from about 100 to about 350 centistokes to the metal face of the extrusion forming apparatus, burnishing the metal face having the dimethyl polysiloxane fluid thereon by vigorous rubbing of the polysiloxane fluid treated metal face with a material relatively softer than the metal face being treated effectively over the entire surface treated, and heating the burnished metal face with the dimethyl polysiloxane thereon to a temperature of about 200.degree.C to about 300.degree.C.
Dependencies are inferred from the claim text.