초록 ▼

The invention relates to an apparatus for cleaning viscous materials, more particularly melted down scrap synthetic materials in a recycling process. The apparatus of the invention comprises a cleaning screen in the form of a strip which can be moved at right angles to the direction of flow of the m

The invention relates to an apparatus for cleaning viscous materials, more particularly melted down scrap synthetic materials in a recycling process. The apparatus of the invention comprises a cleaning screen in the form of a strip which can be moved at right angles to the direction of flow of the material to be cleaned, so that the soiled area of the screen may be replaced by a clean area. In order to prevent the synthetic material from escaping when the cleaning screen is advanced, the volume before the screen is enlarged. This reduces or eliminates the pressure upon the screen so that the strip can easily be displaced, with no escape of the viscous material from the gaps in which the cleaning screen is located.

대표청구항 ▼

A method of cleaning viscous materials, wherein said viscous materials are passed in the molten condition under pressure through a movable strip-shaped screen having an upstream face which retains impurities, comprising the following steps: a. reducing the pressure of the viscous material against th

A method of cleaning viscous materials, wherein said viscous materials are passed in the molten condition under pressure through a movable strip-shaped screen having an upstream face which retains impurities, comprising the following steps: a. reducing the pressure of the viscous material against the upstream face of said strip-shaped screen when the latter is obstructed by the impurities it retains; b. temporarily eliminating the sealing pressure between the strip-shaped screen and a first chamber which feeds the molten material through the strip-shaped screen and a second chamber which receives the filtered molten material; c. moving said strip-shaped screen crossways with respect to the direction of flow of said viscous material to replace a soiled area of the screen by a clean area; d. immobilizing the strip-shaped screen; e. resealing the first chamber, screen and second chamber together, the molten material upstream of said screen being simultaneously repressurized; and f. continuing to filter material through said strip-shaped screen; wherein the reduction of the pressure of the viscous material is achieved by increasing the original volume of said first chamber supplying the molten material to said strip-shaped screen, and repressurization of the viscous material is accomplished by restoring the first chamber to its original volume.