Seal gasket element for a mixing apparatus and method for obtaining and applying the same

Abstract

A method for obtaining and applying a sealing gasket element (1) on a slide-valve (2) sliding in a cavity (3) of an apparatus (M) for the recirculation and mixing of chemically reactive polymeric components, comprises the steps of: obtaining from an elastic-plastic material a precursor element (P) of the seal element (1), with a grid structure having a reticular shape; positioning the precursor element (P) around the slide-valve (2); exerting on the precursor element (P), through temporary clamping elements (C1, C2, C3; C4), a radial compression and contraction action to insert it and couple it to one or more housing seats (S) provided on the slide-valve (2) so as to obtain the seal element (1) well coupled to the latter; progressively removing the clamping elements (C1 ,C2, C3; C4) to sequentially release successive parts of the gasket element (1) and gradually free the slide-valve (2) to gradually introduce the parts of the slide-valve (2) - freed in succession - in the housing cavity (3) allowing the sealing gasket element (1) to gradually expand radially due to the elastic return by adhering tightly to the inner surface of the same housing cavity (3). The special equipment forfitting the sealing gasket element (1) on the slide-valve (2) and the so obtained recirculation and mixing apparatus (M) is also described.

Description

technical field [0001] The present invention relates to a gasket element for a recirculation and mixing device and a method for obtaining such a gasket element and applying it to a recirculation and mixing device, more particularly Ground includes a high pressure mixing head for polymer components suitable for forming a chemically reactive mixture. [0002] In particular, the gasket element according to the invention has a mesh geometry of the mesh type and is intended to be applied to valve elements for mixing and recirculating polymer components, also known as A spool valve that is slidably movable in the mixing chamber of the head. Background technique [0003] High-pressure mixing devices are known for polymer components suitable to form a chemical mixture of reactive resins for injection or distribution in moulds. [0004] Mixing devices are known eg from US4332335 and EP1927448. [0005] The mixing device, more precisely a high-pressure mixing head, comprises a mixi...

AI Technical Summary

Problems solved by technology

[0080] This technique is labor-intensive due to the need to ensure a perfect seal of the mold and to avoid the entrapment of air bubbles; moreover, it requires the use of a double-shell mold, which is specially designed for the exact dimensions of the slide valve and is resistant to high pressures, which results in high manufacturing cost

[0081] In view of the above description, there is therefore considerable room for improvement in the preparation of sealing elements for sliding units in mixing plants, in particular slide valves for mixing heads of reactive components

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