초록 ▼

The present invention relates to a process and device RIM involving a mixing chamber (1) with opposing injectors (2, 3). The efficiency is maximized through the operation in flow regimes with very strong mixing dynamics, which is assured by means of the introduction of schemes to: detect the flow re

The present invention relates to a process and device RIM involving a mixing chamber (1) with opposing injectors (2, 3). The efficiency is maximized through the operation in flow regimes with very strong mixing dynamics, which is assured by means of the introduction of schemes to: detect the flow regime within the mixing chamber, through the dynamic pressure measurement upstream of the injectors (2, 3), using means (5); and/or impose a chaotic flow regime, through the pulsation of the opposed jets, using means (6). Alterations in design, comparatively to the traditional geometries, are also proposed, concerning: the mixing chamber (1), being foreseen a prismatic rectangular chamber; the injectors (2, 3), being foreseen elongated injectors; and even the scheme of injection of the materials, using a third injector (4).

대표청구항 ▼

The invention claimed is: 1. Production process for parts by Reaction Injection Moulding, characterized in that it is performed a dynamic pressure measurement, for the determination of a pulsation—both in frequency and in amplitude—to which a mixing and reaction pulsation regime is su

The invention claimed is: 1. Production process for parts by Reaction Injection Moulding, characterized in that it is performed a dynamic pressure measurement, for the determination of a pulsation—both in frequency and in amplitude—to which a mixing and reaction pulsation regime is subjected to, and subsequently is detected a flow regime within the mixing and reaction chamber, wherein the performing the dynamic pressure measurement includes measuring the frequency of a pressure signal obtained from the dynamic pressure measurement, such that the frequency is a function of mixing dynamics. 2. Process according to claim 1, characterized in that the dynamic pressure measure is made upstream of the injectors. 3. Process according to claim 2, characterized in that the dynamic pressure measure is made using a differential pressure transducer, with pressure taps located upstream of the injectors. 4. Process according to any of claims 1 to 3, characterized in that a pulsation is artificially introduced in the jets of the injectors and, in the jets it is performed a measurement of the pulsation resulting from the combination of the artificially introduced pulsation and the natural pulsation resulting directly from the mixing and reaction regime. 5. Process according to claim 4, characterized in that the artificially introduced pulsation is automatically adjusted, in frequency and/or in amplitude, as a function of the dynamic pressure measurement.