Foam pre-foaming machine

Abstract

The invention relates to a foam pre-foaming machine. The foam pre-foaming machine comprises an exhaust pipe, a vacuumizing pipe and a feeding port formed on a vacuum barrel body; the vacuumizing pipe communicates with a vacuumizing machine; a lower end barrel opening of the vacuum barrel body is provided with an end cover which is internally provided with a steam cavity chamber; the steam cavity chamber communicates with a steam source; a steam partition plate is arranged above the steam cavity chamber; a plurality of communicating holes communicating the steam cavity chamber with the vacuum barrel body are formed in the plate face of the steam partition plate; the steam partition plate is connected with a driving mechanism which drives the steam partition plate to rotate; the vacuum barrel body comprises an inner barrel and an outer barrel; a heat-preserving cavity chamber and a steam heating cavity chamber are arranged between the inner barrel and the outer barrel; the steam heating cavity chamber communicates with the steam cavity chamber through a pipeline; further heating and heat preservation on the vacuum barrel body are achieved, and the foam expanding effect is further improved; after expanding is completed, exhausting is performed on the vacuum barrel body; and then the vacuumizing operation is performed on the vacuum barrel body through a vacuumizing device, and therefore the drying degree of expanding bead particles in the vacuum barrel body is guaranteed.

Description

Technical field [0001] The invention relates to the technical field of foam processing, in particular to a foam pre-expander. Background technique [0002] In the foam production process, the original expandable resin beads must first be pre-expanded to obtain the required specific gravity. After pre-expansion, the beads should retain as much foaming agent content as possible, so as to fully expand in the next foam molding process to obtain a smooth foam white mold; packaging foams mostly use steam continuous pre-expander, continuous pre-expander The productivity is high, but the proportion is difficult to control. The intermittent pre-expansion machine can control the proportion of thick bead pre-expansion accurately through the material level, which is suitable for pre-expansion use of foam beads for lost foam with high contrast weight requirements. Intermittent pre-expansion machines are divided into two categories: steam and vacuum. The steam pre-expansion machine is cubic ...

AI Technical Summary

Problems solved by technology

In the vertical pre-expansion machine, the material level rises during the pre-expansion process, and the cross-sectional area of ​​the cylinder remains unchanged. It is easy to use the high material level to control the pre-expansion specific gravity, but the steam pre-expansion machine also needs a further air-drying device for air-drying foam beads. For example, boiling drying bed; horizontal pre-expansion machine, the cross-sectional area of ​​the cylinder is constantly changing when the material level rises, and it is difficult to accurately control the material level. The foaming agent inside the beads is promoted by the internal and external pressure difference Bead expansion, although the vacuum pre-expansion machine can get dry beads, but the heating efficiency is low, the pre-expansion speed is slow, and the insulation effect of the cylinder of the vacuum pre-expansion machine is not good, resulting in poor expansion of the beads

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