Airlaid fiber device

Abstract

The invention discloses an airflow fiber covering device, which includes a coaxial transition zone, a cloth expansion zone, a coating fiber zone and a diversion contraction zone; gas enters from the gas inlet end of the transition zone, and passes through the fabric diffuser in sequence. flow area, the covering fiber area and the diversion contraction area, and discharge from the gas outlet end of the diversion contraction area; the interior of the transition area is provided with a cloth orifice coaxial with the transition area, and the cloth expansion The flow area is provided with an air guide orifice coaxial with the cloth expansion area, and the gas outlet end of the diversion contraction area is provided with an exhaust orifice coaxial with the diversion contraction area, and a There are sample clamps. The fiber laying device combined with the cylinder and the round platform can avoid the airflow dead angle at the wall joint where the airflow velocity is low or even the airflow cannot reach, will not cause a large amount of fiber deposition, and increase the fiber laying ratio. The opening position and opening ratio of the orifice plate are designed to make the radial air flow distribution more uniform, thereby improving the uniformity of fiber distribution.

Description

technical field [0001] The invention relates to the technical field of casting investment devices. Specifically, it is an air-laid fiber device. Background technique [0002] The applicant has used single fibers and hybrid fibers as reinforcing media, and by blending them into coatings and adding silica sol shells, the normal temperature strength of the shells has been improved to varying degrees, and its comprehensive performance has been improved (CN108213344A). However, a bottleneck problem has been encountered in the process of preparing the shell. When fibers with a large aspect ratio are blended into the coating and added to the shell, as the fiber blending ratio increases, the viscosity of the coating increases, the suspending property decreases, and the coating performance deteriorates. , the fibers will agglomerate or agglomerate, which will eventually lead to a decrease in the strength of the shell. use as figure 1 In the initial laying of the fiber device shown...

AI Technical Summary

Problems solved by technology

However, a bottleneck problem has been encountered in the process of preparing the shell. When fibers with a large aspect ratio are blended into the coating and added to the shell, as the fiber blending ratio increases, the viscosity of the coating increases, the suspending property decreases, and the coating performance deteriorates. , the fibers will agglomerate or agglomerate, which will eventually lead to a decrease in the strength of the shell

use as figure 1 In the initial laying of the fiber device shown, as the laying time prolongs, a small amount of fibers will fall on the wall of the four-sided platform at the lower part of the device. Periodic movement, when the laying time exceeds 20s, affected by the wall effect, the fibers near the wall will move parallel to the wall and gather at the junction between the four-sided platform wall and the four-sided living wall, even if the airflow pressure is increased , the fibers remain still and do not move in suspension, and the airflow velocity at the junction of the walls is low or even the airflow cannot reach it, resulting in a dead angle of airflow, resulting in the deposition of a large number of fibers, resulting in a low proportion of fibers covering the surface of the shell

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