A uniform heating device for a biaxially stretched film horizontal stretching machine

Abstract

The invention discloses a uniform heating device for a biaxially stretched film cross drawing machine. The device comprises two static pressure boxes arranged in parallel in the vertical direction andorthogonally and four hot-air blowers, wherein the two static pressure boxes are the upper static pressure box and the lower static pressure box, and the two static pressure boxes are hollow and discoid boxes with same shapes and same structures; two sides of each static pressure box in the radial direction are each provided with an air intake channel, and the two air intake channels at two sidesare parallel to each other; the space between the upper working surface of the upper static pressure box and the lower working surface of the lower static pressure box is of a heating area; upper airoutlet holes and lower air outlet holes are correspondingly arranged on the upper working surface and the lower working surface; the upper air outlet holes and the lower air outlet holes are arrangedalternately; and the four hot-air blowers are correspondingly arranged at air inlets of the upper static pressure box and the lower static pressure box. The hot air in the upper static pressure box and in the lower static pressure box reach pressure balance in working; the upper air outlet holes and the lower air outlet holes are arranged alternately, so that the direct face of the discharged gasis avoided. Uniform heating temperature in a working area is ensured by the three key designs.

Description

technical field [0001] The invention relates to a biaxially stretched film production equipment, in particular to a biaxially stretched film transverse stretching machine. Background technique [0002] In the production process of biaxially stretched film, transverse stretching often faces problems such as uneven temperature and cumbersome heating equipment. The heating device of the traditional biaxial stretching film horizontal stretching machine adopts a single-inlet rectangular static pressure box. When the hot air blows into the plenum, the wind speed at the air inlet is relatively high, causing the back pressure to increase, making it difficult for the hot air to flow into the area to be heated from the air outlet, and the area to be heated cannot reach the expected temperature. When the hot air moves to the wall of the static pressure box, the wall reflects and the air pressure increases, and the hot air flows into the heating area through the air outlet at a faster ...

AI Technical Summary

Problems solved by technology

In addition, when the hot air flow hits the wall, it will cause air intake resistance, hinder the air intake of the static pressure box, and reduce the heating efficiency

In view of the uneven temperature distribution and low heating efficiency of traditional heating devices, we have made a series of improvements to the shape and structure of the plenum, the layout of the air inlet, and the direction of gas flow.

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