Long-distance conveying device between longitudinal stretching machine and transverse stretching machine for biaxial stretching

Abstract

The invention relates to a two-way stretching long-distance conveying device between a longitudinal tensile machine and a transverse tensile machine. Two S guide rollers for conveying are arranged between the longitudinal tensile machine and the transverse tensile machine at a long distance; the two S guide rollers are two symmetric groups of S guide rollers respectively arranged on the longitudinal tensile machine side and the transverse tensile machine side; the S guide rollers comprise upper guide rollers and lower guide rollers; the upper guide rollers are higher than the lower guide rollers at the spatial position, and the upper guide rollers are closed to the longitudinal tensile machine or the transverse tensile machine; and the long distance means that a distance between the longitudinal tensile machine and the transverse tensile machine is greater than 3 m. By the installation of the two S guide rollers between the longitudinal tensile machine and the transverse tensile machine, the two-way stretching long-distance conveying device can control a sheet to enter the two S guide rollers and enable the sheet to be in a relatively steady state in the two S guide rollers. Compared with a sheet which is not improved, the sheet in the state has the advantage that the MDO outlet tension is very steady, and the up-and-down shaking, the fluctuation of the included side quantity and inclined pulling of the sheet are all improved substantially.

Description

technical field [0001] The invention belongs to the field of biaxial stretching of films, and relates to a long-distance conveying device between a vertical stretching machine and a horizontal stretching machine used for bidirectional stretching of polyester films. Background technique [0002] The principle of biaxially stretched polyester film: After the polyester melt is heated and extruded by an extruder to melt into a cast sheet, it is stretched longitudinally in an appropriate temperature range above the glass transition temperature and below the melting point (in a high elastic state). Machine (MDO) and transverse drawing machine (TDO), under the action of external force, successively carry out a certain multiple of stretching along the longitudinal and transverse directions, so that the molecular chain or crystal plane of the polyester melt is parallel to the film plane. Oriented and arranged in an orderly manner, and then heat-set in a tensioned state to stabilize t...

AI Technical Summary

Problems solved by technology

This treatment method must be found in a short time and dealt with in time, otherwise it will have an uncontrollable impact on the thickness of the product

When the amount of clamping edge is unstable, the vibration of the edge is too large, and it is easy to break the clamp and break the film. If the clamp is unclamped for a long time, there will be a large amount of waste film and the danger of firing pins inside the TDO, which will affect the normal production.

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