One-way stretching film compounded multiaspect drag-resisting avulsion-resisting film and method for producing the same

Abstract

The present invention provides a multidirectional tensile anti-tear composite film compounded with unidirectional stretched film, wherein at least two layers of unidirectional stretched film are firmly bonded and compounded into the multidirectional tensile composite film via two-component polyurethane binder; the unidirectional stretched film is the tube-shaped thin film which is stretched in unidirection in the temperature range over glassy state temperature and under viscous state temperature to produce macromolecule orientation; the columnar tubular film is oriented according to the axial direction showing the migration of 15 to 75 DEG C, spirally sectioned and stretched into the plane film with the macromolecule stretched orientation at the oblique angle of 15 to 75 DEG C to the film edge; at least two layers of the sectioned and flattened plane film are oppositely compounded with the stretched orientation direction in a mutually cross state to form the composite multidirectional tensile anti-tear film. The film is light in weight, high in strength, durable in service and significant in the anti-tear effect in longitude and latitude directions as well as the direction at 45 DEG C to the longitude and latitude directions. The present invention is simple in production method and equipment, and low in cost.

Description

Technical areas: [0001] The invention relates to a kind of multi-directional tensile and tear-resistant film composed of at least two layers of uniaxially stretched plastic film using an adhesive. It particularly relates to a cylindrical film with two layers overlapped and then longitudinally uniaxially stretched and then re-formed. The cylindrical tube film is skewed by 15° to 75° with the longitudinal stretching direction as the axis. The cylindrical film is cut into a flat film with a deflection angle of 15° to 75° between the stretching direction and the edge of the cut and flattened film. , a technology that makes at least two layers of stretch directions cross relative to each other and use an adhesive to combine them into a multi-directional tensile and tear-resistant film. Background technique: [0002] The technology closest to the present invention is the U.S. patent (Patent No. 3342657). The technology disclosed in this patent is that after the cylindrical film is...

AI Technical Summary

Problems solved by technology

During longitudinal stretching, the film is stretched longitudinally by two sets of inner and outer ring nip rollers. At this time, because the two sets of ring nip rollers cannot actually clamp the cylindrical film, it is difficult to produce longitudinal stretching. At this time, the film is actually longitudinally tensile. The strength does not increase, the actual tensile strength of the composite film is very low, and the excellent performance of the tensile strength in the stretching direction of the plastic film is increased by four to ten times after stretching and orientation, the tensile strength and tear resistance The performance improvement is not obvious

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