Device for stretching web formed of thermoplastic synthetic resin

Abstract

The invention provides a device for stretching a web formed of thermoplastic synthetic resin ove r its entire width. The device (2) for stretching a web (1) formed of thermo plastic synthetic resin comprises a plurality of first stretching members (L) arranged in the peripheral direction on the peripheral surface of a drum (6) rotating in a machine direction (M). A rotation element (7) rotating in t he same direction of and in synchronization with the drum (6) is provided on the rotation shaft (8) of the drum (6). A plurality of second stretching me mbers (U) respectively corresponding to thefirst stretching members (L) are provided on the rotation element (7). Portions, facing in the radial direct ion of the drum (6), of respectively corresponding first stretching member (L) and second stretching member (U) are formed by protrusions (31, 41) and r ecesses (32, 42) extending in parallel to the shaft (8) and alternately arra nged in the peripheral direction of the drum (6) to form a complementary sha pe meshing detachably in the radial direction of the drum (6). At least one of the first stretching member (L) and the second stretching member (U) is f ormed to be movable in the radial direction of the drum (6).

Description

Technical field [0001] The present invention relates to a device suitable for stretching a sheet such as a fiber aggregate formed of a thermoplastic synthetic resin and a film formed of a thermoplastic synthetic resin. Background technique [0002] At present, methods and devices for making a sheet of fibers or films formed of thermoplastic synthetic resin travel in the machine direction and stretch the sheet in the machine direction during the travel are well known. [0003] For example, Japanese Patent Publication No. 60-26859 (Patent Document 1) discloses an apparatus for stretching a continuum of a nonwoven fabric that is a sheet formed of a thermoplastic synthetic resin. This device uses a first engaging roller pair having a groove parallel to the axis of the roller and a second engaging roller pair having a groove perpendicular to the axis, and stretches the nonwoven fabric in the machine direction and the direction crossing this direction. The circumferential surface of eac...

AI Technical Summary

Problems solved by technology

However, in this device, since the side portion of the sheet is bent toward the end surface of the central plate, and the sheet is elongated at the end surface, it is difficult to elongate the portion near the center in the width direction of the sheet at the same elongation rate. part and near the edge

That is, it is difficult to stretch the sheet with the same elongation across the entire width

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