JPS63115722A - Simultaneous and biaxial stretching machine capable of converting stretching magnification in longitudinal direction - Google Patents

Abstract

PURPOSE:To simplify a change in stretching magnification by facilitating changeover of the gripping pitch of a stretching film, by providing a large number of pin holes for a multi-stage changeover on a chain link. CONSTITUTION:A plurality of pin holes I-IV are provided on the other end of chain links 8, 8' at predetermined intervals. When a pin 9 is inserted into the pin hole I of the chain links 8, 8', the pitch between the chain links 8, 8' after stretching of a film becomes twice as long as L (I). When the pin 9 is put into the pin hole II of the chain links 8, 8' in place of the pin hole I, the pitch between the chain links 8, 8' becomes twice as long as the L (II) similarly. The gripping pitch P(0) after the stretching of the film can be changed easily and stretching magnification in a longitudinal direction of the film can be changed simply and easily by putting the pin 9 into any of the pin holes I-IV in place of the other of them.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a simultaneous biaxial stretching machine for simultaneously stretching a sheet-like material, such as a thermoplastic flat film, in the longitudinal and transverse directions.

[Conventional technology]

In the conventional simultaneous biaxial stretching apparatus, as described in Japanese Patent Publication No. 44-7155, the link device that grips both sides of the film during film stretching is composed of equal-length strips connected in a folded shape. The longitudinal stretching is done by the guide groove. f
By regulating the movement of t, the intersecting angle of the uniform length strips is changed, that is, the gripping pitch of the film is changed. However, in this mechanism, the film gripping pitch before and after stretching is constant, so the stretching ratio in the longitudinal direction is always constant.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, since the stretching ratio in the longitudinal direction is always constant, the stretching conditions are also constant, and there is a problem that it is not possible to produce a wide variety of films using the same stretching machine.

An object of the present invention is to provide a link device in which stretching conditions can be freely selected using one stretching machine.

That is, the object is to provide a stretching device that can be used for multiple purposes.

[Means for solving problems]

The above object is achieved by creating a structure in which the film gripping pitch either before or after stretching the film is kept constant, and the remaining film gripping pitch can be changed freely.

The film gripping pitch before stretching is determined by the outer diameter of the stopper installed at the connecting part of the equal length links connected in a folded shape, and the film gripping pitch after stretching is determined by connecting the adjacent equal length links. Determined by Cesilylev's pitch.

Here, it is possible to change the gripping pitch of the film before stretching and the immediate stretching ratio in the longitudinal direction.

Similarly, if the pitch of y-enrisik is kept constant,
By changing the outer diameter of the stopper, the stretching ratio in the longitudinal direction can be changed.

[For production]

After stretching the film, the link device is in a fully open state, that is, the link device is fully extended, so
Film gripping pitch after film stretching is 100%
determined by the pitch of the pitch.

Since the stretching ratio in the longitudinal direction is the film gripping pitch after stretching divided by the gripping pitch before stretching, the stretching ratio will change if the pitch is reduced by changing the pitch of the Cesilylev.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to J. 1 is a film, 2 is a lithic plate of equal length 6.6'
Guide rails 10, 11, .
12. 13, and is driven endlessly by super dynamic sprockets 4, 4' and 5, 5'. 3 is a film gripping device attached to one end of the link device 2; i2 glue〉Stopper attached to hinge part of plate 6, 6', 8, 8'
is a checkerboard whose one end is pivotally attached to the shaft of the stopper 7, 7' and the other end is connected by a screw 9, which defines the film gripping pitch P(o) after stretching.

The film l advances in the direction of the arrow, and
The two film gripping bags WR3 hold both sides of the film and simultaneously stretch it in two directions, the vertical direction and the horizontal direction. From the film preheating section to the entrance of the film stretching section (
As shown in FIG. 2, the link device 2 in FIG.
Since the sprockets 4 and 4' are pressed against each other and driven, the stoppers 7 and 7' attached to the hinges of the screw plates 6 and 6' are in close contact with each other.
．． 7' are driven to the entrance of the film stretching section (section A) while being pressed against each other, so the film gripping pitch P(+) before stretching is determined by the outer diameter dimension C of the stopper 7.7'. Link device 2 after the film stretching section
is pulled by the outlet side sprockets 5, 5', and after the film is stretched (section B in Figure 1), as shown in Figure 3, the chain
Since the ribbons 8 and 8' are in a fully extended state, the film gripping pitch P(0) after stretching is determined by the pitch D of the cheese relief 8.8'.

In such a mechanism, the outer diameters of the stoppers 7 and 7' are kept constant, and the pitch D of the chains 8 and 8' is
In order to change the angle, as shown in Fig. 4, a plurality of pin holes ■~■ are made at a predetermined interval on the other ends of the chase reliefs 8 and 8' whose negative ends are pivotally connected to the shafts of the stoppers 7 and 7'. The setting is
By changing the insertion position d of the pin 9, the pitch D of the chase relief 8.8', that is, the film gripping pitch P (o) after film stretching can be changed.

To explain this in detail with reference to FIGS. 3 and 4, when the pin 9 is inserted into the pin hole I of 8.8' of the chain relieving pitch, the pitch D of the 8.8' of the chain relieving line after film stretching is L.
(G) is twice as large, and similarly, if the pitch hole ■ of the chase relief 8 and 8' is replaced with pin > 9, the pitch D will be L.
This is twice as much as (1). In this way, put a pin in hole 1~■
By replacing 9, the gripping pitch P(o) after film stretching can be easily changed, and the longitudinal stretching ratio of the film can be easily changed.

〔Effect of the invention〕

According to the present invention, the gripping pitch at the film inlet portion is kept constant, and only the film gripping pitch after the film is low-stretched can be easily changed.

That is, it is possible to provide a single stretching machine having various stretching ratios, and it is possible to provide a stretching machine that can be used for multiple purposes.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a simultaneous biaxial stretching machine capable of converting the stretching ratio in the longitudinal direction according to the present invention, Fig. 2 is a plan view of a resizing device before film stretching, and Fig. 3 is a link after film stretching. FIG. 4 is a plan view of the device according to the invention. DESCRIPTION OF SYMBOLS 1... Film, 2... Lifting device, 3... Gripping device, 4.4', 5.5'
...Drive sprocket, 6.6'...
・Riku plate, 7.7'...stopper, 8,8'...cheshire shift, 9...
・Pi〉、■～■・・・・・・Bish hole, 10～13...
...Guide rail, A...Film preheating section, B...
......After the film stretching part, C...Stopper outer diameter, D...Change shift pitch I^IV.
−・−♂shikuζ

Claims (1)

[Claims] 1. A film gripping device is provided at one end of an endless link device in which link plates of equal length are connected in a folded shape, guide rails for guiding this link device are provided on both sides of the film, and a plurality of sprockets are used to hold the link device. In a simultaneous biaxial stretching machine that simultaneously stretches a film in both longitudinal and lateral directions by driving the device, there is provided a chain link whose one end is pivoted to the hinge part of the link plate of the link device and whose other end is connected with a pin. A simultaneous biaxial stretching machine capable of changing the stretching ratio in the longitudinal direction, characterized by having a plurality of pin holes at the end.