JPH069926U - Lateral stretching device - Google Patents

Abstract

(57) [Abstract] [Purpose] A horizontal stretch for stable stretching in the lateral direction by grasping the edges of the material to be stretched with clips securely so that slack and wrinkle-like folds and wrinkles do not occur. A stretching device is provided. [Structure] A pressing plate 5 is provided at a portion immediately before a side edge portion of a material to be stretched 4 is gripped by a clip 1 such that a contact surface 51 of the pressing plate 5 contacts a side edge portion surface of the material to be stretched 4. The contact surface of the pressing plate is provided with a ridge obliquely inclined so as to gradually expand outward in the width direction of the material to be drawn 4 in the traveling direction of the material 4 to be drawn.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transverse stretching apparatus capable of stably stretching in the transverse direction while preventing sagging, wrinkle-like folding or wrinkling of the material to be stretched in the width direction.

[0002]

[Prior art]

 Conventionally, the stretching of a thermoplastic resin film by a transverse stretching device is usually performed by gripping the thermoplastic resin film extruded by an extruder at the entrance of the transverse stretching device with clips on both sides of the film. A method is adopted in which the film is stretched in the direction and wound by a winder. In this case, as shown in FIG. 5, when the both side edges b of the film a are gripped by the clips c, a slack or jagged fold d or wrinkles are formed on the both side edges of the film a. There is a point.

In order to deal with this point, for example, Japanese Patent Application Laid-Open No. 60-120033 describes that a rotatable roller e is pressed against the film a surface as shown in FIG. In the publication, as shown in FIG. 7, it is described that the film a is pressed by a roll f whose inclination in the rolling direction can be adjusted with respect to the traveling direction of the film a.

[0004]

[Problems to be solved by the device]

 However, in the former case, it is necessary to change the arrangement of the roll e in various ways according to the state of the film a, and in the latter case, the rolling direction angle of the roll f is changed according to the state of the film a. It is necessary to make a slight change with respect to the traveling direction of the film a, and both of them have a problem that adjustment is difficult.

The present invention solves the above-mentioned problems of the prior art, and securely grips the side edges of the stretched material with a clip so as not to cause slack, wrinkle-like folds or wrinkles. The present invention has been made for the purpose of providing a transverse stretching device capable of stably stretching in the transverse direction.

[0006]

[Means for Solving the Problems]

 The present invention relates to a lateral stretching device that grips both side edges of a stretched material continuously supplied with clips and stretches in the width direction, in a portion just before the clip grips the side edges of the stretched material. A pressing plate is provided so as to contact the side edge surface of the material to be stretched, and the contact surface of the pressing plate with the side edge surface of the material to be drawn has a width that increases in the direction of travel of the material to be drawn. It is a transverse stretching device that is provided with a ridge that obliquely extends outward in the direction.

In the present invention, a pressing plate is provided at a portion of the side edge portion of the stretched material immediately before being gripped by the clip so as to contact the side edge portion surface of the stretched material. In addition, the contact surface of the pressing plate with the side edge surface of the material to be drawn is provided with a slanting ridge that gradually expands outward in the width direction as it goes in the traveling direction of the material to be drawn. There is.

The slanting angle of the slanting ridges with respect to the traveling direction of the stretched material needs to be 1 to 30 °. If it is less than 1 °, there is no effect of pulling the side edges of the material to be stretched outward, and if it exceeds 30 °, the resistance of the ridges causes the material to move in the direction of travel. Will hinder the progress of.

The height of the protrusions is preferably 0.3 to 3.0 mm, more preferably 0.5 to 1.0 mm. If the height is less than 0.3 mm, the material to be stretched is not caught, and the effect of pulling the side edge of the material to be stretched outward tends to be small. Conversely, if the height exceeds 3.0 mm. However, the resistance of the ridges tends to hinder the progress of the stretched material in the traveling direction. The angle of the tip of the protrusion is preferably 1 to 30 °, more preferably 1 to 10 °.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing a main part of a lateral stretching device according to an example of the present invention together with a material to be stretched, and FIG. 2 is a side view of the material to be stretched using the lateral stretching device according to an example of the present invention. FIG. 3 is a front view showing an example of a state in which the clip lever is gripped, and FIG. 3 is a front view showing in detail an enlarged part of FIG.

As shown in FIG. 1, the clip 1 extends from the inlet to the outlet of the drawing furnace along the both side edges of the material to be drawn 4 in the traveling direction of the material to be drawn 4 (indicated by the arrow in FIG. 1). There are two rows in a row. It is designed to pass from the exit of the drawing furnace to the outside and return to the entrance endlessly. Although not shown, an extruder is provided on the inlet side of the drawing furnace and a winder is provided on the outlet side.

As shown in FIG. 2, the clip 1 is provided on the clip base 3, and the clip base 3 contacts the rail 2. The clip 1 includes a clip lever 11, a clip body 12, and a grip plate 13.

A grip plate 13 is provided from the lower end of the clip body 12 toward the inside of the stretched material 4 in the width direction. The clip body 12 is bent inward in the width direction of the material 4 to be stretched in a V shape in the middle, and a substantially central portion of the clip lever 11 is stretched via a link 14 at the tip thereof. The clip 4 is rotatably connected in the width direction of the material 4, and the clip lever 11 is rotated to grip both side edges of the material 4 to be stretched between the lower grip surface 111 and the upper surface of the grip plate 13. The gripping position and the open position shown by the dotted line in FIG. 2 can be selectively set.

Reference numeral 5 denotes a pressing plate, which is a portion A (FIG. 1) immediately before the clip lever 11 rotates from the open position to the gripping position to grip the side edge of the stretched material 4 with the gripping plate 13. 3), a pressing plate 5 is provided so as to contact the side edge surface of the stretched material 4, as shown in FIG. The pressing plate 5 is fixed to the frame 7 via the supporting rod 6, and the angle and height of the stretched material 4 with respect to the side edge surface can be adjusted by the angle adjusting portion 61 and the height adjusting portion 62. .

As shown in FIG. 4, the pressing plate 5 has a rectangular shape whose entire shape is long in the traveling direction of the stretched material 4, and the stretched material 4 is provided on the contact surface with the side edge surface of the stretched material 4. A plurality of protrusions 51 are provided so as to be inclined so as to gradually expand in the width direction of the stretched material 4 in the traveling direction. The skew angle θ formed by the ridge 51 and the traveling direction of the stretched material 4 is 1 to 30 °.

Then, between the clip lever 11 and the grip plate 13, the contact surface of the pressing plate 5 is made into a material to be stretched at a portion A (see FIG. 1) immediately before gripping the side edge portion of the material to be stretched 4. By making contact with the side edge surfaces of the stretched material 4, the slack generated in the central portion of the stretched material 4 is reduced in the width direction as it goes in the traveling direction of the stretched material 4 provided on the contact surface of the pressing plate 5. The material to be stretched is moved outward along the slanting ridges so that it gradually expands outward, and the material to be stretched is gripped with clips so that it does not cause slack or wrinkle-like folds or wrinkles. It can be stably stretched in the direction.

[0017]

[Action]

 The present invention relates to a lateral stretching device that grips both side edges of a stretched material continuously supplied with clips and stretches in the width direction, in a portion just before the clip grips the side edges of the stretched material. A pressing plate is provided so as to contact the side edge surface of the material to be stretched, and the contact surface of the pressing plate with the side edge surface of the material to be drawn has a width that increases in the direction of travel of the material to be drawn. By providing a ridge that obliquely expands outward in the direction, slack and the like generated in the central portion of the stretched material is made to follow the ridge on the contact surface of the pressing plate, and Move it outward in the width direction so that the material to be stretched does not slacken or wrinkle and does not wrinkle, and the clip grips securely without slipping or slipping, which stabilizes laterally. Can be stretched.

[0018]

【Example】

Example 1 Using the transverse stretching apparatus shown in FIGS. 1 to 4, polyethylene terephthalate (manufactured by Eastman Kodak Chemical Co., Ltd .: trade name “PET-G”) was used as the material 4 to be stretched, with a film thickness of 120 μm and a width. Using a 200 mm film, the pressing plate 5 is made of iron (S45C) and has a hard chrome plating on its surface. The contact surface with the side edge of the stretched material has a height of 1 mm and a tip angle of 5 mm. Of the material to be stretched and having an angle of 10 ° with respect to the traveling direction of the material to be stretched, the film before transverse stretching was given a slack amount of 5 mm (maximum height-minimum height) and stretched. The temperature was 80 ° C., the moving speed was 2 m 2 / min, and the film was stretched 3 times in the transverse direction, and the presence of slip and the presence of slack were observed 5 minutes after the start of stretching. In addition, the variation ratio of the thickness of the stretched film at intervals of 10 mm was measured. As a result, there was no slip and the slack was eliminated. The variation in the thickness of the stretched film with respect to the average film thickness was 0.5%, and the dislocation of the stretched film from the clip was 0 out of 500 locations.

Comparative Example 1 The presence or absence of slip and the presence or absence of slack were observed in the same manner as in Example 1 except that the pressing plate 5 was not used, and the variation ratio of the thickness of the stretched film at 10 mm intervals was measured. . As a result, slippage occurred and the slack could not be eliminated. The variation in the thickness of the stretched film with respect to the average film thickness was 5.5%, and the film detachment with the clip occurred 3 times out of 500 places.

[0020]

[Effect of device]

 Since the present invention is configured as described above, the material to be stretched can be securely gripped by the clip without sagging or wrinkle-like folding or wrinkling, and without causing slipping or slipping. , And can be stably stretched in the transverse direction.

[0021]

[Brief description of drawings]

FIG. 1 is a plan view schematically showing a main part of a lateral stretching apparatus of an example of the present invention together with a material to be stretched.

FIG. 2 is a front view showing a state in which both lateral edges of a material to be stretched are gripped by clips using a lateral stretching apparatus according to an example of the present invention.

FIG. 3 is a plan view showing in detail a main part of FIG.

4A and 4B show a pressing plate used in a lateral stretching apparatus according to an example of the present invention. FIG. 4A is a bottom view and FIG. 4B is FIG. 4A.
3 is a cross-sectional view taken along line bb of FIG.

FIG. 5 is a front view showing a state in which a zigzag folding is generated when a conventional device is used.

FIG. 6 is a front view showing a case where a conventional device is used.

FIG. 7 is a front view showing a case where a conventional device is used.

[Explanation of symbols]

 1 clip 2 rail 3 clip stand 4 stretched material 5 pressing plate 51 ridge

Claims (1)

[Scope of utility model registration request] 1. A transverse stretching apparatus for gripping both side edges of a material to be stretched continuously by clips and stretching in the width direction, a portion just before the clip grips a side edge of the material to be stretched. In, the pressing plate is provided so as to contact the side edge surface of the stretched material, the contact surface of the pressing plate with the side edge surface of the stretched material, the width direction toward the traveling direction of the stretched material. A lateral stretching device, which is provided with a ridge that obliquely extends so as to gradually expand on the outside.