JPH0138742B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dispersing uneven thickness of a tubular synthetic resin film and a winding device, and particularly to a method for dispersing uneven thickness and winding of a tubular synthetic resin film extruded by an inflation method. Related to equipment. In a tubular synthetic resin film extruded by the inflation method, unevenness in thickness occurs to some extent on the fabric surface in the longitudinal direction of the film due to the inflation device, so the uneven thickness is folded. Several winding devices have been developed to wind the film while periodically and uniformly distributing it in the width direction.

However, in some known winding devices (Japanese Patent Publication No. 48-3534), in addition to a pinch roll (or squeegee roll) that rotates 360 degrees together with a guide plate about the axis of the film on a tube, at least 4 It has two turning rods that rotate back and forth,
Not only does the device become huge and require a large installation space and height, but also the control mechanism for controlling the rotation of a large number of turning rods is likely to become out of order.

In addition, in the known device disclosed in Japanese Patent Publication No. 49-23313, the film is transferred between turning rods that are inclined at 45 degrees to each other. There is a risk that wrinkles or meandering may occur in the film. Another known winding device (Japanese Patent Publication No. 53-4548) uses a pinch roll that rotates back and forth 180 degrees together with a guide plate around the axis of the tubular film, and a turning rod that rotates back and forth. However, with this device, the pinch roll cannot be rotated 360 degrees, so the uneven thickness during winding is not necessarily uniform across the width direction of the folded film and across the two sides of the folded film. cannot be distributed to

The present invention has been made in view of the above points,
The purpose of this is to uniformly disperse the uneven thickness of the tubular synthetic resin film extruded by the inflation method in the width direction of the two sides of the folded film so that the film can be wound up. It is an object of the present invention to provide a winding device that occupies a relatively small space and height, can be stably operated for a long time, and has relatively little meandering.

Next, a preferred embodiment of the present invention will be explained based on the drawings. Reference numeral 1 designates a base, and on the base 1, a drive gear 2, an intermediate gear 2a, and a turntable rotation gear 3 are used to move a turntable 4 up to 360 degrees left and right with respect to the film in a horizontal plane about an axis 4a. A drive motor 5 for reciprocating rotation is provided. On the turntable 4, a tubular synthetic resin film 6 is extruded around an axis 4a by an inflation method, and the film 6 is held while uniformly dispersing uneven thickness in the width direction of two sides of the folded film. A guide plate 7 and a pinch roll 8 are fixed to flatten the plate. The guide plate 7 and the pinch roll 8 are integrally rotated reciprocally with respect to the film 6 about the axis 4a, so that the pinch roll 8 grips the film 6 at different diameter positions and flattens it as the film 6 is fed. Tubular film 6
The uneven thickness that occurs parallel to the axial direction of the film 10 is uniformly distributed in the width direction of the two sides of the flattened film 10 in the form of wavy lines. Incidentally, the rotation angle range of the table 4 may be determined based on the dispersion state of uneven thickness of the film 6, and can be set or adjusted to a desired angle of 360 degrees or less in each of the left and right directions.

The pinch roll 8 is a pinch roll drive motor 9
The film 10 is driven by the film 10 and fed out while being flattened. The flattened film 10 sent out from the pinch roll 8 is sent to a first turning rod 12 supported by a first back-up roller 11 provided as necessary, and is turned as a film 13 for first turning. It is sent out from the rod 12. A first turning rod 12 located above the pinch roll 8
While being reciprocated 360 degrees around the axis 4a in the same way as the turntable 4 to the pinch roll 8, the reducer 14, the first turning rod oscillating gear 15, and the base 1
It makes a reciprocating swing movement of 30 degrees left and right in a horizontal plane, a total of 60 degrees, through an internal gear 16 fixed to the shaft 15a. The direction in which the film 10 is delivered from the pinch roll 8 is always perpendicular to the axis 8a of the pinch roll 8. Therefore, there is no possibility that wrinkles or meandering will occur in the film 10. The angle formed by the direction in which the film 10 is introduced into the first turning rod 12 and the axis 12a of the first turning rod 12 is always equal to the angle formed by the axis 12a and the direction in which the film 13 is sent out from the first turning rod 12. . As a result, the films 10, 13 can always be introduced and delivered at the same position by the first deflection rod 12.

When the first turning rod 12 is supported by the back-up roller 11, the first turning rod 12 will not be damaged by the tension of the film and will not bend even if the diameter is relatively small. 12
It is possible to avoid misalignment of the feeding positions of the films 10 and 13 caused by changes in deflection angle due to stress fluctuations during rotation, and not only can meandering of the film 13 be avoided, but also the first turning rod 12 is formed to be relatively light. The drive control of the first turning rod 12 can be performed easily and reliably, and the bearing supporting the rotation of the first turning rod 12 can also be made smaller. The back-up roller 11 may be rotatable about its axis or may be a fixed plate, but of course is omitted if the first turning rod 12 may have a large diameter to accommodate the film tension. Drive gear 2 is on the other hand intermediate gear 1
The second turning rod rotation gear 21 and the second turning rod 22 fixed to the gear 21 are reciprocated 180 degrees in a horizontal plane about the axis 4a through the gears 7, 18, 19, and 20. Like the first turning rod 12, the second turning rod 22 is supported by a second back-up roller 23 if necessary, and directs the film 13 sent out from the first turning rod 12 above the first turning rod 12. At the same time, the film 13 is turned and sent out as a film 24. The direction in which the film 13 is introduced into the second turning rod 22 and the axis 22 of the second turning rod 22
The angle formed by the axis 22a and the direction in which the film 24 is delivered from the second turning rod 22 is always equal.

The second back-up roller 23 may be rotatable around its axis like the first back-up roller 11, or may be a fixed plate; It is omitted if a larger diameter is acceptable. The second turning rod rotation gear 21 is also connected to a third turning rod swinging gear 29 and a third turning rod connected to the gear 29 via a third turning rod swinging main gear 25, a reducer 26, and gears 27, 28. 30
and oscillating around the axis 29a of the gear 29 by 30 degrees left and right for a total of 60 degrees. Furthermore, the axis 2 of the gear 29
9a is fixed to the base 1. Third turning rod 30
Like the first turning rod 12 and the second turning rod 22, it is supported by a third back-up roller 31 if necessary, and the film 24 fed from the second turning rod 22 is Receive the film 24 in the upper position and turn the film 32
Send as. Third turning rod 30 of film 24
The angle between the introduction direction and the axis 30a of the third turning rod 30 is always the same, and the angle between the axis 30a and the direction of delivery from the third turning rod 30 to the film 32 is always equal. The third back-up roller 31 may be rotatable around its axis like the first back-up roller 11 and the second back-up roller 23, or may be a fixed plate, but the third turning rod 30 may be omitted if the diameter is large enough to accommodate the film tension. The film 32 has a guide roll 33,
34, a film tension detection roll 35, a heat treatment roll 36, a guide roll 37, a film centering roll 38, and guide rolls 39 and 40 before being sent to a winder (not shown). The axes of these rolls 33 to 40 are fixed to the base 1, respectively, and are arranged as desired. Incidentally, the film 32 is introduced in a direction perpendicular to the axis 33a of the guide roll 33 and is sent out. The film tension detection roll 35 detects and controls whether or not the film 6 is being fed with a desired tension depending on the type, thickness, width when flattened, feeding speed, etc. of the film 6. Known adjustment means (not shown) may be operated to adjust the tension of the film accordingly. In order to reduce the contact resistance between the film and the turning rod, the turning rods 12, 22, 30 are provided with a large number of air blowing holes, and compressed air is blown onto the film to blow air between the film and the turning rods 12, 22, 30. It is also possible to form layers. This may reduce not only the tension applied to the film, but also the meandering of the film. The heat treatment rolls 36 are arranged so as to perform a desired heat treatment on the film 32, and can relieve the internal stress generated in the film 32 during the flattening process of the film 6, remove distortion of the film 32, and make it possible for the film 6 to
When the tube is made up of layers or more, it is also possible to make a laminated film by thermocompression bonding. The film centering roll 38 can be operated by a known adjustment means (not shown) to correct the meandering even if the film 32 has a slight meandering, and the film 32 with the meandering corrected can be moved to the winder. Align to desired lateral position. Furthermore, due to the friction between the turning rods 12, 22, 30 and the film, the tension of the films 10, 13, 24 introduced into the turning rods 12, 22, 30, respectively, and from the turning rods 12, 22, 30, respectively. The tension of the films 13, 24, 32 to be sent out is slightly different, and a slight meandering occurs in the film being fed.
Meandering can be corrected by adjusting the respective positions of 2 and 30.

Incidentally, the gears and the like in the above description may be replaced with chain sprockets, timing pulleys, etc. The three turning rods 12, 22 of the tubular synthetic resin film winding device 41 of the present invention having the above configuration
30 and the operation of the pinch roll 8 will be explained in more detail based on FIGS. 2 to 4 a to i.
2 and 4 a to i are all turning rods 12, 2.
2, 30, represents the positional relationship when projected onto the horizontal plane of the pinch roll 8.

FIG. 2 shows the initial state of the turning rods 12, 22, 30 and the pinch roll 8, and points O, A, B,
C is each pinch roll 8, turning rod 12, 2
It represents the center position of the film in contact with 2 and 30. Point O coincides with the axis 4a. triangle
ABC forms an equilateral triangle, point O is the midpoint of side AC, and the line connecting point O and point B is perpendicular to side AC.

FIG. 3 shows the rotational states of the turning rods 12, 22, 30 and the pinch roll 8 in one cycle T, with time plotted on the horizontal axis and rotation angle plotted on the vertical axis. In addition, the solid lines 42, 43, 44, and 45 respectively indicate the rotational states of the pinch roll 8 and the turning rods 12, 22, and 30 about the point O, in other words, the axis 4a, and the broken lines 46, 47 indicate The swinging state of the turning rod 12 centered on point A and the swinging state of the turning rod 3 centered on point C, respectively.
0 is shown in the head shaking state. Turning stick 1 here
2, 22, and 30 are supported by back up rollers 11, 23, and 31, respectively, and turning rods 12,
If the diameters of the turning rods 12, 22, 30 are so small that they can be ignored, the points A, B, C will be substantially the same as the turning rods 12, 22, 30.
30 axes 12a, 22a, 30a. In addition, the turning rod 12 centered on point O,
The rotation angles of 22 and 30 are indicated by the angles that the tangents of the rotation loci of points A, B, and C make counterclockwise with respect to the line segment OB, and are the rotation angles centered on points A to C. is the axis 1 with respect to the tangential direction of the rotation locus of each point A, C
The angles 2a and 30a are shown counterclockwise. Lines 42, 43, 44, 4 in Figure 3
The ratio of the inclinations of 6 and 47, that is, the ratio of rotation angular velocity and swing angular velocity is 360:360:180:60:
60 In other words, it is given by 1:1:1/2:1/6:1/6.

In Fig. 4 a to i, time t=0 (initial state), T/
16, T/8, 3T/6, T/4, 5T/16, 3T/
8, 7T/16, and T/2, the positions of the pinch roll 8, turning rods 12, 22, and 30, and the state of the film during feeding are shown. In this embodiment the device 4
1 is operated with a cycle T = 0 to 20 minutes and the third turning rod 30
The meandering of the film 32 fed out from the film was suppressed to less than 60 mm (film width 350 mm to 600 mm).

In addition, in FIGS. 4a to 4i, the guide roll 33 is located at the upper part of the drawing (not shown).

Note that the turning rods 12, 22, and 30 do not necessarily need to be rotated about the axes 12a, 22a, and 30a during operation, but they may be made freely rotatable by a clutch or the like when the film is first placed between the turning rods. It is preferable to obtain As described above, according to the present invention, the guide plate and the pinch roll can be reciprocated 360 degrees, so that uneven thickness of the tubular synthetic resin film extruded by the inflation method can be removed by two folds of the folded film. The film can be wound evenly in the width direction of the surface, one of the turning rods can perform reciprocating rotation and swinging motion in the horizontal plane, and one can perform reciprocating rotation in the horizontal plane, Furthermore, since the other one is capable of swinging motion with a fixed axis, the three turning rods can prevent twisting of the flattened film without causing wrinkles or meandering in the film, resulting in miniaturization of the device. It is possible to improve reliability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a winding device according to a preferred embodiment of the present invention. FIG. 2 is an explanatory diagram of the initial state of the pinch roll and turning rod in FIG. 1. FIG. 3 is a graph showing the rotational state of the pinch roll and turning rod in FIG. 1. 4A to 4I are explanatory diagrams showing the rotational positions of the pinch roll and turning rod in FIG. 1. 4... Turntable, 6, 10, 13, 2
4, 32... Film, 7... Guide plate, 8... Pinch roll, 12, 22, 30... Turning rod, 1
1, 23, 31... Backup Plorer.

Claims (1)

[Claims] 1. A guide plate that accepts a tubular film and flattens the tubular film and guides it out; a pair of pinch rolls that are in contact with each other to pinch the film that has passed through the guide plate; A rotation means connected to a pair of pinch rolls to forcibly rotate the film about the axis of The turning rod, the guide plate, and the pinch roll are synchronously rotated 360° in a horizontal plane about the axis of the tubular film, and the The first turning rod, which is the most upstream of the three turning rods, is centered on the axis of the tubular film in a horizontal plane.
The reciprocating rotation of the first turning rod is performed by reciprocating the turning rod by 360° and in synchronization with the reciprocating rotation by 360°, by making a swinging movement in a horizontal plane at an angle of 30° about the first swinging angle position. A second turning rod disposed in the middle is reciprocated in a horizontal plane within a range of 180° about the axis of the tubular film, and in synchronization with the reciprocating rotation of the second turning rod. a drive device that swings a third turning rod on the most downstream side in a horizontal plane at an angle of 30° about another swing angle position fixed with respect to the axis of the tubular film; and a roll for receiving the film sent out from the three turning rods. The first turning rod spans the first turning rod when the line segment connecting each center point of the portion of each turning rod occupied by the film formed substantially forms an equilateral triangle. a position that intersects at an angle of 30° with the first swing angle position that coincides with a straight line that passes through the center point of the portion of the first turning rod occupied by the pinch roll axis and is parallel to the axis of the pinch roll; occupies
The second turning rod is located perpendicular to the axis of the pinch roll, and the third turning rod is a third turning rod occupied by a film spanning the third turning rod. occupies a position that passes through the center point of the portion and intersects at an angle of 30° with the other swing angle position that coincides with a straight line parallel to the axis of the pinch roll, and The period of the swinging motion of the rod is the same as the period of the 360° reciprocating rotation of the first turning rod, and the swinging direction of one of these first and third turning rods is the same as the swinging direction of the other. The opposite is a winding device for tubular synthetic resin film.