JP3954873B2 - Longitudinal stretching device for strips - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stretching apparatus for strips such as films and sheets, and more particularly to a longitudinal stretching apparatus for strips such as films and sheets that enables high-speed and high-magnification stretching.
[Prior art]
In a biaxial stretching apparatus such as a film or sheet, the sheet extruded from the T-shaped die is cooled and crystallized, and then the heated and softened sheet is stretched in the longitudinal direction. A film is drawn in the transverse direction. Recently, the production speed of films has increased, and facilities that enable stretching at a high speed (300 meters or more per minute) and high magnification (4.5 times or more) have appeared. In the handling of high-speed sheets and films as described above in the longitudinal stretching apparatus that stretches in the sheet feeding direction using the difference in roll peripheral speed, air is caught between the roll and the sheet, and there is a gap between the roll and the sheet. If it can be done, slipping may occur and the film surface may be damaged. In order to prevent the air from being caught between the roll and the sheet in this way, a nip roll is installed so as to hold the film on the drawing roll, and the arrangement of the drawing roll is improved to be caught between the roll and the sheet. By eliminating the air and optimizing the length of the film stretch zone (distance between the roll and the film contact) between the low-speed stretch roll and the high-speed stretch roll, slip between the roll and the sheet is prevented and the film surface is not damaged. I have to. However, the distance between the film contact points of the low-speed-side stretching roll and the high-speed-side stretching roll differs depending on the cross-sectional shape of the film raw material before stretching, the raw material, the friction between the roll and the film, etc. It is necessary to adjust according to the state.
[0002]
A conventional example of the longitudinal stretching apparatus disclosed in Japanese Patent Application Laid-Open No. 8-118466 includes roll moving means for changing the gap between the low and high speed stretching rolls, and a film on the surface of each of the low and high speed stretching rolls of the nip roll. It is a longitudinal stretching apparatus such as a film having a pressing position changing means for changing the pressing position of the film, and the gap between the stretching rolls can be changed according to the physical properties, thickness, stretching speed, etc. of the film. Yes. In this conventional example, the roll moving means for changing the gap between the low and high speed stretching rolls is configured such that the low and high speed stretching rolls are installed in each of the divided frames and the interval between the two frames is changed. There is also a pressing position changing means for changing the pressing position of the film to the surface of each drawing roll of the nip roll, and the lever and actuator for applying a pressing force to the nip roll and the nip roll are integrated around the rotation axis of the drawing roll. It is arranged so that it can rotate.
[0003]
[Problems to be solved by the invention]
As described above, in a longitudinal stretching apparatus such as a film, in order to enable high speed and high magnification stretching, the distance between the low and high speed stretching rolls is changed and the air caught between the roll and the sheet is excluded. This prevents slippage between the roll and the sheet, and eliminates scratches and marks on the film surface. Conventional examples have also been proposed as a solution to this problem. However, the pressing position changing means for changing the pressing position of the film to the stretching roll of the nip roll of JP-A-8-118466 is configured to rotate around the axis of the stretching roll. The high-speed drawing roll has a heat medium for temperature adjustment, a low-speed, high-speed drive mechanism, and the like, and shares the same roll axis, so that the configuration becomes complicated and the cost is high.
The present invention is a simple and easy-to-use method for changing the gap between the low and high speed drawing rolls in a longitudinal drawing apparatus such as a film and keeping the nip roll position at an appropriate position for eliminating air caught between the roll and the sheet. An object is to provide a low-cost longitudinal stretching apparatus.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention uses a device having the characteristics described in the following items as a solution.
(1) In a longitudinal stretching device that stretches strips such as films and sheets in the feed direction of the strip due to the difference in the peripheral speed of the low-speed and high-speed stretching rolls, it is driven at low speed by being pivotally supported by fixing members such as frames on both sides. A low-speed stretching roll with a fixed position, a low-speed nip roll that presses the strip wound around the stretching roll toward the stretching roll at the start position, and a circumference that is twice the stretching rate than the peripheral speed of the low-speed stretching roll. A high-speed stretching roll having a variable distance from a low-speed stretching roll driven at a speed; a high-speed nip roll that presses a belt-like material wound around the high-speed stretching roll toward the high-speed stretching roll at a position where winding starts; High-speed stretching roll position that can be attached to a fixed member such as a frame to change the distance from the low-speed stretching roll by moving the high-speed stretching roll and fix the changed position The high-speed stretching roll position adjusting means is rotatably supported by fixed members such as frames on both sides, and is fast-stretched with an axis parallel to the rotational axis at a position spaced from the rotational axis. A pair of rotary levers that rotatably support the roll, a single or a pair of linear drive actuators that are coupled to the rotary lever and rotationally move the high-speed stretching roll, and rotation of the rotary lever by the linear drive actuator attached to an external fixing member One or a pair of rotary lever positioning means for stopping the movement and adjusting and fixing the position of the rotary lever .
[0005]
(2 ) In the longitudinal stretching apparatus according to ( 1 ), the rotating lever positioning means includes a positioning mechanism main body attached to an external fixing member, a nut having a helical gear provided on the outer periphery built in the main body, A worm with a handle for turning a nut and a projecting rod in which a screw to be screwed into the nut is installed and whose rotation direction is constrained, the worm is rotated by the handle, and the nut is rotated to rotate the projecting The position of the rotating lever is adjusted by adjusting the protruding distance of the bar so that the tip of the protruding bar comes into contact with the side surface of the rotating lever that pivotally supports the high-speed stretching roll and receives the driving force of the linear drive actuator that rotates the rotating lever. A device for longitudinally stretching a belt-shaped material that is adjusted and fixed.
[0006]
( 3 ) In the longitudinal stretching apparatus according to the above (1) or (2) , winding of a belt-like object in which the high-speed nip roll is wound around the high-speed stretching roll in accordance with the adjustment movement of the high-speed stretching roll by the rotary lever positioning means described above. A belt-like longitudinal stretching device provided with high-speed nip roll position adjusting means capable of adjusting the position of the high-speed nip roll so as to hold the position at which the hook is started.
( 4 ) In the longitudinal stretching apparatus of ( 3 ), the high speed side nip roll position adjusting means includes a pair of nip roll position adjusting mechanism main bodies symmetrically fixed to fixing members such as frames on both sides, and the adjusting mechanism main body. A bearing guide provided substantially parallel to the moving direction of the high-speed drawing roll, a nip roll lever rotating shaft bearing that can be moved by being guided by the bearing guide, and a helical gear provided on the outer periphery of the nip roll position adjusting mechanism main body. And a worm with a handle for rotating the nut, and an adjustment screw shaft provided with a screw screwed to the nut and fixed to the bearing for the rotary shaft of the nip roll lever. Turn the nut to adjust the position of the nip roll lever rotating shaft bearing fixed to the adjusting screw. Longitudinal stretching device.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the space | interval adjustment apparatus of a extending | stretching roll is demonstrated based on a figure among the structures of the longitudinal stretch apparatus of this invention.
FIG. 1 is a side view showing the arrangement of the drawing rollers of the film longitudinal drawing apparatus, and FIG. 2 is a side view showing a changed state of the arrangement of the drawing rollers in FIG.
In the figure, the unstretched film 1 is wound around a low-speed stretching roll 3 driven at the same peripheral speed as the low-speed feeding drive roll 2 through a low-speed feeding drive roll 2, and then the peripheral speed of the low-speed stretching roll 3. It is wound around a high-speed stretching roll 4 driven at a circumferential speed that is twice the stretching ratio, and is stretched between the low-speed stretching roll 3 and the high-speed stretching roll 4 due to the difference in circumferential speed between these two rolls. The stretched film 1 ′ is wound around a high-speed feed roll 5 that is driven at the same peripheral speed as that of the high-speed stretch roll 4, and sent to a subsequent processing step.
[0008]
The low-speed side nip roll 6 presses the film 1 wound around the low-speed stretching roll 3 toward the stretching roll 3 at a position where winding is started, so that the low-speed stretching roll 3 reliably drives the film 1, Air is prevented from entering between the low-speed stretching roll 3 and the film 1. The low-speed nip roll 6 is rotatably supported at the end of a nip roll lever 8 rotatably supported by a shaft 9 fixed to a longitudinal stretching device frame (not shown), and is a hydraulic or pneumatic actuator that is a linear drive actuator. The cylinder / piston 15 generates a pressing force to the low-speed stretching roll 3 and is adjusted. The high-speed side nip roll 7 presses the stretched film 1 ′ wound around the high-speed stretching roll 4 toward the stretching roll 4 at the position where winding is started, so that the high-speed stretching roll 4 reliably drives the film 1 ′. In addition, air is prevented from entering between the high-speed stretching roll 4 and the film 1 ′. The high speed nip roll 7 is adjusted by generating a pressing force to the high speed stretching roll 4 by a hydraulic or pneumatic cylinder / piston 23.
[0009]
The high-speed stretching roll 4 is pivotally supported on both sides by a rotation lever 11, and the distance from the low-speed stretching roll 3 can be changed by rotating the rotation lever 11. The rotary lever 11 is fixed to the rotary shaft 12, and the rotary shaft 12 is rotatably supported with its position fixed to a longitudinal stretching device frame (not shown) on both sides. A linear drive actuator is attached to the end of the rotary lever 11. A certain hydraulic or pneumatic cylinder / piston 14 is pin-jointed to drive the rotary lever 11 to rotate. The position of the rotating lever 11 can be adjusted by rotating lever positioning means 24 attached to a longitudinal stretching device frame (not shown). If the combination of the rotary lever 11 and the rotary shaft 12 has a high rigidity structure, the rotary lever positioning means 24 and the cylinder / piston 14 are attached to only one rotary lever, and one set is sufficient. When a large force is applied to 4 and sufficient rigidity cannot be obtained in the combination of the rotary lever 11 and the rotary shaft 12 with respect to this force, two sets of the rotary lever positioning means 24 and the cylinder / piston 14 are installed symmetrically. There is a need to.
[0010]
The positioning means 24 of the rotary lever 11 includes a positioning mechanism main body 25 attached to a longitudinal stretching device frame (not shown), a nut 27 provided with a helical gear on the outer periphery built in the main body 25, and the nut 27. Rotating the handle of the worm 28 with a handle by positioning means comprising a worm 28 with a handle to be rotated and a protruding rod 26 screwed into the nut 27 and screwed over the entire length and restrained in the rotation direction, The nut 27 is rotated, the protruding distance of the protruding rod 26 is adjusted, the tip 26a of the protruding rod 26 abuts against the side surface of the rotating lever 11 that pivotally supports the high-speed stretching roll 4, and the rotating lever 11 is rotated. The position of the high-speed stretching roll 4 is adjusted and fixed by receiving the driving force of the hydraulic or pneumatic cylinder / piston 14.
FIG. 2 shows three movement positions when the rotary lever 11 is rotated. The rotary lever 11 rotates about the shaft 12, and the solid line indicates the position where the high-speed drawing roll 4 is farthest from the low-speed drawing roll 3, and the protruding rod 26 of the positioning means 24 protrudes the longest and the side surface 11 a of the rotary lever 11. Is pressed. A two-dot chain line indicates a position where the high-speed stretching roll 4 is closest to the low-speed stretching roll 3, and a dotted line indicates an intermediate position between the two.
[0011]
The contact point with the roll 4 wound around the high-speed stretching roll 4 and the stretched film 1 ′ starts to be wound changes depending on the movement of the high-speed stretching roll 4, but the contact side with the roll 4 must be pressed. The position of the nip roll 7 can be adjusted using the nip roll position adjusting means 30.
The position adjusting means 30 of the high-speed nip roll 7 is fixed to the frames on both sides (not shown) to adjust the position of the pair of nip rolls 7, and the moving direction of the high-speed stretching roll 4 to the adjustment mechanism main body 18. Bearing guides 18a and 18b provided substantially in parallel with each other, a nip roll lever rotating shaft bearing 19 which is movable by being guided by the bearing guides 18a and 18b, and a helical gear mounted on the outer periphery of the nip roll 7 in the position adjusting mechanism main body 18. A nut 21 provided with a gear, a worm 22 with a handle that rotates the nut 21, and an adjustment screw shaft 20 that is screwed into the nut 21 and fixed to the nip roll lever rotating shaft bearing 19. It is configured. The worm 22 is rotated by the handle of the worm 22 with handle, the nut 21 is rotated, and the position of the nip roll lever rotating shaft bearing 19 fixed to the adjusting screw shaft 20 is adjusted.
[0012]
When the high-speed drawing roll 4 is moved by the rotation of the rotating lever 11 and the distance from the low-speed drawing roll 3 is changed (for example, as in the high-speed drawing roll 4 shown by a two-dot chain line in FIG. 1), the high-speed drawing roll 4, the position at which the film 1 'after winding stretched around 4 is changed, and the position pressed by the high-speed nip roll 7 is shifted from the correct position. At this time, the position of the nip roll lever rotating shaft bearing 19 is changed. If the nip roll lever 16 is adjusted to the position indicated by the two-dot chain line by adjustment, the position pressed by the high-speed nip roll 7 occupies the correct position. As a result, the high-speed nip roll 7 is pressed toward the high-speed stretching roll 4 at the position where the film 1 ′ after being stretched wound around the high-speed stretching roll 4 is wound. In addition, air can be prevented from entering between the high-speed stretching roll 4 and the film 1 ′. The hydraulic or pneumatic cylinder / piston 23 can cope with a change in the position of the nip roll lever 16 if the stroke has a margin.
[0013]
【The invention's effect】
During high-speed, high-magnification stretching of strips such as sheets and films, air is trapped between the roll and the film, causing a gap between the roll and the film, resulting in slippage, and marks due to scratches or deposits on the film surface. There is a fear. In order to prevent air entrainment between the roll and the sheet, a nip roll is installed to hold the vicinity of the roll and sheet winding contact point, and the stretch zone length is the distance between the film contacts between the low-speed and high-speed stretch rolls. Also, the problem of slippage between the roll and the sheet and scratches on the film surface can be improved. The distance between the film contacts of the low-speed side and high-speed side drawing rolls varies depending on the cross-sectional shape of the original film before drawing, the raw material, and the friction between the roll and the film, etc. There is a need.
The present invention corresponds to such operating conditions, and in the longitudinal stretching apparatus for strips such as sheets and films, the gap between the low and high speed stretching rolls can be changed during operation. This is in accordance with the object of providing a simple and low-cost longitudinal stretching apparatus in which the nip roll position is maintained at the contact position.
[Brief description of the drawings]
FIG. 1 is a side view showing the arrangement of stretching rollers of a longitudinal stretching apparatus for strips such as films according to an embodiment of the present invention.
FIG. 2 is a side view showing a changed state of the arrangement of the drawing rollers in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Film before extending | stretching 1 'Film after extending | stretching 3 Low speed extending | stretching roll 4 High speed extending | stretching roll 6 Low speed side nip roll 7 High speed side nip roll 11 Rotating lever 14 Cylinder piston 16 Nip roll lever 17 Nip roll lever shaft 18 Nip roll position adjustment mechanism main bodies 18a and 18b Bearing guide 19 Nip roll lever shaft bearing 20 Adjustment screw shaft 21 Nut 22 Worm with handle 24 Rotating lever positioning means 25 Positioning mechanism body 26 Projecting rod 27 Nuts 28 Worm with handle 30 Nip roll position adjusting means

Claims (4)

In a longitudinal stretching device that stretches strips such as films and sheets in the feed direction of the strip due to the difference in the peripheral speed of the high-speed stretching roll, it is supported at a low speed by being pivotally supported by fixing members such as frames on both sides. Driven at a fixed low-speed stretching roll, a low-speed nip roll that presses the strip wound around the stretching roll toward the stretching roll at the beginning of winding, and a peripheral speed that is a multiple of the stretching rate than the peripheral speed of the low-speed stretching roll. A high-speed stretching roll having a variable distance from the low-speed stretching roll, a high-speed nip roll that presses the belt-like material wound around the high-speed stretching roll toward the high-speed stretching roll at a position where the winding starts, and a frame on both sides, etc. A high-speed stretching roll position adjustment hand that can be attached to a fixed member to change the distance from the low-speed stretching roll by moving the high-speed stretching roll and fix the changed position. With the door, the high-speed stretching roll position adjusting means is rotatably supported by the fixing member such as both sides of the frame, the position away from the rotational axis, the high speed stretching roll with an axis parallel with said rotary shaft A pair of rotary levers that are rotatably supported, a single or a pair of linear drive actuators that are coupled to the rotary levers to rotate and move the high-speed stretching roll, and rotational movement of the rotary levers by the linear drive actuators attached to an external fixing member. stop by longitudinal stretching device of the web which is characterized by comprising and a single or pair of rotating levers positioning means for adjusting the fixed position of the rotary lever. 2. The longitudinal stretching apparatus according to claim 1 , wherein the rotary lever positioning means includes a positioning mechanism main body attached to an external fixing member, a nut having a helical gear provided on the outer periphery built in the main body, and the nut. A worm with a handle to rotate, and a protruding rod in which a screw to be screwed to the nut is applied and the rotation direction is constrained, and by rotating the worm with the handle and rotating the nut, Adjusting the protruding distance, the tip of the protruding bar comes into contact with the side of the rotating lever that pivotally supports the high-speed stretching roll, and adjusts the position of the rotating lever by receiving the driving force of the linear drive actuator that rotates the rotating lever. An apparatus for longitudinally stretching a belt-like material characterized by being fixed. 3. The longitudinal stretching apparatus according to claim 1 , wherein the belt-like material is wound around the high-speed side nip roll wound around the high-speed stretching roll in accordance with the adjustment movement of the high-speed stretching roll by the rotary lever positioning unit. An apparatus for longitudinally stretching a belt-like material, characterized in that high-speed nip roll position adjusting means capable of adjusting the position of the high-speed nip roll is provided so as to hold down. 4. The longitudinal stretching apparatus according to claim 3 , wherein the high-speed nip roll position adjusting means includes a pair of nip roll position adjusting mechanism bodies fixed symmetrically to fixing members such as frames on both sides, and a high-speed stretching to the adjusting mechanism body. A bearing guide provided substantially parallel to the moving direction of the roll, a nip roll lever rotating shaft bearing that is movable while being guided by the bearing guide, and a helical gear provided on the outer periphery of the nip roll position adjusting mechanism main body. A nut, a worm with a handle for rotating the nut, and an adjustment screw shaft provided with a screw to be screwed to the nut and fixed to the bearing for the rotary shaft of the nip roll lever. The worm is rotated by the handle. The nut is rotated to adjust the position of the nip roll lever rotating shaft bearing fixed to the adjusting screw. Longitudinal stretching device of the web to be.

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