JPH0530736B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to the invention, in which when a film-like material such as a synthetic resin film is wound up to obtain a wound roll product, the material is drawn into the winding roll along with the film-like material to be wound. A method for winding a film-like material that can have a desired winding density of hard or flexible winding by actively controlling the flow of air, and a method suitable for use in carrying out the method. Regarding equipment.

(Prior art) Membrane-like materials such as plastic films include cellophane-like materials that are difficult to stretch but have high surface slip properties, such as biaxially stretched polypropylene film.
There are various physical properties such as polybutadiene film, which is very stretchable and has a rubber film-like surface with low slip resistance.

Various winding machines are provided for winding such plastic films around a core to obtain rolled products, and there are surface winding methods, center winding methods, and both surface and center winding methods. There are many known winding machines.

(Problem to be Solved by the Invention) Winding rolls must be made so that they do not slip during winding, but rolls that are wound more tightly than necessary may cause the film to change over time or become uneven in thickness. In many cases, the winding diameter varies locally in the circumferential direction, resulting in a wavy gauge band, or when the film is unfolded, the film is locally deformed, causing sag.

Therefore, it is important to wind the film with appropriate stiffness so as to prevent the film from slipping or buckling, thereby not damaging the original quality of the film.

Generally, an air film (air film) is attached to the surface of a film moving in space, and the density of this air film becomes high just before the winding contact line where the film contacts the winding roll.

Although not all of the air film is drawn into the winding roll, it becomes interposed between the film layers constituting the roll.

The larger the amount of air film intervening, the softer the winding roll will be, but the easier it will be for edges to shift or load to shift during winding.

In addition, for soft films, this air film is often unevenly distributed, causing air bubbles to form in the winding roll, resulting in wrinkles, and air marks appearing on the film when it is unfolded. There are problems that can lead to deterioration of quality.

On the other hand, when winding with high tension, high tension stress (force acting in the direction of tightening) is generated on the winding roll, so the amount of air film in the winding roll is reduced accordingly, but the tension is higher than necessary. is applied to the film, it is not appropriate to adjust the amount of retraction of the air film only by tension, and a touch roller is generally used for this purpose.

Conventionally, high-quality winding rolls have been obtained by appropriately selecting and combining the tension and the contact force of the touch roller according to the properties of the winding film, but strictly speaking, the winding rolls have to be perfectly round. However, it is difficult to control the tension and contact force at a constant level due to the phenomenon that the winding surface vibrates minutely. Not only does it require management, but it also has limitations and, depending on the type of film, it is necessary to accept a certain degree of quality deterioration.

Therefore, the inventors of the present invention have determined that the above-mentioned tension and contact pressure are
As a result of various studies and many experiments to see if there are any elements other than large control elements that can easily and reliably control the air film entrapment amount, we found that:
The present invention was completed by discovering that it is effective to directly control the amount of air entrained itself. We have now provided a way to directly control the
It is an object of the invention to improve productivity by realizing high-precision control using simple means and mass-producing high-quality rolled products at low cost.

(Means for Solving the Problem) In order to achieve the above object, the present invention has the following features:
In the winding method of the invention of claim 1, when the film-like material 3 is wound around the winding core 2 to obtain a wound roll product, the winding roll 4 that is being wound and the winding contact line A immediately before the winding are moved. The atmosphere in the wedge-shaped space formed between the film-like material 3 is communicated with the air machine 5, and the atmospheric pressure is set to a positive or negative pressure depending on the degree of surface slippage of the film-like material. The winding density is controlled by adjusting the flow of air that is drawn into the winding roll 4 along with the traveling film-like material by maintaining the pressure in a certain pressure range.

The invention of claim 2 as a device used to carry out this winding method includes a core support part 1 that rotatably supports the core 2, and a core 2 supported by the core support part 1.
A contact roller 6 is provided so as to be able to come into pressure contact with the surface of a winding roll 4 whose diameter is gradually increased by winding up the film-like material 3, and which guides the traveling film-like material 3 by adjusting the pressing force. It has an air bleed port 9 formed as an elongated port with a length equal to or longer than the width of the shaped object 3, and the air bleed port 9 is
The film-like material 3 is placed close to the winding contact line A at the contact position of the contact roller 6 and is connected to the winding roll 4 and the film-like material 3 that is attached to the outer periphery of the contact roller 6 and runs toward the winding contact line A immediately before being wound. A bleed air nozzle 8 is disposed in a wedge-shaped space formed between the bleed air nozzles 8 and 8, which are disposed facing each other parallel to the width direction of the winding contact line, and which are provided so as to be able to maintain a constant relative positional relationship with the contact roller 6. and a bleed air blower _5-1 connected to the
It is characterized in that winding is performed by reducing air drawn between the winding layers of the winding roll 4, and on the other hand,
The invention of claim 3 provides a core supporting portion 1 that rotatably supports a winding core 2, and a winding core 2 supported by the core supporting portion 1 that gradually increases the diameter by winding a film-like material 3. A proximity roller 7 whose position can be adjusted to maintain a constant minute distance from the surface of the winding roll 4 to be formed and which guides the traveling film-like material 3;
It has a jet nozzle 9' formed into an elongated mouth with a length greater than the width of the winding roll 4, and the jet nozzle 9' is brought close to the winding contact line A near the proximity roller 7, so that the winding roll 4 and the proximity roller 7 and the film-like material 3 immediately before winding, which runs toward the winding contact line A, and is disposed opposite to the winding contact line A in parallel with the width direction of the winding contact line A. Along with this, the proximity roller 7
It is equipped with a blow nozzle 8' which is provided so as to be able to maintain a constant relative positional relationship with the blow nozzle 8', and an air compressor _5-2 connected to the blow nozzle 8' to increase the amount of air drawn between the layers of the winding roll 4. It is characterized in that winding is performed by

(Function) The atmosphere at the position immediately before the entrainment of air along the entire width of the winding contact line A is bleeded by the bleed nozzle 8 so that a predetermined vacuum pressure is maintained by the bleed blower _5-1 , which is a type of the air machine 5. At the same time, by adjusting the contact force of the contact roller 6 against the surface of the winding roll 4, the amount of trapped air can be actively reduced.
A hard-wound rolled product with no winding deviation or air bubbles can be obtained, and it is suitable for transparent winding in which a transparent film with high surface slip property is wound so that it can be seen through to the core.

Further, the atmosphere is atomized by an air compressor _5-2 , which is a type of air machine 5, through a jet nozzle 8' so as to maintain a predetermined static pressure higher than atmospheric pressure, and at the same time, the winding roll 4 of the proximity roller 7 is By adjusting the minute distance to the surface, the amount of entrained air can be actively increased, and a flexible wound roll product without gauge bands can be obtained, making it suitable for winding films with low surface slip properties. It is suitable.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show a device according to claim 2, in which numeral 1 is a core support portion, and a cart 12 is capable of linearly reciprocating in the front-rear direction with the forward direction being the right direction in the drawing; It consists of a pair of support frames 13 erected from both left and right sides of the truck 12 and a shaft support device 14 attached to the upper end of the support frames 13, and the winding core 2 is fitted into the winding core 2 by the shaft support devices 14. The core 2 is supported horizontally and rotatably in the left-right direction orthogonal to the forward direction of the truck 12 by supporting the take-up shaft.

3 is a membranous material (hereinafter referred to as film),
The winding diameter is gradually increased by hanging the winding core 2 on the guide roller 11 and the contact roller 6 sequentially and winding it around the winding core 2 supported by the winding core support part 1, and rotating the winding core 2 in the direction of the arrow. A winding roll 4 is formed.

The contact roller 6 is rotatably mounted on the lower ends of a pair of swinging arms 15 whose upper ends are pivoted and suspended, and the contact roller 6 is maintained parallel to the winding core 2 at an equal horizontal level. At the same time, by operating the air cylinder 16 connected to the swing arm 15, the winding roll 4 is brought into pressure contact with the winding roll 4 while maintaining a required contact pressure.

However, in the winding device shown in FIG. 1, in order to prevent the contact pressure of the contact roller 6 from fluctuating due to the influence of gravity, the central axis is always vertically downward relative to the support point of the swinging arm 15. Although the details are not shown in the drawings, in order to constantly maintain the contact pressure at the vertically downward position, the carriage 12 is moved as the winding diameter of the winding roll 4 increases.
The servo drive mechanism is used to move the contact roller 6 backward to the left, and in this way, it is possible to maintain a constant tension on the film 3 and to maintain a constant pressing force on the contact roller 6. The winding contact line formed by contacting the winding roll 4 is indicated by A in the figure.

The winding device having the above configuration is attached with an air bleed nozzle 8 and an air bleed blower _5-1 of the air machine 5 which is a mechanical energy/air energy conversion mechanism, and the air bleed nozzle 8 is connected to a manifold 10 and piping. It is connected to the bleed port of the bleed nozzle 5-1 via the bleed air nozzle _5-1 .

As shown in FIGS. 2 and 5, the air bleed nozzle 8 is a housing having an elongated air bleed port 9 at its tip, the length being longer than the width of the film 3.
The cross-sectional shape perpendicular to the longitudinal direction has a slope table shape with an arcuate inclined surface, and the air bleed port 9 at the tip is oriented toward the winding contact line A, so that the winding roll 4 and the contact roller 6 are arranged vertically upward. Arrange and roll 4
Also, the air bleed port 9 can be brought as close as possible to the winding contact line A without contacting the contact roller 6.

In the winding device thus constructed, when the bleed blower _5-1 is operated to bleed air while winding, a wedge is formed between the running film 3 and the surface of the winding roll 4 immediately before the winding contact line A. The space becomes a negative pressure region by the air extraction operation of the air extraction nozzle 8, and thus the air drawn between the layers of the winding roll 4 can be reduced and winding can be performed.

Here, to give a specific example of a comparative experiment, the applied film is a biaxially oriented polypropylene film (OPP) with a thickness of 25 μm and a width of 550 mm, which has a large surface slibbability. 4
Kg/full width, contact roller 6 pressure 3.5Kg/full width,
The winding diameter is 300 mm and the winding speed is 200 m/min.
When the air bleed blower _5-1 was operated under the conditions of a static pressure of 300 mm Aq and an air flow rate of 0.8 m ³ /min using an air bleed nozzle 8 with an air bleed port 91 mm wide and 550 mm long to perform winding, the static inside the manifold 10 was The pressure was actually measured to be -260 mmAq, and even if the winding roll 4 was stood vertically, it did not roll off, and
There were no air bubbles present.

On the other hand, when a comparison winding operation was carried out with the bleed blower _5-1 stopped, no bleed air performed, and other winding operating conditions made the same, and the winding roll stood vertically, there was a slight difference between the film layers. Slippage occurred and the winding broke.

From the results of this experiment, it was determined that the amount of air drawn between the layers of the winding roll 4 could be reduced by the suction action of the air by the air extraction nozzle 8, and the effects of the present invention were fully confirmed.

Next, FIGS. 3 and 4 show an apparatus according to claim 3, in which the mechanism of the core support part 1 is the same as the example shown in FIG. It has a structure in which the roller 7 is fixed in position and rotatably supported.

The proximity roller 7 is kept parallel to the winding core 2 supported by the winding core support part 1 at an equal horizontal level, and is kept at a constant minute interval with respect to the circumferential surface of the winding roll 4. In the illustrated example, the position of the winding roll 4 is detected, the position is compared with the diameter of the winding roll 4, and the winding roll 4 is adjusted so that the distance between the winding roll 4 and the adjacent roller 7 is always constant. As the winding diameter increases, the carriage 12 is configured to be moved backward to the left by a servo mechanism.

This winding device is equipped with a jet nozzle 8' and an air compressor _5-2 , and the jet nozzle 8' is connected to the outlet of the air compressor _5-2 via a manifold 10 and piping.

As shown in FIG. 4, the jet nozzle 8' uses a nozzle with an elongated opening having the same structure as the extraction nozzle 8, and winds the jet nozzle 9' so as not to contact the winding roll 4 and the proximity roller 7. The configuration in which the contact wire A is arranged as close as possible to the contact line A is also the same as the example shown in FIG.

When the air compressor _5-2 is operated for compression while winding, the wedge-shaped space between the running film 3 and the surface of the winding roll 4 immediately before the winding contact line A becomes a positive pressure region. In this way, winding can be performed by increasing the amount of air drawn between the winding layers of the winding roll 4.

Next, to give a specific example of a comparative experiment, the applied film was a polypropylene film (CPP) with a thickness of 25 μm and a width of 550 mm, which had a low surface slip property, and the winding conditions were a winding tension of 5 kg/full width, and a Take diameter
300 mm and a winding speed of 200 m/min, and on the other hand, the static pressure in the manifold 10 was set to air pressure + 0.5 Kg/cm ² and the proximity roller 7 was operated as close as possible without touching. No gauge band appeared on the winding roll 4, resulting in a smooth winding state.

On the other hand, when a comparative experiment was carried out under the same winding operating conditions, with the operation of the air compressor _5-2 stopped and no fumes produced, gauge bands were generated at several locations.

From the above comparison results, it was determined that air could be actively entrained between the winding layers by the jet nozzle 8', and the effectiveness of the present invention was confirmed.

However, since excessive air suction can cause the film to unwind, it is of course necessary to set conditions to draw in the appropriate amount of air depending on the type of film.

Note that the winding machine according to the present invention is not limited to the embodiments, and includes various winding machines of a surface winding type, a center winding type, and a surface center winding type having contact rolls or adjacent rolls. It is.

(Effects of the Invention) As described in detail above, the present invention provides a film-like material that runs along the entire width of the winding contact line A on the winding roll 4 and toward the winding roll 4 during winding and the winding contact line A immediately before winding. By setting the atmosphere in the wedge-shaped space formed between the film and the film to a pressure range lower than the atmospheric pressure, the amount of air entrained can be actively reduced, thereby making it possible to wind the film with high surface slip properties. It is possible to reliably wind the material without any deformation or air bubbles.

In addition, by setting the atmosphere to a pressure range higher than atmospheric pressure, the amount of air entrained can be actively increased, and when winding a film with low surface slip property, a gauge band does not occur. product is obtained.

Since the present invention requires means for controlling the pressure of the atmosphere, the mechanism is simple and easy to handle, and it is more versatile than, for example, a method that delicately adjusts the contact pressure of a contact roller. The effect is that excellent and fine control can be reliably performed.

[Brief explanation of drawings]

1 and 2 are schematic structural diagrams and partially enlarged views of a winding device according to one embodiment of the present invention, and FIGS. 3 and 4 are schematic structural diagrams of a winding device according to another embodiment of the present invention. The figure and a partially enlarged view, FIG. 5, are structural diagrams of the nozzle portion in both of the embodiments. DESCRIPTION OF SYMBOLS 1... Core support part, 2... Core, 3... Film-like material, 4...
Winding roll, 5... Air machine, 5 _-1 ... Bleeding blower, 5
_-2 ...Air compressor, 6...Contact roller, 7...Proximity roller, 8...Bleed air nozzle, 8'...Blow air nozzle, 9...Bleed air port, 9'...Blow air port, I...Wound contact line.

Claims (1)

[Scope of Claims] 1. When the film-like material 3 is wound around the winding core 2 to obtain a rolled product, the film-like material 3 runs toward the winding roll 4 during winding and the winding contact line A immediately before winding. The atmosphere in the wedge-shaped space formed between the two is connected to the air machine 5 to create a pressure range of positive or negative pressure different from atmospheric pressure, depending on the degree of slipperiness on the surface of the film-like material. Winding of a film-like material characterized by controlling the winding density by adjusting the flow of air that is drawn into the winding roll 4 along with the contact surface of the winding roll 4 of the running film-like material by holding the film-like material. Method. 2 Core support part 1 that rotatably supports the core 2
Then, a film-like material 3 is placed on the winding core 2 supported by the winding core support part 1.
A contact roller 6 is provided so as to be able to come into pressure contact with the surface of the wound roll 4 whose diameter is gradually increased by winding up the material, and the width of the film-like material 3 can be adjusted so as to guide the traveling film-like material 3. It has an air bleed port 9 formed as an elongated opening with a length of the above length, and the air bleed port 9 is brought close to the winding contact line A at the contact position of the contact roller 6, and the outer periphery of the winding roll 4 and the contact roller 6 is In the wedge-shaped space formed between the film-like material 3 immediately before winding, which is attached to the winding contact line A and runs toward the winding contact line A,
an air bleed nozzle 8 disposed opposite to each other parallel to the width direction of the winding contact line 6, and provided so as to be able to maintain a constant relative positional relationship with the contact roller 6;
A winding device comprising a bleed blower _5-1 connected to a winding roll 4, and winding is performed by reducing air drawn between the winding layers of the winding roll 4. 3 Core support part 1 that rotatably supports the core 2
Then, a film-like material 3 is placed on the winding core 2 supported by the winding core support part 1.
A proximal roller 7 is provided whose position can be adjusted to maintain a constant minute distance from the surface of the winding roll 4, which is formed by gradually increasing the diameter by winding up the material, and guides the traveling film-like material 3; It has a jet nozzle 9' formed in an elongated opening with a length equal to or longer than the width of the object 3, and the jet nozzle 9' is brought close to the winding contact line A near the proximity roller 7, so that the winding roll 4 and the Opposed in parallel to the width direction of the winding contact line A in a wedge-shaped space formed between the film-like material 3 attached to the outer periphery of the proximity roller 7 and just before being wound and running toward the winding contact line A. A jet nozzle 8' is arranged so as to be able to maintain a constant relative position relative to the proximity roller 7, and an air compressor _5-2 connected to the jet nozzle 8'. A winding device characterized in that winding is performed by increasing air drawn in.