WO2014065262A1

WO2014065262A1 - Method and apparatus for manufacturing wound body

Info

Publication number: WO2014065262A1
Application number: PCT/JP2013/078537
Authority: WO
Inventors: 昭三柿崎; 公司伊野; 裕寿峯岸
Original assignee: 株式会社クレハ
Priority date: 2012-10-23
Filing date: 2013-10-22
Publication date: 2014-05-01
Also published as: JPWO2014065262A1; CN104520219B; CN104520219A; JP6181064B2

Abstract

Provided are a method and apparatus for manufacturing a wound body in which nonuniformity of width is suppressed when a roll of material is laid out. A wound body manufacturing apparatus (1) is provide with a stretching device (30) for stretching a long, thin film (Rp) of a viscoelastic body, a cutting means (55) for cutting the stretched film (Fp) to a predetermined width, a tension roller (52) for applying longitudinal tension to the film (Fp) cut by the cutting means (55), a winding device (60) for winding the cut film (Fb), and a controller (90). The film (Fp), when cut, is cut while the tension applied to the film (Fp) in the longitudinal direction is varied. The width of the cut film (Fb) can be varied according to the tension, and when a predetermined amount of time has elapsed with the cut film (Fb) in a wound state, it is possible to suppress nonuniformity in the width of the film (Fb) due to the position where the film (Fb) is wound.

Description

Winding body manufacturing method and winding body manufacturing apparatus

The present invention relates to a wound body manufacturing method and a wound body manufacturing apparatus, and more particularly, to a wound body manufacturing method and a wound body manufacturing apparatus that suppress variation in width when placed in an original fabric state.

Food wrap films that wrap food, dishes, or dishes such as dishes with each dish are widely used. The food wrap film is manufactured as follows, for example. A synthetic resin material for a viscoelastic material is melted and extruded into a cylindrical shape. Gas is put into the synthetic resin extruded into a cylindrical shape, and the cylindrical synthetic resin is stretched to form a cylindrical film. A cylindrical film is cut into a strip shape, which is wound up to form a raw material. The film is drawn from the original fabric, rewound in a retail quantity, packed and shipped. In the film production process, when the belt-like film is wound into a raw material, the initial roller of the winding is high tension in order to avoid the generation of wrinkles caused by internal tightening when the film is wound with the same tension. There is a winding tension control device that sets the tension so as to wind tightly (see, for example, Patent Document 1).

JP 6-48654 A (paragraph 0017)

However, even if it is wound with a tension that does not cause wrinkles, if it is placed in the original state before it is subdivided, the radial position of the cylindrical original will be, for example, near the winding axis and on the outer periphery. The width of the belt-like film changes depending on the difference between the distance and the distance between them. When variations occur in the width of the belt-like film in the original fabric state, a wide film and a narrow film are generated between the subdivided films.

An object of this invention is to provide the manufacturing method of a wound body, and a wound body manufacturing apparatus which suppress the dispersion | variation in the width | variety when it has set | placed in the state of the original fabric in view of the above-mentioned subject.

In order to achieve the above object, a method for manufacturing a wound body according to the first aspect of the present invention, for example, stretches an elongated film Rp formed of a viscoelastic body as shown in FIG. 1 and FIG. A stretching step (St3); after the stretching step (St3), a cutting step (St5) for cutting the film Fp to a predetermined width while changing a tension acting in the longitudinal direction of the film Fp; and a cutting step (St5) A winding step (St6) for winding the cut film Fb.

With this configuration, the film is cut into a predetermined width while changing the tension acting in the longitudinal direction of the film, so the width of the film after cutting can be changed according to the tension acting in the longitudinal direction of the film, When a predetermined time elapses in a state where the cut film is wound, it is possible to suppress variation in the width of the film depending on the wound position.

Moreover, if the manufacturing method of the wound body which concerns on the 2nd aspect of this invention is shown with reference to FIG.1, FIG4 and FIG.7 (A), for example, the winding which concerns on the said 1st aspect of this invention will be shown. In the body manufacturing method, the cutting step (St5) starts the winding step (St6) from the time when the film Fp corresponding to the winding start position in the winding step (St6) is cut with the tension acting in the longitudinal direction of the film Fp. ), When the film Fp corresponding to the position of the winding end in FIG. 7 is cut, the film Fp is once reduced continuously and / or stepwise, and then continuously and / or stepwise increased (the solid line T in FIG. 7A). Reference) is configured. Typically, in the cutting step (St5), when the film Fp is cut with a constant tension acting in the longitudinal direction, the wound film is wound up and a predetermined time has passed. When a position where the width of the film becomes narrower than the reference value and a position where the width becomes wider than the reference value are generated (see, for example, FIG. 5); When the film corresponding to the position Lc) of the width Wc in FIG. 5 is cut, the tension acting in the longitudinal direction of the film is reduced, and then the tension acting in the longitudinal direction of the film is increased.

If comprised in this way, when the tension | tensile_strength which acts on the longitudinal direction of a film is cut and it cuts, it will become a film with a large restoration | restoration when the tension | tensile_strength was removed after cutting | disconnection, and a comparatively wide width | variety, and acts on the longitudinal direction of a film When the film is cut with a reduced tension, it becomes a film with a relatively narrow width when the tension is removed after cutting, so when a predetermined time has passed with the cut film wound up Variation in the width of the film due to the wound position can be suppressed.

Moreover, when the manufacturing method of the wound body which concerns on the 3rd aspect of this invention is shown, for example with reference to FIG.1 and FIG.4, the wound body which concerns on the said 1st aspect or 2nd aspect of this invention In the manufacturing method, after a predetermined time has elapsed since the winding step (St6) is completed, the film Fb that has been wound is pulled out, and the length is shorter than the winding length in the winding step (St6). A subdivision process (St7) for rewinding is provided.

If comprised in this way, the dispersion | variation in the width between each subdivided film can be suppressed.

Moreover, when the manufacturing method of the wound body which concerns on the 4th aspect of this invention is shown, for example with reference to FIG.1 and FIG.4, any one of the said 1st aspect thru | or 3rd aspect of the said invention is mentioned. In the manufacturing method of the wound body according to the aspect, the cutting step (St5) is configured to cut the film Fp into a plurality of rows.

If comprised in this way, the production amount of the film after a cutting can be increased and production efficiency can be improved. In addition, when the predetermined width at the time of cutting in the cutting process is set to a width corresponding to the width of the final product, it is not necessary to cut into the width of the final product in the subsequent subdivision process, and the film can be easily rewound. .

In order to achieve the above object, a wound body manufacturing apparatus according to a fifth aspect of the present invention is a stretching apparatus that stretches an elongated film Rp formed of a viscoelastic body, for example, as shown in FIGS. 30; cutting means 55 for cutting the stretched film Fp into a predetermined width (see, for example, FIG. 3); a tension roller 52 for applying a longitudinal tension to the film Fp cut by the cutting means 55; The winding device 60 for winding the film Fb; and the tension acting in the longitudinal direction of the film Fp from the time of cutting the film Fp corresponding to the winding start position by the winding device 60 to the end of winding by the winding device 60 In order to cut the film Fp corresponding to the position once, continuously and / or gradually decrease, and then continuously and / or gradually increase, And a control unit 90 for controlling 52.

If comprised in this way, when the tension | tensile_strength which acts on the longitudinal direction of a film is cut and it cuts, it will become a film with a large restoration | restoration when the tension | tensile_strength was removed after cutting | disconnection, and a comparatively wide width | variety, and it acts on the longitudinal direction of a film. When the film is cut with a reduced tension, it becomes a film with a relatively narrow width when the tension is removed after cutting, so when a predetermined time has passed with the cut film wound up Variation in the width of the film due to the wound position can be suppressed.

According to the present invention, the width of the film after cutting can be changed according to the tension acting in the longitudinal direction of the film, and the film is wound when a predetermined time elapses with the cut film wound up. It is possible to suppress variations in the width of the film depending on the position.

This application is based on Japanese Patent Application No. 2012-233892 filed on October 23, 2012 in Japan, the contents of which form part of the present application.
The present invention will also be more fully understood from the following detailed description. Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, the detailed description and specific examples are preferred embodiments of the present invention and are provided for illustrative purposes only. From this detailed description, various changes and modifications will be apparent to those skilled in the art within the spirit and scope of the invention.
The applicant does not intend to contribute any of the described embodiments to the public, and the disclosed modifications and alternatives that may not be included in the scope of the claims are equivalent. It is part of the invention under discussion.

It is a schematic block diagram of the raw fabric manufacturing apparatus which concerns on embodiment of this invention. It is a partial block diagram of the cooling device which comprises the raw fabric manufacturing apparatus which concerns on embodiment of this invention. It is a figure which shows schematic structure of the cutting apparatus and winding apparatus which comprise the raw fabric manufacturing apparatus which concerns on embodiment of this invention. (A) is a plan view and (B) is a side view. It is a flowchart which shows the original fabric manufacturing process which concerns on embodiment of this invention. It is sectional drawing of an original fabric when predetermined time passes, after winding up the temporary strip | belt-shaped film of fixed width. It is sectional drawing of the original fabric which wound up the strip | belt-shaped film formed with the original fabric manufacturing apparatus which concerns on embodiment of this invention. (A) is sectional drawing of the original fabric immediately after winding up, (B) is sectional drawing of the original fabric when predetermined time passes since winding up. (A) is a graph showing an example of the relationship between the position of the belt-like film and the longitudinal tension at the time of cutting, and (B) was measured by stretching the belt-like film after a predetermined time had passed in the original fabric state. It is a graph which shows a result.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar members are denoted by the same or similar reference numerals, and redundant description is omitted.

First, with reference to FIG. 1, the raw fabric manufacturing apparatus 1 as a wound body manufacturing apparatus which concerns on embodiment of this invention is demonstrated. FIG. 1 is a schematic configuration diagram of an original fabric manufacturing apparatus 1. The raw fabric manufacturing apparatus 1 extends an extruder 10 for extruding a molten synthetic resin material, a cooling device 20 for cooling a parison (tubular resin) Rp extruded from the extruder 10, and a cooled parison Rp. A stretching device 30 that forms a tubular film Fp, a relaxation device 40 that relieves stress applied to the stretched tubular film Fp, a cutting device 50 that cuts the tubular film Fp into a strip film Fb, and a cutting A winding device 60 that winds the belt-like film Fb that has been made into a raw fabric Fr and a control device 90 that controls the operation of the raw fabric manufacturing apparatus 1 are provided. The raw fabric manufacturing apparatus 1 includes an extruder 10, a cooling device 20, a stretching device 30, a relaxation device 40, a cutting device 50, and a winding device 60 arranged in this order. The products of the tubular film Fp and the strip film Fb flow in this order. In the following description, the direction in which the product flows is referred to as “longitudinal direction”, and the direction orthogonal to the longitudinal direction is referred to as “width direction”. In the present embodiment, the width direction extends horizontally.

The synthetic resin raw material charged into the extruder 10 is an object (viscoelastic body) having a property that combines both viscosity and elasticity among polymer substances such as thermoplastic resins. Vinylidene chloride copolymers are used. The vinylidene chloride copolymer is a known vinylidene chloride copolymer having a reduced viscosity of more than 0.035 to 0.075, preferably 0.038 to 0.070, and more preferably 0.040 to 0.065. Should be used. As such a vinylidene chloride copolymer, a copolymer obtained by suspension polymerization is preferably used. For example, it can be copolymerized with 60 to 98% by weight of vinylidene chloride and about 40 to about 2% by weight of vinylidene chloride. It is preferably a copolymer with at least one kind of ethylenically unsaturated monomer. Such ethylenically unsaturated monomers include vinyl chloride, vinyl acetate, vinyl propionate, alkyl acrylate, alkyl methacrylate, acrylic acid, methacrylic acid, itaconic acid and alkyl esters of these acids, acrylonitrile, methacrylonitrile. , Acrylamide, vinyl alkyl ether, vinyl alkyl ketone, acrolein, allyl ester, allyl ether, monoethylenically unsaturated monomers such as styrene; diene unsaturated monomers such as butadiene and chloroprene and these ethylenically unsaturated monomers A copolymer obtained by copolymerizing two or more kinds of monomers can be exemplified.

The extruder 10 has a hopper 11, a screw 13, and a die 15. The hopper 11 supplies a synthetic resin material to one end of the screw 13. The hopper 11 disposed in the extruder 10 has an inverted conical appearance shape in which the lower side is squeezed from the upper side. The synthetic resin raw material introduced into the upper part is dropped while being collected, and the screw 13 It is comprised so that it may guide | lead to one end of. In the present embodiment, the screw 13 has an axis that is horizontally installed, and rotates around the axis so that the synthetic resin material supplied from the hopper 11 to one end is horizontally pumped toward the other end. It is configured. The synthetic resin raw material is melted when being pumped by the screw 13 and reaches the other end in a melted state. The die 15 is disposed at the other end of the screw 13. In the present embodiment, the tip of the die 15 is processed so as to extrude the molten synthetic resin material in a cylindrical shape. A cylindrical synthetic resin extruded from the die 15 is a parison Rp.

The cooling device 20 includes a cooling bus 21, a first pinch roller 23, and a second pinch roller 25. The cooling bath 21 is disposed so as to include a vertically lower region of the die 15 so that the parison Rp pushed out from the die 15 can be received. Cooling water C is stored in the cooling bath 21 so that the parison Rp pushed out from the die 15 can be immersed and cooled. The first pinch roller 23 is composed of a pair of columnar rollers that flatten the cylindrical parison Rp. The first pinch roller 23 extends in the width direction and is submerged in the cooling bath 21 vertically below the die 15. The second pinch roller 25 is disposed so as to extend in the width direction outside the cooling bus 21 away from the first pinch roller 23. The second pinch roller 25 is composed of a pair of cylindrical rollers so that the parison Rp is maintained flat before the parison Rp is sent to the stretching device 30.

Here, the remaining configuration of the cooling device 20 will be described with reference to FIG. The cooling device 20 further includes a circulation tube 27 through which the pile agent P is taken in and out of the cylindrical parison Rp pushed out from the die 15. The pile agent P is a liquid material for preventing adhesion, and is supplied into the parison Rp so that the inner surfaces of the parison Rp that are flattened later can be easily separated. The circulation tube 27 is disposed through the die 15. The circulation tube 27 is connected to an injection tube 28 for injecting the pile agent P and a discharge tube 29 for discharging the circulating pile agent P. The injection tube 28 is provided with an injection valve 28v for opening and closing the flow path. The discharge tube 29 is provided with a discharge valve 29v that opens and closes the flow path. The injection valve 28v and the discharge valve 29v are each connected to a pile agent control unit 91 (see FIG. 1) constituting the control device 90 by a signal cable. The pile agent control unit 91 is configured to be able to open or close the valve or adjust the opening of the valve by transmitting an opening / closing signal to each of the injection valve 28v and the discharge valve 29v. . The pile agent control unit 91 can inject the pile agent P into the circulation tube 27 (circulation flow path of the pile agent P) by opening the injection valve 28v, and can open the circulation tube 27 by opening the discharge valve 29v. 27 (pile agent P circulation flow path) is configured so that the pile agent P can be discharged.

The pile agent P in the parison Rp does not flow out excessively downstream of the first pinch roller 23 because the pair of first pinch rollers 23 presses the flat parison Rp. The pile agent P in the parison Rp is disconnected from the cooling water C outside the parison Rp, and the liquid level can be changed independently of the water surface of the cooling water C. Therefore, the liquid level of the pile agent P in the parison Rp is changed by opening and closing the injection valve 28v and the discharge valve 29v and putting the pile agent P into and out of the circulation passage (circulation tube 27) of the pile agent P. Is possible. The pile agent control unit 91 adjusts the flow rate of the pile agent P entering and exiting the parison Rp so that the level of the pile agent P in the parison Rp is equal to or higher than the surface of the cooling water C outside the parison Rp. Yes. The portion of the pile agent P in the parison Rp above the water surface of the cooling water C has its gravity (pressure due to the gravity) applied to the parison Rp between the water surface of the cooling water C and the liquid surface of the pile agent P. It will act in the direction of expanding the diameter of the parison Rp. The gravity of the pile agent P applied to the parison Rp between the water surface of the cooling water C and the liquid surface of the pile agent P increases as the distance between the water surface of the cooling water C and the liquid surface of the pile agent P increases. Therefore, the larger the distance between the water surface of the cooling water C and the liquid surface of the pile agent P, the larger the parison Rp diameter immersed in the cooling water C. Thus, the parison Rp diameter immersed in the cooling water C can be changed by changing the liquid level of the pile agent P in the parison Rp.

The description of the configuration of the raw fabric manufacturing apparatus 1 will be continued with reference mainly to FIG. The stretching device 30 is a device that stretches the parison Rp that has come out of the cooling device 20 with the internal pressure of the enclosed air to form a tubular film Fp that is thinner than the parison Rp. In the present embodiment, the tubular film Fp is formed by biaxial stretching of the parison Rp and plastic deformation. The stretching device 30 has a third pinch roller 35. The third pinch roller 35 is disposed at the downstream end of the stretching device 30. The third pinch roller 35 is composed of a pair of columnar rollers that sandwich and flatten a cylindrical tubular film Fp.

The relaxation device 40 is a device that relieves stress applied to the tubular film Fp by the stretching device 30. The relaxation device 40 is configured so that a small tension as much as possible is applied to the flat tubular film Fp between the stretching device 30 and the cutting device 50 to transport the flat tubular film Fp. The relaxation device 40 has a guide roller group 41 that supports the flat tubular film Fp. The relaxation device 40 is configured such that a flat cylindrical film Fp is conveyed toward the cutting device 50 while appropriately contacting between a plurality of rollers of the guide roller group 41 on the upper surface or the lower surface.

The configuration of the cutting device 50 and the winding device 60 will be described with reference to FIG. 3A and 3B are diagrams illustrating schematic configurations of the cutting device 50 and the winding device 60, in which FIG. 3A is a plan view and FIG. 3B is a side view. The cutting device 50 includes a fourth pinch roller 51 and a fifth pinch roller 56 that sandwich the flat tubular film Fp, a tension roller 52 that adjusts the tension acting in the longitudinal direction of the tubular film Fp, and the tubular film Fp. And a cutting blade 55 as a cutting means. Each of the fourth pinch roller 51 and the fifth pinch roller 56 is composed of a pair of cylindrical rollers so that the flat cylindrical film Fp can be sandwiched. The fourth pinch roller 51 is disposed adjacent to the relaxation device 40. The fifth pinch roller 56 is disposed adjacent to the winding device 60 and spaced from the fourth pinch roller 51.

The tension roller 52 is disposed near the fourth pinch roller 51 between the fourth pinch roller 51 and the fifth pinch roller 56. The tension roller 52 is disposed in contact with the upper surface of the flat cylindrical film Fp. The tension roller 52 is configured so that a downward force is applied by an air cylinder (not shown), and is configured to apply tension in the longitudinal direction of the flat tubular film Fp. The tension roller 52 mainly applies tension to the flat cylindrical film Fp at the time of cutting, but does not allow the tension to act in the width direction. Support rollers 53 are provided on both upstream and downstream sides adjacent to the tension roller 52. The tension roller 52 can move vertically up and down according to the force received from the air cylinder (not shown) and the rotation speed of the fifth pinch roller 56, thereby changing the longitudinal tension of the flat tubular film Fp. It is configured to be able to. An air cylinder (not shown) that applies a downward force to the tension roller 52 is connected to a tension control unit 92 that constitutes the control device 90 by a signal cable, and the tension is set with a force set by a signal from the tension control unit 92. The roller 52 can be urged downward. The larger the set value for urging the tension roller 52 downward, the greater the tension in the longitudinal direction of the flat tubular film Fp, and the smaller the set value, the smaller the tension.

The cutting blade 55 is disposed near the fifth pinch roller 56 between the tension roller 52 and the fifth pinch roller 56. A plurality of the cutting blades 55 are arranged at intervals at which the belt-like film Fb can have a predetermined width in a direction orthogonal to the direction in which the flat cylindrical film Fp flows. Here, in the present embodiment, the predetermined width is a width corresponding to the width when the strip-shaped film Fb is a final product (a width that takes into account a change from immediately after cutting to the start of subdivision, which will be described later). is there. A cutting roller 54 that extends in the direction in which the cutting blades 55 are arranged is disposed below the plurality of cutting blades 55. Grooves are formed on the outer surface of the cutting roller 54 at positions corresponding to the arranged cutting blades 55. The cutting device 50 inserts a cutting blade 55 into a groove formed in the cutting roller 54 in a state where the flat cylindrical film Fp is in contact with the outer surface of the cutting roller 54, thereby generating the flat cylindrical film Fp. It is comprised so that it can cut | judge to the width | variety of anti-Fr. From the flat cylindrical film Fp cut by the cutting blade 55, two strip films Fb are generated vertically between one adjacent cutting blade 55.

The cutting device 50 further includes a width detector 58. The width detector 58 is disposed between the tension roller 52 and the cutting blade 55. The width detector 58 is configured as a pair so that the positions of both outer edges in the width direction of the flat cylindrical film Fp can be detected. The width detector 58 is connected to the pile agent control unit 91 via a signal cable, and transmits the detected width of the flat tubular film Fp (the distance between the outer edges on both sides) to the pile agent control unit 91 as a signal. It is configured to be able to.

The winding device 60 includes a first winding roller 61 that winds the upper strip-shaped film Fb of the strip-shaped film Fb that has been cut by the cutting blade 55 and divided into upper and lower portions, and a second winding that winds the lower strip-shaped film Fb. And a roller 62. Between the fifth pinch roller 56 and the first take-up roller 61, a first expander roller 65 is provided that divides the strip-like film Fb cut into a plurality of rows into each row. Between the 5th pinch roller 56 and the 2nd winding roller 62, the 2nd expander roller 66 which divides | segments the strip | belt-shaped film Fb cut | disconnected into the multiple row | line | column into each row | line | column is arrange | positioned.

Returning to FIG. 1 again, the description of the configuration of the raw fabric manufacturing apparatus 1 will be continued. The control device 90 includes a drive control unit 93 in addition to the pile agent control unit 91 and the tension control unit 92 described above. The pile agent control unit 91 sends an open / close signal to the injection valve 28v or the discharge valve 29v based on a signal relating to the width of the flat tubular film Fp received from the width detector 58, thereby opening and closing the valve. It is comprised so that the liquid level of the pile agent P in Rp can be controlled. The tension control unit 92 changes the force applied to the tension roller 52 by an air cylinder (not shown) based on a program prepared in advance, thereby adjusting the longitudinal tension applied to the flat tubular film Fp at the time of cutting. It is configured so that it can be controlled. The drive control unit 93 is configured to be able to control the start and stop of the drive unit of the raw fabric manufacturing apparatus 1 such as the screw 13 and the first to

fifth pinch rollers

23, 25, 35, 51, and 56. Yes. In FIG. 1, the pile agent control unit 91, the tension control unit 92, and the drive control unit 93 are illustrated as being configured separately, but this is conceptually expressed separately from the viewpoint of function. Yes, it may be physically integrated. Further, in FIG. 1, the pile agent control unit 91, the tension control unit 92, and the drive control unit 93 are shown to be housed in one housing and constitute the control device 90. These may be physically disposed separately.

With continued reference to FIG. 4, the operation of the raw fabric manufacturing apparatus 1 will be described. The manufacturing process of the raw fabric Fr by the raw fabric manufacturing apparatus 1 is an aspect of the method for manufacturing a wound body according to the embodiment of the present invention. FIG. 4 is a flowchart showing the raw fabric manufacturing process. In the following description of the operation, when referring to the configuration of the raw fabric manufacturing apparatus 1, FIGS. 1 to 3 will be referred to as appropriate. In the raw fabric manufacturing apparatus 1, a synthetic resin raw material supplied from a raw material tank (not shown) is introduced into the hopper 11. The synthetic resin raw material introduced into the hopper 11 is led out from the lower end of the hopper 11 to one end of the screw 13 and is pumped toward the die 15 while being melted by rotation around the axis of the screw 13. The molten synthetic resin raw material that has reached the die 15 is extruded from the die 15 to become a parison Rp (extrusion step: St1).

The parison Rp pushed out from the die 15 is charged into the cooling water C stored in the cooling bath 21 and cooled (cooling step: St2). The pile agent P is supplied to the inside of the parison Rp charged into the cooling water C through the circulation tube 27. The parison Rp is also cooled by the pile agent P. That is, the cooling step (St2) is a step in which the parison Rp is cooled by the cooling water C and the pile agent P. The pile agent P whose temperature has been increased by cooling the parison Rp is guided to a temperature controller (not shown) through the circulation tube 27, and instead the cooled pile agent P is sent to the parison Rp through the circulation tube 27. Supplied inside. Thus, the pile agent P inside the parison Rp is circulated and cooling of the parison Rp is continued. The parison Rp cooled by the cooling water C and the pile agent P is pressed by the first pinch roller 23 and becomes flat. In the flat parison Rp, the pile agent P to the extent that it adheres to the surface remains. The flat parison Rp that has passed through the first pinch roller 23 continues to be cooled while in the cooling water C, and then passes through the second pinch roller 25.

The flat parison Rp that has passed the second pinch roller 25 is filled with air in the stretching device 30 and stretched by the internal pressure of the air (stretching step: St3). Note that the air inside the parison Rp in the stretching device 30 is the second in a state where air is put into the parison Rp or the tubular film Fp in the initial stage before the raw fabric manufacturing apparatus 1 enters the steady operation. It is enclosed by being pinched by the pinch roller 25 and the third pinch roller 35. Once air is put into the parison Rp or the tubular film Fp, the air inside remains between the second pinch roller 25 and the third pinch roller 35 even if the parison Rp and the tubular film Fp flow. It becomes. The parison Rp in which air has entered the downstream side of the second pinch roller 25 is biaxially stretched to form a tubular film Fp. Thereafter, the cylindrical film Fp is flattened by the third pinch roller 35.

The flat cylindrical film Fp that has passed through the third pinch roller 35 is supported by the guide roller group 41 in a state where the tension is relaxed. The state in which the tension is relaxed is typically a state in which a minimum tension necessary for transporting the flat tubular film Fp is applied. In the flat tubular film Fp, the stress applied in the stretching step (St3) is eased by lowering the rotational speed of the fourth pinch roller 51 than the rotational speed of the third pinch roller 35 (relaxation process: St4). The flat cylindrical film Fp supported by the guide roller group 41 is pulled by the fourth pinch roller 51.

The flat cylindrical film Fp that has passed through the fourth pinch roller 51 reaches the cutting blade 55 via the tension roller 52 and the support roller 53 by being pulled by the fifth pinch roller 56. The flat cylindrical film Fp that has reached the cutting blade 55 is cut into a plurality of rows by the width of a wrap roll manufactured by subdivision described later by the cutting blade 55 in a state in which a longitudinal tension is applied. Fb (cutting step: St5). The number of rows of the belt-like film Fb manufactured depends on the width of the wrap roll manufactured by subdivision. As described above, in the present embodiment, the width corresponding to the width of the wrap roll manufactured by subdivision corresponds to the predetermined width. The cut ends (ears of the flat tubular film Fp) of the tubular film Fp generated outside the outermost cutting blades 55 may be reused after being collected.

In the cutting device 50, the flat cylindrical film Fp cut by the cutting blade 55 may not be sufficient for the total width of the strip-shaped film Fb for the divided rows if the length in the width direction is too short. On the other hand, if the length in the width direction is too long, the thickness of the tubular film Fp is reduced, and the cut ends on both sides that are generated when cutting is increased, resulting in increased waste of material. Accordingly, the pile agent control unit 91 detects the width of the flat tubular film Fp before being cut by the cutting blade 55 by the width detector 58 in order to appropriately maintain the width of the flat tubular film Fp. is doing. The width detector 58 transmits the detected width of the flat tubular film Fp to the pile agent control unit 91 as needed. When the width of the received flat cylindrical film Fp is equal to or less than a predetermined value, the pile agent control unit 91 opens the injection valve 28v to inject the pile agent P into the circulation tube 27, and the pile agent Py in the parison Rp Increase the amount of agent P and increase the diameter of the parison Rp. The pile agent control unit 91 closes the injection valve 28v when the level of the pile agent P in the parison Rp becomes appropriate. On the other hand, when the width of the received flat cylindrical film Fp is equal to or larger than a predetermined value, the pile agent P circulating in the circulation tube 27 is discharged by opening the discharge valve 29v, and the pile agent in the parison Rp is discharged. The liquid level of P is brought close to the water surface of the cooling water C, and the diameter of the parison Rp is reduced. The pile agent control section 91 closes the discharge valve 29v when the level of the pile agent P in the parison Rp becomes appropriate. There is a time lag until the adjusted diameter of the parison Rp is reflected in the width of the flat cylindrical film Fp detected by the width detector 58, but the diameter of the parison Rp and the flat cylindrical film Fp Since the change in the width of the flat tubular film Fp is appropriate, the margin of the flat tubular film Fp is set to an appropriate value by allowing for a predetermined amount as a trigger for increasing or decreasing the amount of the pile agent P withdrawn into and out of the circulation tube 27. It can be kept in range. In addition, the length of the parison Rp and the tubular film Fp between the die 15 and the cutting blade 55 is several tens of meters, which is sufficiently larger than a length of several thousand meters that is a winding length of an original fabric Fr described later. The time lag is not a problem because it is short.

The belt-like film Fb produced by cutting the flat tubular film Fp with the cutting blade 55 is fed out from the fifth pinch roller 56, and the upper belt-like film Fb is first wound through the first expander roller 65. The lower belt-like film Fb is wound around the bobbin mounted on the second winding roller via the second expander roller 66 (winding step: St6). In the present embodiment, when the belt-like film Fb is wound around the first winding roller 61 or the second winding roller 62, the winding method is a winding method commonly used in the technical field, and gradually from the winding start to the winding end. The tape is wound with a taper tension that reduces the tension. From the viewpoint of improving production efficiency, the length of the strip film Fb wound around one bobbin may be 1000 m or more, preferably 3000 m or more, and more preferably 5000 m or more. The strip film Fb near the bobbin and the winding center may be used. From the viewpoint of reducing the stress acting on the surface, it may be 9000 m or less, preferably 7000 m or less, more preferably 6000 m or less. A belt-like film Fb wound around a bobbin with a predetermined length is an original fabric Fr. The manufactured raw fabric Fr is stored in a warehouse or the like until it is subdivided.

The original fabric Fr once stored is transported to a lap roll manufacturing apparatus (not shown) which is an apparatus different from the original fabric manufacturing apparatus 1, and then the strip-shaped film Fb is pulled out from the original fabric Fr. The wrap roll is subdivided into lengths (for example, 20 m, 50 m, etc.) (subdivision process: St7). Here, it can be said that the wrap roll is also a wound body in which a belt-like film is wound. That is, the wrap roll is a form of a wound body together with the raw fabric Fr. In the present embodiment, the wrap roll is a final product for consumers, and the original fabric Fr is an intermediate product. Since the raw fabric Fr has already been cut to a width corresponding to the width of the wrap roll in the cutting step (St5), it is not necessary to cut again in the subdivision step (St7). Rewinding of the strip film Fb is simplified. The manufactured wrap roll is affixed with a seal that makes it easy to find the end of the belt-like film Fb (the first part to use), and is stored in a rectangular parallelepiped carton whose lid can be opened and closed. Is done.

By the way, if the width of the strip-shaped film derived from the cutting device 50 is constant (hereinafter, this assumed strip-shaped film is referred to as “temporary strip-shaped film”), the stored raw fabric Fr is in other words. When a temporary strip-shaped film of a certain width is wound up to become an original fabric, the width of the temporary strip-shaped film is closer to the bobbin than the outer peripheral side of the original fabric far from the bobbin due to the passage of time during storage. Will become wider.
FIG. 5 is a cross-sectional view of the original fabric Fr ′ when a predetermined time has elapsed since the provisional strip film having a certain width (hereinafter, the provisional strip film is indicated by “Fb ′”) is wound up. It is. The predetermined time referred to here is a time during which the provisional belt-like film Fb ′ is wound up to be a raw fabric Fr ′ and then stored until it is subdivided, and is approximately 3 in the present embodiment. Within days. As shown in FIG. 5, when a predetermined time has elapsed, the width Wc of the temporary strip film Fb ′ at the position Lc closer to the bobbin B than the center in the radial direction is maximized because the strip film is viscoelastic. Because it is a body, it is presumed that the compressive force of the temporary belt-like film Fb ′ wound outside acts. The innermost width Wb, which is the width of the temporary belt-like film Fb ′ at the position Lb adjacent to the bobbin B, is not wider than the width of the temporary belt-like film Fb ′ immediately outside the bobbin B. It is presumed that the frictional force acting during the period suppresses the spread of the width of the temporary belt-like film Fb ′. Although the spread of the innermost width Wb is suppressed by the frictional resistance with the bobbin B, the outermost position La of the original fabric Fr ′ is also applied because the compressive force of the temporary strip-shaped film Fb ′ wound outside is also applied. It is wider than the outermost width Wa which is the width of the temporary band-like film Fb ′. Note that the width of the temporary belt-like film Fb ′ shown in FIG. 5 is exaggerated for convenience of explanation, and the actual width is not so different. In general, the width of the temporary strip film Fb ′ that becomes the original fabric Fr ′ that changes per unit time becomes smaller as the elapsed time from the original fabric Fr ′ becomes longer. As described above, when the width of the temporary belt-like film Fb ′ of the stored raw fabric Fr ′ is varied, a lap roll having a different width is manufactured when it is subdivided into a wrap roll. The inconvenience arises.

In anticipation of a portion of the strip-shaped film Fb corresponding to the position where the width of the temporary strip-shaped film Fb ′ of the original fabric Fr after a predetermined time has elapsed from the provisional strip-shaped film Fb ′, the strip-shaped film of that portion The present invention was conceived by establishing and demonstrating the hypothesis that if the width of Fb is narrowed in advance and wound around the bobbin B, the same width will be obtained when a predetermined time has elapsed. did. In the raw fabric manufacturing process by the raw fabric manufacturing apparatus 1 that embodies this idea, the following control is performed when the flat tubular film Fp is cut.

That is, since the strip-shaped film Fb (tubular film Fp) is a viscoelastic body, if the flat tubular film Fp is elastically deformed and cut, the width of the strip-shaped film Fb is widened when the elastic energy is removed and restored. When cutting a portion where the width of the strip-shaped film Fb immediately after cutting is wider than the width at the reference position, the longitudinal tension is set larger than when cutting the reference position, and the strip-shaped film immediately after cutting is used. When cutting a portion where the width of the film Fb is desired to be narrower than the width at the reference position, the tension in the longitudinal direction is made smaller than when cutting the reference position. The greater the tension acting in the longitudinal direction at the time of cutting, the wider the width of the strip-shaped film Fb when the elastic energy is removed and restored.

The tension control unit 92 stores data on the change in the width of the temporary belt-like film Fb ′ as shown in FIG. 5 in advance, and is cut by changing the downward force applied to the tension roller 52 at an appropriate position. The tension acting in the longitudinal direction of the flat cylindrical film Fp is changed. Specifically, the tension control unit 92 increases the downward force applied to the tension roller 52 by the air cylinder (not shown) when the tension in the longitudinal direction of the strip film Fb is to be increased. When it is desired to reduce the tension, the downward force applied to the tension roller 52 by the air cylinder (not shown) is reduced. The magnitude of the downward force applied by the air cylinder (not shown) to the tension roller 52 is determined as follows, for example. First, it is estimated which position (distance from the surface of the bobbin B) the band-shaped film Fb of the cut portion will be when wound on the bobbin B (hereinafter referred to as “estimated position”). Next, assuming that a predetermined time has passed since the temporary belt-like film Fb ′ is wound around the bobbin B, the temporary belt-like film Fb whose width at the estimated position is the reference position Lb is assumed. It is estimated how much the difference is with respect to the width Wb (reference value) of '. In addition, although the strip | belt-shaped film Fb of a reference | standard position can be arbitrarily determined in the position used as the width | variety between the minimum width Wa and the maximum width Wc, in this Embodiment, the strip | belt-shaped film Fb in contact with the bobbin B is used. Is a belt-like film Fb at the reference position Lb. Then, according to the degree of difference between the width of the temporary strip film Fb ′ at the estimated position and the width of the temporary strip film Fb ′ at the reference position Lb, the width of the temporary strip film Fb ′ at the estimated position is the reference position. When the width is larger than the width of the temporary belt-like film Fb ′ at Lb (for example, at the position Lc), the set value of the downward force applied to the tension roller 52 is reduced, and the longitudinal direction acting on the flat tubular film Fp When the tension is reduced, for example (at the position La), the set value of the downward force applied to the tension roller 52 is increased to increase the longitudinal tension acting on the flat tubular film Fp.

In other words, if it is cut with a constant tension acting in the longitudinal direction of the film Fp in the cutting step (St5), the wound film Fb ′ is wound and the wound film is wound when a predetermined time has elapsed. When the position of Fb ′ includes a position narrower than the reference value Wb (position La in FIG. 5) and a position wider than the reference value Wb (position Lc in FIG. 5); the cutting step (St5) When the film Fp corresponding to the position where the width of the wound film Fb is narrower than the reference value Wb is cut, the tension acting in the longitudinal direction of the film Fp according to the deviation from the reference value Wb When the film Fp corresponding to the position where the width of the film Fp wound up is wider than the reference value Wb is cut when the width of the wound film Fp is temporary, the film Fp is cut according to the deviation from the reference value Wb. To reduce the tensile force acting in the longitudinal direction of Lum Fp.

FIG. 6 shows the state of the width of the strip-shaped film Fb formed by cutting while changing the longitudinal tension of the flat cylindrical film Fp in the state of the original fabric Fr. FIG. 6A is a cross-sectional view of the raw fabric Fr immediately after winding the belt-like film Fb whose width is appropriately changed according to the position in the longitudinal direction, and FIG. 6B is a diagram depending on the position in the longitudinal direction. It is sectional drawing of original fabric Fr when predetermined time passes, after winding up the strip | belt-shaped film Fb which changed the width | variety appropriately. As shown in FIG. 6A, immediately after winding the belt-like film Fb, the width of the belt-like film Fb at the position closer to the bobbin B is narrowest than the center in the radial direction. Note that the width of the belt-like film Fb shown in FIG. 6A is exaggerated for convenience of explanation, and the actual width is not so different. In the cross section of the original fabric Fr shown in FIG. 6A, the contours on both sides are symmetrical as compared with the cross section of the original fabric Fr ′ shown in FIG. The original fabric Fr immediately after winding shown in FIG. 6 (A), when a predetermined time elapses, as shown in FIG. 6 (B), the inner side (side closer to bobbin B) and the outer side (side far from bobbin B). The difference in width becomes smaller. In addition, although the raw fabric Fr which predetermined time passed after winding up shown in FIG.6 (B) is shown so that the width | variety of the strip | belt-shaped film Fb used as the raw fabric Fr may be equal throughout, FIG. B) shows the concept (trend), and strictly speaking, there may be a slight variation in the width of the strip film Fb. Even in that case, the variation in the width of the strip-shaped film Fb in the original fabric Fr after a predetermined time has passed after winding is the width of the strip-shaped film Fb in the original fabric Fr immediately after winding (see FIG. 6A). It is significantly smaller than the variation.

FIG. 7A shows a graph of an example of the relationship between the position of the strip-shaped film Fb and the tension in the longitudinal direction when the flat cylindrical film Fp is cut. The horizontal axis of the graph shown in FIG. 7A is the percentage of the winding length of the strip film constituting the original fabric, and the vertical axis is the tension in the longitudinal direction per 300 mm width of the strip film. In the case of a book, the tension on the vertical axis in FIG. In the graph of FIG. 7A, the solid line T is for forming a band-shaped film Fb whose width is appropriately changed according to the position in the longitudinal direction, and the alternate long and short dash line T ′ is a temporary band-shaped film Fb having a constant width. 'Is in forming. When forming the temporary strip film Fb ', the tension acting in the longitudinal direction of the flat tubular film Fp at the time of cutting is kept constant at 1.1 kg. On the other hand, when forming the strip-shaped film Fb having a variable width, from 1.1 kg to 0.7 kg from the position at which the bobbin B starts to be wound (hereinafter referred to as “starting point”) to a position less than 20% of the total length. And gradually increase from 0.7 kg to 1.25 kg from a position of less than 20% of the total length to a position of over 50% of the total length, and from a position of more than 50% of the total length to over 80% of the total length. 1.25kg is constant over the position of, and gradually increases from 1.25kg to 1.4kg from a position of over 80% of the full length to a position of over 90% of the full length, and 100 from a position of over 90% of the full length. It is constant at 1.4 kg over the% position. In general, the tension acting in the longitudinal direction of the flat tubular film Fp at the time of cutting is once reduced and then increased.

FIG. 7B shows a result of measuring the width by stretching the strip films Fb and Fb ′ after a predetermined time has passed in the original fabric state. The horizontal axis of the graph shown in FIG. 7B is the percentage of the winding length of the strip film constituting the original fabric, and the vertical axis is the width of the strip film. The graph in FIG. 7B is the result of measuring the width by completely pulling out the strip films Fb and Fb ′, and the width at the 0% position in the graph is that of the starting point (the point in contact with the bobbin B). , The width at the position of 100% is the outermost surface of the original fabrics Fr and Fr ′. In FIG. 7B, the solid line W indicates the width of the strip-shaped film Fb, and the alternate long and short dash line W ′ indicates the width of the temporary strip-shaped film Fb ′. As is clear from FIG. 7B, in the belt-like film Fb whose width is appropriately changed according to the position in the longitudinal direction, when a predetermined time elapses in the state of the original fabric Fr, the change in the width depending on the position in the longitudinal direction. Is within 2 mm, and variation in width is suppressed as compared with the temporary belt-like film Fb ′.

As described above, according to the raw fabric manufacturing apparatus 1 and the raw fabric manufacturing process according to the present embodiment, a predetermined tension is applied while changing the tension acting in the longitudinal direction when the flat tubular film Fp is cut. Since the width of the strip-shaped film Fb immediately after cutting can be appropriately changed according to the position in the longitudinal direction by cutting into the width, the strip-shaped film when a predetermined time has passed after being wound up to be the original fabric Fr Variation in the width of Fb can be suppressed. By suppressing the variation in the width of the strip-shaped film Fb in the state of the original fabric Fr, the variation in the width of each wrap roll can be suppressed when the original fabric Fr is subdivided into wrap rolls.

In the above description, the synthetic resin raw material is a polyvinylidene chloride copolymer, but the main component is a viscoelastic material other than the polyvinylidene chloride copolymer such as polyvinyl chloride, polyamide, polyester, polyolefin, etc. Synthetic resin raw material may be used. The belt-like film Fb is typically a single layer film, but may be a multilayer film.

In the above description, the synthetic resin extruded from the die 15 is cylindrical, but the cross section perpendicular to the axis other than the cylinder may be a cylinder such as a polygon or an ellipse, or a film or plate. When the synthetic resin extruded from the die is in the form of a film or plate, a flat die method or the like is used in the stretching step instead of the inflation method. The tip shape of the die is appropriately determined according to the shape of the extruded synthetic resin.

In the above description, the predetermined width of the strip-shaped film Fb cut in the cutting step (St5) is the width corresponding to the width of the subdivided wrap roll (final product). For example, only the outer side (flat band-like film ears) of the outermost cutting blades 55 may be cut off so as to have the width of the minute, and cut into the width of the wrap roll (final product) in the subdivision process. However, in the cutting step (St5), if the width of the belt-like film Fb is cut with a width corresponding to the width of the subdivided wrap roll (final product), the width of the wrap roll (final product) is changed to the width of the subdivision. There is no need to cut, and the manufacturing efficiency of the wrap roll can be improved.

In the above description, when the tubular film Fp corresponding to the position where the width of the wound belt-like film Fb is narrower than the reference value Wb in the case of the temporary belt-like film Fb ′ is cut off from the reference value Wb. Accordingly, the tensile force acting in the longitudinal direction of the tubular film Fp is increased, and the tubular film corresponding to the position where the width of the wound film Fp is wider than the reference value Wb in the case of the provisional film Fb ′. When cutting the film Fp, the tension acting in the longitudinal direction of the tubular film Fp is reduced according to the deviation from the reference value Wb, but the tolerance of the variation in the width of the strip film Fb in the raw fabric Fr Depending on the set value of the winding tension when winding the belt-like film Fb, the tension acting in the longitudinal direction of the tubular film Fp during cutting according to the deviation from the reference value Wb must be strictly changed. If sufficient, the tensile force acting in the longitudinal direction of the tubular film Fp during cutting in accordance with the deviation from the reference value Wb may not strictly changed. In other words, the longitudinal length of the tubular film Fp at the time of cutting in consideration of the change in the width of the temporary strip film Fb ′ obtained experimentally so that the variation in the width of the strip film Fb in the raw fabric Fr is within an allowable range. What is necessary is just to change suitably the tension which acts on a direction.

The use of nouns and similar directives used in connection with the description of the present invention (especially in connection with the claims below) is not specifically pointed out herein or clearly contradicted by context. , As both singular and plural. The phrases “comprising”, “having”, “including”, and “including” are to be interpreted as open-ended terms (ie, “including but not limited to”) unless otherwise specified. The use of numerical ranges in this specification is intended only to serve as a shorthand for referring individually to each value falling within that range, unless otherwise indicated herein. Each value is incorporated into the specification as if it were individually listed herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. Any examples or exemplary language used herein (eg, “such as”) is intended to be merely a better illustration of the invention, unless otherwise stated, and to limit the scope of the invention. is not. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.

In the present specification, preferred embodiments of the present invention are described, including the best mode known to the inventors for carrying out the invention. Variations of these preferred embodiments will become apparent to those skilled in the art after reading the above description. The present inventor expects skilled workers to apply such modifications as appropriate, and intends to implement the present invention in a manner other than that specifically described herein. . Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.

DESCRIPTION OF SYMBOLS 1 Raw fabric manufacturing apparatus 30 Stretching apparatus 50 Cutting apparatus 52 Tension roller 55 Cutting blade 60 Winding apparatus 90 Control apparatus Fb Strip-shaped film Fb 'Temporary strip-shaped film Fp Cylindrical film Rp Parison

Claims

A stretching step of stretching an elongated film formed of a viscoelastic body;
A cutting step of cutting the film into a predetermined width while changing the tension acting in the longitudinal direction of the film after the stretching step;
A winding step of winding up the film cut in the cutting step;
A method for manufacturing a wound body.
The film corresponding to the winding end position in the winding process from when the cutting process cuts the film corresponding to the winding start position in the winding process with the tension acting in the longitudinal direction of the film. Constructed to decrease continuously and / or stepwise and then increase continuously and / or stepwise over the time of cutting;
The manufacturing method of the wound body of Claim 1.
A subdivision step of drawing out the film that has been wound up after a lapse of a predetermined time from the completion of the winding step and rewinding the film at a length shorter than the winding length in the winding step;
The manufacturing method of the wound body of Claim 1 or Claim 2.
The cutting step is configured to cut the film into a plurality of rows;
The manufacturing method of the wound body of any one of Claim 1 thru | or 3.
A stretching apparatus for stretching an elongated film formed of a viscoelastic body;
Cutting means for cutting the stretched film into a predetermined width;
A tension roller for applying a longitudinal tension to the film cut by the cutting means;
A winding device for winding the cut film;
The tension acting in the longitudinal direction of the film is cut from when the film corresponding to the position of the winding start by the winding device to when cutting the film corresponding to the position of the winding end by the winding device, A control device for controlling the tension roller so that the tension roller is once reduced continuously and / or stepwise and then continuously and / or stepwise increased;
Winding body manufacturing equipment.