JP2009203055A - Method for manufacturing web roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a web roll, including a process of heating the web, capable of strongly enlarging its width, while preventing heat shrinkage of the web, and avoiding meandering of the web. <P>SOLUTION: The method for manufacturing a web roll comprises a process of heating the web, and a process of taking up the web into a roll. The method comprises: a distortion providing process of preliminarily providing the web with a distortion by means of a set of cloth guiders, constituted of a pair of roller groups for holding the width end parts of the web, in such a way that outer circumferential parts of at least one side roller of the roller groups which abuts against the web get, in contact with the web along the entire axial length; and a process of heating the web, immediately thereafter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a web roll.

  Generally, a web such as a plastic film is often wound into a roll after undergoing various surface treatments after film formation. Examples of the various processes include steps aimed at enhancing the functionality of the web, such as depositing a metal film on the web surface, laminating heterogeneous or homogeneous webs and winding them up again in a roll shape. These processes are preferably performed uniformly over the entire length and the entire width of the web. For example, when wrinkles occur in the web, defective products due to film removal by vapor deposition, voids in laminate, and the like are caused. For example, in the high-temperature laminating step, an adhesive layer is provided between, for example, a metal foil to be bonded to a web serving as a base material, and bonding is performed by sandwiching them from the web side and the metal foil side with a pair of laminating rollers. Often, the excess web is wrinkled by thermal expansion of the web due to heat received from the laminating roller.

  As a means for stretching wrinkles in such a high-temperature laminating process, it has been proposed to install a widening device immediately before the laminating roller as in Patent Document 1. According to this method, wrinkles generated in the high-temperature laminating portion can be prevented by widening the web with a widening device immediately before that, and the amount of widening is 100.05 to 100.5% in terms of stretch rate ( The strain may be 0.05-0.5%). Here, although the definition of the expansion ratio is not described in the same publication, generally, the width of the web after widening is divided by the width of the web before widening and multiplied by 100. In order to obtain the strain therefrom, the width of the web before widening is subtracted from the width of the web after widening and multiplied by 100. In addition to the cross guider, an expander roller or a banana roller can be used as the widening device used here. Here, the cross guider means that a pair of rollers for narrowing the web from the front and back as shown in FIG. 4 is rotated at an angle of θ in the web conveyance direction at both ends of the web as shown in FIG. This means a means for widening the web by conveying it toward the side.

  However, according to the knowledge of the inventors of the present application, in order to prevent wrinkles generated in a heating process such as a high-temperature laminating process by widening by a cross guider immediately before the upstream side, it is necessary to give a strain corresponding to a thermal expansion strain. Yes, this value varies depending on the temperature conditions and the elastic modulus of the web. Therefore, the expansion ratio is not uniformly given as 100.05 to 100.5 as in Patent Document 1, and it is necessary to give a stronger distortion. Further, according to the knowledge of the inventor of the present application, in order to apply a strong strain with the cross guider as described above, it is necessary to increase the surface pressure and the friction coefficient between the rollers of the cross guider. There was a problem that the web meandered when they were slightly different. Moreover, in the widening using an expander roller or a banana roller as in Patent Document 1, the widening force is insufficient and insufficient to impart the strain.

  On the other hand, as a meandering prevention technique when a cross guider is used, for example, according to Patent Document 2, a narrow pressure width at a web end is determined in each web width direction by a signal from an edge detector that detects the position of the edge of the web. There has been proposed an apparatus for correcting meandering by moving a pair of pinch rollers in the web width direction so as not to change at the ends. According to this apparatus, since the narrow pressure width at both ends in the web width direction is made constant by adjusting the position of the pinch roller, the web meander is corrected to some extent, but the sensor that continuously detects the web edge It requires a large device that moves while controlling the position of the cross guider in the width direction, and is not suitable for parts where there is little space in the process, such as the lamination process and vapor deposition process, as well as in the vicinity of the high-temperature laminate part. In high temperature range, the heat resistance of the sensor and control device is insufficient, making it difficult to use.

Further, as another meandering prevention technique using a cross guider, a technique as disclosed in Patent Document 3 is disclosed. Patent Document 3 does not correct the meandering generated by the cross guider, but independently controls the inclination and the surface pressure of the left and right pinch rollers of the cross guider by feeding back the web position detection of the meandering web. This is what we are trying to prevent.
At this time, similarly to Patent Document 2, there is a problem that the sensor and the control device cannot be used in the high temperature part.

  In addition, in the meandering prevention technique of Patent Document 3, a strong widening is not required as in the heating process, and according to the knowledge of the present inventor, the cross guider in such a case generates meandering with respect to the web of the cross guider itself. It is not necessary to consider the right and left narrow pressure widths because the characteristics that are easy to cause are difficult to develop. Therefore, Patent Document 3 seems to be a technique for correcting what the web itself meanders to some extent from the upstream with a cross guider.

  On the other hand, Patent Document 4 is disclosed as an example in which a cross guider is used to correct web curl. This utilizes the web width tension generated by the cross guider for curl correction. The cross guider has the idea of supplementing the ease of meandering with a separately provided web guide.

  In Patent Document 4, the widening force is determined only by the coefficient of friction and the surface pressure of the cross guider, and the length of the cross guider is irrelevant. It is necessary to consider. Without doing this, the web guide roller or heel is pressed against the end of the web, and if the web position is constrained, the thin end of the thin web will break and the web will be processed by a laminator or vapor deposition. Is unsuitable.

In addition to the above, a technique as disclosed in Patent Document 5 is disclosed as a wrinkle stretching device for a web that is very similar to a cross guider. This is because the web is in contact with the web from the lower side and has a conveyance roller having the same rotation direction as the web conveyance direction, and pinch rollers are arranged at both ends of the web so as to narrowly press the web with the conveyance roller from the upper side of the web. The web conveyance direction and the pinch roller rotation direction have an angle so as to widen the width.
However, according to the knowledge of the inventors of the present application, there is a problem that meandering may occur depending on the balance of each frictional force because the rotation direction of the lower conveyance roller and the rotation direction of the upper pinch roller are different. In addition, since the width of the nip roller is as narrow as 2 to 3 mm, it is difficult to use when a strong widening force is required.
JP 2003-1754 A JP 2006-264879 A JP 2000-263660 A JP 2000-118815 A JP-A-4-106062

  As described above, in the conventional technology, in the web roll manufacturing process including the step of heating the web, there is no technology for avoiding the meandering of the web while performing strong widening in preventing the thermal wrinkling of the web. It was.

  The objective of this invention is providing the manufacturing method of the web roll which does not produce wrinkles and meandering in the manufacturing process of a web roll including the process of heating a web, but can surface-process a web stably.

  In order to achieve the above-mentioned object, according to the present invention, in the method of manufacturing a web roll having a step of heating the web and then a step of winding the web into a roll, A pair of gripping both ends in the width direction of the web, wherein the web is composed of a pair of roller groups sandwiched, and the outer peripheral portion of the at least one roller of the group of rollers is in contact with the web over the entire length in the axial direction. The cross guider provides a method for producing a web roll having a strain imparting step for imparting strain to the web in advance and a step for heating the web immediately thereafter.

  Moreover, according to the preferable form of this invention, the manufacturing method of the web roll which makes the magnitude | size of the said distortion the quantity corresponded to the thermal expansion which arises in the said heating process is provided.

  Also, according to a preferred embodiment of the present invention, the narrow pressure width wn in the web conveyance direction in which the roller group compresses the web, the direction of the rotation vector of the portion in contact with the web of the roller group, and the web conveyance direction A web roll manufacturing method is provided in which the relationship between the angle θ and the angle is within the range of the following equation.

α × ΔT <2 × wn × cos θ × sin θ / B <1.8 × α × ΔT
here,
α: Thermal expansion coefficient of the web ΔT: Temperature difference generated in the web wn: Length of the web conveyance direction in which the roller group in the cross guider narrows the web θ: Direction of the rotation vector of the portion of the roller group in contact with the web and web conveyance Angle B with direction B: represents the width of the web.

  Further, according to a preferred embodiment of the present invention, there is provided a web roll manufacturing method using a roller having a length in which an outer diameter portion of the roller extends outside a web end portion as the other roller of the roller group. Is done.

  Moreover, according to the preferable form of this invention, the manufacturing method of the web roll which uses the press means which consists of a spring as a means to narrow the said roller group to the said web is provided.

  Moreover, according to the preferable form of this invention, the manufacturing method of the web roll which uses what is a fluoro rubber or silicone rubber as a material of the outer peripheral part of the at least one roller of the said roller group is provided.

  According to a preferred embodiment of the present invention, the step of heating the web includes a vapor deposition step of depositing a metal film on the surface of the web using the web as a base material, or a high temperature laminate for bonding homogeneous or heterogeneous webs together A method for producing a web roll which is any of the steps is provided.

  First, in the present invention, the “step of heating the web” means contacting (for example, a heating roller) or non-contact (for example, contact of an infrared heater or a high-temperature fluid) with the conveyed web in order to perform surface processing or heat treatment on the web. ) And the like, a process in which the temperature of the web rises. For example, it is a process such as high temperature lamination or vapor deposition.

  In the present invention, the “web” is not particularly limited, such as paper, film, and thin metal foil, but a plastic film or metal foil is preferable. Examples of the film include polyester films such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate, polyolefin films such as polyethylene and polypropylene, and polyamide films such as nylon 6, nylon 66, nylon 12, and aromatic nylon. Films and other plastic films made of polyimide, polysulfone, polyvinyl, polyester ether, polycarbonate, polyphenylene sulfide, polylactic acid, cellulose, acrylic, and the like are used. Of course, a mixture or copolymer of these resins may be used. Various additives such as antistatic agents, weathering agents, inorganic or organic particles, lubricants such as wax, and pigments may also be included. Among them, it is effective for heat resistant films such as polyethylene terephthalate film, polyamide film, aramid or polyimide film. On the other hand, the metal foil is also effective for copper and aluminum.

  In the present invention, the “step of winding the web into a roll” means a step of winding the web while applying a tension around the cylindrical core having the same width as or slightly longer than the width of the web.

  Further, in the present invention, the “upstream side” refers to a side close to the web supply source when the web conveyance direction is considered.

  In the present invention, the “cross guider” refers to a means for causing the web to widen by rotating a pair of inclined rollers toward the web end at both ends of the web and narrowing the web. The inclined roller group includes an upper roller and a lower roller, and the axes of the upper roller and the lower roller are parallel.

  Further, in the present invention, the state that “the outer peripheral portion in contact with the web of at least one roller of the roller group is in contact with the web over the entire length in the axial direction” means that the roller group is in contact with the front and back of the web. However, it means a state in which the outer end portion of the outer diameter portion that is in contact with the web of the roller that is in contact with either one of the front and back sides is always present inside the end of the web.

  In the present invention, “the amount corresponding to the thermal expansion generated in the heating process” means that the thermal expansion coefficient of the web is α, and the temperature difference generated in the web is ΔT, which is a strain represented by α × ΔT. Say quantity. The temperature difference ΔT generated in the web is a value obtained by subtracting the temperature in the process before the web is heated from the temperature raised in the process in which the web is heated.

  According to the present invention, as will be described below, for example, a web subjected to surface processing with heat can be carried into a heat process without wrinkles or meandering. A quality web roll can be produced.

  Embodiments of the present invention will be described in detail below, but the present invention is not limited to the embodiments including the following examples, can achieve the objects of the invention, and does not depart from the gist of the invention. Various changes within the scope are naturally possible.

  An example of an embodiment of the present invention will be described with reference to the drawings, taking as an example the case of applying to a web roll manufacturing process having a high temperature laminating process between webs.

  FIG. 1 is a schematic plan view when a cross guider according to an embodiment of the present invention is applied to a web roll manufacturing apparatus having a laminating process. FIG. 2 is a schematic front view of FIG. FIG. 3 is a schematic side view in which only the cross guider is enlarged, and is a view taken in the direction of arrow A in FIG.

  The “cross guider” in this embodiment will be described in detail. Each of the rotation vectors of a portion of the roller group that is in contact with the web in the web conveyance direction is formed by a pair of roller groups sandwiching the widthwise end of the web from the front and back. On the other hand, it inclines so that it may face each end part side. Each of the left and right roller groups is composed of an upper roller and a lower roller, and the shafts of the upper roller and the lower roller are arranged in parallel. The web is sandwiched between the upper roller and the lower roller, and the web is widened by the inclination. At this time, a pressing means is provided for the roller group to sandwich the web. The pressing means refers to means for pressing an object against another object, and for example, a pneumatic cylinder, a motor, a screw, a weight, a spring, or a combination thereof can be used. Alternatively, the upper roller may be connected to the lower roller by a linear guide, and may be brought into contact with the lower roller using its own weight.

  The web W is transported from the direction of the transport roller 2 in the transport direction Y, is tensioned in the width direction by the cross guider 1, and is transported to the heating step 3. In FIG. 1 and FIG. 2, the heating process 3 is illustrated by taking a high temperature laminating process as an example. In this case, the web W is heated and laminated by the laminating rollers 9 and 9 'heated to a high temperature. In many cases, the lower surface of the web W is uniformly coated with an adhesive that develops an adhesive force when heated, and is pressed while being heated by the laminating rollers 9 and 9 ′ that are the heating step 3. It is pasted with another web 10 for pasting. The high temperature laminating rollers 9 and 9 ′ may be those having a heat medium flowing therein, those using induction heating, or those heated by a radiant heater from the back side of the laminating roller. In the present embodiment, the high temperature laminating process is shown, but in addition to this, the heating process 3 may be an oven or a vapor deposition process.

  In FIG. 1, the cross guider 1 is installed immediately before the upstream side of the heating process 3 of the web W. In FIG. 3, the cross guider 1 includes a pair of roller groups 4 and 4 ′ at both ends in the width direction of the web W. Each of the roller groups 4 and 4 'includes a pair of pressure contact rollers 12 and a receiving roller 15 so as to sandwich the web W from the front and back sides. As the pressing means 8 and 8 'for pressing the rollers against each other and narrowing the web, for example, a pneumatic cylinder or the like can be used, but the periphery of the laminating roller is often very hot and has heat resistance. It is necessary to consider use, insulation and cooling. Therefore, the spring as shown in FIG. 3 is preferably used because it can be used even at high temperatures. In this case, the pressing means obtains a surface pressure when the roller groups 4, 4 ′ narrow the web W by the restoring force of the spring. In the example of FIG. 3, the screw 14 is provided to separate the roller groups 4 and 4 ′ and release the narrow pressure of the web W. This can also be used in a high temperature atmosphere having a heating step. In addition to the spring, the pressure roller 12 and the receiving roller 15 may be connected by a linear guide, and the web W may be narrowed by utilizing the gravity of the pressure roller 12 or the weight attached to the pressure roller.

  Further, the rotation vector at the portion where the roller groups 4 and 4 ′ are in contact with the web W is inclined by θ with respect to the conveyance direction Y of the web W as shown in FIG. 1. The web W is widened in the width direction by rotating a pair of the inclined roller group 4 for narrowing the web W at one end of the web W and the other inclined roller group 4 ′ for narrowing the web W at the other end of the web W. Then, the web W is distorted.

  At this time, the pressure roller 12 and the receiving roller 15 have the same rotation vector in the portion in contact with the web W. As a result, there is no possibility of meandering due to the frictional balance being lost on the front and back of the web W.

  The “narrow pressure width wn in the web conveyance direction in which the roller group in the cross guider narrows the web” refers to a value obtained by projecting the length of the roller group in contact with the web in the web conveyance direction.

  The “temperature difference ΔT generated in the web” refers to a value obtained by subtracting the temperature in the process before the web is heated from the temperature raised in the process in which the web is heated.

  Further, “α × ΔT” in Equation 1 refers to a strain corresponding to a thermal expansion strain assumed to be generated by heating or a web strain due to thermal expansion. The meaning of “wn × cos θ × sin θ / B” in Equation 1 will be described. As described above, when the length in the web conveyance direction in which the roller group in the cross guider presses the web is wn, the distance traveled while the roller group and the web are in contact is wn. Since the roller group is inclined by θ with respect to the web conveyance direction, the amount of displacement in the web width direction is wn × cos θ × sin θ on one side. Since the distortion caused by this displacement is doubled on both sides and divided by the width B, it becomes “2 × wn × cos θ × sin θ / B”. In the present embodiment, the following effect is obtained by the relationship between the strain generated in the web by the cross guider and the strain of the web due to the thermal expansion or the thermal expansion strain assumed to be generated by heating, as expressed by Equation 1. Is disclosed.

  Here, there is a preferable range for an angle θ (referred to as an inclination angle θ for the sake of simplicity) between a rotation vector of a portion of the roller group that contacts the web W and the web conveyance direction. For example, if θ is 0 rad, the force of the roller groups 4 and 4 ′ to widen the web W in the width direction is zero, and if θ is π / 2 rad, the rotation direction of the roller groups 4 and 4 ′ and the web W Since the conveyance directions are orthogonal to each other, it is difficult for the roller groups 4 and 4 ′ to rotate, rather than widening the web W. The widening force is maximized at θ = π / 4 rad. As described above, the strain generated in the web W by the cross guider 1 is 2 × wn × cos θ × sin θ / B, and when this strain is differentiated by θ, θ is the strain, that is, the widening force is maximized. Angle, and θ = π / 4 rad. However, if θ is large, rubbing occurs due to the difference between the web conveyance direction and the rotation direction of the rollers 4 and 4 ′, and the wear of the contact portions of the roll groups 4 and 4 ′ with the web W becomes severe and narrow. Since the local distortion of the web W at the pressing portion becomes too large, about θ = π / 90 to π / 4 rad is preferable.

  Here, it should be noted that if the frictional force due to the surface pressure when the cross guider 1 narrows the web W is insufficient, the strain corresponding to the thermal expansion generated in the heating process is 2 × wn × cos θ ×. Only sin θ / B does not occur. The necessary widening force to be applied to the web W is obtained by multiplying the strain by the longitudinal elastic modulus and the area (= web thickness × wn) of the web W, so that the product of the friction coefficient and the surface pressure becomes larger than this. Select roller material and surface pressure.

  The receiving roller 15 and the pressure contact roller 12 are driven by the web W, that is, may be driven, or driving means such as a motor may be used. When rotationally driven by a motor or the like, it is preferable to take into consideration that the rotational direction component of the roller group 4, 4 ′ is substantially the same as the web W conveyance speed. In any case, the outer diameter part contacting the pressure contact roller 12 and the receiving roller 15 web is rotatably supported by the bearing, and the bearing is engaged with the shaft 13. The shaft 13 is connected and supported by the pressing means 8.

  In this embodiment, at least one of the pressure rollers 12 or the receiving rollers 15 of the roller groups 4 and 4 ′, for example, the axial direction of a portion having the same diameter as the outer diameter portion where the pressure roller 12 and the web W abut on each other. The length L1 and the length w in contact with the web W are equal. That is, the position where the pressure roller 12 and the receiving roller 15 narrowly press the web W needs to be inside the end of the web W. This is because, as shown in FIG. 4, for example, when the outer diameter portion of the pressure roller where the pressure roller 12 and the web W abut is outside the end of the web W, the distortion corresponding to the thermal expansion immediately before the heating process appears. When the narrow width w of the web W becomes unequal at both ends of the web when a very strong widening is required, the traction force of one roller group 4 continues to increase, and the other roller group 4 ′ The present inventors have found that the traction force of the web continues to decrease, causing the web to meander. That is, by making the narrow pressure widths w at both ends of the web W equal to each other, meandering that tends to occur when a strong widening is performed with a cross guider immediately before the heating step can be prevented. At this time, the surface pressure and the angle θ of the roller groups 4 and 4 ′ are preferably equalized in advance at both ends of the web W. Accordingly, by arranging the roller groups 4 and 4 'as in the present embodiment, the web W can be prevented from being meandering without requiring a large meandering correction mechanism, and as a result, wrinkles due to thermal expansion can be achieved even in a high-temperature heating process. It became possible to avoid.

  Further, in order to make the above-described narrow pressure width w equal at both ends of the web W, the outer diameter portions of both the pressure roller 12 and the receiving roller 15 are inside the end of the web W as shown in FIG. Can be achieved. However, particularly in the case of a thin web W, since it may be broken at the end of the roller group 4 as shown in FIG. 5, it is preferable that either one of the rollers, for example, the receiving roller 15 and the web W is contacted as shown in FIG. What is necessary is just to lengthen the length L2 of the receiving roller 15 so that the outer diameter part which touches may be outside the edge of the web W. As long as the end of the pressure roller 12 is located inside the end of the web W, the width w for narrowing the web W is determined by the length L1 of the pressure roller 12, so that when the width is widened just before the heating step, thermal expansion is performed. Even when a strong distortion corresponding to the above is applied, the web can be widened while preventing meandering of the web without requiring a large-scale device such as a sensor.

  Various industrial materials can be used as the material of the portions of the pressure roller 12 and the receiving roller 15 that come into contact with the web W. However, heat resistance is required when used in a web roll manufacturing process having the heating process 3. For example, it is possible to use steel or something with a plating on it. More preferably, in order to obtain a frictional force sufficient for the cross guider 1 to widen the web W, the material of the outer diameter portion of one of the rollers in the roller group 4 is preferably rubber, and more preferably heat resistant. Fluorine rubber, silicone rubber, or those coated or coated with a heat-resistant material such as fluorine can be used.

  In order to avoid wrinkles and voids due to thermal expansion that occurs in the heating step 3, it is sufficient to widen just before that, but the present inventors apply to the web just before the heating step to prevent wrinkles and voids. It has been found that the strain to be changed may vary depending on the physical property value and dimensions of the web. The physical property value is the thermal expansion coefficient α of the web W, and the dimension is the narrow pressure width wn in the web conveyance direction and the width B of the web W in which the rollers in the cross guider constrict the web.

As described above, the strain in the width direction generated in the web W by the cross guider 1 is 2 × wn × cos θ × sin θ / B. If the web W is larger than the thermal expansion strain α × ΔT generated in the heating step 3, wrinkles and voids can be avoided,
α × ΔT <2 × wn × cos θ × sin θ / B <1.8 × α × ΔT
The width of the pressure roller 12 and the inclination angle θ are determined so as to be in the above range. When the strain 2 × wn × cos θ × sin θ / B generated in the web W by the cross guider 1 is less than α × ΔT, the strain generated in the heating process 3 is larger than the strain widened by the cross guider, and thermal expansion is caused. Causes wrinkles and voids. Further, when the strain in the width direction 2 × wn × cos θ × sin θ / B generated in the web W is larger than 1.8 × α × ΔT, the web W is excessively strained, and the web W is caused by permanent strain or lateral strain. Processing spots occur. Thus, in order to avoid thermal expansion wrinkles, a strong widening force is required, and a cross guider that can generate a strong widening force is suitable, and according to the present invention, a cross guider that is unlikely to meander in a high temperature atmosphere is provided. ing.

  The thermal expansion coefficient α can be obtained in advance as the elongation of the web W to be manufactured divided by the heat divided by the length of the reference temperature and the temperature difference. The temperature difference ΔT described above is a heating process in which the temperature immediately before the heating process 3, for example, the surface temperature of the web W at an arbitrary point upstream of the cross guider 1 is measured in the same manner as the infrared thermometer. It can obtain | require from the difference with the temperature of the web W in. As for the temperature of the web W, a non-contact thermometer using infrared rays may be used. In addition, it is preferable that the measurement of the web W takes the average of the value measured at several points in the width direction. For example, the temperature of five points is measured at predetermined intervals in the width direction of the web W, and the average value is taken. When the heating process 3 is a high-temperature laminating process as shown in FIG. 2, it is difficult to directly know the temperature of the web W in the heating process 3, so in this case, the surface temperature of the laminating rollers 9 and 9 ′ may be substituted. good.

  Here, the conveyance roller 2 may be any one that conveys the web W in the direction of the arrow while supporting the web W, and may be driven or driven. The material and roughness of the surface are not particularly limited, but can generally be selected appropriately from rubber, resin, and metal. However, in many cases, it is better not to select a product that scratches the surface of the product web W or peels off the adhesive layer 11.

  The web W that has undergone the heating step 3 is wound into a roll shape on a winding core by appropriately cutting the web W to a predetermined width. At this time, the web W is appropriately transported and wound by controlling the speed and tension by a transport roller and a core support device.

  The embodiment of the present invention has been described above. For example, in the laminating apparatus shown in FIG. 2, the web width-developing apparatus of the present invention is applied not only to the web W but also to the other web 10 to be bonded. Of course it is also possible.

[Example 1]
The result of having evaluated the performance by applying the web tentering apparatus according to one embodiment of the present invention to the laminator apparatus will be described.

  As the web W, a polyimide film (“Kapton” manufactured by Toray DuPont Co., Ltd.) having a thickness of 100 μm and a width of 600 mm is used. Its thermal expansion coefficient α is 21 ppm / ° C., and an adhesive is applied to its lower surface. The laminating roller is a metal roller having a surface length of 1000 mm and a diameter of 800 mm, and its surface temperature is set to 300 ° C. The polyimide film and a copper foil having a thickness of 100 μm and a width B = 600 mm were narrowed and laminated with the two laminating rollers. The conveyance speed was 5 m / min. The inclination angles of the roller groups 4, 4 ′ of the cross guider 1 were θ = π / 12 rad (= 15 °) at both ends of the polyimide film.

  Here, in order to apply tension in the width direction of the web W, the cross guider 1 shown in FIGS. In the cross guider shown in FIG. 3, the receiving roller 15 has a diameter of 50 mm, a longitudinal length L2 = 60 mm, and is a driven rotating roller whose surface is made of stainless steel. On the other hand, the pressure roller 12 is a driven rotating roller having a diameter of 50 mm and a longitudinal length L1 = 40 mm and having a surface made of silicone rubber. The pressure roller 12 is pressed by a spring as shown in FIG. A pressing means is provided. Further, the outer diameter portion of the pressure roller 12 that contacts the polyimide film W is in contact with the polyimide film over the entire length in the axial direction, and the end of the outer diameter portion of the roller 12 that contacts the polyimide film is the end of the polyimide film. It is located from the center of the 5 mm polyimide film.

  The temperature of the polyimide film W immediately before the upstream side of the cross guider 1 was 50 degrees, and thus ΔT = 300−50 = 250 ° C. The thermal strain generated thereby is α × ΔT = 0.5%. The web conveyance direction length wn in which the roller group in the cross guider narrows the web is wn = 10 mm since w = L1 multiplied by sin θ. Therefore, the distortion in the width direction of the polyimide film caused by the widening of the cross guider is 2 × wn × cos θ × sin θ / B = 0.8%.

  Evaluation is first performed in the void state of the web after lamination (one obtained by bonding a polyimide film and a copper foil). The case where no void was generated was rated as ◎, the case where an extremely mild void was present as ○, the case where a mild void was generated as Δ, and the case where a void which did not become a product was evaluated as x.

Further, the meandering state of the polyimide film was 0.1 mm or less for 、, 0.5 mm or less for ◯, less than 1 mm for Δ, and 1 mm or more for x. The results are shown in Table 1.
[Example 2]
Except for the following points, the configuration was exactly the same as in Example 1, and evaluation was performed in the same manner as in Example 1.
The length L1 of the pressure roller 12 in the longitudinal direction was set to 20 mm, and thus the strain in the width direction generated in the polyimide film was set to 2 × wn × cos θ × sin θ / B = 0.4%.
Example 3
Except for the following points, the configuration was exactly the same as in Example 2, and evaluation was performed in the same manner as in Example 1.

As a pressing means, a pneumatic cylinder was adopted instead of a spring.
[Comparative Example 1]
Except for the following points, the configuration was exactly the same as in Example 2, and evaluation was performed in the same manner as in Example 1.

As shown in FIG. 4, each of the pair of roller groups of the cross guider has such a length that the outer diameter portion that comes into contact with the web extends to the outside from the web end portion. A pressure cylinder is used as the pressing means.
[Comparative Example 2]
Here, in place of the above-mentioned cross guider, the widening means shown in FIG. 7 is disposed immediately upstream of the high temperature laminating process. At this time, the inclination θ of the pressure rollers 12, 12 ′ was the same as in the example. In addition, the width of the outer diameter portion of the pressure contact rollers 12 and 12 ′ that is in contact with the polyimide film W is 3 mm. A pressure cylinder was used as a pressing means when pressing the pressure rollers 12 and 12 ′ against the conveying roller 2. The material of the pressure rollers 12, 12 ′ was silicone rubber.

  When the positional relationship between the cross guider and the web is as in Comparative Example 1, a difference occurs in the pulling force of the cross guider at both ends of the web, resulting in meandering.

  Further, when the narrow inclined pressure contact roller is arranged on the conveying roller as in Comparative Example 2, not only the web is meandered due to the balance of the frictional force between the rollers, but also the traction force of the pressure contact roller is insufficient and sufficient widening is achieved. As a result of no force being applied to the web, voids could not be suppressed.

  On the other hand, in the above embodiment, by applying the web roll manufacturing method of the present invention to the high temperature laminating process, it is generated in the cross guider while suppressing the wrinkle of the thermal expansion caused by the cross guider even in the high temperature atmosphere having the heating process. It is possible to prevent meandering that tends to occur. In addition, by giving a strain larger than the strain corresponding to the thermal expansion strain generated in the web in the heating process in advance by the cross guider immediately before the upstream side of the heating step, the generation of wrinkles due to the thermal expansion is prevented. Then, generation | occurrence | production of the void by wrinkles can be suppressed completely. In addition, by using a spring pressing means for the present cross guider, a web can be manufactured stably over a long period even in a high temperature atmosphere.

  The present invention can be used as a method for manufacturing a web roll including a heating process, and is particularly suitable for a method for manufacturing a web roll including a laminating apparatus. be able to. Further, the application range is not limited to these.

It is a schematic plan view at the time of applying the cross guider which concerns on one Embodiment of this invention to the manufacturing apparatus of the web roll which has a lamination process. It is a schematic sectional drawing of FIG. It is a schematic sectional drawing of the edge part holding | gripping apparatus of the web which concerns on one Embodiment of this invention. It is a schematic sectional drawing of the edge part holding | grip apparatus of the web which concerns on embodiment of a prior art. It is a schematic sectional drawing of the edge part holding | grip apparatus of the web which concerns on another embodiment of this invention. It is a schematic plan view of the web conveyance process using the cross guider which concerns on embodiment of a prior art. It is a schematic perspective view of the web widening apparatus which concerns on embodiment of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cross guider 2 Conveying roller 3 Heating process 4, 4 'A pair of roller group 8, 8' Pressing means 9, 9 'Laminating roller 10 Laminating web 11 Adhesive 12, 12' Pressing roller 13 Shaft 14 Screw 15 Receiving roller 16 Spring 18 Frame 19 Pneumatic cylinder 20 Guide means 21 Winding step 22 Web roll 23 Winding core 24 Winding tension applying means W Web θ Angle of the web edge gripping device with respect to the web width direction w A group of rollers in the cross guider narrows the web Narrow pressure width in the axial direction of the roller group wn Narrow pressure width in the web conveying direction in which the roller group in the cross guider narrows the web L1 The portion where the diameter of the pressure roller and the web is the same as the outer diameter part of the contact Length in the axial direction L2 Length in the axial direction of the part where the receiving roller and the web have the same diameter as the outer diameter part of the contact

Claims (7)

In a method of manufacturing a web roll having a step of heating a web and a step of winding the web into a roll thereafter, each of the roller groups is composed of a pair of roller groups sandwiching the widthwise ends of the web from the front and back, and at least one of the roller groups Strain imparting that preliminarily imparts strain to the web by a set of cross guiders configured to grip both ends of the web in the width direction is configured such that the outer peripheral portion of the roller in contact with the web is in contact with the web over the entire length in the axial direction. The manufacturing method of the web roll characterized by having the process and the process of heating the said web immediately after. The method for producing a web roll according to claim 1, wherein the magnitude of the strain is an amount corresponding to thermal expansion generated in the heating step. The relationship between the narrow pressure width wn in the web conveyance direction in which the roller group narrows the web, and the angle θ formed by the direction of the rotation vector of the portion in contact with the web of the roller group and the web conveyance direction is expressed by the following equation: The method for producing a web roll according to claim 2, wherein the web roll is in the range.
α × ΔT <2 × wn × cos θ × sin θ / B <1.8 × α × ΔT
here,
α: Thermal expansion coefficient of the web ΔT: Temperature difference generated in the web wn: Length of the web conveyance direction in which the roller group in the cross guider narrows the web θ: Direction of the rotation vector of the portion of the roller group in contact with the web and web conveyance Angle B with direction B: represents the width of the web. The web roll according to any one of claims 1 to 3, wherein a roller having a length in which an outer diameter portion of the roller extends to an outside of a web end portion is used as the other roller of the roller group. Manufacturing method. The method for producing a web roll according to any one of claims 1 to 4, wherein pressing means comprising a spring is used as means for narrowing the roller group to the web. The method for producing a web roll according to any one of claims 1 to 5, wherein a material made of fluoro rubber or silicone rubber is used as a material of an outer peripheral portion of at least one roller of the roller group. The step of heating the web is either a vapor deposition step of depositing a metal film on the surface of the web using the web as a base material, or a high-temperature laminating step of bonding homogenous or heterogeneous webs together. The manufacturing method of the web roll in any one of Claims 1-6.

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