JP5666345B2 - Apparatus and method for manufacturing resin-coated substrate - Google Patents

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for manufacturing a resin-coated substrate in which a substrate is coated with a resin film by melting the resin and extruding it from a die and sandwiching the extruded molten resin and the substrate with a pair of laminate rolls. It is about.

  When the resin is melted and extruded from a die, and the extruded molten resin and the substrate are sandwiched between a pair of laminating rolls to produce a resin-coated substrate (extruded laminate) in which the substrate is coated with a resin coating (so-called extrusion) Laminate molding), the molten resin extruded from the die outlet is subjected to elongational flow deformation that forms its shape on the free surface in the space (air gap) to the nip clamping part of the pair of laminate rolls below it It is generally known to receive. In this elongation and flow deformation, the molten resin often shows a narrowing behavior called neck-in. It is known that due to this neck-in, the end of the resin film becomes relatively thicker than the center.

  This resin-coated neck-in will be described in more detail. This is the period from when the molten resin extruded from the die outlet reaches a pair of laminate rolls, where it is sandwiched with the substrate and cooled and solidified. Occurs. Strictly speaking, the occurrence of this neck-in is caused by the difference in the flow form of the molten resin as follows.

  That is, in the flow form of the molten resin, the central part of the resin film (part to be a product), which is a fixed part, becomes a plane elongation flow, and force acts not only in the longitudinal direction but also in the width direction.

  On the other hand, the flow form at both ends of the resin coating is a uniaxial extension flow that freely shrinks, but in addition to this, the neck-in is affected by the force of the flow in the width direction of the plane extension flow at the center of the resin coating. Arise. Due to the occurrence of this neck-in, a distribution of thickness occurs in the width direction of the resin film, and both ends of the resin film shrink freely, resulting in a portion that becomes thick at both ends.

  Further, both end portions of the resin coating may be thinned by receiving pressure from both at the boundary between the uniaxial extension flow and the central plane extension flow.

  As described above, since the end of the resin film becomes relatively thick as compared with the central portion due to the neck-in, the substrate is laminated with the coating resin having a uniform thickness in the conventional manufacturing apparatus. In order to manufacture a resin-coated metal plate, the exit width of the die or mold had to be set to a considerably larger dimension than the metal plate to be resin-coated. As the neck-in amount increases, the thickness of both ends of the molded resin film also increases, and the amount of resin to be trimmed increases, which further promotes a decrease in resin utilization efficiency. .

  When a resin-coated substrate is produced by extrusion lamination, an air gap is generally formed in the space between the die or mold outlet and the nip position of the laminate roll. In extrusion laminating, a pair of laminating rolls are used, and a metal substrate is supplied in addition to molten resin at the nip position of the laminating roll. There is a limit to shortening the gap.

  By the way, when the air gap is long, a film fluctuation phenomenon called draw resonance occurs, and this phenomenon causes the neck-in amount to change periodically, and the thickness of the coating resin also changes periodically to reduce the film thickness. There is also the problem of uniformity. In particular, it is generally known that this film fluctuation phenomenon becomes remarkable when the laminating speed is increased. It is also known that this film fluctuation phenomenon is likely to occur when the draw ratio (die exit gap / coating resin thickness) is large.

  Here, to turn to the conventional open technology, Patent Literature 1 discloses a technology in which high-pressure gas is blown to both ends of the melt film in the air gap as a technique for suppressing the neck-in of the melt film and preventing the film from shaking. It is disclosed. However, because this technology uses the dynamic pressure of high-pressure gas, it is difficult to adjust the blowing direction and amount of high-pressure gas, and there is a danger that film sway is induced and promoted by the blown-out gas. There is.

  On the other hand, Patent Document 2 discloses a technique for sucking both ends of a melt film in an air gap. However, this technique requires adjustment of the suction force so as to balance the force with which the molten resin necks in, and lacks stability against disturbances such as air pressure and turbulence around the laminate. That is, once the balance is lost, the neck-in prevention effect is lost, and the apparatus needs to be adjusted again, resulting in an increase in the loss of the metal substrate and the resin.

  The techniques disclosed in Patent Documents 1 and 2 do not actively shorten the air gap, but how to suppress the neck-in while allowing a long air gap. Is.

  Furthermore, Patent Document 3 discloses a technique in which a pre-roll is disposed between a die or mold outlet and a laminate roll. In this technology, a metal cooling roll called a pre-roll is arranged in the air gap, the molten resin film is first received by the pre-roll, and then supplied to the laminating roll, thereby suppressing excessive neck-in and preventing film shaking. Is. In this technique, a molten resin film is once cooled by a pre-roll to form a semi-molten resin film, and this semi-molten resin film is supplied to a laminate roll.

  The technology using this pre-roll is most practical in a geometrically limited space through which a molten resin film or a metal substrate passes through a manufacturing apparatus consisting of a die or mold and a pair of laminate rolls. This is one of the methods. However, even when the technique disclosed in Patent Document 3 is applied, it has been specified by the present inventors that neck-in still occurs greatly from the exit of the die or mold to the pre-roll. This is largely due to the long spatial distance between the die exit and the pre-roll.

  Here, a conventional extrusion laminating apparatus will be described with reference to FIG. The extrusion laminating apparatus shown in the figure includes two sets of extruders E, a die D communicating therewith, pre-rolls PR1 and PR2 disposed below an outlet D ′ of each die D, and a pair of laminating rolls CR1 and CR2. It is roughly composed of The molten resin fl is extruded downward from the outlet D ′ of both dies D, and comes into contact with the pre-rolls PR1 and PR2 that are freely rotatable (X1 direction, X1 ′ direction) below the outlet D ′ to be in a semi-molten state 2 The resin of the layer is integrated so as to sandwich the metallic substrate BP conveyed downward (Y direction) between the two sets of dies D, and these are sandwiched by a pair of laminate rolls CR1 and CR2, and are semi-molten The resin in the state is cooled and solidified on the surface of the substrate BP, thereby manufacturing a resin-coated substrate in which the substrate BP is coated with the resin coatings FL and FL.

  As shown in the figure, by disposing the outlet D ′ of the die D above the vertices of the pre-rolls PR1 and PR2, the spatial distance: t between the outlet D ′ and the pre-rolls PR1 and PR2 can be shortened. However, since the molten resin fl extruded from the outlet D ′ of the die D is actually drawn in the rotation direction of the pre-rolls PR1 and PR2, in other words, due to the tension to be drawn in the tangential direction of the pre-rolls PR1 and PR2. Since the molten resin fl is drawn in an oblique direction inclined in the rotational direction from the vertically lower side, the actual air gap t1 (distance from the outlet D ′ to the contact points of the pre-rolls PR1 and PR2) of the molten resin fl becomes longer. Furthermore, by pulling the molten resin in an oblique direction in this way, so-called “meani” (resin deposit) tends to adhere to the exit of the die, and the surface of the coating resin has streak-like chipping and quality. It becomes the problem above.

  From this point of view, the die D is actually arranged with an inclination as shown in FIG. 13 in order to prevent the adhesion of the sealant to the die outlet while reducing the air gap as much as possible. The spatial distance t2 between the outlet D ′ and the pre-rolls PR1 and PR2 is made shorter than the spatial distance t1 shown in FIG.

  However, even if the die arrangement as shown in FIG. 13 is applied, there is still a limit to shortening the air gap t2 due to geometric restrictions due to the outer diameter of the pre-roll and the outer shape of the die. There is a trade-off relationship between shortening the time and suppressing the mean. For this reason, the space length t2 between the exit D 'of the die D and the pre-rolls PR1 and PR2 becomes long, and the current situation is that the increase in neck-in in this space is not completely suppressed.

  By the way, the temperature of the molten resin is controlled by the set temperature of the pre-roll. From the viewpoint of the adhesion between the substrate and the molten resin, it is preferable to keep the temperature of the molten resin at the nip position of the laminating roll at a high temperature, but if the temperature of the molten resin is too high, The amount of neck-in in the space length between the pre-roll and the space length (t2 in FIG. 13) and the space length between the pre-roll and the laminate roll (t3 in FIG. 13) increases. Accordingly, it is desirable that the space length t3 between the pre-roll and the laminate roll is also short, but in practice, this spatial distance is limited by the relationship between the laminate roll diameter and the pre-roll diameter.

  In order to shorten the space lengths t2 and t3 as much as possible, it is easy to understand that it is only necessary to reduce the outer diameter of the pre-roll. However, reducing the outer diameter of the pre-roll decreases the cooling capacity of the pre-roll. The molten resin temperature on the surface of the pre-roll becomes high. If the molten resin temperature is higher than necessary, the neck-in amount at the space lengths t2 and t3 becomes large. In addition, as the neck-in increases, the production speed must be limited due to the occurrence of film swaying, especially during high-speed lamination. Furthermore, if the outer diameter of the pre-roll is extremely small and its cooling capacity is greatly insufficient, the molten resin is fused to the pre-roll, and the provision to the laminate roll becomes impossible. Conversely, when the pre-roll diameter is increased, both the space lengths t2 and t3 have to be long, and it is inevitable that the neck-in increases.

  In this way, in the current extrusion laminate molding, the resin-coated substrate is produced by setting the exit width of the die or mold to be considerably larger than the width of the metal substrate, and therefore the amount of resin loss is large and the production speed is high. The reality is that it is restricted.

  As described above, by reducing the length (space distance) of the molten resin from the die exit until it contacts the surface of the pre-roll as much as possible, it has a high neck-in suppressing effect and effectively prevents film shaking. The development of a technology that can be suppressed, and can effectively suppress the stagnation that is in a trade-off relationship with the suppression of neck-in is also eagerly desired in the art.

  Furthermore, development of a technique capable of accurately controlling the temperature of the molten resin over a wide range in order to ensure adhesion between the substrate and the resin film while suppressing neck-in is eagerly desired.

JP 2000-37840 A JP 2000-37841 A JP 2001-121647 A

  The present invention has been made in view of the above-described problems, and is a resin in which a resin film is coated on the surface of a substrate by sandwiching a molten resin together with the substrate at a nip clamping portion of a pair of laminate rolls and cooling and solidifying the resin. Manufacturing apparatus and manufacturing method for manufacturing a coated substrate: Production of a resin-coated substrate that is excellent in neck-in suppression effect and film sway suppression effect, and also in the suppression effect of maine in a trade-off relationship with neck-in suppression An object is to provide an apparatus and a manufacturing method.

  In order to achieve the above object, a resin-coated substrate manufacturing apparatus according to the present invention includes a molten resin extruded downward from an outlet opened on a lower end surface of a die, together with a metal substrate, positioned below the outlet. A resin-coated substrate manufacturing apparatus for manufacturing a resin-coated substrate that is sandwiched between a pair of rotating laminate rolls, cooled and solidified by melting a molten resin, and the surface of the substrate is coated with a resin film, A pre-roll is provided between the outlet and the laminating roll, and the molten resin extruded from the outlet is grounded to the pre-roll and then sent between a pair of laminating rolls. A fluid chamber for providing fluid to a space between the lower pre-rolls, the fluid chamber having an opposing surface facing the space and the pre-rolls Thus, the fluid provided from the fluid chamber tends to be taken up by the molten resin existing in the space being displaced in the rotation direction of the pre-roll while flowing in the fluid flow path along the facing surface toward the die. The fluid pressure is applied in the direction of pushing back.

  In the manufacturing apparatus of the present invention, a pre-roll is disposed between a die outlet and a pair of laminate rolls positioned below and sandwiching the molten resin, and pressure is applied to a space (air gap) between the die outlet and the pre-roll. It is equipped with a fluid chamber that provides fluid such as air, and the molten resin that is pushed out from the outlet and grounded to a rotatable pre-roll is pulled in the direction of rotation of the pre-roll and tries to deform in an oblique direction, for example. By pushing back by the pressure of the fluid provided in the space, the posture of the molten resin in the space, particularly in the vicinity of the die outlet, can be set to a posture extending vertically downward from the die outlet as much as possible. While effectively suppressing, the length of the molten resin in the space can be shortened as much as possible to suppress neck-in. Is a device capable of the resin film by coating to reduce the amount of loss of the resin may occur in the course of producing the resin coated substrate to a surface. That is, by arranging a pre-roll between the die outlet and the laminate roll, the air gap can be shortened, so that both neck-in and film shaking can be suppressed. By providing fluid from the chamber, the air gap can be further shortened by bending the attitude of the molten resin being conveyed in a non-contact state as desired, and film fluctuations caused by air turbulence and draw resonance can be avoided. It is a device that can suppress the adhesion of the main body.

  The fluid chamber has a facing surface facing the space and the pre-roll described above, and the fluid provided from the fluid chamber flows through the fluid flow path along the facing surface to the die side and is pushed into the space. The molten resin is provided from the space to the pre-roll through the fluid flow so as to follow the alignment of the opposing surface, and is in a semi-molten state on the pre-roll surface, for example. Neck-in is suppressed, and the resin in a semi-molten state is transported downward and is sandwiched between the nips of a pair of laminate rolls that rotate together with a separately transported metal substrate, and the molten resin is cooled and solidified. A resin-coated substrate is produced by coating the surface of the substrate with a resin film. When the pre-rolled molten resin is pulled in the rotational direction of the pre-roll, the fluid conforms to the shape of the opposing surface. By receiving fluid pressure from the fluid flowing through the flow path, the molten resin in the space can form an extending posture along the facing surface. There are two dies, each of which has a unique pre-roll under each die, and the molten resin extruded downward from the outlet of each die is grounded to the corresponding pre-roll, and then both molten resins attach the substrate It may be in the form of a device that is pinched between a pair of laminate rolls in a sandwiched posture.

  Here, it is preferable that the fluid chamber is provided with a first heating unit for heating the fluid to adjust its temperature and generating a fluid whose temperature is adjusted.

  Or it is preferable that the said pre-roll is provided with the 2nd heating part for heating-temperature-controlling this pre-roll.

  In extrusion lamination molding, the temperature of the molten resin at the time of clamping at the nip clamping part between the laminate rolls is important, but in order to increase the adhesion between the substrate and the resin film, the gap between the pre-roll and the pair of laminate rolls is important. It is desirable to raise the temperature of the molten resin within a range in which excessive neck-in does not occur in this space.

  In order to reduce the air gap, a measure to reduce the pre-roll diameter is preferable from the viewpoint of reducing geometric restrictions, but the cooling ability of the pre-roll is also reduced. Therefore, a first heating unit such as a heater is provided in the fluid chamber, and the temperature of the fluid provided from the fluid chamber to the space is adjusted by heating. By providing the resulting fluid to the molten resin passing through the space, the cooling amount of the molten resin grounded on the pre-roll surface can be adjusted as desired.

  Alternatively, a second heating unit such as a heater is provided on the pre-roll, and the molten resin grounded here is heated on the surface of the pre-roll whose temperature has been adjusted, so that the cooling amount of the molten resin is similarly adjusted as desired. be able to. As described above, when the temperature of the pre-roll and the temperature of the fluid provided from the fluid chamber are adjusted as desired, the temperature of the molten resin at the nip pressing portion causes the substrate and the resin film to adhere to each other with high adhesion. Therefore, it is possible to control the temperature so as to be necessary.

  Furthermore, it is preferable that a third heating unit is provided between the pre-roll and the pair of laminating rolls in a conveyance path that contacts the pre-roll and feeds the molten resin downward.

  By applying a fluid chamber between the die and the pre-roll, the neck-in of the space from the die outlet to the pre-roll can be suppressed, and film shaking can be prevented. At this time, the pressure of the fluid chamber increases the adhesion of the molten resin on the surface of the pre-roll, and the molten resin is easily cooled due to the cooling effect of the chamber fluid. In addition, as the molten resin is cooled, the neck-in suppressing effect is increased, the film shaking preventing effect is increased, and further, the laminating speed is improved. However, if the temperature of the molten resin is too low, there is a risk that the adhesion between the substrate to be laminated and the resin film will be reduced. In view of this, a third heating unit is provided in a space from the pre-roll to the nip pressing part of the pair of laminate rolls in order to guarantee the temperature of the molten resin at the nip pressing part. Examples of the third heating unit include a heater (including an IR heater) and an oven furnace.

  In addition, referring to the fluid chamber described above, the opposing surface has a first region having a shape complementary to the roll surface of the pre-roll, and the upper end of the fluid chamber bent from the first region to the outlet side of the die. The fluid flow path includes a first flow path between the first area and the molten resin on the roll surface, a second area and a lower area of the outlet. A fluid passage cross-sectional width of the first fluid passage that is continuous with the second fluid passage and is located upstream of the fluid flow. It is preferably narrower than the channel.

  According to the present inventors, the channel cross-sectional width of the first channel continuous to the second channel is narrowed (the channel cross-section of the second channel is the internal channel of the fluid chamber). Is narrowed in comparison with that of the second channel), so that a throttling effect of the fluid flowing through the second flow path corresponding to the second region is obtained, and the second flow path is a cross section of the flow path reaching the upper end of the fluid chamber. In the process of changing the width (the gap width from the facing surface to the pre-roll, more strictly, the gap width from the facing surface to the molten resin that is in close contact with the pre-roll and the fluid flows through) The molten resin can be given self-stability against change. For example, when the pressure of the fluid provided from the fluid chamber is constant, the molten resin moves in the direction of widening the cross-sectional width of the second flow channel due to disturbance (turbulence of the outside air, etc.). The flow rate from the fluid chamber increases due to the decrease in the flow path resistance of the flow path, and since the cross-sectional width of the first flow path is constant (the flow path resistance is constant), the pressure loss increases as the flow rate increases. The static pressure in the second flow path decreases and the second flow path of the molten resin returns to the direction of narrowing. On the other hand, when the molten resin moves in the direction of narrowing the channel cross-sectional width of the second channel, the flow rate from the fluid chamber decreases due to an increase in the channel resistance of the fluid channel, and the flow of the first channel Since the cross-sectional width is constant (the flow path resistance is constant), the pressure loss is reduced by the increase in flow velocity, the static pressure in the second flow path is increased, and the second flow path of the molten resin is widened. Return to the direction. Thus, in the process in which the channel cross-sectional width changes in the second channel, the molten resin has self-stability with respect to this change.

  The space from the end face on the outlet side of the die along the second flow path to grounding to the pre-roll as a result of the narrowing of the cross-sectional width of the first flow path that continues to the second flow path The extending posture of the molten resin inside is stabilized (restrained). Furthermore, it becomes possible to restrict | squeeze the flow volume which flows into a fluid flow path, and this can suppress a film | membrane shake.

  Here, as one embodiment, the channel resistance of the first channel is 0.3 times or more than the channel resistance of the second channel.

  Regarding the self-stability of the channel cross-sectional width of the second channel, the inlet (boundary with the first channel) and the outlet (second channel) of the second channel having channel resistance that fluctuates due to disturbance. Self-stability increases as the ratio of the static pressure difference between the inlet and outlet of the first channel having a constant channel resistance with respect to the difference in static pressure at the boundary of the fluid chamber and the upper end surface of the fluid chamber increases. That is, the larger the value of the channel resistance of the first channel / the channel resistance of the second channel in the steady state, the higher the self-stability of the second channel. That is, this ratio must be increased and adjusted so that at least the influence of the change in the static pressure is greater than the influence of the change in the radius of curvature. Further, the self-stability can be evaluated by the magnitude of the pressure change amount when the pressure change occurs and the magnitude of the flow rate change amount with respect to the change in the channel cross-sectional width of the second channel. When the flow resistance of the first flow path is increased with respect to the second flow path, the chamber original pressure increases when the required static pressure at the inlet of the second flow path is the same. When the channel cross-sectional width changes, the amount of change in the required static pressure is large, and the amount of change in the flow rate is small. Thus, the self-restoring force increases by increasing the channel resistance of the first channel.

The channel resistance of the first channel is preferably high, but in the relational expression between the flow rate and the pressure loss, the channel resistance is proportional to the channel length and inversely proportional to the cube of the channel cross-sectional width. If the channel length of the first channel is increased, the channel resistance increases, but the position where the molten resin is pressed against the pre-roll by the pressure in the fluid chamber is far from the die outlet. That is, the molten resin comes in contact with the pre-roll surface in close contact and is disadvantageous from the viewpoint of cooling and solidifying, and the neck-in amount increases. On the other hand, reducing the channel cross-sectional width is effective because the channel resistance increases to the third power. In the conventional apparatus for manufacturing a resin-coated substrate, the thickness of both end portions of the resin on the surface of the laminate roll is large, and the flow path cross-sectional width cannot be reduced. However, in the manufacturing apparatus of the present invention described above, the neck-in is small. Since the thickness increase at both end portions of the resin on the pre-roll surface and the laminate roll surface is reduced, the cross-sectional width of the flow path can be reduced. Regarding the dimension of the channel cross-sectional width (a ₁ ), it has been found that 1 mm or less is practically applied, and 0.5 mm or less is more preferable. In addition, the larger the value of the channel resistance of the first channel / the channel resistance of the second channel, the better. However, in practice it has been found that it is desirable to ensure 0.3 times or more. Yes.

  Further, in a preferred embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the upper end surface of the fluid chamber forms a flat surface, and the radius of curvature of the second region of the opposing surface is an intersection with the upper end surface. The molten resin extruded from the outlet is subjected to the fluid pressure, extends to the space below, and then follows the second region via the second flow path. Reaching the roll surface and closely contacting the roll surface along the first region via the first flow path.

  Since there is a pressure loss from the inlet to the outlet in the second channel, in order to make the channel cross-sectional width of the second channel constant, the radius of curvature is set at the outlet side, that is, in the fluid chamber. It is necessary to increase toward the upper end side. On the other hand, since the pressure loss is proportional to the channel length, the curvature radius of the second channel is increased by increasing the radius of curvature of the second region of the opposing surface toward the intersection with the upper end surface. And the following relational expression regarding the tensile tension per unit channel cross-sectional width, the static pressure at the inlet and outlet of the second channel, and the length of the second channel.

Here, r: radius of curvature (m) of _second channel, a ₂ : channel cross-sectional width (m) of _second channel, r + a ₂ : radius of curvature of molten resin (m), T: unit flow Take-up tension per road section width (N / m), p _2in : static pressure at the inlet of the second channel (Pa), p _2out : static pressure at the outlet of the second channel (Pa), L ₂ : Length of the second flow path, x: distance from the inlet in the second flow path (0 ≦ x ≦ L ₂ )

  In another embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the second region includes a curved portion that bends from the first region to the exit side of the die, and the curved portion continuously with the curved portion. It has a straight part perpendicular to the upper end surface.

In the above equation, if the static pressure at the outlet of the second flow path is atmospheric pressure, p _2out is zero and r is infinite, that is, a straight line. The static pressure at the outlet of the second flow path can be adjusted to about atmospheric pressure by configuring the straight portion that is continuous with the curved portion and orthogonal to the upper end surface.

  In another embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the second region includes a curved portion that bends from the first region to the outlet side of the die, and a second portion continuous with the curved portion. And a linear portion that is inclined in a direction of enlarging the cross section of the flow path of 2 and away from the outlet and intersects the upper end surface.

  When the dynamic pressure is not negligible near the outlet in the second flow path, that is, when the negative pressure at the outlet has a great influence on the extended posture of the molten resin in the space, the dynamic pressure at the outlet of the second flow path In order to reduce the dynamic pressure (flow velocity), the flow path at the outlet can be enlarged.

  In a preferred embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the lower end surface of the die facing the outlet and the upper end surface of the fluid chamber are both flat, and the upper end surface of the fluid chamber and the die A fluid flow path extending along the facing surface extends between the lower end surfaces of the second flow path to further form a third flow path, and the fluid flowing through the third flow path is less than the third flow path. Is also discharged in a large downstream direction of the cross section of the flow path.

  For example, the dynamic pressure (flow velocity) can be reduced by increasing the channel cross-sectional width of the third channel toward the outlet side to increase the channel cross-section.

  In another embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the flow path cross-sectional area of the third flow path is adjusted so that the fluid pressure in the third flow path is greater than atmospheric pressure. It is what.

  The negative pressure on the molten resin near the outlet of the die is adjusted by adjusting the cross-sectional width of the third flow path that continues from the second flow path so that the fluid pressure in the third flow path is greater than atmospheric pressure. The influence of can be eliminated. In this case, since the generation of the negative pressure moves to the outlet position of the third flow path, the molten resin extending in the space is not affected by the negative pressure.

  Further, in a preferred embodiment of the apparatus for producing a resin-coated substrate according to the present invention, fluids having at least two kinds of fluid pressures are provided from the fluid chamber, and are provided from an end region in the width direction of the fluid chamber. The fluid pressure of the fluid is adjusted to be relatively high compared to the fluid pressure of the fluid provided from the inner region.

  The fluid provided from the fluid chamber to the fluid flow path is actually in the middle of the flow path in the width direction of the molten resin in any of the first flow path, the second flow path, and the third flow path. It leaks outward from both ends of the resin coating (this is the width direction of the resin coating). In addition, when the neck-in occurs at the both ends of the molten resin, the molten resin film becomes thick, and the take-up tension increases accordingly. Therefore, the pressure in the end region in the width direction of the fluid chamber, that is, the portion through which both ends of the molten resin pass can be set to a high pressure with respect to the inner region. For example, a fluid chamber width end region and an inner region thereof may be defined, and high pressure fluid may be provided from the fluid chamber width end region. The high-pressure air at both ends can replenish air that leaks from the end of each channel after the first channel. Furthermore, since the effect | action which adhere | attaches the edge part of the molten resin on a pre-roll at high pressure is also show | played, the neck-in generate | occur | produced before solidifying can be suppressed effectively.

  In a preferred embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the fluid chamber includes an internal flow path and a cylindrical portion around the internal flow path, and the internal flow path faces the facing surface. A part of the end surface of the cylindrical portion communicates with the opening and serves as the second region of the opposing surface, and the end portion region in the width direction of the cylindrical portion includes one end surface of the cylindrical portion. An opening facing the portion and a separate flow path communicating with the opening are formed, fluid is provided from the internal flow path of the fluid chamber and flows through the fluid flow path, and the fluid flows from the separate flow path. Further fluid is provided to the flow path.

  A separate channel with a narrowed channel cross-section for providing a fluid independent of the fluid supplied from the fluid chamber and flowing through the fluid channel is provided in the end portion in the width direction of the cylindrical portion. The fluid provided from the above can replenish the air leaking from the end of each flow path after the second flow path, and ensure the static pressure necessary to balance the curvature radius and take-up tension of the molten resin. .

  In a preferred embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the temperature of the fluid provided from the separate flow path is higher than the temperature of the fluid flowing through the fluid flow path. Is.

  By making the temperature of the fluid provided from the separate flow path relatively high, the temperature of the molten resin can be kept high, and the take-up tension in the entire width direction can be lowered.

  Furthermore, in a preferred embodiment of the apparatus for producing a resin-coated substrate according to the present invention, the fluid chamber is composed of an internal flow path and a cylindrical portion around the internal flow path, and two side surfaces in the width direction of the cylindrical portion. A roller is attached to the roller, and the roller is in contact with the pre-roller so as to be rotatable so as to guarantee at least a channel cross-sectional width of the first channel.

  By arranging rollers on the two side surfaces (side plates) of the fluid chamber and allowing them to contact each other in a rotatable manner with the roll surface of the pre-roll, it is possible to ensure the cross-sectional width of the first flow path with high accuracy. Furthermore, the channel cross-sectional width of the first channel can be easily changed by adjusting the position of the roller.

  Further, the present invention extends to a method for producing a resin-coated substrate, and the method for producing a resin-coated substrate according to the present invention is a method in which a molten resin extruded downward from an outlet opened on a lower end surface of a die is made of a metal. Resin-coated substrate for producing a resin-coated substrate in which a molten resin is cooled and solidified by being sandwiched between a pair of laminating rolls that are positioned below the outlet and rotated together with the substrate, and the surface of the substrate is coated with a resin film A pre-roll between the outlet and the laminating roll, in the process of grounding the molten resin extruded from the outlet to the pre-roll and then feeding the molten resin between the pair of laminating rolls, A fluid is supplied from the chamber to a space between the outlet and the pre-roll below the outlet, and the fluid chamber has the space and the pair facing the pre-roll. While flowing the fluid to the die side through the fluid flow path along the surface, while applying the fluid pressure in the direction of pushing back the molten resin existing in the space to be displaced in the rotation direction of the pre-roll The molten resin is grounded to the pre-roll, and then the molten resin and the substrate are pressed between the laminate rolls, and the molten resin is cooled and solidified to produce a resin-coated substrate in which the surface of the substrate is coated with a resin film. . There are two dies, each of which has the pre-roll below each die, and the molten resin extruded downward from the outlet of each die is grounded to the corresponding pre-roll. A method may be adopted in which a pressure is sandwiched between a pair of laminate rolls in a sandwiched posture.

  In this manufacturing method, the fluid is heated to adjust its temperature, and the heated temperature-controlled fluid is provided from the fluid chamber to the space, or the pre-roll is heated to adjust the surface temperature. It is preferable that the molten resin is grounded to the pre-roll surface that is heated and adjusted.

  Furthermore, it is preferable to heat the molten resin that is between the pre-roll and the pair of laminate rolls and is grounded to the pre-roll and sent downward, and the heated molten resin is sent to the pair of laminate rolls.

  The opposing surface includes a first region that has a complementary shape to the roll surface of the pre-roll, and a second region that bends from the first region to the outlet side of the die and reaches the upper end of the fluid chamber. And the fluid flow path is between the first flow path between the first area and the molten resin on the roll surface, and between the second area and the molten resin in the space below the outlet. The flow path cross-sectional width of the 1st flow path which consists of a 2nd flow path and is continuous with the 2nd flow path is narrow compared with the internal flow path of the fluid chamber which is an upstream of the flow of a fluid. Is preferred.

  The upper end surface of the fluid chamber forms a flat surface, and the radius of curvature of the second region of the opposing surface increases toward the intersection with the upper end surface, and the molten resin extruded from the outlet While applying the fluid pressure, the molten resin is allowed to reach the roll surface along the second region via the second flow path after extending to the space below. It is preferable to adhere to the roll surface along the first region via one flow path.

  As another form of the manufacturing method according to the present invention, the second region is orthogonal to the upper end surface, and the molten resin is applied while applying the fluid pressure to the molten resin extruded from the outlet. Is extended vertically downward in the space to reach the roll surface along the second region via the second flow path, and the first flow path via the first flow path. It may be in close contact with the roll surface so as to follow the region. In this embodiment, the second region has a curved portion that bends from the first region to the outlet side of the die, and a straight portion that is continuous to the curved portion and orthogonal to the upper end surface. It may be.

  As another form of the manufacturing method according to the present invention, the second region includes a curved portion that bends from the first region to the outlet side of the die, and a flow of the second flow path continuously to the curved portion. It may have a straight portion that is inclined in the direction of increasing the road cross section and away from the exit and intersecting the upper end surface.

  As a preferred embodiment of the manufacturing method according to the present invention, the lower end surface of the die facing the outlet and the upper end surface of the fluid chamber are both flat, and the upper end surface of the fluid chamber and the lower end surface of the die are formed. A fluid channel extending along the opposing surface extends to form a third channel, and a fluid is allowed to flow through the third channel next to the second channel. You may discharge | release a fluid to the downstream direction with a larger flow-path cross section than a path | route. In this embodiment, the flow path cross-sectional area of the third flow path may be adjusted so that the fluid pressure in the third flow path is greater than atmospheric pressure.

  As another form of the manufacturing method according to the present invention, the flow path resistance of the first flow path may be adjusted to 0.3 times or more the flow path resistance of the second flow path.

  As another form of the manufacturing method according to the present invention, at least two kinds of fluid pressure fluids are provided from the fluid chamber, and the fluid pressure of the fluid provided from the end region in the width direction of the fluid chamber. May be adjusted so as to have a relatively high pressure compared to the fluid pressure of the fluid provided from the inner region.

  As another form of the manufacturing method according to the present invention, the fluid chamber is composed of an internal flow path and a cylindrical portion around the internal flow path, and the internal flow path communicates with an opening facing the opposing surface, and A part of the end surface of the cylindrical part is the second region of the opposing surface, and an opening facing the part of the end surface of the cylindrical part is formed in the end region in the width direction of the cylindrical part. A separate flow channel is formed, and fluid is supplied from the internal flow channel of the fluid chamber to the fluid flow channel, and further fluid is supplied from the separate flow channel to the fluid flow channel. You may do. Here, it is preferable that the temperature of the fluid provided from the separate flow path is set higher than the temperature of the fluid flowing through the fluid flow path.

  Furthermore, as a preferred embodiment of the manufacturing method according to the present invention, the fluid chamber is composed of an internal flow path and a cylindrical portion around the internal flow path, and rollers are attached to two side surfaces in the width direction of the cylindrical portion. It is preferable that the roller is in contact with the pre-roller so as to be rotatable so as to ensure at least the channel cross-sectional width of the first channel.

  As can be understood from the above description, according to the apparatus and method for producing a resin-coated substrate of the present invention, a pre-roll is arranged between the lower part of the die outlet and the pair of laminate rolls, and between the pre-roll and the die outlet. The fluid provided from the fluid chamber is caused to flow along the fluid flow path along the facing surface of the fluid chamber facing the space and the pre-roll, and the molten resin existing in the space is displaced in the rotation direction of the pre-roll and is taken up. By pushing back by the fluid pressure of the fluid flowing through this fluid flow path, the molten resin extruded vertically downward from the outlet can be extended vertically downward as much as possible. The length of the existing molten resin can be made as short as possible. Therefore, while exhibiting a high neck-in suppressing effect, it is possible to effectively suppress film fluctuations, and it is also possible to effectively suppress the mains in a trade-off relationship with this neck-in suppression.

It is the schematic diagram which showed one Embodiment of the manufacturing apparatus of the resin coating board | substrate of this invention. FIG. 2 is an enlarged view of part II of FIG. 1 showing an embodiment of a space between a die outlet and a pre-roll and a fluid chamber, wherein (a) is a melting of the space between the die outlet and the pre-roll. It is a figure explaining the state which the fluid pressure of the fluid which flows through a fluid flow path acts in the direction which pushes back deformation | transformation of resin, (b) is a bb arrow line view of (a). It is the schematic diagram which showed other embodiment of the manufacturing apparatus of the resin coating board | substrate of this invention. It is the schematic diagram which showed other embodiment of the manufacturing apparatus of the resin coating board | substrate of this invention. It is the schematic diagram which showed other embodiment of the manufacturing apparatus of the resin coating board | substrate of this invention. It is the schematic diagram which showed other embodiment of the manufacturing apparatus of the resin coating board | substrate of this invention. (A) is the first flow path, the second flow path, and the third flow path formed between the fluid chamber and the pre-roll, the space, and the die of the embodiment shown in FIG. It is the figure explaining the surface, (b), (c) is the figure explaining other embodiment of the opposing surface of a fluid chamber. It is a figure explaining that a local convex part is formed in molten resin in the 2nd channel. (A) is the figure explaining other embodiment of the fluid chamber, (b) is a bb arrow line view of (a). (A) is a figure explaining other embodiment of the fluid chamber, (b) is a bb arrow line view of (a). (A) is a figure explaining other embodiment of the fluid chamber, (b) is a bb arrow line view of (a). It is the figure explaining one Embodiment of the manufacturing apparatus of the conventional resin coating board | substrate. It is the figure explaining other embodiment of the manufacturing apparatus of the conventional resin coating board | substrate.

Hereinafter, the manufacturing apparatus and manufacturing method of the resin-coated substrate of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic view showing an embodiment of the apparatus for producing a resin-coated substrate of the present invention. FIG. 2 is an enlarged view of a portion II in FIG. 1, and a space between a die outlet and a pre-roll and a fluid chamber. FIG. 2A is a diagram showing an embodiment of the present invention, in which FIG. 2A shows a state in which the fluid pressure of the fluid flowing through the fluid flow path acts in a direction to push back the deformation of the molten resin in the space between the die outlet and the pre-roll. FIG. 2B is a view taken along the line bb in FIG. 2A.

  The illustrated manufacturing apparatus 10 includes an extruder 2 that extrudes molten resin, a die 1 that communicates with the extruder 2 and has an outlet 1a having a predetermined width, and is positioned below the die 1 at a predetermined rotational speed. A resin which is freely rotatable (X2 direction, X3 direction) and the molten resin sent and the metal substrate BP are sandwiched, the molten resin fl is cooled and solidified, and the resin film FL is coated on the surface of the substrate BP. A pair of laminating rolls 3B and 3C for manufacturing a coated substrate, and a rotatable pre-roll which is located between the die 1 and the pair of laminating rolls 3B and 3C and is grounded by the molten resin fl extruded from the outlet 1a (Z direction) 3A and 3A (X1 direction, X1 ′ direction) and a fluid providing unit 7 including a fluid chamber 5 that provides a fluid to the space between the die 1 and the pre-roll 3A.

  The fluid providing unit 7 includes a compressor 6 that forms pressure air and a fluid chamber 5 that provides pressure air.

  As shown in FIG. 2b, the fluid chamber 5 includes a rectangular frame-shaped cylindrical portion (top plate 5a, side plate 5b, bottom plate 5c) and a central flow path 5d. As shown in FIG. 2a, the pre-roll 3A is formed. The side facing surface has a complementary shape to the pre-roll 3A.

  As shown in FIG. 2, the opposed surface of the top plate 5a of the cylindrical portion facing the pre-roll 3A and the space K is substantially linear (including both curved and straight lines) having a complementary shape to the pre-roll 3A. The first region 5a1 and the second region 5a2 which is bent from the first region 5a1 to the outlet 1a side of the die 1 and is orthogonal to the upper end surface 5a3 of the fluid chamber 5.

  The intersection of the second region 5a2 and the upper end surface 5a3 orthogonal to each other is disposed at a position set back by a predetermined width with respect to the outlet 1a facing the flat lower end surface 1b of the die 1.

  The molten resin fl extruded downward from the outlet 1a extends through the space K, contacts the pre-roll 3A, and is further pressed downward and pinched together with the substrate BP by the pair of laminating rolls 3B and 3C. A resin-coated substrate in which a resin film FL formed by cooling and solidifying fl covers the substrate BP is manufactured.

  The fluid fd generated by the compressor 6 is provided from the internal flow path 5d to the molten resin fl on the surface of the pre-roll 3A. Here, while applying the fluid pressure p to the molten resin fl, the fluid fd is provided between the molten resin fl and the fluid chamber 5. In the gap S (fluid channel). As shown in FIG. 7, the fluid fd flowing upward applies a fluid pressure p to the molten resin fl extending into the space K below from the outlet 1a in the process of flowing through the fluid flow path along the facing surface, thereby exiting the outlet 1a. In particular, the molten resin extruded vertically downward in the space K in the vicinity of the outlet 1a extends vertically downward, and reaches the roll surface along the second region 5a2 via the fluid flow path. Then, it closely adheres to the roll surface along the first region 5a1 via the fluid flow path.

(Embodiment 2)
FIG. 3 shows another embodiment of the resin-coated substrate manufacturing apparatus of the present invention. The illustrated manufacturing apparatus 10 </ b> A includes two extruders 2 and two dies 1 that communicate with the extruder 2, and further includes a corresponding pre-roll 3 </ b> A below each die 1.

  The molten resin fl extruded downward from the outlet 1a of each die 1 contacts the corresponding pre-roll 3A, and the semi-molten resin fl after contacting the two pre-rolls 3A passes between the two dies 1 and 1. It is sent between a pair of laminating rolls 3B and 3C so as to sandwich both sides of the substrate BP conveyed downward (Y direction), and is sandwiched between the substrates BP and resin coatings FL and FL on both sides thereof. A substrate is manufactured.

(Embodiment 3)
FIG. 4 shows another embodiment of the apparatus for producing a resin-coated substrate of the present invention. The illustrated manufacturing apparatus 10 </ b> B includes a fluid chamber 5 in which a first heating unit 8 </ b> A such as a heater is built. The fluid fd generated by the compressor 6 by the first heating unit 8A can be adjusted to a desired heating temperature, and the heated temperature-controlled fluid can be provided to the molten resin fl in the space K. The first heating unit 8 </ b> A is built in the compressor 6 in addition to being built in the fluid chamber 5, and is built in a flow path connecting the compressor 6 and the fluid chamber 5. It may be.

  By controlling the amount of cooling when the molten resin fl contacts the surface of the pre-roll 3A as desired, the nip of the laminate rolls 3B and 3C is suppressed by suppressing the excessive cooling of the molten resin by the heated temperature-controlled fluid. It is possible to control the temperature of the molten resin fl in the clamping portion so as to be a temperature necessary for the substrate BP and the resin coating FL to be integrated with high adhesion.

(Embodiment 4)
FIG. 5 shows another embodiment of the resin-coated substrate manufacturing apparatus of the present invention. The illustrated manufacturing apparatus 10 </ b> C includes a pre-roller 3 </ b> A in which a second heating unit 8 </ b> B such as a heater is built. As with the third embodiment, the temperature of the molten resin fl at the nip clamping portion of the laminate rolls 3B and 3C is such that the substrate BP and the resin coating FL have a high adhesion force by the second heating unit 8B built in the pre-roll 3A. The temperature can be controlled to be necessary for integration.

(Embodiment 5)
FIG. 6 shows another embodiment of the apparatus for producing a resin-coated substrate of the present invention. The manufacturing apparatus 10D shown in the figure is between a pre-roll 3A and a pair of laminating rolls 3B and 3C, and a heater (including an IR heater) or an oven is placed on a conveying path that is grounded to the pre-roll 3A and the molten resin fl is sent downward. A third heating unit 9 such as a furnace is provided.

  The more the molten resin is cooled, the greater the neck-in suppression effect, the higher the film shaking prevention effect, and the further increase in the laminating speed, but if the temperature of the molten resin decreases too much, There is a risk that the adhesive strength of the resin coating is reduced. Therefore, in order to guarantee the temperature of the molten resin at the nip pressing portions of the laminate rolls 3B and 3C, a third heating unit 9 is provided in the space from the pre-roll 3A to the nip pressing portions of the pair of laminate rolls 3B and 3C. Thereby, the high adhesive force between a board | substrate and a resin film can be ensured. 6 may be a separate manufacturing apparatus in which the first heating unit 8A shown in FIG. 4 and the second heating unit 8B shown in FIG. 5 are further applied to the manufacturing apparatus 10D shown in FIG.

(Effects of fluid chamber)
Here, with reference to FIG. 7a, the extended orientation of the molten resin from the outlet 1a of the die 1 to the surface of the pre-roll 3A by the fluid flow path formed by the fluid chamber 5 and the pre-roll 3A having the opposed surfaces shown in the figure. The stabilization of the (conveyance path) will be described below. In addition, FIG. 8 is a figure explaining that a local convex part is formed in molten resin in a 2nd flow path.

In the drawing, the fluid flow path is such that the gap S area corresponding to the first area 5a1 on the opposite surface is the first flow path, and then the gap S area corresponding to the second area 5a2 is the second flow path. Next, the gap between the upper end surface 5a3 of the fluid chamber 5 and the lower end surface 1b of the die 1 is a third flow path. Also, in the same figure, r: radius of curvature of the opposite surface of the inlet of the second channel corresponding to the second region, A: position of the inlet of the first channel, B: of the first channel Channel outlet position (or channel inlet position of the second channel), C: Channel outlet position of the second channel (or channel inlet position of the third channel), D: Third flow Channel outlet position of the channel, p _C : chamber pressure, p ₀ : atmospheric pressure, p _2in : channel inlet pressure of the second channel, p _2out : channel outlet pressure of the second channel (third P _2out = p ₀ ), Q: flow rate, T: take-up tension, L ₁ : length, a ₁ : channel cross-sectional width (gap), v ₁ : Flow velocity, Re ₁ : Reynolds number, 2nd flow path, L ₂ : Length, a ₂ : Flow path cross-sectional width (gap), v ₂ : Flow velocity, Re ₂ : Reynolds number, 3rd flow path, L ₃ : Length, a ₃ : Channel cross-sectional width (gap), v ₃ : Flow velocity, Re ₃ : Reynolds number.

In the second channel, the take-up tension T (N / m) per unit width of the molten resin fl, the radius of curvature r (m), the channel cross-sectional width a ₂ (m) of the _second channel, the static pressure p When (Pa), the following formula is established.

ただし、流体が方向を変える際の遠心力と動圧は無視できるものとする。

However, the centrifugal force and dynamic pressure when the fluid changes direction can be ignored.

That is, in the second flow path, even if the flow path cross-sectional width a ₂ of the molten resin fl varies locally, as long as the take-up tension T and the static pressure p do not change, the original radius of curvature r that satisfies Equation 1 is satisfied. Return to + a ₂ .

Further, since the molten resin fl facing the second flow path has a curved surface, it is rigid and local unevenness is unlikely to occur. However, as shown in FIG. 8, when a convex portion fl ′ is generated locally and instantaneously due to some disturbance in the second flow path, the radius of curvature of the base portion of the convex portion fl ′ must be negative. I must. At this time, a portion with a negative curvature radius cannot exist due to the pressure of the second flow path, and the curvature radius becomes large and gentle. As a result, the flow path cross-sectional width a2 of the _second flow path is increased, but the molten resin fl moves in a direction in which the flow path cross-sectional width of the second flow path becomes narrower due to self-restoration to be described later. The road cross section width a ₂ returns to the curvature radius r + a ₂ . The radius of curvature of the molten resin fl along the second flow path can be set in a wide range, and the smaller the radius of curvature, the smaller the distance from the exit 1a of the die 1 to the pre-roll 3A, Neck-in can be effectively suppressed.

  In addition, since the cross-sectional width of the first flow path continuous to the second flow path is narrowed, a throttling effect of the fluid fd flowing through the second flow path corresponding to the second region 5a2 is obtained. In the process of changing the cross-sectional width of the flow path from the second flow path to the upper end surface 5a3 of the fluid chamber 5, the molten resin can be provided with self-stability against this change. For example, when the pressure of the fluid provided from the fluid chamber 5 is constant and the molten resin moves in the direction of widening the cross-sectional width of the second flow path due to disturbance (turbulence of outside air, etc.), The flow rate from the fluid chamber 5 increases due to the decrease in the flow path resistance of the fluid flow path, and the flow path cross-sectional width of the first flow path is constant (the flow path resistance is constant). The static pressure in the second flow path increases, and the second flow path of the molten resin returns to the direction of narrowing. On the other hand, when the molten resin moves in the direction of narrowing the channel cross-sectional width of the second channel, the flow rate from the fluid chamber decreases due to an increase in the channel resistance of the fluid channel, and the flow of the first channel Since the cross-sectional width is constant (the flow path resistance is constant), the pressure loss is reduced by the increase in flow velocity, the static pressure in the second flow path is increased, and the second flow path of the molten resin is widened. Return to the direction. Thus, in the process in which the channel cross-sectional width changes in the second channel, the molten resin has self-stability with respect to this change.

  If there is no channel resistance in the first channel and the molten resin moves in the direction of widening the channel cross-sectional width of the second channel, the original pressure in the chamber becomes the pressure in the second channel. The molten resin moves in the direction in which the channel cross-sectional width increases, and the self-stability of the fluid channel is lost. For this reason, the 1st flow path by which the cross-sectional width of the flow path was narrowed with respect to the stability of the fluid flow path is a necessary condition. When the channel cross-sectional width of the second channel is increased, the radius of curvature of the molten resin is increased, and the take-up tension is balanced with a small static pressure. Actually, when the flow path cross-sectional width is increased, the first flow is set so that the decrease in the static pressure in the second flow path is larger than the decrease in the required static pressure due to the increase in the radius of curvature of the molten resin. What is necessary is just to determine the shape of both a path | route and a 2nd flow path.

In addition, by providing the first flow path, even if the take-up tension T of the molten resin slightly changes due to changes in molding conditions such as the take-up speed and extrusion temperature, the second flow path is not changed. To the required pressure p _2in = T / (r + a ₂ ). This balance range can be increased by appropriately selecting the chamber source pressure and the channel resistance of the first channel.

  In this way, by providing the first flow path, as a result, the extended posture in the space of the molten resin from the outlet 1a of the die 1 along the second flow path to the pre-roll 3A (conveying path) ) Is stabilized (restrained). In addition, the first flow path makes it possible to reduce the flow rate flowing through the flow path, and the effect of preventing film shaking is also enhanced.

  Regarding the self-stability of the channel cross-sectional width of the second channel, the inlet B (boundary with the first channel) and the outlet C (second channel) of the second channel whose channel resistance varies due to disturbance The larger the ratio of the static pressure difference between the inlet A and outlet B of the first channel having a constant channel resistance to the static pressure difference between the channel and the upper end surface 5a3 of the fluid chamber 5, the higher the self-stability. . That is, the larger the value of the channel resistance of the first channel / the channel resistance of the second channel in the steady state, the higher the self-stability of the second channel. That is, this ratio must be increased and adjusted so that at least the influence of the change in the static pressure is greater than the influence of the change in the radius of curvature.

Further, the self-stability can be evaluated by the magnitude of the pressure change amount when the pressure change occurs and the magnitude of the flow rate change amount with respect to the change in the channel cross-sectional width of the second channel. When the first flow path the flow path resistance of the second flow path is increased, if necessary static pressure at the inlet B of the second channel are the same, the chamber base pressure p _C increases, the second If the flow path cross-sectional width a ₂ of the flow path is changed, the pressure variation of the required static pressure is large, the variation of the flow rate is small. Thus, the self-restoring force increases by increasing the channel resistance of the first channel.

In addition, the channel resistance of the first channel is preferably high, but in the relational expression between the flow rate Q and the pressure loss, the channel resistance is proportional to the channel length and inversely proportional to the cube of the channel cross-sectional width. If the channel length L1 of the _first channel is increased, the channel resistance increases, but the position where the molten resin is pressed against the pre-roll 3A by the pressure in the fluid chamber 5 is far from the die outlet 1a. . That is, the molten resin comes in contact with the surface of the pre-roll 3A and comes into close contact with it, which is disadvantageous from the viewpoint of cooling and solidifying, and the neck-in amount increases. On the other hand, it can be said that reducing the channel cross-sectional width a ₁ is effective because the channel resistance increases to the third power. In the conventional apparatus for manufacturing a resin-coated substrate, the thickness of both end portions of the resin on the surface of the laminate roll is large, and the cross-sectional width of the flow path cannot be narrowed. can be narrowed the passage cross-sectional width a ₁ since the thickness increment of the end portions of the resin 3A surface and laminating roll 3B surface decreases. This regard the dimensions of the flow path cross-sectional width a _1, is applied practically 1mm or less, it is confirmed that more preferably 0.5mm or less. Furthermore, the larger the value of the channel resistance of the first channel / the channel resistance of the second channel, the better, but it is desirable to ensure 0.3 times or more practically.

In addition, since there is a pressure loss from the inlet B to the outlet C in the second channel, in order to make the channel cross-sectional width a ₂ of the _second channel constant, the radius of curvature r is set to the outlet. It is necessary to increase toward the side, that is, the intersection with the upper end surface 5a3 of the fluid chamber 5. On the other hand, since the pressure loss is proportional to the flow path length, the radius of curvature r of the second region of the opposing surface is increased toward the intersection with the upper end surface 5a3, so that the second flow path The following relational expression (formula 2) relating to the radius of curvature r, the tensile tension T per unit channel cross-sectional width, the static pressure at the inlet B and the outlet C of the second channel, and the length L2 of the _second channel is as follows. Can be satisfied.

Here, r: radius of curvature (m) of _second channel, a ₂ : channel cross-sectional width (m) of _second channel, r + a ₂ : radius of curvature of molten resin (m), T: unit flow Take-up tension per road section width (N / m), p _2in : static pressure at the inlet of the second channel (Pa), p _2out : static pressure at the outlet of the second channel (Pa), L ₂ : Length of the second flow path, x: distance from the inlet in the second flow path (0 ≦ x ≦ L ₂ )

In Equation 2, if the static pressure at the outlet C of the second flow path is atmospheric pressure, p _2out becomes zero and r becomes infinite, that is, a straight line. Like the fluid chamber 5A shown in FIG. 5, the second flow path is formed by configuring the facing surface of the curved portion 5a2 ′ and the straight portion 5a2 ″ that is continuous with the curved portion 5a2 ′ and orthogonal to the upper end surface 5a3. The static pressure at the outlet C can be adjusted to about atmospheric pressure.

  If the dynamic pressure is not negligible in the vicinity of the outlet C in the second flow path, that is, if the negative pressure at the outlet C greatly affects the extended posture of the molten resin in the space K, the second flow path In order to reduce the dynamic pressure at the outlet C, the dynamic pressure (flow velocity) can be reduced by expanding the flow path at the outlet C. That is, the second region on the opposite surface of the fluid chamber 5B shown in FIG. 7c is a curved portion 5a2 ′ that bends from the first region to the outlet 1a side of the die 1 and the curved portion 5a2 ′ continues to the second region. The straight line portion 5a2 ′ ″ that inclines in the direction of enlarging the cross section of the flow path and away from the outlet 1a and intersects the upper end surface 5a3.

2 and 7, a third flow path is formed between the flat lower end face 1b of the die 1 and the flat upper end face 5a3 of the fluid chamber 5, and the fluid flowing through the fluid flow path is Then, after flowing through the third flow path, it is discharged to the downstream side having a flow path cross-sectional width larger than that of the third flow path and communicating with the atmosphere (released fluid fd1 in FIG. 2). Thus, the dynamic pressure (flow velocity) can be reduced by increasing the channel cross-sectional width a3 of the _third channel toward the outlet D side to increase the channel cross-section.

Here, the flow path cross-sectional area of the third flow path is adjusted such that the fluid pressure in the third flow path is greater than the atmospheric pressure. By adjusting the channel cross-sectional width a ₃ of the third channel continuing from the second channel, the channel cross-sectional area is adjusted, and the influence of the negative pressure on the molten resin in the vicinity of the outlet 1a of the die 1 is affected. It can be lost. In this case, since the generation of the negative pressure moves to the outlet D side of the third flow path, the molten resin extending in the space K is not affected by the negative pressure.

  The fluid pressure p, the rotation speed of the laminate rolls 3B and 3C, the extrusion speed of the molten resin, and the like can be adjusted by a control computer (not shown). In addition, if necessary, a device that illustrates a CCD camera or a video camera that can visually recognize the extended orientation (such as the vertical direction) of the molten resin in the space K may be provided. For example, the laminate roll is rotated at a predetermined rotational speed. Monitoring the extended orientation of the molten resin in the space when the molten resin is extruded at a predetermined extrusion speed with a video camera or the like, for example, while visually monitoring this monitor image, the extended orientation of the molten resin in the space It is also possible to adjust the fluid pressure of the pressure air so as to have a desired posture.

  Further, the molten resin fl is quickly pressed against and closely adhered to the pre-roll 3A by the fluid pressure p provided by the pressure fluid fd provided from the air chamber 5, so that it is in a semi-molten state, thereby being approximately the same as the width of the extruded molten resin fl. It is possible to guarantee the production of the resin coating FL having a width of.

  Here, the resin material for the resin coating is not particularly limited. For example, polyolefin, polyester, polyamide, modified products or mixtures thereof, which are thermoplastic resin trees that exhibit fluidity when heated, are applied. it can.

9, 10, and 11 are diagrams for explaining another embodiment of the fluid chamber.
The fluid chamber 5C shown in FIG. 9 has a flow path inside thereof defined in three sections, and is composed of flow paths 5e and 5e in the width direction end region of the fluid chamber 5C, and an internal region 5d inside thereof. The fluid pressure of the fluid provided from the flow path 5e in the width direction end region is adjusted to be relatively high compared to the fluid pressure of the fluid provided from the internal region 5d to the fluid flow path.

  The fluid provided from the fluid chamber to the fluid flow path is actually in the middle of the flow path in the width direction of the molten resin in any of the first flow path, the second flow path, and the third flow path. It leaks outward from both ends of the resin coating (this is the width direction of the resin coating). In addition, when the neck-in occurs at the both ends of the molten resin, the molten resin film becomes thick, and the take-up tension increases accordingly. Therefore, the pressure in the end region in the width direction of the fluid chamber, that is, the portion through which both ends of the molten resin pass can be set to a high pressure with respect to the inner region. Therefore, as shown in the drawing, the high-pressure fluid at both ends provided from the channel 5e in the width direction end region can replenish the air leaking from the end of each channel after the first channel. . Furthermore, since the effect | action which makes the edge part of the molten resin in the pre-roll 3A surface contact | adhere with a high voltage | pressure is also show | played, the neck-in generate | occur | produced before solidifying can be suppressed effectively.

  Further, the fluid chamber 5D shown in FIG. 10 is provided with a channel 5f separate from the internal channel 5d in the end region in the width direction of the cylinder portion. An opening is provided in the middle of the second region 5a2 so as to face the facing surface.

  A separate channel 5f having a narrowed channel cross section for providing a fluid independent of the fluid supplied from the fluid chamber and flowing through the fluid channel is provided in the end portion in the width direction of the cylindrical portion. The fluid provided from the channel 5f supplements the air leaking from the end of each channel after the second channel and secures the static pressure required to balance the curvature radius and take-up tension of the molten resin. Can do.

  Here, by making the temperature of the fluid provided from the separate flow path 5f relatively high, the temperature of the molten resin can be kept high, and the take-up tension in the entire width direction can be lowered. .

  Further, in the fluid chamber 5E shown in FIG. 11, a roller 5g is attached to two side plates 5b in the width direction of the cylindrical portion, and the roller 5g is rotatably contacted with the pre-roll 3A so that at least the flow path of the first flow path. The cross-sectional width is guaranteed.

  The roller 5g can ensure the channel cross-sectional width in the first flow path with high accuracy, and the flow path cross-sectional width of the first flow path can be easily changed by adjusting the position of the roller 5g. can do.

[Calculation results applying real values]
The take-up tension of the molten resin is generally determined by the resin and its molding conditions, and this value can be measured with a commercially available capillary rheometer or the like. Here, since the specification of the apparatus can be determined by calculation if the take-up tension is known, the inventors performed various calculations shown below.

(Assumptions in calculation)
Since temperature change and density change accompanying pressure change are small, an isothermal incompressible viscous fluid is used. Moreover, since the speed of the fluid in the 2nd flow path and the 1st flow path is large compared with the lamination speed, it is set as the flow between fixed parallel plates. For example, when the laminating speed is 20 mpm (0.33 [m / s], it can be approximated by the flow between the fixed plates because it is smaller than the wind speed of the internal flow path in the fluid chamber. It is assumed that the take-up tension of the resin in the flow path is supported by static pressure, that is, since the flow rate is small, the dynamic pressure and centrifugal force when the fluid in the second flow path changes direction, and further the fluid flow path It is assumed that the pressure loss due to sudden contraction and expansion is negligible.

(Actual calculation result)
Take-up tension per unit width of molten resin: T = 5 (N / m),
Radius of curvature in the second region corresponding to the second channel in contact with the first channel: r = 5 × 10 ⁻³ (m),
Channel cross-sectional width of the _first channel: a ₁ = 0.3 × 10 ⁻³ (m),
If the channel cross-sectional width of the _second channel: a ₂ = 0.3 × 10 ⁻³ (m), the required static pressure at the channel inlet of the second channel is

If the radius of curvature is increased from the inlet B to the outlet C of the second channel and is made infinite (straight) at the outlet C, the channel cross-sectional width of the second channel can be made constant. _Assuming that p _2in = 943 (Pa) at the second channel inlet B and p ₀ = 0 (atmospheric pressure) at the outlet C, the pressure loss of the _second channel is Δp ₂ = p _2in -p ₀ = 943 (Pa ). Fluid viscosity: μ = 18 × 10 ⁻³ (Pa · s), and for the required flow rate Q, the following formula is established in the laminar flow region. This time, laminar basins are the target, but turbulent basins can be calculated in the same way just by using different formulas.

このときの第２の流路、第１の流路の流体の速度ｖは、ｖ=ｖ₁= ｖ_２ (∵a₁=a₂)

The velocity v of the fluid in the second channel and the first channel at this time is v = v ₁ = v ₂ (∵a ₁ = a ₂ )

Here, the kinematic viscosity γ = μ / ρ (m ² / s) of the fluid, the density ρ = 1.2 (kg / m ³ ), the average depth m of the flow path m = the cross-sectional area (m ² ) / wetting edge (m) Become. Therefore,

Reynolds number Re is

  The fluid flow was laminar, and it was confirmed that there was no problem with the relationship between pressure loss and flow rate for laminar flow.

Since the flow rate Q = 0.0118 (m ³ / s), the pressure loss Δp ₁ in the first flow path is

The dynamic pressure p _v due to the flow velocity v in the first channel and the second channel is

Thus the original pressure p _c in the chamber,

  Thus, if the take-up tension of the molten resin is measured, the pressures in the first channel, the second channel and the fluid chamber can be determined.

Next, let us calculate the self-stability of the flow path in this example. First, the flow rate Q in the case of a ₂ = 0.45 × 10 ⁻³ (m) where the channel cross-sectional width of the second channel is increased by 50% is obtained.

Here, the relationship between the chamber source pressure p _c , the first channel pressure loss Δp1, the second channel pressure loss Δp2, and the second channel velocity (fluid outlet velocity) is as follows.

Substituting equations (b), (c), and (d) into equation (a) and organizing Q,

Solving the above equation for Q results in Q = 0.01648 (m ³ / s). At this time, V ₂ = 24.3 (m / s) from the equation (d). Furthermore, since Q is constant, V ₁ = (a ₂ / a ₁ ) V ₂ = 36.4 (m / s).

Therefore, the Reynolds number Re ₁ of the _first channel and the Reynolds number Re ₂ of the _second channel are

In equations (b) and (c), Δp ₁ = 2185 (Pa) and Δp ₂ = 388 (Pa), so that the pressure loss in the first flow path increases and the static pressure p at the second flow path inlet increases. _2in becomes _{p 2in = p 2in -p 0 =} Δp 2 = 388 (Pa).

Further, when confirming the radius of curvature r + a ₂ when the second flow path is expanded and the necessary static pressure p _2in balanced with the take-up tension T, p _2in = T / (r + a ₂ ) = 5 / ((5 + 0.45 ) × 10 ⁻³ ) = 917 (Pa), which is higher than the pressure drop of the second flow path, and has a self-restoring force that returns to the direction in which the expanded flow path cross-sectional width becomes narrower. If this value becomes lower than the static pressure in the second flow path, the cross-sectional width of the flow path becomes larger in the expanding direction, and the self-restoring force disappears.

  That is, when the cross-sectional width of the second flow path of the above-described formula (d) is widened, the radius of curvature of the molten resin becomes large and balances with the take-up tension with a small static pressure. Since the decrease in the static pressure of the second flow path is larger than the decrease in the required static pressure due to the increase in the radius of curvature of the molten resin when the cross-sectional width of the flow path is widened, the molten resin is in the second flow path. It was confirmed that the channel cross-sectional width returned to the direction of narrowing. In this way, the shapes of the first flow path and the second flow path may be determined so that the self-restoring force can be maintained.

Next, when calculating similarly in the case of a ₂ = 0.15 × 10 ⁻³ (m) where the channel cross-sectional width of the second channel is reduced by 50%, the flow rate Q and the flow velocity v of the channel are Q = 0.0036 (m ³ / s), v ₁ = 8.0 (m / s), v ₂ = 15.9 (m / s), and the Reynolds number Re is Re ₁ = 320 <2000 and Re ₂ = 318 <2000.

Regarding pressure loss, Δp ₁ = 479 (Pa) and Δp ₂ = 2297 (Pa). That is, p _2in = 2297 (Pa), the pressure loss in the first flow path decreases, and the static pressure at the second flow path inlet increases. Furthermore, the required static pressure component p _2in that balances with the radius of curvature r + a ₂ and the take-up tension T when the second channel is narrowed is p _2in = T / (r + a ₂ ) = 5 / ((5 + 0.15) × 10 ⁻³ ) = 970 (Pa). It can be seen that this value is lower than the actual p _2in = 2297 (Pa). From the above, it was confirmed that the narrowed second channel has a self-restoring force in the direction in which the channel cross-sectional width increases.

Further, when a case of a longer length only L ₂ of the second channel calculating said Similarly, when ^{_{L 2 = 50 × 10 -3 (}} m), a chamber base pressure p _c = 4500 (Pa) (Constant When p _2in = 943 (Pa) and Q = 0.0118 (m ³ / s) are the same), and the channel cross-sectional width of the second channel is increased by 50%, the inlet pressure p _2in = 345 (Pa), Q = 0.0145 (m ³ / s), and when the channel cross-sectional width of the second channel is reduced by 50%, the inlet pressure p _2in of the second channel p _2in = 2994 (Pa), Q = 0.0047 (m ³ / s), which indicates that the amount of change in pressure is large and the amount of change in flow rate is small compared to L ₂ = 25 × 10 ⁻³ (m).

  When the first flow path is opened to the atmosphere, the speed approaches 0, and the first flow path outlet speed (dynamic pressure) changes to static pressure. The static pressure generated at this time becomes negative pressure.

となり、大気開放出口から流速の減少にともなって最大で-412(Pa)の負圧が生じる。

Thus, a maximum negative pressure of −412 (Pa) is generated as the flow velocity decreases from the atmosphere opening outlet.

When this negative pressure component adversely affects the route of the molten resin at the die outlet, a _third flow path having a length L ₃ and a fluid cross-sectional width a ₃ is added to separate the atmosphere release position from the molten resin. Can do. When the dynamic pressure component is completely converted into the static pressure component in the third channel, assuming that L ₃ = 10 × 10 ⁻³ [m], the fluid channel width a ₃ is as follows.

Thus the effect of a _3, L ₃ is but computable, when the present dimensions a _3, the static pressure of 412Pa to the molten resin outlet in the increased positive pressure. In practice, the flow path cross-sectional width a ₃ leave greater than the calculated value, if the size expected a certain degree of flow resistance, and can move the negative pressure generating in a position away from the die outlet Become. Furthermore, it is desirable to adjust so that the molten resin in the vicinity of the die exit is stabilized.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Die, 1a ... Outlet, 1b ... Lower end surface, 2 ... Extruder, 3A ... Pre-roll, 3B, 3C ... Laminate roll, 5, 5A, 5B, 5C, 5D, 5E ... Fluid chamber, 5a ... Top of cylinder part Plate, 5a1... First region (opposing surface), 5a2... Second region (opposing surface), 5a2 ′... Curved portion of the second region, 5a2 ″... Straight portion (perpendicular) of the second region, 5a2 '' '... Linear part (inclined line) of the second region, 5a3 ... Upper end surface, 5b ... Side surface (side plate), 5c ... Bottom plate, 5d ... Internal channel, 5e ... Channel in the end region in the width direction, 5f ... separate flow path, 5g ... roller, 6 ... compressor, 7 ... fluid providing section, 8A ... first heating section, 8B ... second heating section, 9 ... third heating section, 10, 10A, 10B, 10C, 10E ... Manufacturing equipment, fd ... Fluid, K ... Space, S ... Gap, p ... Fluid pressure, fl ... Molten resin, FL ... Resin coating, BP ... Substrate

Claims (34)

The molten resin extruded downward from the outlet opened on the lower end surface of the die is sandwiched between a pair of laminating rolls that are positioned below the outlet together with a metal substrate, and the molten resin is cooled and solidified. An apparatus for manufacturing a resin-coated substrate for manufacturing a resin-coated substrate obtained by coating a resin film on the surface of a substrate,
The manufacturing apparatus includes a pre-roll between the outlet and the laminate roll, the molten resin extruded from the outlet is grounded to the pre-roll, and then sent between the pair of laminate rolls. A fluid chamber for providing fluid to a space between the outlet and the pre-roll below the outlet;
The fluid chamber has a facing surface facing the space and the pre-roll,
The fluid provided from the fluid chamber pushes back the molten resin present in the space is displaced in the rotation direction of the pre-roll and is taken up while flowing to the die side through the fluid flow path along the facing surface. An apparatus for producing a resin-coated substrate, which is adapted to apply fluid pressure in a direction.   There are two dies, and there is the pre-roll below each die, and the molten resin extruded downward from the outlet of each die contacts the corresponding pre-roll, and then both molten resins sandwich the substrate. The apparatus for manufacturing a resin-coated substrate according to claim 1, wherein the apparatus is sandwiched between a pair of laminate rolls in a posture.   3. The resin-coated substrate according to claim 1, wherein the fluid chamber is provided with a first heating unit for heating the fluid to adjust its temperature and generating a fluid whose temperature is adjusted. Manufacturing equipment.   The apparatus for producing a resin-coated substrate according to claim 1 or 2, wherein the pre-roll is provided with a second heating unit for adjusting the temperature of the pre-roll by heating.   The third heating unit is provided between the pre-roll and the pair of laminate rolls, and a third heating unit is provided in a conveyance path that contacts the pre-roll and sends the molten resin downward. Production equipment for resin-coated substrates. The opposing surface is composed of a first region having a shape complementary to the roll surface of the pre-roll, and a second region bent from the first region to the outlet side of the die and reaching the upper end surface of the fluid chamber. ,
The fluid channel includes a first channel between the first region and the molten resin on the roll surface, and a second channel between the second region and the molten resin in the space below the outlet. Consisting of
The apparatus for producing a resin-coated substrate according to any one of claims 1 to 5, wherein a cross-sectional width of a first flow path continuous with the second flow path is narrower than an internal flow path of the fluid chamber. . The upper end surface of the fluid chamber forms a flat surface,
The radius of curvature of the second region of the opposing surface increases toward the intersection with the upper end surface;
The molten resin extruded from the outlet, while receiving the fluid pressure, reaches the roll surface so as to extend along the second region via the second flow path after extending into the space below, The apparatus for manufacturing a resin-coated substrate according to claim 6, wherein the apparatus is in close contact with the roll surface along the first region via the first flow path. The second region is orthogonal to the upper end surface;
The molten resin extruded from the outlet extends vertically downward in the space while receiving the fluid pressure, and then reaches the roll surface along the second region via the second flow path. The apparatus for manufacturing a resin-coated substrate according to claim 7, wherein the apparatus is in close contact with the roll surface along the first region via the first flow path.   9. The second region has a curved portion that bends from the first region to the outlet side of the die, and a straight portion that is continuous with the curved portion and orthogonal to the upper end surface. Manufacturing equipment for resin-coated substrates.   The second region is a curved portion that bends from the first region to the outlet side of the die, and a direction in which the flow passage cross section of the second flow passage is enlarged continuously from the curved portion and is away from the outlet. The apparatus for manufacturing a resin-coated substrate according to claim 7, wherein the apparatus has a linear portion that inclines in a direction and intersects the upper end surface. Both the lower end surface of the die facing the outlet and the upper end surface of the fluid chamber form a flat surface,
Between the upper end surface of the fluid chamber and the lower end surface of the die, a fluid channel extending along the facing surface extends to further form a third channel,
11. The resin-coated substrate according to claim 6 , wherein the fluid that has flowed through the third flow path is discharged in a downstream direction having a larger flow path cross section than the third flow path. manufacturing device.   The apparatus for producing a resin-coated substrate according to claim 11, wherein the flow path cross-sectional area of the third flow path is adjusted so that the fluid pressure in the third flow path is greater than atmospheric pressure. The apparatus for producing a resin-coated substrate according to any one of claims 6 to 10 , wherein a flow path resistance of the first flow path is 0.3 times or more of a flow path resistance of the second flow path.   A fluid chamber is provided with at least two kinds of fluid pressure fluids, and the fluid pressure of the fluid provided from the widthwise end region of the fluid chamber is the fluid pressure of the fluid provided from the inner region thereof. The apparatus for producing a resin-coated substrate according to any one of claims 1 to 13, wherein the apparatus is adjusted to a relatively high pressure as compared with the above. The fluid chamber is composed of an internal flow path and a cylindrical portion around the internal flow path,
The internal flow path communicates with the opening facing the facing surface, and a part of the end surface of the cylindrical portion is the second region of the facing surface,
In the width direction end region of the cylindrical portion, an opening facing a part of the end surface of the cylindrical portion and a separate flow path communicating with the opening are formed.
This flows through the fluid flow path from the internal flow path of the fluid chamber is provided fluid, and, according to any of claims 6-10 wherein the further fluid in the fluid flow path from the separate flow path is provided Manufacturing equipment for resin-coated substrates.   The apparatus for producing a resin-coated substrate according to claim 15, wherein the temperature of the fluid provided from the separate flow path is higher than the temperature of the fluid flowing through the fluid flow path. The fluid chamber is composed of an internal flow path and a cylindrical portion around the internal flow path,
Rollers attached to the two side surfaces in a width direction of the tubular portion, one of the claims 6-10 said rollers to ensure rotatably contact with the flow path cross-sectional width of at least the first flow path to the pre-rolls An apparatus for producing a resin-coated substrate according to claim 1. The molten resin extruded downward from the outlet opened on the lower end surface of the die is sandwiched between a pair of laminating rolls that are positioned below the outlet together with a metal substrate, and the molten resin is cooled and solidified. A method for producing a resin-coated substrate for producing a resin-coated substrate obtained by coating a resin film on the surface of a substrate,
There is a pre-roll between the outlet and the laminating roll, and in the process of grounding the molten resin extruded from the outlet to the pre-roll and then sending the molten resin between a pair of laminating rolls, the outlet and the outlet The fluid is supplied to the space between the pre-rolls below, and the fluid flows on the die side via the fluid flow path along the space facing the pre-roll and the space of the fluid chamber, and exists in the space. The molten resin is grounded to the pre-roll while applying fluid pressure in a direction to push back the molten resin to be displaced in the pre-roll rotation direction, and then the molten resin and the substrate are sandwiched between the laminate rolls. Manufacture of a resin-coated substrate for manufacturing a resin-coated substrate in which a molten resin is cooled and solidified to cover the surface of the substrate with a resin coating Law.   There are two dies, and there is the pre-roll below each die, and the molten resin extruded downward from the outlet of each die contacts the corresponding pre-roll, and then both molten resins sandwich the substrate. The method for producing a resin-coated substrate according to claim 18, wherein the pressure is sandwiched between the pair of laminate rolls in a posture.   The method for producing a resin-coated substrate according to claim 18 or 19, wherein the fluid is heated to adjust its temperature, and the heated temperature-controlled fluid is provided from the fluid chamber to the space.   The method for producing a resin-coated substrate according to claim 18 or 19, wherein the pre-roll is heated to adjust the temperature of the surface, and the molten resin is grounded to the heated pre-roll surface.   The molten resin that is between the pre-roll and the pair of laminate rolls and is grounded to the pre-roll and sent downward, and the heated molten resin is sent to the pair of laminate rolls. The manufacturing method of the resin-coated board | substrate of description. The opposing surface is composed of a first region having a shape complementary to the roll surface of the pre-roll, and a second region bent from the first region to the outlet side of the die and reaching the upper end surface of the fluid chamber. ,
The fluid channel includes a first channel between the first region and the molten resin on the roll surface, and a second channel between the second region and the molten resin in the space below the outlet. Consisting of
The method for producing a resin-coated substrate according to any one of claims 18 to 22, wherein a channel cross-sectional width of the first channel continuous to the second channel is narrower than that of the internal channel of the fluid chamber. . The upper end surface of the fluid chamber forms a flat surface,
The radius of curvature of the second region of the opposing surface increases toward the intersection with the upper end surface;
While applying the fluid pressure to the molten resin extruded from the outlet, the molten resin is extended to the lower space and then along the second region via the second flow path. 24. The method for manufacturing a resin-coated substrate according to claim 23, wherein the resin-coated substrate is brought into close contact with the roll surface so as to reach the roll surface along the first region via the first flow path. The second region is orthogonal to the upper end surface;
While applying the fluid pressure to the molten resin extruded from the outlet, the molten resin extends along the second region through the second flow path after extending in the space vertically downward. 25. The method for producing a resin-coated substrate according to claim 24, wherein the method reaches the roll surface and adheres closely to the roll surface along the first region via the first flow path.   The said 2nd area | region has a curved part which bends | curves from the 1st area | region to the said exit side of die | dye, and a linear part which is orthogonal to the said upper end surface following this curved part. Manufacturing method of resin-coated substrate. The second region is a curved portion that bends from the first region to the outlet side of the die, and a direction in which the flow passage cross section of the second flow passage is enlarged continuously from the curved portion and is away from the outlet. 27. The method for producing a resin-coated substrate according to any one of claims 23 to 26 , wherein the resin-coated substrate has a linear portion that inclines in a direction and intersects the upper end surface. Both the lower end surface of the die facing the outlet and the upper end surface of the fluid chamber form a flat surface,
Between the upper end surface of the fluid chamber and the lower end surface of the die, a fluid channel extending along the facing surface extends to further form a third channel,
The resin coating according to any one of claims 23 to 27, wherein a fluid is caused to flow in a third flow path after the second flow path, and the fluid is discharged in a downstream direction having a larger cross section of the flow path than the third flow path. A method for manufacturing a substrate.   29. The method for producing a resin-coated substrate according to claim 28, wherein the flow path cross-sectional area of the third flow path is adjusted so that the fluid pressure in the third flow path is greater than atmospheric pressure.   30. The method for producing a resin-coated substrate according to any one of claims 23 to 29, wherein the flow path resistance of the first flow path is adjusted to 0.3 times or more of the flow path resistance of the second flow path.   A fluid chamber is provided with at least two fluid pressure fluids, and the fluid pressure of the fluid provided from the widthwise end region of the fluid chamber is set to the fluid pressure of the fluid provided from the inner region. The method for producing a resin-coated substrate according to any one of claims 18 to 30, wherein the resin-coated substrate is adjusted so as to have a relatively high pressure as compared with the above. The fluid chamber is composed of an internal flow path and a cylindrical portion around the internal flow path,
The internal channel communicates with the opening facing the opposing surface, and a part of the end surface of the cylindrical portion is the second region of the opposing surface,
In the width direction end region of the cylindrical portion, an opening facing a part of the end surface of the cylindrical portion and a separate flow path communicating with the opening are formed.
The resin according to any one of claims 23 to 30 , wherein a fluid is supplied from the internal flow path of the fluid chamber to flow to the fluid flow path, and further the fluid is supplied from the separate flow path to the fluid flow path. A method for producing a coated substrate.   The method for producing a resin-coated substrate according to claim 32, wherein the temperature of the fluid provided from the separate flow path is set higher than the temperature of the fluid flowing through the fluid flow path. The fluid chamber is composed of an internal flow path and a cylindrical portion around the internal flow path,
Rollers attached to the two side surfaces in a width direction of the tubular portion, one of the claims 23 to 30 with the roller contacts rotatably on the pre-roll to guarantee the passage cross-sectional width of at least the first flow path A method for producing a resin-coated substrate according to claim 1.

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