JP2011235279A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating apparatus that can facilitate preparation work and provides a flat and smooth coating surface when laminate products are produced using a two-liquid-curing non-solvent type adhesive.SOLUTION: The coating apparatus is provided with one die coater 5 that is provided facing a conveyer line 10 for conveying a web 2 and has a pair of slit-like outlets 6a and 6b and a pair of inlets 7a and 7b being in individual communication with the slit-like outlets 6a and 6b, a first supply means 40 at the inlet 7a of the inlet pair for supplying a first liquid 8 for the formation of an adhesive, and a second supply means 60 at the other inlet 7b of the inlet pair for supplying a second liquid 9 for the formation of the adhesive through contact with the first liquid 8, wherein the die coater 5 is disposed so that the outlets 6a and 6b are separated from each other and are adjacent to the web conveying direction A of the conveyer line 10, by which the first liquid 8 and the second liquid 9 are caused to come into contact with each other immediately after they are discharged from the outlets 6a and 6b, respectively.

Description

  The present invention relates to a coating apparatus that uses a two-component curable and non-solvent type adhesive to produce a laminate product by bonding sheet-like webs that are base materials together.

  Conventionally, a method of applying a solventless adhesive to a laminate web using a plurality of coating rolls (see, for example, Patent Document 1), or a first component of a solventless adhesive with a first die coater And a method of producing a composite film by applying a second component of a solventless adhesive to a film with a second die coater (see, for example, Patent Document 2).

JP 58-61874 A JP 2001-164229 A

  By the way, in the case of the method described in the above-mentioned Patent Document 1, as shown in FIG. The curing agent is separately supplied to the dam 110 and both are brought into contact with each other, and an adhesive formed by the contact is applied between the pair of first roll 101 and second roll 102, and one of the second rolls is further provided. 102 is supplied to another third roll 103 and supplied to a base material 105 which is fed between the fourth roll 104 and the fourth roll 104 in contact with the other third roll 103, and a pair of base materials 105 having the adhesive is provided. To the laminating unit 109 composed of a roll of the same, and another base material 106 sent to the laminating unit 109 through another line and the base material 105 having the adhesive are pressure-bonded by the laminating unit 109, Laminate product 107 formed by bonding the wood is produced. The adhesive used for the bonding is not cured when the main agent and the curing agent are separate from each other, but is cured and allowed to adhere after a predetermined time has elapsed after contacting the two.

  However, the method according to Patent Document 1 has the following problems. That is, when the adhesive is applied to the base material 105 sent between the third roll 103 and the fourth roll 104, the coating liquid is torn between the base material 105 side and the third roll 103 side. It was inevitable that the coated surface became skin-like due to this. In particular, when an adhesive having a high molecular weight is used to increase heat resistance, the yuzu skin appears more prominently due to an increase in coating viscosity. Further, when the transfer speed is increased in this state, there is a problem that orange peel occurs after bonding. Furthermore, when the viscosity of the adhesive is lowered in order to prevent the coated surface from being roughened, there is a problem that the initial tack force is lowered and adhesion failure such as tunneling occurs. Furthermore, when the apparatus is stopped to change the width size of the laminated product, the adhesive is solidified in the passage inside the dam because the two liquids are in contact with each other in the dam 110, so that the width of the laminated product is reduced. There was also a problem that it took a long time for preparation work such as size change.

  In addition, when coating is performed by the roll coating method disclosed in Patent Document 1, if the viscosity of the coating liquid is low, the coating liquid cannot be lifted by the roll, and the amount of liquid applied to the web Since it is difficult to sufficiently secure the coating viscosity, for example, there is a problem that a coating liquid having a liquid viscosity of 500 Pas (cps) or less cannot be used.

  On the other hand, the method of Patent Document 2 has the following problems. That is, after the first layer composed of the first component is applied to the film, the outer surface of the first layer (the two-liquid contact surface) is once between the second layer composed of the second component and the film. There is a risk of air entrainment due to exposure to air. Also, if the die lip is brought close to the coating surface in order to thinly coat the second coating layer, the first layer coating liquid may be scraped off by the second layer lip. If dropped, there is also a problem that the coated surface becomes rough. Furthermore, in general, it is necessary to frequently change the coating width of a coating apparatus for laminate products. Therefore, when two die coater heads are provided, the two die coater heads are respectively replaced to reduce the coating width. There is a problem that it is necessary to perform a resize work to be changed, and the preparation work takes a long time.

  The present invention has been made to solve the above-described problems caused by the prior art. When a laminate product is manufactured using a two-component curable solventless adhesive, preparation work can be easily performed. Another object of the present invention is to provide a coating apparatus that can smooth the coated surface.

  The coating apparatus of the present invention is a coating apparatus in a laminator that uses a two-component curable and solvent-free adhesive to produce a laminate product by bonding together sheet-like webs that are base materials. One die coater provided with a pair of slit-shaped outlets and a pair of inlets respectively communicating with the outlets, each of which is provided facing a conveying line on which one of the webs is conveyed; On the one hand, a first supply means for supplying a first liquid for forming the adhesive and a second for forming the adhesive on the other of the pair of inlets by contacting the first liquid A second supply means for supplying a liquid, and the die coater is disposed such that the pair of outlets are separated from each other, and the pair of outlets are adjacent to each other in the web conveyance direction in the conveyance line, Serial first liquid and the second liquid, characterized in that to phase contact immediately after fed from the outlet.

  In the case of the present invention, the first liquid and the second liquid are separately supplied from the two outlets of the die coater to the web conveyed on the conveyance line. Then, the liquid supplied from the outlet on the downstream side in the transport direction is overlaid on the liquid supplied from the outlet on the upstream side in the transport direction, and both liquids come into contact with each other. Another web is bonded to the web coated with, thereby producing a laminate product. As described above, since the first liquid and the second liquid are supplied separately from the two inlets to the outlets of the die coater, the die coater can be used even if the operation is temporarily stopped due to size change or the like. In the first supply means and the second supply means for supplying the first liquid and the second liquid separately to the inside of the container, both the liquids are not in contact with each other, so that the hardened adhesive does not exist in the inside. It is possible to easily perform preparatory work when changing the coating width. In addition, since the liquid is applied to the web from the two outlets of the die coater, the coating liquid is not torn between the web and the roll as in the conventional example of FIG. can do. Furthermore, the occurrence of orange peel can be prevented.

  In this coating apparatus, an outlet on the upstream side in the transport direction is used to supply a liquid with a large supply amount of the first liquid and the second liquid, and a downstream outlet is used to supply a liquid with a small supply amount. It can be configured. In this configuration, a thick first liquid layer with a large supply amount can be formed on the web first, and then a thin second liquid layer with a small supply amount can be formed thereafter. Thus, air entrainment can be suppressed. That is, when the second liquid layer is formed by forming a thick first liquid layer on the outlet side upstream in the web conveyance direction and closing the gap on the upstream side in the conveyance direction between the die coater and the web. Air entrainment can be made difficult to occur.

  In this coating apparatus, the upstream outlet in the transport direction is used for supplying a liquid having a high viscosity among the first liquid and the second liquid, and the downstream outlet is used for supplying a lower viscosity. can do. In the case of this configuration, the first liquid layer having a high viscosity is formed on the web first, and the first layer becomes stable, and then the second liquid layer having a low viscosity is easily and appropriately formed. It can be formed by laminating.

  In this coating apparatus, an upstream outlet in the transport direction is used for supplying a low-viscosity liquid among the first liquid and the second liquid, and a downstream outlet is used for supplying a high-viscosity liquid. can do. In this configuration, the wettability of the coating liquid with respect to the web can be improved. Here, the wettability represents the ease of coating when the coating solution is uniformly applied to the entire web, and generally the coating solution having a lower viscosity is higher than the coating solution having a higher viscosity. Also has good wettability. Therefore, when forming a two-layer coating layer, it is possible to improve the wettability of the coating liquid to the web by applying a low-viscosity liquid to the side in contact with the web (first). become.

  In this coating apparatus, a vacuum chamber may be provided on the upstream side of the outlet provided on the upstream side in the transport direction. In the case of this configuration, air can be prevented from being mixed into the liquid applied to the web by the vacuum chamber.

  In this coating apparatus, it is preferable that the die edges at the outlet for supplying the first liquid and the outlet for supplying the second liquid are both formed to have a radius of curvature of 100 μm or less. In this configuration, since the die edge is relatively sharp, the coated surface can be smoothed to prevent air bubbles from being mixed. This is particularly effective when laminating a web with little or no air permeability. In addition, since the sharply formed die edge is located at a position where the web is separated from the die coater, the adhesive is easily broken and the adhesive is prevented from flowing to the die coater side.

  Furthermore, the radius of curvature of the die edge is preferably 30 μm or more. The reason is that although there is no problem in coating, there is a problem that the die edge is likely to be chipped during processing if the radius of curvature is too small.

  In this coating apparatus, each of the first supply unit and the second supply unit may be provided with a temperature adjustment unit that adjusts the liquid temperature. In this configuration, when the viscosities of the first liquid and the second liquid are different, the viscosity of both liquids can be adjusted to the same level by adjusting one liquid temperature or both liquid temperatures. Therefore, there is an advantage that the mixing accompanying the contact of both liquids can be facilitated.

  In this coating apparatus, the die coater includes adjusting means for adjusting the slit length at both ends in the slit longitudinal direction at each outlet, and each adjusting means includes a slit connected to the corresponding outlet and a liquid reservoir connected to the slit. A slit length adjusting piece that is slidable in the slit longitudinal direction and has a slit moving part that moves the slit and a liquid reservoir moving part that moves a part of the liquid reservoir; and the liquid reservoir A fixed piece for moving the remaining space in the slit longitudinal direction and fixing the slit length adjusting piece, and the fixed piece is pushed inward from the outside in the slit longitudinal direction to the slit length. It can be set as the structure which has the taper-shaped pressing surface which presses the said liquid pool movement part in a thickness adjustment piece to the said liquid pool.

  In this configuration, when adjusting the slit length (coating width), the fixed piece is moved in the pulling direction from the inside to the outside in the slit longitudinal direction, so that the tapered fixed piece is adjusted for the slit length. The force that presses the liquid pool moving part of the piece against the liquid pool is released, and the slit length adjusting piece is loosely fixed. Thereafter, the slit length adjusting piece is slid along the slit longitudinal direction, and after the slit length adjusting piece has moved to a predetermined position, the fixed piece is pushed inward from the outside in the slit longitudinal direction. Along with this, the taper-shaped pressing surface of the fixed piece pushes the slit length adjusting piece toward the slit, so that the fixed piece presses the liquid reservoir moving part of the slit length adjusting piece against the liquid reservoir, and the slit length adjusting piece is Can be fixed. Therefore, the slit length can be easily adjusted by fixing the slit length adjusting pieces at predetermined positions on both sides of the slit-shaped outlet. In addition, although the fixed piece and the slit length adjusting piece move in the longitudinal direction of the slit in this way, the liquid pool moving part of the fixed piece and the slit length adjusting piece is slidably prevented by the liquid pool, so that The characteristics are greatly improved. Note that the slit length adjustment piece also has a tapered pressing surface opposite to the pressing surface of the fixed piece, so that the gap between the slit length adjustment piece and the fixed piece is reduced. This can improve the sealing performance.

  In this coating apparatus, it is preferable that the total layer thickness of the layer made of the first liquid and the layer made of the second liquid applied to the web is 0.7 μm or more and 5 μm or less. That is, by making the total layer thickness 0.7 μm or more in this way, it is possible to ensure the adhesive force required for bonding the two webs. On the other hand, by making the total layer thickness 5 μm or less, adhesion can be performed while reducing the excess layer thickness in a state where the unevenness formed by printing on the web can be absorbed.

  In this coating apparatus, a back-up roll made of a rubber roll is provided on the web conveyance line, and at least a tip surface portion of a die head located on the downstream side of the outlet on the downstream side in the conveyance direction among the two outlets is provided on the peripheral surface. You may install in the state contact | abutted. According to this configuration, even if the roundness of the backup roll is inaccurate, by elastically deforming the backup roll, a large gap is formed between the tip surface portion of the die head and the peripheral surface of the backup roll at the time of rotation. Or the tip surface portion of the die head can be effectively pressed against the peripheral surface of the backup roll and the film thickness of the coating liquid can be effectively prevented from occurring. The coating film thickness can be set uniformly.

  In the case of the present invention, since the first liquid and the second liquid are separately supplied separately from the two outlets of the die coater to each of the inlets, in order to change the coating width Even if the operation is once stopped, the inside of the die coater and the first supply means and the second supply means for supplying the first liquid and the second liquid separately to the die coater are hardened because both liquids are not in contact with each other. Since the agent does not exist inside, it is possible to easily perform the preparation work. Moreover, since the liquid is applied to the web from the two outlets of the die coater, the coating liquid is prevented from being torn by the web and the roll as in the conventional example of FIG. 7, and the coated surface is smoothed. Can be. Furthermore, the occurrence of orange peel can be prevented.

It is a mimetic diagram showing the coating device concerning a 1st embodiment of the present invention. It is a figure which shows the principal part in the coating apparatus of FIG. It is a figure which shows the vicinity part of the die-coater in the coating apparatus of FIG. It is a figure which expands and shows the die head in the die coater of FIG. It is a figure which shows the adjustment means which adjusts the slit length with which the die-coater was equipped, (a) is a front view, (b) is a side view. It is the FIG. 3 equivalent view which shows the coating apparatus which concerns on 2nd Embodiment of this invention. It is an enlarged view which shows the front-end | tip part shape of the die-coater in the coating apparatus of FIG. It is explanatory drawing of the technique of patent document 1. FIG.

  Embodiments of the present invention will be specifically described below. FIG. 1 is a schematic view showing a laminator having a coating apparatus according to the first embodiment of the present invention, and FIG. 2 is a view showing a coating apparatus provided in the laminator.

  This laminator 80 is a two-component curable type and uses a solvent-free type adhesive, and laminates a sheet-like web as a base material to produce a laminated product. Specifically, the 1st conveyance line 10 which conveys the 1st web 2, the 2nd conveyance line 20 which conveys the 2nd web 3, the 1st web 2 and the 2nd conveyance which are conveyed on the 1st conveyance line 10 A pair of slit-shaped outlets are provided so as to face the first transport line 10 and a third transport line 30 that transports the laminated product 4 bonded to the second web 3 transported through the line 20 by an adhesive. One die coater 5 having a pair of inlets 7a and 7b each having 6a and 6b and individually communicating with each outlet 6a and 6b, and a first liquid 8 for forming an adhesive are supplied to the die coater 5. First supply means 40 and second supply means 60 for supplying the second liquid 9 for forming the adhesive to the die coater 5 by being brought into contact with the first liquid 8 are also provided. Here, the die coater 5, the 1st supply means 40, and the 2nd supply means 60 comprise the coating device 1 which concerns on this embodiment.

  The first transport line 10 includes an unwinding portion 12 in which two unwinding rolls 11 around which the first web 2 is wound and a first web 2 unrolled from one unwinding roll 11 of the unwinding portion 12. And a plurality of rollers 13 that guide to the third transport line 30 through the die coater 5. A backup roll 13 a that sandwiches the first web 2 with the die coater 5 is provided at a position corresponding to the die coater 5.

  The second transport line 20 includes an unwinding unit 22 in which two unwinding rolls 21 around which the second web 3 is wound and a second web 3 unrolled from one unwinding roll 21 of the unwinding unit 22. And a plurality of rollers 23 for guiding to the third transport line 30. A laminating unit 24 having a plurality of (three in the illustrated example) rolls is provided at the end of the first conveying line 10 and the second conveying line 20. 2 The web 3 is bonded.

  The third transport line 30 includes a plurality of rollers 31 that guide the laminated product 4 that has been bonded together, and a winding unit 32 that winds up the laminated product 4 that has passed through the plurality of rollers 31.

  The first supply means 40 includes a tank 41 for storing the first liquid 8, a pipe 42 whose both ends are connected to the tank 41 and the inlet 7 a, and a pump 43 provided in the middle of the pipe 42.

  The second supply means 60 includes a tank 61 that stores the second liquid 9, a pipe 62 having both ends connected to the tank 61 and the inlet 7 b, and a pump 63 provided in the middle of the pipe 62.

  The die coater 5 has a pair of slit-shaped outlets 6a and 6b and a pair of inlets 7a and 7b communicating with the outlets 6a and 6b, respectively. The inlet 7a communicates with the outlet 6a, and the inlet 7b communicates with the outlet 6b. ing. The first liquid 8 is introduced into the inlet 7a, and the first liquid 8 is led out from the outlet 6a and applied to the portion of the first web 2 between the backup roll 13a. On the other hand, the second liquid 9 is introduced into the inlet 7b, and the second liquid 9 is led out from the outlet 6b and applied to the portion of the first web 2.

  The first liquid 8 and the second liquid 9 correspond to, for example, a polyol compound having a polyol such as polyether polyol, polyether polyurethane polyol, polyester polyol, polyester polyurethane polyol, or an isocyanate compound. Furthermore, at least one of the first liquid 8 and the second liquid 9 may contain an adhesion promoter such as a silane coupling agent, a titanate coupling agent, phosphoric acids and phosphoric esters. As a first example, an isocyanate compound having a temperature of 40 ° C. (viscosity of 4400 Pas) was used for the first liquid 8, and a polyol compound having a temperature of 20 ° C. (viscosity of 3150 Pas) was used for the second liquid 9. In the second embodiment, fatty acid polyisocyanate was used for the first liquid 8. The viscosity is 1420 Pas at 70 ° C., 780 Pas at 80 ° C., and 480 Pas at 90 ° C. On the other hand, polyester polyurethane polyol was used for the second liquid 9. Its viscosity is 3800 Pas at 70 ° C., 1600 Pas at 80 ° C., and 840 Pas at 90 ° C.

  The die coater 5 is provided with a temperature adjusting means for adjusting the liquid temperature. Specifically, the temperature adjusting means includes a plurality (three in the illustrated example) of water supply ports 51a, 51b, 51c opened on the outer surface (side surface) of the die coater 5, and the same number of drain ports 52a, 52b, 52c. The hot water is supplied to the internal passages of three systems (not shown) and the water supply ports 51a to 51c via the pipes 53a, 53b, and 53c, and after passing through the internal passages, the pipes 54a, 54b, And hot water circulators 55a, 55b, 55c that are returned via 54c. Each of the three internal passages is a passage provided inside the die coater 5 and communicates with the water supply port 51a and the drainage port 52a provided together on the side surface of the die coater 5. The hot water that has entered the inside of the die coater 5 from the mouth 51a or the like is then discharged from the drain port 52a or the like by reciprocating a plurality of times, for example, twice, along the slit longitudinal direction B described later. Each of the hot water circulators 55a to 55c includes a heater (not shown) that heats the temperature of the hot water to a desired temperature.

  Adjustment of the liquid temperature at the die coater 5 by the temperature adjusting means having such a configuration is as follows. For example, a first system that includes a drain port 52a similar to the water supply port 51a provided near the inlet 7a and a hot water circulator 55a that circulates hot water to these outlets is used for the first liquid 8 supplied to the inlet 7a. Adjust the temperature. Moreover, the 2nd system | strain including the drain port 52b similar to the water supply port 51b provided near the inlet 7b, and the warm water circulator 55b which circulates warm water with respect to these is the 2nd system | strain of the 2nd liquid 9 supplied to the inlet 7b. Adjust the temperature. A third system including a drain port 52c similar to a water supply port 51c provided near an intermediate position between the inlet 7a and the inlet 7b and a hot water circulator 55c for circulating hot water thereto is supplied to the inlet 7b. The temperature of the second liquid 9 is adjusted. Note that the third system may be configured to adjust the temperature of the first liquid 8 instead of the temperature of the second liquid 9. Moreover, in this example, although it is set as the structure provided with three of the 1st-3rd systems, it is good also as a structure provided with the arbitrary number of systems.

  A vacuum chamber 59 is provided on the upstream side in the web conveyance direction A of the die coater 5. This vacuum chamber 59 surrounds the periphery of the outlets 6a and 6b of the die coater 5 and depressurizes the inside thereof, whereby the air to the first liquid 8 and the second liquid 9 led out from the outlets 6a and 6b is obtained. Suppress entrainment. Reference numeral 66 in FIG. 2 denotes a vacuum pump.

  FIG. 3 is a view showing the vicinity of the die coater 5, and FIG. 4 is an enlarged view showing the die head 5a. In FIG. 3, the vacuum chamber 59 is omitted. The die head 5a of the die coater 5 is provided with the pair of outlets 6a and 6b separated from each other. And this pair of exit 6a, 6b is arrange | positioned so that the conveyance direction A of the 1st web 2 in the 1st conveyance line 10 may be adjoined, and the 1st liquid 8 and the 2nd liquid 9 are sent from each exit 6a, 6b. Immediately after being derived, phase contact is made.

  Further, the die head 5a is provided with a die edge 56a related to the upstream outlet 6a in the transport direction A and a die edge 56b related to the downstream outlet 6b in the transport direction A, and each die edge 56a, 56b is It is relatively sharp. Specifically, both the die edges 56a and 56b have a radius of curvature of 100 μm or less, and in this embodiment, 60 μm. The die edge 56a is an upstream edge of the downstream outlet 6b, and the die edge 56b is a downstream edge of the die head 5a.

  The reason why the radii of curvature of the die edges 56a and 56b are defined in this way is to smooth the coated surface and prevent air bubbles from entering the coated portion of the adhesive. In particular, when laminating a web with little or no air permeability, it is effective because it is possible to prevent bubbles from being mixed. Furthermore, the radius of curvature of the die edges 56a and 56b is preferably 30 μm or more. The reason is that although there is no problem in coating even if the radius of curvature is small, there is a problem that if the radius of curvature is too small, the die edge is likely to be chipped during processing.

  In order to suppress the occurrence of chipping of the die edges 56a and 56b, it is preferable to use a hard metal material such as SUS420J-2 as the material of the die head 5a. In addition, the die edges 56a and 56b are heat treated to increase the hardness. Further, by setting the lip length L1 of the die head 5a to about 35 mm, and the width L2 of the slit connected to the outlet 6a and the width L3 of the slit connected to the outlet 6b to 200 μm, liquid flow unevenness occurs. It suppresses to make the coated surface smooth.

  Further, the upstream end portion 50 (see FIG. 4) of the die head 5a located on the upstream side in the web conveyance direction A is formed in a smooth curved surface so that wrinkles are not easily generated in the first web 2. Moreover, in order to make the 1st web 2 slip easily, it is finished in the mirror surface. Further, the die coater 5 is provided with adjusting means for adjusting a slit length (coating width) described later.

  In the coating apparatus 1 of the present embodiment configured as described above, the first web 2 conveyed along the first conveyance line 10 is led out from the two outlets 6a and 6b of the die coater 5. In addition, the first liquid 8 and the second liquid 9 are supplied separately. Then, on the first liquid 8 supplied to the first web 2 from the outlet 6a located on the upstream side in the web conveying direction A, the second liquid led out from the outlet 6b located on the downstream side in the web conveying direction A. The second web 3 conveyed through the second conveying line 20 is bonded to the first web 2 on which the two liquids 8 and 9 are applied by being overlapped with each other. It is transported along the transport line 30.

  Since the first liquid 8 and the second liquid 9 are separately supplied separately from the two inlets 7a, 7b of the die coater 5 to the outlets 6a, 6b as described above, the size can be changed. Even if the operation is temporarily stopped due to the above, the inside of the die coater 5 and the first supply means 40 and the second supply means 60 for supplying the first liquid 8 and the second liquid 9 separately to the inside of the die coater 5 There is no adhesive in which the liquids 8 and 9 are brought into contact with each other and the preparation work such as the size change can be easily performed. Further, since the liquids 8 and 9 are applied to the web 2 from the two outlets 6a and 6b of the die coater 5, the coating liquid may be torn between the web and the roll as in the conventional example of FIG. The coated surface can be smoothed. Furthermore, the occurrence of orange peel can be prevented.

  Moreover, in the coating apparatus 1 of this embodiment, the supply amount of the 1st liquid 8 supplied from the exit 6a located in the upstream of the said web conveyance direction A is the exit 6b located in the downstream of the web conveyance direction A. The first liquid 8 having a large supply amount is first formed on the first web 2 by increasing the supply amount of the second liquid 9 from the second liquid 9, and thereafter A thin layer (second layer) of the second liquid 9 with a small supply amount can be formed, and thereby air entrainment to the coated portion of the adhesive can be suppressed. That is, by forming the thick first liquid 8 layer on the outlet 6a side that is located upstream of the first web 2 in the transport direction A, the gap between the die coater 5 and the first web 2 on the upstream side in the transport direction. By enclosing the air, it is possible to make it difficult for air to be entrained during the formation of the second liquid layer. At this time, the ratio of the discharge amount of the first liquid 8 and the discharge amount of the second liquid 9 is preferably about 5: 2 in the configuration of the coating liquid used in the first embodiment. In the configuration of the coating liquid used in the second embodiment, about 2: 1 is desirable.

  The total layer thickness of the first liquid 8 layer (first layer) and the second liquid 9 layer (second layer) is preferably 0.7 μm or more and 5 μm or less. That is, when the total layer thickness is 0.7 μm or more in this way, it is possible to ensure the adhesive force required for bonding the two webs. On the other hand, by making the total layer thickness 5 μm or less, adhesion can be performed while reducing the excess layer thickness in a state where the unevenness formed by printing on the web can be absorbed. Furthermore, the total layer thickness is desirably 1.2 μm or more and 3 μm or less. In other words, when the total layer thickness is 3 μm or less, the unevenness generated on the general web that is not printed can be absorbed, and when the thickness is 1.2 μm or more, adhesion unevenness is achieved. Can be prevented.

  In this case, when the viscosity of the first liquid 8 is higher than the viscosity of the second liquid 9, the first liquid 8 having a higher viscosity is discharged from the outlet 6 a located on the upstream side in the web conveyance direction A. The second liquid 9 having a lower viscosity is preferably discharged from the outlet 6b on the downstream side. The reason is that when the first liquid 8 layer having a high viscosity is formed first, the first layer is in a stable state, and then the second liquid 9 layer having a low viscosity is formed. It is because it can laminate | stack easily and appropriately. However, when there is a problem with the wettability of the coating liquid with respect to the first web 2, the wettability can be improved by applying the low-viscosity coating liquid first. That is, the coating property of the second coating liquid 9 can be improved by first coating the first liquid 8 with a smooth spread on the first web 2, and as a result, the first conveying line. 10 line speeds can be increased.

  Moreover, according to the die coater system which supplies the 1st liquid 8 and the 2nd liquid 9 directly with respect to the 1st web 2 as mentioned above, like the case where it coats with a roll coat system, liquid viscosity However, there is no problem that a coating liquid of 500 Pas (cps) or less cannot be used. For example, even a coating liquid of 500 Pas (cps) or less can be used.

  Furthermore, when the viscosity of the first liquid 8 and the viscosity of the second liquid 9 are different, when the viscosity of both the liquids 8 and 9 is to be equalized, the first liquid is adjusted by the temperature adjusting means provided in the die coater 5. What is necessary is just to warm and use at least one of 8 and the 2nd liquid 9. In addition, when the viscosity of both 8 and 9 is equalized in this way, there exists an advantage that the mixing accompanying the contact of the 1st liquid 8 and the 2nd liquid 9 can be made easy. In the coating liquid of the second embodiment, since the temperature of the fatty acid polyisocyanate that is the first liquid 8 is 70 ° C. and the viscosity is 1420 Pas, the temperature of the polyester polyurethane polyol of the second liquid 9 is adjusted to about 85 ° C. By doing so, the viscosity can be brought close to the viscosity of the first liquid 8.

  Furthermore, by operating a vacuum chamber 59 disposed upstream of the outlet 6a in the conveying direction A to evacuate the air in the die coater 5, the liquids 8 and 9 applied to the first web 2 are drawn. It is possible to suppress air from being mixed in.

  FIG. 5A is a front view schematically showing an adjusting means for adjusting the slit length, and FIG. 5B is a side view thereof. The adjusting means 70 is provided at both ends in the slit longitudinal direction B of the outlets 6a and 6b in the die coater 5, respectively. In addition, the dashed-two dotted line in Fig.5 (a) shows a liquid flow.

  Each adjusting means 70 includes a slit length adjusting piece 71 (a hatching portion that is lowered to the right) and a fixing piece 72 (a hatching portion that is raised to the right). The slit length adjusting piece 71 and the fixed piece 72 are provided so as to be slidable inside a liquid passage 73 formed in advance in the die coater 5. The liquid passage 73 has different grooves in the slit depth direction C, a slit 73a having a constant width connected to the outlet 6a (6b), and a substantially circular cavity on the inner side and connected to the slit 73a. A liquid reservoir 73b. The liquid pool 73b is for making the liquid flow uniform at each position of the slit 73a in the slit longitudinal direction B.

  The slit length adjusting piece 71 includes a slit moving part 71a that moves in the slit 73a along the slit longitudinal direction B, and a liquid having an arc-shaped cross section that moves part of the liquid reservoir 73b (a part near the slit 73a). And a pool moving part 71b. A flat pressed surface 71c is formed on the inner depth side of the liquid pool 73b in the liquid pool moving part 71b. The pressed surface 71c is located on the outer side of the slit longitudinal direction B on the outlet 6a ( It is formed in a tapered shape inclined so as to be close to 6b). The slit moving part 71a has a width dimension substantially equal to that of the slit 73a. The liquid pool moving part 71b has substantially the same cross-sectional shape as a part of the liquid pool 73b (the part near the slit 73a), and more than the slit moving part 71a in order to prevent the liquid pool moving part 71b from dropping out toward the outlet 6a (6b). Widely formed.

  The fixed piece 72 moves in the remaining space excluding the liquid pool moving part 71b from the internal cavity of the liquid pool 73b, and is formed in a cross-sectional shape in which a part of a circle is missing. Further, a flat pressing surface 72a is provided at the end of the fixed piece 72 so as to oppose the inclined pressed surface 71c of the slit length adjusting piece 71. The pressing surface 72a corresponds to the pressed surface 71c. It is formed in a taper shape that slopes outward. Therefore, the fixed piece 72 is pushed inward from the outside in the slit longitudinal direction B, thereby pushing the pressed surface 71c of the slit length adjusting piece 71 to the slit 73a side through the pressing surface 72a. The liquid reservoir moving part 71b of the thickness adjusting piece 71 is pressed against the liquid reservoir 73b and fixed at a predetermined position, and the coating width is regulated by the inner end of the slit length adjusting piece 71.

  Therefore, in the adjustment means 70 configured in this way, when adjusting the slit length (coating width), by moving the fixing piece 72 in the drawing direction from the inside to the outside in the slit longitudinal direction B, The tapered pressing surface 72a of the fixed piece 72 is separated from the pressed surface 71c, thereby releasing the force of pressing the liquid pool moving part 71b of the slit length adjusting piece 71 against the liquid pool 73b. It can be moved. Thereafter, the slit length adjusting piece 71 is slid along the slit longitudinal direction B, and after moving the slit length adjusting piece 71 to a predetermined position, the fixed piece 72 is pushed inward from the outside in the slit longitudinal direction B. In this way, by pressing the tapered pressing surface 72a of the fixed piece 72 against the pressed surface 71c of the slit length adjusting piece 71, the liquid pool moving part 71b is pressed against the liquid pool 73b and the slit length adjusting piece. 71 is fixed. Therefore, the slit length can be easily adjusted.

  Further, although the fixed piece 72 and the slit length adjusting piece 71 move in the slit longitudinal direction B in this way, the liquid pool moving part 71b of the fixed piece 72 and the slit length adjusting piece 71 is slidably removed by the liquid pool 73b. Since it is prevented, workability is greatly improved. Furthermore, since the pressed surface 71c of the slit length adjusting piece 71 and the pressing surface 72a of the fixed piece 72 are formed in a reverse taper shape, the sealing performance can be improved. Note that only the pressing surface 72a of the fixing piece 72 may be formed in a tapered shape, and even in that case, the slit length adjusting piece 71 can be fixed.

  As the backup roll 13a in the first embodiment, a metal roll mainly made of steel pipe material or a rubber roll provided with a synthetic rubber material layer on the outer peripheral surface can be used. When 13a is used, the roundness thereof can be ensured with high accuracy, so that it is possible to effectively suppress the occurrence of coating unevenness due to the vibration of the backup roll 13a.

  On the other hand, when a rubber roll rich in elasticity is used as the backup roll 13a, coating is performed with the tip of the die head 5a in contact with the peripheral surface of the backup roll 13a via the first web 2. By having such a configuration, there is an advantage that the first liquid 8 and the second coating liquid 9 can be uniformly applied to the first web 2.

  6 and 7 show a coating apparatus according to the second embodiment of the present invention. In the coating apparatus according to the second embodiment, a backup roll 13a made of a rubber roll is provided on the first conveyance line 10, and the tip surface portion of the die head 5a is in contact with the peripheral surface thereof. ing.

  Each edge except for the upstream tip 50 of the die head 5a located on the upstream side in the web conveyance direction A has a sharp shape without a rounded shape. An upstream edge 50a of the outlet 6a serving as a supply passage for the first liquid 8 is formed in a rounded shape having a radius of curvature set within a range of 30 to 100 μm at the upstream tip 50 of the die head 5a. ing.

  Between the upstream edge 50a of the outlet 6a and the downstream portion of the upstream tip 50 of the die head 5a located on the upstream side in the web conveyance direction A, that is, on the upstream side of the upstream edge 50a, The gap 57a between the upstream end and the backup roll 13a is set to about 25 μm, the gap 57b between the downstream end and the backup roll 13a is set to about 16 μm, and the length 57L is set to about 0.5 mm. A straight front end surface portion 57 is provided.

  Between the downstream edge 58a of the outlet 6a serving as the supply path for the first liquid 8 and the upstream edge 58b of the outlet 6b serving as the supply path for the second liquid 8, the upstream end, the backup roll 13a, The first front end surface portion of the linear shape in which the gap 64a is set to about 23 μm, the gap 64b between the downstream end thereof and the backup roll 13a is set to about 19 μm, and the length 64L is set to about 0.5 mm. 64 and a linear second front end surface portion 65 having a gap 65b between its downstream end and the backup roll 13a set to about 14 μm and a length 65L set to about 0.5 mm.

  Further, a gap 66a between the upstream end and the backup roll 13a is 22 μm between the downstream edge 65a of the outlet 6b serving as the supply passage for the second liquid 9 and the die edge 56b located downstream in the conveyance direction of the die head 5a. A straight first front end surface portion 66 having a gap between the downstream end thereof and the backup roll 13a set to substantially zero and a length 66L of about 0.5 mm, and an upstream end thereof. A linear second front end surface portion 67 in which the distance between the range of the length 67L from the back end to the downstream end (die edge 56b) and the backup roll 13a is set to 0, and the length 67L is set to about 0.5 mm. Is provided.

  Further, the slits connected to the outlet 6a and the outlet 6b formed in the die head 5a include wide upstream portions 68a and 69a having a groove width of about 200 μm, and a narrow downstream side portion having a groove width of about 20 μm. 68b and 69b are provided.

  As in the second embodiment, a backup roll 13a made of a rubber roll is provided on the first transport line 10, and the second tip surface portion 67 provided on the downstream side in the transport direction of the die head 5a, that is, the outlets 6a and 6b. Among these, at least the second tip surface portion 67 is set by setting the interval between the tip surface portion of the die head located at the downstream side portion of the outlet in the transport direction (outlet serving as the second liquid supply passage) 6 b and the backup roll 13 a to 0. In the coating apparatus according to the second embodiment that is configured to press contact with the peripheral surface of the backup roll 13a, even if the roundness of the backup roll 13a cannot be ensured with high accuracy, the die head 5a and When the film thickness of the coating liquid applied to the first web 2 conveyed between the backup roll 13a can be effectively uniformized Cormorants has the advantage.

  That is, when a rubber roll having high elasticity is used as the backup roll 13a and the second tip surface portion 67 of the die head 5a is pressed against the peripheral surface of the backup roll 13a, the roundness of the backup roll 13a is increased. Even if inaccurate, by elastically deforming the backup roll 13a, a large gap is formed between the front end surface portion of the die head 5a and the peripheral surface of the backup roll 13a during the rotation, or the front end surface portion of the die head 5a is backed up. Since it is possible to effectively prevent the occurrence of a situation in which the film thickness of the coating liquid is insufficient due to being firmly pressed against the peripheral surface of the roll 13a, the film of the coating liquid applied to the first web 2 The thickness can be set uniformly.

  Further, in the second embodiment using a rubber roll rich in elasticity as the backup roll 13a, each edge 58a, 58b, 65a, 56b excluding the upstream end portion 50 located upstream in the transport direction of the die head 5a, In the case of forming a sharp shape without a rounded shape, it is possible to prevent an excessive gap from being formed between the tip surface portion of the die head 5a and the peripheral surface of the backup roll 13a. Therefore, there is an advantage that a thin coating liquid layer can be formed on the first web 2 while suppressing an unnecessary increase in the film thickness of the coating liquid. It should be noted that there is no damage caused by the edges of the die head 5a formed in the sharp shape having no radius contacting the peripheral surface of the backup roll 13a comprising 58a, 58b, 65a, 56b and the rubber roll.

  Further, as shown in the second embodiment, the slits connected to the outlet 6a and the outlet 6b formed in the die head 5a have wide upstream portions 68a and 69a having a groove width of about 200 μm, and a groove width of about 20 μm. When the narrow downstream side portions 68b and 69b having the above are provided, the supply amounts of the first liquid 8 and the second liquid 9 supplied from the outlet 6a and the outlet 6b to the first web 2 are sufficiently large. A film of the coating liquid layer formed on the first web 2 while ensuring that a large amount of the first liquid 8 and the second liquid 9 are led out from the downstream side portions 68b and 69b at once. It is possible to effectively reduce the thickness.

DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 1st web 3 2nd web 4 Laminated product 5 Die coater 6, 6a, 6b Outlet 7, 7a, 7b Inlet 8 First liquid 9 Second liquid 40 First supply means 59 Vacuum chamber 60 Second supply Means 56a, 56b Die edge 70 Adjustment means 71 Slit length adjustment piece 72 Fixed piece

Claims (10)

A coating device in a laminator that uses a two-component curable and solvent-free adhesive to produce a laminate product by laminating sheet-like webs that are base materials,
One die coater provided with a pair of slit-shaped outlets and a pair of inlets individually communicating with each outlet, provided facing a conveyance line on which one of the webs is conveyed,
A first supply means for supplying a first liquid for forming the adhesive to one of the pair of inlets;
A second supply means for supplying a second liquid for forming the adhesive by contacting the first liquid on the other of the pair of inlets;
The die coater is disposed such that the pair of outlets are separated from each other and the pair of outlets are adjacent to each other in the web conveyance direction in the conveyance line, and discharges the first liquid and the second liquid from the outlet. A coating apparatus that is brought into phase contact immediately after. In the coating device according to claim 1,
The coating is characterized in that an upstream outlet in the transport direction is used for discharging the larger discharge amount of the first liquid and the second liquid, and a downstream outlet is used for discharging the smaller discharge amount. Engineering equipment. In the coating device according to claim 1,
A coating apparatus using an outlet on the upstream side in the transport direction for discharging the higher viscosity of the first liquid and the second liquid, and using a downstream outlet for discharging the lower viscosity. . In the coating device according to claim 1,
A coating apparatus, wherein an outlet on the upstream side in the transport direction is used for discharging the lower viscosity of the first liquid and the second liquid, and an outlet on the downstream side is used for discharging the higher viscosity. . In the coating apparatus as described in any one of Claims 1 thru | or 4,
A coating apparatus, wherein a vacuum chamber is disposed upstream of an outlet disposed upstream in the transport direction. In the coating apparatus as described in any one of Claims 1 thru | or 5,
Each of the die edges at the outlet for discharging the first liquid and the outlet for discharging the second liquid is formed with a radius of curvature of 100 μm or less. In the coating apparatus as described in any one of Claims 1 thru | or 6,
A coating apparatus, wherein each of the first supply means and the second supply means is provided with a temperature adjusting means for adjusting a liquid temperature. In the coating apparatus as described in any one of Claims 1 thru | or 7,
The die coater includes adjusting means for adjusting the slit length at both ends in the slit longitudinal direction at each outlet,
Each adjusting means uses a slit connected to the corresponding outlet and a liquid reservoir connected to the slit, and is slidable in the slit longitudinal direction, and includes a slit moving part that moves the slit and a part of the liquid reservoir. A slit length adjusting piece having a liquid pool moving part that moves, and a fixing piece that moves the remaining space of the liquid pool in the slit longitudinal direction and fixes the slit length adjusting piece,
The fixing piece has a tapered pressing surface that presses the liquid pool moving portion of the slit length adjusting piece against the liquid pool by being pressed inward from the outside in the slit longitudinal direction. Coating equipment. In the coating apparatus as described in any one of Claims 1 thru | or 7,
The coating apparatus characterized in that the total layer thickness of the layer made of the first liquid and the layer made of the second liquid applied to the web is 0.7 μm or more and 5 μm or less. In the coating device according to claim 1,
A backup roll made of a rubber roll is provided on the web conveyance line, and at least the tip surface portion of the die head located on the downstream side of the outlet on the downstream side in the conveyance direction among the two outlets is in contact with the peripheral surface. A coating device characterized by installation.

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