JP5000280B2 - Stripe coating method, stripe coating apparatus, and stripe coating scraping blade - Google Patents

Description

  The present invention relates to a stripe coating method and a stripe coating apparatus for forming a stripe-shaped coating film, and a stripe coating scraping blade used in the method and apparatus.

  When coating liquid (eg, adhesive, paint, etc.) is continuously applied to a belt-shaped substrate such as paper, non-woven fabric, film, gauze, etc., the non-coated part and the coated part are alternately applied to the substrate in the direction of transport of the coating liquid. There are cases where so-called stripe coating is applied.

  As a method for forming a stripe-shaped coating film by applying the stripe, a scraping blade 12 having a plurality of notches 11 at the tip is conventionally used as shown in FIGS. 7 (a) and 7 (b). A method is known in which a striped coating film S is formed on the surface of the base material N by partially scraping off the coating liquid on the surface of the base material N at the tip of 12 (see, for example, Patent Document 1). In Patent Document 1, a comb blade-like doctor blade is used as a scraping blade having a plurality of notches at the tip (see the first column, right column, lines 5 to 13 of Patent Document 1).

  However, according to the conventional method for forming a striped coating film as described above, the coating liquid T1 scraped by the scraping blade 12 is accumulated on the surface side of the scraping blade 12 as shown in FIG. Since the coating liquid wraps around from the excess gap G above the cutout 11 to the back side of the scraping blade 12, the striped coating film S is formed by the wrapping coating liquid as indicated by reference numeral M in FIG. There arises a problem that both end portions of the bulge rise. When the base material N having such a bulge M is wound up as a product in a roll shape, a winding mark is attached to the base material N at the bulged portion, and the appearance is poor and the value as a product is lost.

  Moreover, in patent document 2, the method of forming a striped coating film using the coating prevention tape (22) like the FIG. 2 is disclosed, for example. However, according to the method of Patent Document 2, the thickness of the stripe-shaped coating film is determined by the thickness of the coating prevention tape (22). On the other hand, the coating blocking tape (22) is fed out with the feeding roll (17) and is wound around the winding roll (18). Therefore, when changing the thickness of the striped coating film, remove the coating prevention tape (22) from the feed roll (17) and the take-up roll (18), and newly apply a coating prevention tape of another thickness. It is necessary to carry out a large-scale operation such as attaching the feeding roll (17) to the take-up roll (18) and applying a coating prevention tape having a different thickness to the take-up roll (18). There are workability issues related to changes. Further, according to the method of Patent Document 2, the feed roll (17) for feeding the coating prevention tape (22), the winding roll (18) for winding it, and the rolls (17, 18) are driven to rotate. A drive system is required, and the entire device must be large. The reference numerals in parentheses are those used in Patent Document 2.

Japanese Patent Publication No. 7-71657

JP 2006-26558 A

  The present invention has been made to solve the above-mentioned problems, and its object is to provide a stripe coating method, a stripe coating apparatus, and a method and apparatus suitable for obtaining a striped coating film having a flat surface. Another object of the present invention is to provide a scraping blade for stripe coating used in the above.

In order to achieve the above object, a stripe coating method according to the present invention includes a scraping blade having a plurality of notches at the tip, and by scraping off a part of the coating liquid at the tip of the scraping blade, A stripe coating method for forming a stripe-shaped coating film corresponding to a notch, wherein an adjustment blade that is slidable in the height direction of the notch is provided on either one of the front and back surfaces of the scraping blade. And the height of the notch is adjusted by the slide of the adjusting blade so as to be lower than the film thickness of the coating liquid before the scraping.

The stripe coating method according to the present invention is a stripe coating method including a step of forming a striped coating film by scraping a part of the coating liquid with a scraping means and a step of transferring the coating liquid to a substrate. The scraping means includes a scraping blade having a plurality of cutouts at the tip, and a part of the coating liquid is scraped off at the tip of the scraping blade to thereby apply a striped coating corresponding to the cutout. An adjustment blade that is configured to form a film and that is slidable in the height direction of the notch is provided on one of the front and back surfaces of the scraping blade. The height of the notch is adjusted to be lower than the film thickness of the coating liquid before scraping by the slide .

The stripe coating scraping blade according to the present invention has a plurality of cutouts at the tip, and a striped coating film corresponding to the cutout is formed by partially scraping off the coating liquid at the tip. The scraping blade for scraping application is provided with an adjusting blade that can slide in the height direction of the notch on either one of the front and back surfaces of the scraping blade. The height of the notch is adjusted to be lower than the coating film thickness before the scraping by the slide of the adjusting blade .

The stripe coating apparatus according to the present invention includes a scraping blade having a plurality of cutouts at the tip, and a striped coating film corresponding to the cutout by partially scraping off the coating liquid at the tip of the scraping blade. A stripe coating apparatus for forming the adjustment blade, wherein an adjustment blade that is slidable in the height direction of the notch is provided on one of the front and back surfaces of the scraping blade. The height of the notch is adjusted by sliding so as to be lower than the film thickness of the coating liquid before the scraping.

The stripe coating apparatus according to the present invention includes a transfer unit that transfers a coating liquid onto a substrate, and a scraping unit that forms a striped coating film by partially scraping the coating liquid. Has a scraping blade having a plurality of notches at the tip, and a part of the coating liquid is scraped off at the tip of the scraping blade to form a striped coating film corresponding to the notch. In addition, an adjustment blade that is slidable in the height direction of the notch is provided on either one of the front and back surfaces of the scraping blade , and the notch of the notch is slid by sliding of the adjustment blade. The height is adjusted to be lower than the film thickness of the coating liquid before scraping.

  According to the stripe coating method, the stripe coating apparatus, and the stripe coating scraping blade according to the present invention, as the specific configuration of the scraping blade, the height of the notch is more than the film thickness of the coating liquid before scraping. Because it is configured to be lowered, when scraping the coating liquid with the scraping blade, there is no extra gap at the top of the notch, and the scraped coating liquid passes through such a gap to scrape the blade. It is possible to prevent the swell of both sides of the stripe-shaped coating film due to the wraparound of the coating liquid without wrapping around the back surface of the coating, and to obtain a strip-shaped coating film with a flat surface. A good-looking product with no trace can be provided.

  According to the stripe coating method, the stripe coating apparatus, and the stripe coating scraping blade according to the present invention configured as described above, the thickness of the stripe-shaped coating film to be formed depends on the height of the notches. Therefore, the film thickness of the stripe-shaped coating film is changed by adjusting the height of the notch. In particular, according to the configuration provided with the function of adjusting the height of the notch by sliding the adjusting blade, when changing the film thickness of the striped coating film, the height of the notch is adjusted by sliding the adjusting blade. It is possible to improve the workability of changing the film thickness of the stripe-shaped coating film. In addition, since the equipment configuration for changing the film thickness of the stripe-shaped coating film only needs to slide the adjustment blade, the effect of being able to change the film thickness of the stripe-shaped coating film with a compact equipment configuration Can also be obtained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic view of a stripe coating apparatus to which the stripe coating method of the present invention is applied.

  This stripe coating apparatus M is provided with a transfer means 1 for transferring a belt-like base material N, and the transfer means 1 winds the feed roll 2 around which the belt-like base material N is wound, and the base material N. A take-up roll 3 for taking up, and a belt-like base material N fed out from the feed-out roll 2 by a drive roll or the like (not shown) is taken up by the take-up roll 3.

  A transfer means 4 is provided in the transfer path of the substrate N. The transfer unit 4 includes a backing roll 5 and an application roll 6 that are arranged to face each other with the substrate N to be transferred interposed therebetween, and a coating liquid supply unit 7 that supplies a coating liquid to the outer peripheral surface of the application roll 6. The coating liquid supply means 7 forms a coating liquid reservoir 9 having a funnel shape in cross section between the outer peripheral surface of the application roll 6 and the outer peripheral surface of the roll knife 8 disposed adjacent thereto. The coating liquid T is supplied and applied to the outer peripheral surface of the application roll 6 rotating from 9. The supply and application of the coating liquid T here is a form in which the coating liquid is applied to the entire outer peripheral surface of the application roll 6, a so-called solid coating (entire coating) form.

  In this stripe coating apparatus M, before the coating liquid T applied to the outer peripheral surface of the application roll 6 is transferred to the surface of the substrate N, the striped coating film S is formed by scraping a part of the coating liquid T in advance. In order to form it, a scraping means 10 is provided in front of the transfer means 4.

  FIG. 2 shows the concept of the first embodiment of the scraping means 10. In this first embodiment, the scraping means 10 is composed of a single scraping blade 12 having a plurality of notches 11 at the tip, and is formed at the tip of the scraping blade 12 as shown in FIG. By changing the notch 11 having a large gap into the notch 11 having a small gap as shown in FIG. 5B, the height H2 of the notch 11 can be increased as shown in FIG. This is adjusted to be lower than the “film thickness H1 of the coating liquid before scraping” by the scraping blade 12. When the tip of the adjusted scraping blade 12 comes into contact with the outer peripheral surface 6a of the application roll 6 and the application roll 6 rotates in the direction indicated by the arrow R1 in FIG. Part of the coating liquid T is scraped off, and a striped coating film S (see FIG. 7A) having the width and height H2 of the notch 11 at the tip of the scraping blade 12 is formed.

  Here, the “notch height H2” refers to the scraping blade 12 in a state where the tip of the scraping blade 12 is in contact with the outer peripheral surface 6a of the application roll 6 as shown in FIG. It is assumed that the length H2 of the perpendicular foot that descends perpendicularly to the outer peripheral surface 6a of the application roll 6 from the bottom of the notch 11 at the tip. The “film thickness H1 of the coating liquid before scraping” is perpendicular to the outer peripheral surface of the application roll 6 from the surface of the coating liquid applied to the outer peripheral surface 6a of the application roll 6 as shown in FIG. It is assumed that the length H1 of the foot of the dropped perpendicular line.

  In FIGS. 3B and 3C, the outer peripheral surface 6a of the application roll 6 is shown as a plane for convenience of explanation, but the outer peripheral surface 6a is actually a curved surface. The same applies to FIGS. 5B and 5C and FIGS. 6B and 6C.

  Next, the operation of the stripe coating apparatus of the present embodiment configured as described above will be described with reference to FIGS.

  In the present stripe coating apparatus M, the application liquid 6 rotates in the direction indicated by the arrow R1 in FIG. 1 to supply and apply the coating liquid T in the coating liquid storage section 9 to the outer peripheral surface 6a. It is sequentially transferred in 12 directions. Then, as shown in FIG. 3 (c), a part of the coating liquid T is scraped off at the tip of the scraping blade 12, so that the width and height H2 of the notch 11 at the tip of the scraping blade 12 are striped. A coating film S (see FIG. 7A) is formed on the outer peripheral surface 6 a of the application roll 6.

  At this time, also in the present apparatus M, the coating liquid T1 scraped off as shown in FIG. 3C is accumulated on the surface side of the scraping blade 12. However, in the present apparatus M, since the height H2 of the notch 11 at the tip of the scraping blade 12 is adjusted to be lower than the film thickness H1 of the coating liquid before scraping, the notch 11 as in the prior art. An excess gap cannot be formed in the upper part, and the coating liquid T1 scraped through such an excess gap does not wrap around the back surface of the scraping blade 12. Therefore, since the wraparound of the coating liquid does not occur, both end portions of the striped coating S formed after being scraped do not rise as shown in FIG. 7C, and the striped coating S having a flat surface is formed. Is formed on the outer peripheral surface 6 a of the application roll 6.

  Then, the backing roll 5 rotates in the direction indicated by the arrow R2 in FIG. 1 corresponding to the rotation of the application roll 6, and the base material N fed out from the feeding roll 2 corresponding to the rotation of these rolls 5 and 6 is rotated. , Passing between the backing roll 5 and the application roll 6. At this time, the stripe-shaped coating film S formed on the outer peripheral surface 6a of the application roll 6 by the above-described scraping operation is transferred to the surface of the base material N, and the base material N after the transfer undergoes, for example, a drying process (not shown). Finally, it is wound on a winding roll 3.

  In FIG. 1, the rotation direction of the application roll 6 is the direction indicated by the arrow R <b> 1, but the stripe-shaped coating film S may be transferred to the substrate N by rotating in the direction opposite to the arrow R <b> 1. In that case, it is necessary to reversely install the coating liquid supply means 7 and the scraping blade 12 with respect to the application roll 6. Specifically, in FIG. 1, the coating liquid supply means 7 on the left side of the application roll 6 is arranged on the right side, and the scraping blade 12 on the right side of the application roll 6 is arranged on the left side.

  As described above, according to the stripe coating apparatus M of the present embodiment, the stripe-shaped coating film S having a flat surface is first formed on the outer peripheral surface 6a of the application roll 6, and then the stripe-shaped coating film S is formed. Since it is transferred to the surface of the substrate N, a flat striped coating film is obtained on the surface of the substrate N.

  In the case of the stripe coating apparatus M described above, the film thickness of the formed striped coating film S depends on the height H2 of the notch 11. For example, when it is desired to further reduce the thickness of the stripe-shaped coating film S shown in FIG. 3C, the gap of the notch 11 is changed to be small as shown in FIGS. Therefore, the height H2 of the notch 11 may be adjusted to be further lowered.

  Further, the height H2 of the notch 11 at the tip of the scraping blade 12 may be adjusted by changing the scraping angle θ of the scraping blade 12. For example, if the scraping angle θ of the scraping blade 12 shown in FIG. 3C is reduced, the height H2 of the notch 11 at the tip of the scraping blade 12 is decreased. Even with such a configuration, it is possible to eliminate an extra gap formed in the upper portion of the notch 11 during scraping, so that the coating liquid is prevented from wrapping through the gap and the striped coating film S having a flat surface is formed. Obtainable. The “scraping angle θ” is an angle θ formed between the outer peripheral surface 6a of the application roll 6 and the scraping blade 12, as shown in FIGS.

  FIG. 4 shows the concept of the second embodiment of the scraping means 10. In the second embodiment, the height H2 of the notch 11 at the tip of the scraping blade 12 is adjusted by overlaying the adjustment blade 13 shown in FIG. 4A on the scraping blade 12 and sliding it vertically. Configured to be possible. In this configuration, the adjustment blade 13 is disposed on the surface side of the scraping blade 12, that is, on the surface side on which the scraped coating liquid T1 is accumulated, as shown in FIG. Further, as shown in FIGS. 5A, 5B, and 5C, the presser plate 14 is disposed on the back surface side of the scraping blade 12, and the scraper blade 12 is attached to the concave portion 15 of the presser plate 14, and the presser A structure in which the scraping blade 12 is sandwiched between the plate 14 and the adjustment blade 13 and fixed with the screw 16 may be employed. In the case of this structure, the adjusting blade 13 can be slid by a predetermined amount in the direction of the height H2 of the notch 11 by loosening the screw 16, and this slide makes the “notch height H2” at the tip of the scraping blade 12 “ It can be adjusted to be lower than the film thickness H1 of the coating liquid before scraping. For example, when the adjustment blade 13 at the position shown in FIG. 5C is slid upward of the notch 11, the height H2 of the notch 11 is increased as shown in FIG. 6C. If it is desired to reduce the height H2 of the notch 11, the adjustment blade 13 may be slid on the contrary.

  In the second embodiment, the “notch height H2” described above refers to the scraping blade 12 on the outer peripheral surface 6a of the application roll 6 as shown in FIGS. 5C and 6C. It is assumed that the length H2 of the perpendicular foot descending perpendicularly to the outer peripheral surface 6a of the application roll 6 from the forefront of the adjustment blade 13 in a state where the tip of the blade is in contact. The “film thickness H1 of the coating liquid before scraping” is the same as in the first embodiment.

  Similarly to the scraping means 10 according to the first embodiment, the scraping means 10 according to the second embodiment described above also has the height H2 of the notch 11 at the tip of the scraping blade 12 before scraping. Since it is adjusted so as to be lower than the coating film thickness H1, there is no excess gap at the top of the notch 11 during scraping. Therefore, the same effect as the scraping means 10 in FIGS. That is, the stripe-shaped coating film S having a flat surface can be obtained. In particular, the adjustment blade 13 and the presser plate 14 constituting the scraping means 10 according to the second embodiment function as means for reinforcing the entire scraping blade 12 and preventing the tip of the scraping blade 12 from shaking. Therefore, there is an effect of preventing the shape deformation of the stripe coating film due to the deflection of the scraping blade 12.

  Also in the stripe coating apparatus employing the scraping means 10 according to the second embodiment, the film thickness of the formed stripe-shaped coating film S depends on the height H2 of the notch 11. For example, when the film thickness of the stripe-shaped coating film S shown in FIG. 5C is desired to be further increased, the screw 16 is loosened, and the adjusting blade 13 at the position of FIG. It is only necessary to slide upward (in a direction away from the outer peripheral surface 6a of the application roll 6) as shown in FIG.

  In the stripe coating apparatus M of FIG. 1, a method of scraping a part of the coating liquid T before being transferred to the substrate N is adopted as a method of forming the stripe-shaped coating film. A method of directly forming a striped coating film on the substrate N by directly coating the coating solution T and partially scraping the coating solution T on the substrate N with the scraping means 10 of FIGS. May be adopted.

  Moreover, in the said embodiment, in order to make the cross-sectional shape of the stripe-shaped coating film S into a rectangle, the rectangular notch 11 was employ | adopted, However, The shape of the notch 11 is not limited to it but can be changed suitably.

Schematic of the stripe coating apparatus to which the stripe coating method of the present invention is applied. The conceptual diagram of 1st Embodiment of the scraping means applied to the stripe coating apparatus of FIG. FIG. 3 is a detailed explanatory view of the first embodiment of the scraping means, in which (a) is a perspective view of the scraping means, (b) is a sectional view of the scraping means, and (c) is the same drawing. It is an enlarged view of the middle C section. The conceptual diagram of 2nd Embodiment of a scraping means. FIG. 5 is a detailed explanatory view of the second embodiment of the scraping means, in which (a) is a perspective view of the scraping means in a state in which the height of the notch is set low by sliding the adjustment blade. ) Is a sectional view of the scraping means, and (c) is an enlarged view of a portion C in FIG. FIG. 6 is a detailed explanatory view of the second embodiment of the scraping means, in which (a) is a perspective view of the scraping means in a state in which the height of the notch is set high by sliding the adjustment blade. ) Is a sectional view of the scraping means, and (c) is an enlarged view of a portion C in FIG. FIG. 7A is an explanatory diagram of a method for forming a striped coating film using a scraping blade, FIG. 7B is an explanatory diagram of a scraping operation by a conventional scraping blade, and FIG. 7C is a conventional scraping operation. It is sectional drawing of the stripe-shaped coating film formed by the scraping operation | movement with a braid | blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer means 2 Feeding roll 3 Winding roll 4 Transfer means 5 Backing roll 6 Application roll 6a Outer peripheral surface of application roll 7 Coating liquid supply means 8 Rolled knife 9 Coating liquid storage part 10 Scraping means 11 Notch 12 Scraping blade 13 Adjustment blade 14 Presser plate N Substrate T Coating liquid T1 Scraped coating liquid H1 Thickness of coating liquid before scraping H2 Thickness of coating liquid after scraping (notch height)

Claims (5)

A stripe coating method comprising a scraping blade having a plurality of notches at the tip, and forming a striped coating film corresponding to the notch by partially scraping off the coating liquid at the tip of the scraping blade. ,
An adjustment blade that is slidable in the height direction of the notch is provided on either one of the front and back surfaces of the scraping blade, and the height of the notch is reduced by sliding the adjustment blade . A stripe coating method characterized by being adjusted to be lower than the film thickness of the coating liquid before scraping. A step of forming a striped coating film by scraping a part of the coating liquid with a scraping means;
A stripe coating method comprising a step of transferring a coating liquid to a substrate,
The scraping means is
It has a scraping blade having a plurality of notches at the tip, and a part of the coating liquid is scraped off at the tip of the scraping blade to form a striped coating film corresponding to the notch, In addition, an adjustment blade that can slide in the height direction of the notch is provided on one of the front and back surfaces of the scraping blade , and the height of the notch is determined by sliding the adjustment blade. Is adjusted so as to be lower than the film thickness of the coating liquid before scraping. A scraping blade for stripe application that has a plurality of notches at the tip, and forms a striped coating film corresponding to the notches by scraping a part of the coating liquid at the tip,
The scraping blade for stripe application is provided with an adjusting blade that can slide in the height direction of the notch on either one of the front and back surfaces of the scraping blade. The scraping blade for stripe application is adjusted so that the height of the notch is adjusted to be lower than the coating film thickness before the scraping. A stripe coating apparatus comprising a scraping blade having a plurality of notches at the tip, and forming a striped coating film corresponding to the notch by partially scraping off the coating liquid at the tip of the scraping blade. ,
An adjustment blade that is slidable in the height direction of the notch is provided on either one of the front and back surfaces of the scraping blade, and the height of the notch is reduced by sliding the adjustment blade . A stripe coating apparatus characterized by being adjusted to be lower than the film thickness of the coating liquid before scraping. Transfer means for transferring the coating liquid to the substrate;
A scraping means for forming a striped coating film by partially scraping the coating liquid;
The scraping means is
It has a scraping blade having a plurality of notches at the tip, and a part of the coating liquid is scraped off at the tip of the scraping blade to form a striped coating film corresponding to the notch, In addition, an adjustment blade that can slide in the height direction of the notch is provided on one of the front and back surfaces of the scraping blade , and the height of the notch is determined by sliding the adjustment blade. Is adjusted to be lower than the film thickness of the coating liquid before scraping.

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