JP2008254269A - Gravure printing plate and manufacturing method of pressure-sensitive transfer adhesive tape using this plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gravure printing plate which can prevent a blade from being caught fitting into a recessed groove corresponding with a stripe and also can upgrade the adhesive power of a sizing agent layer to be formed on the surface of an adherend by a pressure-sensitive adhesive layer, when the pressure-sensitive layer is formed in a stripe-like pattern in parallel with the width direction of the pressure-sensitive transfer adhesive tape, and a manufacturing method of the pressure-sensitive transfer adhesive tape using the gravure printing plate. <P>SOLUTION: This gravure printing plate 5 has a support part 15, consisting of a plurality of projecting parts 16 and 17 whose formation positions are superposed over each other in the peripheral direction of a cylinder 2 and mutually set apart, arranged in the recessed groove 4. The manufacturing method of the pressure-sensitive transfer adhesive tape is to coat an adhesive as a creative source for the pressure-sensitive adhesive layer to one side of the strip-like base material with a width large enough to include a plurality of the pressure-sensitive transfer adhesive tapes by the gravure roll coating process using the gravure printing plate. Further, the base material is slit to the width of the pressure-sensitive transfer adhesive tape after forming the stripe-like pressure-sensitive adhesive layer. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention provides the pressure-sensitive adhesive layer of the pressure-sensitive transfer adhesive tape for transferring the pressure-sensitive adhesive layer released from the substrate to the surface of paper or the like and using it as a paste. And a manufacturing method for manufacturing the pressure-sensitive transfer adhesive tape using the gravure plate for forming a pattern on one side by a gravure roll coating method.

  A pressure-sensitive adhesive layer with a so-called pressure-sensitive adhesive property that exerts adhesive strength when pressure is applied to one side of a film-like substrate as a new glue to replace conventional stick glue or double-sided adhesive tape The pressure-sensitive transfer adhesive is laminated so as to be releasable from the substrate, and the pressure-sensitive adhesive layer is released from the substrate and transferred to a surface to be adhered such as the surface of paper to be used as a paste. Tapes are becoming popular. The pressure-sensitive transfer adhesive tape is generally supplied in a state in which a long strip is wound into a roll, and the roll is used in a state of being mounted on a transfer tool that also serves as a holder. It is.

  That is, the pressure-sensitive adhesive layer of the pressure-sensitive transfer pressure-sensitive adhesive tape is pressed from the back side of the base material by a head provided on the transfer tool and is pressed against the surface to be bonded, and the transfer tool is bonded to the pressure-sensitive adhesive layer. When moved on the surface, the pressure-sensitive transfer adhesive tape is sequentially unwound from the roll due to the adhesive force of the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is peeled off from the substrate, and the pressure-sensitive adhesive layer adheres to the adhesive. A surface of the pressure-sensitive adhesive layer is formed on the surface to be adhered.

  However, in the pressure-sensitive transfer adhesive tape, when the pressure-sensitive adhesive layer is formed in a so-called solid state so as to cover the entire surface of one side of the substrate, the transfer is completed and the head of the transfer tool is adhered. When separating from the surface, there is a sensitivity between the tail of the pressure-sensitive adhesive layer transferred to the surface to be adhered and the top of the pressure-sensitive adhesive layer of the unused pressure-sensitive transfer adhesive tape on the transfer tool side. During the separation of the pressure-sensitive adhesive layer, the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer tends to whip the yarn, and the yarn adheres to the adherend surface and stains the adherend surface, There is a problem in that it adheres to the head and prevents the subsequent pressure-sensitive adhesive layer from being smoothly transferred.

  Therefore, the pressure-sensitive adhesive layer is patterned in a substantially rectangular block shape having the width of the pressure-sensitive transfer adhesive tape or a width close thereto and the length in the length direction of the pressure-sensitive transfer adhesive tape that is substantially the same as the width. Forming a pattern (see Patent Document 1) or forming an independent dot (island) pattern (see Patent Document 2), and forming the pressure-sensitive adhesive layer independently for each block or dot. It has been proposed to transfer to the adherend surface to prevent stringing. However, in the block-shaped pattern described in Patent Document 1, the transfer is in the middle of the length direction of one block. When the pressure-sensitive adhesive layer forming the block is separated into the adherend surface side and the transfer tool side, there is a problem that stringing still tends to occur.

  Even in the case of a dot-like pattern, the same problem occurs when the area of each individual dot is large. On the other hand, if the dot area is made as small as possible in the dot-like pattern, the chance that the transfer will be completed at the middle position in the length direction of the dot can be remarkably reduced. Even so, the dot with a small area is sufficiently thick with respect to the area (the thickness depends on the method for patterning the pressure-sensitive adhesive layer, etc., and is almost the same as the solid or block pattern. Therefore, the pressure-sensitive adhesive layer for forming the dots has relatively improved film strength, and the dots are hardly separated at a position in the middle thereof.

  In other words, the dot that has been transferred at a position in the middle of the length direction is, for example, the entire dot depending on how much adhesive force has been generated on the adherend surface by pressure bonding with the head at that time, for example. However, the pressure-sensitive adhesive layer is hardly separated at a position in the middle of the dot as described above. The problem of stringing can be solved.

  However, the smaller the dot area, the smaller the proportion of the area of the adhesive layer formed on the adherend surface by the pressure-sensitive adhesive layer per unit area of the adherend surface. There was a problem that the adhesive strength of this layer was lowered. Further, the smaller the dot area, the smaller the pressure-sensitive adhesive layer forming the dots, the smaller the pressure-sensitive adhesive area to the base material, and the lower the adhesive force to the base material. In particular, when stored at a high temperature, the pressure-sensitive adhesive layer tends to stick to the back surface of the substrate, so-called blocking is likely to occur.

  When blocking occurs, the pressure-sensitive transfer adhesive tape cannot be smoothly fed out during the transfer using the transfer tool described above, so-called running failure occurs, or the feeling that the tape is adhered to the back surface of the substrate. Once the pressure-sensitive adhesive layer has been transferred to the head or the like, the pressure-sensitive adhesive layer may adhere to the adherend surface as debris and contaminate the adherend surface. In addition, even if these problems do not occur, some dots drop out, so-called dot missing defects occur, and the adhesive force of the adhesive layer formed on the adherend surface by the pressure-sensitive adhesive layer further increases. There was also the problem of a drop. The problem of missing dots is more prominent at both ends of the pressure-sensitive transfer adhesive tape.

  That is, the pressure-sensitive adhesive transfer tape is generally a gravure roll coating method in which a pressure-sensitive adhesive layer is applied to one side of a belt-like substrate having a width including a plurality of pressure-sensitive transfer adhesive tapes. After forming a pressure-sensitive adhesive layer by patterning into a dodd shape or the like, etc., the base material is manufactured by slitting into the width of a plurality of pressure-sensitive transfer adhesive tapes. Dots located in the vicinity of the interface are likely to be lost from the surface of the base material by adhering to the blade used for the slit, etc. is there.

  Therefore, the pressure-sensitive adhesive layer has the same width as that of the pressure-sensitive transfer adhesive tape and a length of about ½ or less of the width, and is parallel to the width direction of the pressure-sensitive transfer adhesive tape. It is conceivable to form a pattern in a simple stripe shape. According to the stripe pattern, since the length of each stripe in the length direction of the pressure-sensitive transfer adhesive tape is short as described above, the transfer is performed in the middle of the stripe like the block pattern. In addition to being able to reduce the opportunity to finish as much as possible, as in the case of the dot-shaped pattern described above, the smaller the length, the higher the strength of the pressure-sensitive adhesive layer, and Since separation at the midway position can be prevented, stringing can be prevented from occurring.

  When the pressure-sensitive transfer adhesive tape having the pressure-sensitive adhesive layer patterned in a stripe shape is produced by the production method described above, the pressure-sensitive adhesive layer for forming individual stripes is formed in the pattern forming step. Since the belt-like base material having a width including a plurality of pressure-sensitive transfer adhesive tapes is continuously formed over almost the entire width in the width direction, the base material is transferred to the plurality of pressure-sensitive transfer tapes. When slitting to the width of the pressure-sensitive adhesive tape, the pressure-sensitive pressure-sensitive adhesive layer can be prevented from being lost from the surface of the substrate, for example, by adhering to the blade used for the slit. Therefore, according to the stripe pattern, there is no possibility that the problem of a decrease in adhesive force due to missing dots occurs at both ends of the pressure-sensitive transfer adhesive tape as in the case of dots.

  FIG. 2 is a schematic view showing an example of the gravure roll coater 1 used for patterning the pressure-sensitive adhesive layer into the arbitrary planar shape described above by the gravure roll coating method. Referring to FIG. 2, the gravure roll coater 1 is formed in a substantially cylindrical shape, and is recessed into the outer peripheral surface 3 of the cylinder 2 from the outer peripheral surface 3 to form a planar shape of a pressure-sensitive adhesive layer to be formed. A gravure plate 5 in which a plurality of corresponding recesses 4 are formed is supported below the gravure plate 5 in a state where the gravure plate 5 is rotatably supported about the central axis 6 in the counterclockwise direction as indicated by a solid arrow in the figure. One half is immersed in a liquid pressure-sensitive adhesive 8 serving as a pressure-sensitive adhesive layer contained in a paint pan 7, and a base material 9 is sandwiched between the upper ends and the center axis 10 as a center. As shown by the solid line arrow, the backup roller 11 supported so as to be able to rotate in the clockwise direction is brought into contact.

  The gravure plate 5 is located above the liquid surface of the pressure-sensitive adhesive 8 and on the downstream side in the rotation direction of the gravure plate 5 (right side in the figure). By passing through 8, the excess pressure-sensitive adhesive 8 adhered to the surface of the gravure plate 5 is scraped off, and the pressure-sensitive adhesive 8 is selectively only in the recess 4 formed in the outer peripheral surface 3 of the gravure plate 5. The blade 12 for filling is abutted over substantially the entire width.

  In order to form a pressure-sensitive adhesive layer in a predetermined planar shape using the gravure roll coater 1, for example, a plurality of pressure-sensitive transfer adhesive tapes are provided between the gravure plate 5 and the backup roller 11. The gravure plate 5 and the backup roller 11 are rotated in the direction indicated by the solid line arrow in the drawing while sandwiching the belt-like substrate 9 having the width to include, and the substrate 9 is rotated as described above. At the same time, it is conveyed in the direction indicated by the white arrow in the figure.

  Then, the gravure plate 5 rotates and passes through the adhesive 8 accommodated in the paint pan 7, so that the adhesive 8 adheres to the surface, and then the surplus adhesive 8 that has adhered adheres to the blade 12. The base material 9 is selectively applied to the outer peripheral surface 3 on the outer peripheral surface 3 in the state where the adhesive 8 is filled only in the concave portion 4 of the outer peripheral surface 3 of the gravure plate 5. The pressure-sensitive adhesive layer 13 made of the pressure-sensitive adhesive 8 is transferred to one side of the base material 9 by being separated by the pressure-contacting force of the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer 13. A pattern is formed in a predetermined planar shape corresponding to the planar shape of the recess 4.

  Thereafter, the substrate 9 is sent to a slit process (not shown) and slit to a predetermined width, whereby a plurality of pressure-sensitive transfer adhesive tapes are produced. In order to form the pressure-sensitive adhesive layer into the stripe shape described above using the conventional gravure roll coater 1, for example, as shown in FIG. A gravure in which a plurality of groove-like recesses (hereinafter sometimes referred to as “concave grooves”) 4 corresponding to the stripe to be formed are parallel to the generatrix direction of the cylinder 2 and parallel to each other. It is conceivable to use version 5.

  However, when the gravure plate 5 is combined with the gravure roll coater 1 described above, the concave groove 4 is disposed in parallel with the blade 12, so that when the gravure plate 5 is rotated, The blade 12 fits into the groove 4 and scrapes the adhesive 8 in the groove 4. The blade 12 is formed in the plurality of grooves 4 formed on the outer peripheral surface 3 of the cylinder 2. The pressure sensitive adhesive layer cannot be patterned into a clean stripe as a result of being unable to scrape off excess adhesive adhering to the outer peripheral surface 3 of the gravure plate 5 due to vibration caused by continuous fitting. It became clear.

  Therefore, Patent Document 3 proposes a gravure plate in which concave grooves are formed in a spiral shape with respect to the outer peripheral surface of a cylinder. When the gravure plate is incorporated in a conventional gravure roll coater, the concave groove and the blade can be crossed at a predetermined angle. It is possible to prevent the fitting and the occurrence of a failure associated therewith. However, the stripe formed using the gravure plate is not parallel to the width direction of the pressure-sensitive transfer adhesive tape, but is in a state of intersecting the width direction at a predetermined angle. When the pressure-sensitive adhesive layer forming the stripe is separated into the adherend surface side and the transfer tool side, the stringing is prevented from occurring when the process ends in the middle of I couldn't.

  Patent Document 4 describes that the pressure-sensitive adhesive layer is formed in a stripe shape in a planar shape having interruption portions at a plurality of locations in the length direction. As the gravure plate 5 for forming the pressure-sensitive adhesive layer having the planar shape, for example, as shown in FIGS. 1 and 8, the adjacent concave grooves 4 and 4 corresponding to the stripes are separated. By connecting the ridges 18 on both sides of one concave groove 4 constituting the outer peripheral surface 3 of the cylinder 2 by the ridges 14 reaching the outer peripheral surface 3 in order to form the interrupting portion, each concave groove 4 may be divided into a plurality of locations in the length direction by the ridges 14.

When the gravure plate 5 is incorporated in the gravure roll coater 1 shown in FIG. 2, the ridges 14 function as support portions for supporting the blades 12, and the blades 12 are fitted into the concave grooves 4. Therefore, it is possible to prevent the occurrence of the above-described problems associated with the fitting. However, according to a study by the inventors, when the pressure-sensitive adhesive layer is patterned using the gravure plate 5, as described above, a large number of interrupted portions are formed in the pressure-sensitive adhesive layer. Therefore, the ratio of the area of the adhesive layer formed on the adherend surface by the pressure-sensitive adhesive layer per unit area of the adherend surface is reduced, and the adhesive layer It became clear that the adhesive strength decreased.
Japanese Utility Model Publication No.59-24747 JP 2001-192625 A Japanese Patent Laid-Open No. 7-34043 JP 2005-272663 A

  The object of the present invention is to form a pressure-sensitive adhesive layer in a stripe shape parallel to the width direction of the pressure-sensitive transfer adhesive tape by a gravure roll coating method in order to prevent stringing. A gravure that can prevent fitting into a groove corresponding to a stripe, and can further improve the adhesive force of the adhesive layer formed on the adherend surface by the pressure-sensitive adhesive layer. An object of the present invention is to provide a plate and a method for producing a pressure-sensitive transfer adhesive tape using the gravure plate.

  The present invention is formed in a substantially cylindrical shape used for producing a pressure-sensitive transfer adhesive tape by patterning a pressure-sensitive adhesive layer on one side of a base material in a stripe shape by a gravure roll coating method. A plurality of concave grooves filled with the pressure-sensitive adhesive layer corresponding to the stripes to be formed in the outer peripheral surface and recessed from the outer peripheral surface are parallel to the generatrix direction of the cylinder. And the gravure plates arranged in parallel to each other, and in each concave groove, the circumferential formation positions of the individual concave grooves overlap with each other over the entire circumferential length of the cylinder, and the circumferential direction A plurality of protrusions reaching the outer peripheral surface of the cylinder, the formation positions being spaced apart from each other in a direction other than a blade that is in contact with the outer peripheral surface in order to fill the concave groove with adhesive Being a support part for supporting It is an feature.

  According to the gravure plate of the present invention, the plurality of concave grooves corresponding to the striped pressure-sensitive adhesive layer does not cause stringing, so that the outer peripheral surface of the cylinder is parallel to the direction of the generatrix of the cylinder, that is, the blade In the plurality of concave grooves, the circumferential formation positions of the individual concave grooves are the same over the entire length in the circumferential direction of the cylinder. By fitting a plurality of convex portions that are formed so as to overlap and reach the outer peripheral surface of the cylinder as support portions, the blade can be prevented from being fitted into the concave grooves.

  Therefore, when the gravure plate is rotated, the blade fits into the groove and scrapes the adhesive in the groove, or the blade continues to the plurality of grooves formed on the outer peripheral surface of the cylinder. As a result, the pressure-sensitive adhesive layer cannot be patterned into clean stripes as a result of being unable to scrape off excess adhesive adhering to the outer peripheral surface of the gravure plate. Can be prevented.

Further, according to the gravure plate of the present invention, the plurality of convex portions are formed in a state of being separated from each other in a direction other than the circumferential direction of the cylinder. The pressure-sensitive adhesive layer formed on one side can have no interruption, and the adhesive force of the adhesive layer formed on the surface to be adhered by the pressure-sensitive adhesive layer is more than ever. Can be improved.
In addition, when the support portions in the groove adjacent to the circumferential direction of the cylinder are provided to be shifted from each other in the width direction of the cylinder, the portion of the blade that contacts the convex portion constituting the support portion It is possible to suppress local wear. Therefore, the adhesive is not sufficiently scraped off from the outer peripheral surface of the gravure plate corresponding to the worn portion, thereby preventing the stringing from occurring when the adjacent stripes are connected by the adhesive. be able to.

  It is represented by the ratio of the total area of the convex portions constituting the support portion in each concave groove on the outer peripheral surface of the cylinder to the total area of the total area of the convex portions and the opening area of the concave grooves. The area ratio is preferably 7 to 23%. When the area ratio exceeds the above range, the area of the glue layer formed on the adherend surface by the pressure-sensitive adhesive layer formed on one side of the substrate occupies per unit area of the adherend surface. There is a possibility that the adhesive strength of the paste layer is reduced due to a decrease in the ratio.

  In addition, if the area ratio is less than the above range, the function of the convex portion functioning as a support portion and preventing the blade from being fitted into the concave groove is lowered, and particularly when the gravure plate rotates, , By continuously fitting into a plurality of concave grooves formed on the outer peripheral surface of the cylinder, it vibrates by being able to scrape off excess adhesive adhered to the outer peripheral surface of the gravure plate, There is a risk of whispering.

  The method for producing the pressure-sensitive transfer adhesive tape of the present invention uses the gravure plate of the present invention on one side of a belt-like substrate having a width including a plurality of pressure-sensitive transfer adhesive tapes, The pressure-sensitive adhesive layer is formed by coating a base pressure-sensitive adhesive by a gravure roll coating method to form a stripe-shaped pressure-sensitive adhesive layer, and the substrate on which the pressure-sensitive adhesive layer is formed. And a step of slitting to a width of. According to the production method of the present invention, since no stringing occurs, a pressure-sensitive transfer adhesive tape having a pressure-sensitive adhesive layer patterned in a stripe shape parallel to the width direction can be efficiently produced. .

  According to the present invention, in order to prevent stringing, when the pressure-sensitive adhesive layer is patterned in a stripe shape parallel to the width direction of the pressure-sensitive transfer adhesive tape by the gravure roll coating method, A gravure that can prevent fitting into a groove corresponding to a stripe, and can further improve the adhesive force of the adhesive layer formed on the adherend surface by the pressure-sensitive adhesive layer. A plate and a method for producing a pressure-sensitive transfer adhesive tape using the gravure plate can be provided.

  FIG. 1 is a perspective view showing an example of an embodiment of a gravure plate 5 of the present invention. Referring to FIG. 1, the gravure plate 5 of the present invention is formed in a substantially cylindrical shape as in the prior art, and is formed into a stripe formed by being recessed from the outer peripheral surface 3 into the outer peripheral surface 3 of the cylinder 2. A plurality of corresponding concave grooves 4 are parallel to the generatrix direction of the cylinder 2 and arranged in parallel to each other. A difference from the prior art is that a convex portion is formed in each concave groove to serve as a support portion for supporting the blade.

  FIG. 3 is an enlarged plan view of the outer peripheral surface 3 of the gravure plate 5, showing an example of the support portion 15, and FIG. 4 is an enlarged plan view of the outer peripheral surface 3. With reference to FIGS. 1, 3, and 4, in this example, the support portion 15 is formed by a plurality of convex portions 16 and 17 that are arranged obliquely so as to intersect the concave groove 4. That is, one support portion 15 is formed in one piece with the ridges 18 on both sides of one concave groove 4 constituting the outer peripheral surface 3 of the cylinder 2 by separating the adjacent concave grooves 4 and 4 from each other. Is composed of two substantially semicircular convex parts 16 and three convex parts 17 arranged between the two convex parts 16 and having a substantially circular planar shape.

Since the convex portions 16 and 17 are arranged so that the formation positions in the circumferential direction (C direction in FIG. 4) of the cylinder 2 overlap each other, the blades arranged in parallel with the concave grooves 4 When passing through the support portion 15, it is surely supported by one of the convex portions 16, 17, and the fitting into the concave groove 4 is prevented.
Therefore, when the gravure plate 5 rotates, the blade fits into the concave groove 4 and scrapes the adhesive in the concave groove 4, or a plurality of blades formed on the outer peripheral surface 3 of the cylinder 2. The pressure sensitive adhesive layer becomes a clean stripe as a result of being unable to scrape off excess adhesive adhering to the outer peripheral surface 3 of the gravure plate 5 by vibrating by being continuously fitted in the concave groove 4. It is possible to prevent the occurrence of defects that cannot be pattern-formed.

  In addition, as shown in FIGS. 3 and 4, the protrusions 16 and 17 are formed apart from each other in the direction other than the circumferential direction. The pressure-sensitive adhesive layer formed by transferring to one side of the material can have no interruption, and the adhesive force of the glue layer formed on the adherend surface by the pressure-sensitive adhesive layer It can also be improved than before.

  In the example shown in the figure, the support portions 15 in the concave grooves 4 adjacent in the circumferential direction of the cylinder 2 are provided so as to be shifted from each other in the width direction of the cylinder (W direction in FIG. 4). It is possible to suppress local wear of the portions that contact the convex portions 16 and 17 constituting the support portion 15. Therefore, since the adhesive is not sufficiently scraped off from the outer peripheral surface 3 of the gravure plate 5 corresponding to the worn portion, the adjacent stripes are connected by the adhesive and the stringing occurs. Can be prevented.

  FIG. 5 is a plan view in which the outer peripheral surface 3 of the gravure plate 5 is enlarged, and FIG. 6 is a plan view in which the outer peripheral surface 3 is further enlarged, showing a modification of the support portion 15. With reference to FIGS. 1, 5, and 6, in this example, one support portion 15 divides the adjacent grooves 4, 4 to form the outer peripheral surface 3 of the cylinder 2. Two convex portions 19 having a substantially triangular plane shape formed integrally with the ridges 18 on both sides thereof, and a plane shape having a substantially parallelogram arrayed between the two convex portions 19 and its hypotenuse Is composed of one convex portion 20 arranged in parallel with the hypotenuse of the triangle of both convex portions 19.

Since the convex portions 19 and 20 are arranged so that the formation positions in the circumferential direction (C direction in FIG. 6) of the cylinder 2 overlap each other, the blades arranged in parallel with the concave grooves 4 When passing through the support portion 15, it is surely supported by any one of the convex portions 19 and 20, and it is possible to prevent the fitting into the concave groove 4 and the occurrence of problems associated therewith. it can.
In addition, as shown in FIGS. 5 and 6, the protrusions 19 and 20 are formed apart from each other with a gap between the hypotenuses of the triangle and the parallelogram in directions other than the circumferential direction. The pressure-sensitive adhesive layer formed by transferring the pressure-sensitive adhesive filled in the concave groove 4 to one side of the base material can have no interruption portion, and the pressure-sensitive adhesive layer can be covered by the pressure-sensitive adhesive layer. The adhesive force of the adhesive layer formed on the adhesive surface can be improved as compared with the past.

  In the example shown in the figure, the support portions 15 in the concave grooves 4 adjacent in the circumferential direction of the cylinder 2 are provided so as to be shifted from each other in the width direction of the cylinder (W direction in FIG. 6). The local wear of the portions in contact with the convex portions 19 and 20 constituting the support portion 15 can be suppressed, and the adhesive is sufficiently applied from the outer peripheral surface 3 of the gravure plate 5 corresponding to the wear portions. By not being scraped off, it is possible to prevent stringing from occurring in a state where adjacent stripes are connected by an adhesive.

  In the example of each figure, the total of the areas of the convex portions 16, 17, 19, 20 constituting the support portion 15 in the individual concave grooves 4 on the outer peripheral surface 3 of the cylinder 2 is the convex portions 16, 17. , 19 and 20 and the area ratio represented by the ratio occupied in the total area of the opening area of the groove 4 is preferably 7 to 23%, particularly preferably 10 to 20%. The reason for this is as described above. That is, when the area ratio exceeds the above range, the area of the adhesive layer formed on the adherend surface by the pressure-sensitive adhesive layer formed on one surface of the substrate, per unit area of the adherend surface There is a possibility that the adhesive force of the paste layer will be reduced.

  On the other hand, if the area ratio is less than the above range, the function of preventing the fitting of the blade into the concave groove 4 by causing the convex parts 16, 17, 19, and 20 to function as the support part 15 is reduced. When the gravure plate 5 is rotated, the blade vibrates by being continuously fitted into the plurality of concave grooves 4 formed on the outer peripheral surface 3 of the cylinder 2 and adheres to the outer peripheral surface 3 of the gravure plate 5. There is a risk that stringing may occur because the excess adhesive cannot be scraped off.

  The production method of the pressure-sensitive transfer adhesive tape of the present invention can be carried out by incorporating the gravure plate 5 of the present invention into, for example, the gravure roll coater 1 shown in FIG. At that time, the gravure plate 5 of the present invention prevents the stringing due to the effect of preventing the blade from being fitted, and the pressure-sensitive adhesive layer is formed in stripes parallel to the width direction. A pressure-sensitive transfer adhesive tape with a pattern formed can be produced efficiently.

  Referring to FIG. 2, the gravure roll coater 1 supports the gravure plate 5 of the present invention so as to be rotatable counterclockwise around the central axis 6 as indicated by a solid arrow in the figure. The lower half of the gravure plate 5 is immersed in a liquid pressure-sensitive adhesive 8 which is housed in a paint pan 7 and serves as a pressure-sensitive pressure-sensitive adhesive layer. As shown by the solid line arrow in the figure, the backup roller 11 supported so as to be able to rotate in the clockwise direction is contacted.

  The gravure plate 5 is located above the liquid surface of the pressure-sensitive adhesive 8 and on the downstream side in the rotation direction of the gravure plate 5 (right side in the figure). By passing through 8, the excess pressure-sensitive adhesive 8 attached to the surface of the gravure plate 5 is scraped off, and the pressure-sensitive adhesive is selectively used only in the groove 4 formed in the outer peripheral surface 3 of the gravure plate 5. A blade 12 for filling 8 is abutted over substantially the entire width thereof.

  In order to form a pressure-sensitive adhesive layer in a predetermined planar shape using the gravure roll coater 1, for example, a plurality of pressure-sensitive transfer adhesive tapes are provided between the gravure plate 5 and the backup roller 11. The gravure plate 5 and the backup roller 11 are rotated in the direction indicated by the solid line arrow in the drawing while sandwiching the belt-like substrate 9 having the width to include, and the substrate 9 is rotated as described above. At the same time, it is conveyed in the direction indicated by the white arrow in the figure.

  Then, the gravure plate 5 rotates and passes through the pressure-sensitive adhesive 8 accommodated in the paint pan 7, so that the pressure-sensitive adhesive 8 adheres to the surface thereof. 15 is selectively scraped off by the blade 12 that has been prevented from being fitted into the concave groove 4 by 15, so that the adhesive 8 is selectively only in the concave groove 4 of the outer peripheral surface 3 of the gravure plate 5. Is filled.

  In this state, the base material 9 is brought into pressure contact with the outer peripheral surface 3 by the pressure contact force of the backup roller 11, and then separated, the adhesive 8 in the recess 4 is transferred to one side of the base material 9, On one side, the pressure-sensitive adhesive layer 13 made of the adhesive 8 is patterned in a stripe shape corresponding to the planar shape of the concave groove 4. Thereafter, the substrate 9 is sent to a slit process (not shown) and slit to a predetermined width, whereby a plurality of pressure-sensitive transfer adhesive tapes are produced.

  In the pressure-sensitive transfer adhesive tape to be produced, the length of the strip-like pressure-sensitive adhesive layer 13 in the length direction of the tape (the width of the stripe) and the pressure-sensitive adhesive layer 13 adjacent to each other in the length direction. The interval is not particularly limited, but considering the fact that the effect of preventing stringing by forming the stripe pattern as described above is maximized, the length of the pressure-sensitive adhesive layer 13 ( The stripe width is preferably 0.5 to 2 mm, and the interval is preferably 0.1 to 0.5 mm.

  The gravure plate of the present invention and the method for producing the pressure-sensitive transfer adhesive tape are not limited to the examples of the drawings described above. For example, the convex portions that form the support portions 15 in the concave grooves 4 of the gravure plate 5 have the circumferential formation positions of the individual concave grooves 4 overlapping each other over the entire circumferential length of the cylinder. As long as the formation positions are separated from each other in a direction other than the direction, the planar shape, arrangement, and the like are not limited to the examples in the drawings, and can be any shape and arrangement. In addition, various design changes can be made without departing from the scope of the present invention.

Example 1
As the gravure plate 5, a gravure plate 5 in which convex portions 16 and 17 shown in FIGS. 3 and 4 are arranged in a concave groove 4 to form a support portion 15 was used. As shown in FIG. 3, the support portions 15 in the concave grooves 4 adjacent in the circumferential direction of the cylinder 2 are provided so as to be shifted from each other in the width direction of the cylinder. Further, the total area of the convex portions 16 and 17, the total area of the convex portions 16 and 17 constituting the support portion 15 in each concave groove 4 on the outer peripheral surface 3 of the cylinder 2, and the concave groove 4 The area ratio represented by the ratio of the opening area to the total area was 16.7%.
The gravure plate 5 is incorporated in the gravure roll coater 1 shown in FIG. 2, and an acrylic adhesive is used as an adhesive for forming a pressure-sensitive adhesive layer, and one side of a 25 μm-thick polyethylene terephthalate film as a substrate 9 Further, after forming a stripe-shaped pressure-sensitive adhesive layer 13 corresponding to the concave grooves 4, a pressure-sensitive transfer adhesive tape was manufactured by slitting to a width of 12 mm. In the pressure-sensitive transfer adhesive tape, the length of the pressure-sensitive adhesive layer 13 in the tape length direction (stripe width) is 1 mm, and the interval between the pressure-sensitive adhesive layers 13 in the length direction is 0. The thickness was 3 mm and the thickness was 25 μm.

Example 2
As in the first embodiment, the gravure plate 5 is the same as in Example 1 except that the gravure plate 5 is used in which the convex portions 19 and 20 shown in FIGS. 5 and 6 are arranged in the concave groove 4 to form the support portion 15. A transfer adhesive tape was produced. As shown in FIG. 5, the support portions 15 in the concave grooves 4 adjacent in the circumferential direction of the cylinder 2 are provided so as to be staggered in the width direction of the cylinder. The area ratio was 11.8%.

Example 3
As the gravure plate 5, the support portions 15 in the concave grooves 4 adjacent in the circumferential direction of the cylinder 2 are arranged in a row in the circumferential direction at a plurality of positions in the width direction, not in a staggered pattern as shown in FIG. A pressure-sensitive transfer adhesive tape was produced in the same manner as in Example 2 except that the provided one was used. The area ratio was 11.8%.

<< Examples 4 to 8 >>
By adjusting the area and arrangement of the convex portions 19 and 20, and the opening area of the concave groove 4, the area ratio is 25.2% (Example 4), 21.8% (Example 5), 18.5% ( A pressure-sensitive transfer adhesive tape was prepared in the same manner as in Example 2 except that the gravure plate 5 was used in Examples 6), 8.4% (Example 7), and 5.0% (Example 8). Manufactured. As shown in FIG. 5, the support portions 15 in the concave grooves 4 adjacent to each other in the circumferential direction of the cylinder 2 are provided so as to be staggered in the width direction of the cylinder.

<< Comparative Example 1 >>
A pressure-sensitive transfer pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that a gravure plate 5 was used in which the convex portion serving as the support portion was not formed in the concave groove 4.
<< Comparative Example 2 >>
As the gravure plate 5, as shown in FIG. 7, the convex portions 18 having a circular planar shape are formed in the concave groove 4, spaced apart from each other in the circumferential direction of the convex stripes 18 on both sides of the concave groove 4 and the cylinder 2. A pressure-sensitive transfer adhesive tape was produced in the same manner as in Example 1 except that 21 was used as the support 15. The area ratio was 5.1%.

<< Comparative Example 3 >>
As shown in FIG. 8, as the gravure plate 5, the gaps between adjacent ridges 4, 4 are divided to form the outer peripheral surface 3 of the cylinder 2. In order to form the embodiment, except that each groove 4 is connected by the ridges 14 reaching the outer peripheral surface 3 so that each groove 4 is divided by the ridges 14 into a plurality of locations in the length direction. In the same manner as in Example 1, a pressure-sensitive transfer adhesive tape was produced. The area ratio of the ridges 14 was 15%.

《Evaluation of stringing》
The manufacturing process of the pressure-sensitive transfer pressure-sensitive adhesive tape in each of the above Examples and Comparative Examples was carried out continuously for 10 raw films (length 5000 m) of a 25 μm-thick polyethylene terephthalate film as the substrate 9, and finally The pressure-sensitive transfer adhesive tape produced from the 10-sided original fabric was wound into a roll and mounted on a commercially available transfer tool. Then, after transferring the pressure-sensitive adhesive layer of the pressure-sensitive transfer adhesive tape to the surface of the high-quality paper as the adherend surface, when the transfer tool is pulled away from the surface, the yarns are combed. The test for confirming whether or not was repeated 10 times for each pressure-sensitive transfer adhesive tape produced in each Example and Comparative Example, and stringing was evaluated according to the following criteria.

A: No stringing occurred 10 times. Further, when the transfer tool was operated, the position where the pressure-sensitive adhesive layer was present and the position where the pressure-sensitive adhesive layer was not detected could be satisfactorily sensed as a click feeling through the transfer tool. Thus, it could be reliably pulled away from the adherend surface.
○: Slight stringing occurred 1-2 times.
Δ: Slight stringing occurred 3 times or more.
X: Large stringing occurred over the entire width of the pressure-sensitive transfer adhesive tape.

<Evaluation of adhesiveness>
Using the same transfer tool as described above, the pressure-sensitive adhesive layer of the pressure-sensitive transfer adhesive tape produced in Examples and Comparative Examples was transferred to the surface of the high-quality paper as the adherend surface, and then the same fine quality Stack two sheets of paper and move the 2kg roller back and forth twice to make the two sheets of high quality paper adhere to each other and let stand for 3 minutes. This test was repeated 10 times for each pressure-sensitive transfer adhesive tape produced in each Example and Comparative Example, and the tackiness was evaluated according to the following criteria.

A: In all 10 times, the upper quality paper was torn in the entire area of the area where the pressure-sensitive adhesive layer was transferred to the surface of the lower quality paper, and could not be peeled off.
○: Nine out of 10 times, as above, is the entire area of the area where the pressure-sensitive adhesive layer is transferred to the surface of the lower quality paper, and the upper quality paper is torn and cannot be peeled off. However, the area where the upper fine paper was torn and could not be peeled off only once was 70% or more of the area where the pressure sensitive adhesive layer was transferred to the surface of the lower fine paper and less than 100%. The upper fine paper could be peeled off slightly.
Δ: The area of the upper quality paper that was torn and could not be peeled was 70% or more and less than 100% of the area where the pressure-sensitive adhesive layer was transferred to the surface of the lower quality paper. The number of times that could be slightly peeled off was 2.
X: The area of the upper quality paper that was torn and could not be peeled off was 70% or more and less than 100% of the area where the pressure-sensitive adhesive layer was transferred to the surface of the lower quality paper, and the upper quality paper The area where the pressure sensitive adhesive layer was transferred to the surface of the lower fine paper is the area where the upper fine paper was torn and could not be peeled off, the number of times the The upper quality paper was less than 70%, and the upper quality paper could be peeled off at a relatively large area at least once.

  The results are shown in Table 1.

  From the table, in Comparative Example 1 using a gravure plate 5 that does not provide a convex portion that serves as a support in the concave groove 4 and Comparative Example 2 using a gravure plate 5 that provides a discontinuous convex portion in the circumferential direction, During rotation of the gravure plate 5, the blade 12 fits into the groove 4 and scrapes the adhesive 8 in the groove 4, or the blade 12 is formed on the outer peripheral surface 3 of the cylinder 2. As a result of vibrations caused by continuously fitting into the plurality of concave grooves 4, it becomes impossible to scrape off excess adhesive adhered to the outer peripheral surface 3 of the gravure plate 5. Since it was not possible to form a pattern in a beautiful stripe shape, stringing occurred and the amount of the adhesive was insufficient, and it was found that good adhesiveness could not be obtained.

  Further, in Comparative Example 3 using the gravure plate 5 in which the ridges 18 on both sides of one groove 4 are connected by the ridges 14, the ridges 14 form a large number of interruptions in the pressure-sensitive adhesive layer. As a result, the ratio of the area of the adhesive layer to the unit area of the surface to be adhered is reduced, and it was found that the adhesive force of the adhesive layer is reduced. On the other hand, in Examples 1 to 8 using the gravure plate 5 of the present invention, the evaluation of stringing and tackiness were both Δ to ◎, and better results than Comparative Examples 1 to 3 were obtained. It was confirmed that it was obtained.

  In addition, from the result of comparison of each example, the total of the areas of the convex portions 16, 17, 19, and 20 constituting the support portion 15 in each concave groove 4 on the outer peripheral surface 3 of the cylinder 2 is the convex portion. The area ratio expressed by the ratio of the total area of 16, 17, 19, and 20 and the opening area of the groove 4 in the total area is preferably 7 to 23%, particularly preferably 10 to 20%. It has been confirmed that the support portions 15 in the concave grooves 4 adjacent to each other in the circumferential direction of the cylinder 2 are preferably shifted from each other in the width direction of the cylinder 2.

It is a perspective view which shows an example of embodiment of the gravure of this invention. It is the schematic which shows an example of the gravure roll coater used in order to pattern-form a pressure-sensitive adhesion layer by the gravure roll coat method using the said gravure plate. It is the top view which expanded an outer peripheral surface of the said gravure plate which shows an example of the support part formed in the concave groove of a gravure plate. It is the top view which expanded the said outer peripheral surface further. It is the top view which expanded the outer peripheral surface of the said gravure plate which shows the other example of the support part formed in the concave groove of a gravure plate. It is the top view which expanded the said outer peripheral surface further. It is the top view to which the outer peripheral surface of the gravure plate used in the comparative example 2 was expanded. It is the top view which expanded the outer peripheral surface of the gravure used in Comparative Example 3.

Explanation of symbols

  1: gravure roll coater, 2: cylinder, 3: outer peripheral surface, 4: groove (recess), 5: gravure plate, 6: central axis, 7: paint pan, 8: adhesive, 9: substrate, 10: Central axis, 11: Backup roller, 12: Blade, 13: Pressure-sensitive adhesive layer, 14: Projection, 15: Support, 16: Projection, 17: Projection, 18: Projection, 19: Projection, 20 : Convex part, 21: convex part

Claims (4)

  On one side of the substrate, a pressure-sensitive adhesive layer is formed in a stripe shape by a gravure roll coating method and used to produce a pressure-sensitive transfer adhesive tape, formed in a substantially cylindrical shape, on the outer peripheral surface of the cylinder, A plurality of concave grooves filled with the pressure-sensitive adhesive layer corresponding to the stripes to be recessed from the outer peripheral surface are parallel to the cylindrical generatrix direction and are mutually connected. It is a gravure plate arranged in parallel, and in each concave groove, the circumferential formation positions of the individual concave grooves overlap with each other over the entire length in the circumferential direction of the cylinder, and in directions other than the circumferential direction. A plurality of protrusions reaching the outer peripheral surface of the cylinder, the formation positions being spaced apart from each other, and for supporting a blade that is in contact with the outer peripheral surface in order to fill the concave groove with adhesive It is characterized by being a support part of Gravure plate.   The gravure plate according to claim 1, wherein the support portions in the concave grooves adjacent in the circumferential direction of the cylinder are provided so as to be shifted from each other in the width direction of the cylinder.   On the outer peripheral surface of the cylinder, the ratio of the total area of the convex portions constituting the support portion in each concave groove to the total area of the total area of the convex portions and the opening area of the concave grooves is 7 to The gravure plate according to claim 1, which is 23%.   The pressure sensitive adhesive which becomes the origin of a pressure sensitive adhesive layer using the gravure plate in any one of Claims 1-3 on the single side | surface of the strip | belt-shaped base material which has the width | variety which includes several pressure-sensitive transfer adhesive tapes Are coated by a gravure roll coating method to form a stripe-shaped pressure-sensitive adhesive layer, and a step of slitting the substrate on which the pressure-sensitive adhesive layer is formed into the width of a plurality of pressure-sensitive transfer adhesive tapes A process for producing a pressure-sensitive transfer adhesive tape, comprising:

Images