Pressure-sensitive transfer adhesive tape

Abstract

Provided is a pressure-sensitive transfer tape or a transfer tool that further improves the coating area ratio of the adhesive and is excellent in string breakage despite this. A pressure-sensitive transfer tape (1) is configured to have a tape base material (11) extending in a transfer direction and a plurality of adhesive blocks (122) formed by coating an adhesive on one face of the tape base material, and is configured to sequentially press each portion of the tape base material against a transfer target face using a transfer head (33) to thereby transfer the adhesive (12) to the transfer target face, the adhesive blocks have a main adhesive region (13) having no corners at the outer edge, and a minute adhesive region (14) having a smaller area than the main adhesive region and integrally protruding from a portion of the main adhesive region, and the plurality of adhesive blocks are arranged with gaps therebetween in such a manner that the minute adhesive regions of the other adhesive blocks enter the gaps formed between the main adhesive regions of the adjacent adhesive blocks.

Description

Technical Field

[0001] This invention relates to supports for bonding paper and other adhesive materials such as envelopes (Japanese: ). (This refers to the use of pressure-sensitive transfer adhesive tapes for adhesive applications.) Background Technology

[0002] The so-called "tape" (Japanese: ) Pressure-sensitive transfer adhesive tape, which has an adhesive layer on a long strip-shaped substrate, and transfer apparatus filled with such pressure-sensitive transfer adhesive tape are widely available (for example, see the prior art documents below). The transfer apparatus includes: a release spool for holding the pressure-sensitive transfer adhesive tape in a wound state, a transfer head for wrapping the tape, and a take-up spool for taking up the tape.

[0003] To apply adhesive to the transfer surface of an object to be bonded, such as the seal (fold-back flap, cap) of an envelope, the user holds the transfer tool, presses the transfer head against the transfer surface, and operates by pulling the transfer tool in a specific direction. Through this operation, the adhesive-lined tape is released from the release spool and moves towards the transfer head. The tape and the adhesive it supports are pressed onto the transfer surface via the transfer head, resulting in the adhesive being transferred from the tape to the transfer surface. After the adhesive has been transferred, the tape is wound up and retrieved by a take-up spool linked to the release spool.

[0004] In this type of product, along with adhesive strength, the "adhesive breakage" (Japanese: ) during use is also important. The excellent quality of ")". If the adhesive breakage is poor, stringing will occur on the substrate and the transfer object surface, where they compete for the adhesive (Japanese: As the adhesive stretches and tears between the two, some of the adhesive remains on the substrate.

[0005] As an effective method to improve adhesive breakage, dot pattern coating has traditionally been used, employing printing techniques such as screen printing, gravure printing, offset printing, and flexographic printing to intermittently coat a substrate with numerous small adhesive blocks. Other advantages of dot patterns include: when transferring the adhesive to the substrate, air can be expelled and released from between the dispersed adhesive blocks, effectively preventing air bubbles and wrinkles caused by trapped air between the adhesive and the substrate.

[0006] Existing technical documents

[0007] Non-patent literature

[0008] Non-Patent Document 1: "Tape <Dotliner> | Kokuyo Stationery" (Dotliner and Kokuyo are registered trademarks), [Online], Reiwa 3 (1959), Kokuyo Co., Ltd., [Searched on May 11, Reiwa 3 (1959)], Internet<URL:https: / / www.kokuyo-st.co.jp / stationery / dotliner / > (Japanese: ) Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] The adhesive layer in the prepared adhesive tape has the following structure: multiple circular dots of adhesive, separated from each other, are arranged at equal intervals and in a regular pattern. In such a dot pattern, there will inevitably be gaps of some degree where no adhesive is applied.

[0011] To reliably bond the substrates and enhance their bond strength, it is preferable to maximize the proportion of adhesive per unit area, i.e., the coating area ratio. In other words, it is preferable to minimize the gaps between adhesive blocks by increasing the density of the adhesive blocks. If the coating area ratio is low, the area without adhesive gaps on the transfer surface becomes larger when the adhesive is transferred from the adhesive tape to the transfer surface of the substrate. In short, a reduction in the amount of adhesive applied may correspondingly weaken the bond strength.

[0012] However, even if the diameter of the adhesive blocks, which are circular dots, is increased, the area of ​​the gaps between the adhesive blocks does not necessarily decrease. Conversely, there are technical limitations to reducing the diameter of the adhesive blocks.

[0013] This invention provides a pressure-sensitive transfer adhesive tape or transfer tool that further increases the coating area ratio of the adhesive, and still exhibits excellent adhesive breakage.

[0014] Technical solutions for solving the problem

[0015] To address the aforementioned issues, the present invention comprises a pressure-sensitive transfer adhesive tape having a substrate extending in the transfer direction and a plurality of adhesive blocks coated with adhesive on one side of the substrate. The pressure-sensitive transfer adhesive tape is configured such that the adhesive is transferred to the transfer target surface by sequentially pressing and attaching each portion of the substrate to the transfer target surface using a transfer head. Each adhesive block has a main adhesive region without corners at its outer edge and a small adhesive region having an area smaller than the main adhesive region and integrally protruding from a portion of the main adhesive region. The plurality of adhesive blocks are arranged with gaps between them, such that the small adhesive regions of other adhesive blocks enter the gaps formed between the main adhesive regions of adjacent adhesive blocks.

[0016] The shape of the tiny adhesive region can be tapered towards the top.

[0017] When the micro-adhesive region protrudes forward from the main adhesive region along the transfer direction, for an adhesive block, the micro-adhesive region is transferred to the transfer target surface earlier than the main adhesive region of the block.

[0018] When the micro-adhesive region protrudes rearward from the main adhesive region along the transfer direction, for an adhesive block, the micro-adhesive region is transferred to the transfer target surface later than the main adhesive region of the block.

[0019] Preferably, the outer edge of the main adhesive region and the outer edge of the adjacent micro adhesive regions are continuous via a transition point where the extension direction or curvature of their tangents changes.

[0020] In this case, the outer edge of the main adhesive region and the outer edge of the minor adhesive region are continuous in such a way that they have the same tangent at the transition point.

[0021] It can be configured such that a gap of approximately a certain width is formed between the outer edge of the main adhesive region of the adhesive block and the outer edge of the small adhesive region of the other adhesive block closest to the adhesive block.

[0022] More specifically, the following configuration may be adopted: part or all of the outer edge of the main adhesive region is formed by a convex curve, and the outer edge of the micro adhesive region is formed by a pair of concave curves that bring the apexes closer to each other, wherein the convex curve of the main adhesive region and the concave curve of the micro adhesive region are continuous at the transition point.

[0023] In particular, the main adhesive region has an arc-shaped convex curve as its outer edge, and the concave curve forming the outer edge of the micro adhesive region is a shape that can form a gap of approximately a certain width between the outer edges of the main adhesive regions of other adhesive blocks, i.e., the convex curves.

[0024] The main adhesive regions of adjacent adhesive blocks partially overlap each other.

[0025] The ratio of the area of ​​the tiny adhesive region of the adhesive block to the area of ​​the main adhesive region is approximately 0.071 or less.

[0026] Invention Effects

[0027] According to the present invention, a pressure-sensitive transfer adhesive tape or transfer tool can be realized that further increases the coating area ratio of the adhesive, and still exhibits excellent adhesive breakage. Attached Figure Description

[0028] Figure 1 This is a perspective view showing a transfer apparatus according to an embodiment of the present invention.

[0029] Figure 2 This is a side view showing the transfer tool of this embodiment broken down into a refill cartridge and a main housing.

[0030] Figure 3 This is a side view showing an enlarged view of the transfer head and pressure-sensitive transfer adhesive tape of the transfer tool according to this embodiment.

[0031] Figure 4 This is a perspective view of the pressure-sensitive transfer adhesive tape of this embodiment.

[0032] Figure 5 This is a plan view showing the structure of the adhesive layer of the pressure-sensitive transfer adhesive tape according to this embodiment.

[0033] Figure 6 This is a plan view showing the enlarged shape of the adhesive block of the adhesive layer constituting the pressure-sensitive transfer adhesive tape of this embodiment.

[0034] Figure 7 This is a plan view illustrating the structure of the adhesive layer of a pressure-sensitive transfer adhesive tape according to a reference example associated with the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] 0… envelope

[0037] 1… Pressure-sensitive transfer adhesive tape

[0038] 11…with substrate

[0039] 12...Adhesive layer

[0040] 121… Strip adhesive section

[0041] 122…adhesive block

[0042] 13…Main adhesive area

[0043] 14…micro-adhesive areas

[0044] 2… Transfer tools

[0045] 3…Replacement part 33…Transfer head

[0046] 31… Release the scroll

[0047] 32… Winding up the reel

[0048] 4…Main shell

[0049] 41…Main Wheel

[0050] 42…auxiliary wheel

[0051] 43… Gear

[0052] 5…arm

[0053] A…Crimping area

[0054] P…transition point

[0055] S… with short dimension direction

[0056] T…Transfer direction

[0057] θ… a tiny angle Detailed Implementation

[0058] An embodiment of the present invention will be described with reference to the accompanying drawings. Figures 1 to 3 The image shows a transfer tool 2 equipped with the pressure-sensitive transfer adhesive tape 1 of this embodiment. The transfer tool 2 mainly consists of a replacement part 3, a main body housing 4, and an arm 5. The replacement part 3 has an output roll 31 and a take-up roll 32 for the pressure-sensitive transfer adhesive tape 1, as well as a transfer head (roller) 33. The main body housing 4 is used to mount and hold the replacement part 3. The arm 5 is rotatably connected to the main body housing 4 via a hinge.

[0059] Figure 2 The diagram shows the state before the replacement part 3 is loaded into the main body housing 4 (or after the replacement part 3 is detached from the main body housing 4). The pressure-sensitive transfer adhesive tape 1 is pre-wound onto the release reel 31. The pressure-sensitive transfer adhesive tape 1 released from the release reel 31 is wrapped around the outer periphery of the cylindrical transfer head 33, which is supported by a shaft and is rotatable, and is then wound up by the take-up reel 32 via the transfer head 33.

[0060] The main housing 4 is equipped with a main wheel 41 that supports the release spool 31, a secondary wheel 42 that supports the take-up spool 32, and a gear 43 located between the main wheel 41 and the secondary wheel 42. The take-up spool 32 rotates in response to the rotation of the release spool 31, utilizing these main wheels 41, secondary wheels 42, and gear 43. In this transfer apparatus 2, the release spool 31, the take-up spool 32, and the main wheel 41, secondary wheel 42, and gear 43 that support the release spool 31 and the take-up spool 32 constitute a tape supply mechanism that sequentially supplies the pressure-sensitive transfer adhesive tape 1 to the transfer head 33.

[0061] The arm 5, together with the main housing 4 (and the replacement part 3 installed on the housing), serves to clamp the object to be transferred, which has the adhesive to be transferred.

[0062] like Figure 1 and Figure 3 As shown, when the main body 4 and arm 5 of the transfer tool 2 hold the cover of the object to be adhered, such as a paper envelope 0, and the transfer tool 2 slides relative to the cover of the envelope 0 in a certain direction, typically the width direction of the envelope 0, the pressure-sensitive transfer adhesive tape 1 hanging around the transfer head 33 is pressed and attached sequentially to the inward surface of the cover, which is the transfer target surface. Furthermore, the adhesive (block) coated on the substrate 11 of the pressure-sensitive transfer adhesive tape 1 is transferred to the inward surface of the cover.

[0063] At this time, the pressure-sensitive transfer adhesive tape 1 is slowly released from the release reel 31 and slowly wound up by the take-up reel 32. Specifically, the pressure-sensitive transfer adhesive tape 1, pressed against the seal of the envelope 0, is temporarily held in place by the adhesive, while the transfer head 33 presses the pressure-sensitive transfer adhesive tape 1 towards the seal of the envelope 0 and moves towards the side where the release reel 31 is located. During this process, the transfer head 33 pulls the pressure-sensitive transfer adhesive tape 1 from the release reel 31, and the release reel 31, pulled by the pressure-sensitive transfer adhesive tape 1, rotates, causing the take-up reel 32 to rotate in conjunction. The rotational speeds of the release reel 31 and the take-up reel 32 correspond to the relative movement speed of the transfer device 2 relative to the seal of the envelope 0.

[0064] If, after the adhesive is transferred to the inside of the cap, the cap is folded back to close the opening of the body (trunk) of envelope 0, and the two are pressed together by sandwiching the adhesive between the cap and the body of envelope 0, then the cap is pasted near the opening of the body, and envelope 0 is sealed.

[0065] The pressure-sensitive transfer adhesive tape of this embodiment will be described in detail below. For example... Figures 4 to 6 As shown, the pressure-sensitive transfer adhesive tape 1 of this embodiment includes: a tape substrate 11 obtained by forming a film into a long strip, and an adhesive layer 12 formed by coating an adhesive on one side of the tape substrate 11, that is, the side exposed when it is wrapped around the transfer head 33 of the transfer tool 2 (not in contact with the transfer head 33).

[0066] The film used as the raw material for the substrate 11 is, for example, a polyethylene terephthalate film, but any film capable of supporting the adhesive layer 12 in a peelable manner is acceptable, such as a plastic film made of polyethylene, polypropylene, polyvinyl chloride, cellophane, metal foil, etc. Alternatively, the substrate 11 may be used in a manner where a release layer made of silicone resin, fluororesin, etc., is provided on the outer surface of an object that does not possess the ability to peel off the adhesive layer 12, thereby imparting a peelable effect to the adhesive layer 12.

[0067] like Figures 4 to 6As shown, the adhesive layer 12 is formed by intermittently arranging multiple adhesive blocks 122 separated by fine gaps on the substrate 11. Such an adhesive layer 12 can be formed, for example, by pattern coating using printing techniques such as screen printing, gravure printing, offset printing, and flexographic printing.

[0068] The type of adhesive can be acrylic, styrene, rubber, silicone, rosin, polyurethane, etc., and is arbitrary. However, in order to accurately and efficiently coat the substrate 11 using known printing methods, it is preferable to use an acrylic adhesive having an acrylic copolymer.

[0069] Among them, adhesive compositions containing acrylic triblock copolymers are examples of adhesive compositions that possess excellent heat resistance and weather resistance, as well as excellent adhesion and cohesion, which are required during manufacturing and storage. Acrylic triblock copolymers are triblock copolymers represented by the formula ABA or the formula ABC (where A, B, and C represent different polymer blocks).

[0070] In acrylic triblock copolymers, it is more preferable that at least one of polymer blocks A, B, and C is composed of alkyl acrylate units and / or alkyl methacrylate units; more preferably, all polymer blocks A, B, and C are composed of alkyl acrylate and / or alkyl methacrylate units; particularly preferably, polymer block A is composed of alkyl methacrylate and polymer block B is composed of alkyl alkyl alkyl alkyl acrylate. The polymer block C is composed of alkyl methacrylate or alkyl acrylate.

[0071] Examples of particularly preferred acrylic triblock copolymers include triblock copolymers represented by the formula ABA or ABC, such as polymethyl methacrylate-b-butyl polyacrylate-b-polymethyl methacrylate, polymethyl methacrylate-b-ethyl polyacrylate-b-polymethyl methacrylate, polymethyl methacrylate-b-butyl polyacrylate-b-polymethyl methacrylate, polymethyl methacrylate-b-butyl polyacrylate-b-ethyl polyacrylate, and polymethyl methacrylate-b-2-ethylhexyl polyacrylate-b-polymethyl methacrylate.

[0072] Acrylic adhesives can be composed solely of the aforementioned triblock copolymers, or other components can be appropriately incorporated. From the perspective of achieving excellent compatibility with triblock copolymers and obtaining adhesives with improved uniformity, heat resistance, and weather resistance, diblock copolymers and tackifiers can be considered as components that can also be incorporated into acrylic adhesives.

[0073] Acrylic diblock copolymers are diblock copolymers represented by the general formula XY (where X represents a polymer block mainly composed of alkyl methacrylate units having 1 to 4 carbon atoms or alkyl units having a cyclic structure, and Y represents a polymer block mainly composed of alkyl acrylate units having 1 to 20 carbon atoms and / or alkyl methacrylate units having 5 to 20 carbon atoms). Preferably, polymer block X is mainly composed of alkyl methacrylate units having 1 to 4 carbon atoms, and polymer block Y is mainly composed of alkyl acrylate units having 1 to 20 carbon atoms.

[0074] In polymer block X, alkyl groups having 1 to 4 carbon atoms include, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, and tert-butyl. Additionally, alkyl groups having a cyclic structure include, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and isobornyl. These groups may also have substituents; examples of such substituents include alkoxy groups such as methoxy, ethoxy, n-propoxy, isopropoxy, and tert-butoxy; amino groups such as N,N-dimethylamino and N,N-diethylamino; and halogen atoms such as chlorine, bromine, and fluorine.

[0075] Examples of monomers constituting alkyl methacrylate units having alkyl or cyclic carbon atoms include methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, sec-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, 2-methoxyethyl methacrylate, 2-(N,N-dimethylamino)ethyl methacrylate, and trifluoromethyl methacrylate. One or more of these may be used.

[0076] The polymer block represented by X in the general formula may contain only alkyl methacrylate units, but may also contain monomer units other than alkyl methacrylate units having 1 to 4 carbon atoms or alkyl units having a cyclic structure, if the effective function is not compromised by a small proportion (usually less than 20% by mass relative to the total amount of polymer block X). Examples of such other monomer units include alkyl methacrylates having 5 or more carbon atoms, such as 2-ethylhexyl methacrylate and dodecyl methacrylate; alkyl acrylates such as methyl acrylate, n-butyl acrylate, and tert-butyl acrylate; methacrylates other than alkyl esters such as trimethylsilyl methacrylate; acrylates other than alkyl esters such as trimethylsilyl methacrylate; methacrylamide; N-methylmethacrylamide; N-ethylmethacrylamide; N-isopropylmethacrylamide; N,N-dimethylmethacrylamide; and N,N-diethylmethacrylamide. It is a constituent component of monomers such as methylacrylamide and other methacrylamides, acrylamide, N-methylacrylamide, N-ethylacrylamide, N-isopropylacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide and other acrylamides, methacrylic acid, acrylic acid, crotonic acid, maleic acid, maleic anhydride, fumaric acid and other vinyl monomers with carboxyl groups, styrene, α-methylstyrene, p-methylstyrene and other aromatic vinyl monomers, butadiene, isoprene and other conjugated diene monomers, olefins such as ethylene and propylene, and lactones such as ε-caprolactone and valerolactone.

[0077] In polymer block Y, alkyl groups having 1 to 20 carbon atoms include, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, 3-methylbutyl, n-octyl, 2-ethylhexyl, isononyl, dodecyl, tridecyl, stearyl, etc. Alkyl groups having 5 to 20 carbon atoms include, for example, n-pentyl, 2-methylbutyl, 3-methylbutyl, n-octyl, 2-ethylhexyl, dodecyl, stearyl, etc. These groups may also have substituents; examples of such substituents include alkoxy groups such as methoxy, ethoxy, n-propoxy, isopropoxy, tert-butoxy, etc.; amino groups such as N,N-dimethylamino, N,N-diethylamino, etc.; and halogen atoms such as chlorine, bromine, fluorine, etc.

[0078] Examples of monomers constituting alkyl acrylate units having alkyl groups having 1 to 20 carbon atoms include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, tert-butyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, tridecyl acrylate, stearyl acrylate, 2-methoxyethyl acrylate, 2-(N,N-dimethylamino)ethyl acrylate, trifluoromethyl acrylate, and trimethoxysilylpropyl acrylate. One or more of these may be used.

[0079] Examples of monomers constituting alkyl methacrylate units having alkyl groups having 5 to 20 carbon atoms include n-pentyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, dodecyl methacrylate, tridecyl methacrylate, stearyl methacrylate, 2-methoxypentyl methacrylate, 2-(N,N-dimethylamino)pentyl methacrylate, perfluoropentyl methacrylate, and 2-trimethoxysilylpentyl methacrylate. One or more of these may also be used.

[0080] The polymer block represented by Y in the general formula may contain only alkyl acrylates having an alkyl group having 1 to 20 carbon atoms and / or alkyl methacrylate units having an alkyl group having 5 to 20 carbon atoms. However, if it is a small proportion (less than 20% by mass relative to the total amount of polymer block Y) that does not impair the functional performance, it may also contain monomer units other than alkyl acrylates having an alkyl group having 1 to 20 carbon atoms and / or alkyl methacrylate units having an alkyl group having 5 to 20 carbon atoms. Examples of such monomer units include alkyl acrylates derived from alkyl groups having 21 or more carbon atoms, alkyl methacrylates having 1 to 4 carbon atoms, alkyl methacrylates having 21 or more carbon atoms, methacrylates other than alkyl esters such as trimethylsilyl methacrylate, acrylates other than alkyl esters such as trimethylsilyl methacrylate, methacrylamide, N-methylmethacrylamide, N-ethylmethacrylamide, N-isopropylmethacrylamide, N,N-dimethylmethacrylamide, and N,N-diethylmethacrylamide. The constituent components of monomers such as methacrylamide, acrylamide, N-methylacrylamide, N-ethylacrylamide, N-isopropylacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, methacrylic acid, acrylic acid, crotonic acid, maleic acid, maleic anhydride, fumaric acid, etc., vinyl monomers with carboxyl groups, styrene, α-methylstyrene, p-methylstyrene, etc., aromatic vinyl monomers, butadiene, isoprene, etc., conjugated diene monomers, ethylene, propylene, etc., olefins, ε-caprolactone, valerate, etc., etc.

[0081] The diblock copolymer represented by the general formula may, as needed, have functional groups such as hydroxyl, carboxyl, anhydride, amino, and trimethoxysilyl groups in the molecular side chain or at the end of the molecular main chain.

[0082] Furthermore, to facilitate the improvement and adjustment of tack, adhesion, and holding power, it is preferable to incorporate a tackifier into acrylic adhesives. Examples of suitable tackifiers include rosin esters, gum rosin, tall oil rosin, hydrogenated rosin esters, and maleic rosin. Rosin derivatives such as disproportionated rosin esters, terpene resins mainly composed of terpene phenolic resins, α-pinene, β-pinene, limonene, etc., (hydrogenated) petroleum resins, coumarone-indene resins, hydrogenated aromatic copolymers, styrene resins, phenolic resins, xylene resins, etc. One or more of these may be used.

[0083] The presence or absence of diblock copolymers, triblock copolymers, and tackifiers, as well as their proportions, can be appropriately selected based on the intended use of the adhesive product and the type of material being bonded; there are no particular restrictions.

[0084] The adhesive can be an emulsion adhesive or a hot melt adhesive.

[0085] In the pressure-sensitive transfer adhesive tape 1 of this embodiment, instead of uniformly coating the entire surface of the tape substrate 11 with adhesive (commonly known as "overall coating"), multiple adhesive blocks 122 separated by gaps are coated. Each adhesive block 122 has approximately the same shape and size. Dividing the adhesive layer 12 into multiple adhesive blocks 122 with gaps is to ensure good adhesive breakage when transferring and coating the adhesive layer 12 onto the transfer target surface of the object to be bonded, and to ensure good air expulsion when bonding the object to be bonded through the adhesive layer 12.

[0086] On the other hand, the presence of gaps also means that the amount of adhesive that can be applied to each unit area of ​​the transfer surface is reduced. When the amount of adhesive is reduced, the adhesive strength may weaken accordingly.

[0087] In order to properly and smoothly transfer the adhesive layer 12 from the substrate 11 to the transfer target surface of the object to be bonded, and to apply a sufficient amount of adhesive to the transfer target surface to firmly bond the object to be bonded, in this embodiment, as follows: Figure 5 and Figure 6As shown, instead of making each adhesive block 122 a simple circular dot as in existing conventional products, it is shaped into a shape resembling a mustache, with tiny adhesive regions 14 protruding forward and backward from the main circular adhesive region 13, a so-called "lemon" shape. This reduces the area of ​​the voids in the adhesive layer 12, increasing the coating area ratio, i.e., the ratio of the area occupied by the adhesive blocks 122 per unit area of ​​the substrate 11 (= area occupied by adhesive blocks 122 / area of ​​the substrate 11), thus increasing the actual amount of adhesive applied to the transfer target surface.

[0088] Figure 5 and Figure 6 The structure of the adhesive layer 12 of this pressure-sensitive transfer adhesive tape 1 is shown. Figure 5 and Figure 6 The diagram shows the shape of the substrate 11 of the pressure-sensitive transfer adhesive tape 1 when viewed from the inner surface side (which is in contact with the transfer head 33 but not with the transfer target surface) towards the surface side (which is in contact with the transfer target surface but not with the transfer head 33), assuming the substrate 11 is transparent. Furthermore, if the adhesive layer 12 has been transferred from the substrate 11 of the pressure-sensitive transfer adhesive tape 1 to the transfer target surface, then a layer appears on the transfer target surface. Figure 5 and Figure 6 Group 122 of adhesive blocks as shown.

[0089] As Figure 5 and Figure 6 The vertical direction T in the figure represents the long dimension direction of the substrate 11, and the horizontal direction S, which is orthogonal to this long dimension direction, represents the width direction of the substrate 11, i.e., the short dimension direction. The extension direction T is also the direction in which the adhesive blocks 122 are sequentially transferred to the transfer target surface. To use the transfer tool 2 to transfer and apply the adhesive layer 12 to the transfer target surface, the user holds the main body 4 of the transfer tool 2, presses the transfer head 33 with the pressure-sensitive transfer adhesive tape 1 wrapped around it onto the transfer target surface, and pulls the transfer tool 2 in this state to apply the adhesive to the transfer target surface. If... Figure 5 and Figure 6 Viewed as the transfer target surface, the transfer operation is performed by the user's hand. The transfer head 33 rolls and moves along the transfer direction T in the figure, that is, from top to bottom. During this process, each part of the pressure-sensitive transfer adhesive tape 1 is pressed and attached to the transfer target surface in sequence. At the same time, the adhesive block 122 located at the top in the figure is transferred from the tape substrate 11 to the transfer target surface first, and the adhesive block 122 located at the bottom in the figure is transferred from the tape substrate 11 to the transfer target surface later (in short, starting from the adhesive block 122 located at the top in the figure, the transfer is sequentially performed from the tape substrate 11 to the transfer target surface).

[0090] The adhesive layer 12 supported by the substrate 11 of the pressure-sensitive transfer adhesive tape 1 is configured such that a collection of multiple adhesive blocks 122 arranged laterally along the short dimension direction S, i.e., a strip-shaped adhesive portion 121, is arranged in multiple segments (multiple layers) along the transfer direction T. Between the multiple adhesive blocks 122 included in a strip-shaped adhesive portion 121, and between the segments of the strip-shaped adhesive portion 121, there are gaps where no adhesive is applied. That is, each adhesive block 122 is almost or completely separated from each other by these gaps and is placed on the substrate 11. Figure 5 and Figure 6 In the image, the adhesive block 122, formed by coating with adhesive, is marked with halftone dots. The areas without halftone dots represent voids where no adhesive is present.

[0091] When focusing on an adhesive block 122, the adhesive block 122 has a main adhesive region 13 and a smaller adhesive region 14 connected thereto, which is smaller in area than the main adhesive region 13. For example... Figure 6 As shown, the main adhesive region 13 is roughly circular in shape, as depicted by the dashed line in the figure. The outer edge of the main adhesive region 13, which also forms part of the outer edge of the adhesive block 122, is curved, without any defined angles.

[0092] The main adhesive regions 13 of two adjacent adhesive blocks 122 belonging to the same strip adhesive section 121 and along the short dimension direction of the strip are almost or completely cut and separated from each other through gaps during the stage on the strip substrate 11, that is, the stage before transfer to the transfer target surface. However, it is also possible to... Figure 6 As shown, in the stage before the adhesive block 122 is transferred onto the substrate 11, there is a pre-existing area C where the main adhesive region 13 of one adhesive block 122 and the main adhesive regions 13 of other adjacent adhesive blocks 122 rarely contact or overlap. Furthermore, during the transfer from the substrate 11 to the transfer target surface, the transfer head 33 is pressed and deformed between itself and the transfer target surface, resulting in the main adhesive regions 13 of the two adhesive blocks 122 potentially partially overlapping and connecting with each other.

[0093] The micro-adhesive region 14 protrudes from the main adhesive region 13 and extends along the transfer direction T on both the front side (upper part of the figure, the side of the pressure-sensitive transfer adhesive tape 1 that reaches the transfer head 33 earlier and is pressed and attached to the transfer target surface) and the rear side (lower part of the figure, the side of the pressure-sensitive transfer adhesive tape 1 that reaches the transfer head 33 later and is pressed and attached to the transfer target surface). The micro-adhesive region 14 has a shape that tapers towards the tip, decreasing in width along the short dimension direction S of the tape as it moves away from the main adhesive region 13. The outer edge of the micro-adhesive region 14 is curved except for its tip, without a defined angle.

[0094] The shape of an adhesive block 122 is supplemented such that the outer edge of the main adhesive region 13 and the outer edge of the minor adhesive region 14 are smoothly continuous at the transition point P, and there are no definite angles between them.

[0095] For the sake of simplicity, as follows: Figure 5 and Figure 6 As shown, the direction of the axis parallel to the line segment connecting the tops of the tiny adhesive regions 14 on both sides of an adhesive block 122 is defined as the Y direction, and the direction of the axis orthogonal to the Y direction is defined as the X direction. The X direction is the direction in which the line segment connecting the tops of the tiny adhesive regions 14 protruding forward of each of the plurality of adhesive blocks 122 belonging to the same strip adhesive portion 121 extends to each other, the direction in which the line segment connecting the tops of the tiny adhesive regions 14 protruding rearward of each of the plurality of adhesive blocks 122 belonging to the same strip adhesive portion 121 extends to each other, or the direction in which the line segment connecting the centers of the main adhesive regions 13 of each of the plurality of adhesive blocks 122 belonging to the same strip adhesive portion 121 extends to each other.

[0096] As will be described later, the Y direction is not necessarily completely aligned with the transfer direction T, and the X direction is not necessarily completely aligned with the short-length direction S; in this embodiment, they are both offset by a small angle θ. However, this does not preclude setting θ=0°, so that the Y direction is aligned with the transfer direction T and the X direction is aligned with the short-length direction S.

[0097] On the surface of the substrate 11 or on an imaginary XY plane equivalent to the transfer target surface, the entirety or most of the outer edge of the main adhesive region 13, except for the vicinity of the transfer point P, is, for example, a roughly circular arc, a roughly elliptical arc, a roughly hyperbola, a roughly parabola, or a "convex curve." A convex curve is a curve that divides the plane into inner and outer parts, and the line segment connecting any two points in the inner part (that is, the main adhesive region 13 coated with adhesive) must be contained within the inner part.

[0098] Conversely, the outer edge of the micro-adhesive region 14 is composed of a pair of concave curves that are approximately symmetrical with respect to the Y-axis, such as approximately circular arcs, approximately elliptical arcs, approximately hyperbolic curves, or approximately parabolic curves, and the apexes of the pair of concave curves gradually approach each other. A concave curve is a curve that does not satisfy the conditions of a convex curve, that is, when a plane is divided into inner and outer parts, the line segment connecting any two points in the inner part (that is, the micro-adhesive region 14 coated with adhesive) is not necessarily included in the inner part.

[0099] The outer edges of an adhesive block 122, namely the outer edges of the main adhesive region 13 and the outer edges of the minor adhesive regions 14, are continuous at their transition point P in such a manner that they have the same tangent. When the outer edge of an adhesive block 122 is considered as a function curve y=f(x) on the XY plane, at the transition point P[x... P y P That is, in x=x P At a certain point, f(x) can be differentiated using x.

[0100] Furthermore, at the transition point P, the direction of the tangent line tangent to the outer edge of the main adhesive region 13 and the outer edge of the minute adhesive region 14 of an adhesive block 122 changes, or the degree of curvature of the outer edge changes. When the first derivative of f(x) with respect to x is expressed as f'(x), and the second derivative of f(x) with respect to x is expressed as f''(x), at the transition point P, f''(x) P ) = 0 is true, and / or, f'(x) P f''(x) = 0 is true. P The point P where f''(x) = 0 is, in most cases, an "inflection point". An inflection point is defined as f''(x) = 0. P The point where f'(x1) = 0, and f'(x2) > 0 and f'(x2) < 0, or f'(x1) < 0 and f'(x2) > 0. Here, x1 ≈ x P ≈x2, x1 <x P x P <x2。f’(x P The point P where ) = 0 is a "stop point". Stop points are extreme values ​​(maximum or minimum) in most cases, but "stop inflection points (saddle points)" that are both stop points and inflection points are not extreme values.

[0101] Moreover, such as Figure 5 and Figure 6 As shown, the tiny adhesive regions 14 of each adhesive block 122 belonging to a certain strip adhesive portion 121 enter the gap between the main adhesive regions 13 of two adjacent adhesive blocks 122 belonging to other strip adhesive portions 121 located in front of or behind that strip adhesive portion 121. Figure 5 As depicted by a single-dotted line, a line segment extending in the X direction connects the tops of the tiny adhesive regions 14 of multiple adhesive blocks 122 belonging to the same strip adhesive section 121 to each other, passing over the main adhesive regions 13 of adhesive blocks 122 belonging to other strip adhesive sections 121.

[0102] The diameter of the main adhesive region 13, which is approximately circular in shape, in an adhesive block 122 is set, for example, in the range of approximately 0.5 mm to approximately 2 mm. Experiments have confirmed that in products where the diameter of the main adhesive region 13 exceeds 2 mm, the adhesive breakage during transfer from the substrate 11 to the transfer target surface is significantly worse. An adhesive block 122 has two small adhesive regions 14 at the front and back. When the ratio α / β of the sum of the areas α of these two small adhesive regions 14 to the area β of the main adhesive region 13 integrated with them is calculated,

[0103] With the diameter of the main adhesive region 13 being approximately 0.5 mm: approximately 0.035

[0104] With the diameter of the main adhesive region 13 being approximately 0.75 mm: approximately 0.046

[0105] With the diameter of the main adhesive region 13 being approximately 1 mm: approximately 0.054

[0106] With the diameter of the main adhesive region 13 being approximately 1.5 mm: approximately 0.065

[0107] With the diameter of the main adhesive region 13 being approximately 2 mm: approximately 0.071.

[0108] Here, as a premise, a gap of approximately 0.1 mm in width G is provided between the outer edge of the adhesive block 122 belonging to a certain strip adhesive portion 121 and the outer edge of the adhesive block 122 belonging to other strip adhesive portions 121. In order to minimize the area of ​​the gap and increase the density of the adhesive block 122, and still to achieve excellent adhesive breakage, it is preferable to set the diameter of the main adhesive region 13 to approximately 2 mm or less, and / or, set the ratio α / β of the area α of the micro adhesive region 14 to the area β of the main adhesive region 13 to approximately 0.071 or less.

[0109] Next, focusing on the multiple adhesive blocks 122 groups, in this embodiment, strictly speaking, the multiple adhesive blocks 122 belonging to the same strip adhesive portion 121 are not arranged laterally along the short dimension direction S. For example... Figure 5 and Figure 6 As shown, the X direction of the multiple adhesive blocks 122 belonging to the same strip adhesive section 121 is inclined at a small angle θ from the short dimension direction S. Furthermore, the Y direction of the multiple strip adhesive sections 121 is also inclined at a small angle θ. Since this Y direction is orthogonal to the X direction, it is not completely consistent with the transfer direction T extending from the substrate 11, i.e., the direction in which the transfer head 33 moves relative to the pressure-sensitive transfer adhesive tape 1 and the transfer target surface, but is instead inclined at a small angle θ from the transfer direction T.

[0110] As mentioned above, in Figure 5 and Figure 6 In this diagram, the surface is considered as the transfer target surface of the substrate. The transfer head 33 of the transfer tool 2 is pressed against this transfer target surface, and the transfer tool and its transfer head 33 are pulled from the top to the bottom. As a result, adhesive blocks 122 are transferred from the pressed substrate 11 to the transfer target surface. The transfer direction T is... Figure 5 and Figure 6 The vertical direction is consistent, and the Y direction drops slightly to the right shoulder on this diagram. The short-dimensional direction S is consistent with... Figure 5 and Figure 6 The left and right directions are consistent, and the X direction is slightly counterclockwise offset from the short dimension direction S of the band.

[0111] Through the above transfer operation, in Figure 5 and Figure 6 In the figure, the uppermost strip adhesive portion 121 is transferred to the transfer target surface first, and the lowermost strip adhesive portion 121 is transferred to the transfer target surface later. Regarding the plurality of adhesive blocks 122 constituting one strip adhesive portion 121, each adhesive block 122 is transferred to the transfer target surface approximately simultaneously. More precisely, the adhesive block 122 located further to the left in the figure is transferred to the transfer target surface first, and the adhesive block 122 located further to the right is transferred to the transfer target surface later. This is because the X direction of the adhesive blocks 122 arrangement descends at an angle θ to the right shoulder relative to the short dimension direction S, which is orthogonal to the transfer direction T. However, the reason for this configuration is that it is foreseeable that when the user holds the transfer tool with their right hand and performs the transfer operation, the adhesive can be transferred from the substrate 11 to the transfer target surface without leaving any residue on the substrate 11.

[0112] In the case of an adhesive block 122, of course, the small adhesive area 14 located at the top of the figure is first transferred to the transfer target surface, then the main adhesive area 13 is transferred to the transfer target surface, and finally the small adhesive area 14 located at the bottom of the figure is transferred to the transfer target surface.

[0113] During the transfer operation, the adhesive layer 12 on the substrate 11 is pressed and attached to the pressing area A of the transfer target surface by the transfer head 33, relative to the pressure-sensitive transfer adhesive tape 1 and the transfer target surface, along the T direction. Figure 5 and Figure 6 The upper part moves downwards, and the lower part moves upwards. Figure 3The transfer head 33 is cylindrical when viewed from the side, and the surface it contacts is mostly flat. Therefore, the pressure-sensitive transfer adhesive tape 1, which is wrapped around the transfer head 33, should have purely geometrical line contact with the transfer surface. However, in reality, at least one of the transfer surface, adhesive block 122, tape substrate 11, and transfer head 33 undergoes elastic deformation (and the tape substrate 11, being made of rigid resin, is difficult to elastically deform by compressing its thickness), such as... Figure 3 and Figure 5 As shown, the pressing area A expands to a certain extent along the transfer direction T.

[0114] The X direction is tilted at an angle θ relative to the short dimension direction S, but this angle θ is set such that at least half of the area of ​​a strip adhesive portion 121 can be simultaneously contained within the pressing area A. More preferably, the angle θ is set such that the entire area of ​​a strip adhesive portion 121 can be simultaneously contained within the pressing area A. The plurality of adhesive blocks 122 constituting a strip adhesive portion 121 are sometimes pressed together during the transfer operation (especially their main adhesive areas 13), or they may already be connected to each other at the time of coating onto the substrate 11 during the manufacturing process of the pressure-sensitive transfer adhesive tape 1. To ensure that such a strip adhesive portion 121 is reliably transferred to the transfer target surface without interruption, the angle θ should not be inappropriately increased.

[0115] Angle θ can be set, for example, as H ≥ h + wtanθ. Figure 5 and Figure 6 As shown, h is the maximum value of the cross-section of the adhesive block 122 obtained by cutting a strip of adhesive portion 121 along a line parallel to the transfer direction T, along the transfer direction T. And w is the width of the substrate 11 along the short dimension direction S.

[0116] When considering the design dimensions of currently widely used transfer printing equipment, assuming that θ is at its maximum,

[0117] The width of the band, w, is approximately 6mm.

[0118] The adhesive dimension h is approximately 1.5 mm.

[0119] The dimension H of the crimping area A is approximately 2.5mm.

[0120] Here, w≈6mm is the width of the narrowest adhesive tape among the representative adhesive tapes, and h≈1.5mm is the diameter of the largest circular dot pattern among the representative circular dot patterns.

[0121] H≈2.5mm is a value obtained experimentally using a typical transfer tool 2 with a transfer head 33 having an outer diameter D of approximately 4mm. Specifically, pigments such as red ink are applied to the transfer head 33 of the transfer tool 2 used as the test sample, or to a pressure-sensitive transfer adhesive tape 1 (or a substrate 11) wrapped around the transfer head 33. A certain load is applied and the tape is pressed onto a paper surface that mimics the transfer target surface. The value is determined by measuring the size of the pigment (that colors the paper) attached to the paper surface as a result, which is then used as the size of the pressing area A. In the experiment, three transfer tools 2 were used, and measurements were performed three times for each of them. The average of the maximum and the average of the minimum values ​​of the three measured sizes of the pressing area A were obtained.

[0122] Load approximately 0.3 kg: maximum value approximately 1.63 mm, minimum value approximately 0.7 mm.

[0123] Load approximately 0.5 kg: maximum value approximately 1.59 mm, minimum value approximately 0.71 mm.

[0124] Load approximately 1 kg: maximum value approximately 2.04 mm, minimum value approximately 1.01 mm

[0125] Load approximately 1.5 kg: maximum value approximately 2.40 mm, minimum value approximately 1.75 mm

[0126] Load approximately 2kg: maximum value approximately 2.66mm, minimum value approximately 2.24mm

[0127] The dimension H of the pressing area A along the transfer direction T is taken as a value between approximately 20% and approximately 62.5% of the diameter of the transfer head. Under the above conditions, tanθ≈0.167, θ≈9.55°. Therefore, it can be considered to set it as 0°<θ<approximately 10°.

[0128] In this embodiment, the spacing λ along the Y direction between the arranged strip adhesive portions 121 in the pressure-sensitive transfer adhesive tape 1 is, for example, approximately 1.415 mm when the diameter of the main adhesive region 13 of the adhesive block 122 is approximately 1.5 mm, and approximately 1.82 mm when the diameter of the main adhesive region 13 of the adhesive block 122 is approximately 2 mm. These spacings λ are smaller than the size H of the pressing region A.

[0129] In this embodiment, a pressure-sensitive transfer adhesive tape 1 is constructed as follows: the pressure-sensitive transfer adhesive tape 1 includes a tape substrate 11 extending in the transfer direction T, and an adhesive layer 12 having an adhesive coated on one side of the tape substrate 11. The pressure-sensitive transfer adhesive tape 1 is configured such that each part of the tape substrate 11 is sequentially pressed and attached to the transfer target surface by a transfer head 33 that moves relative to the tape substrate 11 in the transfer direction T, thereby sequentially transferring the adhesive layer 12 to the transfer target surface. The adhesive layer 12 is used to make the tape adhesive... The adhesive portions 121 and the unadhesive gaps are arranged alternately in the transfer direction. Each strip of adhesive portion 121 is inclined at a small angle θ relative to the short dimension direction S orthogonal to the transfer direction T. This small angle θ is set such that more than half (especially all) of the area of ​​one strip of adhesive portion 121 can be temporarily contained within the pressing area A during the process of the adhesive layer 12 on the tape substrate 11 being pressed and attached to the pressing area A of the transfer target surface by the transfer head 33. According to this embodiment, a pressure-sensitive transfer adhesive tape 1 and a transfer tool 2 that can smoothly transfer adhesive and are more convenient to use can be realized.

[0130] In particular, it is unlikely that the pressure-sensitive transfer adhesive tape 1 supported by the transfer head 33 will be in contact with the transfer target surface at the moment when only the "vacuum portion without adhesive" is opposite to the transfer target surface, or at the moment when the area of ​​adhesive in contact with the transfer target surface is extremely small. Therefore, when the user performs a transfer operation in which the transfer tool 2 moves relative to the transfer target surface along the transfer direction T, it is unlikely that the clicking vibration caused by the transfer head 33 repeatedly approaching and separating from the transfer target surface will occur, and it can be expected that the vibration will be difficult to be transmitted to the transfer tool 2 and thus to the user's fingers.

[0131] Furthermore, the adhesive can be properly transferred from the substrate 11 to the transfer target surface. That is, the possibility of adhesive failing to transfer smoothly to the transfer target surface and remaining on the substrate 11 can be further reduced, and the used portion of the substrate 11 can be wound onto the take-up reel 32 without adhesive residue. As a midway point in the transfer operation, the adhesive is pressed and transferred sequentially from one side edge (left side edge) of the substrate 11 along the short dimension direction S of the tape to the other side edge (right side edge) onto the transfer target surface. Nevertheless, since the gaps are located between each strip of adhesive portion 121, the adhesive breakage is also excellent.

[0132] Furthermore, the effective (practical) adhesive strength of the adhesive to the adhered object is further enhanced. For example, when considering the case of adhesiveting the seal of envelope 0 to the body, the user typically slides the transfer tool 2 along the width direction of envelope 0, applying adhesive to the inward surface of the seal, which is the transfer target surface. Afterward, if someone attempts to peel the seal of envelope 0 from the body of envelope 0 along the width direction (from left to right, or from right to left), the areas with strong adhesion and the areas with weak or no adhesion are clearly separated along the width direction of envelope 0, which is the transfer direction T, and are not alternately continuous. Therefore, the seal of envelope 0 is firmly adhered to the body and is difficult to peel off. Furthermore, if it is attempted to be peeled off, it is likely that the seal of envelope 0 and / or the body will be peeled off with their surface parts remaining on the other, resulting in paper tearing. In other words, it reliably leaves evidence that envelope 0 has been opened and its traces. Of course, the ability to firmly seal the envelope 0 also means that even if the envelope 0 contains a large amount of contents (such as paper sheets) and becomes thicker or larger, the envelope 0 can still be reliably sealed.

[0133] In each of the strip adhesive portions 121, a plurality of adhesive blocks 122 are arranged in a straight line. These adhesive blocks 122 may be in partial contact with each other or may be completely separated. In this embodiment, the adhesive blocks 122 are close together in the X direction and more separated in the Y direction than in the X direction. The strip adhesive portions 121 may be arranged adjacent to each other with the adhesive blocks 122 partially overlapping each other.

[0134] In the gaps formed between the strip adhesive portions 121 arranged along the transfer direction T, the adhesive extends continuously from one end edge (left end) to the other (right end) along the short dimension direction S of the substrate. This helps to further improve the adhesion of the adhesive.

[0135] Furthermore, in this embodiment, a pressure-sensitive transfer adhesive tape 1 is constructed as follows: the pressure-sensitive transfer adhesive tape 1 includes a tape substrate 11 extending in the transfer direction T, and a plurality of adhesive blocks 122 formed by coating an adhesive on one side of the tape substrate 11. The pressure-sensitive transfer adhesive tape 1 is configured such that the adhesive layer 12 is transferred to the transfer target surface by sequentially pressing and attaching each part of the tape substrate 11 to the transfer target surface using a transfer head 33. Each adhesive block 122 includes a main adhesive region 13 without corners at its outer edge, and a small adhesive region 14 having an area smaller than the main adhesive region 13 and integrally protruding from a part of the main adhesive region 13. The plurality of adhesive blocks 122 are arranged with gaps between them, such that the small adhesive regions of other adhesive blocks 122 enter the gaps formed between the main adhesive regions 13 of adjacent adhesive blocks 122. According to this embodiment, excellent adhesive breakage during the transfer operation can be ensured, and the adhesive strength of the adhesive can be sufficiently enhanced.

[0136] The tiny adhesive regions 14 in the adhesive block 122 are tapered towards the top, and conversely, the width is wider at the root where it connects to the main adhesive region 13. Therefore, when the adhesive block 122 is transferred from the substrate 11 to the target surface, the tiny adhesive regions 14 and the main adhesive region 13 are reliably transferred to the target surface without tearing, avoiding situations where a portion of the adhesive block 122 remains untransferred on the substrate 11.

[0137] The micro-adhesive region 14 extends forward from the main adhesive region 13 along the transfer direction ( Figure 5 and Figure 6 The micro adhesive region 14 is prominently positioned above the main adhesive region 13 along the transfer direction. Additionally, the micro adhesive region 14 extends rearward from the main adhesive region 13 along the transfer direction. Figure 5 and Figure 6 (The bottom part of the image is highlighted.) Therefore, it is possible to further increase the coating area ratio, increase the density of the adhesive block 122, and sufficiently increase the amount of adhesive that can be coated per unit area, thereby strengthening the adhesive strength to the adhered object.

[0138] Furthermore, the present invention is not limited to the embodiments described in detail above. Various modifications can be made to the specific configuration of each part without departing from the spirit of the invention.

[0139] Incidentally, in the pressure-sensitive transfer adhesive tape 1 of the above embodiment, a strip-shaped adhesive portion 121 is composed of multiple adhesive blocks 122 divided into sections, but alternatively, such as... Figure 7 As shown, a strip adhesive section 121 is formed by a continuous adhesive block 122.

Claims

1. A pressure-sensitive transfer adhesive tape comprising a tape substrate extending in a transfer direction and a plurality of adhesive blocks coated with an adhesive on one side of the tape substrate, wherein the pressure-sensitive transfer adhesive tape is configured to transfer the adhesive onto the transfer target surface by sequentially pressing and attaching each portion of the tape substrate to the transfer target surface using a transfer head. The adhesive block has a main adhesive region without corners at its outer edge, and a small adhesive region having an area smaller than the main adhesive region and protruding integrally from a portion of the main adhesive region. Multiple adhesive blocks are arranged with gaps between them by having tiny adhesive regions of other adhesive blocks enter the gaps formed between the main adhesive regions of adjacent adhesive blocks. The void portion extends continuously from one end edge of the substrate in the short dimension direction to the other.

2. The pressure-sensitive transfer adhesive tape according to claim 1, The tiny adhesive regions are tapered towards the top.

3. The pressure-sensitive transfer adhesive tape according to claim 1, The micro-adhesive region protrudes forward from the main adhesive region along the transfer direction.

4. The pressure-sensitive transfer adhesive tape according to claim 3, The tiny adhesive region also protrudes rearward from the main adhesive region along the transfer direction.

5. The pressure-sensitive transfer adhesive tape according to claim 1, The outer edge of the main adhesive region and the outer edge of the adjacent micro adhesive regions are continuous at transition points where the direction of extension or curvature of their tangents changes.

6. The pressure-sensitive transfer adhesive tape according to claim 5, The outer edge of the main adhesive region and the outer edge of the minor adhesive region are continuous at the transition point with the same tangent.

7. The pressure-sensitive transfer adhesive tape according to claim 5, The pressure-sensitive transfer adhesive tape is configured such that a gap of a certain width is formed between the outer edge of the main adhesive area of ​​the adhesive block and the outer edge of the small adhesive areas of other adhesive blocks closest to the adhesive block.

8. The pressure-sensitive transfer adhesive tape according to claim 5, The outer edge of the main adhesive region is partially or entirely formed by a convex curve. The outer edge of the tiny adhesive region is formed by a pair of concave curves that bring the tips gradually closer together. The convex curve of the main adhesive region and the concave curve of the minor adhesive region are continuous at the transition point.

9. The pressure-sensitive transfer adhesive tape according to claim 8, The main adhesive region has an arc-shaped convex curve as its outer edge. The concave curve forming the outer edge of the micro adhesive region is a shape that can form a gap of a certain width between the outer edges of the main adhesive regions of other adhesive blocks, i.e., the convex curves.

10. The pressure-sensitive transfer adhesive tape according to claim 1, The main adhesive regions of adjacent adhesive blocks partially overlap each other.

11. The pressure-sensitive transfer adhesive tape according to claim 1, The ratio of the area of ​​the tiny adhesive region of the adhesive block to the area of ​​the main adhesive region is less than 0.071.

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