JP2016087078A - Detachable wiping sheet and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiping sheet which improves a sense of cleaning, which can be stuck on an object to be cleaned, which makes a manufacturing process simple, and which makes a manufacturing cost low.SOLUTION: In a detachable wiping sheet, an ultrafine fiber cloth is superposed on one surface of an acrylic foam sheet with a thickness of 30-70 μm, which can be separated from/re-attached to an adherend surface.SELECTED DRAWING: Figure 1

Description

  The present invention mainly has a function of wiping off dirt or the like adhering to the surface of an object to be cleaned such as glasses, a car window, a mobile phone, a smartphone, a personal computer, or a TV, or an image display unit, and is removable from the object to be cleaned Wiping sheet.

  2. Description of the Related Art Various types of fineness are known as a nonwoven fabric sheet for cleaning. (The fineness is a unit representing the thickness of the fiber, and is expressed by the weight per 9000 m of the yarn length. For example, the fineness of the fiber having a weight of 1 g per 9000 m of the yarn length is 1 denier.) Are a fine fiber layer mainly composed of fibers having a fineness of 0.5 denier or less, a hydrophilic fiber layer mainly composed of hydrophilic fibers, and a fusion fiber layer including a heat-fusible fiber positioned between these layers, A non-woven fabric for wiping characterized by comprising at least three layers (Patent Document 1), a coarse layer mainly composed of thick fibers of 1 denier or more, and a dense layer mainly composed of ultrafine fibers of 0.8 denier or less And a wiping material (Patent Document 2) characterized in that it is made of a nonwoven fabric having an aperture, and contains 50% by weight or more of ultrafine fibers having a fineness of 0.9 denier or less on one or both sides of a mesh sheet Fiber entanglement of fiber web The formed nonwoven fiber assembly, the cleaning sheet comprising a integrated sheet entangled state with respect to net-like sheets with entanglement between its constituent fibers (Patent Document 3), and the like.

  Each wiper has the feature that fine dirt such as dust and dust can be wiped off by using extra fine fibers, and cleans a particularly smooth surface without damaging the object to be cleaned. In some cases, it is excellent in that it gives a smooth feel during use. As described above, each proposal is excellent in terms of removing dirt, but is basically a general-purpose product that does not specify the object to be cleaned and is supposed to be carried in close contact with the object to be cleaned. It wasn't. Therefore, even if the user wants to clean the object to be cleaned, there is a problem in that it cannot be cleaned immediately unless the wiper is provided nearby.

  About this point, it has an attachment member attached to a portable electronic device, and a flat belt-like string member attached to the attachment member in a ring shape, and the ultrafine fibers are arranged at a high density with the material of the string member A hand strap (Patent Document 4) having a function of removing dirt from the portable electronic device, and a cleaner for a liquid crystal screen with a design sheet sandwiched between a cleaner sheet and a transparent film ( Patent document 5) etc. are proposed. These can be used without being restricted in time and place according to the user's will by being hooked on the object to be cleaned, or connected with a string after being connected with the object to be cleaned. However, it has been difficult to apply when the object to be cleaned is not equipped with a mechanism for connecting the cleaner or the like.

  Accordingly, a sheet-like material having a wiping function is laminated on one surface of a resin film having a thickness of 20 to 100 μm, and the other surface has a pressure-sensitive adhesive layer as a detachable functional layer. A removable wiper for a display (Patent Document 6) that can be attached to the housing of the display and used to remove and wipe off the dirt of the display when necessary, and has an adhesive layer on one side of a resin film having a thickness of less than 20 μm, There has been proposed a wiping sheet (Patent Document 7) that defines the peel strength by a predetermined measurement method. Even if the object to be cleaned is not equipped with the connecting mechanism as described above, it can be attached by the adhesive layer of the wiping sheet as long as it has an appropriate smooth surface, and is carried together with the object to be cleaned. Can do. Therefore, it can be used anytime and anywhere, and after use, it can be reattached and attached to the object to be cleaned until the next use.

  According to the above technology, a wiping sheet that has a simple structure with respect to an object to be cleaned and can be attached and carried without being obstructed in structure is provided. However, since the sheet has a three-layer structure, there remains room for improvement in terms of manufacturing process and manufacturing cost. In particular, if the resin film as the intermediate layer can be eliminated, a simple structure can be obtained. However, the significance of using the resin film in the above proposal is considered to be as follows.

  Since the wiping sheet is used for cleaning, a certain degree of strength is required for the sheet during cleaning. However, since the cleaning surface is composed of ultrafine fibers, if the layer is given strength, the cleaning feel is inevitably reduced. In addition, since the surface to be cleaned should not be damaged by contact with a liquid crystal screen or a glass surface, there is a limit to imparting strength. On the other hand, since the adhesive surface is required to be flexible in order to maintain adhesion with the object to be cleaned, it is difficult to impart strength to any surface side. Therefore, the strength has been secured by using a resin film for the intermediate layer. Of course, an increase in the thickness of the adhesive layer can be expected to improve the strength, but there is a possibility that the feel of cleaning may be impaired, and it is necessary to suppress the thickness to some extent.

JP-A-5-93350 JP-A-8-275915 Japanese Patent Laid-Open No. 11-295 JP 2000-342322 A Utility Model Registration No. 3093226 International Publication WO2003 / 007777 JP 2007-151950 A

  The present invention has been made in view of the above-described problems of the prior art. By selecting a material having an appropriate strength and adhesive force for the adhesive layer while enhancing the feeling of cleaning by using ultrafine fibers, a simple 2 An object of the present invention is to provide a wiping sheet that has a layer structure and has a simple manufacturing process and reduced manufacturing costs.

  In order to solve the above-described problems, the removable wiping sheet of the present invention (hereinafter also simply referred to as “wiping sheet”) is an acrylic foam sheet having a thickness of 30 to 70 μm that can be peeled off and reattached to the adherend surface. An ultrafine fiber cloth (hereinafter also simply referred to as “fiber layer”) is laminated on one surface (hereinafter also simply referred to as “adhesion layer”).

  The said adhesion layer has moderate adhesive force with respect to the surface of a to-be-cleaned object, and has the intensity | strength which can be used for cleaning even if it is a 2 layer structure with a fiber layer.

  Moreover, the monomer component which comprises the said acrylic foam sheet | seat is characterized by including ethyl acrylate, butyl acrylate, and acrylate-2-ethylhexyl as a main component. Ethyl acrylate is a component that mainly contributes to the flexibility of the wiping sheet, and butyl acrylate and -2-ethylhexyl acrylate are components that mainly contribute to adhesion and strength.

  Furthermore, it is preferable that the ultrafine fiber cloth of the present invention is woven or knitted with a thread formed of one or more fibers. The wiping sheet of the present invention is stretched by a force applied during cleaning. This is because the fiber yarn is less likely to fray when woven and knitted as compared with the nonwoven fabric.

  As in the prior art (Patent Document 5, etc.), the wiping sheet as in the present invention is desired not only for cleaning but also to have a decorative function. Therefore, in the present invention, it is preferable that the transfer object is transferred to the surface of the ultrafine fiber cloth with a sublimation dye. It is also possible to make an original product by giving a user's favorite characters, pictures, scenery, characters, etc. to the transfer object.

  And the wiping sheet of the present invention is a step of foaming an emulsion containing an acrylic polymer and stretching it into a sheet, and superimposing the ultrafine fiber cloth on the stretched acrylic foam sheet and heating at 60 to 100 ° C. It can be produced by a manufacturing method including a step of pressurizing, and a step of laser-cutting a removable wiping sheet in which an ultrafine fiber cloth is laminated on an acrylic foam sheet after the heating / pressurizing step. It is also possible to add a transfer step using a sublimation dye before or after the laser cutting step.

  Since the wiping sheet of the present invention uses an acrylic foam sheet having an appropriate strength and excellent adhesion to an object to be cleaned, it is manufactured and used as a simple structure having a two-layer structure with an ultrafine fiber cloth. can do. Therefore, the manufacturing process is simplified, and the manufacturing cost can be further reduced.

  In addition, according to the manufacturing method of the present invention, a series of operations can be performed on the line, so that it is possible to deal with mass production. Furthermore, since each process can be operated independently, it is possible to flexibly deal with orders for a small number of lots.

FIG. 1 is a schematic view showing a wiping sheet production line of the present invention.

  The detachable wiping sheet of the present invention can be easily attached to and detached from the object to be cleaned as the name suggests, and can be carried in close contact without being bulky. Therefore, the user can peel off the wiping sheet to wipe off the surface dirt of the object to be cleaned, and then attach it again to an appropriate position on the object to be cleaned and hold and carry it integrally until the next use. ing.

  Conventionally, products that have been used in the same way as described above have been proposed, but the present invention is characterized in that it employs an extremely simple structure, and one surface of a single sheet has excellent adhesion, and deformation during use, etc. It has a two-layer structure composed of a material (acrylic foam sheet) having a strength capable of withstanding, and the other surface made of a material (extra fine fiber cloth) suitable for cleaning. Hereinafter, it demonstrates in order.

  The wiping sheet of the present invention adheres to the surface to be cleaned by the action of the adhesive layer. The “attachment surface” of the object to be cleaned is not limited to a smooth surface such as a car window, but is given a curved surface such as a textured surface and a glasses case that are used in some designs of mobile phone and smartphone housings. Also included is a surface that has irregularities formed in a lattice shape or stripe shape in order to relieve the heat generated by the electrical appliance. In short, it is not limited to a flat or smooth surface with a glass surface or mirror finish, and even if a part of the adhesive layer becomes non-contact, it is only necessary to obtain an appropriate adhesive force on the contact surface.

  The adhesion to the object to be cleaned is difficult to peel off in normal times, and it must be easy to peel off when the user uses the wiping sheet. In the present invention, a material having such contradictory functions and having high adhesiveness was selected. Although the difficulty of peeling during normal use will be described later, it is important that the whole is flexible with respect to the ease of peeling during use. Since the sheet is warped when one end of the wiping sheet is picked with a finger and pulled away from the adherend surface, the resistance to peeling is only the boundary “line” between the part that has been peeled off and the part that has been peeled off. Because. If the sheet as a whole is not flexible, the resistance to peeling will be received from the entire “surface” to which it adheres (for example, it would be like pulling off the adhering glass). it can.

  In the peeling operation, the sheet can be bent at a considerably acute angle. In the case of a resin film, a trace at the time of bending may remain depending on the type, but in the present invention, it has a simple two-layer structure of a flexible adhesive layer and a fiber layer, and this trace does not remain. One of the features. Since the trace of the bending reduces the adhesion of the wiping sheet, it must be handled with care. However, the wiping sheet of the present invention is also advantageous from that viewpoint.

  “Adhesion” described in the present specification means adhesion as defined in JISZ0237. In other words, it is “a kind of adhesion, and it is characterized by bonding without applying water, solvent, heat, etc. and applying a little pressure at room temperature for a short time”. When this adhesion (= adhesion) is taken into consideration, it is considered that there are three points. One is the “friendlyness” of the adhesive (adhesive layer) to the adherend surface (objective physical property value needs to consider the glass transition point (Tg) of the adhesive). Is the physical “suction cup effect (adsorption)” related to the uneven structure of the surface, which is thought to contribute to the adhesion force to the adherend surface, and one is the contact with the adherend surface such as hydrogen bond, hydrophobic bond, etc. “Chemical affinity”. The chemical affinity cannot be determined unconditionally because the object to be cleaned is made of various materials, but basically there are many water-repellent properties, so in the present invention acrylic that forms a hydrophobic surface is used. The polymer is used.

  First, the “suction cup effect (adsorption)” will be described. Although this effect is premised on being formed from a flexible material, the adhesive layer of the present invention is formed in a soft sheet shape, and the adherend surface is pressed against the adherend surface of the object to be cleaned. It becomes easy to bite into the fine irregularities of the. At this time, if there are fine irregularities on the surface of the adhesive layer, the air in the depressions will be expelled and an effect like a suction cup will be exhibited. However, this effect cannot be expected when there are extreme irregularities on the adhesive layer or the adherend surface, or when there are continuous linear grooves. Although the surface shape of the adherend surface (object to be cleaned) is determined by the will of the person using the wiping sheet of the present invention, it cannot be specified. In the present invention, the surface state on the adhesive layer side is set as follows. did.

  Since the pressure-sensitive adhesive layer of the present invention is a foam, fine concave portions are formed on the surface. The opening diameter of the recess is preferably in the range of 0.01 to 50 [mu] m when regarded as substantially circular. Even if it is a recessed part less than the said range, if many are formed in the surface, a suction cup effect can be expressed, but the preparation is difficult. Further, when the adherend surface is smooth, etc., the smoothness of the surface of the adhesive layer is also important for exerting the adhesive force, and therefore it is not preferable that a recess larger than the above range is formed.

  The foaming ratio of the adhesive layer is preferably in the range of 1.1 to 3.0 times. If it is less than the above, the flexibility becomes poor although it depends on the type of acrylic monomer used. That is, since it is difficult to expect flexibility due to the foaming effect, it is necessary to devise a technique for lowering the glass transition point (described below) of the material of the adhesive layer itself. On the other hand, if the expansion ratio is larger than the above, it contributes to the adhesion force to the adherend surface, but the strength of the adhesive layer tends to decrease, so the above range is desirable. The “foaming ratio” is a value obtained by dividing the density of an unfoamed acrylic polymer by the density of the foam measured with an electronic balance according to JIS K7112 Method A (submersion method in water).

  The foaming may be closed cells in which individual bubbles are dispersed, or may be open cells in which adjacent bubbles are connected. In the case of open cells having an opening on the surface, the air sucked out when the adhesive layer is pressed against the adherend surface has a relatively large amount, so that the suction cup effect tends to increase.

  Next, “ease of familiarity” will be described. For example, even if the PET film is pressed against a smooth glass surface, it does not adhere (except for electrostatic adhesion), but it can be adhered to the glass surface by wetting the PET film with water. This is because in this phenomenon, water enters between the glass surface and the PET film to bring them into close contact and expel the air layer. As described above, adhesion means that both are bonded without using water, and therefore water is not placed on the surface of the adhesive layer of the present invention. However, it is important to have surface characteristics that are easy to wet (easy to adapt) to the adherend surface. The glass transition point (Tg) was examined as a physical property value that objectively indicates this familiarity.

  The glass transition point (Tg, also referred to as glass transition temperature) may be understood as a boundary between a state where the amorphous resin is soft and rubber-elastic at a high temperature and a glassy brittle state at a low temperature. The resin (acrylic polymer) that forms the adhesive layer of the present invention has a Tg much lower than room temperature. At low temperatures below Tg, the movement of molecules is suppressed and it becomes difficult to conform to the adherend surface, and at high temperatures above Tg, thermal motion of the molecules becomes active and easy to conform to the adherend surface. It can be said that the active molecular motion is a state of high flexibility. In other words, those having a low Tg are in a rubbery state having flexibility even at room temperature, and since they are soft, they are deformed according to the shape of the adherend surface and are brought into close contact with each other, so that the adhesion effect is enhanced.

  The pressure-sensitive adhesive layer (acrylic foam sheet) of the present invention is obtained by foaming an acrylic polymer. Examples of monomer components constituting the acrylic polymer include ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, propyl acrylate, isopropyl acrylate, lauryl acrylate, ethyl methacrylate, butyl methacrylate, and isobutyl methacrylate. , Pentyl methacrylate, hexyl methacrylate, octyl methacrylate, vinyl esters such as vinyl acetate and vinyl propionate, olefins such as ethylene and propylene isobutylene, halogenated olefins, styrene monomers, diene monomers, nitrile monomers Etc., and at least one selected from the monomer group can be used.

  Among these, from the viewpoint of the Tg, methyl acrylate (Tg: 10 ° C), ethyl acrylate (Tg: -24 ° C), butyl acrylate (Tg: -54 ° C), isobutyl acrylate (Tg: -30 ° C) ), 2-ethylhexyl acrylate (Tg: -70 ° C), lauryl methacrylate (Tg: -65 ° C), and the like are preferable. A polymer obtained by copolymerizing these monomers forms an adhesive layer. It is preferable to determine each component ratio so that Tg as the adhesive layer is 10 ° C. or less, preferably 0 ° C. or less. As described above, when Tg is high, flexibility at room temperature is reduced, and the familiarity with the adherend surface is deteriorated.

  The acrylic polymer can be polymerized from a combination of the various monomers. More specifically, the molar ratio of the main component monomers is ethyl acrylate: butyl acrylate: acrylic acid-2-ethylhexyl = 2.1- It is preferable to polymerize at a ratio of 3.2: 2.6 to 3.9: 0.8 to 1.2. This is because the Tg of the adhesive layer can be 10 ° C. or less according to the ratio. Further, in the monomer, 2-ethylhexyl acrylate has a high “chemical affinity” with the plastic, and for example, the wiping sheet of the present invention can be firmly attached to a casing of a mobile phone or a television. Have

  The monomer can be polymerized by any method. For example, a water-in-oil type (W / O type) emulsion is prepared by supplying the monomer (and various solvents and surfactants if necessary) and water to an emulsifier, for example, benzoyl peroxide A polymerization initiator is added in the range of 0.1 to 5 parts by weight with respect to 100 parts by weight of all monomers, and the monomer component is polymerized by heating to obtain an emulsion containing an acrylic polymer.

  The thickness of the pressure-sensitive adhesive layer of the present invention is suitably 30 to 70 μm. If it is thinner than the above range, the strength when peeling from the adherend surface or wiping off the surface to be cleaned is lowered, so that the operability is inferior. Further, if it is thicker than the above range, the strength problem is solved, but the feeling at the time of wiping is deteriorated, and even when it is attached and carried, it can be disturbed due to its thickness.

  The ultrafine fiber cloth which is another component of the wiping sheet of the present invention will be described below. The fineness of the ultrafine fibers is preferably 0.2 to 1.0 denier, typically 0.2 to 0.5 denier. This is because, with thick fibers, dirt left behind can be entangled in the ultrafine fiber structure, and the feel and texture during wiping are good.

  As the constituent material of ultrafine fiber, polyamide fiber, polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl alcohol fiber, polyurethane fiber, aromatic polyamide fiber, acrylic fiber, polyvinyl chloride fiber, polyacrylonitrile fiber and other synthetic fibers, rayon, Regenerated fibers such as cupra and polynosic, and natural fibers such as hemp, silk, cotton, and wool can be used. These fibers can be used alone or as a mixture of two or more. Especially, a polyester fiber is preferable from the point which is excellent in intensity | strength, dimensional stability, light resistance, and dyeability.

  Depending on the purpose, the ultrafine fibers may be attached to inorganic particles such as titanium oxide particles (sterilizing effect and catalytic effect by light irradiation), pigments (designability imparted), ultraviolet absorbers (car windows, etc.) Prevention of material deterioration when holding), heat stabilizers, antibacterial agents, fragrances and the like can also be added. Each of the additives can be added to an acrylic foam sheet. However, these additives are added within a range that does not adversely affect the cleaning effect of the ultrafine fibers and the adhesion effect of the acrylic foam sheet. With these additives, the wiping sheet of the present invention is not only for cleaning, but also has decoration and fashionability, and the application range can be expanded by providing various functions.

  As the cross-sectional shape of the ultrafine fiber, various cross-sections such as a circle, an ellipse, a polygon such as a triangle or a square, a semicircle or a sector, a star or a cross can be employed. Polygons are more effective in terms of dirt retention than simple circles and ellipses, but if you think about cleaning after repeated use, circles and ellipses are more likely to release dirt held between fibers. Better. In short, the cross-sectional shape is determined in consideration of the service life of the product.

  As a method of processing the ultrafine fibers into a cloth, a known method may be adopted, and there are a method of knitting yarn to form a two-dimensional material, a method of making a cloth directly from the fibers, and the like. The former is woven and knitted with a thread formed of a single fiber or a plurality of fibers, and the latter is processed into a sheet by bonding the fibers to each other or mechanically entangled (so-called nonwoven fabric and Is called). Any method can be used for the fiber layer as the ultrafine fiber cloth of the present invention, but it is more preferable to use a woven or knitted fabric.

  Non-woven fabrics are advantageous for forming a suitable shape with a cutter, such as cutting, because fraying and fiber debris are less likely to be generated. However, in the present invention, it is necessary to consider the two-layer structure of an adhesive layer and a fiber layer. There is. In particular, in order to resist the force applied during cleaning such as pulling, it is better to be woven or knitted.

  In the prior art, a resin film is used for the intermediate layer. Since the adhesive layer has flexibility as described above, there is no problem with respect to the elongation itself. Further, since the resin film is flexible but does not stretch, the laminated nonwoven fabric was not stretched. However, if there is no resin film, when a nonwoven fabric is used for the fiber layer, there is a risk that fibers that cannot follow this elongation will tear and fray. Therefore, a woven and knitted fiber cloth is more suitable in the present invention.

  In addition, when the “resin film” used in the prior art is used for the intermediate layer, it is necessary to use an adhesive between the resin film and the ultrafine fiber cloth (the resin film and the ultrafine fiber cloth are This is because they cannot be bonded to each other simply by applying pressure.) This adhesive is very problematic during the sublimation transfer. Usually, a thermoplastic resin is often used as the above-mentioned adhesive, but such an adhesive may be melted by heating during sublimation transfer and may be sucked up by the capillary phenomenon on the surface of the ultrafine fiber cloth. . Thus, when an adhesive agent appears on the surface, there exists a possibility that a fiber may aggregate and may interfere with a softness | flexibility and a cleaning effect. In the present invention, since the intermediate layer resin film is abolished, such an adhesive is not used. Therefore, even if sublimation transfer is performed, the cleaning effect of the ultrafine fiber cloth is not lowered.

  Any conventionally known method can be used as the weaving method. As the loom, any loom of a fly shuttle type, an air jet type, a water jet type, a rapier type, or a sulzer type may be used. Moreover, the structure of the woven fabric is not limited, but various changed structures such as plain weave, twill, satin weave, double weave, and satin structure can be adopted.

  On the other hand, the nonwoven fabric manufacturing process generally consists of two processes, a fiber web forming process and an interfiber bonding process, and the fiber web forming method includes an appropriate processing method such as a card method, an air lay method, a spun bond method, a melt blown method, etc. Etc. Examples of the interfiber bonding method include a spunlace method in which fibers are entangled with a high-pressure water stream (jet water), a needle punch method in which fibers are entangled by inserting and removing a spear needle, and a thermal bond method in which fibers are thermally fused. Can do.

  By transferring the transfer object with the sublimation dye onto the surface of the ultrafine fiber cloth, the design can be changed / added according to the taste of the consumer. The wiping sheet of the present invention can perform sublimation transfer in the same manner as conventional fiber products, and it is also a feature of the present invention that the adhesive force of the adhesive layer is not reduced by heating at this time. The reason is not clear, but I think as follows.

  The polymerizability of the monomers varies considerably depending on the polymer group, and when the copolymerization is carried out in a system containing a monomer having a low polymerization reactivity, there are many polymers (polymers) having a low molecular weight. When such a polymer is heated, the molecular motion is activated. As a result, the low molecular weight polymer tends to be loosened from the molecular chain, and the physical properties of the polymer are often considerably different before and after heating. Accordingly, each molecular chain is linked and fixed using a crosslinking agent. However, when the polymer is formed into a sheet or the like as in the present invention, it is necessary to make it thermoplastic and basically a crosslinking agent or the like cannot be used.

  The acrylic polymer constituting the pressure-sensitive adhesive layer of the present invention is obtained by copolymerizing a monomer having an acrylic group or a methacrylic group as a polymerization group. These two polymer groups have high polymerization reactivity and are close to each other, so that a polymer having a relatively high molecular weight is obtained, depending on the polymerization conditions. Then, even if no crosslinking agent is used, the arrangement of molecular chains is maintained at a high temperature without much change. Therefore, it is considered that the adhesive layer of the present invention is stable to the heating of the sublimation transfer and hardly changes in physical properties.

  In addition to the thermal transfer using sublimation dyes, the method for imparting the design to the ultrafine fiber cloth may employ a known method capable of imparting characters, figures, symbols, etc. to the fiber cloth, such as silk screen printing, offset printing, and ink jet printing. . The dyeing method may be selected as appropriate, but sublimation transfer is effective for direct, easy, and short-time dyeing at the place where the product is sold according to the customer's request. For example, a customer who purchased the wiping sheet of the present invention (fiber layer is uncolored) cut to a size that can be attached to a mobile phone, etc., selects several types of prepared symbols, characters, etc. The sublimation transfer can be applied to the fiber layer by a simple thermal transfer device (for example, see Japanese Patent Application No. 2013-232573 previously filed by the present inventors).

  Next, an example of the manufacturing method of the wiping sheet of this invention is demonstrated easily based on FIG. A foaming raw material is prepared by blending a foaming aid or the like with an emulsion containing an acrylic polymer. Then, this foam raw material is supplied to the Oaks mixer 1, and at the same time, air is injected at a predetermined speed (according to the expansion ratio) to prepare a gas-liquid mixture. While rotating the stirring blade of the Oaks mixer, the gas-liquid mixture 8 is supplied and applied onto the substrate on which the reinforcing sheet 2 (PVC sheet or the like) is laminated, and the roller coater 3 (and a doctor knife if necessary). The thickness is appropriately adjusted by the coater 4). The ultrafine fiber cloth 5 was superposed on the acrylic foam sheet 9 formed in this way, heated by an oven 6 adjusted to an appropriate temperature, and dried to laminate an adhesive layer having a predetermined expansion ratio. The wiping sheet 10 is manufactured.

  A wiping sheet in which an acrylic foam sheet is laminated on a part (for example, linear, striped, spot, etc.) of an ultrafine fiber cloth by adjusting the width of the acrylic foam sheet with a doctor knife coater or the like. Can also be manufactured. Such products increase the surface area of the ultra-fine fiber cloth and relatively reduce the area of the adherend (acrylic foam sheet (adhesive layer)) to the adherend to clean the front and back surfaces of the wiping sheet. It can be used effectively. For example, when cleaning a large-area screen such as a television, the cleaning effect of the ultrafine fiber cloth is mainly required, and the entire back surface of the fiber cloth does not need to be an adhesive layer for adhesion. From the same viewpoint, after forming the ultrafine fiber cloth into a glove shape or a finger sack shape, an acrylic foam sheet may be laminated on a part thereof.

  Subsequently, the wiping sheet is laser cut into a size and shape that matches the product. It is also possible to design with a sublimation dye before or after the laser cutting step.

  The description so far has been mainly described with respect to an example in which an ultrafine fiber cloth is laminated on an acrylic foam sheet. Other possibilities include embroidery patches, gold molding patches (patterns made by winding thin metal wires in a coil shape), welder patches (high-frequency welders on materials such as metal-deposited polyurethane) instead of extra fine fiber cloth. Embossed with a pattern), hot embossed emblem (artificial leather, natural comparison with a pattern stamped on it), woven name emblem (weft yarn different from warp in a predetermined place on the fabric) Or the like, and a fluorescent tape, a stretchable fiber cloth, and the like, and an acrylic foam sheet may be laminated on the sheet.

  For example, an elastic fiber cloth laminated with an acrylic foam sheet can be applied not only to a flat surface but also to a three-dimensional shape having a somewhat smooth surface such as a helmet or a baseball bat. That is, after giving a desired design to the fiber cloth, various adhesives are applied to a part of the acrylic foam sheet, and the adhesive force of the acrylic foam sheet is used for temporary fixing to the object. The fiber cloth is used in accordance with the shape of the adherend until the adhesive is solidified. Conventionally, when a fiber cloth, emblem, or the like is adhered to an adherend having a three-dimensional shape, it is necessary to prepare a jig / mold that covers the adherend from above the fiber cloth or the like until the adhesive is solidified. However, application of the method of the present invention eliminates the need for such a mold and makes it easier to give a design to a three-dimensional shape.

  When the acrylic foam sheet cannot be directly attached, a hot melt adhesive layer (for example, melt viscosity at 125 to 165 ° C. or 150 ° C. between the emblem and the acrylic foam sheet). May be laminated with an adhesive made of a polyurethane resin having a physical property value of 8000 to 15000 Pa · s and 100% modulus of 2 to 8 MPa. The above-mentioned various patches and the like are closely bonded to the acrylic foam sheet by the hot melt adhesive, and the adherend (for example, bag, hat, shoes, etc.) by the adhesive force (including adhesion and adsorption) of the acrylic foam sheet ) On the other hand, it is possible to obtain a new decorative emblem that can be repeatedly attached and peeled off. In this case, unlike the ultrafine fiber cloth, it is desirable that the adhesive leaches into these embroidery and the like. This is because the acrylic foam sheet and the embroidery patch can be strongly bonded.

Examples relating to the wiping sheet of the present invention will be described below.
(Example)
As a monomer component, an emulsion containing an acrylic polymer prepared by polymerizing ethyl acrylate: butyl acrylate: acrylic acid-2-ethylhexyl in a molar ratio (= 3: 3: 1) was prepared, and air was blown into the figure. A wiping sheet was prepared by the manufacturing process shown in FIG. At this time, the thickness of the adhesive layer was set to 50 μm.

  The wiping sheet was cut into a predetermined shape with a laser, transferred to a fiber layer with a sublimation dye, and a wiping sheet for cleaning a mobile phone was created. This wiping sheet repeats adhesion to the mobile phone once a day and peels it off, and the adhesion does not change even if it is used for one month, and the adhesion is restored by washing the dirt on the cleaning surface with water. It was possible to use it continuously.

  As described above, the wiping sheet of the present invention has a simple two-layer structure by selecting a material having an appropriate strength and adhesive force for the adhesive layer while enhancing the feeling of cleaning using ultrafine fibers, A simple manufacturing process and a wiping sheet with reduced manufacturing costs can be provided.

  Since the wiping sheet of the present invention is stored in a state of being affixed to an object to be cleaned, it can be used at any time when necessary and can be easily attached to the position of the base after use. Since the wiping sheet can be used as a decorative item by being attached to the surface of glasses, a car window, a mobile phone, a smartphone, a personal computer, a TV, etc., it can be commercialized as a souvenir for tourists. .

DESCRIPTION OF SYMBOLS 1 Oaks mixer 2 Reinforcing sheet 3 Roller coater 4 Doctor knife coater 5 Extra fine fiber cloth 6 Oven 9 Acrylic foam sheet 10 Wiping sheet

Claims (5)

  A detachable wiping sheet in which an ultrafine fiber cloth is laminated on one surface of an acrylic foam sheet having a thickness of 30 to 70 μm that can be peeled off and reattached to the adherend surface.   The detachable wiping sheet according to claim 1, wherein a monomer component constituting the acrylic foam sheet contains ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate as main components.   The detachable wiping sheet according to claim 1 or 2, wherein the ultrafine fiber cloth is woven or knitted with a thread formed of one or a plurality of fibers.   The removable wiping sheet according to any one of claims 1 to 3, wherein a transfer object is transferred onto the surface of the ultrafine fiber cloth with a sublimation dye. Foaming an emulsion containing an acrylic polymer and stretching it into a sheet,
A step of superimposing an ultrafine fiber cloth on the stretched acrylic foam sheet and heating and pressurizing at 60 to 100 ° C .;
Laser cutting the detachable wiping sheet in which an ultrafine fiber cloth is laminated on the acrylic foam sheet after the heating / pressurizing step into a predetermined shape;
The manufacturing method of the detachable wiping sheet according to any one of claims 1 to 4, characterized by comprising:

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