JP7701238B2 - Adhesive Film Storage Box - Google Patents

Description

This application relates to an adhesive film storage box that stores a roll formed by rolling up a highly adhesive adhesive film such as an infection prevention film, and an adhesive film storage device in which a roll is stored in the adhesive film storage box.

For example, in the medical field, a doctor may enter a patient's information into a computer to create a medical record while examining and treating the patient. When doing so, there is a possibility that the doctor may touch the computer keyboard with the same hands that touched the patient. If the patient's bodily fluids were to come into contact with the keyboard, this is undesirable as it could lead to infection between medical staff such as doctors and nurses.

As a result, it has been suggested that, for example, a highly adhesive infection prevention film could be attached to the surface of a computer keyboard, which could then be peeled off and discarded after use.

To allow medical staff to easily use adhesive films such as the above-mentioned infection prevention film, a storage box for adhesive films has been developed that can store the adhesive film and allow the adhesive film to be pulled out and cut to the desired length when in use (see Patent Document 1).

JP 2019-51973 A

However, when the lid is opened after the film has been cut, a very large force is required to pick up the adhesive film that has been sandwiched between the cover piece and the front panel and is stuck to the front panel of the storage box. This can result in problems with picking up the adhesive film, such as not being able to pick it up properly.

In addition, if the adhesive film adheres to the box when it is pulled out of the box, it is possible that a user may use a sharp blade or similar object to pull off the edge of the film when picking up the adhesive film. However, doing so could cause the adhesive film to tear unintentionally.

This application was made in consideration of these points, and its purpose is to provide an adhesive film storage box and an adhesive film storage device that allow the user to properly pick up the adhesive film when in use.

After extensive research, the inventors discovered that the above problem can be solved by satisfying (loop stiffness L of adhesive film) > (tack force between the adhesive film and the part of the front panel that comes into contact with the adhesive film when pulled out x 6), and thus completed the present invention. In other words, the aspects of the present invention include the following.

(1) An adhesive film storage box for storing a roll of an adhesive adhesive film, the adhesive film storage box having at least a front panel, a bottom panel, a rear panel and side panels, a main body portion having an open top surface, and a lid portion capable of opening and closing the opening on the top surface of the main body portion, the front panel having a tack force adjustment portion configured to satisfy L > T x 6, where L (mN/25 mm) is the loop stiffness of the adhesive film and T (N/300 ^mm2 ) is the tack force between the adhesive film and the portion of the front panel that comes into contact with the adhesive film being pulled out.
(2) The adhesive film storage box according to (1), wherein the tack force adjustment portion is configured to satisfy L>T×12.
(3) An adhesive film storage box as described in (1) or (2), in which the tack force adjustment portion is provided on a part or the entire front surface of the front panel.
(4) An adhesive film storage box according to any one of (1) to (3), wherein the adhesive film has an adhesiveness of 0.01 N/25 mm or more.
(5) An adhesive film storage device including the adhesive film storage box according to any one of (1) to (4) and a roll of the adhesive film stored in the adhesive film storage box.
(6) The adhesive film storage device according to (5), wherein the adhesive film to be pulled out is curled convexly toward the front plate side or convexly toward the opposite side to the front plate.

The present invention provides an adhesive film storage box and an adhesive film storage device that allow the user to properly pick up the adhesive film when in use.

FIG. 2 is a perspective view showing an example of the appearance of the adhesive film storage device. 4 is a perspective view showing the adhesive film storage device when the cover is open. FIG. FIG. 2 is a perspective view showing the configuration of a roll and an adhesive film storage box. FIG. 2 is a development view of the front side of the adhesive film storage box. 4 is an explanatory diagram showing the configuration of a side portion of the adhesive film storage box. FIG. FIG. 2 is a cross-sectional view of the adhesive film storage device. FIG. 2 is an explanatory diagram of a vertical cross section of an adhesive film storage box. 1 is a perspective view of the adhesive film storage box when the opening piece is being cut off. FIG. 1 is an explanatory diagram of a vertical cross section of an adhesive film storage box, showing a state in which the adhesive film is adhered to a front panel. 10 is an explanatory diagram of a vertical cross section of the adhesive film storage box, showing the adhesive film separated from the front panel. FIG. FIG. 11 is a perspective view showing a configuration of an adhesive film storage box having a front panel of another embodiment. FIG. 12 is a development view of the front side of the adhesive film storage box of FIG. 11 . FIG. 11 is a perspective view showing a configuration of an adhesive film storage box having a front panel of another embodiment. FIG. 14 is a development view of the front side of the adhesive film storage box of FIG. 13 . 1 is a table showing the conditions and results of evaluation of examples. 1 is a graph showing the results of evaluation of examples.

The following is a detailed description of an embodiment of the present invention. Note that the following embodiment is an example for explaining the present invention, and the present invention is not limited to the embodiment. The same elements are given the same reference numerals, and duplicate explanations will be omitted. In addition, unless otherwise specified, the positional relationships such as up, down, left, and right in the drawings are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the ratios shown in the drawings.

Figure 1 is a perspective view showing an example of an adhesive film storage device 1 according to this embodiment. Figure 2 is a perspective view of the adhesive film storage device 1 in an unsealed state.

The adhesive film storage device 1 has an adhesive film storage box 10 and a roll 11 of adhesive film F.

<Configuration of adhesive film storage box>
The adhesive film storage box 10 has, for example, a rectangular parallelepiped shape as a whole. The adhesive film storage box 10 has a main body 20 and a lid 21 as shown in Figures 3 and 4. The main body 20 has, for example, a front panel 30, a bottom panel 31, a rear panel 32, a front panel side piece 33, a side panel 34, an extension piece 35, a rear panel side piece 36, etc. The front panel 30 has a folded back panel 37 that defines the inner surface of the front panel 30, and an outer panel 38 that defines the outer surface of the front panel 30. The lid 21 has, for example, a top panel 40, a cover piece 41, a top panel side piece 42, a cover side piece 43, an opening piece 44, etc.

The main body 20 is formed in a rectangular parallelepiped shape with an open top as shown in FIG. 3. The front plate 30, bottom plate 31, rear plate 32, and side plate 34 are each formed in a rectangular shape and constitute the five faces of the main body 20.

As shown in FIG. 4, the rear panel side piece 36 is connected to both ends of the rear panel 32 in the left-right direction (longitudinal direction) (direction A in FIG. 4). The front panel side piece 33 is connected to both ends of the front panel 30 in the left-right direction. The folded back panel 37 is connected to one end of the outer panel 38 of the front panel 30 in the width direction (short direction) (direction B in FIG. 4). As shown in FIG. 3, the rear panel side piece 36 is folded back to the side panel 34 side, covers the outer surface of the side panel 34, and is bonded to the outer surface of the side panel 34. The front panel side piece 33 is folded back to the side panel 34 side and is interposed between the rear panel side piece 36 and the side panel 34, and is bonded to the outer surface of the side panel 34. The folded back panel 37 is folded back to the back side of the front panel 30 and bonded to the back surface of the outer panel 38 of the front panel 30. The folded back panel 37 may or may not be present.

The extension piece 35 is formed in a generally rectangular plate shape as shown in FIG. 4, and is connected to the outer longitudinal ends of each side plate 34 on both sides. As shown in FIGS. 3, 5, and 6, the extension piece 35 is folded from the upper part of the side plate 34 into the inside of the main body 20 and extends toward the center of the main body 20.

As shown in Figures 2 and 6, the extension pieces 35 extend from the upper ends of the side plates 34 into the inside of the core tube 100 of the roll 11 in the main body 20, and can push the roll 11 toward the center from both ends. When assembling the adhesive film storage device 1, the roll 11 is stored in the main body 20 from above as shown in Figure 3, so that the extension pieces 35 enter the inside of the core tube 100 of the roll 11.

As shown in FIG. 5, a protrusion 60 is formed at the center of the upper end of each side plate 34, protruding outward from the side plate 34. The protrusion 60 is formed by forming a cut 61 in the upper part of the side plate 34 as shown in FIG. 4 and raising the inner area of the cut 61. A dotted cut line 62 is formed at the base end of the protrusion 60 (the upper end of the side plate 34), and the protrusion 60 is bent outward. With this configuration, the protrusion 60 abuts against the inner surface of the lid 21 when the opening of the main body 20 is closed as shown in FIG. 6.

As shown in FIG. 5, a folded portion 70 is formed in the center of each side plate 34, protruding into the main body 20. The folded portion 70 is formed, for example, in a downwardly protruding tongue shape (approximately semicircular shape), and a fold line 71 is formed at the upper end. The folded portion 70 is folded into the core tube 100 of the wound body 11, and the wound body 11 is held by this folded portion 70, thereby preventing the wound body 11 from popping out of the main body 20. An opening 72 is formed in the side plate 34 by folding the folded portion 70, but this opening 72 is closed by the rear plate side piece 36 or the front plate side piece 33.

3 to 5, the rear plate 32 and the side plate 34 are formed to have approximately the same height, and the front plate 30 is formed to be lower than the rear plate 32 and the side plate 34. The front plate 30 is formed in a rectangular plate shape with a constant height along the longitudinal direction of the adhesive film storage box 10. As shown in FIG. 7, the front plate 30 has a height H that is, for example, 50% to 90%, preferably 55% to 85%, and more preferably 60% to 80% of the outer diameter R2 of the core tube 100 of the roll 11. The height H of the front plate 30 may be less than half the height of the rear plate 32 and the side plate 34. The vertical width of the opening on the front surface of the main body 20, which is caused by the low height of the front plate 30, may be more than half the height of the rear plate 32 and the side plate 34. As shown in FIG. 3, a slit that curves downwardly convexly may be formed in the center of the front plate 30, thereby forming a knob piece 110. The knob piece 110 has a lower portion that protrudes forward and holds the tip of the adhesive film F.

As shown in FIG. 7, the top plate 40 of the lid portion 21 extends forward from the upper edge of the rear plate 32 to cover the top surface of the main body portion 20. The cover piece 41 extends from the front edge of the top plate 40 to the front surface (front plate 30). The tip of the cover piece 41 overlaps at least a portion of the front plate 30. For example, a saw-like cutting blade 90 is provided on the back side of the tip of the cover piece 41 as a cutting part for cutting the adhesive film F pulled out from the roll 11 inside the main body portion 20, as shown in FIG. 2 and FIG. 3.

As shown in FIG. 1, before the adhesive film storage device 1 is used, the adhesive film storage box 10 is sealed by an opening piece 44 connected to the tip of the cover piece 41 of the lid portion 21. The opening piece 44 is located on the front surface of the front plate 30 of the main body portion 20, and is formed in a strip shape along the longitudinal direction of the adhesive film storage box 10. The opening piece 44 is connected to the tip of the cover piece 41 via a cut line 91 so that it can be cut off, and is also adhered to multiple points on the surface of the front plate 30. When opening the adhesive film storage box 10, the lid portion 21 can be opened by cutting off the opening piece 44 along the longitudinal direction of the box, as shown in FIG. 8.

<Tack strength adjustment part>
As shown in FIG. 4, the front plate 30 has a tack force adjusting portion 120 (hatched area in FIG. 4). The tack force adjusting portion 120 is configured to satisfy L>T×6 when the loop stiffness of the adhesive film F is L (mN/25 mm) and the tack force between the adhesive film F and the portion of the front plate 30 that contacts the pulled-out adhesive film F is T (N/300 mm ² ). The tack force adjusting portion 120 is preferably configured to satisfy L>T×12. By configuring in this way, it becomes easier to open the lid portion 21 after the film is cut and pick up the adhesive film F that is sandwiched between the cover piece 41 and the front plate 30 and stuck to the front plate 30 again. The tack force adjusting portion 120 is also preferably configured to satisfy T×120>L. With this configuration, when the film is cut, the lid 21 is closed and the adhesive film F is sandwiched between the front plate 30 and the cover piece 41 of the adhesive film storage box 10, so that the adhesive film F is easily attached to the front plate 30. As a result, the adhesive film F is less likely to shift when cut, and stable cutting is possible. In addition, since the adhesive film F sticks to the front plate 30 for a predetermined time after cutting, even if the lid 21 is opened immediately after cutting, the tip of the adhesive film F is prevented from being rolled back into the box due to wind pressure.

The tack force T represents the force required to separate the front plate 30 and the adhesive film F. The tack force T was measured as follows. The tack force T is measured using a tackiness measurement unit in a static friction measuring instrument (TL201Tt) manufactured by Trinity Lab. First, a ring-shaped ring with a diameter of 50 mm is prepared. The adhesive film F (wound object) is attached to the outer periphery of the ring (cylinder) without wrinkles, with the surface that contacts the front plate 30 during use facing outward. Next, the front plate 30 (a sample of the same container piece as the front plate) is cut into a circle with a diameter of 19.5 mm, and is attached to the tip of a circular disk contactor with a diameter of 20 mm, with the surface that contacts the adhesive film F facing outward. The distance between the disk contactor and the adhesive film F is adjusted in advance so that the pressing load is 500±20 gf. The disk contactor is moved 10 mm in distance, moved at a speed of 10 mm/sec in repeat mode, and moved back and forth once, pushing into the center of the adhesive film F of the circle ring and then returning. The maximum load in the load cell tensile direction during the return movement is measured as the tack force T data. This measurement is performed in an atmosphere of 23±1°C and 50±5% RH. The maximum load in the load cell tensile direction during the return movement is measured five times, and the average value is taken as the tack force T (between the adhesive film F and the part of the front plate 30 that comes into contact with the adhesive film F being pulled out).

The tack force T is 0.7 N/300 ^mm2 or less, and more preferably 0.6 N/300 ^mm2 or less. This configuration makes it easier to pick up the tape from the box surface. The tack force T is 0.01 N/300 ^mm2 or more, and more preferably 0.03 N/300 mm2 or ^more . This configuration makes it easier to stably attach the tape to a keyboard or touch panel.

Loop stiffness L represents the stress when the adhesive film F is folded into a loop with a circumference of 50 mm and compressed in the diameter direction of the loop. Loop stiffness L is measured as follows. Loop stiffness L is measured using a loop stiffness tester manufactured by Toyo Seiki. First, the adhesive film F (rolled sample) is cut into a strip with a dimension of 100 mm in the direction parallel to the unwinding direction (MD direction) and 25 mm in the direction perpendicular to the MD direction (TD direction). Next, the strip-shaped adhesive film F is set in the loop stiffness tester so that the surface that contacts the front panel 30 during use is the inside of the loop. The loop stiffness tester presses approximately the center of the loop of the adhesive film F under the conditions of a loop circumference of 50 mm, a pressing speed of 5 mm/sec, and a pressing amount of 10 mm, and the maximum load at this time is measured as the data of loop stiffness L. This measurement is performed in an atmosphere of 23±1°C and 50±5% RH. The maximum value of this load is measured five times, and the average value is taken as the loop stiffness L. Normally, the loop stiffness L is measured for one loop-shaped adhesive film F, but if the loop stiffness L value per sheet is below the lower limit of measurement, multiple loop-shaped adhesive films F are stacked and measured, and the measured value is divided by the number of sheets stacked to determine the measured value of the adhesive film F. If the adhesiveness and adhesion of the adhesive film F interfere with loop formation, the adhesive film F is measured with a thin layer of talc (manufactured by Kanto Chemical Co., Ltd.) applied to its adhesive and adhesive surfaces.

The loop stiffness L is 10 mN/25 mm or less, and more preferably 6 mN/25 mm or less. This configuration makes it easier to follow the curved parts of a keyboard or touch panel. In addition, the loop stiffness L is 0.3 mN/25 mm or more, and more preferably 1.0 mN/25 mm or more. This configuration makes it easier to pick up the box surface.

The tack force adjustment portion 120 is formed on the entire front surface (shaded area in FIG. 4) of the front panel 30 (front surface of the outer panel 38). The tack force adjustment portion 120 is formed, for example, by surface-treating the front panel 30 or by uneven processing. Surface processing includes applying a silicone coat or varnish to the front panel 30. Uneven processing includes embossing or forming lines on the front panel 30. The tack force adjustment portion 120 may be formed by either surface processing or uneven processing, or by both surface processing and uneven processing.

For example, when the tack force adjustment section 120 is formed by applying varnish, the tack force T can be adjusted by adjusting the amount of UV irradiation of the varnished section, film formation conditions such as drying speed, plate depth of the varnished section, pattern of the varnished section, and varnish components.

The varnish used in the varnished portion is an active energy ray-curable resin composition that undergoes radical polymerization and hardening when exposed to active energy rays such as ultraviolet rays and electron beams, and contains an active energy ray-curable resin. The active energy ray-curable resin contains a compound having an ethylenically unsaturated double bond. Below, we will explain the ultraviolet ray-curable resin composition and the ultraviolet ray-curable resin that undergoes radical polymerization and hardening when exposed to ultraviolet rays.

The UV-curable resin consists of an oligomer or a monomer, or an oligomer and a monomer.

Oligomers impart resistance and flexibility to the varnish coating layer, and examples include urethane acrylates, polyester acrylates, acrylic acrylates, and epoxy acrylates that have (meth)acrylate groups.

Monomers are added to improve the physical properties of the varnish coating layer and to adjust the viscosity of the UV-curable resin composition, and examples of such monomers include monofunctional, bifunctional, and polyfunctional monomers having (meth)acrylate groups.

Monofunctional monomers include 2-(2-ethoxyethoxy)ethyl acrylate, stearyl acrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, 2-phenoxyethyl acrylate, indecyl acrylate, isoctyl acrylate, tridecyl acrylate, caprolactone acrylate, 4-hydroxybutyl acrylate, ethoxylated nonylphenol acrylate, propoxylated nonylphenol acrylate, phenoxyethyl acrylate, phenoxydiethylene acrylate, ethylene oxide modified nonylphenyl acrylate, methoxytriethylene glycol acrylate, ethylene oxide 2-ethylhexyl acrylate, isobornyl acrylate, dipropylene glycol acrylate, and the like, as well as methacrylate monomers thereof.

Examples of bifunctional monomers include 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, neopentyl glycol diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated neopentyl glycol diacrylate, hydroxypivalic acid neopentyl glycol diacrylate, (hydrogenated) bisphenol A diacrylate, (hydrogenated) ethylene oxide-modified bisphenol A diacrylate, (hydrogenated) propylene glycol-modified bisphenol A diacrylate, 1,6-hexanediol diacrylate, 2-ethyl,2-butyl-propanediol diacrylate, and 1,9-nonanediol diacrylate, as well as methacrylate monomers thereof.

Examples of polyfunctional monomers include tris(2-hydroxyethyl)isocyanurate triacrylate, ethylene oxide modified trimethylolpropane triacrylate, propylene oxide modified trimethylolpropane triacrylate, propylene oxide modified glyceryl triacrylate, pentaerythritol triacrylate, trimethylolpropane acrylate, ethylene oxide modified trimethylolpropane acrylate, propylene oxide modified trimethylolpropane acrylate, tris(acryloxyethyl)isocyanurate, pentaerythritol tetraacrylate, ditrimethylolpropane tetraacrylate, dipentaerythritol hydroxypentaacrylate, ethoxylated pentaerythritol tetraacrylate, pentaacrylate ester, dipentaerythritol hexaacrylate, and methacrylate monomers thereof.

In terms of film properties, it is preferable for the UV-curable resin to contain 0-80% by weight of oligomer and 20-100% by weight of monomer.

When the radically polymerizable crosslinking component is crosslinked by ultraviolet light, acetophenones, benzophenones, thioxanthones, aromatic diazonium salts, metallocenes, etc. can be used as photopolymerization initiators. It is also possible to use a polymerization accelerator in combination, and examples of the polymerization accelerator include amines and phosphines.

In addition, the varnish applied to the varnished area may, for example, be one that creates an uneven surface on the coating film by adding a filler of a certain particle size in a certain ratio. This allows the tackiness to be adjusted to an appropriate level.

As for varnishes, those that use polysiloxane containing silanol groups at the ends as the base polymer, called condensation type, mixed with polymethylhydrogensiloxane as a crosslinking agent and reacted in the presence of an organotin acylate catalyst, those that use polysiloxane containing vinyl groups as the base polymer, called addition type, mixed with polymethylhydrogensiloxane as a crosslinking agent and reacted in the presence of a platinum catalyst, or those that use 3-4 functional silanols, called silicone resins, to form a three-dimensional network structure by condensation, are also suitable.

(Ultraviolet curing method)
As a method for curing the ultraviolet-curable resin composition by ultraviolet irradiation, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, a chemical lamp, an electrodeless discharge lamp, an LED, or the like that emits light in the wavelength range of 150 to 450 nm may be used, and irradiation may be performed at 30 to 5000 mJ/cm2, preferably 100 to 1000 mJ/cm2. After ultraviolet irradiation, the ultraviolet-curable resin composition may be heated as necessary to completely cure it. The film thickness (film thickness after curing) when applying the ultraviolet-curable resin composition is usually preferably 1 to 80 μm, more preferably 3 to 60 μm, and particularly preferably 5 to 50 μm. If the film thickness is in the range of 1 to 80 μm, there is no curing inhibition, the irradiation time of ultraviolet light can be shortened, and productivity is good. In addition, from the viewpoint of improving the smoothness and gloss of the coating surface, it is preferable to adjust the application conditions so that the film thickness when applying the ultraviolet-curable resin composition is 10 μm or more.

When the tack force adjustment portion 120 is formed by uneven processing, the tack force T can be adjusted by adjusting the height of the embossed convex portion, the depth of the convex portion, the dimensions of the embossment, the density, etc. Each convex portion has a step of 0.05 mm or more, preferably 0.1 mm or more and 0.3 mm or less. The diameter of each convex portion 130 is 0.5 mm or more and 10 mm or less, preferably 1 mm or more and 8 mm or less, more preferably 2 mm or more and 6 mm or less. If the diameter of the convex portion 130 is 0.5 mm or more, the crease on the paper surface is less likely to occur, and the step of the convex portion 130 is easily produced stably. If the diameter of the convex portion 130 is 10 mm or less, the contact area with the adhesive film F can be efficiently reduced. In addition, the interval between adjacent convex portions 130 is preferably 2 mm or more and 6 mm or less, more preferably 3 mm or more and 5 mm or less. If the interval between the convex portions 130 is 2 mm or more, the crease on the paper surface is less likely to occur, and if it is 6 mm or less, the tack force can be reduced.

Examples of base paper that constitutes the adhesive film storage box 10 include cardboard, coated cardboard, corrugated cardboard, etc., but are not limited to these, and any paper known in the industry can be appropriately selected and used.

<Rolled body>
As shown in FIG. 3, the roll 11 is configured by winding a long adhesive film F around a cylindrical core tube 100 made of paper.

The wound body 11 has a longitudinal width of, for example, 100 mm or more, and the diameter of the core tube 100 is approximately 25 mm to 40 mm.

The wound body 11 may be one in which the length of the core tube 100 and the adhesive film F in the longitudinal direction A are the same and the end faces of the core tube 100 and the adhesive film F are aligned, or one in which the length of the core tube 100 in the longitudinal direction A is longer than the length of the adhesive film F in the width direction (TD direction A) and the end faces of the core tube 100 and the adhesive film F are misaligned. The former is, for example, when the adhesive film F is wound around a sufficiently long core tube 100 and then the core tube 100 is cut to produce a wound body 11 of a predetermined length, and the latter is, for example, when the adhesive film F is wound around a core tube 100 that has been cut to a predetermined length to produce the wound body 11.

<Adhesive film>
The adhesive film F is an adhesive film such as an infection prevention film. The infection prevention film refers to a film that prevents the adhesion of bacteria and viruses, blood, vomit, and other bodily fluids to electronic medical record keyboards and various testing equipment with operation panels that are touched by multiple medical personnel in a hospital, thereby preventing cross-infection between medical personnel.

The adhesive film F has an adhesive strength (peel adhesion to a stainless steel test plate, peel angle 180 degrees, test temperature 23±1°C, humidity 50±5%) of 0.01 N/25 mm or more and 1.5 N/25 mm or less, based on JIS Z0237:2009. The adhesive film F may have an adhesive strength of 0.03 N/25 mm or more and 1.0 N/25 mm or less, more preferably 0.1 N/25 mm or more and 0.5 N/25 mm or less. When the back surfaces of the adhesive film are adhesive to each other, the adhesive strength of the adhesive film is determined by measuring the value measured after applying a thin layer of talc (manufactured by Kanto Chemical Co., Ltd.) to the back surface. The lower limit of the adhesive strength of the adhesive film F is preferably 0.03 N/25 mm or more, more preferably 0.1 N/25 mm or more. This configuration makes it easy to attach to keyboards and touch panels. In addition, the upper limit of the adhesive strength of the adhesive film F is preferably 1.0 N/25 mm or less, more preferably 0.5 N/25 mm or less. By configuring it in this way, it is less likely to damage the keyboard or touch panel surface, and it is easier to prevent the adhesive film F from tearing when peeling it off.

The loop stiffness L of the adhesive film F is preferably 0.3 mN/25 mm or more and 10 mN/25 mm or less. The value of the loop stiffness L can be adjusted by adjusting the stiffness of the base film of the adhesive film F, the thickness of the base film, and, if there is an adhesive layer, the thickness of the adhesive layer.

It is preferable that the adhesive film F includes an adhesive layer at least in a portion thereof. The adhesive constituting the adhesive layer is not particularly limited, but examples thereof include acrylic adhesives, rubber adhesives, silicone adhesives, and urethane adhesives. Among these, acrylic adhesives and urethane adhesives are preferred, and acrylic adhesives are particularly preferred.

In acrylic adhesives, the cohesive strength can be adjusted by adding a comonomer to the main monomer, or a functional group-containing monomer can be added to provide crosslinking points to adjust the hardness of the adhesive and achieve the desired adhesive strength. The main monomer is not particularly limited, but examples include various alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate, and these can be used alone or in combination. The comonomer is not particularly limited, but examples include vinyl acetate, acrylonitrile, acrylamide, styrene, methyl methacrylate, and methyl acrylate. The functional group-containing monomer is not particularly limited, but examples include acrylic acid, hydroxyethyl acrylate, acrylamide, and glycidyl methacrylate. In addition, tackifiers such as rosin, terpenes, and aliphatic and aromatic synthetic resins can be added to adjust the adhesive strength. In addition, stabilizers, antioxidants, light stabilizers, and ultraviolet absorbing agents may be added to the adhesive.

The adhesive film F also includes a base film. The main component of the base film is not particularly limited.

The base film in this embodiment preferably contains a vinylidene chloride copolymer as a main component. It preferably contains 75 to 96% by mass of vinylidene chloride monomer units, 100 parts by mass of the vinylidene chloride copolymer, and 1 to 20 parts by mass of a mixture of fatty acid esters and an epoxy compound. The mixture of fatty acid esters and an epoxy compound is more preferably 1 to 15 parts by mass, and even more preferably 1 to 10 parts by mass, relative to 100 parts by mass of the vinylidene chloride copolymer.

In addition, the base film in this embodiment may contain a resin other than a vinylidene chloride copolymer, but the resin contained in the base film is preferably a vinylidene chloride copolymer.

The thickness of the substrate film in this embodiment is preferably 5 to 45 μm, more preferably 10 to 30 μm, and even more preferably 15 to 30 μm, from the viewpoints of wettability and spreadability, and operability and durability of personal computers and medical devices.

In addition, the base film in this embodiment preferably has a 2% strain modulus in the machine direction (MD) and a 2% strain modulus in the width direction (TD), each of which is 190 to 400 MPa, and a tensile elongation in the machine direction (MD) and width direction (TD), each of which is 80 to 150%.

The adhesive film of this embodiment has a 2% strain elastic modulus of 190 to 400 MPa for the base film, making the film less likely to stretch and tear. The adhesive film of this embodiment has a tensile elongation of 80 to 150% for the base film, making the film less likely to stretch and tear.

The base film used in this embodiment has a 2% strain elastic modulus in the machine direction (MD) of preferably 190 to 350 MPa, and even more preferably 200 to 300 MPa. The base film used in this embodiment has a 2% strain elastic modulus in the width direction (TD) of preferably 190 to 350 MPa, and even more preferably 190 to 300 MPa.

Moreover, the base film used in this embodiment has a tensile elongation in the machine direction (MD) of 90 to 140%, more preferably 90 to 130%. Furthermore, the base film used in this embodiment has a tensile elongation in the width direction (TD) of 80 to 140%, more preferably 90 to 130%.

When using the adhesive film storage device 1 configured as above, first, the opening piece 44 is cut off as shown in FIG. 8, and the adhesive film storage box 10 is opened. Next, the adhesive film F of the roll 11 is pulled out to the front side of the adhesive film storage box 10. At this time, as shown in FIG. 7, the pulled-out adhesive film F is curled so as to be curved convexly toward the front panel 30 side. Then, with the lid 21 closed, for example, the adhesive film F is pulled upward relative to the adhesive film storage box 10, and the adhesive film F is cut to a predetermined length by the cutting blade 90.

Methods for forming an adhesive film F that curls convexly on the front plate 30 side include performing a heat set treatment only on the side of the adhesive film F or base film opposite the side that contacts the front plate 30, forming an adhesive layer at a temperature higher than the processing temperature during molding of the base film, etc. Methods for forming an adhesive film F that curls convexly on the side opposite the front plate 30 include performing a heat set treatment only on the side of the adhesive film F or base film opposite the side that contacts the front plate 30, etc.

After cutting, the adhesive film F is temporarily adhered to the front surface of the front plate 30 as shown in FIG. 9. After a predetermined time, for example, one second or more, has elapsed, the adhesive film F naturally peels off from the front plate 30 as shown in FIG. 10, and curls convexly toward the front plate 30, for example.

According to this embodiment, the front plate 30 of the adhesive film storage box 10 is equipped with a tack force adjustment section 120 configured to satisfy the loop stiffness L of the adhesive film F > tack force T x 6. By doing so, the peel force between the adhesive film F and the front plate 30 becomes lower than the bending stiffness of the adhesive film F, so that the adhesive film F naturally floats up from the front plate 30 after adhering to the front plate 30. As a result, during use, the adhesive film F and the front plate 30 do not stick to each other, and the user can appropriately pick up the adhesive film F.

The tack force adjustment unit 120 is configured to satisfy L>T×12, so that the peel force between the adhesive film F and the front plate 30 is lower than the bending rigidity of the adhesive film F. As a result, when in use, the adhesive film F and the front plate 30 do not adhere more securely to each other, and the user can appropriately pick up the adhesive film F.

The tack force adjustment section 120 is provided on the entire front surface of the front plate 30. This allows the adhesive film F to naturally peel off from the front plate 30 regardless of where it is attached to the front plate 30. As a result, adhesion between the adhesive film F and the front plate 30 during use is more reliably prevented, allowing the user to properly pick up the adhesive film F.

The adhesive film F that is pulled out is curled convexly toward the front plate 30, making it easier for the adhesive film F to peel off from the front plate 30 and easier for the user to grasp the adhesive film F. The adhesive film F that is pulled out may be curled so as to curve convexly toward the opposite side of the front plate 30. The adhesive film F that is pulled out does not have to be curled.

The above describes preferred embodiments of the present invention with reference to the attached drawings, but the present invention is not limited to these examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

For example, in the above embodiment, the tack force adjustment unit 120 may be provided on a part of the front surface of the front panel 30. The tack force adjustment unit 120 may be provided on a part of the front surface of the front panel 30 in a rectangular region. The rectangular region may have a vertical width equal to the height of the front panel 30, or may have a vertical width shorter than the height of the front panel 30. The rectangular region may have a left-right width equal to the longitudinal length of the front panel 30, or may have a left-right width shorter than the longitudinal length of the front panel 30. The tack force adjustment unit 120 is not limited to a rectangular shape, and may be provided in a circular region. The circular region may be provided in multiple places on the front panel 30. The tack force adjustment unit 120 may be provided on the back side of the front panel 30. When provided on the back surface of the tack force adjustment unit 120, it may be provided in a rectangular region, a circular region, or the like, as described above.

The shape of the front plate 30 is not limited to that of the above embodiment. For example, the front plate 30 may have a height that varies along the longitudinal direction A as shown in FIG. 11 and FIG. 12. The front plate 30 may have a first region 130a near the center, a second region 130b on both sides of the first region 130a, and a third region 130c on both sides of the second region 130b. The height of the second region 130b is higher than the height of the first region 130a and the third region 130c. In such a case, the tack force adjustment portion 120 may be formed on the entire front surface of the front plate 30 (the entire first region 130a, the second region 130b, and the third region 130c). The tack force adjustment portion 120 may be formed on a part of the front surface of the front plate 30 (at least one of the first region 130a, the second region 130b, and the third region 130c).

The front panel 30 may have the same height as the rear panel 32 and the side panel 34, as shown in Figures 13 and 14. In such a case, the tack force adjustment section 120 may be formed on the entire front surface of the front panel 30. The tack force adjustment section 120 may be formed on a part of the front surface of the front panel 30. The tack force adjustment section 120 may be formed in a long rectangular shape in the longitudinal direction A at the top near the center of the front surface of the front panel 30.

The configuration of the adhesive film storage box 10 described in the above embodiment is not limited to this. For example, the present invention can be applied to a box that does not have the extension piece 35, the tab piece 110, etc.

The adhesive film F was evaluated for lifting from the front plate 30 of the adhesive film storage box 10. The evaluation was performed as follows in an atmosphere of 23±1°C and 50±5% RH. A roll of the adhesive film was placed in the film storage box shown in Figures 11 and 12, the adhesive film was pulled out of the film storage box, the lid was closed, and the adhesive film was cut. The lid was then immediately opened, and the cut end of the adhesive film was observed to naturally lift from the front plate.

The evaluation is as follows: if the cut end of the adhesive film remains attached to the front plate and does not lift up even after 10 seconds, it is marked as "X", if part of the cut end of the adhesive film lifts up from the front plate within 10 seconds, it is marked as "O", and if part of the cut end of the adhesive film lifts up from the front plate within 3 seconds, it is marked as "◎".

The evaluation was carried out by varying the type of film substrate, the thickness of the film substrate, the type of adhesive, the thickness of the adhesive layer, the coating pattern of the adhesive layer, the total thickness of the film, the type of varnish on the front plate, and the method of applying the varnish, thereby varying the loop stiffness L and tack strength T of the adhesive film. The above evaluation was carried out under the conditions of the following Examples 1 to 8 and Comparative Examples 1 and 2. The results are shown in Figures 15 and 16.

Example 1
The adhesive film used had a film substrate type of PVDC (polyvinylidene chloride), a thickness of 25 μm, a type of adhesive of urethane type, a thickness of the adhesive layer of 25 μm, a coating pattern of the adhesive layer of solid coating, and a total thickness of 50 μm. The front plate of the film storage box used had a varnish type of peach feel varnish (manufactured by DIC) in the tack strength adjustment section, and the varnish was applied in a solid coating manner. The loop stiffness L of the adhesive film was 5.0 (mN/25 mm), and the tack strength T of the front plate of the film storage box was 0.05 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 3 seconds.

Example 2
The type of varnish used on the front plate of the film storage box was HTA-W (manufactured by T&K Toka). The varnish was applied by applying two coats of varnish as underprinting, and then applying a solid coat of temperature-adjusted varnish as overprinting. Other than that, the conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 5.0 (mN/25 mm), and the tack force T of the front plate of the film storage box was 0.26 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 3 seconds.

Example 3
The thickness of the film substrate of the adhesive film was 11 μm, the thickness of the adhesive layer was 11 μm, and the total thickness of the film was 22 μm. The other conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 2.0 (mN/25 mm), and the tack force T of the front plate of the film storage box was 0.05 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 3 seconds.

Example 4
The coating pattern of the adhesive layer of the adhesive film was a dot pattern, and the type of varnish on the front plate of the film storage box was a silicone coat. Other conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 2.5 (mN/25 mm), and the tack force T of the front plate of the film storage box was 0.14 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 3 seconds.

Example 5
The type of varnish on the front plate of the film storage box was silicone coated. Other conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 5.0 (mN/25 mm), and the tack strength T of the front plate of the film storage box was 0.51 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 10 seconds.

Example 6
The type of varnish on the front plate of the film storage box was GLA (manufactured by T&K TOKA). The varnish was applied by applying two coats of varnish as underprinting and a solid coat of varnish as overprinting. Other conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 5.0 (mN/25 mm), and the tack strength T of the front plate of the film storage box was 0.45 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 10 seconds.

(Example 7)
The thickness of the film substrate of the adhesive film was 15 μm, the thickness of the adhesive layer was 15 μm, and the total thickness of the film was 30 μm. The type of varnish on the front plate of the film storage box was silicone coat. Other than that, the conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 3.3 (mN/25 mm), and the tack force T of the front plate of the film storage box was 0.5 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 10 seconds.

(Example 8)
The type of film base material of the adhesive film was PE. The type of varnish on the front plate of the film storage box was GLA (manufactured by T&K TOKA). Other conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 2.0 (mN/25 mm), and the tack strength T of the front plate of the film storage box was 0.26 (N/300 mm ² ). In the evaluation, the adhesive film lifted off the front plate within 10 seconds.

(Comparative Example 1)
The thickness of the adhesive layer of the adhesive film was 20 μm, and the total thickness of the film was 45 μm. The type of varnish on the front plate of the film storage box was UV HJK underprint G (manufactured by T&K TOKA). Other conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 4.5 (mN/25 mm), and the tack force T of the front plate of the film storage box was 0.8 (N/300 mm ² ). In the evaluation, the adhesive film did not separate from the front plate even after 10 seconds.

(Comparative Example 2)
The thickness of the film substrate of the adhesive film was 11 μm, the thickness of the adhesive layer was 11 μm, and the total thickness of the film was 22 μm. The type of varnish on the front plate of the film storage box was HTA-W (manufactured by T&K Toka). Other than that, the conditions were the same as in Example 1. The loop stiffness L of the adhesive film was 2.0 (mN/25 mm), and the tack force T of the front plate of the film storage box was 0.45 (N/300 mm ² ). In the evaluation, the adhesive film did not separate from the front plate even after 10 seconds.

As shown in Figure 16, it was confirmed that the adhesive film naturally detaches from the front plate when loop stiffness L > tack force T x 6 is satisfied. It was also confirmed that the adhesive film detaches even more from the front plate when loop stiffness L > tack force T x 12 is satisfied.

The present invention is useful in providing an adhesive film storage box and an adhesive film storage device that allow the user to properly pick up the adhesive film when in use.

REFERENCE SIGNS LIST 1 adhesive film storage device 10 adhesive film storage box 11 roll 20 main body 21 lid 30 front plate 31 bottom plate 32 rear plate 34 side plate 120 tack strength adjustment section F adhesive film L loop stiffness T tack strength

Claims (6)

An adhesive film storage box for storing a roll of an adhesive film,
A main body having at least a front plate, a bottom plate, a rear plate, and a side plate, and an open top surface;
a cover portion capable of opening and closing an opening on an upper surface of the main body portion,
The loop stiffness of the adhesive film when the circumferential length of the adhesive film is 50 mm is L (mN / 25 mm),
When the tack force between the adhesive film and the portion of the front plate that comes into contact with the adhesive film being pulled out is T (N/300 mm ² ),
The adhesive film storage box has a tack force adjustment portion configured so that the front panel satisfies L>T×6. The adhesive film storage box according to claim 1, wherein the tack force adjustment section is configured to satisfy L>T×12. The adhesive film storage box according to claim 1 or 2, wherein the tack force adjustment portion is provided on a part or the entire front surface of the front panel. An adhesive film storage box according to any one of claims 1 to 3, wherein the adhesive film has an adhesiveness of 0.01 N/25 mm or more. An adhesive film storage box according to any one of claims 1 to 4,
a roll of adhesive film stored in the adhesive film storage box. The adhesive film storage device according to claim 5, wherein the adhesive film being pulled out is curled convexly toward the front plate or convexly toward the opposite side of the front plate.

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