JP6009540B2 - Method for separating members using laser light - Google Patents

Description

  The present invention relates to a separation method in which a first member and a second member that are bonded in advance with an adhesive tape are separated using laser light.

  Conventionally, for example, an adhesive tape having an adhesive layer is used when two members are joined. Unlike adhesives, adhesive tapes do not require curing time, and can instantly bond two members and avoid separation when impacted after bonding due to their low elastic modulus. Since there is an advantage that it can be used, its application range is wide. For example, it is widely used in the manufacturing site of household goods, office supplies, home appliances, electronic products, automobiles and the like. In this way, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape used in various situations is composed of a pressure-sensitive adhesive, and as this pressure-sensitive adhesive, it exerts a strong adhesive force after bonding and maintains it for a long period of time. What can be used is used.

  By the way, there is a case where the product bonded by the adhesive tape is defective. In this case, one member is temporarily separated from the other member and bonded again, and so-called rework is required. In the event of damage, so-called repair may be performed, in which only the damaged member is replaced, and the product obtained by bonding a plurality of members is disassembled and recovered as a reusable resource, and then the product is reused. So-called recycling may be necessary.

  When performing the above-described rework, repair, and recycling, if the adhesive force of the adhesive tape is strong, it may be difficult to separate one member from the other member. In such a case, it is possible to use a solvent, surfactant, acid, alkali chemicals, etc. to infiltrate the adhesive part and lubricate, or heat the entire product to soften and peel off the adhesive layer. Generally done.

  However, in the case of an electronic product such as a mobile phone, particularly a smartphone, for example, after the casing and the electronic component are bonded to each other with an adhesive tape to produce a product, the above-mentioned drugs and the like can be used from the viewpoint of protecting each component. In addition, from the viewpoint of reusing components that are vulnerable to heat, such as ICs, the whole cannot be heated, and separation of members becomes very difficult.

  Therefore, for example, it is conceivable to bond the members using a releasable adhesive tape disclosed in Patent Documents 1 and 2. However, the general purpose of use of the pressure-sensitive adhesive tape at the manufacturing site is to obtain a strong adhesive force, and a re-peelable pressure-sensitive adhesive tape has insufficient adhesive force and may not be a product.

  In addition, the present inventors irradiate the intermediate member by irradiating the same portion with the laser beam again after irradiating the laser beam with the intermediate member sandwiched between the two members and joining the two members. A method of separating one member from the other member by softening, melting, etc. has been invented first, and this has been filed as Japanese Patent Application No. 2010-208304.

JP 2009-209223 A JP 2012-7047 A

  In the invention according to the above Japanese Patent Application No. 2010-208304, the intermediate member is made of a hot melt material, which is effective in that the intermediate member can be melted and separated by irradiation with laser light. However, in actual manufacturing sites, generally, industrial, electrical, electronic and household commercial adhesive tapes are overwhelmingly used, and when these are used, there is a need for a method for efficiently separating members. It was done.

  In particular, for smartphones and the like, the price of electronic components is high, and there is a high demand for reusing parts (members) that are free from defects during rework and repair after bonding with an adhesive tape.

  However, the pressure-sensitive adhesive layer of a general pressure-sensitive adhesive tape employs a method of increasing the cross-linking density using heat or ultraviolet rays in order to improve the cohesive force. Have difficulty.

  In addition to electronic products such as smartphones, there are demands in various fields for separating members that are strongly bonded using an adhesive tape without damaging them.

  This invention is made | formed in view of this point, The place made into the objective is to enable it to isolate | separate easily the member adhere | attached using the adhesive tape.

  The present inventors have found that the adhesive strength can be easily reduced by changing the state of the pressure-sensitive adhesive layer by using laser light, and have led to the present invention.

1st invention is the separation method which isolate | separates the transparent 1st member and opaque 2nd member which were adhere | attached with the adhesive tape,
Above the peripheral edge portion of the surface of the second member side of the first member, printed layer or metal deposition film is laser light non-transmissive portion are formed, the adhesive tape adjacent to the laser beam non-transmitting portion The pressure-sensitive adhesive layer is disposed, and the laser light non-transparent portion is irradiated with laser light from the side opposite to the second member in the first member to generate heat, and this heat softens the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape. The first member and the second member are separated by reducing the adhesive force of the adhesive layer in at least one of melting, foaming and decomposition.

  According to this configuration, the laser beam non-transmitting portion generates heat by absorbing the laser beam. By softening the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape by this heat, the adhesive force of the pressure-sensitive adhesive layer is reduced, and the first member and the second member can be separated.

  Therefore, when a general adhesive tape having a strong adhesive force is used, the members can be separated without using a chemical such as a solvent. Furthermore, since the laser beam can be selectively applied only to a portion that needs to be heated, it is possible to minimize the influence of heat on heat-sensitive components such as electronic components (liquid crystal substrates, touch panel devices). .

Further , since the printed portion has a shielding property for shielding the laser beam, the laser beam non-transparent portion can absorb the laser beam with certainty and generate heat.

According to a second invention, in the first invention, the laser light non-transmitting portion is made of a colored resin that transmits at least 5% of the laser light.

  According to this configuration, when the laser beam is irradiated, the laser beam non-transmitting portion is heated not only in the irradiation surface but also in the thickness direction. As a result, the amount of heat in the laser light non-transmitting portion increases, so that heat is easily transmitted to the adhesive layer of the adhesive tape, and the adhesive layer can be reliably softened.

According to a third invention, in the first invention, the laser light non-transmitting portion is made of a metal or a metal oxide.

  According to this configuration, when the laser beam is irradiated, the laser beam is reflected to some extent on the surface of the laser beam non-transmitting portion, but the rest is absorbed by the laser beam non-transmitting portion. As a result, the laser light non-transmitting part generates heat appropriately, and the adhesive layer of the adhesive tape can be surely softened.

According to a fourth invention, in any one of the first to third inventions, a force is applied to the adhesive layer of the adhesive tape in a direction to separate the first member and the second member, and in this state The laser light non-transmission part is irradiated with laser light.

  According to this configuration, since the force for separating the member always acts on the adhesive layer of the adhesive tape, the adhesive layer is peeled off in order from the softened part, and efficiently with a small amount of laser light irradiation. The members can be separated.

A fifth invention is characterized in that, in any one of the first to fourth inventions, the same portion is irradiated with a laser beam twice or more.

  According to this configuration, when heat cannot be stored by the first laser light irradiation, the heat storage amount can be increased by the second or third laser light irradiation to securely soften the adhesive layer of the adhesive tape. Become.

  Also, when the laser beam non-transmitting part is thick, it may take some time for heat conduction to the adhesive layer of the adhesive tape. In this case, the adhesive layer is gradually heated by irradiating the laser beam multiple times. Can be softened.

  Furthermore, when the laser beam non-transparent part is vulnerable to high heat, the adhesive layer can be gradually heated and softened without increasing the temperature of the laser light non-transparent part by irradiating the laser beam multiple times. Is possible.

  According to the first invention, the member can be easily separated by softening, melting, foaming and decomposing the adhesive layer of the adhesive tape using laser light, so that rework, repair, recycling Can be performed smoothly.

Further , since the laser light non-transmission part is configured by printing, the laser light non-transmission part can be reliably heated to reduce the adhesive force of the adhesive layer of the adhesive tape.

In the second invention, since the laser light non-transmitting portion is made of a colored resin that transmits at least 5% of the laser light, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape can be reliably softened, and the member can be reused. Can be reliably separated.

According to the third aspect of the invention, since the laser light non-transmissive portion is made of metal or metal oxide, the laser light non-transmissive portion can be heated appropriately, and the members can be reliably separated in a reusable form. .

According to the fourth invention, the force is applied to the adhesive layer of the adhesive tape in the direction of separating the first member and the second member, and the laser beam is irradiated in this state. It can be separated well.

According to the fifth aspect , since the same portion is irradiated with the laser beam twice or more, the heat storage amount can be gradually increased to surely soften the adhesive layer of the adhesive tape.

It is a perspective view of the product which adhere | attached the 1st member and the 2nd member with the adhesive tape. It is a disassembled perspective view of a product. It is an expanded sectional view of an adhesive tape. It is a perspective view of the 1st member in which the printing layer was formed. It is a perspective view of the 1st member which affixed the adhesive tape. It is a figure explaining the point which isolate | separates a 1st member and a 2nd member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(Embodiment 1)
FIG. 1 shows a product A in which a first member 10 and a second member 20 are bonded with an adhesive tape 30. When the first member 10 constituting the product A is separated from the second member 20, a laser beam L (shown in FIG. 6) is used.

  The first member 10 can be constituted by, for example, a transparent glass plate, a resin film, a resin sheet, or the like. The first member 10 is a rectangular glass plate in this embodiment, but the shape and material can be arbitrarily set. The first member 10 may be colorless and transparent, but may be lightly colored so that most of the laser light can be transmitted.

  FIG. 4 is a view of the first member 10 as seen from the back side (second member 20 side). As shown in this figure, the printed layer is formed on the peripheral portion of the surface of the first member 10 on the second member 20 side. 40 is provided. Thus, by providing the printing layer 40 on the surface of the first member 10 on the second member 20 side, the printing layer 40 and the adhesive tape 30 are adjacent to each other.

  The print layer 40 can be formed using various printing methods such as offset printing, gravure printing, and screen printing. The print layer 40 is a laser beam non-transmission part of the present invention. The laser light non-transmitting portion is a portion having a laser light absorption property that absorbs the laser light when irradiated with the laser light. Laser light absorption is a property of absorbing the remainder of the laser light even if it is partially transmitted and / or reflected, and includes that which absorbs all of the irradiated laser light. As a color of the printing layer 40, a dark color such as black is preferable as a color having a high shielding property for shielding laser light.

  The printing layer 40 is composed of a resin, a so-called binder, and a laser light absorber. As the binder, a general thermoplastic resin, thermosetting resin, ultraviolet curable resin, or the like can be used. Examples of the laser light absorber that can be used include organic pigments and organic dyes, commercially available laser light absorbers, carbon black, and the like.

  The print layer 40 may be provided for writing characters on the product A, decorating it, or coloring it.

  Moreover, you may provide a metal vapor deposition film in the peripheral part of the surface at the side of the 2nd member 20 in the 1st member 10 instead of the printing layer 40. FIG. This metal deposition film also has laser light absorption.

Moreover, although the 2nd member 20 is a board | plate material which consists of resin etc., you may comprise with a glass plate, a resin film, a resin sheet, etc., for example. The second member 20 may be opaque. Further, the shape of the second member 20 is not limited to the plate.

  As the adhesive tape 30, for example, an adhesive tape that is commercially available for industrial use, electrical use, electronic use, or home use can be used. As shown in FIG. 3A, the adhesive tape 30 is attached to one surface of the film-like substrate 30a. The single-sided adhesive tape provided with the layer 30b, or the double-sided adhesive tape provided with the adhesive layers 30b and 30b on both sides of the base material 30a as shown in FIG. 3B can be used.

  Examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 30b include a general acrylic type whose cohesion is improved by heat or ultraviolet rays. In addition, an elastomer-based pressure-sensitive adhesive may be used. In this case, examples of styrene-based materials include SIS (styrene isoprene styrene), SBS (styrene butadiene styrene), and SEBS (styrene ethylene butylene styrene). Other examples include acrylic elastomers, urethane elastomers, and polyolefin elastomers. A general rubber-based pressure-sensitive adhesive can also be used.

  Next, a procedure for manufacturing the product A will be described. First, as shown in FIG. 4, the print layer 40 is formed on the first member 10. Thereafter, as shown in FIG. 5, one adhesive layer 30 b of the double-sided adhesive tape 30 is pressed against the printing layer 40, and the adhesive tape 30 is attached to the first member 10.

  Thereafter, as shown in FIG. 2, the first member 10 and the second member 20 are arranged, and the other adhesive layer 30 b of the adhesive tape 30 is pressed against a predetermined portion of the second member 20. Thereby, the 1st member 10 and the 2nd member 20 are bonded to the adhesive tape 30 instantly and firmly. By using the adhesive tape 30 in this way, unlike the adhesive, no curing time is required, and productivity is increased.

  Examples of the product A include household items, office supplies, home appliances, electronic products, and automobile parts. Examples of the electronic product include a mobile phone, particularly a smartphone, but the product A can be used as long as it can be adhered by the adhesive tape 30.

  Next, a case where the first member 10 of the product A manufactured as described above is separated from the second member 20 will be described. As a reason for separating, for example, when the bonding position of the first member 10 with respect to the second member 20 has shifted, rework for separating the first member 10 from the second member 20 and bonding again, or bonding Examples include so-called repair in which the first member 10 is later damaged and only the first member 10 is replaced, and recycling in which the first member 10 and the second member 20 are separately collected and reused.

  In the above rework, repair, and recycling, breakage or damage of one or both of the first member 10 and the second member 20 must be avoided.

  In the present embodiment, the first member 10 is separated from the second member 20 using the laser light L.

  That is, as shown in FIG. 6, first, a weight W is suspended from the second member 20 to apply a force to the adhesive layer 30 b of the adhesive tape 30 in a direction that separates the first member 10 and the second member 20. Let The magnitude of the force in the separating direction is preferably 0.01 MPa or more, for example.

  In this state, the laser beam L is irradiated from the front side of the first member 10 toward the printing layer 40. The laser light is absorbed by the printing layer 40, and the printing layer 40 generates heat. The heat of the printing layer 40 is transmitted to the adhesive layer 30b of the adhesive tape 30. At this time, since the adhesive layer 30b is adjacent to the print layer 40, the heat of the print layer 40 is quickly transferred to the adhesive layer 30b, and the temperature of the adhesive layer 30b rises quickly.

  As the laser light L to be used, for example, a gas laser, a solid laser, a semiconductor laser, a fiber laser, or the like can be used, and an infrared semiconductor laser with a wavelength of 800 nm to 1500 nm that is easy to handle is particularly preferable.

  The output of the laser beam L and the scanning speed are set so that the first member 10 and the second member 20 are not melted or damaged.

  When the temperature of the pressure-sensitive adhesive layer 30b is increased by irradiation with the laser light L, the pressure-sensitive adhesive layer 30b is softened and the adhesive force is reduced. At this time, since the force is applied in the direction in which the first member 10 and the second member 20 are separated by the weight W, the first member 10 and the second member 10 are peeled in order from the portion where the adhesive layer 30b starts to soften. The member 20 moves away, and the first member 10 is separated from the second member 20 in due time.

  The weight of the weight W can be arbitrarily set, but it is preferable that the magnitude of the force in the direction in which the first member 10 and the second member 20 are separated is 0.01 MPa or more. If this force is smaller than 0.01 MPa, even if the laser beam L is irradiated, the first member 10 is not easily separated from the second member 20, and the irradiation amount of the laser beam L must be increased. In addition, if the force in the direction separating the first member 10 and the second member 20 is too large, the first member 10 and the second member 20 may be damaged. It is preferable to set the weight of the weight W as long as it does not break.

  Further, as a method of applying a force in the direction in which the first member 10 and the second member 20 are separated, in addition to the method using the weight W described above, for example, a method using negative pressure suction, a method using the first member 10 and the first member 10 There is a method of applying a force in the direction of separating the first member 10 from the second member 20 by inserting another member between the two members 20, but it is appropriately selected according to the structure of the product A, etc. Can be used.

  The number of times of irradiation with the laser light L may be one time or a plurality of times. If the output of the laser beam L is low and the same part is irradiated multiple times, the temperature rise of the first member 10 can be moderated, and the temperature of the adhesive layer 30b is gradually increased to increase the adhesive strength. Can be gradually weakened. Thereby, it becomes possible to prevent damage to the first member 10 and the second member 20.

  When one of the first member 10 and the second member 20 is damaged and cannot be reused (repair), the first member 10 is a housing and the second member 20 is an internal component, and the first member 10 is discarded. When the second member 20 is used or for the purpose of separation (recycling), only the adhesive layer 30b is decomposed and easily separated by irradiating the laser beam L with high output once or a plurality of times. It is also possible to make it possible.

  The laser beam L may be irradiated until the temperature at which the adhesive layer 30b is softened or melted, or the laser beam L may be irradiated until the temperature at which the adhesive layer 30b is foamed or decomposed. By disassembling the adhesive layer 30b, the first member 10 can be separated from the second member 20 with an extremely weak force.

  Further, when the base material 30a of the adhesive tape 30 is made of a foam having a closed cell structure, the base material 30a is destroyed by the thermal expansion of the air in the air bubbles. The second member 20 can be separated.

  As described above, since the first member 10 is separated from the second member 20 using the laser light L, it is not necessary to use a solvent, a surfactant, an acid, an alkaline agent, or the like. Furthermore, since the laser beam L can be irradiated selectively only to a portion that needs to be heated (a portion to which the adhesive tape 30 is attached), for example, the influence of heat on heat-sensitive components such as electronic components (liquid crystal substrates, touch panel devices). Can be kept to a minimum.

  Therefore, according to the first embodiment, the first member 10 and the second member 20 are separated by using the laser beam L so that the adhesive layer 30b of the adhesive tape 30 is softened, melted, foamed, or decomposed. Therefore, both members 10, 20, or one of them, or necessary parts and materials can be separated in a reusable form, and rework, repair, and recycling can be performed smoothly.

  In addition, since the laser light non-transmission part is configured by the shielding printing layer 40, the laser light non-transmission part can reliably absorb the laser light L and generate heat, and the adhesive force of the adhesive layer 30b can be ensured. Can be reduced.

  Further, since the laser light L is applied to the pressure-sensitive adhesive layer 30b of the pressure-sensitive adhesive tape 30 in a state in which a force is applied in a direction in which the first member 10 and the second member 20 are separated, a small amount of laser light irradiation. The members can be separated efficiently.

  The second member 20 may be separated from the first member 10.

  Further, the second member 20 may be made of a transparent member, and a printing layer (laser light non-transmitting portion) 40 may be provided on the surface of the second member 20 on the first member 10 side. In this case, the first member 10 can be separated from the second member 20 by irradiating the laser beam L from the second member 20 side to heat the adhesive layer 30 b of the adhesive tape 30.

  The first member 10 and the second member 20 may be electronic components. For example, an electronic component on which an IC or the like is mounted may be the first member 10, a housing that houses the first member 10 may be the second member 20, a liquid crystal display panel may be the first member 10, and the liquid crystal display panel may be The substrate to be attached may be the second member 20.

(Embodiment 2)
The second embodiment is different from the first embodiment in that the first member 10 is made of a colored resin that transmits at least 5% of the laser light L, and the other portions are the same as the first embodiment. Hereinafter, a different part from Embodiment 1 is demonstrated in detail.

  The colored resin constituting the first member 10 can be obtained, for example, by adding a dye or a pigment to the resin. As a result, a laser light non-transmitting portion is formed in the first member 10. Only a part of the first member 10 may be formed of a colored resin, and the other part may be colorless and transparent so-called two-color molding.

  There are various types of resins as the base, and examples thereof include thermoplastic polyethylene, polypropylene, vinyl chloride, polycarbonate, polyacetal, polyethylene terephthalate, and acrylic resin. Moreover, a thermosetting resin may be sufficient and an epoxy resin, a phenol resin, a melanin resin, a guanamine resin etc. are mentioned in this case. Furthermore, an ultraviolet curable resin may be used, and in this case, an unsaturated acrylic resin, a polyester resin, a cationic polymerization epoxy resin, or a monomer thereof can be used.

  The first member 10 of Embodiment 2 is not provided with a printing layer.

  When the first member 10 bonded with the adhesive tape 30 is separated from the second member 20, the laser beam L is irradiated from the front side of the first member 10. The irradiated laser beam L is absorbed by the first member 10 because the first member 10 is colored. The first member 10 that has absorbed the laser light L generates heat, and the heat of the first member 10 is transmitted to the adhesive layer 30b of the adhesive tape 30 so that the adhesive layer 30b is in at least one state among softening, melting, foaming, and decomposition. Thus, the adhesive force by the pressure-sensitive adhesive layer 30b is reduced. As a result, the first member 10 is separated from the second member 20.

  When the transmittance of the laser beam L of the first member 10 is lower than 5%, most of the laser beam L is absorbed by the surface of the first member 10 (irradiated surface of the laser beam L). Since the surface is easily damaged by the laser beam L, it is not preferable.

  On the other hand, when the transmittance of the laser beam L of the first member 10 is 80% or more, the laser beam L is hardly converted into heat and the efficiency is lowered, which is not preferable.

  Therefore, the transmittance of the laser beam L of the first member 10 is preferably in the range of 5% or more and less than 80%. More preferably, it is 10% or more and 70% or less.

  Therefore, according to the second embodiment, as in the first embodiment, the first member 10 and the first member 10 are brought into at least one of softening, melting, foaming, and decomposition using the laser light L. Since the 2nd member 20 can be isolate | separated, both the members 10 and 20 can be isolate | separated in the reusable form, and a rework, repair, and recycling can be performed smoothly.

  The pressure-sensitive adhesive layer 30b of the pressure-sensitive adhesive tape 30 may be laser light non-transmissive. In this case, since the adhesive layer 30b itself absorbs the laser beam L and softens, the first member 10 can be easily separated from the second member 20 even when the first member 10 completely transmits the laser beam.

  Further, when the adhesive tape 30 has a laser light non-transmitting portion, the adhesive layer 30b absorbs the laser light L and generates heat even when the laser light transmittance of the first member 10 is high (for example, 80% or more). Thereby, it is possible to separate the first member 10 and the second member 20 by reducing the adhesive force by bringing the adhesive layer 30b into at least one state among softening, melting, foaming and decomposition.

  The laser light transmittance of the base material 30a of the adhesive tape 30 may be 10% or more. Also in this case, since the adhesive tape 30 has a laser light non-transmitting portion, the first member 10 and the second member 20 can be separated using the laser light L.

  The second member 20 may be the colored resin.

(Embodiment 3)
The third embodiment is different from the first embodiment in that the first member 10 is made of a metal or an oxide thereof, and other parts are the same as the first embodiment. Hereinafter, a different part from Embodiment 1 is demonstrated in detail.

  Examples of the metal constituting the first member 10 include iron, copper, silver, aluminum, magnesium, and alloys thereof. In addition, the first member 10 can be composed of the metal oxide and its alloy.

  When the first member 10 bonded with the adhesive tape 30 is separated from the second member 20, the laser beam L is irradiated from the front side of the first member 10. The irradiated laser light L is reflected to some extent on the surface of the first member 10, but the rest is absorbed by the first member 10. The first member 10 that has absorbed the laser light L generates heat, and the heat of the first member 10 is transmitted to the adhesive layer 30b of the adhesive tape 30 so that the adhesive layer 30b is in at least one state among softening, melting, foaming, and decomposition. Thus, the adhesive force by the pressure-sensitive adhesive layer 30b is reduced. As a result, the first member 10 is separated from the second member 20.

  Therefore, according to the third embodiment, as in the first embodiment, the first member 10 and the adhesive member 30b of the adhesive tape 30 are softened, melted, foamed, and decomposed by using the laser light L. Since the 2nd member 20 can be isolate | separated, both the members 10 and 20 can be isolate | separated in the reusable form, and a rework, repair, and recycling can be performed smoothly.

  In addition, when the 1st member 10 is comprised with the metal with high heat conductivity like silver and aluminum, and its oxide, when the thickness of the 1st member 10 is thick, heat_generation | fever by laser beam L will generate | occur | produce parts other than the adhesive tape 30 In other words, the adhesive layer 30b may not be efficiently heated, so that it is preferable to reduce the thickness in the case of a material having high thermal conductivity.

  Moreover, you may comprise the 2nd member 20 with a metal or its oxide.

  Further, a part of the first member 10 may be made of metal or an oxide thereof, and the other part may be made of resin or glass.

  Examples of the present invention will be described below.

Example 1
The first member 10 was a glass plate, and had a width of 50 mm, a length of 100 mm, and a thickness of 1 mm.

The print layer 40 was formed using a black UV screen ink (manufactured by Jujo Chemical Co., Ltd .: Reicure GA4100). The formation range of the printing layer 40 is the entire circumference of the peripheral portion of the surface of the first member 10 on the second member 20 side, and the width thereof is 2 mm. The printing layer 40 was obtained by irradiating the ink with ultraviolet rays using a metal halide lamp, thereby curing the ink. The amount of ultraviolet irradiation at this time is 300 mJ / mm ² .

  The second member 20 is a transparent plate made of polycarbonate and has a width of 60 mm, a length of 120 mm, and a thickness of 2 mm.

  Moreover, the adhesive tape 30 was made into the double-sided adhesive tape (DIC Corporation make: 8402B). This was punched into a rectangular frame. The outer dimensions are 50 mm in width and 100 mm in length, and the width of the frame portion is 1 mm.

  After peeling off the release film of the pressure-sensitive adhesive tape 30, one pressure-sensitive adhesive layer 30 b of the pressure-sensitive adhesive tape 30 was pressed against the printing layer 40 of the first member 10 to attach the pressure-sensitive adhesive tape 30 to the first member 10.

  Thereafter, the other adhesive layer 30 b of the adhesive tape 30 was pressed against the second member 20, and the first member 10 and the second member 20 were adhered by the adhesive tape 30.

  Next, as shown in FIG. 6, a 500 g weight W is attached to the second member 20, and the first member 10 is affixed to a colorless and transparent fixed glass plate (not shown) using a fixing adhesive tape. It was. The fixing adhesive tape is prevented from overlapping the print layer 40.

  In this state, a force acts on the adhesive layer 30b in a direction in which the first member 10 and the second member 20 are separated, and the magnitude thereof is 0.015 MPa.

  Thereafter, the laser beam L was applied to the printing layer 40 from the surface side of the first member 10. The wavelength of the laser beam L was 940 nm, the output was 10 W, and the focus diameter was 3 mm. The scanning speed was 600 mm / min. The number of times of irradiation with the laser beam L is five.

  The adhesive layer 30b of the adhesive tape 30 was softened by the irradiation with the laser beam L, and the second member 20 was separated from the first member 10 and dropped. At this time, the first member 10 and the second member 20 were not damaged.

(Example 2)
The first member 10 was a 0.5 mm thick copper plate, and the width and length were the same as those of the first member 10 of Example 1.

  The second member 20 is the same as that in the first embodiment.

  The adhesive tape 30 was Y-4914 manufactured by Sumitomo 3M Limited.

  In the same manner as in Example 1, the laser beam L was irradiated with the weight W attached. The output of the laser beam L was 30W. The wavelength, focus diameter, and scanning speed were the same as in Example 1. The number of irradiations was one.

  The adhesive layer 30b of the adhesive tape 30 was softened by one irradiation of the laser beam L, and the second member 20 was separated from the first member 10 and dropped. At this time, the first member 10 and the second member 20 were not damaged.

(Example 3)
The first member 10 was a polycarbonate plate colored blue. Each dimension is the same as the first member 10 of the first embodiment. The laser light transmittance of the first member 10 was 10% at a wavelength of 940 nm.

  The second member 20 was the same as in Example 1.

  The adhesive tape 30 was 5000-NS manufactured by Nitto Denko Corporation.

  In the same manner as in Example 1, the laser beam L was irradiated with the weight W attached. The output of the laser beam L was 10W. The wavelength, focus diameter, and scanning speed were the same as in Example 1.

  The second member 20 was separated from the first member 10 and dropped by the eighth laser beam L irradiation. At this time, the first member 10 and the second member 20 were not damaged.

Example 4
The second member 20 is the same as that in the first embodiment.

  The adhesive tape 30 was 5230NSB manufactured by Sekisui Chemical Co., Ltd.

  In the same manner as in Example 1, the laser beam L was irradiated with the weight W attached. The output of the laser beam L was 20W. The wavelength, focus diameter, and scanning speed of the laser beam L were the same as in Example 1.

  The second member 20 was separated from the first member 10 and dropped by the 15th laser beam L irradiation. At this time, the first member 10 and the second member 20 were not damaged.

  As described above, the method for separating a member using laser light according to the present invention can be widely applied to the case of separating a strongly bonded member using an adhesive tape.

A Product 10 First member 20 Second member 30 Adhesive tape 30a Base material 30b Adhesive layer 40 Print layer (laser light non-transmitting portion)
L Laser light

Claims (5)

In a separation method for separating a transparent first member and an opaque second member bonded by an adhesive tape,
Above the peripheral edge portion of the surface of the second member side of the first member, printed layer or metal deposition film is laser light non-transmissive portion are formed, the adhesive tape adjacent to the laser beam non-transmitting portion The pressure-sensitive adhesive layer is disposed, and the laser light non-transparent portion is irradiated with laser light from the side opposite to the second member in the first member to generate heat, and this heat softens the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape. Separating the first member and the second member by reducing the adhesive force of the adhesive layer in at least one of melting, foaming and decomposition states, and separating the member using laser light . In the separation method of the member using the laser beam according to claim 1,
The method for separating members using laser light, wherein the laser light non-transmitting portion is made of a colored resin that transmits at least 5% of the laser light. In the separation method of the member using the laser beam according to claim 1,
The method for separating members using laser light, wherein the laser light non-transmitting portion is made of metal or metal oxide . In the separation method of the member using the laser beam according to any one of claims 1 to 3 ,
A laser beam, wherein a force is applied to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape in a direction in which the first member and the second member are separated from each other, and the laser beam non-transparent portion is irradiated with the laser beam in this state. Method of separating members using In the separation method of the member using the laser beam as described in any one of Claim 1 to 4,
A method for separating members using laser light, wherein the same part is irradiated with laser light twice or more .

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