JP2007146011A - Tape, sealing tape and envelope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize a base material peeled off adhesive layer as an adhesive tape without being disposed of. <P>SOLUTION: A tape 1 comprising a first adhesive layer 1a and a base material 1b for covering the first adhesive layer 1a is provided. In this tape 1, a second adhesive layer 1c is interposed in between the first adhesive layer 1a and the base material 1b, and the tackiness of the interface between the base material 1b and the second adhesive layer 1c is made larger than that of the interface between the first adhesive layer 1a and the second adhesive layer 1c so as to leave the second adhesive layer 1c on the base material 1b side when the base material 1b is peeled off the first adhesive layer 1a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tape comprising an adhesive layer and a substrate for covering the adhesive layer, and in particular, can be used as an adhesive tape without discarding the substrate peeled off from the adhesive layer. Regarding tape.

  Furthermore, the present invention relates to a sealing tape comprising an adhesive layer for joining the flap portion of the envelope and the main body portion of the envelope, and a base material for covering the adhesive layer, and an envelope to which the tape is attached. In particular, the present invention relates to a sealing tape that can be used as an adhesive tape without discarding a substrate peeled off from an adhesive layer, and an envelope on which the tape is attached.

  Conventionally, an adhesive layer (adhesive layer) for joining the sealing piece (flap part) of the envelope and the main body part of the envelope, and a release paper (base material) for covering the adhesive layer (adhesive layer) There is known a double-sided tape for sealing (sealing tape) comprising: An example of this type of double-sided tape for sealing (sealing tape) is described in, for example, Japanese Patent Laid-Open No. 2000-25780.

  FIG. 1 of Japanese Patent Application Laid-Open No. 2000-25780 describes an example in which a double-sided sealing tape (sealing tape) is attached to a portion covered by a sealing piece (flap portion) of the envelope among the main body portion of the envelope. In FIG. 2 of Japanese Patent Laid-Open No. 2000-25780, there is described an example in which a double-sided sealing tape (sealing tape) is attached to a sealing piece (flap portion) of an envelope.

  Japanese Patent Laid-Open No. 2000-25780 describes that the double-sided tape for sealing (sealing tape) may be wound into a roll or a sheet before being attached to the envelope. Has been.

  When the envelope is sealed with the double-sided sealing tape (sealing tape) described in JP-A-2000-25780, the release paper (base material) is peeled off from the pressure-sensitive adhesive layer (pressure-sensitive adhesive layer), and the pressure-sensitive adhesive layer ( The sealing piece (flap portion) of the envelope and the main body portion of the envelope are joined by the adhesive layer.

  However, when the envelope is sealed with the double-sided sealing tape (sealing tape) described in JP-A-2000-25780, as described above, the sealing piece (flap portion) of the envelope by the adhesive layer (adhesive layer) ) And the main part of the envelope, but the release paper (base material) peeled off from the pressure-sensitive adhesive layer (adhesion layer) becomes garbage, and there is a need to discard the release paper (base material) It will occur. In particular, when sealing with a double-sided sealing tape (sealing tape) described in Japanese Patent Application Laid-Open No. 2000-25780 is performed at the destination, there is a need to bring back release paper (base material) that has become trash. End up.

  In addition, when the envelope is sealed with a double-sided sealing tape (sealing tape) described in JP-A-2000-25780, the double-sided sealing tape (sealing) described in JP-A-2000-25780 If the user feels that the sealing piece (flap portion) of the envelope may be opened by sealing only with the adhesive layer (adhesive layer) of the tape for sealing), the sealing described in JP-A-2000-25780 In addition to double-sided adhesive tape (sealing tape), an adhesive tape is prepared separately, and the adhesive tape is attached on the outer surface of the envelope sealing piece (flap part) and the envelope body part. It becomes necessary to apply a tape.

JP 2000-25780 A

  In view of the above problems, an object of the present invention is to provide a tape that can be used as an adhesive tape without discarding a base material peeled from an adhesive layer.

  Furthermore, an object of this invention is to provide the sealing tape which can be utilized as an adhesive tape, without discarding the base material peeled from the adhesion layer, and the envelope on which it was affixed.

  According to invention of Claim 1, in the tape which comprises a 1st adhesion layer and a base material for covering the 1st adhesion layer, it is the 2nd between the 1st adhesion layer and the substrate. An adhesive layer is disposed, and when the base material is peeled off from the first adhesive layer, the interface between the base material and the second adhesive layer is left so that the second adhesive layer remains on the base material side. There is provided a tape characterized in that the adhesive force is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer.

  According to invention of Claim 2, the sealing tape which comprises the 1st adhesion layer for joining the flap part of an envelope, and the main-body part of an envelope, and the base material for covering the said 1st adhesion layer. The second adhesive layer is disposed between the first adhesive layer and the base material, and the second adhesive layer is disposed on the base material side when the base material is peeled off from the first adhesive layer. A sealing tape characterized in that the adhesive force at the interface between the base material and the second adhesive layer is larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer so as to remain. Provided.

  According to the invention described in claim 3, the first adhesive layer is constituted by a double-sided tape having a three-layer structure in which the third adhesive layer and the fourth adhesive layer are laminated on both surfaces of the support, and is brought into contact with the envelope. By making the adhesive force of the third adhesive layer to be greater than the adhesive force of the fourth adhesive layer brought into contact with the second adhesive layer, the adhesive force of the interface between the first adhesive layer and the envelope is 3. The sealing tape according to claim 2, wherein the sealing tape is larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer.

  According to the invention described in claim 4, a molecular weight gradient is formed in the first adhesive layer, and the adhesive force of the surface of the first adhesive layer that is brought into contact with the envelope is brought into contact with the second adhesive layer. The adhesive force at the interface between the first adhesive layer and the envelope is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer by making it larger than the adhesive force of the caulking surface. The sealing tape according to claim 2 is provided.

  According to invention of Claim 5, the said 1st adhesion layer is comprised by the 2 layer structure which consists of a 5th adhesion layer and a 6th adhesion layer, and the adhesive force of the said 5th adhesion layer made to contact an envelope, By making it larger than the adhesive force of the sixth adhesive layer brought into contact with the second adhesive layer, the adhesive force at the interface between the first adhesive layer and the envelope is increased with the first adhesive layer and the second adhesive layer. The sealing tape according to claim 2, wherein the sealing tape is larger than the adhesive strength of the interface.

  According to invention of Claim 6, the envelope by which the tape for sealing as described in any one of Claims 2-5 was affixed is provided.

  In the tape of Claim 1, when the 2nd adhesion layer is arrange | positioned between the 1st adhesion layer and the base material for covering the 1st adhesion layer, and the base material was peeled from the 1st adhesion layer, The adhesive force at the interface between the substrate and the second adhesive layer is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer so that the second adhesive layer remains on the substrate side.

  That is, in the tape according to claim 1, when the base material is peeled off from the first adhesive layer, the second adhesive layer is left on the base material.

  Therefore, according to the tape of Claim 1, the base material peeled from the 1st adhesion layer can be utilized as an adhesive tape, without discarding conventionally.

  In the sealing tape according to claim 2, the second adhesive is provided between the first adhesive layer for joining the flap portion of the envelope and the main body portion of the envelope and the base material for covering the first adhesive layer. The adhesive force at the interface between the substrate and the second adhesive layer is such that the second adhesive layer remains on the substrate side when the layer is disposed and the substrate is peeled from the first adhesive layer. The adhesive strength of the interface between the layer and the second adhesive layer is made larger.

  That is, in the sealing tape according to claim 2, when the base material is peeled off from the first adhesive layer, the second adhesive layer is left on the base material.

  Therefore, according to the sealing tape according to claim 2, the base material peeled off from the first adhesive layer can be used as an adhesive tape without being discarded as in the prior art.

  In the sealing tape according to claim 2, preferably, the base material peeled off from the first adhesive layer is stuck on the outer surface of the envelope so as to straddle the flap portion of the envelope and the main body portion of the envelope. . In other words, the flap portion of the envelope and the main body portion of the envelope are joined by the base material peeled from the first adhesive layer. Therefore, reliable sealing can be performed as compared with the case where the flap portion of the envelope and the main body portion of the envelope are joined only by the first adhesive layer.

  Furthermore, in the sealing tape according to claim 2, preferably, the base material and the second adhesive layer are subjected to a corona discharge treatment before the base material and the second adhesive layer are laminated. The adhesive force at the interface is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer.

  Alternatively, in the sealing tape according to claim 2, preferably, the base material and the second adhesive layer are coated with a primer before the base material and the second adhesive layer are laminated. The adhesive force at the interface is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer.

  Furthermore, in the sealing tape according to claim 2, preferably, one of the first adhesive layer and the second adhesive layer is formed by an adhesive composition containing a resin component mainly composed of polyester having a polycarbonate structure. By forming the other of the first adhesive layer and the second adhesive layer with an adhesive composition other than the adhesive composition, the adhesive force at the interface between the first adhesive layer and the second adhesive layer is It is made smaller than the adhesive force of the interface of a base material and a 2nd adhesion layer.

  In the sealing tape according to claim 2, preferably, the adhesive force at the interface between the first adhesive layer and the envelope is larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer. . In other words, the adhesive force at the interface between the first adhesive layer and the second adhesive layer is made smaller than the adhesive force at the interface between the first adhesive layer and the envelope, and the adhesive force at the interface between the substrate and the second adhesive layer. Have been smaller. Therefore, it can be avoided that the first adhesive layer is peeled off from the envelope when the substrate is peeled off from the sealing tape attached to the envelope.

  Specifically, in the sealing tape according to claim 2, a tackifier is preferably added to the first adhesive layer.

  Or in the sealing tape of Claim 2, Preferably, the crosslinking agent is added to the 1st adhesion layer.

  In the sealing tape according to claim 2, preferably, a filler is added to the first adhesive layer.

  In the sealing tape according to claim 3, the first adhesive layer is constituted by a double-sided tape having a three-layer structure in which the third adhesive layer and the fourth adhesive layer are laminated on both surfaces of the support, and is brought into contact with the envelope. By making the adhesive force of the third adhesive layer larger than the adhesive force of the fourth adhesive layer brought into contact with the second adhesive layer, the adhesive force at the interface between the first adhesive layer and the envelope is increased. It is made larger than the adhesive force of the interface with 2 adhesion layers. Therefore, the adhesive force at the interface between the first adhesive layer and the envelope is more easily determined than the case where the first adhesive layer is constituted by a single layer. Can be larger.

  The sealing tape according to claim 4, wherein a molecular weight gradient is formed in the first adhesive layer, and the adhesive force of the surface of the first adhesive layer that is brought into contact with the envelope is brought into contact with the second adhesive layer. By making it larger than the adhesive force, the adhesive force at the interface between the first adhesive layer and the envelope is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer. Therefore, the adhesive force at the interface between the first adhesive layer and the envelope can be made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer without the need for the first adhesive layer to have a multi-layer structure.

  In the sealing tape according to claim 5, the first adhesive layer is configured by a two-layer structure including the fifth adhesive layer and the sixth adhesive layer, and the adhesive force of the fifth adhesive layer brought into contact with the envelope is the second By making it larger than the adhesive force of the sixth adhesive layer brought into contact with the adhesive layer, the adhesive force at the interface between the first adhesive layer and the envelope is larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer. Has been. Therefore, the adhesive force at the interface between the first adhesive layer and the envelope is more easily determined than the case where the first adhesive layer is constituted by a single layer. Can be larger.

  According to the envelope of the sixth aspect, the base material peeled off from the first adhesive layer can be used as an adhesive tape without being discarded as in the prior art.

  Hereinafter, a first embodiment of the tape of the present invention will be described. The tape of 1st Embodiment is used in order to seal an envelope, for example. FIG. 1 is a view showing a tape 1 according to the first embodiment. Specifically, FIG. 1A is a perspective view of the tape 1 of the first embodiment, and FIG. 1B is a cross-sectional view of the tape 1 of the first embodiment. In FIG. 1, the cross-sectional dimension (vertical dimension in FIG. 1) of the tape 1 is exaggerated compared to the length dimension (horizontal dimension in FIG. 1) and the width dimension (depth dimension in FIG. 1). It is shown.

  As shown in FIG. 1, the tape 1 of 1st Embodiment is comprised by the 1st adhesion layer 1a, the base material 1b, and the 2nd adhesion layer 1c arrange | positioned among them. Furthermore, in the tape 1 of the first embodiment, the adhesive force at the interface between the base material 1b and the second adhesive layer 1c is made larger than the adhesive force at the interface between the first adhesive layer 1a and the second adhesive layer 1c. ing. In other words, the force required to peel the substrate 1b and the second adhesive layer 1c is made larger than the force required to peel the first adhesive layer 1a and the second adhesive layer 1c.

  FIG. 2 is a view for explaining a method of sealing the envelope 2 with the tape 1 according to the first embodiment. In the sealing method of the envelope 2 with the tape 1 of the first embodiment, first, as shown in FIGS. 1 and 2A, the flap portion 2a of the main body portion 2b of the envelope 2 is folded and overlapped. The tape 1 is affixed at the position to be applied. Specifically, the base material 1 b and the second adhesive layer 1 c of the tape 1 are attached to the main body portion 2 b of the envelope 2 by the first adhesive layer 1 a of the tape 1.

  Next, as shown in FIGS. 1 and 2B, the base material 1b of the tape 1 is peeled off. Specifically, as described above, in the tape 1 of the first embodiment, the adhesive force at the interface between the base material 1b and the second adhesive layer 1c is the interface between the first adhesive layer 1a and the second adhesive layer 1c. The adhesive strength at the interface between the envelope 2 and the first adhesive layer 1a is greater than the adhesive strength at the interface between the first adhesive layer 1a and the second adhesive layer 1c. Therefore, when the base material 1b of the tape 1 is peeled off, the second adhesive layer 1c is left not on the first adhesive layer 1a side but on the base material 1b side. Also, the first adhesive layer 1a is left on the envelope 2 side, not on the second adhesive layer 1c side. That is, when the base material 1b of the tape 1 is peeled, at the interface between the first adhesive layer 1a and the second adhesive layer 1c, the base material 1b and the second adhesive layer 1c, the first adhesive layer 1a and the envelope 2 It is divided into.

  Next, as shown in FIGS. 1 and 2C, the flap portion 2a of the envelope 2 is folded, and the flap portion 2a and the main body portion 2b are joined by the adhesive force of the first adhesive layer 1a. Thereby, the envelope 2 is sealed.

  Furthermore, in the tape 1 of the first embodiment, the peeled substrate 1b and the second adhesive layer 1c attached to the substrate 1b are used for further sealing of the envelope 2. Specifically, as shown in FIG. 1 and FIG. 2 (D), the base material 1b of the tape 1 is stretched over the flap portion 2a and the main body portion 2b of the envelope 2 by the second adhesive layer 1c. Pasted on the outer surface of the. Thereby, the envelope 2 is sealed twice.

  As described above, in the sealing method of the envelope 2 with the tape 1 of the first embodiment, not only the flap portion 2a and the main body portion 2b of the envelope 2 are joined by the first adhesive layer 1a of the tape 1, but also the tape The flap portion 2a and the main body portion 2b of the envelope 2 are joined by the one base material 1b and the second adhesive layer 1c. Therefore, according to the sealing method of the envelope 2 with the tape 1 of the first embodiment, the flap portion 2a and the main body portion 2b of the envelope 2 are joined more securely than the first adhesive layer 1a of the tape 1 alone. Can be sealed.

  Therefore, even when the tape 1 of the first embodiment is used for a thick envelope such as an envelope with a cushion function, the tape 1 can be surely sealed.

  Further, by using the tape 1 of the first embodiment, it is possible to eliminate the necessity of separately preparing an adhesive tape for attaching to the outer surface of the flap portion 2a and the main body portion 2b of the envelope 2.

  Furthermore, in the sealing method of the envelope 2 with the tape 1 of the first embodiment, the peeled base material 1b is caused by the second adhesive layer 1c left on the base material 1b side, and the flap portion 2a of the envelope 2 And since it affixes on the outer surface of the main-body part 2b, it can avoid becoming the garbage, without utilizing the base material 1b peeled off.

  Specifically, in the tape 1 of the first embodiment, as described above, the adhesive force at the interface between the base material 1b of the tape 1 and the second adhesive layer 1c is set to the first adhesive layer 1a and the second adhesive layer. In order to make it larger than the adhesive force at the interface with 1c, a corona discharge treatment is applied to the film that becomes the substrate 1b before the substrate 1b and the second adhesive layer 1c are laminated.

  Moreover, in the tape 1 of 1st Embodiment, as above-mentioned, the adhesive force of the interface of the 1st adhesion layer 1a of the tape 1 and the 2nd adhesion layer 1c is made into the base material 1b and the 2nd adhesion layer 1c. In order to make it smaller than the adhesive strength of the interface and the adhesive strength of the interface between the envelope 2 and the first adhesive layer 1a, the adhesive composition containing a resin component mainly composed of polyester having a polycarbonate structure part is used as the first. One of the adhesive layer 1a and the second adhesive layer 1c is constituted, and the other of the first adhesive layer 1a and the second adhesive layer 1c is constituted by an adhesive composition other than the adhesive composition.

  Furthermore, in the tape 1 of the first embodiment, as described above, the adhesive force at the interface between the envelope 2 and the first adhesive layer 1a of the tape 1 is reduced to the interface between the first adhesive layer 1a and the second adhesive layer 1c. In order to make it larger than the adhesive strength of the first adhesive layer 1a, for example, it is easy to adhere to paper such as the envelope 2 and is adhered to the second adhesive layer 1c so that it can be peeled (between the adhesive layers). It is selected as an adhesive.

  The tape 1 of the first embodiment is configured in a sheet shape as shown in FIG. 1, but in the tape 1 of the second embodiment, the tape 1 as shown in FIG. It is also possible to wind it around. In the tape 1 of the second embodiment, in order to easily feed the tape 1 as shown in FIG. 1 from a tape reel (not shown) wound in a roll shape, the base of the tape 1 is used. The material of the base material 1b is selected so that the adhesive force at the interface between the upper surface of the material 1b and the lower surface of the first adhesive layer 1a is relatively small.

  Alternatively, in the tape 1 of the third embodiment, instead, the tape 1 as shown in FIG. 1 can be easily fed out from a tape reel (not shown) wound in a roll shape. It is also possible to perform a peeling process on the upper surface of the substrate 1b of the tape 1.

  Hereinafter, the fourth embodiment of the tape of the present invention will be described. The tape of 4th Embodiment is comprised similarly to the tape 1 of 1st Embodiment mentioned above except the point mentioned later. Therefore, according to the tape of the fourth embodiment, substantially the same effects as those of the tape 1 of the first embodiment described above can be obtained except for the points described later.

  In the tape 1 of the first embodiment, as described above, the base material 1b is subjected to a corona discharge treatment before the base material 1b and the second adhesive layer 1c of the tape 1 are laminated. The adhesive force at the interface with the second adhesive layer 1c is made larger than the adhesive force at the interface between the first adhesive layer 1a and the second adhesive layer 1c, but the tape 1 of the fourth embodiment (see FIG. 1). Instead, by applying a primer (not shown) to the substrate 1b before the substrate 1b and the second adhesive layer 1c are laminated, the interface between the substrate 1b and the second adhesive layer 1c is applied. Is greater than the adhesive force at the interface between the first adhesive layer 1a and the second adhesive layer 1c.

  Hereinafter, fifth to seventh embodiments of the tape of the present invention will be described. The tapes of the fifth to seventh embodiments are configured in the same manner as the tape 1 of the first embodiment described above, except for the points described below. Therefore, according to the tapes of the fifth to seventh embodiments, substantially the same effects as those of the tape 1 of the first embodiment described above can be obtained except for the points described below.

  In the tape 1 of the first embodiment, as described above, for example, the tape 1 that is easy to adhere to paper such as the envelope 2 and that adheres to the second pressure-sensitive adhesive layer 1c (to the pressure-sensitive adhesive layers) so that it can be peeled off, By selecting the adhesive of the first adhesive layer 1a, the adhesive force at the interface between the first adhesive layer 1a and the envelope 2 is made larger than the adhesive force at the interface between the first adhesive layer 1a and the second adhesive layer 1c. However, in the tape 1 of the fifth embodiment (see FIG. 1), instead, an adhesive at the interface between the first adhesive layer 1a and the envelope 2 is added by adding a tackifier to the first adhesive layer 1a. The force is set larger than the adhesive force at the interface between the first adhesive layer 1a and the second adhesive layer 1c.

  Moreover, in the tape 1 of 6th Embodiment (refer FIG. 1), the adhesive force of the interface of the 1st adhesion layer 1a and the envelope 2 is added by adding a crosslinking agent to the 1st adhesion layer 1a instead. It is made larger than the adhesive force of the interface of the 1st adhesion layer 1a and the 2nd adhesion layer 1c.

  Furthermore, in the tape 1 of the seventh embodiment (see FIG. 1), instead of adding a filler to the first adhesive layer 1a, the adhesive force at the interface between the first adhesive layer 1a and the envelope 2 is increased. The adhesive strength at the interface between the first adhesive layer 1a and the second adhesive layer 1c is made larger.

  Hereinafter, an eighth embodiment of the tape of the present invention will be described. The tape of the eighth embodiment is configured in the same manner as the tape 1 of the first embodiment described above except for the points described below. Therefore, according to the tape of the eighth embodiment, substantially the same effects as those of the tape 1 of the first embodiment described above can be obtained except for the points described later.

  FIG. 3 is a cross-sectional view of the tape 1 ′ of the eighth embodiment. 3, the same reference numbers as those shown in FIGS. 1 and 2 indicate the same parts or portions as the parts or portions shown in FIGS. In the tape 1 of the first embodiment, as shown in FIG. 1, the first adhesive layer 1 a of the tape 1 is constituted by a single layer. Instead, in the tape 1 ′ of the eighth embodiment, As shown in FIG. 3, the first adhesive layer 1a ′ of the tape 1 ′ has a three-layer structure in which the support 1a1 is composed of a third adhesive layer 1a2 and a fourth adhesive layer 1a3 laminated on both sides thereof. Consists of tape.

  The ninth embodiment of the tape of the present invention will be described below. The tape of the ninth embodiment is configured in the same manner as the tape 1 of the first embodiment described above except for the points described below. Therefore, according to the tape of the ninth embodiment, substantially the same effects as those of the tape 1 of the first embodiment described above can be obtained except for the points described below.

  FIG. 4 is a cross-sectional view of the tape 1 ″ according to the ninth embodiment. In FIG. 4, the same reference numerals as those shown in FIGS. 1 to 3 denote the parts or parts shown in FIGS. In the tape 1 of the first embodiment, the first adhesive layer 1a of the tape 1 is constituted by a single layer as shown in FIG. In the tape 1 ″ of the ninth embodiment, as shown in FIG. 4, the first adhesive layer 1a ″ of the tape 1 ″ includes the support 1a1, the third adhesive layer 1a2 ′ laminated on both surfaces, and the first adhesive layer 1a2 ′. It is comprised by the double-sided tape of the 3 layer structure which consists of 4 adhesion layers 1a3 '.

  Furthermore, in the tape 1 ″ of the ninth embodiment, the adhesive force of the third adhesive layer 1a2 ′ brought into contact with the envelope 2 is larger than the adhesive force of the fourth adhesive layer 1a3 ′ brought into contact with the second adhesive layer 1c. Thus, the adhesive force at the interface between the first adhesive layer 1a ″ and the envelope 2 is made larger than the adhesive force at the interface between the first adhesive layer 1a ″ and the second adhesive layer 1c.

  The tenth embodiment of the tape of the present invention will be described below. The tape of 10th Embodiment is comprised similarly to the tape 1 of 1st Embodiment mentioned above except the point mentioned later. Therefore, according to the tape of the tenth embodiment, substantially the same effects as those of the tape 1 of the first embodiment described above can be obtained except for the points described below.

  FIG. 5 is a cross-sectional view of the tape 11 of the tenth embodiment. 5, the same reference numerals as those shown in FIGS. 1 to 4 indicate the same parts or portions as the parts or parts shown in FIGS. In the tape 1 of the first embodiment, as shown in FIG. 1, the first adhesive layer 1a of the tape 1 is constituted by a single layer, and no molecular weight gradient is formed in the first adhesive layer 1a. Instead, in the tape 11 of the tenth embodiment, as shown in FIG. 5, the first adhesive layer 11a of the tape 11 is constituted by a single layer, and a molecular weight gradient is formed in the first adhesive layer 11a. Has been.

  Specifically, in the tape 11 of the tenth embodiment, the adhesive force of the surface (the lower surface in FIG. 5) of the first adhesive layer 11a that is brought into contact with the envelope 2 is in contact with the second adhesive layer 1c. By making it larger than the adhesive force of the caulking surface (upper surface in FIG. 5), the adhesive force at the interface between the first adhesive layer 11a and the envelope 2 is the interface between the first adhesive layer 11a and the second adhesive layer 1c. A molecular weight gradient is formed in the first adhesive layer 11a so as to be larger than the adhesive strength of the first adhesive layer 11a.

  Hereinafter, an eleventh embodiment of the tape of the present invention will be described. The tape of the eleventh embodiment is configured in the same manner as the tape 1 of the first embodiment described above except for the points described below. Therefore, according to the tape of the eleventh embodiment, substantially the same effects as those of the tape 1 of the first embodiment described above can be obtained except for the points described below.

  FIG. 6 is a cross-sectional view of the tape 21 of the eleventh embodiment. In FIG. 6, the same reference numerals as those shown in FIGS. 1 to 5 indicate the same parts or portions as the parts or parts shown in FIGS. In the tape 1 of the first embodiment, as shown in FIG. 1, the first adhesive layer 1 a of the tape 1 is configured by a single layer. Instead, in the tape 21 of the eleventh embodiment, As shown in FIG. 6, the 1st adhesion layer 21a of the tape 21 is comprised by the 2 layer structure which consists of the 5th adhesion layer 21a1 and the 6th adhesion layer 21a2.

  Specifically, in the tape 21 of the eleventh embodiment, the adhesive force of the fifth adhesive layer 21a1 brought into contact with the envelope 2 is made larger than the adhesive force of the sixth adhesive layer 21a2 brought into contact with the second adhesive layer 1c. As a result, the first adhesive layer 21a has the first adhesive layer 21a so that the adhesive force at the interface between the first adhesive layer 21a and the envelope 2 is greater than the adhesive force at the interface between the first adhesive layer 21a and the second adhesive layer 1c. It is constituted by a two-layer structure including a fifth adhesive layer 21a1 and a sixth adhesive layer 21a2.

  In the twelfth embodiment, the above-described first to eleventh embodiments can be appropriately combined.

  In the first to twelfth embodiments, as described above, the tape is used to seal the envelope. However, in the modifications of the first to twelfth embodiments, the first to twelfth embodiments are used. It is also possible to use a tape having the same configuration as that of the tape for another use.

It is the figure which showed the tape 1 of 1st Embodiment. It is a figure for demonstrating the sealing method of the envelope 2 with the tape 1 of 1st Embodiment. It is sectional drawing of the tape 1 'of 8th Embodiment. It is sectional drawing of the tape 1 "of 9th Embodiment. It is sectional drawing of the tape 11 of 10th Embodiment. It is sectional drawing of the tape 21 of 11th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tape 1a 1st adhesion layer 1b Base material 1c 2nd adhesion layer 2 Envelope 2a Flap part 2b Main-body part

Claims (6)

  In a tape comprising a first adhesive layer and a base material for covering the first adhesive layer, a second adhesive layer is disposed between the first adhesive layer and the base material, and the base material is The adhesive force at the interface between the substrate and the second adhesive layer is set so that the second adhesive layer remains on the substrate side when peeled from the first adhesive layer. A tape characterized by having a greater adhesive force at the interface with the second adhesive layer.   In the sealing tape which comprises the 1st adhesion layer for joining the flap part of an envelope, and the main-body part of an envelope, and the base material for covering the 1st adhesion layer, the 1st adhesion layer and the base material The second adhesive layer is disposed between the base material and the second adhesive layer so that the second adhesive layer remains on the side of the base material when the base material is peeled off from the first adhesive layer. A sealing tape, wherein the adhesive force at the interface with the adhesive layer is greater than the adhesive force at the interface between the first adhesive layer and the second adhesive layer.   The first adhesive layer is constituted by a double-sided tape having a three-layer structure in which a third adhesive layer and a fourth adhesive layer are laminated on both sides of the support, and the adhesive force of the third adhesive layer brought into contact with the envelope is By making it larger than the adhesive force of the fourth adhesive layer brought into contact with the second adhesive layer, the adhesive force at the interface between the first adhesive layer and the envelope is increased with the first adhesive layer and the second adhesive layer. The sealing tape according to claim 2, wherein the sealing tape is larger than the adhesive strength of the interface.   By forming a molecular weight gradient in the first adhesive layer, and making the adhesive force of the surface of the first adhesive layer contacted with the envelope larger than the adhesive force of the surface contacted with the second adhesive layer The sealing tape according to claim 2, wherein the adhesive force at the interface between the first adhesive layer and the envelope is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer. .   The first adhesive layer is constituted by a two-layer structure including a fifth adhesive layer and a sixth adhesive layer, and the adhesive force of the fifth adhesive layer brought into contact with an envelope is made to be in contact with the second adhesive layer. The adhesive force at the interface between the first adhesive layer and the envelope is made larger than the adhesive force at the interface between the first adhesive layer and the second adhesive layer by making it larger than the adhesive force of the six adhesive layers. The sealing tape according to claim 2.   An envelope to which the sealing tape according to any one of claims 2 to 5 is attached.

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