JP2017065788A - Belt member and belt member manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt member which can be removed in a plastic bottle recycling process.
SOLUTION: A belt member 10 that is attached to a thermoplastic plastic bottle 50 and includes a belt-like base material is formed within a predetermined range from both ends of the belt member 10, and an adhesive having thermal alkali peelability is formed on the surface. It has a pair of apply | coated adhesive parts 20 and the holding part 30 between which a adhesive agent is not apply | coated to the surface between a pair of adhesive parts.
[Selection] Figure 1

Description

  The present invention relates to a belt member attached to a plastic bottle filled with a liquid and a belt member manufacturing method.

  As containers for filling liquids, plastic bottles of various capacities are used for various purposes. For example, in recent years, many water servers are installed in homes and stores, and large-capacity plastic bottles are used as containers for supplying water to these water servers.

  As the capacity of the plastic bottle increases, the weight of the plastic bottle filled with the liquid increases, making it difficult to carry and load. In consideration of such problems, for example, Patent Document 1 proposes that a flexible belt-like lifting tool is attached to a water server bottle with an adhesive so as to straddle the bottom of the bottle.

JP 2012-46216 A

  When the plastic bottle is made of a recyclable material, it is preferable to recycle the plastic bottle by removing the hanger from the plastic bottle after use. However, the conventional hanging tool is not configured to be easily removed from the plastic bottle in the recycling process, and thus it is difficult to reuse the plastic bottle.

  Therefore, the present invention has been made in view of these points, and an object thereof is to provide a belt member that can be removed in a plastic bottle recycling process and a method for manufacturing the belt member.

  In the first aspect of the present invention, the belt member is attached to a plastic bottle having thermoplasticity and includes a belt-like base material, and is formed in a predetermined range from both ends of the belt member, and has a thermal alkali peeling suitability. There is provided a belt member having a pair of adhesive portions applied to the surface thereof and a grip portion between the pair of adhesive portions, the adhesive portion not applied to the surface.

  In the adhesive portion, the adhesive may be applied in a dispersed manner in a plurality of regions.

  In the adhesive portion, a plurality of holes penetrating from the first surface mounted on the plastic bottle to the second surface located on the opposite side of the first surface of the surface of the belt-shaped base material are formed. Also good. In this case, the plurality of holes may be formed in a broken line shape along the longitudinal direction of the band-shaped substrate. The plurality of holes may be formed in a lattice shape.

  In the grip portion, the adhesive may not be applied to the belt-like base material. Or in the said holding part, the said adhesive agent apply | coated to the said strip | belt-shaped base material may be covered with the coating | covering material.

  In the second aspect of the present invention, there is provided a method for producing a belt member to be attached to a plastic bottle having thermoplasticity, a preparation step for preparing a belt-like substrate, and a predetermined range from both ends of the belt-like substrate. And a coating step of applying an adhesive having hot alkali peelability inside.

  According to a third aspect of the present invention, there is provided a method for producing a belt member to be attached to a plastic bottle having thermoplasticity, comprising a preparation step of preparing a strip-shaped substrate, and the suitability of thermal alkali peeling for the strip-shaped substrate. There is provided a method for manufacturing a belt member, comprising: an application step of applying an adhesive having: and a step of covering a part of the adhesive applied to the belt-shaped substrate with a covering material.

  In the preparatory step of the second aspect and the third aspect of the present invention, a long belt-like base material is prepared, and the belt member manufacturing method includes the long-shaped belt coated with the adhesive. You may further have the cutting process which cut | disconnects a strip | belt-shaped base material to predetermined length. In this case, in the application step, after the adhesive is applied to the elongated strip-shaped substrate, the strip-shaped substrate is wound into a roll to create a wound body, and in the cutting step, The long strip-shaped base material coated with the adhesive may be unwound from the wound body, and the unrolled strip-shaped base material may be cut into a predetermined length.

  According to the present invention, the adhesive applied to the adhesive portion of the belt-like base material of the belt member has a hot alkali peelability. For this reason, when processing a plastic bottle using alkaline aqueous solution in a recycling process, a belt member can be removed from a plastic bottle. Therefore, the recyclability of the plastic bottle can be improved.

It is a perspective view showing the state where the belt member concerning a 1st embodiment was attached to the plastic bottle. It is a top view which shows the case where the belt member which concerns on 1st Embodiment is seen from the 1st surface side of a strip | belt-shaped base material. It is a longitudinal cross-sectional view which shows the case where the belt member which concerns on 1st Embodiment is cut | disconnected along the longitudinal direction. It is a top view which shows 1 process of the manufacturing method of the belt member which concerns on 1st Embodiment. It is a top view which shows the case where the belt member which concerns on 2nd Embodiment is seen from the 1st surface side of a strip | belt-shaped base material. It is a longitudinal cross-sectional view which shows the case where the belt member which concerns on 2nd Embodiment is cut | disconnected along the longitudinal direction. It is a top view which shows the case where the belt member which concerns on the modification of 2nd Embodiment is seen from the 1st surface side of a strip | belt-shaped base material. It is a top view which shows the case where the belt member which concerns on 3rd Embodiment is seen from the 1st surface side of a strip | belt-shaped base material. It is a longitudinal cross-sectional view which shows the case where the belt member which concerns on the modification of 3rd Embodiment is cut | disconnected along a longitudinal direction. It is a longitudinal cross-sectional view which shows the case where the belt member which concerns on 4th Embodiment is cut | disconnected along a longitudinal direction.

<First Embodiment>
FIG. 1 is a perspective view showing a plastic bottle 1 with a handle. The plastic bottle 1 with handle includes a plastic bottle 50 and a belt member 10 attached to the plastic bottle 50. The belt member 10 constitutes a handle of the plastic bottle 1 with a handle.

[Plastic bottle]
The plastic bottle 50 has a main body portion 51 and a mouth portion 58. The main body 51 is a portion filled with a liquid. The main body 51 is configured to be filled with, for example, 5 liters or more of liquid. The mouth part 58 is a part for pouring out the liquid filled in the main body part 51 to the outside of the plastic bottle 50.

  The main body 51 has a cylindrical shape, and includes a top portion 52, a bottom portion 54 facing the top portion 52, and a side portion 56 that extends from the top portion 52 to reach the bottom portion 54. The mouth portion 58 described above is provided at the top portion 52 of the main body portion 51. As shown in FIG. 1, when the plastic bottle 50 is loaded in a water server or the like with the mouth portion 58 facing downward, the belt member 10 is preferably attached to the bottom portion 54 side. For example, as shown in FIG. 1, both ends of the belt member 10 are attached to the side portion 56 of the plastic bottle 50 so as to straddle the bottom portion 54 of the plastic bottle 50. Although not shown, both ends of the belt member 10 may be attached to the bottom 54 of the plastic bottle 50. Further, depending on the orientation of the plastic bottle 50 during use, such as when the plastic bottle 50 is loaded with the mouth portion 58 facing upward, the belt member 10 may be attached to the top portion 52 side of the plastic bottle 50. .

  In addition, as long as the main-body part 51 can accommodate the liquid of 2 liters or more, the shape of the main-body part 51 is not restricted to the above-mentioned cylindrical shape.

  Both the main body 51 and the mouth 58 of the plastic bottle 50 are made of the same material having thermoplasticity. For this reason, the plastic bottle 50 can be melted by heating and reused after use. As an example of the material constituting the main body 51 and the mouth 58, polyethylene terephthalate (PET) can be given.

[Belt member]
Next, the belt member 10 will be described. The belt member 10 includes a pair of adhesive portions 20 formed within a predetermined range from both ends of the belt member 10 and a grip portion 30 between the pair of adhesive portions 20. The bonding part 20 is a part bonded to the plastic bottle 50. An adhesive 17 is applied to the surface of the bonding portion 20. The grip portion 30 is a portion that is gripped when the user carries the plastic bottle 50 using the belt member 10. The adhesive 17 is not applied to the surface of the grip portion 30.

  Next, with reference to FIG. 2 and FIG. 3, the structure of the adhesion part 20 and the holding part 30 of the belt member 10 is demonstrated. FIG. 2 is a plan view showing a case where the belt member 10 before being attached to the plastic bottle 50 is viewed from the first surface side of the belt-like substrate. FIG. 3 is a longitudinal sectional view showing a case where the belt member 10 is cut along the longitudinal direction. The belt member 10 includes a strip-shaped base material 12 having flexibility, and an adhesive 17 applied to the first surface 13 of the strip-shaped base material 12. An adhesive 17 is applied to a region of the band-shaped substrate 12 that constitutes the bonding portion 20. On the other hand, the adhesive 17 is not applied to the area of the belt-shaped substrate 12 that constitutes the grip portion 30. The “first surface” is a surface of the surface of the belt-like substrate 12 that is attached to the plastic bottle 50. In addition, a “second surface” to be described later is a surface located on the opposite side of the first surface 13 among the surfaces of the band-shaped substrate 12.

  In FIG. 2, the symbol L1 represents the dimension of the strip-shaped substrate 12 in the longitudinal direction, and the symbol W1 represents the dimension of the strip-shaped substrate 12 in the direction orthogonal to the longitudinal direction. Reference numerals L <b> 2 and L <b> 3 represent the dimension of the adhesive portion 20 and the dimension of the grip portion 30 in the longitudinal direction of the belt-shaped substrate 12, respectively. In FIG. 3, reference signs T <b> 1 and T <b> 2 represent the thickness of the belt-like substrate 12 and the thickness of the adhesive 17, respectively. In the following description, each component in the longitudinal direction of the strip-shaped substrate 12 is sometimes referred to as “length”, and each component in a direction orthogonal to the longitudinal direction is sometimes referred to as “width”.

  As shown in FIG. 2, the strip-shaped substrate 12 may have a uniform width W1 regardless of the position. Such a strip-shaped base material 12 is obtained by, for example, cutting the strip-shaped base material 12 wound in a roll shape into a predetermined length. Or although not shown in figure, the strip | belt-shaped base material 12 may have different width W1 according to a position. For example, the width W <b> 1 of the bonding portion 20 may be larger than the width W <b> 1 of the grip portion 30. Such a strip-shaped base material 12 is obtained, for example, by punching a sheet-shaped base material into a strip shape.

  The size of the belt-like base material 12 is set so that the belt member 10 can be bent to the extent that the pair of adhesive portions 20 can be attached to the plastic bottle 50, that is, the belt member 10 has sufficient flexibility. Has been. For example, the width W1 of the strip-shaped substrate 12 is 15 mm or more and 80 mm or less, the length L1 of the strip-shaped substrate 12 is 200 mm or more and 800 mm or less, and the thickness T1 of the strip-shaped substrate 12 is 38 μm or more and 225 μm. It is as follows.

  As the material constituting the belt-like substrate 12, a material that has thermoplasticity and can be recycled is preferably used. More preferably, as the material constituting the belt-shaped substrate 12, the same material as that of the plastic bottle 50 or a material having a sufficient density difference between the material of the plastic bottle 50 is used. In the case where the same material as that of the plastic bottle 50 is used as the material constituting the belt-shaped substrate 12, the adhesive 17 is melted and the belt member 10 is removed from the plastic bottle 50 in the recycling process, and then the plastic bottle 50 and the belt. The members 10 can be recycled together. Further, when a material having a sufficient density difference with the material of the plastic bottle 50 is used as the material constituting the belt-shaped substrate 12, the adhesive 17 is dissolved in the recycling process to remove the belt member 10 from the plastic bottle 50. After removal, the plastic bottle 50 and the belt member 10 can be easily separated. For this reason, the plastic bottle 50 and the belt member 10 can be recycled separately. Examples of the material constituting the belt-like substrate 12 include PET, short-axis oriented polypropylene, biaxially oriented polypropylene (OPP), and synthetic paper.

  The dimensions of the bonding portion 20 and the adhesive 17 are set so that the belt member 10 can be stably bonded to the plastic bottle 50. For example, the thickness T2 of the adhesive 17 is 25 μm or more and 200 μm or less. 2 and 3 show examples in which the adhesive 17 is applied so as to reach both ends in the longitudinal direction of the belt-shaped substrate 12, but the present invention is not limited to this, and the adhesive 17 is strip-shaped. It does not have to reach both ends in the longitudinal direction of the substrate 12. Similarly, the adhesive 17 may not reach the end in the width direction of the band-shaped substrate 12 in the width direction of the band-shaped substrate 12.

  Next, the adhesive 17 applied to the belt-like substrate 12 will be described. The adhesive 17 is configured so that the belt member 10 can be easily detached from the plastic bottle 50 in the recycling process of the plastic bottle 50. For example, the adhesive 17 has a characteristic of being dissolved in a heated alkaline aqueous solution (hereinafter referred to as “thermal alkali peelability”). In this case, it is possible to dissolve the adhesive 17 when performing the process of cleaning the plastic bottle 50 using the alkaline aqueous solution heated in the recycling process.

  Hereinafter, the hot alkali peeling suitability will be described. Here, based on the evaluation of “cleaning peeling (thermal alkali)” of “mechanical peeling suitability / separation suitability” of “Voluntary Regulation Guidelines for Designated PET Bottles” by the PET Bottle Recycling Promotion Council, An example of determination will be described. Specifically, first, the plastic bottle 50 to which the bonding portion 20 of the belt member 10 is bonded via the adhesive 17 is cut into an 8 mm square to create a test piece. Next, the test piece is placed in an alkaline aqueous solution containing 1.5% by weight of sodium hydroxide heated to 85 ° C. or more. At this time, the ratio of the weight of the test piece to the total weight of the alkaline aqueous solution and the test piece is set to 10%. Thereafter, the aqueous alkaline solution is stirred for 15 minutes. When the piece of the adhesion part 20 of the belt member 10 peels from the piece of the plastic bottle 50 during stirring, it determines with the adhesive agent 17 having a hot alkali peelability.

  The material constituting the adhesive 17 is not particularly limited as long as it has the above-described hot alkali peelability. For example, as the adhesive 17, a label melt manufactured by Toyo Adre Co., Ltd. can be used.

[Belt member manufacturing method]
Next, a method for manufacturing the belt member 10 will be described with reference to FIG. First, the elongate strip-shaped base material 12 is prepared (preparation process). Next, as shown in FIG. 4, an adhesive 17 having hot alkali peelability is applied on the first surface 13 of the belt-shaped substrate 12 (application process). At this time, the adhesive 17 is applied within a predetermined range of the belt-like substrate 12. Specifically, the adhesive 17 is applied to the region corresponding to the adhesive portion 20 of the belt-shaped substrate 12, but the adhesive 17 is not applied to the region corresponding to the grip portion 30 of the belt-shaped substrate 12. For example, as shown in FIG. 4, the adhesive 17 is applied at a certain interval along the longitudinal direction of the belt-like substrate 12. The fixed interval is set so that the adhesive 17 exists in a predetermined range from both ends of the cut strip-shaped substrate 12 when the strip-shaped substrate 12 is cut to a predetermined length L1.

  By not applying the adhesive 17 to the region to be the grip portion 30, the amount of the adhesive 17 used can be reduced as compared with the case where the adhesive 17 is provided on the belt-like substrate 12 by lamination. As a result, the cost of the adhesive 17 can be reduced, and the recyclability of the belt member 10 can be improved. Then, the long strip | belt-shaped base material 12 with which the adhesive agent 17 was apply | coated may be wound up in roll shape, and a wound body may be created.

  Next, the belt-like substrate 12 coated with the adhesive 17 is unwound from the wound body, and the wound belt-like substrate 12 is cut into a predetermined length L1 (cutting step). At this time, as shown by a dotted line in FIG. 4, the belt-like substrate 12 is cut in the width direction at a portion where the adhesive 17 is provided. In this way, a belt member having a pair of adhesive portions 20 formed in a predetermined range from both ends and having the adhesive 17 applied to the surface thereof, and a grip portion 30 to which the adhesive 17 has not been applied to the surface. 10 can be prepared efficiently.

  Preferably, as an apparatus for cutting the belt-like substrate 12 coated with the adhesive 17 and wound in a roll shape, the operation of cutting the belt-like substrate 12 and the belt member 10 obtained by the cutting are plastic bottles An apparatus capable of performing both of the operations for attaching to the cover 50 is used. For example, the belt-like substrate 12 is cut and the belt member 10 is attached to the plastic bottle 50 using an automatic label attaching machine for attaching a label to the plastic bottle 50. As a result, the operation of mounting the belt member 10 on the plastic bottle 50 can be automated.

[Variation of manufacturing method of belt member]
In the above description, the example in which the belt member 10 is manufactured by cutting the long belt-like base material 12 to which the adhesive 17 is applied has been described. However, the manufacturing method of the belt member 10 is limited to this. There is nothing. For example, first, a sheet-like base material is prepared, then the adhesive 17 is partially applied to the base, and then the base material coated with the adhesive 17 is punched into a predetermined shape. The belt member 10 may be manufactured by a leaf method.

[Effect in the first embodiment]
As described above, in the belt member 10 and the manufacturing method thereof according to the first embodiment, the adhesive 17 applied to the adhesive portion 20 of the belt member 10 has thermal alkali peeling suitability. For this reason, the adhesive 17 can be dissolved when the plastic bottle 50 is washed with an alkaline aqueous solution in the recycling process of the plastic bottle 50. Thereby, the belt member 10 can be removed from the plastic bottle 50, and the plastic bottle 50 can be recycled.

  In the belt member 10 according to the first embodiment, the adhesive 17 is not applied to the grip portion 30. For this reason, the alkaline aqueous solution can contact not only the end surface of the adhesive 17 in the width direction of the belt-like substrate 12 but also the end surface of the adhesive 17 in the longitudinal direction of the belt-like substrate 12 from the grip portion 30 side. Thereby, the rate at which the adhesive 17 is dissolved in the alkaline aqueous solution can be increased.

<Second Embodiment>
FIG. 5 is a plan view showing a case where the belt member 10 according to the second embodiment is viewed from the first surface 13 side of the belt-like substrate 12. FIG. 6 is a longitudinal sectional view showing a case where the belt member 10 is cut along a line VI-VI extending in the longitudinal direction through the plurality of holes 15. As shown in FIGS. 5 and 6, a plurality of holes 15 penetrating from the first surface 13 to the second surface 14 of the belt-like substrate 12 are formed in the pair of adhesive portions 20 of the belt-like substrate 12 of the belt member 10. May be.

  As shown in FIG. 5, the plurality of holes 15 may be formed in a square lattice shape in plan view. The square lattice shape means that the plurality of holes 15 can be connected by a plurality of first straight lines extending in the first direction and a plurality of second straight lines extending in the second direction intersecting the first direction. doing. In other words, in the lattice shape, the plurality of holes 15 are regularly arranged at predetermined intervals in the first direction, and also regularly arranged at predetermined intervals in the second direction intersecting the first direction. Means that

  Although not shown, the plurality of holes 15 may be regularly formed in a form other than a quadrangular lattice in plan view. For example, the plurality of holes 15 may be formed in a hexagonal lattice shape, an octagonal lattice shape, or the like in plan view. In addition, the plurality of holes 15 may be formed randomly in a plan view.

The dimension S of the hole 15 is such that the alkaline aqueous solution contacting the second surface 14 of the belt-like substrate 12 of the belt member 10 in the recycling process of the plastic bottle 50 can reach the first surface 13 side through the hole 15. Is set. Preferably, the dimension S of the hole 15 is set so that the adhesive 17 does not penetrate into the hole 15 at all or almost when the adhesive 17 is applied to the belt-like substrate 12. For example, the dimension S of the hole 15 is 0.01 mm or more and 3 mm or less. For this reason, the alkaline aqueous solution can contact not only the end surface of the adhesive 17 in the width direction and the longitudinal direction of the strip-shaped substrate 12 but also the surface of the adhesive 17 on the strip-shaped substrate 12 side through the holes 15. it can. Thereby, the rate at which the adhesive 17 is dissolved in the alkaline aqueous solution can be increased.
The dimension S of the hole 15 may be set so that the alkaline aqueous solution contacting the second surface 14 of the strip-shaped substrate 12 can reach the first surface 13 side through the hole 15 by capillary action. Accordingly, the alkaline aqueous solution can contact the adhesive 17 through the holes 15 regardless of the gravity, in other words, regardless of the posture of the belt member 10. When the capillary phenomenon is used, the dimension S of the hole 15 is set to, for example, less than 1 mm.

  In FIG. 5, the distance between two adjacent holes 15 is represented by D. The interval D of the holes 15 is set so that the adhesive 17 can be dissolved within, for example, 15 minutes during a predetermined processing time in the recycling process, and is, for example, 0.1 mm or more and 8 mm or less. .

  Preferably, as shown in FIGS. 5 and 6, the plurality of holes 15 are formed not only in the region constituting the adhesive portion 20 but also in the region constituting the grip portion 30 in the belt-like base material 12. In this case, preferably, the regularity of the arrangement of the plurality of holes 15 formed in the belt-like base material 12 constituting the adhesive portion 20 and the plurality of holes 15 formed in the belt-like base material 12 constituting the gripping portion 30 are preferable. The regularity of arrangement is the same. Hereinafter, the advantage of forming the plurality of holes 15 in this way will be described.

  First, for the sake of comparison, a case will be considered in which the holes 15 are formed only in the region constituting the bonding portion 20 of the strip-shaped substrate 12. In this case, in the coating step of applying the adhesive 17 to the strip-shaped substrate 12, it is necessary to perform control such that the adhesive 17 is applied to a portion of the long strip-shaped substrate 12 where the plurality of holes 15 are formed. There is. On the other hand, in the coating step, as described above, it is necessary to perform control such that the adhesive 17 is applied to the long belt-like substrate 12 with a certain interval. Thus, when the hole 15 is formed only in the area | region which comprises the adhesion part 20 among the strip | belt-shaped base materials 12, the control element in an application | coating process will increase, For this reason, an application | coating process will become complicated.

  On the other hand, in this modification, since the plurality of holes 15 are formed in the entire region of the belt-like substrate 12 with the same regularity, the belt-like substrate 12 in a state before the adhesive 17 is applied is formed. There is no distinction between the bonded portion 20 and the grip portion 30. For this reason, it is not necessary to perform control of adjusting the application position of the adhesive 17 with respect to the position of the hole 15 in the application process. Thereby, the manufacturing efficiency of the belt member 10 can be increased.

  In the above description, the example in which the plurality of holes 15 are formed in a lattice shape or randomly in the plan view in the belt-like base material 12 is shown, but the present invention is not limited to this. For example, as shown in FIG. 7, the plurality of holes 15 may be formed in a broken line shape along the longitudinal direction of the belt-like substrate 12. Although not shown, the plurality of holes 15 may be formed in a broken line shape along a predetermined direction other than the longitudinal direction of the belt-like substrate 12. Also in these cases, the dimension S of the hole 15 is set so that the alkaline aqueous solution can pass through the hole 15. For this reason, the speed | rate in which the adhesive agent 17 melt | dissolves in aqueous alkali solution can be raised.

<Third Embodiment>
FIG. 8 is a plan view illustrating a case where the belt member 10 according to the third embodiment is viewed from the first surface 13 side of the belt-like substrate 12. As shown in FIG. 8, in the bonding portion 20, the adhesive 17 may be dispersed in a plurality of regions and applied to the band-shaped substrate 12. In this case, as shown in FIG. 8, there is a gap 18 between the adhesive 17 applied to the bonding portion 20. For this reason, the aqueous alkaline solution can enter the gap 18 of the adhesive 17 in the recycling process of the plastic bottle 50, whereby the area of the adhesive 17 in contact with the aqueous alkaline solution can be further increased. This can further increase the speed at which the adhesive 17 is dissolved in the alkaline aqueous solution.

  The thickness T2 of the adhesive 17 is 25 μm or more and 200 μm or less. The distance between the belt-like substrate 12 bonded by the adhesive 17 and the plastic bottle 50 is also equal to the thickness T2 of the adhesive 17. Therefore, the dimension of the flow path of the alkaline aqueous solution formed between the belt-like substrate 12 and the plastic bottle 50 in the gap 18 of the adhesive 17 is also equal to the thickness T2 of the adhesive 17. For this reason, in the flow path of the alkaline aqueous solution formed between the belt-shaped substrate 12 and the plastic bottle 50 in the gap 18 of the adhesive 17, the alkaline aqueous solution can move by capillary action.

  FIG. 9A and FIG. 9B are longitudinal sectional views showing a case where the belt member 10 according to the modification of the third embodiment is cut along the longitudinal direction. As shown in FIGS. 9 (a) and 9 (b), also in the belt member 10 according to the third embodiment, a plurality of holes are formed in the belt-like substrate 12 as in the case of the second embodiment. 15 may be formed. As a result, the alkaline aqueous solution that reaches the first surface 13 through the hole 15 can be brought into contact with the adhesive 17. This can further increase the speed at which the adhesive 17 is dissolved in the alkaline aqueous solution.

  Preferably, as shown in FIG. 9A, when viewed along the normal direction of the first surface 13 of the strip-shaped substrate 12, the gap 18 of the adhesive 17 and the holes 15 of the strip-shaped substrate 12 are at least The holes 15 and the adhesive 17 are disposed so as to partially overlap. In this case, the alkaline aqueous solution that has reached the first surface 13 side through the hole 15 can enter the gap 18 of the adhesive 17. This can further increase the speed at which the adhesive 17 is dissolved in the alkaline aqueous solution. Note that, as shown in FIG. 9B, a hole 15 that is entirely covered with the adhesive 17 may be present in the belt-like substrate 12.

  Although FIG. 8 shows an example in which the plurality of regions of the adhesive 17 and the gaps 18 extend in the longitudinal direction of the belt-like substrate 12, the present invention is not limited to this. For example, the plurality of regions of the adhesive 17 and the gaps 18 may extend in the width direction of the strip-shaped substrate 12. FIG. 8 shows an example in which the adhesive 17 is dispersed in a plurality of regions and applied to the adhesive portion 20. However, as long as the gap 18 is formed in the adhesive 17, the distribution of the adhesive 17 is particularly There is no limit. For example, the adhesive 17 may be applied in a mesh shape so that the gap 18 is provided.

<Fourth Embodiment>
In each above-mentioned embodiment, the example in which the adhesive agent 17 was not apply | coated to the area | region which comprises the holding part 30 among the strip | belt-shaped base materials 12 was shown. In the present embodiment, an example will be described in which the adhesive 17 is also applied to a region constituting the grip portion 30 of the belt-shaped substrate 12. FIG. 10 is a longitudinal sectional view showing a case where the belt member 10 according to the fourth embodiment is cut along the longitudinal direction.

  The belt member 10 includes a flexible belt-like base material 12, an adhesive 17 applied to the entire first surface 13 of the belt-like base material 12, and a covering material 19 provided on the adhesive 17. I have. The adhesive 17 applied to the region constituting the bonding portion 20 in the belt-like substrate 12 is not covered with the covering material 19 and is exposed on the surface of the belt member 10. On the other hand, the adhesive 17 applied to the region constituting the grip portion 30 of the belt-like substrate 12 is covered with the covering material 19 and is not exposed on the surface of the belt member 10. For this reason, the user can grip the grip portion 30 when carrying the plastic bottle 50 using the belt member 10.

  As the covering material 19, a material having flexibility and capable of preventing the adhesive 17 of the grip portion 30 from touching the user's hand is used. For example, the covering material 19 is paper, film, ink, or the like. The covering material 19 may be provided on the adhesive 17 by lamination, or may be provided on the adhesive 17 by printing.

[Belt member manufacturing method]
A method for manufacturing the belt member 10 according to the present embodiment will be described. First, the elongate strip-shaped base material 12 is prepared (preparation process). Next, the adhesive 17 having hot alkali peeling suitability is applied to the entire first surface 13 of the belt-like substrate 12 (application process). Thereafter, the covering material 19 is provided on the adhesive 17 applied to the region corresponding to the grip portion 30 in the belt-like substrate 12. Next, a long laminate including the belt-like substrate 12, the adhesive 17, and the covering material 19 is wound into a roll shape to create a wound body.

  Next, the laminated body is unwound from the wound body, and the unwound laminated body is cut into a predetermined length L1 (cutting step). At this time, the laminate is cut in the width direction in the region where the adhesive 17 is applied to the surface. In this way, a pair of adhesive portions 20 formed in a predetermined range from both ends of the belt-like base material 12 and having the adhesive 17 applied to the surface, and a grip portion 30 to which the adhesive 17 has not been applied to the surface, Can be efficiently prepared.

  Also in the present embodiment, a plurality of holes 15 may be formed in the belt-like substrate 12 as in the case of the second embodiment described above. Also in the present embodiment, as in the case of the third embodiment described above, the adhesive 17 may be dispersed on a plurality of regions and applied onto the band-shaped substrate 12.

[Variation of manufacturing method of belt member]
In the above description, an example in which the belt member 10 is manufactured by cutting a long laminate including the belt-like base material 12, the adhesive 17, and the covering material 19 has been described. Is not limited to this. For example, first, a sheet-like base material is prepared, and then an adhesive 17 is applied on the base material, and then a coating material 19 is partially provided on the adhesive 17 to cover a part of the adhesive. The belt member 10 may be manufactured by a single wafer method by covering with a material 19 and then punching out a laminate including the belt-like base material 12, the adhesive 17, and the covering material 19 into a predetermined shape.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

[Recyclability]
(Example A1)
First, a test piece was prepared by cutting the plastic bottle 50 to which the belt-like substrate 12 was bonded via the adhesive 17 into an 8 mm square. As test specimens, adhesives 17 having a thickness of 25 μm, 40 μm, and 60 μm were prepared, respectively. As the adhesive 17, a label melt manufactured by Toyo Adre Co., Ltd., having hot alkali peeling suitability was used. As the strip-shaped substrate 12, a substrate made of OPP and having no holes 15 formed therein was used. Next, the test piece was put in an alkaline aqueous solution containing 1.5% by weight of sodium hydroxide heated to 85 ° C. or more. At this time, the ratio of the weight of the test piece to the total weight of the alkaline aqueous solution and the test piece was set to 10%. Thereafter, the alkaline aqueous solution was stirred for 15 minutes, and it was observed whether or not the piece of the belt-like substrate 12 was peeled off from the piece of the plastic bottle 50 during the stirring. As a stirrer, PM204 manufactured by ASONE Co., Ltd. was used. The number of rotations of stirring was 340 rpm.

(Example A2)
As in the case of Example A1, the band-shaped substrate 12 was used while stirring the alkaline aqueous solution except that a band-shaped substrate 12 having a plurality of holes 15 formed in a lattice shape as shown in FIG. 5 was used. It was observed whether the piece of the base material 12 peeled from the piece of the plastic bottle 50.

(Example A3)
As in the case of Example A1, the band-shaped substrate 12 was used while stirring the alkaline aqueous solution except that a substrate 12 having a plurality of holes 15 formed in broken lines as shown in FIG. 7 was used. It was observed whether the piece of the base material 12 peeled from the piece of the plastic bottle 50.

(Example A4)
Except that the adhesive 17 was applied in a striped pattern on the strip-shaped substrate 12, the strip of the strip-shaped substrate 12 is a strip of the plastic bottle 50 during the stirring of the alkaline aqueous solution in the same manner as in Example A1 described above. It was observed whether it peeled off.

(Comparative Example A1)
The strip of the strip-shaped substrate 12 is made of plastic during stirring of the alkaline aqueous solution in the same manner as in Example A1, except that the adhesive 17 is an acrylic material that does not have hot alkali peelability. It was observed whether it peeled from the piece of the bottle 50. FIG.

The evaluation results in Examples A1 to A4 and Comparative Example A1 are summarized in Table 1. In Table 1, “◯” means that the strip of the strip-shaped substrate 12 completely peeled from the strip of the plastic bottle 50 during the stirring of the alkaline aqueous solution during the stirring for 15 minutes. “Δ” means that the strip of the strip-shaped substrate 12 partially peeled from the strip of the plastic bottle 50 during the stirring of the alkaline aqueous solution during the stirring for 15 minutes. “X” means that the strip of the strip-shaped substrate 12 hardly peeled from the strip of the plastic bottle 50 during the stirring of the alkaline aqueous solution during the stirring for 15 minutes. As described above, the rotational speed of stirring is 340 rpm, and this rotational speed is lower than the rotational speed in the actual recycling process. For this reason, the stirring ability in Examples A1 to A4 and Comparative Example A1 is smaller than the stirring ability in the actual recycling process. Therefore, in this evaluation, the strip of the strip-shaped base material 12 does not completely peel from the strip of the plastic bottle 50, and the alkaline aqueous solution is stirred at a higher speed even under the condition that the evaluation result is “Δ”. In the recycling, there is a possibility that the strip of the belt-like base material 12 is appropriately peeled from the piece of the plastic bottle 50. In Example A4, since the evaluation result when the thickness of the adhesive 17 is 40 μm and 60 μm was “◯”, the amount of the adhesive is smaller, and a better evaluation result is expected. Evaluation was not carried out for the case of a thickness of 25 μm. Similarly, in Comparative Example A1, since the evaluation result when the thickness of the adhesive 17 was 25 μm was x, the evaluation for setting the thickness of the adhesive 17 to 40 μm and 60 μm was not performed.

  As can be seen from Examples A1 to A3, by using the adhesive 17 having thermal alkali peelability, when the thickness of the adhesive 17 is 25 μm, the piece of the belt-like substrate 12 is peeled from the piece of the plastic bottle 50. I was able to. Further, as can be seen from Examples A2 and A3, by forming the holes 15 in the belt-like base material 12, even if the thickness of the adhesive 17 is 40 μm or 60 μm, the piece of the belt-like base material 12 is removed from the plastic bottle. It was possible to peel from 50 pieces. Further, as can be seen from Example A4, by applying the adhesive 17 in a striped pattern, even if the thickness of the adhesive 17 is 60 μm, the piece of the strip-like base material 12 is removed from the piece of the plastic bottle 50. It could be peeled off.

[180 ° peel strength]
(Example B1)
First, a PET film having a thickness of 100 μm to which the belt-like substrate 12 was bonded via the adhesive 17 was cut into a 35 mm square to prepare a test piece. As the adhesive 17 and the strip-shaped substrate 12, the same ones as in the case of Example A1 described above were used. Next, using a tensile tester MX2-500N-L-FA manufactured by IMADA Co., Ltd., a 180 ° peel test was performed, and the force required to peel the strip substrate 12 from the PET film (hereinafter, peel strength) Measured).

(Example B2)
The peel strength was measured in the same manner as in Example B1, except that a strip-shaped substrate 12 having a plurality of holes 15 formed in a lattice shape as shown in FIG. 5 was used.

(Example B3)
The peel strength was measured in the same manner as in Example B1, except that a strip-shaped substrate 12 having a plurality of holes 15 formed in a broken line shape as shown in FIG. 7 was used.

(Example B4)
The peel strength was measured in the same manner as in Example B1, except that the adhesive 17 was applied in a striped pattern on the strip substrate 12.

(Comparative Example B1)
The peel strength was measured in the same manner as in Example B1 except that an adhesive having no hot alkali peelability was used as the adhesive 17.

Table 2 shows the peel strengths measured in Examples B1 to B4 and Comparative Example B1. As shown in Table 2, in Examples B1 to B3, substantially the same peel strength was obtained. That is, no decrease in peel strength due to the formation of the holes 15 in the belt-like substrate 12 was observed. Further, as can be seen from Example B4, no decrease in peel strength due to application of the adhesive 17 in a striped pattern was observed. Moreover, as can be seen from the comparison between Examples B1 to B4 and Comparative Example B1, when the adhesive 17 having the hot alkali peelability is used, the acrylic adhesive 17 having no hot alkali peelability is used. Compared with the case of using, high adhesive strength was obtained.

[Hanging test and drop test]
(Example C1)
First, a plastic bottle 50 having a capacity of 12 liters, to which the belt member 10 was bonded via the adhesive 17, was prepared. As the adhesive 17 and the strip-shaped substrate 12, the same ones as in the case of Example A1 described above were used. Next, the belt member 10 was hooked on a support rod extending in the horizontal direction, and the plastic bottle 50 was suspended so that the mouth portion 58 of the plastic bottle 50 faced downward. It was observed whether this suspended state could be maintained for 1 hour.

  Further, the grip part 30 of the belt member 10 bonded to the plastic bottle 50 placed on the reference surface is gripped, the plastic bottle 50 is lifted to a height of 30 cm from the reference surface, and then the grip part 30 is released to release the plastic bottle. 50 was dropped. The dropping was repeated 10 times, and it was observed whether the belt member 10 was detached from the plastic bottle 50.

(Example C2)
As in the case of Example C1, the suspension test and the drop test were performed except that the strip-shaped substrate 12 was used in which a plurality of holes 15 were formed in a lattice shape as shown in FIG. went.

(Example C3)
A suspension test and a drop test were performed in the same manner as in Example C1 except that the belt-shaped substrate 12 was used in which a plurality of holes 15 were formed in a broken line as shown in FIG. went.

(Example C4)
A drop test was performed in the same manner as in Example C1 except that the adhesive 17 was applied in a striped pattern on the strip substrate 12.

(Comparative Example C1)
A hanging test and a drop test were performed in the same manner as in Example C1 except that an acrylic material having no hot alkali peelability was used as the adhesive 17.

Table 3 summarizes the results of the hanging test and the drop test in Examples C1 to C4 and Comparative Example C1. Regarding the suspension test, “◯” means that the suspended state could be maintained for 1 hour. Regarding the drop test, “◯” means that the belt member 10 was not detached from the plastic bottle 50 after the drop was repeated 10 times. As can be seen from Examples C1 to C3, when the adhesive 17 having thermal alkali peelability was used, sufficient resistance to hanging and dropping could be secured. Further, as can be seen from Example C4, even when the adhesive 17 having the hot alkali peelability was applied in a striped pattern, sufficient resistance to dropping could be secured.

[Evaluation of capillary phenomenon]
First, a test piece was prepared by cutting the plastic bottle 50 to which the belt-like substrate 12 was bonded through the adhesive 17 applied in a striped pattern. The dimension of the gap in the direction along the surface of the belt-like substrate 12 between the regions of the plurality of adhesives 17 applied in a striped pattern was in the range of 2 mm to 4.5 mm. The thickness of the adhesive 17 was 60 μm.

  Next, the lower end of the test piece was immersed in an aqueous solution contained in a beaker. Thereafter, it was visually confirmed whether or not the aqueous solution moved upward in the test piece. As a result, it was confirmed that the aqueous solution moved. By setting the thickness of the adhesive 17 to 60 μm and thereby setting the width of the flow path between the plurality of striped adhesive 17 regions to about 60 μm, it is considered that the aqueous solution has moved by capillary action. In this evaluation, a colored aqueous solution was used so that the movement of the aqueous solution could be easily confirmed visually.

DESCRIPTION OF SYMBOLS 1 Plastic bottle 10 with a handle Belt member 12 Band-shaped base material 13 1st surface 14 2nd surface 15 Hole 17 Adhesive 18 Crevice 19 Covering material 20 Adhesion part 30 Grasping part 50 Plastic bottle 51 Main part 52 Top part 54 Bottom part 56 Side part 58 Mouth

Claims (11)

A belt member that is attached to a plastic bottle having thermoplasticity and includes a belt-shaped substrate,
A pair of adhesive portions formed in a predetermined range from both ends of the belt member, and an adhesive having thermal alkali peelability applied to the surface;
A gripping part between the pair of adhesive parts where the adhesive is not applied to the surface;
A belt member. In the adhesive portion, the adhesive is applied in a dispersed manner in a plurality of regions.
The belt member according to claim 1. In the adhesive portion, a plurality of holes penetrating from a first surface mounted on the plastic bottle among the surfaces of the belt-like base material to a second surface located on the opposite side of the first surface are formed. ,
The belt member according to claim 1 or 2. The plurality of holes are formed in a broken line shape along the longitudinal direction of the belt-shaped substrate.
The belt member according to claim 3. The plurality of holes are formed in a lattice shape,
The belt member according to claim 3.   The belt member according to any one of claims 1 to 5, wherein the adhesive is not applied to the belt-shaped base material in the grip portion.   The belt member according to any one of claims 1 to 5, wherein in the grip portion, the adhesive applied to the belt-shaped substrate is covered with a covering material. A method of manufacturing a belt member to be attached to a plastic bottle having thermoplasticity,
A preparation step of preparing a belt-shaped substrate;
An application step of applying an adhesive having thermal alkali peelability within a predetermined range of the belt-shaped substrate;
Having
Belt member manufacturing method. A method of manufacturing a belt member to be attached to a plastic bottle having thermoplasticity,
A preparation step of preparing a belt-shaped substrate;
An application step of applying an adhesive having thermal alkali peelability to the belt-shaped substrate,
Covering a part of the adhesive applied to the belt-shaped substrate with a covering material;
Having
Belt member manufacturing method. In the preparation step, the elongated belt-like base material is prepared,
In the application step, the adhesive is applied to the elongated belt-like substrate,
The belt member manufacturing method further includes a cutting step of cutting the long strip-shaped base material coated with the adhesive into a predetermined length.
The belt member manufacturing method according to claim 8 or 9. In the application step, after the adhesive is applied to the elongated strip-shaped substrate, the wound strip is wound into a roll to create a wound body,
In the cutting step, the long strip-shaped substrate coated with the adhesive is unwound from the wound body, and the unrolled strip-shaped substrate is cut into a predetermined length.
The belt member manufacturing method according to claim 10.