Tape and containers with tape

Abstract

In a tape that includes a portion formed from biomass resin, the goal is to suppress surface stickiness while ensuring a sufficient biomass resin content. [Solution] A tape is provided, whose cross-sectional shape includes an engaging portion and a base portion having a first surface on which the engaging portion protrudes and a second surface on the opposite side of the engaging portion, comprising a first resin portion formed of a first resin composition mainly composed of fossil fuel-derived resin that at least partially covers the first surface in the cross-sectional shape, and a second resin portion formed of a second resin composition mainly composed of biomass resin that constitutes the portion other than the first resin portion.

Description

Technical Field

[0001] The present invention relates to a tape and a container with a tape.

Background Art

[0002] In recent years, from the perspective of reducing environmental impact and achieving carbon neutrality, replacing fossil fuel-derived resins with biomass resins has become widespread. For example, Patent Document 1 and Patent Document 2 describe tapes or zipper tapes that can be formed of biomass resins such as biopolyethylene.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as the proportion of biomass resin contained in the resin forming members such as tapes increases, stickiness occurs on the surface of the members. This stickiness may cause resistance when, for example, attaching a tape to a film of a container body to perform bag-making processing, leading to poor appearance of the product, or may cause a decrease in functionality when opening and closing due to the adhesion of contents to the inside of a zipper tape.

[0005]

Means for Solving the Problems

[0006] [1] A tape whose cross-sectional shape includes an engaging portion and a base portion having a first surface on which the engaging portion protrudes and a second surface opposite to the engaging portion, the tape comprising a first resin portion formed of a first resin composition mainly composed of a resin derived from fossil fuels and which at least partially covers the first surface in the cross-sectional shape, and a second resin portion formed of a second resin composition mainly composed of a biomass resin and which constitutes the portion other than the first resin portion. [2] The tape according to [1], wherein the first resin portion covers the entire portion of the first surface other than the engagement portion. [3] The tape according to [1] or [2], wherein the first resin portion includes a portion that covers the first surface and a portion that covers the end face of the base. [4] The tape according to any one of [1] to [3], wherein the first resin portion further includes a portion that at least partially covers the second surface. [5] The tape according to any one of [1] to [4], wherein the second resin portion includes a portion that constitutes the entirety of the engaging portion. [6] The tape according to any one of [1] to [4], wherein the second resin portion includes a portion that constitutes the core of the engaging portion, and the first resin portion includes a portion that covers the first surface and a portion that covers the core of the engaging portion. [7] The tape according to any one of [1] to [4], wherein the first resin portion includes a portion that covers the first surface and a portion that constitutes the entirety of the engaging portion. [8] The tape according to any one of [1] to [7], wherein the biomass resin comprises biopolyethylene. [9] The tape according to any one of [1] to [8], wherein the resin derived from fossil fuels comprises polyethylene.

[10] The polyethylene has a density of 900 kg / m³ 3 More than 940kg / m 3 The tape described in [9] is as follows:

[11] The polyethylene tape according to [9] or

[10] , wherein the melt flow rate is 0.5 g / 10 min or more and 15 g / 10 min or less.

[12] The tape according to any one of [1] to

[11] , wherein the thickness of the portion of the first resin portion that covers the first surface is 10 μm or more.

[13] The tape according to any one of [1] to

[12] , further comprising a third resin portion that constitutes a sealing layer that at least partially covers the second surface.

[14] The tape according to any one of [1] to

[13] , wherein the first resin portion includes a portion that covers the first surface and a projection that protrudes from the portion that covers the first surface. A tape according to any one of [1] to

[14] , comprising a first tape having a cross-sectional shape that includes the engaging portion and the base having a first outer shape, and a second tape having a cross-sectional shape that includes the engaging portion and the base having a second outer shape that is paired with the first outer shape.

[16] A tape-attached container comprising a container body and the tape described in

[15] , wherein the tape is attached to the container body such that the first surface of the first tape and the first surface of the second tape face each other. [Effects of the Invention]

[0007] According to the above configuration, since fossil fuel-derived resins have less surface stickiness compared to biomass resins, the placement of the first resin portion suppresses stickiness on the engagement side of the base, preventing, for example, poor appearance due to resistance during bag making and a decrease in the functionality of the zipper tape due to adhesion of contents. In addition, since the proportion of the second resin portion is high in the tape as a whole, the biomass resin content can be ensured. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows an example of a tape according to an embodiment of the present invention. [Figure 2] This figure shows another example of a tape according to an embodiment of the present invention. [Figure 3] This figure shows yet another example of a tape according to an embodiment of the present invention. [Figure 4]It is a diagram schematically showing yet another example of the tape according to an embodiment of the present invention. [Figure 5] It is a diagram schematically showing yet another example of the tape according to an embodiment of the present invention. [Figure 6] It is a diagram schematically showing yet another example of the tape according to an embodiment of the present invention. [Figure 7] It is a diagram schematically showing yet another example of the tape according to an embodiment of the present invention. [Figure 8] It is a diagram schematically showing yet another example of the tape according to an embodiment of the present invention. [Figure 9] It is a diagram schematically showing yet another example of the tape according to an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

[0010] In the present specification, the biomass resin is a polymer material made from a renewable organic resource as a raw material, specifically a substance derived from a biomass resource such as a plant, and means what is also called biomass plastic. Specifically, the biomass resin includes bio polyethylene, bio polypropylene, and the like. The resin derived from fossil fuel means a polymer material made from a substance derived from a fossil fuel such as petroleum. When simply referring to polyethylene, polypropylene, etc., it means polyethylene, polypropylene, etc. derived from fossil fuel.

[0011] In addition, in this specification, the main component of the resin composition means the component with the highest content among the components of the resin composition. The resin composition may contain only the main component or may contain other components in addition to the main component. The main component of the resin composition can be confirmed, for example, by IR method. The content of the components of the resin composition is expressed in mass% with respect to the whole resin composition unless otherwise specified. That the main component of the resin composition is a biomass resin can be confirmed, for example, by the biomass content being 70% or more measured in accordance with ASTM D6866. From the viewpoint of reducing environmental load, the biomass content of the biomass resin is preferably 80% or more, and more preferably 90% or more.

[0012] FIG. 1 is a diagram showing an example of a tape according to an embodiment of the present invention. In the illustrated example, the tape 20 is a zipper tape having engaging portions 21A and 21B, and is attached to the film 10 of the container body to form a container 1 with a tape. The tape 20 includes a first tape 20A including an engaging portion 21A and a base portion 22A in a cross-sectional shape, and a second tape 20B including an engaging portion 21B and a base portion 22B in a cross-sectional shape. The engaging portion 21A has a male profile, and the engaging portion 21B has a female profile that mates with the male profile, but is not limited to this example, and the engaging portion may have other types of profiles such as a hook type.

[0013] In the first tape 20A, the base portion 22A has a first surface from which the engaging portion 21A protrudes and a second surface opposite to the engaging portion 21A. The first tape 20A includes a first resin portion 201A that partially covers the first surface of the base portion 22A, a second resin portion 202A that constitutes the other portion of the base portion 22A and the engaging portion 21A, and a third resin portion 203A that constitutes a seal layer covering the second surface of the base portion 22A. Similarly, the second tape 20B includes a first resin portion 201B that partially covers the first surface (the surface from which the engaging portion 21B protrudes) of the base portion 22B, a second resin portion 202B that constitutes the other portion of the base portion 22B and the engaging portion 21B, and a third resin portion 203B that constitutes a seal layer covering the second surface (the surface opposite to the engaging portion 21B) of the base portion 22B.

[0014] In the following description, we will explain the first resin portion 201A, the second resin portion 202A, and the third resin portion 203A of the first tape 20A, but the same applies to the first resin portion 201B, the second resin portion 202B, and the third resin portion 203B of the second tape 20B.

[0015] In the first tape 20A, the main component of the first resin composition constituting the first resin portion 201A is a fossil fuel-derived resin, and the main component of the second resin portion 202A is a biomass resin. The fossil fuel-derived resin may be polyethylene, for example, and the biomass resin may be biopolyethylene, for example, but is not limited to these examples.

[0016] In the first tape 20A described above, the surface of the base 22A on the engagement portion 21A side is partially covered with the first resin portion 201A, which is mainly composed of fossil fuel-derived resin, and is made of a second resin portion 202A mainly composed of biomass resin. Since fossil fuel-derived resin has less surface stickiness than biomass resin, the placement of the first resin portion 201A suppresses stickiness on the surface of the base 22A on the engagement portion 21A side, thereby preventing, for example, poor appearance due to resistance during bag making and a decrease in the functionality of the zipper tape due to adhesion of contents. Furthermore, since the first resin portion 201A is placed only on the surface of the base 22A, the proportion of the second resin portion 202A is high in the first tape 20A as a whole, and the biomass resin content can be ensured.

[0017] The thickness of the portion of the first resin part 201A that covers the surface of the base part 22A on the engagement part 21A side is, for example, 10 μm or more, preferably 20 μm or more, and more preferably 30 μm or more. The upper limit of the thickness is not particularly limited, but from the viewpoint of ensuring the biomass resin content, it is, for example, 100 μm or less, preferably 80 μm or less, and more preferably 50 μm or less. Furthermore, if the resin derived from fossil fuels, which is the main component of the first resin part 201A, is polyethylene, the density of polyethylene is 900 kg / m³. 3 More than 940kg / m 3Preferably, the following conditions apply, and the melt flow rate is preferably 0.5 g / 10 min or more and 15 g / 10 min or less.

[0018] The first tape 20A and the second tape 20B described above are attached to the first surface 111A and the second surface 111B of the film 10 of the container body, respectively. The first surface 111A and the second surface 111B are opposing surfaces, and the first tape 20A and the second tape 20B are joined to the first surface 111A and the second surface 111B by a sealing layer that covers their respective second surfaces. Therefore, the first surface of the first tape 20A attached to the film 10 (the surface on which the engaging portion 21A protrudes) and the first surface of the second tape 20B (the surface on which the engaging portion 21B protrudes) face each other. As described above, in this embodiment, the tape alone can prevent defects in appearance due to resistance during bag-making and a decrease in functionality due to adhesion of contents. Furthermore, as in this example, by suppressing stickiness on the surfaces of the first tape 20A and the second tape 20B that face each other in the tape-attached container 1, a decrease in functionality due to adhesion between these surfaces due to stickiness can also be prevented.

[0019] As already mentioned, in the first tape 20A, the third resin portion 203A constitutes a sealing layer, and the base portion 22A of the first tape 20A is joined to the first surface 111A of the film 10 via the sealing layer. When the first tape 20A is joined to the first surface 111A by heat sealing or ultrasonic sealing, the third resin portion 203A has a density of, for example, 850 kg / m³ 3 More than 905kg / m 3The material is formed from a resin composition mainly composed of polyethylene, but is not limited to this example. Alternatively, the third resin portion 203A may be a layer of adhesive. It is also possible to directly join the second resin portion 202A (the first resin portion in other examples described later) that constitutes the second surface of the base portion 22A (the surface opposite to the engaging portion 21A) to the first surface 111A, and in many cases the third resin portion 203A is provided to improve the wrinkled appearance of the bag by lowering the heat sealing temperature. Therefore, the third resin portion may not be provided if it is not necessary, for example. The same applies to the following examples, and the third resin portion may be omitted in examples where the third resin portion 203A and 203B are shown. Alternatively, for example for the purposes described above, the third resin portion may be provided in examples where the third resin portion is not shown, such as in Figures 4 to 9.

[0020] Figure 2 shows another example of a tape according to an embodiment of the present invention. In the illustrated example, the first resin portion 201A of the first tape 20A and the first resin portion 201B of the second tape 20B completely cover the first surfaces of the respective base portions 22A and 22B (the surfaces on which the engaging portions 21A and 21B protrude), excluding the engaging portions 21A and 21B. The rest of the configuration is the same as the example described above with reference to Figure 1. By having the first resin portions 201A and 201B completely cover the first surfaces of the base portions excluding the engaging portions 21A and 21B, the effect of suppressing stickiness on these surfaces can be further enhanced.

[0021] Figure 3 shows yet another example of a tape according to an embodiment of the present invention. In the illustrated example, a rib-shaped projection 23A is formed protruding from the first resin portion 201A of the first tape 20A, and a rib-shaped projection 23B is formed protruding from the portion covering the first resin portion 201B of the second tape 20B, specifically the first surface of the base portions 22A, 22B (the surface from which the engaging portions 21A, 21B protrude). By forming the projections 23A, 23B on the first resin portions 201A, 201B, which are mainly composed of fossil fuel-derived resin, the contact area between the first surfaces of the base portions 22A, 22B, or between these surfaces and the equipment and contents during bag making is reduced, thereby further enhancing the effect of preventing appearance defects due to resistance during bag making and deterioration of the functionality of the zipper tape due to adhesion of contents.

[0022] Figures 4 to 9 also show yet another example of a tape according to an embodiment of the present invention. In Figure 4, an example similar to that in Figure 2, namely, an example in which the first resin portion 201A completely covers the portion of the base other than the engaging portion 21A on the surface on the engaging portion side (first surface), is schematically illustrated for the first tape 20A only. In Figures 4 to 9, only the first tape 20A is schematically illustrated, but the second tape 20B can be configured in the same way. In addition, in the examples of Figures 4 to 9, it is possible to configure the first resin portion 201A to partially cover the surface on the engaging portion side of the base, similar to the example in Figure 1. Furthermore, in the examples of Figures 4 to 9, it is possible to form a projection protruding from the first resin portion 201A, similar to the example in Figure 3.

[0023] In the example shown in Figure 5, the first resin portion 201A includes a portion that covers the engagement-side surface (first surface) of the base portion 22A and a portion that is continuous with this portion and covers the end surface of the base portion 22A. By covering the end surface of the base portion 22A with the first resin portion 201A, a larger surface area of ​​the base portion 22A is covered by the first resin portion 201A, and the effect of suppressing surface stickiness can be obtained.

[0024] In the example shown in Figure 6, the engaging portion 21A includes a core portion 212A made of a second resin portion 202A and a portion 211A covering the core made of a first resin portion 201A. In the example shown in Figure 7, the entire engaging portion 21A is made of the first resin portion 201A. By making the surface of the engaging portion 21A of the first resin portion 201A, the effect of suppressing surface stickiness can be enhanced.

[0025] In other examples, the entire engaging portion 21A is composed of the second resin portion 202A. However, since the area in which the engaging portion 21A contacts the equipment and contents during bag-making is relatively small, even with such a configuration, if the engaging portion side surface (first surface) of the base portion 22A is covered with the first resin portion 201A, the effect of suppressing surface stickiness can be obtained, and the biomass resin content can be increased.

[0026] In the examples shown in Figures 8 and 9, the first resin portion 201A includes a portion that covers the surface of the base portion 22A on the engagement side (first surface) and the end surface, as well as a portion that covers the surface of the base portion 22A opposite to the engagement portion (second surface). These portions may be continuous in cross-sectional shape as shown in the illustrated examples, or they may be separated from each other. By having the first resin portion 201A cover the second surface, problems caused by stickiness during processes such as the transport process before attaching the tape 20 to the container body can be prevented.

[0027] In addition, while Figures 8 and 9 show an example in which the surface of the engaging portion 21A is composed of the first resin portion 201A, similar to the examples in Figures 6 and 7, it is also possible to cover the second surface of the base portion 22A with the first resin portion 201A even when the entire engaging portion 21A is composed of the second resin portion 202A, as in other examples.

[0028] Next, embodiments of the present invention will be described. As shown in the table below, as an embodiment, a tape with a three-layer structure consisting of a surface layer (the first resin portion in the above description), a core portion (the second resin portion), and a seal layer (the third resin portion) was prepared. As a comparative example, a tape with a substantially two-layer structure in which the surface layer is made of the same resin composition as the core layer was prepared. In the table, "PE" means polyethylene derived from fossil fuels, and "BioPE" means biopolyethylene. The tapes of each embodiment and comparative example were stored for eight months, including the summer months (June to September), and the stickiness of the surface was evaluated by touch. Furthermore, the tapes of each embodiment and comparative example were processed into bags using the "BH-60HV" three-side press seal automatic bag-making machine manufactured by Totani Giken Kogyo Co., Ltd., and the occurrence of wrinkles in the tape seal portion was checked. Using PET#12 / LL#50 as the laminate film, bag making was performed using the tapes of each example and comparative example under the following conditions: sealing time 0.4 seconds, acceleration 0.6G, waiting time 0 seconds, feed length 160 mm, and sealing temperature 135°C on the upper side and 130°C on the lower side. For the evaluation of stickiness and wrinkles in the made bags, a tape in which the surface layer, core layer, and sealing layer were all made of polyethylene derived from fossil fuels was used as the standard product. If the stickiness and wrinkles in the made bags were equivalent to the standard product, it was considered OK; if the stickiness was stronger or the wrinkles were more than the standard product, it was considered NG. As a result, in the example in which the surface layer was made of polyethylene derived from fossil fuels, both the surface stickiness and the wrinkles in the made bags were equivalent to the standard product. In contrast, in the comparative example in which the surface layer was made of a resin composition mainly composed of biopolyethylene, the same as the core part, the surface stickiness was stronger than the standard product, and the wrinkles in the made bags were also more than the standard product.

[0029] [Table 1] [Explanation of Symbols]

[0030] 1...Container with tape, 10...Film, 20...Tape, 20A...First tape, 20B...Second tape, 21A,21B...Engaging part, 22A,22B...Base, 23A,23B...Protrusion, 111A...First surface, 111B...Second surface, 201A,201B...First resin part, 202A,202B...Second resin part, 203A,203B...Third resin part, 211A...Part covering the core of the engaging part, 212A...Core part of the engaging part.

Claims

1. A tape whose cross-sectional shape includes an engaging portion and a base portion having a first surface on which the engaging portion protrudes and a second surface on the opposite side of the engaging portion, A first resin portion is formed from a first resin composition mainly composed of resin derived from fossil fuels, and the first resin portion covers at least partially the first surface in the cross-sectional shape, A tape comprising a second resin portion formed from a second resin composition mainly composed of biomass resin, the second resin portion constituting the portion other than the first resin portion.

2. The tape according to claim 1, wherein the first resin portion covers the entire portion of the first surface other than the engagement portion.

3. The tape according to claim 1, wherein the first resin portion includes a portion that covers the first surface and a portion that covers the end surface of the base.

4. The tape according to claim 1, wherein the first resin portion further includes a portion that at least partially covers the second surface.

5. The tape according to claim 1, wherein the second resin portion includes a portion that constitutes the entirety of the engaging portion.

6. The second resin portion includes the portion that constitutes the core of the engaging portion, The tape according to claim 1, wherein the first resin portion includes a portion that covers the first surface and a portion that covers the core of the engaging portion.

7. The tape according to claim 1, wherein the first resin portion includes a portion that covers the first surface and a portion that constitutes the entirety of the engaging portion.

8. The tape according to claim 1, wherein the biomass resin includes biopolyethylene.

9. The tape according to claim 1, wherein the resin derived from fossil fuels includes polyethylene.

10. The polyethylene has a density of 900 kg / m³. ３ More than 940kg / m ３ The tape according to claim 9, which is as follows:

11. The tape according to claim 9, wherein the polyethylene has a melt flow rate of 0.5 g / 10 min or more and 15 g / 10 min or less.

12. The tape according to claim 1, wherein the thickness of the portion of the first resin portion that covers the first surface is 10 μm or more.

13. The tape according to claim 1, further comprising a third resin portion that constitutes a sealing layer that at least partially covers the second surface.

14. The tape according to claim 1, wherein the first resin portion includes a portion that covers the first surface and a projection that protrudes from the portion that covers the first surface.

15. A tape according to any one of claims 1 to 14, comprising: a first tape having a cross-sectional shape that includes the engaging portion and the base having a first outer shape; and a second tape having a cross-sectional shape that includes the engaging portion and the base having a second outer shape that is paired with the first outer shape.

16. A container with tape, comprising a container body and the tape described in claim 15, A container with tape, wherein the tape is attached to the container body such that the first surface of the first tape and the first surface of the second tape face each other.

Images