Beverage extraction sheets and beverage extraction bags

Abstract

The present invention provides a beverage extraction sheet and a beverage extraction bag that allow the beverage extraction raw materials contained inside the beverage extraction bag to be clearly visible. [Solution] The beverage extraction sheet 1 of the present invention comprises a film containing polypropylene, with a thickness of 25 μm to 45 μm, and having beverage extraction holes 2 formed therein. The dynamic friction coefficient of the inner surface facing the beverage extraction material side during beverage extraction is set lower than the dynamic friction coefficient of the outer surface facing the opposite side of the beverage extraction material during beverage extraction. By setting the dynamic friction coefficient of the inner surface of the beverage extraction bag lower than that of the outer surface of the beverage extraction bag, the beverage extraction material becomes more slippery against the inner surface of the beverage extraction bag, allowing the beverage extraction material to oscillate well, resulting in good beverage extraction. Furthermore, it is possible to prevent the beverage extraction bag from unnecessarily sliding inside the outer bag and to suppress the spillage of beverage extraction material from the beverage extraction bag.

Description

Technical Field

[0001] This invention relates to a beverage extraction sheet and a bag for beverage extraction.

Background Art

[0002] It is known to use a sheet in which holes are formed in a film mainly made of a plant-derived biomass as a material for a bag for beverage extraction (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Depending on the type of beverage extraction raw material and the bag for beverage extraction, there may be a case where it is desired to clearly show the beverage extraction raw material contained in the bag for beverage extraction. Also, while smoothly rocking the beverage extraction raw material in the bag for beverage extraction, when the bag for beverage extraction is housed in an outer bag or the like, it may be desirable to keep it from moving as much as possible inside the outer bag. Therefore, the present invention provides a beverage extraction sheet and a bag for beverage extraction that can clearly visualize the inside of the bag for beverage extraction, suppress the dynamic friction coefficient of the inner surface of the bag for beverage extraction, and provide a dynamic friction coefficient on the outer surface of the bag.

Means for Solving the Problems

[0005] The beverage extraction sheet of this invention comprises a film containing polypropylene, having a thickness of 35 μm or more and 45 μm or less, and having beverage extraction holes formed therein. The dynamic friction coefficient of the inner surface facing the beverage extraction raw material side during beverage extraction (hereinafter simply referred to as "the inner surface of the beverage extraction sheet" in this specification) is set lower than the dynamic friction coefficient of the outer surface facing the opposite side of the beverage extraction raw material during beverage extraction (hereinafter simply referred to as "the outer surface of the beverage extraction sheet" in this specification). This configuration allows for the formation of beverage extraction bags using highly transparent beverage extraction sheets. Furthermore, by setting the dynamic friction coefficient of the inner surface of the beverage extraction sheet lower than that of the outer surface, the beverage extraction material slides more easily against the inner surface of the beverage extraction bag, allowing for good agitation of the beverage extraction material within the bag, while also preventing the beverage extraction bags from unnecessarily sliding against each other within the outer bag.

[0006] The beverage extraction sheet of the present invention may have an average pore diameter of 400 μm or more and 650 μm or less for the beverage extraction holes, and the pore opening ratio of the beverage extraction holes may be 3% or more and 5% or less. This configuration allows for good extractability of beverage extraction materials and strength of the beverage extraction sheet.

[0007] The beverage extraction bag of this invention is formed into a bag body capable of containing beverage extraction raw materials using the beverage extraction sheet described in claim 1 or 2.

[0008] The beverage extraction bag of this invention may have the beverage extraction raw material contained inside the bag body. With this configuration, the beverage extraction material is contained inside a highly transparent beverage extraction bag, allowing for clear visualization of the beverage extraction material inside the bag.

[0009] The beverage extraction bag of this invention may be a bag to which a tag and a hanging thread having a thread portion are attached. This configuration allows the user to dispense beverages while the beverage extraction bag is suspended. [Effects of the Invention]

[0010] According to this invention, it is possible to provide a beverage extraction sheet and a beverage extraction bag that allow the inside of the beverage extraction bag to be clearly visible. Furthermore, by setting the dynamic friction coefficient of the inner surface of the beverage extraction bag lower than that of the outer surface of the beverage extraction bag, the beverage extraction material becomes easier to slide against the inner surface of the beverage extraction bag, allowing the beverage extraction material to agitate well, thus resulting in good beverage extraction. In addition, it is possible to prevent the beverage extraction bag from sliding unnecessarily inside the outer bag and suppress the spillage of beverage extraction material from the beverage extraction bag. [Brief explanation of the drawing]

[0011] [Figure 1] This is a conceptual diagram showing one embodiment of a beverage extraction sheet according to an embodiment of the present invention. [Figure 2] This is a perspective view showing one embodiment of a beverage extraction bag according to an embodiment of the present invention. [Figure 3] This is a perspective view showing one embodiment of a beverage extraction bag to which a suspension thread according to an embodiment of the present invention is attached. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 conceptually shows one embodiment of the beverage extraction sheet 1 used in the beverage extraction bag of the present invention.

[0013] As shown in the figure, the beverage extraction sheet 1 is formed in a rectangular shape with dimensions that allow for the formation of one beverage extraction bag.

[0014] The beverage extraction sheet 1 is made of film-like polypropylene. Although not particularly limited, the beverage extraction sheet 1 is formed using a biaxially stretched polypropylene film produced by stretching polypropylene in the biaxial directions of length and width. As a result, the beverage extraction sheet 1 has high transparency.

[0015] The thickness of the beverage extraction sheet 1 is set, for example, in the range of 25 μm or more to 45 μm or less. By setting the thickness in this way, the beverage extraction sheet 1 has appropriate extraction performance and strength as a beverage extraction sheet.

[0016] In the beverage extraction sheet 1, when forming a bag body as the beverage extraction bag described later, the dynamic friction coefficient of the surface on the inner side of the bag body (that is, the inner surface or the surface facing the beverage extraction raw material side) is set to be lower than the dynamic friction coefficient of the surface on the outer side of the bag body (that is, the outer surface or the surface facing the opposite side of the beverage extraction raw material).

[0017] The dynamic friction coefficient of the outer surface of the beverage extraction sheet 1 is not limited, but in the measurement conforming to JIS K 7125, it may be 0.34 or more and 0.41 or less, more preferably 0.35 or more and 0.40 or less, and most preferably 0.36 or more and 0.39 or less.

[0018] Also, the dynamic friction coefficient of the inner surface of the beverage extraction sheet 1 may be set lower than the outer surface. For example, in the measurement conforming to JIS K 7125, it may be 0.21 or more and 0.26 or less, more preferably 0.22 or more and 0.25 or less, and even more preferably 0.23 or more and 0.24 or less.

[0019] The diameter of the beverage extraction hole 2 is set, for example, in the range of an average of 40 μm or more to 650 μm or less. By setting the diameter of the beverage extraction hole 2 in this way, the beverage extraction sheet 1 has appropriate extraction performance.

[0020] Also, the aperture ratio of the beverage extraction sheet 1 is set within a range of, for example, 3% or more to 5% or less. By setting the aperture ratio in this way, the beverage extraction sheet 1 maintains an appropriate tensile strength and keeps the workability during bag body manufacturing good.

[0021] Figure 2 shows an embodiment of the beverage extraction bag 3 of the present invention. In the figure, the beverage extraction holes 2 formed in the beverage extraction sheet 1 are not shown.

[0022] As shown in Figure 2, the beverage extraction bag 3 is formed by making the beverage extraction sheet 1 into a bag shape while containing a beverage extraction raw material (not shown) inside. The beverage extraction bag 3 is formed in a tetra shape with four triangular faces.

[0023] Figure 3 shows an embodiment of the beverage extraction bag 3 (the beverage extraction raw material is not shown) provided with the suspension thread 4. As shown in the figure, the beverage extraction bag 1 has the suspension thread 4 attached to the tetra-shaped bag body.

[0024] The suspension thread 4 includes a thread part 5 and a tag 6. One end of the thread part 5 is attached to a predetermined position of the beverage extraction bag 3. A tag 6 is attached to the other end of the thread part 5.

[0025] The material of the thread part 5 is not particularly limited, but resin or cotton etc. is used. The material of the tag 6 is not particularly limited, but paper or resin etc. is used.

[0026] Since a film-like polypropylene (polypropylene film) is used for the beverage extraction sheet 1 of the present invention, it can have high transparency. Therefore, the beverage extraction bag 3 formed using the beverage extraction sheet 1 can clearly show the beverage extraction raw material contained inside to the outside.

[0027] Furthermore, since polypropylene film does not easily release a film odor even when immersed in hot water, it does not interfere with the flavor of the beverage extracted from the beverage extraction bag 3. Therefore, the beverage extraction sheet 1 or beverage extraction bag 3 of the present invention can be suitably used as a bag for extracting beverages such as Japanese tea or black tea, or broth such as bonito flakes. Furthermore, since polypropylene film can be obtained at low cost, it becomes possible to keep the price of the product, such as the beverage extraction bag 3, down.

[0028] The beverage extraction sheet 1 shown in Figure 1 and the beverage extraction bag 3 shown in Figures 2 and 3 of the present invention have the side of the beverage extraction sheet 1 with the lower dynamic friction coefficient as the inner surface. By setting the dynamic friction coefficient in this way, the inner surface of the beverage extraction bag 3 becomes as smooth as possible, making it less likely for the beverage extraction material to get stuck on the inner surface of the beverage extraction bag 3. As a result, when the beverage extraction bag 3 is immersed in hot water, the beverage extraction material can be moved around well inside, resulting in good extraction performance.

[0029] On the other hand, the beverage extraction bag 3 has the side of the beverage extraction sheet 1 with a higher dynamic friction coefficient facing outwards. Therefore, when the beverage extraction bag 3 is placed inside the outer bag, it is suppressed from moving unnecessarily within the outer bag, and this has the effect of preventing even a small amount of the beverage extraction material inside the beverage extraction bag 3 from spilling.

[0030] Furthermore, the thickness of the beverage extraction sheet 1, the dynamic friction coefficients of the inner and outer surfaces of the beverage extraction sheet 1, etc., may be set to values ​​outside the range described above. Furthermore, the porosity of the beverage extraction holes 2 formed in the beverage extraction sheet 1 may be set to a value outside the range described above. In addition, the combinations of elements that determine the porosity of the beverage extraction holes 2, such as the diameter, pitch, and arrangement of the beverage extraction holes 2, may be changed as appropriate.

[0031] The transparency of the beverage extraction sheet 1, which is made of polypropylene, may be set appropriately within a range that allows the beverage extraction raw materials contained in the beverage extraction bag 3 to be seen with the required clarity.

[0032] The shape of the beverage extraction bag 3 is not limited to the tetrahedron shape shown in Figures 2 and 3, but may be, for example, a rectangular or other polygonal flattened shape or a polyhedron. Furthermore, the shape of the beverage extraction sheet 1 corresponding to the formation of one beverage extraction bag 3 may be appropriately changed depending on the shape of the beverage extraction bag 3 and the folding method used to form that shape. [Explanation of Symbols]

[0033] 1. Beverage extraction sheet 2 Beverage extraction hole 3. Beverage extraction bags 4. Suspension thread 5. Thread part 6 tags

Claims

1. The device comprises a film containing polypropylene, with a thickness of 25 μm or more and 45 μm or less, and having beverage extraction holes formed therein. A beverage extraction sheet in which the dynamic friction coefficient of the inner surface facing the beverage extraction material during beverage extraction is lower than the dynamic friction coefficient of the outer surface facing the opposite side of the beverage extraction material during beverage extraction.

2. The beverage extraction sheet according to claim 1, wherein the average pore diameter of the beverage extraction holes is 400 μm or more and 650 μm or less, and the pore ratio of the beverage extraction holes is 3% or more and 5% or less.

3. A beverage extraction bag formed into a bag body capable of containing beverage extraction raw materials using the beverage extraction sheet described in claim 1 or 2.

4. The beverage extraction bag according to claim 3, wherein the beverage extraction raw material is contained inside the bag body.

5. The beverage extraction bag according to claim 4, wherein a hanging thread having a tag and a thread portion is attached to the bag body.

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