Engagement means and bag body with engagement means

Abstract

One problem addressed by the present invention is to provide an engagement means which has a simple structure, which makes a sound during engagement and disengagement, thereby making it easy for opening and closing to be recognized, has an excellent feeling upon opening, and which does not readily lose engagement strength even when repeatedly opened and closed. Provided is an engagement means comprising a first engaging member provided with a male-side engaging portion provided along a longitudinal direction on a surface of a strip-shaped first base material, and a second engaging member provided with a female-side engaging portion that is provided along the longitudinal direction on a surface of a strip-shaped second base material and that engages detachably with the male-side engaging portion, wherein: a plurality of low parts that are squashed in the height direction of the female-side engaging portion so as to have a reduced height and an increased width are formed in the female-side engaging portion, spaced apart in the longitudinal direction of the female-side engaging portion; and a plurality of cuts in a direction intersecting the longitudinal direction are formed in the male-side engaging portion, spaced apart at intervals of 0.3 to 30 mm in the longitudinal direction of the male-side engaging portion.

Description

Fitting and bag with fitting

[0001] This application claims priority from Japanese Patent Application No. 2024-053577, filed on March 28, 2024, the contents of which are incorporated herein by reference.

[0002] Bags with fittings, in which a fitting that seals the opening of a bag body and allows it to be opened and closed is attached to the inner surface of the bag body near the opening, are widely used in various fields such as food, medicine, and miscellaneous goods. Examples of fittings include a first fitting member having a male fitting portion provided along the longitudinal direction on the surface of a strip-shaped base material, and a second fitting member having a female fitting portion provided along the longitudinal direction on the surface of a strip-shaped base material.

[0003] In such a bag with a fitting, the opening formed in the bag body can be freely closed by attaching and detaching the male fitting portion and the female fitting portion. However, when mating or releasing the male fitting portion and the female fitting portion attached to the bag body, it can be difficult to tell whether the male fitting portion and the female fitting portion are engaged. Therefore, technology has been proposed that makes it easier to recognize the engaged state by the tactile sensation or sound when mating or releasing the male fitting portion and the female fitting portion.

[0004] Patent Document 1 discloses a fitting in which the female fitting portion is provided with a plurality of low portions spaced apart in the longitudinal direction to form steps, so that the engagement of the male fitting portion with the female fitting portion is transmitted to the fingers as a tactile sensation and also produces a popping sound. Patent Document 2 discloses a fitting in which the hook-retaining convex portion (head) of the male fitting portion is provided with an uneven tactile portion consisting of non-recessed and recessed portions arranged alternately along the longitudinal direction, so that the engagement of the male fitting portion with the female fitting portion is transmitted to the fingers as a tactile sensation and also produces a sound due to the recessed portions of the uneven tactile portion when the fitting is completed.

[0005] JP 2017-221627 A JP 2018-008728 A

[0006] However, the fitting device of Patent Document 1 does not consider the sound that occurs when the male fitting portion and the female fitting portion are released from each other. Furthermore, the fitting device of Patent Document 2 requires the latching protrusion (head) to have minute recesses and non-recesses alternately, resulting in a complex design and structure of the male fitting portion. Furthermore, the latching protrusion has chips, which makes it less durable, and repeated opening and closing can easily reduce the fitting strength.

[0007] The main object of the present invention is to provide a fitting device that has a simple structure, makes a sound when engaging and disengaging, making it easy to recognize whether it is open or closed, is comfortable to open, and whose fitting strength does not decrease even when it is opened and closed repeatedly, and a bag body with a fitting device that is equipped with the fitting device.

[0008] The present invention includes the following aspects: [1] A fitting comprising a pair of belt-shaped first and second fitting members, wherein the first fitting member comprises a belt-shaped first base material and a male fitting portion provided longitudinally on the surface of the first base material, and the second fitting member comprises a belt-shaped second base material and a female fitting portion provided longitudinally on the surface of the second base material and adapted to detachably fit with the male fitting portion, wherein the female fitting portion has a plurality of lower portions formed at intervals along the length of the female fitting portion that are compressed in the height direction of the female fitting portion to reduce its height and increase its width, and wherein the male fitting portion has a plurality of notches formed in the length direction of the male fitting portion at intervals of 0.3 mm to 30 mm in a direction intersecting the longitudinal direction. [2] The fitting according to [1], wherein, when the environmental noise measured under the following measurement conditions is A (dB), the disengagement sound when disengaging the male fitting portion from the female fitting portion is B (dB), and the fitting sound when engaging the male fitting portion with the female fitting portion is C (dB), the following conditions are satisfied: |B| - |A| > 10 and |C| - |A| > 10. (Measurement conditions) The male fitting portion and the female fitting portion are engaged and disengaged at a speed of 40 m / min, and the disengagement sound and the engaging sound are measured with a sound level meter positioned 10 cm away from the fitting. [3] A bag body with a fitting comprising the fitting according to [1] or [2].

[0009] According to the present invention, a fitting device that makes a sound when engaging and disengaging, making it easy to recognize whether it is open or closed, that is comfortable to open, and whose fitting strength does not decrease even when repeatedly opened and closed, and a bag body with a fitting device that is equipped with the fitting device can be provided.

[0010] 1 is a perspective view schematically showing a fitting according to an example embodiment; FIG. 2 is a cross-sectional view schematically showing a state in which a male fitting portion and a female fitting portion of a fitting according to an example embodiment are fitted together; FIG. 3 is a perspective view showing a first fitting member of the fitting of FIG. 1; FIG. 4 is a view of the first fitting member of FIG. 3 as seen from the male fitting portion side; FIG. 5 is a view explaining the depth of the notch in the male fitting portion; FIG. 6 is a view explaining the dimensions of the male fitting portion and the female fitting portion; FIG. 7 is a cross-sectional view schematically showing a state in which the male fitting portion and a lower portion of the female fitting portion are fitted together; FIG. 1 is a view of the second fitting member of FIG. 1 as seen from the female fitting portion side; FIG. 2 is a front view schematically showing a bag with fitting according to an example embodiment; FIG. 3 is a perspective view schematically showing a state in which the opening of the bag with fitting of FIG. 4 has been opened; FIG. 4 is an explanatory view schematically showing a state in which a disengagement sound is measured; FIG. 5 is an explanatory view schematically showing a state in which a fitting sound is measured. 13A and 13B are diagrams showing a fitting jig used for measuring fitting noise, in which FIG. 13A is a perspective view and FIG. 13B is a side view.

[0011] Hereinafter, a fitting and a bag with a fitting according to an embodiment will be described with reference to the drawings. The dimensions of the drawings shown in the following description are merely examples, and the present invention is not necessarily limited thereto. The present invention can be implemented by making appropriate changes without departing from the spirit of the present invention. Furthermore, unless otherwise specified, a numerical range expressed using "to" in this specification means a range that includes the numerical values ​​before and after "to" as the lower and upper limits.

[0012] [Fitting Tool] An example of the fitting tool of the present invention will be described in detail below. As shown in Fig. 1, the fitting tool 10 includes a pair of strip-shaped first and second fitting members 12 and 14.

[0013] The first fitting member 12 comprises a strip-shaped first substrate 16 and a male fitting portion 18 provided in the longitudinal direction on a surface 16a of the first substrate 16. The second fitting member 14 comprises a strip-shaped second substrate 20 and a female fitting portion 22 provided in the longitudinal direction on the second substrate 20.

[0014] The male fitting portion 18 comprises a stem 18a rising from the surface 16a of the first substrate 16 and a head 18b provided at the tip of the stem 18a. The head 18b has a larger cross-sectional area in the rising direction of the stem 18a than the stem 18a. The female fitting portion 22 comprises a pair of first and second arms 22a and 22b rising from the surface 20a of the second substrate 20 facing the first substrate 16, with an arc-shaped cross section. The first and second arms 22a and 22b form a recess 22c in the female fitting portion 22 that extends in the longitudinal direction of the second substrate 20.

[0015] 2, in fitting device 10, head 18b of male fitting portion 18 fits into recess 22c of female fitting portion 22, thereby detachably fitting male fitting portion 18 and female fitting portion 22. The shapes of male fitting portion 18 and female fitting portion 22 may be any shape that allows detachable fitting of male fitting portion 18 and female fitting portion 22, and any known shape may be used.

[0016] (First substrate) The first substrate 16 may be a single layer or a multi-layer. An example of a multi-layer first substrate 16 includes a substrate layer and a seal layer provided on the substrate layer opposite the male fitting portion 18.

[0017] Examples of materials for the base layer include linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), polypropylene, polyester-based resins, ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMMA), ethylene-α-olefin copolymers, and propylene-α-olefin copolymers. Among these, LLDPE, LDPE, and polypropylene are preferred in terms of engagement strength and durability. These materials may be used alone or in combination of two or more. The material for the sealing layer is not particularly limited, and examples include LDPE, LLDPE, polypropylene, ethylene-(meth)acrylic acid alkyl ester copolymers, ethylene-α-olefin copolymers, olefin-based elastomers, styrene-based elastomers, acid-modified olefin-based resins, ethylene-vinyl acetate copolymers, ionomers, and polyester-based resins. Among these, LLDPE and LDPE are preferred in terms of flexibility and low-temperature sealing properties. These materials may be used alone or in combination of two or more.

[0018] The multi-layer first substrate 16 may have an intermediate layer between the substrate layer and the seal layer. The material constituting the intermediate layer is not particularly limited, and any material used for the substrate of known fittings can be used. Examples include polyethylene such as LDPE, LLDPE, high density polyethylene (HDPE), ethylene-α-olefin copolymer, polypropylene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, polyester resin (polyethylene terephthalate, polyethylene naphthalate, etc.), polyamide resin (nylon, etc.), etc. Since the fitting has sufficient rigidity, polypropylene or a resin with a density of 930 kg / m ３ The above resins are preferred, and HDPE is particularly preferred. These may be used alone or in combination of two or more.

[0019] The first substrate 16 may contain known additives such as stabilizers, antioxidants, lubricants, antistatic agents, and colorants, as needed.

[0020] The width of the first substrate 16 is preferably 2 mm or more, more preferably 3 mm or more, because sufficient seal strength is easily obtained when heat-sealed to the bag body. The width of the first substrate 16 is preferably 60 mm or less, more preferably 40 mm or less, because it is highly flexible, easy to handle, and less likely to cause deformation of the fitting during distribution and storage. The lower and upper limits of the width of the first substrate 16 can be arbitrarily combined, and for example, a range of 2 to 40 mm is preferable.

[0021] The thickness of the first substrate 16 is preferably 0.10 mm or more, and more preferably 0.12 mm or more, because sufficient seal strength is easily obtained when heat-sealed to the bag body. The thickness of the first substrate 16 is preferably 0.40 mm or less, and more preferably 0.30 mm or less, because it is highly flexible and easy to handle. The lower and upper limits of the thickness of the first substrate 16 can be arbitrarily combined, and for example, a range of 0.10 to 0.40 mm is preferable.

[0022] (Male Fitting Portion) As shown in Figures 3 and 4, the male fitting portion 18 has multiple notches 19 formed at intervals along the length of the male fitting portion 18 and extending in a direction intersecting the longitudinal direction. The formation of multiple notches 19 in the male fitting portion 18 produces a mating sound when the male fitting portion 18 and the female fitting portion 22 are mated, and a disengagement sound when the male fitting portion 18 and the female fitting portion 22 are disengaged. As a result, the opening and closing of the bag body to which the fitting device 10 is attached can be easily recognized by the sound. Furthermore, the notches 19 are transmitted to the fingers as a tactile sensation when the male fitting portion and the female fitting portion are mated and disengaged, making it easy to recognize the opening and closing, and providing a comfortable opening experience. The notches 19 can be formed, for example, by making an incision in the male fitting portion 18 with a blade or the like. The notch 19 prevents the mating portion between the male mating portion 18 and the female mating portion 22 from being chipped, ensuring sufficient mating strength, and the mating strength is less likely to decrease even when the connector is repeatedly opened and closed.

[0023] 4, when first fitting member 12 is viewed from the male fitting portion 18 side, the direction of incision 19 is perpendicular to the longitudinal direction of male fitting portion 18. However, this is not limiting, and the direction of incision 19 may be inclined with respect to the longitudinal direction of male fitting portion 18.

[0024] The spacing D1 between the incisions 19 in the longitudinal direction of the male mating portion 18 is 0.3 mm or more, preferably 0.5 mm or more, and more preferably 0.7 mm or more. If the spacing D1 between the incisions 19 is equal to or greater than the lower limit, the mating strength is less likely to decrease even when the male mating portion 18 and the female mating portion 22 are repeatedly mated and disengaged. Furthermore, the incisions 19 do not become too fine, making them easy to process. On the other hand, if the spacing D1 is less than the lower limit, processing the incisions becomes difficult. The spacing D1 between the incisions 19 in the longitudinal direction of the male mating portion 18 is 30 mm or less, preferably 20 mm or less, and more preferably 10 mm or less. If the spacing D1 between the incisions 19 is equal to or less than the upper limit, a sufficient number of incisions 19 is likely to be secured, shortening the intervals between mating and disengagement sounds between the male mating portion 18 and the female mating portion 22, making it easier to recognize opening and closing by sound. Furthermore, when the male fitting portion and the female fitting portion are mated, the distance at which the slits 19 are felt by the fingers is shortened, making it easier to recognize whether the slits are open or closed, and opening the slits feels more comfortable. The preferred lower and upper limits of the distance D1 between the slits 19 can be arbitrarily combined. The distance D1 between the slits 19 is 0.3 to 30 mm, for example, preferably 0.5 to 20 mm, and more preferably 0.7 to 10 mm.

[0025] The notch 19 is formed from the tip of the head 18b of the male fitting portion 18 in the height direction toward the first substrate 16. As described above, when forming the notch 19 by making an incision in the male fitting portion 18 with a blade or the like, the blade used is preferably wedge-shaped, pointed toward the tip. More specifically, the blade used is preferably pyramidal, with a triangular cross section. Even more specifically, when viewed in cross section in the longitudinal direction of the first substrate 16, the angle of the blade edge entering the first substrate 16 is preferably 30 degrees or less, and the length of the blade edge is preferably 2.0 mm or more. In particular, the blade edge angle is more preferably 25 degrees or less. As shown in FIG. 5 , the depth of the notch 19 is defined as a (mm), the distance from the boundary between the stem 18a and the head 18b in the height direction of the male fitting portion 18 to the tip of the head 18b is defined as b (mm), and the height of the male fitting portion 18, i.e., the distance from the surface 16a of the first substrate 16 to the tip of the head 18b, is defined as c (mm). In this case, it is preferable that b≦a≦c be satisfied, and it is even more preferable that b+(c−b) / 2≦a≦c be satisfied. If the depth a of the notch 19 is b or greater, the mating and disengagement sounds of the male mating portion 18 and the female mating portion 22 become louder, making it easier to recognize the opening and closing by sound. Furthermore, the sensation transmitted to the fingers when the male mating portion and the female mating portion are mated and disengaged becomes stronger, making it easier to recognize the opening and closing, and providing a more comfortable opening experience. When a=c, i.e., when the notch 19 is formed all the way to the base of the trunk 18a of the male mating portion 18, the mating and disengagement sounds of the male mating portion 18 and the female mating portion 22 become the loudest, and the sensation transmitted to the fingers is also the strongest, making this particularly preferable.

[0026] The notches 19 in the longitudinal direction of the male fitting portion 18 may be formed at equal intervals, at intervals that vary in a specific pattern, or at random intervals, as long as the interval D1 is satisfied. The number of notches 19 formed in the male fitting portion 18 is not particularly limited and is determined based on the length of the first fitting member 12 and the interval D1 between the notches 19. For example, the number of notches 19 is preferably approximately 0.1N to 1.4N, and more preferably approximately 0.5N to 1.0N, per opening width N (mm) (the width of the bag excluding the side seal portion). Furthermore, since sound is generated at appropriate intervals, it is preferable for each bag to have at least 10 notches.

[0027] The claw height H1 (FIG. 6) of the male fitting portion 18 is preferably 0.80 mm or more, more preferably 0.85 mm or more, and even more preferably 0.90 mm or more, to facilitate easy fitting and unfitting operations. Furthermore, the claw height H1 of the male fitting portion 18 is preferably 1.35 mm or less, more preferably 1.30 mm or less, and even more preferably 1.25 mm or less, to improve the loading efficiency when the fitting-equipped bag is packed in a box such as cardboard and transported. The preferred lower and upper limits of the claw height H1 of the male fitting portion 18 can be arbitrarily combined, with 0.80 to 1.35 mm being preferred, for example.

[0028] The claw width W1 (Figure 6) of the male fitting portion 18 is preferably 0.55 mm or more, more preferably 0.60 mm or more, and even more preferably 0.65 mm or more, to ensure sufficient mating strength. Furthermore, the claw width W1 of the male fitting portion 18 is preferably 1.00 mm or less, more preferably 0.80 mm or less, and even more preferably 0.77 mm or less, to facilitate easy disengagement and reduce resin costs. The preferred lower and upper limits of the claw width W1 of the male fitting portion 18 can be arbitrarily combined, with 0.55 to 1.00 mm being preferred, for example.

[0029] The shape of male mating portion 18 may be any known shape as long as it can mate with female mating portion 22. The material of male mating portion 18 is not particularly limited, and for example, the same materials as those listed for the base layer of first base material 16 can be used.

[0030] (Second substrate) The second substrate 20 may be a single layer or a multi-layer. An example of a multi-layer second substrate 20 includes a substrate layer and a seal layer provided on the opposite side of the substrate layer from the female fitting portion 22. The multi-layer second substrate 20 may have an intermediate layer between the substrate layer and the seal layer.

[0031] Examples of materials constituting the second substrate 20 include the same materials as those exemplified for the first substrate 16. As materials constituting the second substrate 20, one type may be used alone, or two or more types may be used in combination. The second substrate 20 may contain known additives such as stabilizers, antioxidants, lubricants, antistatic agents, and colorants, as necessary.

[0032] The preferred width and thickness of the second substrate 20 are similar to the preferred width and thickness of the first substrate 16 .

[0033] 1, the female fitting portion 22 has a plurality of low portions 24 formed at intervals along the length of the female fitting portion 22. The low portions 24 are compressed in the height direction of the female fitting portion 22 to reduce the height and increase the width. In this way, the female fitting portion 22 has a plurality of steps formed along the length by the formation of the plurality of low portions 24.

[0034] In addition to the formation of multiple notches 19 in male fitting portion 18, the formation of multiple low portions 24 in female fitting portion 22 makes the sounds of mating and disengaging between male fitting portion 18 and female fitting portion 22 louder. Furthermore, when mating male fitting portion 18 and female fitting portion 22, the feeling transmitted to the fingers as they grasp and slide the portion of the bag to which fitting device 10 is attached becomes stronger when they overcome notches 19 in male fitting portion 18 and steps in female fitting portion 22. Therefore, the combination of these configurations makes it easier to recognize the opening and closing of the bag by sound and feel, resulting in a more comfortable opening experience.

[0035] As shown in Figure 7, when the male mating portion 18 and the female mating portion 22 are mated, the head 18b of the male mating portion 18 fits into the recess 22c of the female mating portion 22, even at the lower portion 24 of the female mating portion 22. This configuration ensures sufficient mating strength while making it easy to recognize opening and closing by sound and feel, thereby improving the ease of opening. Furthermore, even when liquid or powdery contents are placed inside a bag using the fitting 10, the contents are prevented from leaking through the area where the lower portion 24 of the female mating portion 22 is located.

[0036] The ratio of the height of the second arm portion 22b in the low portion 24 to the height of the second arm portion 22b (the arm portion that is positioned on the content side when attached to the bag body) in the non-low portion 26 of the female fitting portion 22 is preferably 7 / 10 or more, more preferably 15 / 20 or more. The ratio is preferably 9 / 10 or less, more preferably 17 / 20 or less. The lower and upper limits of the ratio can be arbitrarily combined. For example, the ratio is preferably 7 / 10 to 9 / 10, more preferably 15 / 20 to 17 / 20. If the ratio is equal to or greater than the lower limit, the fitting strength E (described below) is high. Ａ This makes it easy to ensure sufficient clearance, and even when liquid or powder contents are placed inside a bag using the fitting 10, leakage of the contents through the portion where the low portion 24 of the female fitting portion 22 is located is easily suppressed. If the ratio is equal to or less than the upper limit, the feeling transmitted to the fingers when the male fitting portion and the female fitting portion are mated becomes stronger, and the mating and disengagement sounds also become louder, making it easier to recognize the opening and closing of the bag by feel and sound, and improving the comfort of opening. The same applies to the ratio of the height of the first arm portion 22a at the low portion 24 to the height of the first arm portion 22a (the arm portion that is positioned on the opening side when attached to the bag body) at the non-low portion 26 of the female fitting portion 22.

[0037] The spacing D2 ( FIG. 8 ) between the low-position portions 24 in the longitudinal direction of the female mating portion 22 is preferably 1.0 mm or more, more preferably 1.5 mm or more, and even more preferably 2.0 mm or more. If the spacing D2 between the low-position portions 24 is equal to or greater than the lower limit, the mating strength is less likely to decrease even when the male mating portion 18 and the female mating portion 22 are repeatedly mated and disengaged, and processing is easy. The spacing D2 between the low-position portions 24 in the longitudinal direction of the female mating portion 22 is preferably 20 mm or less, more preferably 10 mm or less, and even more preferably 5.0 mm or less. If the spacing D2 between the low-position portions 24 is equal to or less than the upper limit, a sufficient number of low-position portions 24 is likely to be secured, the intervals between mating and disengagement sounds between the male mating portion 18 and the female mating portion 22 are shortened, and opening and closing can be easily recognized by sound. Furthermore, when the male fitting portion and the female fitting portion are mated, the distance at which the step of the lower portion 24 is felt by the finger is shortened, making it easier to recognize whether the connector is open or closed. The preferred lower and upper limits of the distance D2 between the lower portions 24 can be combined arbitrarily. The distance D2 between the lower portions 24 is preferably 1.0 to 20 mm, more preferably 1.5 to 10 mm, and even more preferably 2.0 to 5.0 mm, for example.

[0038] The longitudinal length L1 (FIG. 8) of the lower portion 24 of the female mating portion 22 is preferably 0.4 mm or more, more preferably 0.6 mm or more, and even more preferably 0.8 mm or more. If the length L1 of the lower portion 24 is equal to or greater than the lower limit, the area of ​​each lower portion increases, making it easier to recognize opening and closing by sound. Furthermore, when the male mating portion and the female mating portion are mated, the step of the lower portion 24 makes it easier to recognize opening and closing with the fingers. The longitudinal length L1 of the lower portion 24 of the female mating portion 22 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less. If the length L1 of the lower portion 24 is equal to or less than the upper limit, the mating strength is less likely to decrease even with repeated mating and unmating, and the low portion can be easily formed. The preferred lower and upper limits of the length L1 of the lower portion 24 can be combined arbitrarily. The length L1 of the lower portion 24 is, for example, preferably 0.4 to 10 mm, more preferably 0.6 to 5 mm, and even more preferably 0.8 to 3 mm.

[0039] The claw height H2 (FIG. 6) of the female fitting portion 22 is preferably 1.10 mm or more, more preferably 1.20 mm or more, and even more preferably 1.25 mm or more, because this facilitates easy fitting and disengagement. Furthermore, the claw height H2 of the female fitting portion 22 is preferably 1.80 mm or less, more preferably 1.75 mm or less, and even more preferably 1.60 mm or less, because this improves the loading efficiency when the fitting-equipped bag body is packed in a box such as cardboard and transported. The preferred lower and upper limits of the claw height H2 of the female fitting portion 22 can be arbitrarily combined; for example, 1.10 to 1.80 mm is preferred, 1.20 to 1.75 mm is more preferred, and 1.25 to 1.60 mm is even more preferred.

[0040] The claw width W2 (FIG. 6) of the female fitting portion 22 is preferably 1.20 mm or more, more preferably 1.25 mm or more, and even more preferably 1.30 mm or more, from the viewpoint of ease of disengagement. The claw width W2 of the female fitting portion 22 is preferably 1.70 mm or less, more preferably 1.65 mm or less, and even more preferably 1.60 mm or less, from the viewpoint of sufficient fitting strength and reducing resin costs. The preferred lower and upper limits of the claw width W2 of the female fitting portion 22 can be arbitrarily combined; for example, 1.20 to 1.70 mm is preferred, 1.25 to 1.65 mm is more preferred, and 1.30 to 1.60 mm is even more preferred.

[0041] The shape of the female fitting portion 22 may be any shape that allows the opening of the bag body to be repeatedly opened and closed by attaching and detaching the male fitting portion 18 and the female fitting portion 22 to and from each other, except for the formation of the lower portion 24. The material of the female fitting portion 22 is not particularly limited, and for example, the same materials as those listed for the base material layer of the first base material 16 can be used.

[0042] The position of the notch 19 in the length direction of the male fitting portion 18 and the position of the lower portion 24 in the length direction of the female fitting portion 22 may be aligned or offset. To maximize the effects of the notch 19 and the lower portion 24, it is preferable to offset the position of the notch 19 in the length direction of the male fitting portion 18 from the position of the lower portion 24 in the length direction of the female fitting portion 22.

[0043] Similar to the male mating portion 18, the female mating portion 22 may have multiple notches formed at intervals along the length of the female mating portion 22 and extending in a direction intersecting the longitudinal direction. By forming multiple notches in the female mating portion 22, the sound of the male mating portion 18 and the female mating portion 22 disengaging from each other becomes louder, making it easier to recognize that the male mating portion 18 and the female mating portion 22 have disengaged. The notches 19 are formed from the tip of the arm in the height direction of the female mating portion 22 toward the second substrate 20, and it is preferable that the depth of the notches extend from the tip of the arm to the surface 20a of the second substrate 20.

[0044] When multiple notches are made in the female mating portion 22, the spacing between the notches in the longitudinal direction is preferably set within the same range as the spacing D1 between the notches 19 in the male mating portion 18. When multiple notches are made in the female mating portion 22, the notches may be made in the low-position portion 24 or the non-low-position portion 26. Furthermore, the position of the notches 19 in the longitudinal direction of the male mating portion 18 and the position of the notches in the longitudinal direction of the female mating portion 22 may be coincident or offset. To maximize the effects of the notches 19 and the low-position portion 24, it is preferable to offset the position of the notches 19 in the longitudinal direction of the male mating portion 18 from the positions of the low-position portion 24 and the notches in the longitudinal direction of the female mating portion 22.

[0045] (Mating and Unmating Sounds) When the environmental sound measured under the measurement conditions described below is A (dB), the unmating sound when the male mating portion 18 and the female mating portion 22 are released is B (dB), and the mating sound when the male mating portion 18 and the female mating portion 22 are mated is C (dB), it is preferable that the fitting device 10 satisfy |B| - |A| > 10 and |C| - |A| > 10. This makes it easy to recognize that a bag with the fitting device 10 attached has been opened by the sound of the male mating portion 18 and the female mating portion 22 disengaging from each other. Note that |A|, |B|, and |C| indicate the absolute values ​​of the respective measured sounds.

[0046] <Measurement conditions> The environmental noise is measured with a sound level meter standing on a desk, and further, with the distance from the center of the microphone to the fitting device 10 set to 10 cm, a pinch roll (a drive roll for running a long material) is used to perform fitting and unfitting operations between the male fitting portion 18 and the female fitting portion 22 at a speed of 40 m / min, and the unfitting sound and fitting sound are measured. The measurement method will be described later.

[0047] Since the disengagement sound makes it easy to recognize that the male fitting portion 18 and the female fitting portion 22 have been disengaged, the value of |B|-|A| is preferably greater than 10, more preferably greater than 15, and more preferably greater than 20. The larger the value of |B|-|A|, the better, and there is no particular upper limit.

[0048] Since it becomes easy to recognize the mating sound between male mating portion 18 and female mating portion 22, the value of |C|-|A| is preferably greater than 10, more preferably greater than 13, and more preferably greater than 15. The larger the value of |C|-|A|, the better, and there is no particular upper limit.

[0049] (Fitting strength) The fitting strength E between the male fitting portion 18 and the female fitting portion 22 on the side that is arranged on the content side of the bag body is Ａ is preferably more than 25N, and more preferably more than 30N. Ａ If the strength of the fitting is equal to or greater than the lower limit, the fitting between the male fitting portion 18 and the female fitting portion 22 is easily maintained even if pressure is applied from the contents side. Ａ If there are multiple fitting parts, the average value is used. Ａ There is no particular upper limit to the rate of change in fitting strength, and the higher the better. The rate of change in fitting strength Q (%) of the side of the bag that is located on the content side relative to the initial fitting strength after 100 repeated fitting and disengagement operations of the fitting device is preferably -20% or more, more preferably -15% or more, and even more preferably -10% or more. There is no particular upper limit to the rate of change in fitting strength, and the higher the rate, the better the fitting strength on the content side can be maintained even after repeated opening and closing. When there are multiple fitting portions, the rate of change in fitting strength Q (%) is taken as an average value.

[0050] In addition, the fitting strength E ＡThe maximum stress is measured by cutting out a 50 mm long sample, clamping the side of the substrate of the sample that will be placed on the bag content side between the upper and lower chucks of a tensile tester, and pulling at a chuck distance of 60 mm and a pulling speed of 50 mm / min. Since the chuck distance is longer than the width of the substrate, a film-laminated paper is welded to the substrate to extend the substrate in the width direction, and the film-laminated paper is clamped between the chucks according to the chuck distance. Ａ This can be adjusted by adjusting the shape of the head of the male fitting portion and the shape of the second arm portion at the non-lower position of the female fitting portion.

[0051] The fitting strength E between the male fitting portion 18 and the female fitting portion 22 on the side that is located on the opening side of the bag body Ｂ is preferably more than 7N, and more preferably more than 10N. Ｂ If the strength is equal to or greater than the lower limit, the bag is prevented from accidentally opening. Ｂ In case of multiple fitting parts, the average value is used. Also, the fitting strength E Ｂ is preferably 40N or less, and more preferably 25N or less.

[0052] The rate of change in fitting strength Q (%) of the fitting strength on the side of the bag that is located on the opening side after 100 repeated fitting and disengagement operations of the fitting tool relative to the initial fitting strength is preferably -20% or more, preferably -15% or more, and more preferably -10% or more. There is no particular upper limit to the rate of change in fitting strength, and the higher the rate, the better the fitting strength on the opening side can be maintained even after repeated opening and closing. When there are multiple fitting portions, the rate of change in fitting strength Q (%) is taken as an average value.

[0053] In addition, the fitting strength E Ｂ The fitting strength E is the maximum value of the stress when a 50 mm long sample is cut out, the side edge of the substrate of the sample that is located on the opening side of the bag is clamped between the upper and lower chucks of a tensile tester, and pulled at a chuck distance of 60 mm and a pulling speed of 50 mm / min. In addition, since the chuck distance is longer than the width of the substrate, a film-laminated paper is welded to the substrate to extend the substrate in the width direction, and the film-laminated paper is clamped between the chucks according to the chuck distance. ＢThis can be adjusted by adjusting the shape of the head of the male fitting portion and the shape of the second arm portion at the non-lower position of the female fitting portion.

[0054] (Method of Manufacturing Fitting) The method of manufacturing the fitting 10 of the present invention is not particularly limited. Examples of methods for manufacturing the first fitting member 12 include a method in which a resin material for forming the first fitting member 12 is prepared by melt-kneading or the like, and molded by extrusion molding or the like, and then multiple incisions 19 are formed in the male fitting portion 18 with a blade or the like. Examples of methods for manufacturing the second fitting member 14 include a method in which a resin material for forming the second fitting member 14 is prepared by melt-kneading or the like, and extruded by extrusion molding or the like, and then the female fitting portion 22 is partially crushed with an embossing roll, bar, or the like to form multiple lower portions 24. When incisions are also formed in the female fitting portion 22, examples of the method include a method in which the lower portions 24 are formed and then the incisions are formed in the female fitting portion 22 with a blade.

[0055] Examples of a method for mixing materials include dry mixing using a super mixer, a Henschel mixer, etc. Examples of a melt-kneading method include feeding raw materials to a melt-kneader such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader, a mixing roll, etc. Examples of a molding method include extrusion molding, injection molding, inflation molding, vacuum molding, etc.

[0056] In the fitting device 10 of the present invention described above, multiple notches 19 are formed at predetermined intervals in the male fitting portion 18 and multiple low portions 24 are formed in the female fitting portion 22, so that the disengagement of the male fitting portion 18 and the female fitting portion 22 can be easily recognized by sound and touch, providing a comfortable opening experience. Furthermore, when fitting, the engagement of the male fitting portion 18 and the female fitting portion 22 can be easily recognized by sound and touch. Furthermore, the structure is simple, and the fitting strength of the fitting device 10 is not likely to decrease even with repeated opening and closing.

[0057] [Bag with fitting] The bag with fitting according to the embodiment is a bag equipped with the fitting according to the embodiment, i.e., a bag in which the fitting according to the embodiment is attached to the inner surface of the opening of the bag body that contains the contents. The bag with fitting according to the embodiment can adopt any known aspect other than being equipped with the fitting according to the embodiment. Below, a description is given of one example of the bag with fitting according to the embodiment.

[0058] 9 is a front view of a bag with a fitting according to an example embodiment. As shown in FIG. 9, the bag with a fitting 1 (hereinafter simply referred to as "bag 1") of this embodiment includes a bag body 40 that contains contents, and a fitting 10 attached to the inner surface of the upper part of the bag body 40.

[0059] The bag body 40 is formed by overlapping a first film material 42 and a second film material 44 and heat-sealing their entire peripheral edges 46 to form a sealed bag. The fitting 10 is attached by welding the outer surface 16b of the first base material 16 and the outer surface 20b of the second base material 20 to the first film material 42 and the second film material 44, respectively. A cutting assist line 48 may be provided in the bag body 40 above the fitting 10, running horizontally, and a notch 50 may be formed at the end of the line.

[0060] In this embodiment, the shape of the bag body 40 is rectangular. However, the shape of the bag body 40 is not limited to a rectangle. The size of the bag body 40 is also not particularly limited, and may be selected appropriately depending on the contents to be accommodated in the bag body 40.

[0061] The first film material 42 and the second film material 44 may be any material that can weld the fitting 10 by heat sealing, and are preferably laminated films having at least a sealant layer and a base layer from the inner side.

[0062] Examples of resins constituting the base layer of the laminate film include linear low-density polyethylene, low-density polyethylene, high-density polyethylene, polyester, biaxially oriented nylon, and biaxially oriented polypropylene. Examples of resins constituting the sealant layer of the laminate film include linear low-density polyethylene, low-density polyethylene, unoriented polypropylene, ethylene-vinyl acetate copolymer, and ionomer. The laminate film may be provided with a functional layer such as a barrier layer. Furthermore, from an environmentally friendly perspective, a synthetic resin may be mixed with cellulose. Furthermore, the first film material 42 and the second film material 44 may be single-layer films.

[0063] The bag body 40 has a cutting assist line 48 formed along the fitting 10 above the fitting 10. The cutting assist line 48 is a linear portion processed to assist in cutting the bag body 40. Examples of the cutting assist line 48 include weakened lines formed in the first film material 42 and the second film material 44 at the portion of the cutting assist line 48. The weakened line can be formed by providing a portion of the film material that is thinner than the surrounding area. Alternatively, the weakened line can be formed by perforations or rows of small holes. The cutting assist line 48 is not limited to a weakened line and may be a line formed by printing or the like that indicates the position to cut with scissors, a cutter, or the like.

[0064] A notch 50 is formed at the end of the cutting assist line 48 in the peripheral edge portion 46. The shape of the notch 50 is not particularly limited, and a triangular or semicircular cutout can be used. Alternatively, the notch 50 may be a cut provided in the peripheral edge portion 46.

[0065] 10 is a schematic perspective view showing the opened bag 1. The bag 1 can be opened by cutting and removing the upper portion of the bag body 40 from the notch 50 along the cutting assist line 48, forming an opening 52 in the upper portion. The opening 52 formed in the bag 1 can be repeatedly opened and closed by attaching and detaching the first fitting member 12 and the second fitting member 14 of the fitting 10.

[0066] The above-described bag with fitting 1 of the present invention is equipped with the fitting 10 of the present invention, and therefore, since the male fitting portion 18 is formed with a plurality of incisions 19 at predetermined intervals and the female fitting portion 22 is formed with a plurality of low portions 24, the disengagement of the male fitting portion 18 and the female fitting portion 20 can be easily recognized by sound and touch, and the bag is easy to open. Furthermore, when fitting, the engagement of the male fitting portion 18 and the female fitting portion 20 can be easily recognized by sound and touch. Furthermore, even when the bag is repeatedly opened and closed, the fitting strength of the fitting 10 is not easily reduced, and leakage of liquid or powdery contents can be prevented even when the bag is filled with such contents.

[0067] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. The shapes and combinations of the components shown in the above examples are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0068] 1 to 8 has only one pair of male fitting portion 18 and female fitting portion 22, but the present invention is not limited to this, and a fitting may have two or more pairs of male fitting portion 18 and female fitting portion 22 arranged parallel to each other on first substrate 16 and second substrate 20. For example, in the case of a fitting having a first male fitting portion and a first female fitting portion that detachably fit with each other, and a second male fitting portion and a second female fitting portion that detachably fit with each other, the first male fitting portion and the second male fitting portion may be arranged parallel to each other on the first substrate, and the first female fitting portion and the second female fitting portion may be arranged parallel to each other on the second substrate, or the first male fitting portion and the second female fitting portion may be arranged parallel to each other on the first substrate, and the first female fitting portion and the second male fitting portion may be arranged parallel to each other on the second substrate.

[0069] The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following descriptions.

[0070] [Measurement of disengagement sound and engagement sound] A sound level meter (Ono Sokki Co., Ltd., "Standard Sound Level Meter LA-1240") was set to frequency characteristic A and dynamic characteristic FAST, and disengagement sound B (dB) and engagement sound C (dB) were measured under the following conditions: Fig. 11 shows how disengagement sound B was measured, Fig. 12 shows how engagement sound C was measured, and Fig. 13 shows the engagement jig used to measure the engagement sound.

[0071] <Measurement Conditions for Unmating Sound B> 1. Preliminary Stage: A pinch roll (a drive roll for running a long material), consisting of two rubber rolls arranged above and below, was rotated at a speed of 40 m / min. A sound level meter was placed upright on a desk 5 m away from the pinch roll. The height of the sound level meter's microphone was adjusted to be the same as the height of the contact surface between the upper and lower pinch rolls. 2. Preparation of Measurement Sample: A 1.5 m fitting was prepared as the measurement sample and was pre-peeled to leave a 1 m separation and a 50 cm mated portion. The tip of the separated male fitting was then connected to a 10 m extension fitting. The extension fitting was made of the same base material width as the fitting to be measured and had no notches. The tip of the male fitting and the extension fitting were connected by stapling the connection and then fixing with PP tape (adhesive tape). Note that the fixing method is not particularly limited as long as the tip of the fitting and the extension fitting do not separate. As shown in Figure 11, the tip of the peeled female mating part was fixed in the direction opposite the pinch roll, and the point where the mating part began to peel (the boundary between the peeled part and the mated part) was positioned 10 cm in front of the sound level meter microphone. At this time, the height of the position where the mating part was wound around the pinch roll, the peeled part of the male mating part, the mating start point (the boundary between the peeled part and the mated part), and the peeled part of the female mating part were all at the same height, and the tip of the male mating part peeled from the mating start point and the tip of the peeled female mating part were tensioned so as not to loosen. 3. Measurement: The extension mating part connected to the male mating member was sandwiched between the upper and lower pinch rolls while they were rotating, and the mated part of the measurement sample peeled as the pinch rolls rotated. The sound volume generated during this process was measured with a sound level meter.

[0072] <Measurement Conditions for Interlocking Sound C> 1. Preliminary Stage: A pinch roll (a drive roll for running a long material), consisting of two rubber rolls arranged above and below, was rotated at a speed of 40 m / min. A sound level meter was placed upright on a desk 5 m away from the pinch roll. The height of the sound level meter's microphone was adjusted to be the same as the height of the contact surface between the upper and lower pinch rolls. 2. Preparation of Measurement Sample: A 1.5 m interlocking tool was prepared as a measurement sample, and the interlocking portion (interlocking allowance) was 1 m and the separation portion was 50 cm. As shown in Figure 12, the interlocking portion was passed through an interlocking tool with a gap (approximately 0.3 mm higher than the interlocking height) large enough for the interlocking tool to pass through in the interlocked state, and a 10 m extension interlocking tool was attached to the end of the jig. The extension fitting was made of a material with the same base width as the fitting member to be measured and no cuts or slits. The end of the mated portion and the extension fitting were connected with staples and then secured with PP tape (adhesive tape). Note that the securing method is not particularly limited as long as the end of the fitting member and the extension fitting cannot be separated. The peeled portion was positioned on the opposite side of the fitting jig from the pinch roll. The point where the mating began after passing through the fitting jig was positioned 10 cm in front of the sound level meter microphone. 3. Measurement: The extension fitting connected to the mated portion of the measurement sample was sandwiched between the rotating upper and lower pinch rolls. As the pinch rolls rotated, the peeled portion of the measurement sample passed through the fitting jig and mated. The sound volume generated during this process was measured with the sound level meter. The fitting jig is self-standing, as shown in Figures 13(A) and 13(B). The rear plate can be raised or lowered depending on the thickness of the measurement sample, and the height of the gap through which the measurement sample passes can be adjusted by fastening it with a rear screw. 13(B) shows a state where there is no gap, but by raising the back plate and fixing it with screws, a gap is created and the height can be adjusted. The gap is set to a height about 0.3 mm higher than the mating height, which is the thickness of the mating tool when the male mating part and female mating part of the measurement sample are mated, and the peeled part will be mated when it passes through the mating jig. If the gap height is too wide, mating will not occur even after passing through the mating jig, and if it is too narrow, friction noise will be loud and accurate measurement will not be possible.

[0073] Environmental sound A, mating / unmating sound B, and mating sound C were each measured three times, and the average of the absolute values ​​was used. Mating / unmating sound B and mating sound C were evaluated using the following evaluation criteria. Furthermore, if there was no difference in the volume between the environmental sound and the measured sound and the generated sound could not be measured, the measured sound and the environmental sound were assigned the same value. <Evaluation criteria> ◯: |B|-|A|>10 or |C|-|A|>10, the mating and unmating sounds were loud, and the opening and closing of the bag could be felt from the generated sounds. △: 10≧|B|-|A|≧5 or 10≧|C|-|A|≧5, the mating and unmating sounds were slightly quiet, and the opening and closing of the bag was difficult to hear from the generated sounds. ×: |B|-|A|<5 or |C|-|A|<5, the mating and unmating sounds were so quiet that they were barely audible.

[0074] [Evaluation of opening ease] For each fitting device, fitting and unfitting operations were performed, and the opening ease was evaluated based on the feel with the fingers and the sound heard, using the following criteria: ◎: Feelable with the fingers, and loud sounds generated at regular intervals, making it easy to feel the bag opening and closing. ◯: Feelable with the fingers, and sounds generated at regular intervals, making it easy to feel the bag opening and closing. ×: Sound was weak, or the intervals between sounds were long, making it difficult to feel the opening ease.

[0075] [Measurement of Fitting Strength After Repeated Opening and Closing] A 50 mm long sample was cut from the fitting obtained in each example, and the initial fitting strength E0 (N) was measured using a tensile tester "Strograph" manufactured by Toyo Seiki Seisakusho, Ltd., with a chuck distance of 60 mm and a test speed of 50 mm / min. When measuring the fitting strength on the content side, the side end of the base material of the sample located on the content side of the bag body was clamped between the upper and lower chucks of the tensile tester, and the maximum stress was measured when pulled at a tensile speed of 50 mm / min. When measuring the fitting strength on the opening side, the side end located on the opening side was clamped between the upper and lower chucks of the tensile tester, and the maximum stress was measured when pulled at a tensile speed of 50 mm / min. In addition, when there are multiple fitting portions, the tensile tester was temporarily stopped to detect load reduction each time one fitting was released, and the fitting strength at each fitting portion was measured, and the average value was taken as the fitting strength. Since the width of the base material of the fitting tool was shorter than the distance between the chucks of the tensile tester, a film-laminated paper was welded to the base material to extend the base material in the width direction, and the film-laminated paper was clamped by the chucks according to the distance between the chucks. After the fitting tool was repeatedly engaged and disengaged 100 times, a 50 mm long sample was cut out and the fitting strength E1 (N) was measured again under the same conditions. From the obtained fitting strengths E0 and E1, the rate of change Q (%) of fitting strength after repeated opening and closing was calculated using the following formula: Q = {(E1 - E0) / E0} x 100

[0076] Example 1: Linear low-density polyethylene (LLDPE) was used as the resin constituting the first substrate, second substrate, male mating portion, and female mating portion. The fittings shown in Figures 1 to 8 were manufactured by extrusion molding using a composite profile die. The thickness of the first and second substrates was 0.15 mm and the width was 10 mm. The male mating portion had a claw height of 1.3 mm and a claw width of 0.9 mm, and the female mating portion had a claw height of 1.4 mm and a claw width of 1.6 mm. The extruded fitting was water-cooled while the female mating portion was partially crushed with an embossing roll to form multiple low-position portions spaced apart in the longitudinal direction. The length of the low-position portions in the longitudinal direction was 0.95 mm, the spacing between the low-position portions was 3.7 mm, and the ratio of the arm height of the low-position portion to the arm height of the non-low-position portion of the female mating portion was 16 / 20. Furthermore, a blade was used to make multiple notches perpendicular to the longitudinal direction at intervals along the length of the male fitting portion of the resulting fitting. The notches were spaced 1.6 mm apart along the length of the male fitting portion. The depth of the notches 19 was 100% (a = c) of the claw height of the male fitting portion 18.

[0077] Example 2 A fitting was manufactured in the same manner as in Example 1, except that a blade was used to make multiple incisions perpendicular to the longitudinal direction at intervals in the longitudinal direction for the female fitting portion. The incisions were made in the longitudinal direction of the female fitting portion to a depth from the tip of the arm to the surface 20a of the second substrate 20, and the incisions were spaced apart 1.6 mm apart.

[0078] Example 3 A fitting was manufactured in the same manner as in Example 3, except that the interval between the notches in the male fitting portion was set to 0.8 mm.

[0079] Comparative Example 1 A fitting was produced in the same manner as in Example 1, except that no cut was formed in the male fitting portion.

[0080] Comparative Example 2 A fitting was manufactured in the same manner as in Example 1, except that no notch was formed in the male fitting portion and no lower portion was formed in the female fitting portion.

[0081] Comparative Example 3 A fitting was manufactured in the same manner as in Example 1, except that the interval between the notches formed in the male fitting portion was set to 40 mm.

[0082] Example 4 A fitting was manufactured in the same manner as in Example 1, except that it had three parallel sets of male fitting portions and female fitting portions, with two sets of male fitting portions being provided on the surface of the first base material and the remaining set of male fitting portions between the two sets being provided on the surface of the second base material, by forming multiple notches in each male fitting portion and multiple low portions in each female fitting portion.

[0083] Comparative Example 4 A fitting was produced in the same manner as in Example 4, except that no cut was formed in the male fitting portion.

[0084] Table 1 shows the conditions and evaluation results for each fitting example.

[0085]

[0086] As shown in Table 1, the fittings of Examples 1 to 3, in which multiple notches were formed at specific intervals in the male fitting portion and multiple low-position portions were formed in the female fitting portion, produced louder fitting and disengagement sounds, made it easier to recognize the engagement and disengagement of the male and female fitting portions, and provided a good opening experience compared to Comparative Example 1, in which no notches were formed in the male fitting portion, and Comparative Example 2, in which neither notches nor low-position portions were formed in the male fitting portion. Furthermore, the fittings of Examples 1 to 3 produced sounds at regular intervals when the bag was opened and closed, providing a superior opening experience compared to the fitting of Comparative Example 3, in which the notches in the male fitting portion were spaced farther apart. It was found that the fitting of Comparative Example 3 had too wide a spacing between the notches, resulting in a long interval between sounds, which resulted in a poor opening experience. Furthermore, in Examples 1 to 3, after 100 cycles of mating and unmating, the mating strength change rate (%) on the content side and the mating strength change rate (%) on the opening side were both higher than -10%, and the mating strength was maintained.

[0087] Furthermore, the fitting device of Example 4, in which multiple notches were formed at specific intervals in each male fitting portion and multiple low-position portions were formed in each female fitting portion, produced louder fitting and disengagement sounds than the fitting device of Comparative Example 4, in which no notches were formed in each male fitting portion, making it easier to recognize the engagement and disengagement of the male fitting portion and female fitting portion, and also providing a good opening feel.

[0088] According to the present invention, it is possible to provide a fitting device that has a simple structure, makes a sound when engaging and disengaging, making it easy to recognize whether it is open or closed, is comfortable to open, and whose fitting strength does not decrease even when repeatedly opened and closed, and a bag body with a fitting device that is equipped with the fitting device.

[0089] 10 Fitting tool 12 First fitting member 14 Second fitting member 16 First base material 18 Male fitting portion 19 Notch 20 Second base material 22 Female fitting portion 24 Lower portion 26 Non-lower portion 40 Bag body 42 First film material 44 Second film material 48 Cutting assistance line 50 Notch

Claims

1. A fitting device comprising a pair of band-shaped first and second fitting members, wherein the first fitting member comprises a band-shaped first base material and a male fitting portion provided longitudinally on the surface of the first base material, and the second fitting member comprises a band-shaped second base material and a female fitting portion provided longitudinally on the surface of the second base material and adapted to detachably fit with the male fitting portion, wherein the female fitting portion has a plurality of lower portions formed at intervals along the length of the female fitting portion that are compressed in the height direction of the female fitting portion to reduce its height and increase its width, and wherein the male fitting portion has a plurality of notches formed in the length direction of the male fitting portion at intervals of 0.3 mm to 30 mm in the direction intersecting the longitudinal direction.

2. The fitting device according to claim 1, wherein, when the environmental sound measured under the following measurement conditions is A (dB), the disengagement sound when the male fitting portion and the female fitting portion are disengaged is B (dB), and the fitting sound when the male fitting portion and the female fitting portion are fitted together is C (dB), the following conditions are satisfied: |B| - |A| > 10 and |C| - |A| > 10. (Measurement conditions) The male fitting portion and the female fitting portion are fitted and disengaged at a speed of 40 m / min, and the disengagement sound and the fitting sound are measured with a sound level meter positioned 10 cm away from the fitting device.

3. A bag with a fitting comprising the fitting according to claim 1 or 2.

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