Sealing implement and sealing-implement-equipped bag body

Abstract

One problem to be addressed by the present invention is to provide a sealing implement that has a simple structure, makes it easy to recognize seal openings by producing a sound when the seal is released, has a favorable feel when opening, and hardly decreases sealing strength even when repeatedly opened and closed. Provided is a sealing implement comprising: a first sealing member provided with a male-side sealing part provided on the surface of a belt-shaped first base material along the longitudinal direction; and a second sealing member provided on the surface of a belt-shaped second base material along the longitudinal direction and provided with a female-side sealing part detachably sealed to the male-side sealing part. A plurality of notches are formed in the male-side sealing part in a direction intersecting the longitudinal direction spaced out at intervals of 0.3-30 mm in the longitudinal direction of the male-side sealing part. The change rate of the sealing strength, with respect to an initial sealing strength, on the contents side measured after a sealing and a seal release operations of the male-side sealing part and the female-side sealing part are repeated 100 times is -30% or more.

Description

Fitting and bag with fitting

[0001] This application claims priority from Japanese Patent Application No. 2024-053551, 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 mated. Therefore, technology has been proposed that makes it easier to recognize the mated 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 that is simple in structure, makes a sound when the fitting is released, making it easy to recognize that it has been opened, is comfortable to open, and has a fitting strength that is not easily reduced even when repeatedly opened and closed, and a bag body with a fitting that is equipped with the fitting.

[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 male fitting portion has a plurality of notches formed in the male fitting portion in a direction intersecting the longitudinal direction at intervals of 0.3 mm to 30 mm along the length of the male fitting portion, and wherein the rate of change in fitting strength on the content side relative to the initial fitting strength measured after 100 repetitions of fitting and disengaging between the male fitting portion and the female fitting portion is -30% or more. [2] The fitting according to [1], wherein |B| - |A| > 10 is satisfied, where A (dB) is the environmental sound measured under the following measurement conditions, and B (dB) is the disengagement sound when the male fitting portion and the female fitting portion are disengaged. (Measurement conditions) The male fitting portion and the female fitting portion are disengaged at a speed of 40 m / min, and the disengagement sound is measured. [3] A bag body with a fitting comprising the fitting according to [1] or [2].

[0009] According to the present invention, it is possible to provide a fitting that is simple in structure, makes a sound when the fitting is released, making it easy to recognize that it has been opened, is comfortable to open, and has a fitting strength that does not decrease even when repeatedly opened and closed, and a bag body with a fitting that is equipped with the fitting.

[0010] 11(A) is a perspective view schematically showing a fitting according to an example of an embodiment; FIG. 11(B) is a cross-sectional view schematically showing a state in which the male fitting portion and the female fitting portion of the fitting according to an example of an embodiment are fitted together; FIG. 11(C) is a perspective view showing a first fitting member of the fitting of FIG. 1; FIG. 11(D) is a view of the first fitting member of FIG. 3 from the male fitting portion side; FIG. 11(E) is a view illustrating the depth of the notch in the male fitting portion; FIG. 11(F) is a view illustrating the dimensions of the male fitting portion and the female fitting portion; FIG. 11(F) is a front view schematically showing a bag with fitting according to an example of an embodiment; FIG. 11(A) is a perspective view schematically showing the bag with fitting of FIG. 7 after the opening has been opened; FIG. 11(B) is an explanatory view schematically showing the state in which disengagement sound is measured; FIG. 11(C) is an explanatory view schematically showing the state in which fitting sound is measured; and FIG. 11(C) is a view schematically showing a fitting jig used for fitting sound measurement, where FIG. 11(A) is a perspective view and FIG. 11(B) 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, and having 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 multiple notches 19 formed in the male fitting portion 18 generate a disengagement sound when the male fitting portion 18 and the female fitting portion 22 are disengaged from each other. As a result, the opening of the bag to which the fitting device 10 is attached can be easily recognized by the sound. Furthermore, the notches 19 are tactilely transmitted to the fingers when the male fitting portion and the female fitting portion are disengaged, making it easy to recognize the opening and providing a comfortable opening experience. The notches 19 are formed, for example, by making an incision in the male fitting portion 18 with a blade or the like. The notches 19 ensure that the fitting portion between the male fitting portion 18 and the female fitting portion 22 does not break, ensuring sufficient fitting strength and preventing a decrease in fitting strength even with repeated opening and closing.

[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 and female mating portions are disengaged, the intervals between the intermittent impacts transmitted through the slits 19 are shortened, making it easier to recognize whether the lid is open or closed, and more comfortable to open. The preferred lower and upper limits of the spacing D1 of the slits 19 can be combined arbitrarily. The spacing D1 of 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 incision 19 is greater than or equal to b, 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 the opening by the sound. Furthermore, the impact transmitted to the fingers when the male mating portion and the female mating portion are 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 incision 19 is formed all the way to the base of the trunk 18a of the male mating portion 18, the sound of the male mating portion 18 and the female mating portion 22 disengaging from each other is loudest, and the impact transmitted to the fingers is also the strongest, which is 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 intervals satisfy the above-mentioned distance D1. 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 distance 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 be mated with female mating portion 22. There are no particular restrictions on the material of male mating portion 18, and for example, the same materials as those listed for the base material layer of first substrate 16 can be used. Furthermore, by coloring the resin that makes up male mating portion 18, mating and unmating can be sensed visually by touch, sound, and color.

[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] (Female Fitting Portion) The shape of the female fitting portion 22 may be any shape as long as the opening of the bag body can 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.

[0034] 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 1.70 mm is more preferred, and 1.25 to 1.60 mm is even more preferred.

[0035] 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.

[0036] 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 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 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 notch is from the tip of the arm to the surface 20a of the second substrate 20.

[0037] When multiple notches are made in female fitting portion 22, the spacing between the notches in the longitudinal direction is preferably set within the same range as the spacing D1 between notches 19 in male fitting portion 18. When multiple notches are made in female fitting portion 22, the positions of notches 19 in the longitudinal direction of male fitting portion 18 and the positions of notches in the longitudinal direction of female fitting portion 22 may be coincident or offset. To maximize the effects of notches 19 and lower portion 24, it is preferable to offset the positions of notches 19 in the longitudinal direction of male fitting portion 18 from the positions of notches in the longitudinal direction of female fitting portion 22.

[0038] The material of the female fitting portion 22 is not particularly limited, and may be the same as the materials listed for the base material layer of the first base material 16. Furthermore, by coloring the resin that constitutes the female fitting portion 22, the mating and unmating can be sensed visually by touch, sound, and color.

[0039] (Disengagement Sound) When the environmental sound measured under the measurement conditions described below is A (dB) and the disengagement sound when the male mating portion 18 and the female mating portion 22 are disengaged is B (dB), the fitting device 10 preferably satisfies |B| - |A| > 10. This makes it easy to recognize that a bag to which the fitting device 10 is attached has been opened by the disengagement sound between the male mating portion 18 and the female mating portion 22. |A| and |B| indicate the absolute values ​​of the respective measured sounds.

[0040] <Measurement conditions> The environmental noise was 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) was used to perform the mating and unmating operations between the male fitting portion 18 and the female fitting portion 22 at a speed of 40 m / min, and the unmating sound and the mating sound were measured. The measurement method will be described later.

[0041] 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 25. The larger the value of |B|−|A|, the better, and there is no particular upper limit.

[0042] Furthermore, when the mating sound when mating the male mating portion 18 and the female mating portion 22, measured under the same conditions as the mating release sound B, is defined as C (dB), the value of |C| - |A| is preferably greater than 8, more preferably greater than 10, and more preferably greater than 15. The larger the value of |C| - |A|, the easier it is to recognize the mating of the male mating portion 18 and the female mating portion 22 by sound in a bag body to which the fitting device 10 is attached. The larger the value of |C| - |A|, the more preferable, and there is no particular upper limit. Note that |C| indicates the absolute value of the measured sound.

[0043] (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 20N, and more preferably more than 30N. Ａ If the strength of the engagement is equal to or greater than the lower limit, the engagement 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 mating parts, the average value is used. Ａ There is no particular upper limit to the value of E, and the higher the better. In addition, when there are multiple fitting portions and the fitting strength of each pair is different, it is preferable that the fitting strength E exceeds 30N in any pair, and more preferably exceeds 35N. Ａ It is preferable that the lowest fitting set also exceeds 20N.

[0044] The rate of change in the mating strength of the side that is located on the contents side, measured after 100 repeated mating and disengagement operations between the male mating portion 18 and the female mating portion 22 of the fitting device 10, relative to the initial mating strength, is preferably -30% or more, more preferably -20% or more, even more preferably -15% or more, and particularly preferably -13% or more. There is no particular upper limit to the rate of change in mating strength, and the higher the rate, the better the mating strength on the contents side can be maintained even after repeated opening and closing. If there are multiple mating portions, the rate of change in mating strength Q (%) is taken as the average value.

[0045] In addition, the fitting strength E Ａ The fitting strength E is the maximum value of the stress when a 50 mm long sample is cut out, the side of the substrate of the sample that will be placed on the bag content side 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. Ａ This can be adjusted by adjusting the shape of the head of the male fitting portion, the shape of the arm portion of the female fitting portion, the spacing of the notches, etc.

[0046] 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 bodyＢ is preferably more than 6N, and more preferably more than 8N. 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. The rate of change in the mating strength of the side located on the opening side, measured after 100 repeated mating and disengagement operations of the male mating portion 18 and the female mating portion 22 of the fitting device 10, relative to the initial mating strength, is preferably -30% or more, more preferably -20% or more, even more preferably -15% or more, and particularly preferably -13% or more. There is no particular upper limit to the mating strength change rate, and the higher the value, the better the mating strength on the opening side can be maintained even after repeated opening and closing. When there are multiple mating portions, the mating strength change rate Q (%) is taken as the average value.

[0047] In addition, the fitting strength E B The maximum stress is measured by cutting out a 50 mm long sample, clamping the side edge of the substrate of the sample that will be located on the opening side of the bag 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. B This can be adjusted by adjusting the shape of the head of the male fitting portion, the shape of the arm portion of the female fitting portion, the spacing of the notches, etc.

[0048] (Method of Manufacturing Fitting) There are no particular limitations on the method of manufacturing the fitting 10 of the present invention. 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 molded by extrusion molding or the like, and then multiple incisions are formed in the female fitting portion 22 as needed with a blade or the like.

[0049] 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.

[0050] In the fitting device of the present invention described above, multiple notches 19 are formed at predetermined intervals in male fitting portion 18, making it easy to recognize by sound and touch that the male fitting portion 18 and female fitting portion 22 have been disengaged, and opening the fitting device is comfortable. Furthermore, the structure is simple, and the fitting strength of fitting device 10 is not likely to decrease even with repeated opening and closing.

[0051] [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.

[0052] 7 is a front view of a bag with a fitting according to an embodiment. As shown in Fig. 7, 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 8 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.

[0060] The above-described bag with fitting 1 of the present invention is equipped with fitting 10 of the present invention, in which multiple notches 19 are formed at predetermined intervals in male fitting portion 18, and therefore, the disengagement of male fitting portion 18 and female fitting portion 22 can be easily recognized by sound and touch, providing a comfortable opening experience. Furthermore, repeated opening and closing does not weaken the fitting strength of fitting 10, and leakage of liquid or powder contents can be prevented even when the bag is filled with such contents.

[0061] 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.

[0062] 1 to 6 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.

[0063] The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following descriptions.

[0064] [Measurement of unmating and mating sounds] A sound level meter (Ono Sokki Co., Ltd., "Standard Sound Level Meter LA-1240") was set to frequency characteristics A and dynamic characteristics FAST, and unmating sound B (dB) and mating sound C (dB) were measured under the following conditions: Fig. 9 shows how unmating sound B was measured, Fig. 10 shows how mating sound C was measured, and Fig. 11 shows the mating jig used to measure the mating sounds.

[0065] <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 had the same base width as the fitting to be measured and no cuts or nicks. The tip of the male fitting and the extension fitting were connected by stapling the connection and then securing with PP tape (adhesive tape). Note that the method of securing the fitting was not particularly limited as long as the tip of the fitting and the extension fitting could not be separated. As shown in Figure 9, 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.

[0066] <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, and 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 10, 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 the same base material width as the fitting member to be measured, with no 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 tape do not separate. 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 11(A) and 11(B). The height of the gap through which the measurement sample passed could be adjusted by adjusting the rear plate up or down depending on the thickness of the measurement sample and securing it with the rear screw. 11(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.

[0067] 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|≧15 or |C|-|A|≧15, excellent mating and unmating sounds, and the opening and closing of the bag can be felt by the sound regardless of surrounding noise. 〇: 15>B|-|A|>9 or 15>|C|-|A|>10, mating and unmating sounds are loud, and the opening and closing of the bag can be felt by the sound. △: 9≧|B|-|A|≧5 or 10≧|C|-|A|≧5, mating and unmating sounds are slightly quiet, and the opening and closing of the bag is difficult to feel by the sound. ×: |B|−|A|<5 or |C|−|A|<5, and the mating sound and the mating release sound are so small that they are barely audible.

[0068] [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 the sound generated at regular intervals is loud and audible, making it easy to feel the bag opening and closing. ◯: Feelable with the fingers, and the sound generated at regular intervals makes it possible to feel the bag opening and closing. ×: The sound is weak, or the intervals between sounds are long, making it difficult to feel the opening ease.

[0069] [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., at 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 side of the substrate 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 side 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 chuck distance of 60 mm and a tensile speed of 50 mm / min. At this time, since the chuck distance was longer than the width of the substrate, a film-laminated paper was welded to the substrate to extend the substrate in the width direction, and the film-laminated paper was clamped between the chucks according to the chuck distance. Furthermore, when there were multiple fitting portions, the load reduction was detected each time one fitting portion was released, and the tensile tester was temporarily stopped to measure the fitting strength at each fitting portion, and the average value was taken as the fitting strength. 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

[0070] Example 1: Low-density polyethylene (LDPE) 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 13 mm. The male mating portion had a claw height of 1.3 mm and a claw width of 0.7 mm, and the female mating portion had a claw height of 1.5 mm and a claw width of 1.6 mm. A blade was used to make multiple cuts in the male mating portion of the resulting fitting, spaced apart along the longitudinal direction and perpendicular to the longitudinal direction. The spacing between the cuts in the longitudinal direction of the male mating portion was 1.6 mm. The depth of the cuts 19 was 100% (a = c) of the claw height of the male mating portion 18.

[0071] 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.

[0072] 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.

[0073] Example 3 A fitting was manufactured using two parallel sets of male and female fitting portions, one set of male fitting portions on the surface of a first substrate and the other set of male fitting portions on the surface of a second substrate. The first substrate, second substrate, male fitting portion, and female fitting portion were made of linear low-density polyethylene (LLDPE), and the fitting was manufactured by forming multiple incisions in each male fitting portion in the same manner as in Example 1, except that the width of the first substrate and second substrate was 15 mm.

[0074] Example 4 A fitting was manufactured in the same manner as in Example 3, 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.

[0075] Comparative Example 2 A fitting was produced in the same manner as in Example 3, except that no cut was formed in the male fitting portion.

[0076] Comparative Example 3 A fitting was produced in the same manner as in Example 3, except that the interval between the cuts in the longitudinal direction of the male fitting portion was set to 40 mm.

[0077] The conditions and evaluation results for each fitting are shown in Table 1, and the fitting strength and fitting strength change rate (%) for Examples 1 to 4 are shown in Table 2.

[0078]

[0079]

[0080] As shown in Table 1, the fittings of Examples 1 and 2, in which multiple notches were formed at specific intervals on the male fitting portion, produced louder disengagement and engagement sounds, made it easier to recognize the engagement and disengagement of the male and female fitting portions, and provided a comfortable opening experience compared to Comparative Example 1, in which no notches were formed on the male fitting portion. The fittings of Examples 3 and 4, which had two sets of fitting portions and multiple notches formed at specific intervals on each male fitting portion, also produced louder disengagement sounds, made it easier to recognize the disengagement of the male and female fitting portions, and provided a comfortable opening experience compared to the fitting of Comparative Example 2, in which no notches were formed on each male fitting portion. Furthermore, Comparative Example 3, in which the notches on the male fitting portion were spaced widely apart at 40 mm, produced sounds that were too long, resulting in a poor opening experience. The fittings of Examples 1 to 4 also produced louder engagement sounds compared to Comparative Examples 1, 2, and 3, making it easier to recognize the engagement of the male and female fitting portions.

[0081] As shown in Table 2, the fittings of Examples 1 to 4 had an initial fitting strength E Ａ The mating strength change rate measured after 100 cycles of mating and disengaging the male mating part and the female mating part was -15% or more, demonstrating excellent durability. Ａ The mating strength was high at over 8N, and the mating strength change rate measured after 100 repeated mating and disengagement operations of the male mating portion and the female mating portion was -16% or more, demonstrating excellent durability. In Examples 3 and 4, which had two sets of mating portions, the mating strength and mating strength change rate were calculated by averaging the measured values ​​for each set.

[0082] According to the present invention, there is provided a fitting device that has a simple structure, makes a sound when the fitting is released, making it easy to recognize that it has been opened, is comfortable to open, and the 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.

[0083] REFERENCE SIGNS 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 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 male fitting portion has a plurality of notches formed in it in a direction intersecting the longitudinal direction at intervals of 0.3 mm to 30 mm along the length of the male fitting portion, and wherein the fitting strength on the content side measured after the male fitting portion and the female fitting portion are engaged and disengaged 100 times exhibits a change of -30% or more compared to the initial fitting strength.

2. The fitting device according to claim 1, wherein |B| - |A| > 10 is satisfied, where A (dB) is the environmental sound measured under the following measurement conditions, and B (dB) is the disengagement sound when the male fitting portion and the female fitting portion are disengaged. (Measurement conditions) The male fitting portion and the female fitting portion are disengaged at a speed of 40 m / min, and the disengagement sound is measured.

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

Images