WO2012011558A1 - 逆止弁及びその製造方法、並びに、逆止弁を備える容器 - Google Patents
逆止弁及びその製造方法、並びに、逆止弁を備える容器 Download PDFInfo
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- WO2012011558A1 WO2012011558A1 PCT/JP2011/066678 JP2011066678W WO2012011558A1 WO 2012011558 A1 WO2012011558 A1 WO 2012011558A1 JP 2011066678 W JP2011066678 W JP 2011066678W WO 2012011558 A1 WO2012011558 A1 WO 2012011558A1
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- Prior art keywords
- check valve
- main body
- container
- lid
- opening
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/38—Devices for discharging contents
- B65D25/40—Nozzles or spouts
- B65D25/42—Integral or attached nozzles or spouts
- B65D25/46—Hinged, foldable or pivoted nozzles or spouts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/5861—Spouts
- B65D75/5872—Non-integral spouts
- B65D75/5883—Non-integral spouts connected to the package at the sealed junction of two package walls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D47/00—Closures with filling and discharging, or with discharging, devices
- B65D47/04—Closures with discharging devices other than pumps
- B65D47/06—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages
- B65D47/08—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having articulated or hinged closures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D47/00—Closures with filling and discharging, or with discharging, devices
- B65D47/04—Closures with discharging devices other than pumps
- B65D47/20—Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
- B65D47/2018—Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge comprising a valve or like element which is opened or closed by deformation of the container or closure
Definitions
- the present invention relates to a check valve, a manufacturing method thereof, and a container provided with the check valve.
- a so-called vacuum container is known as a container for suppressing the oxidation of the contents (see, for example, Patent Document 1).
- a check valve for preventing air from entering the container is attached to the spout.
- This check valve has a structure in which a cut is provided in the dome-shaped head, and the cut opens when pressure is applied in the direction of dispensing the contents, and conversely closes when pressure is applied in the filling direction. It has become.
- the size of the container spout is designed according to the type and viscosity of the contents, and the check valve should be built into the spout accordingly.
- the size of is determined. For example, when a vacuum container is used as a soy sauce container used at a table and a check valve is provided at the spout, the outer diameter of the check valve is limited to about 10 to 15 mm. In order to produce such a small check valve in large quantities at low cost, integral molding using a mold is suitable.
- the inventors of the present invention prototyped various types of check valves and containers equipped with the same by integral molding, and evaluated the presence or absence of air in the container and the discharge of contents.
- the check valve 50 shown in FIG. 8 finds that when an impact is applied to the container, the lid portion 53 enters the cylindrical main body portion 51, and the lid portion 53 does not sufficiently function as a valve. (See Comparative Example 1).
- a hinge portion 55 shown in FIG. 8 is a portion connecting the main body portion 51 and the lid portion 53.
- the present invention has been made in order to solve the above-described problems, and even when an impact is applied to the container, air can be sufficiently suppressed from being mixed into the container, and the excellent discharge property of the contents can be stably maintained. It is an object of the present invention to provide a check valve that can be maintained at the same time and a container having the check valve. It is another object of the present invention to provide a method for manufacturing a check valve that exhibits the above effects sufficiently efficiently and at low cost.
- the check valve according to the present invention is made of a rubber material and manufactured by integral molding, and has a cylindrical main body portion having openings at both ends, and a lid portion disposed so as to close one opening of the main body portion. And a hinge portion for connecting the main body portion and the lid portion and opening one opening when a force is applied to the lid portion from the main body portion side toward the outside.
- the side surface has a protruding portion that comes into contact with the peripheral edge of one of the openings.
- the check valve is provided with a protrusion on the side surface of the lid, and in a state where one opening of the main body is closed, this protrusion contacts the peripheral edge of the one opening of the main body. Touch.
- the protrusion provided on the side surface of the lid is a portion that becomes a so-called undercut in the molding process.
- a molded body is manufactured by integral molding, if there is an undercut portion, the portion is caught at the time of mold release, and the molded body cannot be properly taken out from the mold, and in some cases, the molded body is damaged.
- the number of parts of the mold is increased so that an undercut portion does not occur, another problem that costs increase is caused.
- the check valve of the present invention can sufficiently avoid problems caused by undercut without using a special mold. That is, since the check valve of the present invention is made of a rubber material having a predetermined hardness and elongation, even if the protruding portion of the lid portion is an undercut portion, it can be properly taken out from the mold. Therefore, the manufacturing cost of the check valve can be kept sufficiently low.
- the hardness of the silicone rubber means a value measured according to JIS K6249
- the elongation means a value measured according to JIS K7127.
- one opening of the main body portion is constituted by a linear portion forming a hinge portion and an arc-shaped portion.
- arc means a part of a circle or a part of an ellipse.
- arcuate portion of the outer diameter R 1 is the opening of the arcuate portion of the lid portion greater than the diameter R 2 of, and the difference between the R 1 and R 2 is 0.06 mm ⁇ 0.50 mm.
- the angle formed between the side surface of the lid portion and the inner surface of the main body portion is more preferably 15 to 25 °. If the rubber material has a hardness of 30 to 80 degrees and an elongation of 200 to 900%, it is easy to obtain a check valve with sufficient mechanical strength without causing problems due to undercut in the manufacturing process. This is further preferable.
- the container according to the present invention includes a container body made of a film and the check valve mounted on the container body. Since this container is provided with the above-described check valve, even if an impact is applied to the container, air can be sufficiently prevented from entering the container. Thereby, it can fully suppress that the contents deteriorate by oxidation. Moreover, since the excellent discharge property of the contents can be stably maintained by the action of the check valve, it can be used for a sufficiently long time without any special work by the user.
- the container according to the present invention further includes a spout loaded with a check valve.
- the liquid discharge port at the tip of the spout has a shape that is once narrowed in the middle and further widened.
- the container according to the present invention at least a part of the main body of the check valve is deformed according to the difference from the atmospheric pressure when the inside of the check valve becomes negative pressure, and the check valve It is preferable to be formed thin enough to reduce the volume.
- the liquid returning to the lower part of the container generates a negative pressure in the upper part of the container.
- the main body portion of the check valve is deformed so as to be recessed by an amount corresponding to the difference from the atmospheric pressure.
- the main body of the check valve has a stepped shape including a small diameter portion and a large diameter portion, and one opening is formed in the small diameter portion.
- the small diameter portion is formed thinner than the large diameter portion.
- the present invention provides a method for manufacturing the check valve. That is, the check valve manufacturing method according to the present invention includes a cylindrical main body having openings at both ends, a lid disposed so as to close one opening of the main body, and the main body and the lid. And a hinge portion for opening one opening when a force is applied to the lid portion from the main body side toward the outside, and the lid portion has a peripheral edge portion of the one opening of the main body portion.
- a method for manufacturing a check valve having a projecting portion on its side surface, and a rubber material having a hardness of 30 to 80 degrees and an elongation of 200 to 900% in a cavity having a recess for forming the projecting portion A molding step for obtaining a molded body comprising: a mold releasing step for taking out the molded body from the cavity; and a cutting step for separating the main body portion and the lid portion while leaving a portion to be a hinge portion.
- the hardness of the rubber material is 30 to 80 degrees and the elongation is 200 to 900%, so that the portion that becomes the protruding portion of the lid portion is sufficiently prevented from being caught in the concave portion of the cavity.
- the molded product can be smoothly taken out from the mold. For this reason, it is not necessary to use a special metal mold, and the manufacturing cost can be kept sufficiently low.
- the check valve according to the present invention By using the check valve according to the present invention, it is possible to sufficiently suppress the mixing of air into the container even when an impact is applied to the container and to stably maintain the excellent discharge property of the contents. . Moreover, according to the check valve manufacturing method according to the present invention, the check valve having the above-described effects can be manufactured sufficiently efficiently and at low cost.
- FIG. 1 is a perspective view showing a preferred embodiment of a check valve according to the present invention.
- (A) And (b) is the top view and sectional drawing of a non-return valve shown in FIG. It is sectional drawing which shows the state which the cover part of the non-return valve shown in FIG. 1 opened. It is a fragmentary sectional view which expands and shows the cover part vicinity of the non-return valve shown in FIG. It is a perspective view which shows the flexible vacuum vessel provided with the non-return valve shown in FIG.
- (A) And (b) is the perspective view and sectional drawing of the exterior body which incorporated the non-return valve shown in FIG. It is a fragmentary sectional view showing other embodiments of a check valve concerning the present invention.
- FIG. 6 is a cross-sectional view showing a check valve according to Comparative Example 1.
- FIG. It is sectional drawing of the exterior body (spout) with which the check valve and this check valve were loaded which show other embodiment of this invention.
- the check valve 10 is made of an elastomer such as a rubber material and is manufactured, for example, by integral molding.
- the check valve 10 includes a cylindrical main body portion 1 having openings 1 a and 1 b at both ends, and a lid portion 3 arranged so as to close the opening 1 a on the distal end side of the main body portion 1.
- the hinge part 5 which connects the main-body part 1 and the cover part 3 is provided.
- the hinge portion 5 has a function of a hinge of the lid portion 3, and when a force F is applied to the lid portion 3 from the main body portion 1 side toward the outside, It has the flexibility to open the opening 1a.
- the main body 1 has a through hole 1c penetrating in the longitudinal direction, and the openings 1a and 1b form both ends of the through hole 1c.
- the inner diameter of the through hole 1c is preferably about 5.0 to 7.0 mm.
- the lower portion of the main body 1 is thick and the upper portion is thin.
- the outer diameter of the lower part (thick part) of the main body 1 is preferably about 12.8 mm, and the outer diameter of the upper part (thin part) is preferably about 7.7 to 10.0 mm.
- a part of the outer surface of the lower portion of the main body 1 is a flat surface 1d, and a protrusion 1e is provided on the flat surface 1d.
- the protrusion 1e functions as a positioning mark when the check valve 10 is fixed to the exterior body 32 (see FIG. 6).
- the opening 1a on the front end side of the main body 1 is composed of a linear part L and an arcuate part R as shown in FIG.
- the linear portion L of the opening 1 a is formed by a raised portion 1 f provided in the vicinity of the opening 1 a in the through hole 1 c of the main body 1, and the linear portion L and the linear portion of the lid portion 3 are continuous.
- the hinge part 5 is comprised by doing. There is an advantage that the manufacturing process can be simplified by making the part other than the part constituting the hinge part into an arc shape. That is, after integral molding, the lid 3 can be separated from the main body 1 while leaving the hinge 5 by a simple method of pressurizing the inside of the main body 1.
- the lid 3 is connected to the main body 1 via the hinge 5 and is disposed so as to close the opening 1 a of the main body 1.
- the lid portion 3 has a protruding portion 3 a on the side surface 3 b that contacts the peripheral edge portion of the opening 1 a of the main body portion 1.
- the height of the protrusion 3a (the length from the side surface 3b of the lid 3 to the tip of the protrusion 3a) is preferably 0.4 to 0.6 mm, more preferably 0.45 to 0.55 mm. . If the height of the protruding portion 3a is less than 0.35 mm, the effect of preventing the lid portion 3 from entering the through-hole 1c tends to be insufficient, and if it exceeds 1.0 mm, problems due to undercuts tend to occur in the manufacturing process. .
- the outer diameter R 1 of the arcuate portion of the lid 3 than the diameter R 2 of arcuate portions R of the opening 1a Is also preferably large.
- the difference between R 1 and R 2 is preferably 0.06 mm to 0.50 mm, and more preferably 0.08 mm to 0.25 mm.
- the lid portion is difficult to enter into the through hole of the main body portion, so that pouring is not hindered.
- the dispensing is not hindered.
- the outside diameter of the lid portion is not constant, for example, when the side surface of the lid portion 3 is tapered as shown in FIG. 2 (b), the maximum outer diameter is R 1.
- the side surface 3b of the lid 3 has a smaller outer diameter from the upper side toward the main body 1 so that the hinge 5 can be formed and the main body 1 and the lid 3 can be efficiently separated in the manufacturing process. It is preferably tapered.
- the angle (angle ⁇ shown in FIG. 4) formed by the side surface 3b of the lid 3 and the inner surface of the main body 1 is preferably 15 to 25 °. If the angle is greater than 15 °, the lid portion is unlikely to enter the through hole of the main body portion, so that the pouring is not hindered. When the angle is smaller than 25 °, the check valve function is more likely to be exhibited, and air mixing is less likely to occur.
- unevenness is imparted to one or both of the contact portions between the main body portion 1 and the lid portion 3 of the check valve 10.
- the surface tension can be lowered, thereby preventing the main body portion 1 and the lid portion 3 from adhering due to the surface tension of the content liquid and making the valve easy to open.
- a filler to a rubber material, more specifically, a rubber material in which a filler is kneaded is used for one or both of the main body portion 1 and the lid portion 3 of the check valve 10. Can be used.
- filler calcined silica fine powder, titanium oxide powder, alumina powder, ground quartz, ground cristobalite, diatomaceous earth powder, aluminosilicate powder, magnesium oxide powder, aluminum hydroxide powder, iron oxide powder, zinc oxide powder, Heavy calcium carbonate powder is mentioned.
- the content of the filler in the rubber material is preferably 1 to 50% by weight, more preferably 5 to 40% by weight.
- the average particle size of the filler is preferably 0.1 to 50 ⁇ m, more preferably 5 to 40 ⁇ m.
- the check valve 10 is made of a rubber material and manufactured by integral molding. Specific examples of the rubber material include silicone rubber and NBR. When the check valve is used in a food container, it is preferable to employ silicone rubber as the rubber material.
- the hardness of the rubber material constituting the check valve 10 is 30 to 80 degrees, preferably 40 to 70 degrees, more preferably 50 to 60 degrees.
- the elongation of the rubber material is 200 to 900%, preferably 300 to 800%, more preferably 400 to 700%. If the hardness of the rubber material is less than 30 degrees or the elongation exceeds 900%, the mechanical strength of the check valve 10 becomes insufficient, while the hardness of the rubber material exceeds 80 degrees or the elongation is less than 200%. In the manufacturing process, problems due to undercuts occur.
- the manufacturing method of the check valve 10 includes (a) a molding step, (b) a cutting step, and (c) a cutting step.
- (A) Molding step This step is for obtaining a molded body made of a rubber material having a hardness of 30 to 80 degrees and an elongation of 200 to 900% in a cavity having a recess for forming the protruding portion 3a. belongs to.
- the processing conditions are set so that the hardness and elongation of the molded body are in the above ranges.
- (B) Mold release process This process is for taking out the molded body from the cavity.
- the molded body is taken out from the cavity by pulling the female mold and the male mold in opposite directions along the longitudinal direction of the molded body.
- the part used as the protrusion part 3a of the non-return valve 10 becomes an undercut, since the rubber material which makes a molded object has the hardness and elongation of the said range, the malfunction resulting from the part of an undercut Can be sufficiently suppressed.
- (C) Cutting process This process is for cutting off the main body 1 and the lid 3 while leaving a portion to be the hinge 5. Since the opening 1a of the main body 1 is composed of a linear portion L and an arc-shaped portion R, when air is supplied to the inside of the molded body to pressurize the inside, stress concentrates on the arc-shaped portion R. Thus, only the arc-shaped portion R can be cut.
- the container 30 includes a container body 31 made of a transparent film having flexibility, an exterior body 32 provided obliquely on a shoulder portion of the container body 31, and a check valve 10 in which the exterior body 32 is built.
- the lid portion 3 is positioned on the distal end side of the exterior body 32, and the hinge portion 5 is in a horizontal direction when the container 30 is stood in a state where the bottom portion of the container 30 is down (state shown in FIG. 5). It is built in such a way that the protruding portion 3a is positioned below the hinge portion 5 and extending.
- the film constituting the container body 31 may be a single layer, but is preferably composed of a plurality of layers.
- the film is composed of a plurality of layers, for example, it is composed of a base material layer that forms an outer layer when processed into a bag shape, a sealant layer that forms an inner layer, and an adhesive layer that bonds the base material layer and the sealant layer together. Is done.
- the exterior body 32 includes a cap attachment portion 32a, a check valve fixing portion 32b provided at the lower portion thereof, and a joint portion 32c provided at the lower portion thereof. Note that the cap is not shown in FIG.
- the outer peripheral surface of the joint portion 32 c and the peripheral edge portion of the container main body 31 are bonded together, and the cap attaching portion 32 a and the check valve fixing portion 32 b are attached so as to protrude out of the container main body 31.
- the exterior body 32 one produced by an injection molding method or the like can be used.
- the material of the exterior body 32 include synthetic resins such as polyethylene and polypropylene.
- the welding of the container body 31 and the joint portion 32c can be performed by heat sealing, high frequency sealing, hot air sealing, microwave heating, ultrasonic sealing, or the like.
- the container 30 includes the check valve 10, even if an impact is applied to the container 30, air can be sufficiently prevented from entering the container 30. Thereby, it can fully suppress that soy sauce deteriorates by oxidation. Moreover, since the excellent discharge property of the contents can be stably maintained by the action of the check valve 10, it can be used for a sufficiently long time without any special work by the user.
- the present invention is not limited to the above-mentioned embodiment.
- the whole side surface 13b of the cover part 13 becomes a taper shape.
- the upper portion may form the protruding portion 13a.
- the protruding portion 13a becomes an undercut portion.
- by using a rubber material having the hardness and elongation in the above range problems caused by the undercut portion can be sufficiently obtained. Can be prevented.
- the shape of the main body of the check valve is not limited to a cylinder, and may be an oval, rectangular or polygonal cylinder in cross section.
- the channel cross section of the through-hole 1c and the shape of the lid are not limited to a substantially circular shape, and may be an ellipse, a rectangle, or a polygon.
- the non-return valve used for the container for soy sauce was demonstrated, the use of the non-return valve and the container of this invention is not limited to soy sauce,
- the non-return valve of this invention You may fill a container provided with liquids, such as a soft drink, an alcoholic beverage, salad oil, or a liquid detergent.
- the liquid discharge port 32d formed at the tip of the exterior body (hereinafter also referred to as spout) 32 has a shape excellent in drainage of liquid such as soy sauce, for example, once constricted in the middle.
- the shape is widened first (see FIG. 9).
- the container 30 is tilted to discharge a necessary amount of soy sauce and the container 30 is returned to the upright state, a part of the soy sauce remains in the liquid discharge port 32d, and the liquid dripping and dirt thereafter. It may cause.
- the container 30 is provided with a suck back mechanism.
- the thinly formed portion is not particularly limited, but in the present embodiment, the main body portion 1 has a stepped shape including the small diameter portion 11 and the large diameter portion 12, and the small diameter portion 11 is acceptable.
- a check valve 10 formed of a peripheral wall thinner than the large-diameter portion 12 is used so as to have flexibility (see FIG. 11 and the like).
- the operation of the suck back mechanism in such a container 30 is as follows. First, when the container 30 is returned from an inclined discharge state to an upright (upright) state, the discharge of soy sauce stops. When the erect state is restored, the lid 3 of the check valve 10 naturally closes due to the elasticity of the elastomer, and the space from the lid 3 of the check valve 10 to the liquid discharge port 32d in the spout 32 (in FIG. 9). , And a space (indicated by reference symbol B in FIG. 9) inside the container 30 relative to the lid portion 3 of the check valve 10 is blocked. At this time, with the soy sauce remaining at the tip of the liquid discharge port 32d (see FIG. 12), when a cap (not shown) is attached to the cap mounting portion 32a of the spout 32, the remaining soy sauce is around the liquid discharge port 32d. It may adhere to and cause dripping.
- the soy sauce that is going to return to the lower portion of the container 30 is subjected to a negative pressure (indicated by symbol P in FIG. Cause it to occur.
- a negative pressure acts in this manner, a part of the main body portion 1 of the check valve 10 (in the case of the present embodiment, the peripheral wall of the small diameter portion 11) is deformed so as to be recessed by an amount corresponding to the difference from the atmospheric pressure ( FIG. 11).
- the space A in the spout 32 (the space from the lid 3 of the check valve 10 to the liquid discharge port 32d) becomes negative pressure, so the tip of the liquid discharge port 32d
- the soy sauce remaining in the container sucks back only the deformed body integral of the check valve 10 (see FIG. 12). After the suck back, even if the cap is attached, soy sauce does not adhere to the periphery of the liquid discharge port 32d, so that dripping does not occur.
- the time required for the user to put on the cap after the container 30 in the discharged state is returned to the upright state is assumed to be 1 to 2 seconds at the earliest. It is sufficient time to suck back the soy sauce remaining in the liquid discharge port 32d in the container 30.
- molded articles were produced as follows. That is, after a silicone rubber raw material was placed in the cavity, the raw material was cured at 175 ° C. for 6 minutes in a cavity constituted by two molds to obtain a molded body. After the molded body was taken out, the protrusion was observed with a microscope, and no damage was observed. All of the silicone rubbers constituting the molded bodies according to Examples 1 to 3 had a hardness of 55 degrees and an elongation of 380%.
- molded articles of Examples 4 and 5 were produced as follows. That is, after a silicone rubber raw material was placed in the cavity, the raw material was cured at 170 ° C. for 135 seconds in a cavity constituted by nine molds to obtain a molded body. After the molded body was taken out, the protrusion was observed with a microscope, and no damage was observed. All of the silicone rubbers constituting the molded bodies according to Examples 4 and 5 had a hardness of 60 degrees and an elongation of 350%.
- Example 1 a plurality of containers according to Example 1 were prepared, and 500 ml of soy sauce was filled in each of them to prepare specimens.
- the performance of the check valve was evaluated in more detail by performing the following test on the specimen.
- SYMBOLS 1 Main-body part, 1a, 1b ... Opening, 3,13 ... Cover part, 3a, 13a ... Projection part, 3b, 13b ... Side surface, 5 ... Hinge part, 10 ... Check valve, 11 ... Small diameter part, 12 ... Large Diameter: 30 ... Flexible vacuum vessel (container), 31 ... Container body, 32 ... Exterior body (spout), 32d ... Liquid discharge port, F ... Force, L ... Linear portion, P ... Negative pressure, R ... Arc shape portion.
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Abstract
Description
図1~4を参照しながら、家庭用の醤油を入れるための容器に内蔵させる逆止弁を例に挙げて説明する。本実施形態に係る逆止弁10は、ゴム材料等のエラストマからなり例えば一体成形によって製造されたものである。図1,2に示す通り、逆止弁10は、両端に開口1a,1bを有する筒状の本体部1と、本体部1の先端側の開口1aを塞ぐように配置された蓋部3と、本体部1と蓋部3とを連結するヒンジ部5とを備える。図3に示す通り、ヒンジ部5は、蓋部3の蝶番の機能を有するものであり、蓋部3に対して本体部1側から外側に向けて力Fが加わったときに本体部1の開口1aを開放できる可撓性を有している。
逆止弁10の製造方法は、(a)成形工程、(b)切断工程、及び、(c)切断工程を備える。
この工程は、突出部3aを形成するための凹部を有するキャビティ内において、硬度が30~80度であり且つ伸度が200~900%のゴム材料からなる成形体を得るためのものである。キャビティ内において原料に熱や圧力を加えて硬化させる場合、成形体の硬度及び伸度が上記の範囲となるように処理条件を設定する。
この工程は、キャビティから成形体を取り出すためのものである。例えば、成形体の長手方向に沿って、雌型と雄型とを互いに逆向きに引っ張ることにより、キャビティから成形体を取り出す。本実施形態において、逆止弁10の突出部3aとなる部分がアンダーカットとなるが、成形体をなすゴム材料が上記範囲の硬度及び伸度を有することで、アンダーカットの部分に起因する不具合を十分に抑制できる。
この工程は、ヒンジ部5となる部分を残して本体部1と蓋部3とを切り離すためのものである。本体部1の開口1aが、直線状部分Lと、円弧状部分Rとによって構成されているため、成形体を内側に空気を供給して内部を加圧すると、円弧状部分Rに応力が集中して円弧状部分Rのみを切断することができる。
次に、図5,6を参照しながら、逆止弁10を外装体32に内蔵した、自立可能であり搬送容易なフレキシブル真空容器30について説明する。容器30は、可撓性を有する透明フィルムからなる容器本体31と、容器本体31の肩部に斜めに設けられた外装体32と、この外装体32の内蔵された逆止弁10とを備える。逆止弁10は、外装体32の先端側に蓋部3が位置するとともに、容器30の底部を下にした状態(図5に示す状態)にして立たせたときにヒンジ部5が水平方向に伸び、ヒンジ部5よりも下方に突出部3aが位置する向きとなるように内蔵されている。
以下、本発明の他の実施形態として、サックバック機構を備えた容器30を説明する(図9~図12参照)。
図1に示す構成を有し、表1の実施例1~3にそれぞれ示す寸法の逆止弁を作製するため、以下のようにして成形体を作製した。すなわち、キャビティ内にシリコーンゴム原料を入れた後、2つの金型で構成されるキャビティ内において175℃で6分間原料を硬化させることによって成形体を得た。成形体を取り出した後、突出部を顕微鏡により観察したところ、破損は認められなかった。実施例1~3に係る成形体を構成するシリコーンゴムは、いずれも硬度が55度であり、伸度が380%であった。
図1に示す構成を有し、表2の実施例4,5にそれぞれ示す寸法の逆止弁を作製するため、以下のようにして成形体を作製した。すなわち、キャビティ内にシリコーンゴム原料を入れた後、9つの金型で構成されるキャビティ内において170℃で135秒にわたって原料を硬化させることによって成形体を得た。成形体を取り出した後、突出部を顕微鏡により観察したところ、破損は認められなかった。実施例4,5に係る成形体を構成するシリコーンゴムは、いずれも硬度が60度であり、伸度が350%であった。
図8に示す構成を有し、表2の比較例1に示す寸法の逆止弁を作製するため、1つの金型で構成されるキャビティ内にシリコーンゴム原料を流し込み、実施例1~3と同様にして原料を硬化させた。これにより、蓋部に突出部のない成形体を作製した。比較例1に係る成形体を構成するシリコーンゴムは、いずれも硬度が55度であり、伸度が380%であった。
得られた成形体の内側を加圧して、ヒンジ部となる直線状部分以外の部分を円弧状に切断し、実施例1~5及び比較例1の逆止弁を作製した。実施例1~5及び比較例1のいずれの逆止弁においても、蓋部の側面と本体部の内面とのなす角度αは20°とした。
実施例1~5及び比較例1の逆止弁を外装体内に装着し、外装体と容器本体とを溶着させることによって図7に示す構成の容器を作製した。なお、容器本体をなす可撓性フィルムとして、PET/ON/L-LDPEからなる積層フィルムを使用した。
実施例1~5及び比較例1に係る容器に醤油500mlをそれぞれ充填して検体を作製し、下記の落下試験を行った。表1、2に示す落下高さから検体を自然落下させた後、容器内への空気の混入(Air混入)の有無、及び、醤油の吐出性を評価した。なお、空気の混入の有無は目視により判断し、また醤油の吐出性が良好であるか不良であるかは容器を45°程度傾けたときにスムーズに醤油が出るか否かによって判断した。表1,2に結果を示す。
常温にて、醤油を収容した容器を保管し、12、24、36、48及び120時間経過後の、容器内への空気の混入の有無、及び、醤油の吐出性を確認した。5つの検体について、それぞれの条件下で試験を行った。表3に結果を示す。
下記(i)、(ii)の条件下において、醤油を収容した容器を落下させた。容器を落下させる高さを変化させ、落下させた後の容器内への空気の混入の有無、及び、醤油の吐出性を確認した。Airの混入の有無、及び、醤油の吐出性の評価基準は、上述の通りである。5つの検体について、それぞれの条件下で試験を行った。
(i) 外装体のキャップ取り付け部にキャップを装着せずに、容器本体の底部を下にした状態で1回、容器を自然落下させた。表4に結果を示す。
(ii) 外装体のキャップ取り付け部にキャップを装着し、容器本体の底部を下にした状態で1回、その後、容器本体の側面を下にした状態で1回、容器を自然落下させた。表5に結果を示す。
外装体のキャップ取り付け部にキャップを装着しない状態の容器について、落下高さを120cmに固定し、落下回数を5回又は10回として、容器本体の底部を下にした状態で容器を自然落下させた。表6に結果を示す。2つの検体について、それぞれの条件下で試験を行った。
Claims (12)
- ゴム材料からなり一体成形によって製造された逆止弁であって、
両端に開口を有する筒状の本体部と、
前記本体部の一方の開口を塞ぐように配置された蓋部と、
前記本体部と前記蓋部とを連結しており前記蓋部に対して前記本体部側から外側に向けて力が加わったときに前記一方の開口を開放するためのヒンジ部と、
を備え、
前記蓋部は前記本体部の前記一方の開口の周縁部と当接する突出部を側面に有する逆止弁。 - 前記一方の開口は、前記ヒンジ部をなす直線状部分と、円弧状部分とによって構成されている、請求項1記載の逆止弁。
- 前記蓋部の円弧状部分の外径R1は開口の円弧状部分の径R2よりも大きく、R1とR2の差は0.06mm~0.50mmである、請求項2記載の逆止弁。
- 前記蓋部の側面と本体部の内面とのなす角度は15~25°である、請求項3記載の逆止弁。
- 前記ゴム材料は硬度が30~80度であり且つ伸度が200~900%である、請求項4記載の逆止弁。
- フィルムからなる容器本体と、
前記容器本体に装着された請求項1から5のいずれか一項に記載の逆止弁と、
を備える容器。 - 前記逆止弁が装填されたスパウトをさらに備える、請求項6に記載の容器。
- 前記スパウトの先端の液排出口が、途中でいったん窄まりさらにその先で広がる形状である、請求項7に記載の容器。
- 前記逆止弁の本体部の少なくとも一部が、当該逆止弁の内部が負圧となった場合に大気圧との差分に応じて変形して当該逆止弁の容積を減ずる程度に薄く形成されている、請求項8に記載の容器。
- 前記逆止弁の本体部が小径部と大径部とからなる段付き形状であり、前記小径部に前記一方の開口が形成されている、請求項9に記載の容器。
- 前記小径部が前記大径部よりも薄く形成されている、請求項10に記載の容器。
- 両端に開口を有する筒状の本体部と、前記本体部の一方の開口を塞ぐように配置された蓋部と、前記本体部と前記蓋部とを連結しており前記蓋部に対して前記本体部側から外側に向けて力が加わったときに前記一方の開口を開放するためのヒンジ部とを備え、前記蓋部が前記本体部の前記一方の開口の周縁部と当接する突出部を側面に有する逆止弁の製造方法であり、
前記突出部を形成するための凹部を有するキャビティ内において、硬度が30~80度であり且つ伸度が200~900%のゴム材料からなる成形体を得る成形工程と、
前記キャビティから前記成形体を取り出す離型工程と、前記ヒンジ部となる部分を残して前記本体部と前記蓋部とを切り離す切断工程と、
を備える逆止弁の製造方法。
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JP2011554313A JPWO2012011558A1 (ja) | 2010-07-23 | 2011-07-22 | 逆止弁及びその製造方法、並びに、逆止弁を備える容器 |
US13/811,487 US20130119092A1 (en) | 2010-07-23 | 2011-07-22 | Check valve, manufacturing method thereof and container having check valve |
CN2011800359343A CN103052569A (zh) | 2010-07-23 | 2011-07-22 | 止回阀及其制造方法、以及具备止回阀的容器 |
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JP2016210440A (ja) * | 2015-04-30 | 2016-12-15 | 株式会社吉野工業所 | 液吐出容器 |
JP2016217504A (ja) * | 2015-05-25 | 2016-12-22 | 株式会社不二工機 | 逆止弁体及びそれを用いた逆止弁 |
JP2021120285A (ja) * | 2020-01-30 | 2021-08-19 | 株式会社吉野工業所 | 吐出容器 |
JP7366505B2 (ja) | 2020-01-30 | 2023-10-23 | 株式会社吉野工業所 | 吐出容器 |
WO2023190716A1 (ja) * | 2022-03-31 | 2023-10-05 | アルケア株式会社 | 医療用部品及び排泄物収容装具 |
Also Published As
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EP2597051A4 (en) | 2015-04-22 |
EP2597051A1 (en) | 2013-05-29 |
US20130119092A1 (en) | 2013-05-16 |
JP2012106800A (ja) | 2012-06-07 |
CN103052569A (zh) | 2013-04-17 |
JPWO2012011558A1 (ja) | 2013-09-09 |
JP5053463B2 (ja) | 2012-10-17 |
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