JP2014005060A - Back flow preventing container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back flow preventing container, which maintains the quality of contents by securely preventing intrusion of air into a container main body with a simple structure and is excellent in productivity.SOLUTION: A nozzle member 31 has: a cover part 40 for covering a locking protrusion 33 of a pouring port body 16 and a protrusion part 27 so as to connect them; and a cylindrical side wall 41 for covering a side surface of the locking protrusion 33. A locking convex part 43 locked by a locking groove part 35 of the pouring port body 16 is protruded over the entire circumference of a peripheral edge part inside the peripheral edge part of the side wall 41 and a chamfered part 50 is formed at an end edge on the lower inner peripheral side of the locking convex part 43. When the nozzle member 31 is pushed from an upper end part of the pouring port body 16, the locking convex part 43 is brought into contact with the locking protrusion 33 at the chamfered part 50 and the nozzle member 31 is pressed into the side of the pouring port body 16 while escaping to the outside along the inclination of the chamfered part 50. As a result, the cover part 40 is elastically deformed and the side wall 41 is widened radially outwardly.

Description

  The present invention relates to a hollow backflow prevention container that can contain a liquid or gel food, cosmetics, or other fluid material, and that can prevent the inflow of air after pouring out the contents.

  Conventionally, tube-type containers that contain semi-solid seasonings such as kneaded wasabi and cream-like cosmetics, and pouch-type containers that contain beverages, liquid seasonings, and the like are known. Such a container pushes the side of a container main body, raises the pressure of the content, and extrudes the content from the extrusion port of a container main body. However, after the contents have been taken out, the container body is pushed by a force that restores the deformation produced, and the inside of the container becomes negative pressure and air flows from the extrusion port. When the contents come into contact with the air accumulated in such a container body, the contents may be oxidized or spoiled by bacteria in the air. In particular, products that do not contain preservatives have been increasing in recent years, and there has been a demand for tube-type containers that are prone to spoilage and alteration and do not allow air to enter.

  As a container for preventing inflow of air, for example, there is a backflow prevention tube disclosed in Patent Document 1. The backflow prevention tube is provided with a ceiling wall that closes the extrusion port at the extrusion port of the container body, and a plurality of through holes are formed in the ceiling wall. A conical nozzle having a small hole formed at the tip is attached to the tip of the extrusion port, and a valve seat parallel to the ceiling wall is provided inside the nozzle. The valve seat is provided so as to be movable in a direction perpendicular to the ceiling wall. When the valve seat is in contact with the ceiling wall, the through hole is closed by the valve seat, and the valve seat is separated from the ceiling wall. Sometimes, the contents can flow out of the through hole through the outflow groove.

  In the method of using the backflow prevention tube of Patent Document 1, the pressure of the contents increases when the side of the container body is pushed, the valve seat is pushed up from the ceiling wall, the through hole in the ceiling wall is released, and the contents from the nozzle through the outflow groove Flows out. After the contents are taken out, if the pressing of the side surface of the container main body is stopped, a force for returning the deformation of the container main body works, and the container main body side becomes negative pressure. Then, the valve seat is pulled back to the ceiling wall side to close the through hole of the ceiling wall and prevent air from flowing into the container body.

  In addition, there exists a tube currently disclosed by patent document 2 as a container which prevents inflow of air. The tube is provided with a lid member that closes the extrusion port and has a through hole formed in the center thereof at the extrusion port of the container body. The extrusion port further includes a cylinder part having a through hole communicating with the inside of the container body and a piston provided inside the cylinder part, and the piston is biased by a spring toward the outside of the container body. ing. Further, the piston is formed with a conical protrusion that protrudes toward the outside of the container body, and is fitted into the through hole of the lid member to close the through hole.

  In the method of using the tube of Patent Document 2, when the side surface of the container main body is pushed, the pressure of the content increases, the content flows out from the through hole of the cylinder portion into the cylinder portion, and fills between the lid member and the cylinder. And the piston is pushed down into the cylinder part by the pressure of the filled contents, and the projection of the piston is pulled out from the through hole of the lid member. As a result, the outlet is opened and the contents are pushed out. After the contents are taken out, if the pressure on the side of the container body is stopped, the pressure of the contents filled between the lid member and the cylinder part decreases, and the piston moves toward the outside of the cylinder part by the biasing force of the spring. Then, the through hole of the lid member is closed. This prevents air from flowing into the container body.

  However, in the case of the backflow prevention tube disclosed in Patent Document 1, the contents remain inside the nozzle outside the valve seat. The contents remaining inside the nozzle were always in contact with the air entering from the nozzle, and there was a risk of decay and alteration. Further, in the case of the tube disclosed in Patent Document 2, the structure is complicated and the cost is increased. Further, there is a risk that the contents or the like may enter between the cylinder part and the piston, and there is a risk that problems such as defective outflow of the contents may occur.

  Therefore, Patent Document 3 discloses a container body having elasticity and having an extrusion port formed at one end thereof, an inner plug provided by closing the extrusion port, an outer side of the extrusion port provided at the center of the inner plug. A protruding inner plug protrusion, a through hole provided in the inner plug and communicating between the inner side and the outer side of the container body, and a nozzle member that is elastic and closely contacts the peripheral edge of the extrusion port and the side surface of the inner plug protrusion are provided. In addition, there is disclosed a backflow prevention container that reliably prevents air from entering the container body and the backflow of contents with a simple structure.

Japanese Utility Model Publication No. 57-143147 Japanese Utility Model Publication No. 58-21399 JP 2002-2755 A

  By the way, in the backflow prevention container of Patent Document 3, when the nozzle member is fitted from the outside of the inner plug, the radial dimension of the nozzle member can be increased, and the nozzle member is also deformed when the contents are poured out. Since it becomes large, the content extraction speed can be increased. In this case, it is necessary to make the inner diameter of the nozzle member smaller than the outer diameter of the inner plug so that the nozzle member is not easily detached from the inner plug, and to elastically deform the nozzle member. Therefore, when the nozzle member is fitted from the outside of the inner plug, the side wall of the nozzle member and the outer peripheral portion of the inner plug interfere with each other, and the nozzle member cannot be easily mounted and productivity is lowered. there were.

  In view of the above problems, an object of the present invention is to provide a backflow prevention container that has a simple structure and reliably prevents air from entering the container body, maintains the quality of the contents, and is excellent in productivity. And

  In order to achieve the above object, the present invention comprises a container main body that has a storage part that stores the contents, and an outlet that takes out the content formed at one end of the storage part, and is deformable by an external force, A cylindrical note having a conical protrusion projecting outward from the outlet of the container body, and a through-hole communicating between the inside and the outside of the container body provided along the outer periphery of the protrusion. The cross section is V-shaped in close contact with the outlet body, the peripheral edge of the spout main body and the side surface of the protrusion, and from the contact portion with the peripheral edge of the spout main body toward the contact portion with the protrusion. An elastically deformable cover having a concave concave shape and having a cover portion in which a pouring hole is formed in the center, and a side wall that is erected in a cylindrical shape from the peripheral edge of the cover portion and is externally inserted into the spout main body A nozzle member, and an outer lid that is externally mounted on the nozzle member and the spout main body. In the flow prevention container, the spout main body protrudes annularly above the through hole on the outside of the through hole to support the cover portion, and the container main body side of the lock protrusion is closer to the container main body. An engaging groove formed in an annular shape on the outer peripheral surface, and the nozzle member protrudes annularly radially inward from the inner peripheral surface of the side wall and fits into the engaging groove. A locking projection that is smaller than the outer diameter of the locking projection and the entire circumference of the lower inner peripheral edge of the locking projection, and when mounting the nozzle member on the spout main body, And a chamfered portion in contact with the locking projection.

  In the backflow prevention container having the above-described configuration, the chamfered portion may be provided at a lower corner portion of the locking groove portion facing the chamfered portion when the nozzle member is mounted on the spout main body. An inclined surface having substantially the same angle as the chamfered portion that is in surface contact with the surface is provided.

  In the backflow prevention container having the above-described configuration, the nozzle member includes a cylindrical protrusion that protrudes in the same direction as the protrusion from a peripheral edge of the extraction hole that contacts the entire periphery of the side surface of the protrusion. Is provided.

  According to the present invention, in the backflow prevention container configured as described above, the nozzle member is formed of silicone rubber having a JIS hardness of 50 °.

  According to the first configuration of the present invention, the nozzle member is pushed into the spout main body while the chamfered portion formed on the locking projection of the nozzle member and the locking projection of the spout main body are brought into contact with each other. The stopper convex portion is pushed in while escaping to the outside along the inclination of the chamfered portion, the cover portion is elastically deformed, and the side wall is expanded radially outward. Therefore, the nozzle member can be easily attached to the spout main body simply by performing an operation of pushing the nozzle member, and the backflow prevention container having excellent productivity can be obtained.

  According to the second configuration of the present invention, in the backflow prevention container of the first configuration, the spout main body has a lower corner of the locking groove facing the chamfered portion when the nozzle member is mounted on the spout main body. By providing an inclined surface with substantially the same angle as the chamfered portion in surface contact with the chamfered portion, the locking convex portion fits into the locking groove portion having substantially the same cross-sectional shape without any gap, so that the nozzle member by external force There is no fear that it will come off easily from the spout body.

  Moreover, according to the 3rd structure of this invention, in the backflow prevention container of the said 1st or 2nd structure, it is a protrusion from the peripheral part of the extraction hole which contacts a nozzle member to the perimeter of the side surface of a protrusion. By providing a cylindrical protrusion that protrudes in the same direction as the container, if the contents inside the container body become depressurized and the contents cannot be poured out, the cover part is elasticized by picking and pulling the tip of the cylindrical protrusion By deforming and creating a gap between the protrusion of the spout main body, the contents can be poured out by allowing air to flow backward into the container main body.

  Further, according to the fourth configuration of the present invention, in the backflow prevention container having any one of the first to third configurations, the nozzle member is formed of silicone rubber having a JIS hardness of 50 °. It has an air entry prevention effect and a backflow prevention effect due to its high adhesion to the protrusions, and is easily deformed by pressing of the container body, so that it becomes a backflow prevention container with excellent contents pouring property.

1 is an external perspective view of a backflow prevention container 1 according to an embodiment of the present invention. Side surface sectional drawing which shows the state which decomposed | disassembled the spout 12 shown in FIG. Side sectional view of the spout 12 shown in FIG. The top view which looked at the spout 12 from the container main body 11 side Sectional drawing of the nozzle member 31 with which the spout main body 16 is mounted | worn Side surface sectional drawing of the spout 12 which shows the state which the cover part 40 of the nozzle member 31 elastically deformed and was extended outside Side surface sectional view which shows a mode that the nozzle member 31 is mounted | worn with the spout main body 16 Partial sectional view showing how the side wall 41 is elastically deformed when the nozzle member 31 is mounted.

  Hereinafter, the backflow prevention container of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a backflow prevention container 1 according to an embodiment of the present invention. The backflow prevention container 1 is a so-called standing pouch type, and includes a container body 11 formed of a laminated film in which a thermoplastic resin layer is formed as an innermost layer, and a handle formed on one shoulder of the container body 11. And a synthetic resin cylindrical spout 12 attached to the outlet 11a.

  The container body 11 includes a front film 13, a rear film 14, and a bottom film 15. In the manufacturing process of the container body 11, first, the front film 13 and the rear film 14 formed of a laminated film are opposed to each other so that the thermoplastic resin layer is on the inner side. Next, it is folded back so that the thermoplastic resin layer of the bottom film 15 formed of a rectangular laminated film is on the outside, and inserted between the lower part of the front film 13 and the rear film 14.

  And by heat-sealing the peripheral edge part which these films 13-15 oppose each other, in the container main body 11, a pair of side edges 21 and 22, the top 19 and the bottom 23 which cross | intersect these, and the content A storage portion 18 for storing objects is formed. As a heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, or an ultrasonic seal can be used.

  The spout 12 includes a spout body 16 and an outer lid 17. The spout main body 16 has a cylindrical shape with both ends open, and has a flange 16a projecting in the radial direction. The outer lid 17 has a cylindrical shape with a female screw portion 17a (see FIG. 2) formed on the inner peripheral surface, and a male screw portion 16b (see FIG. 2) formed on the outer peripheral portion of the spout main body 16. And screwed onto.

  The spout main body 16 has a front film 13 and a rear film at an intermediate portion of the oblique side 20 formed by obliquely cutting a shoulder portion formed between the top side 19 and the one side 22 of the container main body 11. It is heat-sealed in a state of being sandwiched between 14 and attached. As a result, the spout 12 protrudes obliquely upward and can be electrically connected to the storage portion 18 of the container body 11. The detailed configuration of the spout 12 will be described later.

  2 is a side sectional view showing a state where the spout 12 shown in FIG. 1 is disassembled, FIG. 3 is a side sectional view of the spout 12 shown in FIG. 1, and FIG. 4 is a side view of the spout 12 from the container body 11 side. FIG. 5 is a sectional view of the nozzle member 31 attached to the spout main body 16. The spout main body 16 constituting the spout 12 is formed of a resin material having rigidity. Here, high-density polyethylene (HDPE) is used as the material of the spout main body 16. The base end portion of the spout main body 16 communicates with the storage portion 18 (see FIG. 1) of the container main body 11.

  At the center of the upper end portion of the spout main body 16, a triangular pyramid-shaped protrusion 27 that protrudes outward is formed. Further, four elongated holes 30 are formed at equal intervals along the outer periphery of the protrusion 27, and the inside and the outside of the spout main body 16 are communicated with each other. An annular locking projection 33 for locking a nozzle member 31 described later is formed on the upper end of the spout main body 16, and an annular locking groove 35 is formed below the locking projection 33. Yes.

  A nozzle member 31 is attached to the upper end portion of the spout main body 16. The nozzle member 31 is integrally formed of a flexible elastic material, and here, a silicone rubber having a JIS hardness of 50 ° is used as the material of the nozzle member 31. The nozzle member 31 has a cover portion 40 that covers the locking protrusion 33 and the protrusion 27 of the spout main body 16 so as to be connected. The cover portion 40 is thin and has a dish-like shape, and a minute space S is formed between the upper end surface of the spout main body 16. A cylindrical side wall 41 that covers the side surface of the locking projection 33 is provided at the peripheral edge of the cover portion 40, and a locking convex portion 43 that is locked by the locking groove 35 is provided inside the peripheral edge of the side wall 41. , Projecting over the entire periphery. A chamfered portion 50 is formed at the edge on the lower inner peripheral side of the locking convex portion 43. A circular pouring hole 45 is formed at the center of the cover portion 40 at a position facing the tip of the projecting portion 27, and the peripheral edge of the pouring hole 45 abuts the entire circumference of the side surface of the projecting portion 27. A cylindrical protrusion 47 is provided in the same direction as the protruding direction of the protrusion 27.

  Next, the usage method of the backflow prevention container 1 of this invention is demonstrated. A liquid content is accommodated in the container body 11, and the spout body 16 is attached to the outlet 11 a of the container body 11. Then, the nozzle member 31 is attached to the spout main body 16, and the outer lid 17 is attached by screwing the female screw portion 17a of the outer lid 17 covering the nozzle member 31 with the male screw portion 16b.

  And when taking out the contents, the side surface of the container main body 11 is pressed. Thereby, the pressure of the contents of the container main body 11 increases, the contents flow out from the through holes 30 of the spout main body 16, and the contents are contained in the space S surrounded by the spout main body 16 and the cover portion 40 of the nozzle member 31. Will be charged. Then, as shown in FIG. 6, the thin cover portion 40 of the nozzle member 31 is elastically deformed and spread outward by the pressure acting to extrude the filled contents outward. And the clearance gap C arises between the peripheral part of the extraction hole 45 of the cover part 40 in which the cylindrical protrusion 47 was formed, and the protrusion 27, and the content flows out from this clearance gap C, and is extruded from the extraction hole 45. .

  After removing an arbitrary amount of contents from the backflow prevention container 1, when the pressing of the container body 11 is stopped, the container body 11 has a force to restore the deformation caused by the pressing, and the inside of the container body 11 is negative. Become pressure. Then, the deformation of the cover part 40 is restored, and the peripheral part of the extraction hole 45 comes into close contact with the protrusion 27 again, preventing the inflow of air and the back flow of the contents once touched by the outside air.

  The backflow prevention container 1 of the present embodiment does not suck air into the container main body 11 after taking out the contents, or the contents once touched by the outside air do not flow back. As a result, the contents can be kept constant without contacting the air and causing the contents to be altered or spoiled. Moreover, the addition amount of the preservative mixed in the contents can be reduced.

  Furthermore, since the nozzle member 31 is made of a flexible elastic body, high airtightness can be maintained, air ingress and backflow of contents can be reliably stopped, and the contents are low in viscosity. Even in the case of liquid, there is no leakage. Moreover, when the side surface of the container main body 11 is pressed, it is easily elastically deformed by the pressure of the contents, and the contents can be pushed out easily with a weak force. Since the cover portion 40 of the nozzle member 31 and the protrusion 27 of the spout main body 16 are in close contact with each other in the vicinity of the extraction hole 45 of the nozzle member 31, the content staying in the space S inside the cover portion 40. Things do not touch air and do not deteriorate.

  The nozzle member 31 is provided with a cover portion 40 that is recessed inside the side wall 41, so that the cover portion 40 is not deformed by an external force and the contents are not inadvertently discharged or air flows in safely. And hygienic.

  Further, since the nozzle member 31 is fitted to the upper part of the side surface of the spout main body 16 from the outside, the radial dimension of the cover portion 40 that contacts the locking projection 33 and the protrusion 27 can be increased. Thereby, the cover part 40 becomes easy to deform | transform and it can speed up the extraction | pouring speed of the contents.

  In addition to adjusting the radial dimension of the cover 40, the content extraction speed is the amount of overlap between the protrusion 27 of the outlet main body 16 and the cover 40 of the nozzle member 31 (the peripheral edge of the extraction hole 45). Can also be adjusted. When the overlap amount between the protrusion 27 and the cover portion 40 is large, the amount of deflection of the cover portion 40 when the nozzle member 31 is attached to the spout main body 16 also increases, and the cover portion 40 is strongly pressed against the protrusion 27. The As a result, the cover portion 40 is less likely to be elastically deformed by the pressure of the contents, and the effect of preventing the ingress of air and the effect of preventing the backflow of the contents are improved, but the dispensing speed of the contents is reduced.

  On the other hand, if the amount of overlap between the protrusion 27 and the cover 40 is small, the pressure contact force of the cover 40 with respect to the protrusion 27 becomes weak, and the effect of preventing air from entering and preventing the backflow of contents decreases. The speed at which items are poured out increases. Therefore, the overlap amount between the protrusion 27 and the cover 40 may be set in consideration of the pouring speed required for the backflow prevention container 1, the air entry prevention effect, and the content backflow prevention effect.

  In addition, when the content becomes small and the inside of the container main body 11 is in a decompressed state and the front film 13 and the rear film 14 are in close contact with each other, the content may not be poured out. In such a case, the cover 40 is elastically deformed by picking up and pulling the tip of the cylindrical protrusion 47 of the nozzle member 31, and a gap is formed between the protrusion 27 of the spout main body 16. Thereby, air can be deliberately flowed back into the container main body 11, and the content can be poured out.

  FIG. 7 is a side cross-sectional view showing a state where the nozzle member 31 is mounted on the spout main body 16, and FIG. 8 is a partial cross-sectional view showing a state where the side wall 41 is elastically deformed when the nozzle member 31 is mounted. When the nozzle member 31 is attached to the spout main body 16, as shown in FIG. 7, with the spout main body 16 fixed to a jig (not shown), the nozzle member 31 is removed from the upper end of the spout main body 16. Push in. Here, since the inner diameter of the locking projection 43 of the nozzle member 31 is smaller than the outer diameter of the locking projection 33 of the spout main body 16, when the nozzle member 31 is pushed in, the locking projection 43 and the locking projection 33 Interfere.

  In this embodiment, since the chamfered portion 50 is formed on the nozzle member 31 at the edge on the lower inner peripheral side of the locking convex portion 43, the locking convex portion 43 is chamfered as shown in FIG. Then, it comes into contact with the locking projection 33 and is pushed into the spout main body 16 side while escaping outward along the inclination of the chamfered portion 50. As a result, the cover part 40 is elastically deformed, and the side wall 41 is expanded radially outward. And when the latching convex part 43 gets over the latching protrusion 33, the side wall 41 shrink | contracts to radial inside by a restoring force, and the latching convex part 43 fits into the latching groove part 35, and is to the spout main body 16. The mounting of the nozzle member 31 is completed.

  According to said structure, the nozzle member 31 can be easily mounted | worn with the spout main body 16 only by performing operation which pushes in the nozzle member 31, and it is excellent in productivity. In addition, since the locking groove portion 35 is formed with an inclined surface 51 having substantially the same angle that makes surface contact with the chamfered portion 50, the locking protrusion portion 43 is fitted into the locking groove portion 35 having substantially the same cross-sectional shape without any gap. In combination, the nozzle member 31 is not easily detached from the spout main body 16 by an external force.

  In addition, as a method of suppressing interference between the locking projection 43 and the locking projection 33 when the nozzle member 31 is pushed in, it is conceivable to chamfer the corner portion outside the upper end of the locking projection 33. However, in order to exert a stable backflow prevention effect, the locking projection 33 needs to keep the shape of the cover portion 40 of the nozzle member 31 constant, and when the locking projection 33 is chamfered As a result, the shape holding function of the cover 40 is deteriorated. Therefore, it is necessary to form the chamfered portion 50 not on the locking projection 33 but on the locking projection 43 of the nozzle member 31.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the configuration of the backflow prevention container 1 shown in FIG. 1 is only a preferred example, and a tube filled with semisolid food such as kneaded wasabi or creamy cosmetics instead of the standing pouch-type container body 11 is used. A shaped container body can also be used.

  INDUSTRIAL APPLICABILITY The present invention can be used for a hollow backflow prevention container that contains a liquid or gel food, cosmetics, or other fluid material, and that can prevent the inflow of air after pouring out the contents. By using the present invention, air can be reliably prevented from entering the container main body with a simple structure, the quality of the contents can be maintained, and the nozzle can be easily attached to the spout main body simply by pushing it in. However, it is excellent, and it becomes a backflow prevention container in which there is no possibility that the nozzle member will come off after mounting.

DESCRIPTION OF SYMBOLS 1 Backflow prevention container 11 Container main body 12 Outlet 16 Outlet main body 17 Outer lid 18 Storage part 27 Protrusion part 30 Through-hole 31 Nozzle member 33 Locking protrusion 35 Locking groove part 40 Cover part 41 Side wall 43 Locking convex part 45 Hole 47 Cylindrical protrusion 50 Chamfer 51 Inclined surface

Claims (4)

A container main body having a storage section for storing the contents, and an outlet for taking out the contents formed at one end of the storage section, and deformable by an external force;
A cylindrical note having a conical protrusion projecting outward from the outlet of the container body, and a through-hole communicating between the inside and the outside of the container body provided along the outer periphery of the protrusion. An exit body;
A concave shape that is in close contact with the peripheral edge of the spout main body and the side surface of the protrusion, and whose cross section is recessed in a V shape from the contact portion with the peripheral edge of the spout main body toward the contact portion with the protrusion. An elastically deformable nozzle member having a cover part in which a pouring hole is formed at the center, and a side wall that is erected in a cylindrical shape from the peripheral part of the cover part and is externally inserted into the spout main body,
An outer lid that is externally mounted on the nozzle member and the spout main body;
In a backflow prevention container equipped with
The spout main body is annularly protruded above the through hole outside the through hole to support the cover portion, and is annularly formed on the outer peripheral surface of the container main body with respect to the lock protrusion. A locking groove formed,
The nozzle member protrudes annularly radially inward from the inner peripheral surface of the side wall and fits into the locking groove, and has a locking projection having an inner diameter smaller than the outer diameter of the locking protrusion, A chamfered portion that is formed over the entire circumference of the lower inner peripheral edge of the convex portion and that contacts the locking projection when the nozzle member is mounted on the spout body. Backflow prevention container.   The spout body is inclined at substantially the same angle as the chamfered portion in surface contact with the chamfered portion at the lower corner of the locking groove that faces the chamfered portion when the nozzle member is mounted on the spouted body. The backflow prevention container according to claim 1, wherein a surface is provided.   The said nozzle member is provided with the cylindrical protrusion which protrudes in the same direction as the said protrusion from the peripheral part of the said extraction hole contact | abutted to the perimeter of the side surface of the said protrusion. Item 3. A backflow prevention container according to item 2.   The backflow prevention container according to any one of claims 1 to 3, wherein the nozzle member is made of silicone rubber having a JIS hardness of 50 °.

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