JP6636853B2 - Double container - Google Patents

Description

  The present invention comprises a flexible outer layer body and a volume-reducible deformable inner layer housed inside the outer layer body, wherein the contents contained in the inner layer body are poured out by pressing the outer layer body. Related to heavy containers.

  Containers for storing cosmetics such as lotions, shampoos, rinses, liquid soaps, and food seasonings include a flexible outer layer body and a volume-reducible deformable inner layer housed inside the outer layer body. There is known a double container (also referred to as a delamination container) in which the contents contained in the inner layer body are poured out by pressing the outer layer body. The outer layer of such a double container is provided with vents (through holes, slits, etc.) that penetrate the front and back, and when the pressed outer layer is restored, the outer layer and the inner layer interact with each other through the vents. It is possible to take in air in between. Thereby, only the outer layer body can be restored while the inner layer body is reduced in volume.

  As such a double container, for example, Patent Literature 1 discloses an outer layer body having a vent on a peripheral wall of a mouth, a pouring cap attached to the outer layer body and having an outside air introduction hole connected to the vent, and a pouring cap. A check valve that is provided inside the airbag and normally closes the outside air introduction hole, while releasing the outside air introduction hole when the outer layer body is restored and the pressure between the outer layer body and the inner layer body becomes negative. It is shown. Further, the double container is provided with an inner plug that covers the upper opening of the outer layer body inside the pouring cap, and the check valve is held between the pouring cap and the inner plug.

JP 2013-151316 A

  By the way, in recent years, efforts to reduce the number of parts as much as possible from the viewpoint of consideration for the environment and cost reduction have been actively promoted, and reduction of the number of parts is required even in such a double container.

  Therefore, in the present invention, it is an object of the present invention to reduce the number of parts of members related to the periphery of the check valve, particularly focusing on a check valve used for a double container, thereby achieving resource saving and cost reduction. The purpose of the present invention is to propose a double container that can be used.

The present invention has a flexible outer layer body provided with a vent on the mouth peripheral wall,
An inner layer body which has a filling space capable of accommodating contents and is deformed to reduce in volume by air introduced between the outer layer body and the vent hole.
A pour cap having a top wall located above the mouth peripheral wall and having an outside air introduction hole communicating with the inlet and the ventilation hole communicating with the filling space,
A double container having a check valve that closes the outside air introduction hole in a state where the outer layer body is pressed and releases the outside air introduction hole in a state where the outer layer body is restored,
It is a double container that holds the check valve sandwiched between the upper end surface of the mouth peripheral wall or the inner layer body that covers the upper end surface of the mouth peripheral wall and the back surface of the top wall.

  The check valve is of a donut type, and has an inner edge portion sandwiched by the top wall, an elastically deformable intermediate portion located radially outside the inner edge portion, and a radially outer portion located at the radially outside of the intermediate portion. It is preferable to have a front end portion that closes the outside air introduction hole by contacting the back surface of the top wall.

  It is preferable that the check valve has a distal end in a bulged shape.

  It is preferable that the check valve has a thicker inner edge portion than the intermediate portion.

  In the check valve, it is preferable that the inner edge portion, the intermediate portion, and the distal end portion have a plate shape having substantially the same thickness.

  It is preferable that the check valve has the same shape at the top and bottom with the middle in the thickness direction as a boundary.

  It is preferable that the top wall has a valve seat surface with which the distal end portion abuts extending in the same direction as a holding surface that sandwiches the inner edge portion.

  It is preferable that the valve seat surface has a protruding portion that presses the front end portion to elastically deform the intermediate portion.

  It is preferable that the top wall is inclined downward as the valve seat surface with which the distal end portion abuts radially outward with respect to a holding surface that sandwiches the inner edge portion.

  The non-return valve of the present invention is not held by being sandwiched between the ejection cap and the inner plug as in the related art, but is held by the ejection cap and the outer layer body (or the outer layer body via the inner layer body). Things. That is, since the inner plug used in the conventional double container becomes unnecessary, the number of parts can be reduced.

  Such a check valve can be provided locally so as to cover only the outside air introduction hole. However, in this case, the check valve needs to be aligned with the outside air introduction hole. . On the other hand, when the check valve is of a donut type, the alignment is not required, so that the workability at the time of mounting is improved.

  Also, as the check valve, for example, a tip having a bulging shape, an inner edge having a greater thickness than an intermediate portion, an inner edge, an intermediate portion, and a tip having a plate shape having substantially the same thickness. It is possible to adopt various forms. The check valve preferably has the same shape at the top and bottom with the middle in the thickness direction as a boundary.

  Also, the top wall of the discharge cap can be of various forms, for example, a valve seat surface with which the tip of the check valve abuts extends in the same direction as the clamping surface that clamps the inner edge, or One in which the valve seat surface is inclined downward toward the outside in the radial direction with respect to the holding surface, and the like can be given. In the case where the valve seat surface extends in the same direction as the holding surface, a check portion is provided on the valve seat surface so as to press against the tip of the check valve and elastically deform the intermediate portion. Can be pushed down, so that the outside air introduction hole can be more reliably closed.

It is sectional drawing and a partial expanded sectional view which show 1st Embodiment of the double container according to this invention. (A) is a partial expanded sectional view showing a 2nd embodiment of a double container according to the present invention, and (b) and (c) are figures showing its modification. (A) is a partial enlarged sectional view showing a third embodiment of a double container according to the present invention, and (b) is a view showing a modification thereof. (A) is a partial enlarged sectional view showing the fourth embodiment of the double container according to the present invention, and (b) is a partial enlarged sectional view showing the fifth embodiment of the double container according to the present invention.

  Hereinafter, the present invention will be described more specifically with reference to the drawings. In this specification, the claims, and the abstract, “up” and “down” refer to the orientation in a posture (erect posture) in which the double container is placed on a horizontal plane.

  In FIG. 1, reference symbol A indicates a first embodiment of a double container according to the present invention. The double container A is composed of an outer layer body 1, an inner layer body 2, a check valve (air check valve) 3, a discharge cap 4, a content check valve 5, and a lid 6.

  The outer layer body 1 is formed of a synthetic resin, and is formed by connecting a flexible bottomed cylindrical body (not shown) to a cylindrical mouth peripheral wall 1a, and is formed in a bottle shape as a whole. It is. A recess 1b is provided on the outer peripheral surface of the mouth peripheral wall 1a, and a through-hole (vent) 1c penetrating the front and back of the mouth peripheral wall 1a is provided at a portion where the recess 1b is provided. On the outer peripheral surface of the mouth peripheral wall 1a, a projection 1d projecting radially outward is provided below the ventilation hole 1c.

  The inner layer body 2 is made of a thin synthetic resin, and can be deformed by volume reduction. A filling space S for accommodating contents is provided inside the inner layer body 2.

  The outer layer body 1 and the inner layer body 2 of the present embodiment are formed by laminating synthetic resins having low compatibility with each other in a releasable manner. Such an outer layer body 1 and an inner layer body 2 can be obtained by blow molding a parison in which a synthetic resin material forming the outer layer body 1 and a synthetic resin material forming the inner layer body 2 are laminated. In addition, a test tube preform in which a synthetic resin material forming the outer layer body 1 and a synthetic resin material forming the inner layer body 2 are laminated is prepared, and the preform is formed by biaxial stretching blow molding. Alternatively, the outer layer body and the inner layer body may be separately formed, and thereafter, the inner layer body may be mounted in the outer layer body.

  Above the peripheral wall 1a of the outer layer body 1, a check valve 3 for air is provided. The pneumatic check valve 3 is a donut type having a circular outer edge and a circular hole at the center. As shown in the partially enlarged sectional view of FIG. 1, the check valve for air 3 includes an inner edge 3a in contact with the inner layer body 2 covering the upper end surface of the mouth peripheral wall 1a, and a radially outer side of the inner edge 3a. It comprises an elastically deformable intermediate portion 3b and a distal end portion 3c located radially outside the intermediate portion 3b. In the pneumatic check valve 3 of the present embodiment, the inner edge portion 3a and the intermediate portion 3b have a plate shape having substantially the same thickness, and the tip portion 3c has a rounded bulging surface. In addition, since the check valve 3 for air has the same upper and lower shape with respect to the middle in the thickness direction (in FIG. 1, denoted by the symbol M and indicated by a two-dot chain line), it can be attached without distinguishing between the front and back. The pneumatic check valve 3 can be formed of a soft resin such as rubber or elastomer (such as soft polyethylene), or a film made of a synthetic resin.

  The pouring cap 4 has a cylindrical outer peripheral wall 4a surrounding the mouth peripheral wall 1a. On the inner surface of the outer peripheral wall 4a, there is provided a claw portion 4b which engages with the projection 1d to hold the pouring cap 4 in place. The outer layer body 1 and the pouring cap 4 may be screwed together by providing a male screw or a female screw instead of the protrusion 1d and the claw 4b.

  A plate-like top wall 4c is provided at the upper end of the outer peripheral wall 4a. The top wall 4c includes a pouring cylinder 4d that rises upward and has a tip portion bent radially outward to form a lip, and a cylindrical shape that extends downward from the inner surface of the pouring cylinder 4d. And an inlet 4f which is open at the lower end of the cylindrical portion 4e and communicates with the filling space S. At the lower part of the cylindrical portion 4e, there is provided a reduced diameter portion 4g whose diameter decreases as it goes downward. A rib 4h whose upper part curves inward in the radial direction is provided on the inner surface of the cylindrical portion 4e.

  Further, a seal wall 4j is provided radially outside the cylindrical portion 4e so as to sandwich the inner layer body 2 with the outer layer body 1 to prevent leakage of contents from the filling space S.

  Further, outside the seal wall 4j, a through-hole (outside air introduction hole) 4k is provided above the check valve 3 for air and vertically penetrates through the ceiling wall 4c. Here, the back surface (clamping surface) 4m of the top wall 4c on the radially inner side of the outside air introduction hole 4k is an inner layer that covers the upper end surface of the mouth peripheral wall 1a when the pouring cap 4 is attached to the outer layer body 1. Since the inner edge portion 3a is sandwiched between the body 2 and the body 2, the check valve 3 for air can be held. As described above, the double container A of the present embodiment can hold the air check valve 3 without using the inner stopper used in the conventional double container. In this state, the front end 3c is in contact with the rear surface (valve seat surface) 4n of the top wall 4c radially outside the outside air introduction hole 4k, and the outside air introduction hole 4k is closed. In addition, the valve seat surface 4n of the present embodiment is located above the holding surface 4m by an amount corresponding to the tip 3c of the bulging shape of the air check valve 3, while being in the same direction (horizontal direction) as the holding surface 4m. Extends.

  The content check valve 5 has a spherical shape and is movably provided in the cylindrical portion 4e. The check valve 5 for contents is in contact with the inner peripheral surface of the reduced diameter portion 4g over the entire circumference in a state where the double container A is in the upright posture as shown in FIG. This prevents contact between the contents in the filling space S and the outside air. Note that the content check valve 5 indicated by the two-dot chain line shows a state in which the content check valve 5 has moved upward with the lid 6 closed.

  The lid 6 includes a plate-like top wall 6a located above the top wall 4c, and an outer wall 6b extending downward from the outer edge of the top wall 6a and connected to the outer peripheral wall 4a. Here, the outer peripheral wall 4a and the outer wall 6b are integrally connected via a hinge h. On the outer wall 6b, on the side opposite to the side on which the hinge h is provided, a finger hook 6c that has a shape extending in the horizontal direction and is a portion to which a finger is put when opening and closing is provided. It is also possible to omit the hinge h and separate the pouring cap 4 and the lid 6 from each other, and hold the lid 6 by screw connection.

  On the back surface of the top wall 6a, a cylindrical seal cylinder 6d that comes into contact with the inner peripheral surface of the cylindrical portion 4e in a state where the lid 6 is closed, and a lid 6 that is located radially inward of the seal cylinder 6d. A bar-shaped portion 6e for preventing the content check valve 5 from coming out of the cylindrical portion 4e in the closed state is provided.

  When pouring out the contents from the double container A having such a structure, after opening the lid 6, the outer layer body 1 is changed from the upright posture to the tilted posture, and the outer layer body 1 is not shown in the drawing. Press the torso. As a result, the filling space S is pressurized through the air existing between the outer layer body 1 and the inner layer body 2, and as a result, the contents of the filling space S enter the cylindrical portion 4e from the inlet 4f, and The contents are poured out from the outlet cylinder 4d. The tip 3c of the check valve 3 for air is in contact with the valve seat surface 4n of the pouring cap 4 and the outside air introduction hole 4k is closed, so that the space between the outer layer body 1 and the inner layer body 2 is provided. The existing air does not leak from the outside air introduction hole 4k.

  After the contents are poured out, when the outer layer body 1 is released from being pressed against the body, the outer layer body 1 tries to return to its original shape by its own restoring force. Is in a negative pressure state. Then, the intermediate portion 3b of the air check valve 3 is elastically deformed by the external air pressure, and the distal end portion 3c is separated from the valve seat surface 4n. Air is taken in between. As a result, only the outer layer body 1 can be restored while the inner layer body 2 is deformed to reduce the volume.

  Next, a second embodiment of the double container according to the present invention will be described with reference to FIGS. The double container B shown in FIG. 2A is provided with an air check valve 13 in place of the air check valve 3 in the above-described double container A, and injecting in place of the pouring cap 4. The cap 14 is provided.

  Like the pneumatic check valve 3, the pneumatic check valve 13 is a donut-shaped one having a circular outer edge and a circular hole at the center. In addition, the check valve 13 for air has an inner edge portion 13a, an intermediate portion 13b, and a tip portion 13c in a plate shape having substantially the same thickness. As described above, since the air check valve 13 has substantially the same thickness as a whole, it can be formed by punching a thin sheet, for example. In the case where the air check valve 13 is formed by such punching, a sheet may be punched above the upside-down pouring cap 14 and then pushed into the pouring cap 14 as it is. It is possible. In this case, the check valve 13 for air can be efficiently set with respect to the discharge cap 14, so that the number of assembling steps can be reduced.

  The dispensing cap 14 has a valve seat surface 14n in place of the valve seat surface 4n of the dispensing cap 4, while other parts including the top wall 14c, the outside air introduction hole 14k, and the holding surface 14m are dispensing caps. 4 has the same shape as FIG. Here, the valve seat surface 14n is located at the same height as the holding surface 14m, and extends in the same direction (horizontal direction) as the holding surface 14m.

  According to such a double container B, the tip portion 13c and the valve seat surface 14n can be brought into surface contact. Note that a slight gap may be formed between the distal end portion 13c and the valve seat surface 14n depending on how the pneumatic check valve 13 is attached and the shape accuracy of the dispensing cap 14. In a case where there is a possibility of such a situation, as shown in FIG. 2 (b), a protruding portion 14p which protrudes downward from the valve seat surface 14n and forms a small step with the valve seat surface 14n is provided, and air is provided. It is preferable that the check valve 13 is slightly deformed. This allows the tip portion 13c and the protruding portion 14p to be in close contact with each other, so that the outside air introduction hole 14k can be more reliably closed.

  Such a check valve 13 for air is provided with a projection on the outer peripheral surface of the sealing wall 4i in order to prevent the check valve 13 from dropping off from the cap 14 after being attached to the cap 14 and before being attached to the outer layer body 1. However, there is a fear that the surface of the seal wall 4j may be damaged when attached to the pouring cap 14, and the sealing performance of the seal wall 4j may be impaired. For this reason, as shown in FIG. 2C, it is preferable to provide a projection t on the inner peripheral surface of the outer peripheral wall 4a to prevent the outer peripheral wall 4a from falling off. Here, the protruding portion t may be an annular shape that surrounds the outer peripheral wall 4a over one circumference, or may be an intermittent shape provided partially in the circumferential direction. The air check valve 13 may be of a donut type having a circular outer edge as shown in FIGS. 2 (a) and 2 (b), and a circular outer edge and having a center as shown in FIG. 2 (c). The basic shape may be a donut shape having a circular hole, and a shape having a portion that partially projects radially outward from the circular outer edge may be used.

  FIGS. 3A and 3B show a third embodiment of a double container according to the present invention. In the double container C of the present embodiment, a check valve 13 for air similar to that of the double container B is provided for the double container A described above instead of the check valve 3 for air. A pouring cap 24 is provided in place of the cap 4.

  The dispensing cap 24 is provided with a valve seat surface 24n instead of the valve seat surface 4n of the dispensing cap 4, while other parts including the top wall 24c, the outside air introduction hole 24k, and the holding surface 24m are formed by the dispensing cap 4n. It has the same shape as. The valve seat surface 24n is inclined downward toward the outside in the radial direction with respect to the holding surface 24m.

  As shown in FIG. 3A, the check valve 13 for air is provided such that at least the distal end portion 13c is in contact with the valve seat surface 24n.

  Even in such a double container C, the air check valve 13 normally abuts the valve seat surface 24n to close the outside air introduction hole 24k. When 1 is restored, the check valve 13 for air is separated from the valve seat surface 24n and the outside air introduction hole 24k is released, so that only the outer layer body 1 is restored while the inner layer body 2 is reduced in volume. be able to.

  Since the air check valve 13 shown in FIG. 3A is in line contact with the valve seat surface 24n, it may be slightly located between the valve check surface 13 and the valve seat surface 24n depending on the mounting condition and the accuracy of the shape. Gaps may be created. For this reason, it is more preferable that the air check valve 13 is formed long as shown in FIG. 3B so that the distal end portion 13c is along the valve seat surface 24n.

  Further, the double container according to the present invention may be configured as shown in FIG. The double container D of the fourth embodiment shown in FIG. 4A is provided with an air check valve 33 instead of the air check valve 3 with respect to the double container A of the first embodiment. It is provided with an ejection cap 34 instead of the ejection cap 4.

  The pneumatic check valve 33 is a donut type, and the inner edge 33a is formed thicker than the intermediate portion 33b. The tip portion 33c has a bulging shape with a rounded surface. In addition, the check valve 33 for air has the same shape at the top and bottom at the middle in the thickness direction, similarly to the check valve 3 for air.

  The dispensing cap 34 includes a clamping surface 34m and a valve seat surface 34n in place of the clamping surface 4m and the valve seat surface 4n of the dispensing cap 4, while other parts including the top wall 34c and the outside air introduction hole 34k are provided. It has the same shape as the pouring cap 4. The holding surface 34m is located above the holding surface 4m shown in FIG. 1 by an amount corresponding to the increase in the thickness of the inner edge portion 33a. The valve seat surface 34n is located above the holding surface 34m and extends in the same direction (horizontal direction) as the holding surface 34m.

  Also in such a double container D, the outside air introduction hole 34k can be closed or opened by the check valve 33 for air similarly to the double containers A to C described above. Further, since the inner edge 33a of the check valve 33 for air is formed thicker than the intermediate portion 33b, molding with a mold becomes easy. Further, since the rigidity of the inner edge portion 33a is increased, the sandwiching by the ceiling wall 34c can be performed more firmly.

  Further, the double container according to the present invention may be configured as shown in FIG. The double container E of the fifth embodiment shown in FIG. 4 (b) is different from the double container A of the first embodiment in that a check valve 43 for air is provided instead of the check valve 3 for air. It is provided with an ejection cap 44 instead of the ejection cap 4.

  The air check valve 43 is also a donut type, and the inner edge portion 43a is thicker than the intermediate portion 43b. The tip portion 43c has substantially the same thickness as the intermediate portion 43b. Further, the check valve 43 for air also has the same upper and lower shape with the middle in the thickness direction as a boundary.

  The dispensing cap 44 includes a clamping surface 44m and a valve seat surface 44n in place of the clamping surface 4m and the valve seat surface 4n of the dispensing cap 4, while other portions including the top wall 44c and the outside air introduction hole 44k are provided. It has the same shape as the pouring cap 4. Here, the holding surface 44m is located above the holding surface 4m shown in FIG. 1 by an amount corresponding to an increase in the thickness of the inner edge portion 43a. The valve seat surface 34n is located below the holding surface 34m and extends in the same direction (horizontal direction) as the holding surface 34m.

  Also in such a double container E, the outside air introduction hole 44k can be closed or released by the check valve 43 for air. Also, the air check valve 43 has an inner edge portion 43a formed to be thicker than the intermediate portion 43b, similarly to the air check valve 33, so that molding with a mold is easy and rigidity is increased. Thus, the sandwiching by the ceiling wall 44c can be performed more firmly.

  The double container according to the present invention is not limited to the present embodiment, and various changes can be made within the scope according to the claims. For example, the pouring cap of the present embodiment is provided with a cylindrical portion, a lower end thereof is used as an inlet, and a spherical content check valve is provided inside the cylindrical portion. The through hole provided in the ceiling wall may be omitted and the content check valve may be an elastically deformable three-point valve or the like. Further, in the above-described embodiment, the upper end surface of the mouth peripheral wall is covered with the inner layer body, and the check valve for air is sandwiched between the mouth peripheral wall via the inner layer body, but the mouth is not covered with the inner layer body. The air check valve may be directly sandwiched between the upper end surfaces of the peripheral walls. Furthermore, the protrusion provided on the valve seat surface shown in FIG. 2B and the protrusion shown in FIG. 2C may be applied to other embodiments.

1: Outer layer body 1a: Mouth peripheral wall 1b: Concave section 1c: Vent 1d: Projection 2: Inner layer body 3: Check valve for air (check valve)
3a: Inner edge portion 3b: Intermediate portion 3c: Tip portion 4: Pouring cap 4a: Outer peripheral wall 4b: Claw portion 4c: Top wall 4d: Pouring cylinder 4e: Cylindrical portion 4f: Inlet 4g: Reduced diameter portion 4h: Rib 4j: Seal wall 4k: Outside air introduction hole 4m: Nipping surface 4n: Valve seat surface 5: Check valve for contents 6: Lid 6a: Top wall 6b: Outer wall 6c: Finger hook 6d: Seal cylinder 6e: Bar-shaped portion 13: Check valve 13a for air: Inner edge 13b: Intermediate portion 13c: Tip portion 14: Outlet cap 14c: Top wall 14k: Outside air introduction hole 14m: Holding surface 14n: Valve seat surface 14p: Projecting portion 24: Outflow Cap 24c: Top wall 24k: Outside air introduction hole 24m: Holding surface 24n: Valve seat surface 33: Check valve for air 33a: Inner edge portion 33b: Middle portion 33c: Tip portion 34: Discharge cap 34c: Top wall 34k: Outside air Introducing hole 34m: clamping surface 34n: valve seat surface 43: check valve 43 for air : Inner edge 43 b: the intermediate portion 43c: front end portion 44: spout cap 44c: top wall 44k: outside air introduction hole 44m: clamping surface 44n: a valve seat surface A-E: double container S: filling space h: hinge

Claims (9)

An outer layer body having a ventilation port provided on the mouth peripheral wall and having flexibility,
An inner layer body which has a filling space capable of accommodating contents and is deformed to reduce in volume by air introduced between the outer layer body and the vent hole.
A pour cap having a top wall located above the mouth peripheral wall and having an outside air introduction hole communicating with the inlet and the ventilation hole communicating with the filling space,
A double container having a check valve that closes the outside air introduction hole in a state where the outer layer body is pressed and releases the outside air introduction hole in a state where the outer layer body is restored,
A double container holding the check valve sandwiched between an upper end surface of the mouth peripheral wall or the inner layer body covering the upper end surface of the mouth peripheral wall and a back surface of the top wall.   The check valve is of a donut type, and has an inner edge portion sandwiched by the top wall, an elastically deformable intermediate portion located radially outside the inner edge portion, and a radially outer portion located at the radially outside of the intermediate portion. 2. The double container according to claim 1, further comprising: a front end that abuts on a back surface of the top wall to close the outside air introduction hole. 3.   3. The double container according to claim 2, wherein the check valve has a tip portion having a bulging shape. 4.   4. The double container according to claim 2, wherein the check valve has a thicker inner edge portion than the intermediate portion. 5.   3. The double container according to claim 2, wherein the check valve is configured such that the inner edge portion, the intermediate portion, and the distal end portion have a plate shape having substantially the same thickness. 4.   The double container according to any one of claims 2 to 5, wherein the check valve has the same shape at the top and bottom at the middle in the thickness direction.   The double container according to any one of claims 2 to 6, wherein the top wall has a valve seat surface with which the front end portion abuts extends in the same direction as a holding surface that holds the inner edge portion.   The double container according to claim 7, wherein the valve seat surface has a protruding portion that presses against the distal end portion to elastically deform the intermediate portion.   The double wall according to any one of claims 2 to 6, wherein the top wall is inclined downward as the valve seat surface with which the distal end portion abuts radially outward with respect to a sandwiching surface that sandwiches the inner edge portion. container.

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