JP6716341B2 - Double container - Google Patents

Description

The present invention includes a flexible outer layer body and a volume-deformable inner layer body that is housed inside the outer layer body. By pressing the outer layer body, the contents stored in the inner layer body are poured out. Regarding heavy containers.

As a container for storing cosmetics such as lotion, shampoo, rinse or liquid soap, and food seasoning, a flexible outer layer body and a volume-deformable inner layer body housed inside the outer layer body There is known a double container (also referred to as a delamination container) that is provided with and that presses the outer layer body to pour out the contents contained in the inner layer body. The outer layer body of such a double container is provided with vent holes (through holes, slits, etc.) penetrating the front and back sides, and when the pressed outer layer body is restored, the outer layer body and the inner layer body are mutually passed through the vent holes. Air can be taken in between. As a result, only the outer layer body can be restored while the volume deformation of the inner layer body is being performed.

As such a double container, for example, in Patent Document 1, an outer layer body having a vent hole in a peripheral wall of a mouth portion, a pouring cap attached to the outer layer body and having an outside air introducing hole connected to the vent hole, and a pouring cap And a check valve that closes the outside air introduction hole during normal operation and releases the outside air introduction hole when the outer layer body is restored and a negative pressure is created between the outer layer body and the inner layer body. It is shown. Further, this double container is provided with an inner plug covering the upper opening of the outer layer body inside the pouring cap, and the check valve is held by being sandwiched between the pouring cap and the inner plug.

JP, 2013-151316, A

By the way, in recent years, from the viewpoints of environmental consideration and cost reduction, efforts are being actively made to reduce the number of parts as much as possible, and reduction of the number of parts is demanded even in such a double container.

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

The present invention has a flexible outer layer body having a vent hole in the mouth peripheral wall,
An inner layer body that has a filling space capable of accommodating contents and is deformed and reduced in volume by air introduced between the outer layer body and the vent hole,
A pouring cap having a ceiling wall located above the mouth peripheral wall and having an introduction port communicating with the filling space and an outside air introducing hole communicating with the ventilation port,
A double container having a check valve that closes the outside air introduction hole in a state of pressing the outer layer body and releases the outside air introduction hole in a state in which the outer layer body is restored,
The inner layer body is laminated with the outer layer body above the vent hole of the mouth peripheral wall,
The check valve is a thin piece integrally formed with the outer layer body and the inner layer body at an upper outer end of the mouth peripheral wall in a state where the outer layer body and the inner layer body are stacked .

In the thin piece, an intermediate portion provided between a connecting portion integrally connected to at least one of the outer layer body and the inner layer body and a tip end portion abutting the back surface of the ceiling wall has a linear shape, a curved shape, or It is preferably bent.

The tip portion preferably extends along the back surface of the top wall.

The tip portion is preferably thicker than the intermediate portion.

The check valve according to the present invention is a thin piece that is integrally connected to at least one of the outer layer body and the inner layer body, and is not held by being sandwiched between the spout cap and the inner plug as in the conventional case. That is, the number of parts can be reduced because the inner plug used in the conventional double container is not required.

It is sectional drawing and the partial expanded sectional view which show 1st embodiment of the double container according to this invention. It is a partial expanded sectional view showing a second embodiment of a double container according to the present invention. It is a partial expanded sectional view showing a third embodiment of a double container according to the present invention. It is a partial expanded sectional view showing a fourth embodiment of a double container according to the present invention.

Hereinafter, the present invention will be described more specifically with reference to the drawings. In the present specification, the claims, and the abstract, “upper” and “lower” refer to the orientation of the double container placed on a horizontal plane (upright posture).

In FIG. 1, reference numeral A indicates a first embodiment of the double container according to the present invention. The double container A includes an outer layer body 1, an inner layer body 2, a check valve (check valve for air) 3, a pouring cap 4, a check valve for contents 5, and a lid body 6.

The outer layer body 1 is made of a synthetic resin, and has a flexible cylindrical bottomed body (not shown) connected to the cylindrical mouth peripheral wall 1a, and is formed into a bottle shape as a whole. 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 the portion where the recess 1b is provided. Further, on the outer peripheral surface of the mouth portion peripheral wall 1a, a protrusion 1d that protrudes radially outward is provided below the vent hole 1c.

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

The check valve 3 for air is a thin piece (burr-like) integrally connected to at least one of the outer layer body 1 and the inner layer body 2. As shown in the partially enlarged view of FIG. 1, the check valve 3 for air of the present embodiment is formed by stacking an outer layer body 1 and an inner layer body 2. That is, the check valve 3 for air is integrally connected to both the outer layer body 1 and the inner layer body 2. Further, the check valve 3 for air has a connecting portion 3a integrally connected to both the outer layer body 1 and the inner layer body 2, an elastically deformable intermediate portion 3b located radially outside the connecting portion 3a, and an intermediate portion 3b. And a tip portion 3c located on the outer side in the radial direction. The intermediate portion 3b of the present embodiment has a linear shape that inclines upward as it extends radially outward. The intermediate portion 3b and the tip portion 3c are formed to have substantially the same thickness.

The outer layer body 1 and the inner layer body 2 provided with such a check valve 3 for air can be formed by, for example, blow molding. Specifically, a synthetic resin material that forms the outer layer body 1 and a synthetic resin material that forms the inner layer body 2 are selected to have low mutual compatibility, and then a cylindrical parison in a laminated state is formed. prepare. Further, as a split mold for blow molding, a minute space for forming a thin check valve 3 for air is provided at a portion forming an upper outer end of the peripheral wall 1a of the mouth portion. The parison should be eaten away outside the minute space. As a result, the air check valve 3 can be formed at the upper outer end of the mouth peripheral wall 1a. In such a parison, a synthetic resin material forming the outer layer body 1 and a synthetic resin material forming the inner layer body 2 are continuously extruded to be laminated evenly in the length direction. Therefore, the check valve 3 for air is in a state in which the outer layer body 1 and the inner layer body 2 are laminated, but by pushing out only one of them at a predetermined timing, the laminated portion becomes intermittent in the longitudinal direction. The parison formed may be used, and in this case, the check valve 3 for air may be configured by either the outer layer body 1 or the inner layer body 2. In addition, a test tubular 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 biaxial stretch blow molding is performed on the preform. It can also be formed.

The spout cap 4 includes a cylindrical outer peripheral wall 4a surrounding the mouth peripheral wall 1a. On the inner surface of the outer peripheral wall 4a, a claw portion 4b that engages with the protrusion 1d and prevents the pouring cap 4 from coming off and holding it is provided. The outer layer body 1 and the pouring cap 4 may be screw-coupled with each other by providing a male screw or a female screw in place of the protrusion 1d and the claw portion 4b.

A plate-shaped ceiling wall 4c is provided on the upper end of the outer peripheral wall 4a. On the top wall 4c, a spout cylinder 4d which is erected upward and whose distal end portion is curved radially outward to form a lip, and a cylindrical shape which extends downward from the inner surface of the spout cylinder 4d. The tubular portion 4e and the inlet 4f that opens at the lower end of the tubular portion 4e and communicates with the filling space S are provided. At the lower part of the tubular portion 4e, a reduced diameter portion 4g having a diameter that decreases downward is provided. Further, the inner surface of the tubular portion 4e is provided with a rib 4h whose upper portion is curved inward in the radial direction.

A seal wall 4j that prevents the contents from leaking from the filling space S by sandwiching the inner layer body 2 with the outer layer body 1 is provided on the radially outer side of the tubular portion 4e.

Further, on the outside of the seal wall 4j, a through hole (outside air introduction hole) 4k is provided above the air check valve 3 so as to vertically pass through the ceiling wall 4c. The tip 3c of the check valve 3 for air is in contact with the back surface of the ceiling wall 4c on the radially outer side of the outside air introducing hole 4k, thereby closing the outside air introducing hole 4k.

The check valve 5 for contents has a spherical shape and is provided so as to be movable in the cylindrical portion 4e. As shown in FIG. 1, 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. This prevents contact between the contents in the filling space S and the outside air. The check valve 5 for contents shown by the chain double-dashed line shows a state in which the check valve 5 for contents has moved upward with the lid body 6 closed.

The lid 6 includes a plate-shaped 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. Further, on the outer wall 6b, on the side opposite to the side on which the hinge h is provided, a finger hooking portion 6c having a shape that extends in the horizontal direction and serving as a portion to which a finger is applied when opening and closing is provided. Alternatively, the hinge h may be omitted, and the pouring cap 4 and the lid 6 may be separated, and the lid 6 may be held by screw connection.

On the back surface of the top wall 6a, a cylindrical seal cylinder 6d that abuts the inner peripheral surface of the cylindrical portion 4e when the cover body 6 is closed, and a cover body 6 located inside the seal cylinder 6d in the radial direction, There is provided a rod-shaped portion 6e which prevents the check valve 5 for contents from coming out of the cylindrical portion 4e in the closed state.

When pouring out the contents from the double container A having such a structure, after opening the lid body 6, the outer layer body 1 is changed from the upright posture to the tilted posture so that the outer layer body 1 is not shown. Press the body of. 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 tubular portion 4e from the introduction port 4f and are poured. The contents are poured out from the outlet cylinder 4d. Since the tip 3c of the check valve 3 for air contacts the back surface of the top wall 4c of the spout cap 4 and the outside air introduction hole 4k is closed, the space between the outer layer body 1 and the inner layer body 2 is reduced. The air present in the air will not leak out from the outside air introduction hole 4k.

When the pressing of the outer layer body 1 against the body is released after the contents have been poured out, the outer layer body 1 tries to return to its original shape by its own restoring force, so that the outer layer body 1 and the inner layer body 2 are separated from each other. Becomes negative pressure. Then, the intermediate portion 3b of the check valve 3 for air is elastically deformed by the outside air pressure, the tip portion 3c is separated from the back surface of the ceiling wall 4c, and the outer layer body 1 and the inner layer body 2 are separated from each other through the outside air introduction hole 4k. Air is taken in between each other. Thereby, only the outer layer body 1 can be restored while the inner layer body 2 is deformed and reduced in volume.

Next, a second embodiment of the double container according to the present invention will be described with reference to FIG. The double container B shown in FIG. 2 is different from the double container A described above in that an air check valve 13 is provided in place of the air check valve 3.

The check valve 13 for air is configured in a state in which the outer layer body 1 and the inner layer body 2 are stacked, similarly to the above-described air check valve 3. In the check valve 13 for air, an intermediate portion 13b located between a connecting portion 13a integrally connected to both the outer layer body 1 and the inner layer body 2 and a tip end portion 13c abutting on the back surface of the ceiling wall 4c is shown in FIG. As shown in, the curved shape is convex downward. That is, since the check valve for air 13 can have a longer overall length than the check valve for air 3, the tip portion 13c can be brought into contact with the back surface of the ceiling wall 4c with a lower elastic force even if the check valve for air 3 has the same thickness. Can be contacted.

Further, the double container according to the present invention may employ a double container C as shown in FIG. The double container C is obtained by replacing the above-described air check valve 3 with an air check valve 23.

The check valve 23 for air is configured in a state where the outer layer body 1 and the inner layer body 2 are stacked, similarly to the above-described check valve 3 for air. Further, as shown in FIG. 3, the intermediate portion 23b located between the connecting portion 23a integrally connected to both the outer layer body 1 and the inner layer body 2 and the tip portion 23c that abuts on the back surface of the ceiling wall 4c has a radial direction as shown in FIG. The bent shape is such that the outer lower part projects. Also in such an air check valve 23, the total length can be made longer than that of the air check valve 3. Further, since the tip portion 23c extends radially outward along the back surface of the ceiling wall 4c, the tip portion 23c can be brought into surface contact with the back surface of the ceiling wall 4c. As a result, the outside air introduction hole 4k can be closed more stably than the check valve 3 for air, the tip of which makes a line contact with the back surface of the ceiling wall 4c.

Further, the double container according to the present invention may be a double container D as shown in FIG. The double container D replaces the above-described air check valve 3 with an air check valve 33.

The air check valve 33 is also configured in a state in which the outer layer body 1 and the inner layer body 2 are stacked, similarly to the air check valve 3 described above. Further, the intermediate portion 33b has a linear shape extending in the horizontal direction from the connecting portion 33a, and a tip portion 33c extending upward is connected to the outer edge thereof. Here, the tip portion 33c is formed thicker than the intermediate portion 33b. By making the tip portion 33c thick as described above, it is possible to more reliably prevent the distribution and the deformation when the spout cap 4 is attached.

The double container according to the present invention is not limited to this embodiment, and various modifications can be made within the scope according to the claims. For example, in a check valve for air, the specifications in which the front end portion is thicker than the intermediate portion are not limited to those having a curved intermediate portion as shown in FIG. 3 and a curved portion as shown in FIG. It may be applied to those having an intermediate portion of the shape. Further, the above-mentioned pouring cap is provided with a tubular portion, the lower end of which serves as an inlet and a spherical check valve for contents inside the tubular portion, but the tubular portion is omitted, for example. The through hole provided in the top wall may be used as the inlet, and the content check valve may be in the form of a three-point valve that is elastically deformable.

1: Outer layer body 1a: Portion peripheral wall 1b: Recessed portion 1c: Vent hole 1d: Protrusion 2: Inner layer body 3: Check valve (check valve for air)
3a: Connection part 3b: Intermediate part 3c: Tip part 4: Discharge cap 4a: Outer peripheral wall 4b: Claw part 4c: Top wall 4d: Discharge cylinder 4e: Cylindrical part 4f: Inlet port 4g: Reduced diameter part 4h: Rib 4j: Seal wall 4k: Outside air introduction hole 5: Check valve for contents 6: Lid body 6a: Top wall 6b: Outer wall 6c: Finger hook 6d: Seal tube 6e: Bar-shaped portions 13, 23, 33: Reverse for air Stop valves 13a, 23a, 33a: Connection parts 13b, 23b, 33b: Intermediate parts 13c, 23c, 33c: Tip parts A, B, C, D: Double container S: Filling space h: Hinge

Claims (4)

An outer layer body having a vent hole in the mouth peripheral wall and having flexibility,
An inner layer body that has a filling space capable of accommodating contents and is deformed and reduced in volume by air introduced between the outer layer body and the vent hole,
A pouring cap having a ceiling wall located above the mouth peripheral wall and having an introduction port communicating with the filling space and an outside air introducing hole communicating with the ventilation port,
A double container having a check valve that closes the outside air introduction hole in a state of pressing the outer layer body and releases the outside air introduction hole in a state in which the outer layer body is restored,
The inner layer body is laminated with the outer layer body above the vent hole of the mouth peripheral wall,
The check valve is a double container which is a thin piece integrally formed with the outer layer body and the inner layer body at an upper outer end of the mouth peripheral wall in a state where the outer layer body and the inner layer body are stacked . In the thin piece, an intermediate portion provided between a connecting portion integrally connected to at least one of the outer layer body and the inner layer body and a tip end portion abutting the back surface of the ceiling wall has a linear shape, a curved shape, or The double container according to claim 1, which has a bent shape. The double container according to claim 2, wherein the tip portion extends along the back surface of the ceiling wall. The double container according to claim 2 or 3, wherein the tip portion is thicker than the intermediate portion.

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