JP6653638B2 - Aerosol containers and preforms - Google Patents

Description

  The present invention can be formed into a bottle-shaped aerosol container having a cylindrical mouth, a cylindrical body connected to the mouth, and a bottom connected to the lower end of the body, and the aerosol container by blow molding. A preform made of a synthetic resin.

  2. Description of the Related Art Conventionally, aerosol products in which liquid contents such as cosmetics such as hairdressing agents and agents such as pesticides are contained in containers together with propellants have been widely used. An aerosol product has a configuration in which a cap with a valve mechanism is attached to the mouth of an aerosol container filled with high-pressure (higher than atmospheric pressure) propellant gas together with the contents, and a stem provided in the valve mechanism. By pushing in, the contents can be ejected from the stem by the pressure of the injection gas.

  For example, Patent Literature 1 discloses that a valve mechanism is provided at the mouth of an aerosol container formed in a double structure having an outer bottle and a volume-reducible inner bottle by blow-molding a preform having a double structure. An aerosol product is described which has a configuration in which a cap is attached to the inner bottle, the inner bottle is filled with a liquid content, and a propellant gas is filled between the outer bottle and the inner bottle at a high pressure.

JP 2011-251710 A

  In the above-mentioned conventional aerosol product, in order to fill the propellant gas between the outer bottle and the inner bottle of the aerosol container having a double structure, the inner surface of the mouth of the outer bottle is opened at the opening end of the mouth. In addition, a groove-shaped injection gas filling passage extending in the axial direction is provided.

  However, in the above-mentioned conventional aerosol product, only one injection gas filling path is provided on the inner surface of the mouth of the outer bottle, and moreover, the injection gas filling path is provided only within the range of the mouth. Therefore, in the case of using a lamination release type formed by blow molding a double structure preform as an aerosol container, even if the injection gas is injected from the injection gas filling path, the inner bottle is There was a concern that a portion that could not be peeled off from the inner surface of the outer bottle occurred, and it was not possible to fill the container with a specified amount of propellant gas.

  The present invention has been made in view of such problems, and an object thereof is to provide an aerosol container capable of filling a specified amount of a propellant gas by surely separating an inner layer body from an outer layer body by injecting a propellant gas, and An object of the present invention is to provide a preform that can be formed into the aerosol container by blow molding.

  The aerosol container of the present invention is a bottle-shaped aerosol container having a cylindrical mouth, a cylindrical body connected to the mouth, and a bottom connected to the lower end of the body, wherein An outer layer constituting the outer shell of the container, a volume-reducible deformable inner layer laminated releasably on the inner surface of the outer layer, and provided at equal intervals in the circumferential direction on the inner surface of the outer layer, and At least three groove-shaped injection gas filling passages that open at the opening end of the mouth and extend in the axial direction, wherein the width of each of the injection gas filling passages is adjacent to the adjacent injection gas filling passage. And each of the propellant gas filling passages extends to a position below the vertical middle position of the overall height of the aerosol container and not reaching the bottom. .

  The preform of the present invention has a cylindrical mouth, a cylindrical body connected to the mouth, and a bottom connected to the lower end of the body, and is formed into an aerosol container having a predetermined shape by blow molding. A resin preform, wherein the outer preform body constituting the outer shell of the preform, and the outer preform body are formed separately from each other, and arranged so as to overlap the inside of the outer preform body. An inner preform body that covers an inner surface of the outer preform body, and at least three axially extending and axially provided on the inner surface of the outer preform body at equal intervals in a circumferential direction, each opening at an opening end of the mouth. And the groove width of each of the injection gas filling path forming grooves is smaller than the interval between the adjacent injection gas filling path forming grooves. Yes Wherein the propellant gas filling path forming grooves of extends to a position which does not reach the bottom a lower side than the vertically middle position of the entire height of the preform.

  In the preform of the present invention, in the above configuration, it is preferable that the injection gas filling path forming groove extends in the axial direction with a constant groove width.

  In the preform of the present invention, the flange formed at the opening end of the inner preform body is disposed in the annular groove formed at the inner peripheral side of the opening end of the outer preform body. preferable.

  According to the present invention, there is provided an aerosol container capable of filling an injection gas of a specified amount by reliably peeling an inner layer body from an outer layer body by injection of a propellant gas, and a preform capable of being formed into the aerosol container by blow molding. can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which notches and shows a part of container for aerosol which is one Embodiment of this invention. It is sectional drawing which follows the XX line in FIG. FIG. 3A is a cross-sectional view along the line AA in FIG. 2, and FIG. 3B is a cross-sectional view along the line BB in FIG. It is a preform which is one Embodiment of this invention, Comprising: (a) is sectional drawing in alignment with the YY line in FIG. (B), (b) is a half cross section of the preform in front view. FIG. FIG. 5 is a sectional view taken along line CC in FIG.

  Hereinafter, the present invention will be described more specifically with reference to the drawings.

  An aerosol container 1 according to an embodiment of the present invention shown in FIGS. 1 to 3 has a double structure including an outer layer body 2 and an inner layer body 3, and has an outer shape formed in a cylindrical shape. A substantially cylindrical body 6 integrally connected to the mouth 4 via a curved shoulder 5 which is rounded to the mouth 4, and a bottom 7 integrally connected to a lower end of the body 6. It has a bottle shape with

  In this aerosol container 1, a cap (not shown) provided with a valve mechanism is attached to the mouth 4, and the inside of the inner layer body 3 is filled with a liquid content, and a space between the outer layer body 2 and the inner layer body 3 is formed. Is filled with a propellant gas to form an aerosol product. The aerosol product is configured such that the valve mechanism is opened when the stem provided on the cap is pressed down, and the contents are ejected from the stem by the pressure of the propellant gas by pushing down the stem and opening the valve mechanism. be able to. That is, since the inner layer body 3 is pressurized in a direction to reduce its volume by the high-pressure injection gas filled between the outer layer body 2 and the inner layer body 3, when the valve mechanism is opened, the inner layer body 3 is opened. Is reduced in volume by the pressure of the propellant gas, and the contents contained therein are pushed out and injected outward through the stem. The aerosol product using the aerosol container 1 can be used for containing liquid contents such as cosmetics such as a hairdressing agent and chemicals such as a pesticide.

  On the outer peripheral surface of a portion formed by the outer layer body 2 of the mouth portion 4, a ridge 4 a protruding radially outward is provided over the entire periphery. The cap is fixed to the mouth 4 by being wound around the ridge 4a.

  The ridge 4a is provided with a pair of notch grooves 4b extending so as to cut the ridge 4a along the axial direction. Each of the notch grooves 4b is formed in a groove shape having a substantially rectangular cross section, and is disposed at a position facing the center of the mouth 4 with respect to the axis. By providing such a notch groove 4b, when the pressure of the propellant gas filled inside the aerosol container 1 becomes excessively high due to, for example, the aerosol product being left in a high-temperature environment for a long time, the The portion 4 can be deformed into an elliptical shape starting from the pair of notched grooves 4b. Thus, the high-pressure jet gas can escape from between the outer peripheral surface of the mouth portion 4 and the inner peripheral surface of the cap, and the rupture of the aerosol container 1 can be prevented.

  The trunk portion 6 is connected to the shoulder portion 5 with a step, and the lower end portion has a shape that is gradually reduced in diameter. The bottom portion 7 includes a grounding portion 7a that protrudes downward in an annular shape, and a concave portion 7b that is provided inside the grounding portion 7a and that is recessed toward the mouth portion 4 so that the grounding portion 7a is grounded. By doing so, the aerosol container 1 can be arranged in the upright posture.

  The outer layer body 2 forms an outer shell of the aerosol container 1, and can be formed of a synthetic resin material such as polyethylene terephthalate (PET), for example. The outer layer body 2 is formed in a thickness or shape having a predetermined rigidity or strength capable of withstanding the pressure of the injection gas.

  The inner layer 3 is formed in a bag shape thinner than the outer layer 2 by, for example, a synthetic resin material or the like in which polypropylene (PP) and ethylene-vinyl alcohol copolymer resin (EVOH) are blended. It is laminated so that it can be peeled off. The interior of the inner layer body 3 is a storage portion 8 connected to the opening end of the mouth portion 4 and stores therein liquid contents such as the above-mentioned cosmetics such as a hairdressing agent and the above-mentioned chemicals such as a pesticide. can do. Further, the inner layer body 3 can be deformed to have a reduced volume so as to reduce the volume of the housing portion 8 by peeling off from the inner surface of the outer layer body 2.

  As shown in FIGS. 2 and 3, an annular flange 9 protruding radially outward is integrally provided at the open end of the inner layer body 3. Since the flange 9 is disposed so as to contact the lower surface of the annular groove 10 formed on the inner peripheral side of the opening end of the outer layer body 2, the opening end portion of the inner layer body 3 becomes the opening end portion of the outer layer body 2. It is fixed in the positioned state. At the opening end of the mouth 4, the upper end of the outer layer body 2 and the upper end of the inner layer body 3 are formed at the same height without any step.

  On the inner surface of the outer layer body 2, four injection gas filling paths 11 are provided at regular intervals in the circumferential direction around the axis of the aerosol container 1. As shown in FIGS. 2 and 3, the injection gas filling path 11 is formed in a substantially rectangular groove shape having a cross section whose radial dimension is smaller than the circumferential dimension, and is opened at the opening end of the mouth 4. I have. The injection gas filling passage 11 extends in the axial direction (along a virtual plane including the axis of the aerosol container 1) from the open end of the mouth portion 4, and as shown in FIG. It reaches a position below the middle position in the vertical direction and not reaching the bottom 7. Here, the total height of the aerosol container 1 refers to the height from the reference surface to the upper end of the mouth portion 4 when the aerosol container 1 is placed on the reference surface with the mouth 4 upward and the bottom 7 down. That's it. In addition, the portion of the predetermined range from the mouth 4 to the shoulder 5 of the injection gas filling passage 11 is a deep road portion 11a in which the dimension in the radial direction, that is, the depth of the groove is deeper than the portion below the range. I have. Further, the circumferential width dimension, that is, the groove width of these injection gas filling paths 11 is smaller than the circumferential distance between the adjacent injection gas filling paths 11 at any position in the vertical direction. The shapes, lengths, and the like of the four injection gas filling paths 11 are all the same.

  In the present embodiment, four injection gas filling paths 11 are provided on the inner surface of the outer layer body 2. However, the present invention is not limited to this, and if at least three injection gas filling paths 11 are provided, The number can be arbitrarily changed. Further, if the injection gas filling path 11 is formed in a groove shape, its cross-sectional shape and the like can be variously changed.

  An outer seal protrusion 12 and an inner seal protrusion 13 are provided at an open end of the mouth portion 4. The outer seal projection 12 is provided integrally with the opening end of the outer layer body 2 and extends annularly along the opening end radially outside the injection gas filling path 11. The inner seal projection 13 is provided integrally with the opening end of the inner layer body 3 and extends annularly radially inside the injection gas filling path 11 along the opening end. When the cap is attached to the mouth portion 4, the outer seal projection 12 and the inner seal projection 13 abut against the inner surface of the cap, and the injection gas filling path 11 is sealed from the outside air by the outer seal projection 12 and the inner seal projection 13 It is sealed from the storage part 8.

  The aerosol container 1 having such a configuration can fill the contents of the container 8 of the inner layer body 3 through the mouth portion 4, and can form the outer layer body 2 and the inner layer body 3 through the four injection gas filling paths 11. During this time, it is possible to fill the injection gas with a high pressure, that is, a predetermined pressure higher than the atmospheric pressure. The injection gas can be filled through the cap after the cap is attached to the mouth 4 and the cap is temporarily fastened to the mouth 4. In this case, the high-pressure injection gas supplied from the gas supply device is separated into four systems at the cap, and is supplied toward the respective injection gas filling paths 11.

  At this time, the aerosol container 1 is provided with four injection gas filling passages 11 arranged at equal intervals in the circumferential direction, and these injection gas filling passages 11 are respectively connected to the aerosol container 1 from the opening end of the mouth 4. Extends below the middle position in the vertical direction of the overall height and does not reach the bottom 7, so that the injection gas injected into the injection gas filling passage 11 from the opening at the opening end of the mouth 4 At four locations in the direction, the liquid is supplied between the outer layer body 2 and the inner layer body 3 in a wide range from the mouth 4 to a position lower than the vertical middle position of the full height of the aerosol container 1. . Therefore, since the inner layer body 3 can be separated from the inner surface of the outer layer body 2 starting from the wide range, the entire inner layer body 3 can be reliably separated from the outer layer body 2 by injection of the injection gas. Thereby, it is possible to prevent a defective peeling of the inner layer body 3 from the outer layer body 2 and reliably fill the space between the outer layer body 2 and the inner layer body 3 with the specified amount of the propellant gas.

  Also, since the boundary between the mouth 4 and the shoulder 5 is strongly curved, the inner layer 3 is difficult to peel off from the outer layer 2, but the portion extending from the open end of the mouth 4 to the shoulder 5. Is provided with a deeper path portion 11a and the radial dimension of the injection gas filling path 11 in this portion is made larger than in other portions so that more injection gas is supplied. 3 can be reliably separated from the outer layer body 2.

  FIG. 4A is a plan view of a preform 21 according to an embodiment of the present invention, and FIG. 4B is a half sectional view of the preform 21 as viewed from the front. FIG. 5 is a sectional view taken along the line CC in FIG.

  This aerosol container 1 can be formed by blow molding a preform 21 made of a synthetic resin according to an embodiment of the present invention shown in FIG.

  The preform 21 has a double structure including an outer preform body 22 forming the outer layer body 2 and an inner preform body 23 forming the inner layer body 3.

  The outer preform body 22 is formed of the same material as the outer layer body 2, that is, a synthetic resin material such as polyethylene terephthalate, and forms an outer shell of the preform 21. The outer preform body 22 can be formed by, for example, injection molding.

  The inner preform body 23 is made of the same material as the inner layer body 3, that is, a synthetic resin material in which polypropylene (PP) and ethylene-vinyl alcohol copolymer resin (EVOH) are blended. It is formed in a tubular shape. The inner preform body 23 is formed separately from the outer preform body 22 and is incorporated inside the outer preform body 22 to cover the inner surface of the outer preform body 22. Are placed on top of each other. The inner preform body 23 can be formed by, for example, injection molding.

  The outer shape of the preform 21 has a cylindrical mouth 24, a cylindrical trunk 25 connected to the mouth 24, and a lower end of the trunk 25 to close the trunk 25. It has a bottomed tubular shape (substantially test tubular) having a curved (hemispherical) bottom 26.

  The mouth 24 is formed in the same shape as the mouth 4 of the aerosol container 1.

  That is, as shown in FIG. 5, the outer peripheral surface of the portion formed by the outer preform body 22 of the mouth portion 24 is provided with a ridge 24a projecting radially outward over the entire circumference. The ridge 24a is provided with a pair of notch grooves 24b extending so as to cut the ridge 4a along the axial direction. Each of the notch grooves 24b is formed in a groove shape having a substantially rectangular cross section, and is arranged at a position facing the opening portion 24 with the axial center thereof interposed therebetween.

  An annular flange 27 projecting radially outward is provided integrally with the open end portion of the inner preform body 23, and the flange 27 is formed on the inner peripheral side of the open end of the outer preform body 22. It is arranged so as to contact the lower surface of the annular groove 28. Thereby, the opening end portion of the inner preform body 23 can be fixed while being positioned at the opening end portion of the outer preform body 22. At this time, a small gap is formed between the bottom portion of the inner surface of the outer preform body 22 and the lower end of the inner preform body 23, so that the flange 27 reliably contacts the lower surface of the annular groove 28. You can also. Further, a configuration may be employed in which a slight gap is provided between the inner surface of the portion corresponding to the body 25 of the outer preform body 22 and the outer surface of the portion corresponding to the body 25 of the inner preform body 23. . At the opening end of the mouth 24, the upper end of the outer preform body 22 and the upper end of the inner preform body 23 are formed at the same height without any step.

  In the state of the preform 21, the boundary between the mouth portion 24 and the body portion 25 is not clear, but the shape of the mouth portion 24 does not change even after the preform 21 is blow-molded. The body 25 is a part which becomes the mouth part 4 of the container 1 and the body part 25 is extended in the axial and radial directions by blow molding to form a part of the body 6 and the bottom part 7 of the molded aerosol container 1. is there.

  On the inner surface of the outer preform body 22, four injection gas filling path forming grooves 31 are provided at regular intervals in the circumferential direction around the axis of the preform 21. Each of the injection gas filling path forming grooves 31 is formed in a substantially rectangular groove shape whose cross section is smaller in the radial direction than in the circumferential direction, and is open at the opening end of the mouth portion 24. The injection gas filling path forming groove 31 extends in the axial direction from the opening end of the mouth portion 24 to a position below the intermediate position of the entire height of the preform 21 in the vertical direction and to a position not reaching the bottom portion 26. Has reached. Here, the total height of the preform 21 is the height from the reference plane to the upper end of the mouth 24 when the preform 21 is arranged on the reference plane with the mouth 24 as the upper part and the bottom 26 as the lower part. This is the same as the length of the preform 21 in the axial direction. That is, the injection gas filling channel forming groove 31 extends in the axial direction from the opening end of the mouth portion 24, and is located on the bottom portion 26 side of the axially intermediate position of the preform 21 but does not reach the bottom portion 26. Has been reached. The axial lower end position P of the injection gas filling path forming groove 31 is located at a portion formed on the body 6 of the aerosol container 1 after the preform 21 is blow-molded. In the case shown, the lower end position P in the axial direction of the injection gas filling path forming groove 31 is set to be smaller than the gradually decreasing diameter lower end portion of the body 6 of the aerosol container 1 after the preform 21 is blow-molded. Is also on the upper side (the side of the mouth 4). The portion of the predetermined range from the mouth 24 of the injection gas filling path forming groove 31 toward the body 25 is a deep groove having a radial dimension, that is, a groove having a greater depth than a portion below the range. It is a part 31a. Further, the injection gas filling path forming groove 31 extends in the axial direction with a constant circumferential width dimension, that is, the groove width, and the groove width of the injection gas filling path forming groove 31 is any of the vertical direction. Also at the position, the distance between the adjacent injection gas filling path forming grooves 31 in the circumferential direction is narrower. The shapes and lengths of the four grooves 31 for forming the injection gas filling path are all the same.

  In the present embodiment, four injection gas filling path forming grooves 31 are provided on the inner surface of the outer preform body 22, but the present invention is not limited to this, and at least three injection gas filling path forming grooves 31 are provided. Is provided, the number thereof can be arbitrarily changed. Further, if the injection gas filling path forming groove 31 is formed in a groove shape, its cross-sectional shape and the like can be variously changed.

  It is preferable that the injection gas filling path forming groove 31 have a groove width in a range of 2.0 mm to 3.0 mm and a depth of the groove in a range of 0.5 mm to 1.0 mm. In the present embodiment, the groove width of the injection gas filling path forming groove 31 is 2.5 mm, and the groove depth is 0.7 mm. By setting the groove width and the groove depth of the injection gas filling path forming groove 31 within the above ranges, the injection gas filling path 11 of the aerosol container 1 formed by blow molding the preform 21 has an appropriate shape. In addition, it is possible to appropriately fill the propellant gas from the propellant gas filling path 11 toward the space between the outer layer body 2 and the inner layer body 3 as having a flow path area.

  In addition, it is preferable that the axial length of the injection gas filling path forming groove 31 be in a range of 60% to 80% with respect to the entire height of the preform 21, that is, the axial length. In the present embodiment, the axial length of the injection gas filling path forming groove 31 is 70% of the overall height of the preform 21, that is, 70% of the axial length. By setting the axial length of the injection gas filling path forming groove 31 in the above range, in the aerosol container 1 formed by blow molding the preform 21, the injection gas filling path 11 The length can reach the proper position. This prevents the injection gas filling path 11 from reaching the bottom 7 and partially reducing the thickness of the grounding portion 7a, and allows the aerosol container 1 to be grounded without looseness at the grounding portion 7a. Further, it is possible to prevent the aerosol container 1 from being ruptured from the thinned portion when the propellant gas is filled, thereby improving the safety of the aerosol container 1.

  An outer seal projection 32 and an inner seal projection 33 are provided at the open end of the mouth 24. The outer seal projection 32 is provided integrally with the opening end of the outer preform body 22, and extends annularly along the opening end radially outside the injection gas filling path forming groove 31. The inner seal projection 33 is provided integrally with the opening end of the inner preform body 23 and extends annularly along the opening end radially inward of the injection gas filling path forming groove 31. The outer seal projection 32 and the inner seal projection 33 correspond to the outer seal projection 12 and the inner seal projection 13 of the aerosol container 1, respectively.

  By blowing the preform 21 having such a configuration, the aerosol container 1 shown in FIG. 1 can be easily manufactured. As the blow molding, it is preferable to employ biaxial stretching blow molding using a stretching rod while using pressurized air as a pressure medium. However, the preform 21 is molded into the aerosol container 1 shown in FIG. If it is possible, for example, blow molding without using a stretching rod can be adopted.

  The present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Aerosol container 2 Outer layer body 3 Inner layer body 4 Mouth part 4a Ridge 4b Notch groove 5 Shoulder part 6 Body part 7 Bottom part 7a Grounding part 7b Concave part 8 Housing part 9 Flange 10 Annular groove 11 Injection gas filling path 11a Deep part 12 Outer Seal Protrusion 13 Inner Seal Protrusion 21 Preform 22 Outer Preform Body 23 Inner Preform Body 24 Mouth 24a Ridge 24b Notch Groove 25 Body 26 Bottom 27 Flange 28 Annular Groove 31 Injection Gas Filling Channel Forming Groove 31a Deep groove 32 Outer seal projection 33 Inner seal projection P Lower end position

Claims (4)

A bottle-shaped aerosol container comprising a cylindrical mouth, a cylindrical body connected to the mouth, and a bottom connected to the lower end of the body,
An outer layer constituting an outer shell of the aerosol container,
A volume-reducing deformable inner layer body that is releasably laminated on the inner surface of the outer layer body,
At least three groove-shaped injection gas filling paths are provided at equal intervals in the circumferential direction on the inner surface of the outer layer body, each opening at the opening end of the mouth and extending in the axial direction,
While the groove width of each injection gas filling path is smaller than the interval between adjacent injection gas filling paths,
An aerosol container characterized in that each of the propellant gas filling passages extends below an intermediate position in the vertical direction of the overall height of the aerosol container and does not reach the bottom. A synthetic resin preform that has a cylindrical mouth, a cylindrical body connected to the mouth, and a bottom connected to a lower end of the body, and is formed into a predetermined shape aerosol container by blow molding. hand,
An outer preform body constituting an outer shell of the preform,
An inner preform body that is formed separately from the outer preform body and is disposed so as to overlap the inside of the outer preform body and covers the inner surface of the outer preform body.
At least three injection gas filling path forming grooves that are provided at equal intervals in the circumferential direction on the inner surface of the outer preform body and that are each opened at the opening end of the mouth and extend in the axial direction,
The groove width of each of the injection gas filling path forming grooves is smaller than the interval between the adjacent injection gas filling path forming grooves,
The preform, wherein each of the injection gas filling path forming grooves extends below an intermediate position in the vertical direction of the overall height of the preform and extends to a position not reaching the bottom.   The preform according to claim 2, wherein the injection gas filling path forming groove extends in the axial direction with a constant groove width.   The preform according to claim 2, wherein a flange formed at an open end of the inner preform body is disposed in an annular groove formed on an inner peripheral side of an open end of the outer preform body.

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