JP2019116283A - Synthetic resin container - Google Patents

Abstract

To provide a synthetic resin container with a cover properly fitting to the container main body without falling off.SOLUTION: A synthetic resin container 1 with laminated structure consists of a bottle-shaped container main body 10 including a mouth 11 and a body 12, made by blow molding of a laminated preform 100 which is an insert molded article, and a cover 20, blow molded together with the body 12 and laminated on the outside of the body 12. There are a neck ring 13, integrally provided with the container main body 10 between the mouth 11 and the body 12, a flange 21 provided integrally with the cover 20 at the upper end of the cover 20, and attached to a downward face 13a of the neck ring 13 which is facing to the body 12, a dented engaging part 15 arranged on the downward face 13a of the neck ring 13, and a projected engaging part 22 provided to the upper face of the flange 21, which is facing to the neck ring 13, and is to engage the dented engaging part 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a synthetic resin container formed by blow molding a laminated preform which is an insert-molded product.

  As a container for containing liquids such as beverages, food seasonings and cosmetics as contents, synthetic resin containers formed in a bottle shape having a mouth and a body by blow molding a preform are widely used. ing.

  In addition, by using a preform configured to have a laminated structure by insert molding as such a synthetic resin container, a coated portion having a function such as decorativeness or gas barrier property is provided on the outer surface of the body of the container body. There is known one having a stacked structure.

  For example, Patent Document 1 discloses a container body formed of a polyethylene terephthalate resin in the shape of a bottle having a mouth and a body and having a neck ring in a portion between the mouth and the body, and a body A container made of synthetic resin having a laminated structure having a cover made of synthetic resin other than polyethylene terephthalate resin integrally molded by blow molding and laminated on the outer surface of the body and being in close contact with the lower surface of the neck ring Have been described.

Unexamined-Japanese-Patent No. 1-34857

  In the case of the synthetic resin container of Patent Document 1, a flange closely attached to the lower surface of the neck ring of the container main body is integrally provided on the covering portion, and the upper surface of the neck ring and the lower surface of the flange are By holding the flange firmly in direct contact with the mold, the tensile force applied to the coating during blow molding is held by the flange and the coating slips off from the container main body to cause stretching defects. I try to prevent that.

  However, in the case where the container body is made of polyethylene terephthalate resin and the covering portion is made of a material having low adhesion to polyethylene terephthalate resin such as polypropylene resin, for example, the upper surface of the neck ring and the lower surface of the flange are molds. Even if the mold is fixed and held in direct contact with the metal mold, its holding power is not sufficient, and during blow molding, the coated part may slip from the container main body to cause stretching defects, or the coated part There is a problem that when the container after blow molding is filled with the inner solution due to the shift and the container is cooled with shower water, the shower water may intrude between the container body and the covering portion. The

  An object of the present invention is to solve such problems, and it is an object of the present invention to provide a synthetic resin container in which a covering portion is appropriately stretched without falling off the container main body. is there.

  The synthetic resin container of the present invention is drawn by blow molding with a bottle-shaped container body having a mouth and a body by blow molding a laminated preform which is an insert-molded product. A container made of a synthetic resin formed in a laminated structure having a covering portion laminated on the outer surface of the body portion, wherein the container body is provided in a portion between the mouth portion of the container body and the body portion A neck ring integrally provided with the cover, a flange integrally provided on the upper end of the covering portion with the covering portion and in close contact with the lower surface facing the body portion of the neck ring, the lower surface of the neck ring It has a locking recess provided, and a locking projection integrally provided on the upper surface of the flange facing the neck ring and engaged with the locking recess.

  In the synthetic resin container of the present invention, in the above-mentioned configuration, it is preferable that the locking recess is a through hole which vertically penetrates the neck ring.

  In the synthetic resin container of the present invention, in the above configuration, the engagement convex portion is integrally provided at a penetration portion penetrating the engagement recess and at an upper end of the penetration portion, and the opening of the engagement recess is formed. It is preferable to provide a locking piece that is locked to the open end on the side of the part.

  In the synthetic resin container according to the present invention, in the above-mentioned configuration, the locking recess is a notch which is directed radially inward from the outer peripheral edge of the neck ring, and the engaged convex portion fills the notch. Is preferred.

  In the synthetic resin container of the present invention, in the above configuration, a plurality of the locking recesses are provided at equal intervals in the circumferential direction on the lower surface of the neck ring, and a plurality of the objects corresponding to the locking recesses are provided. Preferably, the locking projections are provided at equal intervals in the circumferential direction on the upper surface of the flange.

  In the container made of synthetic resin of the present invention, in the above-mentioned configuration, it is preferable that the container main body is made of a synthetic resin mainly made of polyethylene terephthalate resin, and the covering portion is made of a synthetic resin mainly made of polypropylene resin.

  According to the present invention, it is possible to provide a synthetic resin container in which the covering portion is appropriately stretched without falling from the container body.

BRIEF DESCRIPTION OF THE DRAWINGS It is a half sectional view in the plain view of the synthetic resin container which concerns on one Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the synthetic resin containers shown in FIG. It is sectional drawing in alignment with the AA in FIG. (A), (b) is sectional drawing which shows the modification of arrangement | positioning of the latching recessed part and the to-be-locked protrusion which are shown in FIG. 3, respectively. It is a half cross-sectional view of the lamination | stacking preform used for shaping | molding of the synthetic resin container shown in FIG. It is sectional drawing which shows the state which mounted | worn with the metal mold | die for blow molding the laminated preform shown in FIG. It is sectional drawing which shows the modification of the latching recessed part shown to FIG. 2, and a to-be-locked protrusion. It is sectional drawing which shows the other modification of the latching recessed part shown to FIG. 2, and a to-be-locked protrusion. It is sectional drawing which shows the further another modification of the latching recessed part shown to FIG. 2, and a to-be-locked protrusion. It is sectional drawing in alignment with the BB line in FIG.

  Hereinafter, a synthetic resin container 1 according to an embodiment of the present invention will be described in detail with reference to the drawings.

In the present specification and claims, the vertical direction means the upper side and the lower side in the state where the synthetic resin container 1 is in the upright position as shown in FIG. 1. Further, “radially inside” means a direction going inward along a straight line perpendicular to the center axis O through the center axis O of the synthetic resin container 1 in FIG. 1, and “radially outside” means the center axis O It means a direction toward the outside along a straight line perpendicular to the central axis O.
It shall be.

  The synthetic resin container 1 of the present embodiment shown in FIG. 1 is formed into a laminated structure having a container main body 10 and a covering portion 20 by blow molding a laminated preform which is an insert-molded product.

  In the present embodiment, the container body 10 is made of synthetic resin mainly composed of polyethylene terephthalate resin (PET resin), and the covering portion 20 is made of synthetic resin mainly composed of polypropylene resin (PP resin) .

  The container body 10 is not limited to polyethylene terephthalate resin, and may be made of other synthetic resin such as polyethylene naphthalate resin (PEN), PET-G resin, PCTG resin, PCTA resin, and the like. Moreover, the coating | coated part 20 is not limited to synthetic resin products mainly having a polypropylene resin, For example, a polyethylene terephthalate resin (PET resin), a polyethylene resin (PE resin), ethylene-vinyl alcohol copolymer resin (EVOH resin), nylon It may be made of synthetic resin mainly made of synthetic resin material different from the container main body 10 such as resin (Ny resin), or it may be, for example, "PP resin / adhesive resin / EVOH resin / adhesive resin / PP resin" It is good also as composition of lamination.

  The container body 10 is in the shape of a bottle having a mouth 11 and a body 12. The inside of the container body 10 is a storage space S, and for example, liquids such as beverages, food seasonings and cosmetics can be stored in the storage space S as contents.

  The mouth portion 11 has a substantially cylindrical shape, and constitutes a discharge port of the contents accommodated in the accommodation space S. An external thread 11 a for attaching a cap (not shown) for closing the opening 11 by screw connection is integrally provided on the outer peripheral surface of the opening 11.

  The mouth portion 11 may be configured to have an annular convex portion for mounting the cap by screw connection instead of screw connection.

  The body portion 12 is integrally connected to the lower end portion of the mouth portion 11, and is integrally connected to the lower end portion of the neck portion 12a and the lower end portion of the neck portion 12a which gradually expand in diameter downward; It has a shoulder portion 12b, a substantially cylindrical main portion 12c integrally extending to the lower end of the shoulder portion 12b and extending downward with the same diameter, and a bottom portion 12d closing the lower end of the main portion 12c. .

  In addition, the shape of the trunk | drum 12 can be variously changed, for example, setting it as the shape which is not provided with the neck-like part 12a.

  A neck ring 13 is integrally provided at a portion between the mouth 11 and the body 12 of the container body 10. The neck ring 13 protrudes outward in the radial direction with respect to the upper end portions of the mouth portion 11 and the body portion 12 and has a substantially plate-like shape extending around the central axis O and around the entire circumference. As shown in FIG. 2, the lower surface 13 a facing the body 12 side of the neck ring 13 is a plane substantially perpendicular to the central axis O, and the upper surface 13 b facing the opening 11 of the neck ring 13 is It becomes an inclined surface which inclines so that it may approach the trunk | drum 12 as it goes to radial direction outer side.

  At a portion between the external thread 11a on the outer peripheral surface of the mouth portion 11 and the neck ring 13, an annular protrusion 14 projecting radially outward is integrally provided. The annular projection 14 is a portion to which a band-like portion provided to be breakable in the cap is engaged in order to prevent tampering of the cap attached to the mouth portion 11.

  As shown in FIG. 1, the covering portion 20 is laminated on the outer surface of the barrel 12 of the container body 10 and covers the entire barrel 12. The thickness of the covering portion 20 is thinner than the thickness of the trunk portion 12.

  A flange 21 is integrally provided on the upper end of the covering portion 20. The flange 21 has a substantially plate shape extending radially outward from the upper end of the covering portion 20 and extending all around the center axis O, and is in close contact with the lower surface 13 a of the neck ring 13. In the case shown, the outer diameter of the flange 21 is smaller than the outer diameter of the neck ring 13, but the outer diameter of the flange 21 may be the same as the outer diameter of the neck ring 13. It may be large.

  As shown in FIG. 2, a locking recess 15 is provided on the lower surface 13 a of the neck ring 13. In the present embodiment, the locking recess 15 is configured as a through hole that penetrates the neck ring 13 in the vertical direction. More specifically, the locking recess 15 is a through hole that opens to the lower surface 13a and the upper surface 13b of the neck ring 13, and extends parallel to the central axis O between these openings. The cross-sectional shape of the locking recess 15 is circular, and the inner diameter is constant between the lower surface 13a and the upper surface 13b.

  On the other hand, on the upper surface of the flange 21 facing the neck ring 13, a locked convex portion 22 is integrally provided. The locking convex portion 22 protrudes upward from the upper surface of the flange 21 and engages with the locking recess 15. In the present embodiment, the engagement convex portion 22 has a cylindrical shape with an outer diameter corresponding to the inner diameter of the engagement recess 15 and has a length that does not protrude from the upper surface 13 b of the neck ring 13. It is located inside.

  The engagement convex portion 22 integrally provided on the flange 21 engages with the engagement recess 15 provided on the lower surface 13 a of the neck ring 13, whereby the radial inward movement of the flange 21 relative to the neck ring 13 is achieved. It is regulated.

  A plurality of locking recesses 15 and locking protrusions 22 can be provided. In this case, the plurality of locking recesses 15 are provided on the lower surface 13 a of the neck ring 13 at equal intervals in the circumferential direction, and the plurality of engaged protrusions 22 corresponding to the respective locking recesses 15 are on the upper surface of the flange 21. It is preferable to arrange in the circumferential direction at equal intervals. With such a configuration, the radial inward movement of the flange 21 with respect to the neck ring 13 can be uniformly regulated at each circumferential position.

  In the present embodiment, as shown in FIG. 3, the locking recess 15 and the locking protrusion 22 engaged with the locking recess 15 are respectively provided on both sides of the central axis O of the lower surface 13a of the neck ring 13. ing. However, as shown in FIG. 4A, four locking recesses 15 are provided side by side on the lower surface 13a of the neck ring 13 at every 90 degrees in the circumferential direction, and four engaged recesses 15 corresponding to the respective locking recesses 15 are provided. The stop projections 22 may be arranged on the upper surface of the flange 21 at intervals of 90 degrees in the circumferential direction, and as shown in FIG. 4B, eight locking recesses 15 may be circumferentially provided on the lower surface 13a of the neck ring 13. The configuration may be such that eight lock projections 22 corresponding to the lock recesses 15 are provided on the upper surface of the flange 21 at intervals of 45 degrees in the circumferential direction while being arranged at intervals of 45 degrees in the direction.

  The synthetic resin container 1 shown in FIG. 1 is formed by blow molding a laminated preform which is an insert-molded product. FIG. 5 shows an example of a laminated preform for forming the synthetic resin container 1 of the present embodiment.

  The laminated preform 100 shown in FIG. 5 is formed into a laminated structure including an inner body 110 and an outer body 120 by insert molding.

  An inner body 110 corresponding to the container body 10 is made of polyethylene terephthalate resin, and includes an opening 111 and a body 112.

  The mouth 111 has a substantially cylindrical shape, and an external thread 111a is integrally provided on the outer peripheral surface thereof. On the other hand, the body portion 112 has a bottomed cylindrical shape having an outer diameter substantially the same as that of the mouth portion 111 and a thicker wall thickness than the mouth portion 111, and is integrally connected to the lower end of the mouth portion 111.

  A neck ring 113 is integrally provided at a portion between the mouth 111 and the body 112. The neck ring 113 protrudes outward in the radial direction with respect to the upper end portions of the mouth portion 111 and the body portion 112, and has a substantially plate-like shape extending around the entire central axis O. The lower surface 113a of the neck ring 113 facing the body 112 is a plane substantially perpendicular to the central axis O, and the upper surface 113b of the neck ring 113 facing the opening 111 is radially outward. It becomes an inclined surface which inclines so that the trunk | drum 112 may be approached.

  The outer body 120 which is a portion corresponding to the covering portion 20 is formed in a bottomed cylindrical shape of polypropylene resin, and is laminated on the outer surface of the body portion 112 of the inner body 110 to cover the entire outer surface. The thickness of the outer body 120 is thinner than the thickness of the trunk portion 112, and is preferably 50 μm to 1000 μm, for example.

  A flange 121 is integrally provided at the upper end of the outer body 120. The flange 121 extends substantially radially outward from the upper end of the outer body 120 and extends substantially around the central axis O, and is in close contact with the lower surface 113 a of the neck ring 113.

  A locking recess 115 is provided on the lower surface 113 a of the neck ring 113. In the case illustrated, the locking recess 115 is a through hole that passes through the neck ring 113 in the vertical direction. More specifically, the locking recess 15 opens in the lower surface 113 a and the upper surface 113 b of the neck ring 113 and extends parallel to the central axis O between these openings. The cross-sectional shape of the locking recess 115 is circular, and the inner diameter is always constant between the lower surface 113a and the upper surface 113b.

  A locking convex portion 122 is integrally provided on the upper surface of the flange 121. The locking convex portion 122 protrudes upward from the upper surface of the flange 121 and engages with the locking recess 115. In the present embodiment, the engagement projection 122 has a cylindrical shape with an outer diameter corresponding to the inner diameter of the engagement recess 115, and the engagement recess 115 has a length that does not protrude from the upper surface 113b of the neck ring 113. It is located inside.

  As described above, in the laminated preform 100, the neck of the flange 121 is engaged by engaging the engaged convex portion 122 integrally provided on the flange 121 with the engagement concave portion 115 provided on the lower surface 113 a of the neck ring 113. The radial inward movement of the ring 113 is restricted.

  Here, the opening 111 of the inner body 110 of the laminated preform 100, the neck ring 113, and the locking recess 115 are all portions not drawn by blow molding, and the flange 121 of the laminated preform 100 and the engaged convex portion 122. Is also a portion not drawn by blow molding. Therefore, the shapes of the opening 111, the neck ring 113 and the locking recess 115 of the laminated preform 100 are the same as the shapes of the opening 11 of the container body 10 of the synthetic resin container 1, the neck ring 13 and the locking recess 15, respectively. The shapes of the flange 121 and the engagement convex portion 122 of the laminated preform 100 are the same as the shapes of the flange 21 and the engagement convex portion 22 of the covering portion 20 of the synthetic resin container 1, respectively. There is.

  On the other hand, the body portion 112 of the laminated preform 100 is a portion which is drawn by blow molding and formed on the body portion 12 of the container body 10. In addition, the outer body 120 of the laminated preform 100 is a portion formed in the covering portion 20 which is drawn by blow molding together with the body portion 112 and is laminated on the outer surface of the body portion 12.

  The laminated preform 100 having the above configuration is an insert-molded product formed by insert molding. For example, the laminated preform 100 can be formed by insert molding (injection molding) using the inner body 110 formed by injection molding in advance as an insert, or the outer body 120 formed by injection molding in advance is used as the insert It can be formed by insert molding (injection molding).

  That is, when forming the laminated preform 100 by insert molding, the mouth 11 of the synthetic resin container 1, the neck ring 13, the locking recess 15, the flange 21, and the locked protrusion 22 respectively inject the synthetic resin material It is a portion formed by molding.

  The laminated preform 100 is molded into the synthetic resin container 1 by blow molding using a blow molding die 130 as shown in FIG. 6, for example.

  The mold 130 has an annular support surface 131 having a diameter corresponding to the neck ring 113 to the flange 121, and the laminated preform 100 is mounted on the mold 130 with the flange 121 in contact with the support surface 131. . In this state, the mouth portion 111 is exposed to the outside of the mold 130, and the body portion 112 and the outer body 120 of the inner body 110 are disposed inside the cavity 132 of the mold 130. Further, the outer peripheral surface of the body portion 112 and the outer body 120 in the vicinity of the neck ring 113 does not contact the inner surface of the mold 130, and has a gap between the outer surface and the inner surface.

  In the illustrated case, the mold 130 is configured so that the laminated preform 100 is mounted in an inverted posture with the mouth 111 facing downward, but the laminated preform 100 has a positive shape with the mouth 111 facing upward. It can also be configured to be mounted in a standing position.

  A blow nozzle (not shown) is engaged with the opening 111 from the lower side in the drawing, and a blow molding is performed by supplying a pressurized medium such as air or the like to the inside of the laminated preform 100 through the blow nozzle. The body 112 and the outer body 120 of the laminated preform 100 are stretched. In the blow molding, a pressure medium is supplied to the inside of the body 112 while the body 112 and the outer body 120 are axially extended by a stretching rod (not shown), and the body 112 and the outer body 120 are made radially. It is also possible to employ biaxial stretch blow molding for stretching.

  When blow molding the laminated preform 100 having the above configuration using such a mold 130, the flange 121 is sandwiched between the neck ring 113 and the support surface 131 by the pressure that the blow nozzle presses the opening 111. Then, the mold 130 is held by the mold 130 and the radial inward movement of the neck ring 113 is restricted.

  Further, in addition to this, the laminated preform 100 has a configuration in which the engagement convex portion 122 integrally provided to the flange 121 is engaged with the engagement concave portion 115 provided on the lower surface 113 a of the neck ring 113 Thus, the radial inward movement of the held flange 121 of the mold 130 with respect to the neck ring 113 can be further strongly restricted.

  Therefore, when the body 112 and the outer body 120 are stretched in the axial direction and the radial direction by blow molding, even if the outer body 120 is subjected to a tensile force in the direction away from the neck ring 113, While the flange 121 is held in close contact with the neck ring 113 without moving inward in the radial direction, the outer body 120 slips off from the body portion 112 of the inner body 110, resulting in defective extension of the outer body 120 in blow molding. This can be prevented from occurring. Therefore, the container 1 made of synthetic resin having the configuration as described above can be appropriately stretched without the covering portion 20 falling from the container main body 10.

  Further, in the present embodiment, the locking recess 115 is configured as a through hole that passes through the neck ring 113 up and down, and the locking protrusion 122 is a cylindrical shape having an outer diameter corresponding to the inner diameter of the locking recess 115. As a configuration in which the locking convex portion 122 is disposed within the locking recess 115 with a length that does not protrude from the upper surface 113 b of the neck ring 113 as a The radial inward movement of the held flange 121 of the mold 130 with respect to the neck ring 113 can be more strongly restricted. Therefore, the container 1 made of synthetic resin having the above-described configuration can be more reliably stretched appropriately without the covering portion 20 falling from the container body 10.

  Furthermore, as shown in FIG. 4, a plurality of locking recesses 15 are provided on the lower surface 13 a of the neck ring 13 at equal intervals in the circumferential direction, and a plurality of locking projections 22 corresponding to the respective locking recesses 15. By arranging in the upper surface of the flange 21 at equal intervals in the circumferential direction, the radially inward movement of the flange 21 with respect to the neck ring 13 can be uniformly regulated at each position in the circumferential direction. As a result, the synthetic resin container 1 can be more reliably stretched appropriately without the covering portion 20 falling from the container body 10.

  Furthermore, according to the synthetic resin container 1 having the configuration as described above, the container body 10 to the inner body 110 are made of a synthetic resin mainly composed of polyethylene terephthalate resin, and the covering portion 20 to the outer body 120 is a polypropylene resin So that the radial inward movement of the held flange 121 of the mold 130 with respect to the neck ring 113 is surely restricted. 1 can be appropriately stretched without the covering portion 20 falling from the container body 10.

  Furthermore, when blow molding laminated preform 100 using mold 130, the outer peripheral surface of barrel 112 and outer body 120 in the vicinity of neck ring 113 does not contact the inner surface of mold 130, and Since there is a gap between them, generation of burrs in the neck portion 12a of the synthetic resin container 1 can be prevented by blow molding.

  7 is a cross-sectional view showing a modification of the locking recess and the locked projection shown in FIG. 2, and FIG. 8 is a cross-sectional view showing another modification of the locking recess and the locked projection shown in FIG. It is. 9 is a cross-sectional view showing still another modified example of the locking recess and the locked projection shown in FIG. 2, and FIG. 10 is a cross-sectional view taken along the line B-B in FIG. In FIGS. 7 to 10, the members corresponding to the members described above are denoted by the same reference numerals.

  The engagement recess 15 and the engagement projection 22 of the synthetic resin container 1 are not limited to the shape shown in FIG. 2, and may be of a shape that can restrict the radial inward movement of the flange 21 with respect to the neck ring 13. For example, it can be changed to various shapes.

  For example, as shown in FIG. 7, the locking recess 15 is configured as a through hole that penetrates the neck ring 13 up and down, and the upper surface 13 b of the neck ring 13 is recessed downward with respect to the upper surface 13 b. A step surface 13c larger than the opening end of the locking recess 15 is opened in the step surface 13c at the opening 11 side of the opening 11 of the locking recess 15, and a through portion passing through the locking recess 15 22a and a locking piece 22b integrally provided at the upper end of the through portion 22a and locked to the opening end of the locking recess 15, ie, the step surface 13c. According to this configuration, the locking piece 22b is locked to the step surface 13c and functions as an anchor, so that the locking piece 22b reliably prevents detachment of the locked convex portion 22 from the locking recess 15 Can. Therefore, the radial inward movement of the flange 21 with respect to the neck ring 13 is further strongly restricted, and the synthetic resin container 1 is more properly stretched properly without falling off the covering portion 20 from the container main body 10. It can be

  Further, as shown in FIG. 8, the locking recess 15 can be formed as a recess which does not penetrate the neck ring 13 in the vertical direction but opens only on the lower surface 13 a of the neck ring 13. The shape of the recess in this case may be variously modified if it is recessed upward with respect to the lower surface 13 a of the neck ring 13, such as a circular, rectangular, polygonal recess or a hemispherical recess in cross section. is there. Further, in this case, as shown in the drawing, the locked convex portion 22 is disposed inside the locking concave portion 15 so as to fill the entire inside of the concave portion of the locking concave portion 15. According to this configuration, the covering portion 20 is made of the synthetic resin container 1 without reducing the appearance of the synthetic resin container 1 by preventing the locking concave portion 15 and the locking convex portion 22 from being visually recognized from the outside. It can be appropriately stretched without falling off the container body 10.

  Furthermore, as shown in FIG. 9 and FIG. 10, the locking recess 15 is configured as a notch in which the neck ring 13 is recessed inward in the radial direction from the outer peripheral edge thereof, and the locked convex portion 22 is the notch Can be configured to fill in the In this case, the notch shape of the locking recess 15 in a plan view shown in FIG. 10 is not limited to the substantially rectangular shape as illustrated, but may be various shapes such as a substantially semicircular shape. According to this configuration, the covering portion 20 can be easily peeled off from the trunk portion 12 of the container main body 10 by holding the engagement convex portion 22 with a finger and pulling it down with respect to the neck ring 13. When discarding the container 1 after use, the container body 10 and the covering portion 20 can be easily separated.

  Also in the modification shown in FIGS. 7 to 10, as in the case shown in FIG. 2, it is also possible to provide only one locking recess 15 and one locked protrusion 22 in the neck ring 13 and the flange 21, respectively. Alternatively, the plurality of locking recesses 15 may be arranged in the neck ring 13 at equal intervals in the circumferential direction, and the plurality of engaged protrusions 22 corresponding to the respective locking recesses 15 may be equally spaced in the circumferential direction on the flange 21 Can be arranged side by side.

  It is needless to say that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, the locking recess 15 has a portion that is recessed upward with respect to the lower surface 13a of the neck ring 13, and the locking convex portion 22 is locked to radially inward of the flange 21 relative to the neck ring 13. Not only the above-described shape, but the shape can be variously modified as long as the movement of can be restricted.

  Further, as long as the engagement convex portion 22 can also be engaged with the engagement recess 15 to restrict the radial inward movement of the flange 21 with respect to the neck ring 13, the shape is not limited to the above. It can be changed.

Synthetic resin container 1
Container body 10
Mouth 11
Male screw 11a
Torso 12
Neck 12a
Shoulder 12b
Body part 12c
Bottom portion 12d
Neck ring 13
Lower surface 13a
Top surface 13b
Stepped surface 13c
Annular projection 14
Locking recess 15
Cover 20
Flange 21
Locked convex portion 22
Penetration part 22a
Locking piece 22b
Laminated preform 100
Inner body 110
Mouth 111
Male thread 111a
Torso 112
Neck ring 113
Lower surface 113a
Top surface 113b
Locking recess 115
Outer body 120
Flange 121
Locked convex part 122
Mold 130
Support surface 131
Cavity 132
Central axis O
Housing space S

Claims (6)

By blow-molding a laminated preform which is an insert-molded product, it is drawn by blow molding together with a bottle-shaped container body having an opening and a body, and the body and laminated on the outer surface of the body. A container made of synthetic resin formed in a laminated structure having a coated portion,
A neck ring provided integrally with the container body at a portion between the mouth of the container body and the body;
A flange integrally provided on the upper end of the covering portion with the covering portion and in close contact with the lower surface facing the body portion of the neck ring;
A locking recess provided on the lower surface of the neck ring;
A synthetic resin container, comprising: a locking convex portion integrally provided on an upper surface of the flange facing the neck ring and engaged with the locking concave portion.   The synthetic resin container according to claim 1, wherein the locking recess is a through hole vertically penetrating the neck ring.   The engagement convex portion is integrally provided at a penetration portion penetrating the engagement recess and an upper end of the penetration portion, and is engaged at an opening end of the engagement recess on the side of the mouth portion The synthetic resin container according to claim 2, comprising a piece.   The synthetic resin container according to claim 1, wherein the locking recess is a notch that is directed radially inward from the outer peripheral edge of the neck ring, and the locked convex portion fills the notch.   A plurality of the locking recesses are provided at equal intervals in the circumferential direction on the lower surface of the neck ring, and a plurality of the locking protrusions corresponding to the respective locking recesses are circumferentially provided on the upper surface of the flange The container made of a synthetic resin according to any one of claims 1 to 4, which is provided side by side at equal intervals in a direction.   The synthetic resin container according to any one of claims 1 to 5, wherein the container body is made of a synthetic resin mainly made of polyethylene terephthalate resin, and the covering portion is made of a synthetic resin mainly made of polypropylene resin. .

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