JP2019119478A - Synthetic resin container, preform, and manufacturing method of synthetic resin container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin container, a preform, and a method for manufacturing a synthetic resin container capable of suppressing the residual of the contents in the inner layer when the contents are used up until they cannot be poured. SOLUTION: The synthetic resin container 1 of the present invention is a synthetic resin container 1 having an outer layer body 2 and an inner layer body 3 releasably laminated on the inner surface of the outer layer body 2, and has a tubular mouth portion. 4, a body portion 5 connected to the mouth portion 4, and a bottom portion 6 for closing the lower end of the body portion 5 are provided, and the outer layer body 2 and the inner layer body 3 are surrounded by an adhesive band 10 extending in the vertical direction in the body portion 5. A part of the direction is adhered, and the body portion 5 is characterized in that the outer layer body 2 and the inner layer body 3 are formed by stretch blow molding together with the adhesive band 10. [Selection diagram] Fig. 1

Description

  The present invention relates to a synthetic resin container comprising an outer layer body and an inner layer body laminated in a peelable manner on the inner surface of the outer layer body, a preform used for blow molding of a synthetic resin container, and a synthetic resin container. On the way.

  A conventional peeling container, also called a delamination container (delamination container), as a container for containing food seasonings such as soy sauce and beverages, cosmetics such as lotions, shampoos and rinses, and toiletries such as liquid soap as content liquids. Are known (see, for example, Patent Document 1).

  Such a laminated peeling container has a cylindrical opening, a body connected to the opening, and a bottom closing the lower end of the body, and the inner space of the outer layer forming the outer shell of the container contains the content liquid storage space A dual-layer structure in which a volume-reducing deformable inner layer body is peelably stacked is combined with, for example, a squeeze type dispensing container or pump combined with a dispensing cap having a check valve. Used as a pumpable container. In this case, the contents liquid can be poured out by squeezing (squeezing) the body of the outer layer body or operating the pump, while the outside air introduction hole provided in the outer layer body after pouring out By introducing external air between the inner layer and the outer layer, the outer layer can be restored to its original shape while reducing the volume of the inner layer. As described above, in the laminated peeling container, the content liquid contained in the inner layer can be poured out without being replaced with the outside air, so the contact of the outside air with the content liquid contained inside the inner layer is reduced. , And its deterioration and deterioration can be suppressed.

  The above-mentioned peeling container is, for example, a synthetic resin material for an olefin-based outer layer body such as polypropylene (PP) or polyethylene (PE), and nylon or ethylene-vinyl alcohol having low compatibility with the synthetic resin material for the outer layer body. A tubular parison having a laminated structure in which the inner body is laminated on the inside of the outer body is formed by co-extrusion with a synthetic resin material for the inner layer body such as a copolymer resin (EVOH), and this parison is made of gold. It can be manufactured by blow molding in a mold.

JP, 2012-116516, A

  By the way, in the pouring container using the laminated peeling container, when the inner layer peels from the outer layer and irregularly reduces the volume as the contents liquid is poured out, the inner surface of the inner layer between the mouth and the bottom portion There is a possibility that the content operation can not be carried out until the end of the operation because the operation of the liquid injection is narrowed or the liquid injection path is narrowed or blocked. was there.

  The present invention has been made in view of such problems, and its object is to regulate the peeling of the inner layer body, and the remaining of the contents in the inner layer body when the contents are used up until it becomes impossible to pour out. An object of the present invention is to provide a method for manufacturing a synthetic resin container, a preform, and a synthetic resin container which can be suppressed.

The synthetic resin container of the present invention is
A synthetic resin container comprising an outer layer body and an inner layer body laminated in a peelable manner on the inner surface of the outer layer body,
With a cylindrical mouth,
A body connected to the mouth;
And a bottom portion closing the lower end of the body portion,
The outer layer body and the inner layer body are partially adhered in the circumferential direction by an adhesive band extending in the vertical direction in the body portion,
The body portion is formed by stretch blow molding the outer layer body and the inner layer body together with the adhesive band.

  In the container made of synthetic resin of the present invention, in the above-mentioned configuration, preferably, the outer layer body and the inner layer body are mainly made of polyethylene terephthalate.

  Further, in the synthetic resin container of the present invention, in the above-mentioned configuration, the adhesive band is preferably made of a hot melt material having a polyester resin.

  Further, in the synthetic resin container of the present invention, in the above configuration, the outer layer body has an outside air introducing hole for introducing the outside air into a space between the outer layer body and the inner layer body, and the outside air introducing hole is It is preferable to arrange | position in the position which does not overlap with the said adhesive zone in the circumferential direction.

  Further, in the container made of synthetic resin according to the present invention, in the above-mentioned configuration, it is preferable that the adhesive band is provided at two opposing positions in the circumferential direction.

Also, the preform of the present invention is
A synthetic resin preform having an outer body and an inner body laminated on the inner surface of the outer body and used for stretch blow molding,
With a cylindrical mouth,
A body connected to the mouth;
And a bottom portion closing the lower end of the body portion,
An adhesive sheet extending in the vertical direction in a part of the circumferential direction is disposed between the outer body and the inner body in the trunk portion.

  In the preform of the present invention according to the above-mentioned configuration, preferably, the adhesive sheet is integrally formed with either the outer body or the inner body.

  Further, in the preform according to the present invention, in the above configuration, at least a portion of the outer body and the inner body of the body extending in the vertical direction in the circumferential direction is fitted in the radial direction with respect to the other It is preferable that a pair of uneven portions be formed, and the adhesive sheet be disposed on the at least one pair of uneven portions.

The method for producing a synthetic resin container of the present invention is
A preform having an outer body and an inner body stacked on the inner surface of the outer body, and having a cylindrical opening, a body connected to the opening, and a bottom closing the lower end of the body. Forming the preform in which an adhesive sheet extending in the vertical direction in a part of the circumferential direction is disposed between the outer body and the inner body in the body portion;
Stretching blow molding the preform to form a synthetic resin container.

Further, in the method for producing a synthetic resin container of the present invention, in the above configuration,
The step of forming the preform comprises
Shaping the outer body and the inner body;
Placing the adhesive sheet on an inner peripheral surface of the outer body molded or an outer peripheral surface of the inner body molded;
Fitting the inner body molded on the inner peripheral surface of the outer body molded.

Further, in the method for producing a synthetic resin container of the present invention, in the above configuration,
The step of forming the preform comprises
Insert molding the outer body or the inner body using the adhesive sheet as an insert material;
Molding the inner body or the outer body paired with the insert-molded outer body or the inner body;
It is preferable to include the step of combining the insert-molded outer body or the inner body with the inner body or the outer body to be paired.

Further, in the method for producing a synthetic resin container of the present invention, in the above configuration,
The step of forming the preform comprises
Bicolor forming the adhesive sheet with the outer body or the inner body;
Molding the inner body or the outer body paired with the outer body or the inner body molded in two colors;
It is preferable to include the step of combining the outer body or the inner body which has been molded in two colors with the inner body or the outer body to be paired.

  According to the present invention, there is provided a synthetic resin container, a preform, and a method of manufacturing the synthetic resin container capable of suppressing the retention of the contents in the inner layer when the contents are used up until the contents can not be poured out. Can be provided.

It is a front fragmentary sectional view of a synthetic resin container which is one embodiment of the present invention. It is a plane partial cross section figure of the synthetic resin container shown in FIG. In the synthetic resin container shown in FIG. 1, it is a left side sectional view in the state where the contents are filled in the inner layer body. In the synthetic resin container shown in FIG. 1, it is a left side sectional view in the state where the contents are poured out and the volume of the inner layer is reduced. It is a front fragmentary sectional view of the preform which is one Embodiment of this invention. (A) Top view of the preform which is one Embodiment of this invention, (b) It is sectional drawing by the AA cross section in FIG. It is a front fragmentary sectional view of the outer body and adhesive sheet which comprise the preform which is one Embodiment of this invention. (A) top view of the outer body and adhesive sheet which comprise the preform which is one Embodiment of this invention, (b) It is sectional drawing by the BB cross section in FIG. It is a flowchart which shows the procedure of the manufacturing method of the synthetic resin container which is one Embodiment of this invention. It is a flowchart which shows the other procedure of the manufacturing method of the synthetic resin container which is one Embodiment of this invention. It is a flowchart which shows the further another procedure of the manufacturing method of the synthetic resin container which is one Embodiment of this invention.

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

  The synthetic resin container 1 according to the embodiment of the present invention shown in FIGS. 1 and 2 is also called a lamination peeling container or a delamination container, and has a double structure including an outer layer 2 and an inner layer 3. At the same time, its external shape is a bottle shape having a cylindrical opening 4, a cylindrical trunk 5 extending below the opening 4, and a bottom 6 closing the lower end of the trunk 5. There is.

  In the present specification, claims, and drawings, the vertical direction means the upper side and the lower side in a state in which the synthetic resin container 1 is in the upright posture as shown in FIG. 1. Further, the radially outer side is a direction toward the outside along a straight line perpendicular to the central axis O1 through the central axis O1 of the synthetic resin container 1 in FIG. 1, and the radially inner side is along the straight line The direction toward the central axis O1 shall be meant.

  The mouth 4 is provided with a male screw 4a, and a pouring member such as a pouring cap or a pouring pump can be screwed to the male screw 4a and attached to the mouth 4. The mouth 4 may be replaced by the male screw 4a and provided with an annular projection so that the spouting member such as a spout cap can be mounted by being engaged in an undercut state by tapping. . A neck ring 8 is provided at a lower portion of the mouth 4 for fixing to a blow molding die when forming the synthetic resin container 1 by, for example, stretch blow molding.

  Hereinafter, the case where this synthetic resin container 1 is used as a squeeze type pouring container is illustrated and demonstrated.

  The outer layer 2 constitutes the outer shell of the container 1 made of synthetic resin, and is formed of, for example, a synthetic resin material capable of stretch blow such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), etc. can do. The portion corresponding to the trunk portion 5 of the outer layer body 2 has flexibility, and can be squeezed (squeezed) to be recessed, and can be restored from the recessed state to the original shape. In addition, when using this synthetic resin container 1 as a container with a pump, the part corresponded to the trunk | drum 5 of the outer-layer body 2 does not need to be formed so that squeezing is possible.

  The inner layer 3 is formed in a bag shape thinner than the outer layer 2 by a synthetic resin material such as nylon, ethylene-vinyl alcohol copolymer resin (EVOH), polyethylene terephthalate (PET), etc. It is laminated to be peelable. Polyethylene terephthalate (PET) can be used for both the outer layer 2 and the inner layer 3. The inner layer 3 may have a single layer structure formed of only a single synthetic resin, but may be formed of a plurality of synthetic resins in order to improve barrier properties and content resistance (for example, PET / Ny / PET, PET + Ny blend, etc.) may be used. The inside of the inner layer 3 is a container 7 connected to the opening of the mouth 4. In the container 7, for example, food seasonings and beverages such as soy sauce, cosmetics such as lotions, shampoos and rinses , Toiletries such as liquid soap can be stored as contents.

  As shown in FIG. 1, an open air introduction hole 4 b for introducing the open air between the outer layer 2 and the inner layer 3 is provided in the mouth 4 of the outer layer 2. The outside air introducing hole 4 b can be provided at a position corresponding to the trunk 5 or a position corresponding to the bottom 6 in addition to the opening 4 of the outer layer 2. In any case, the outside air introduction hole 4b is configured to have a function as a check valve, or a check valve is attached to introduce outside air between the outer layer 2 and the inner layer 3 However, although it is preferable that the air between the outer layer 2 and the inner layer 3 is not allowed to flow out, it may be configured so that the function of the check valve or the check valve is not provided. In addition, the shape of the external air introduction hole 4b is not limited to the illustrated long hole shape, and various other shapes such as a circular shape can be adopted.

  The synthetic resin container 1 having such a configuration can be configured as a pouring container by attaching a pouring member such as a pouring cap to the opening 4 thereof. In this case, the contents can be poured out from the pouring member by squeezing a portion corresponding to the trunk portion 5 of the outer layer body 2, and the inner layer body 3 is the outer layer along with the pouring of the contents. It can be peeled off from the inner surface of the body 2 and reduced in volume. After the release of the squeeze, outside air is introduced between the outer layer 2 and the inner layer 3 from the outer air introducing hole 4b provided in the outer layer 2, and the outer layer 2 is reduced while the inner layer 3 is reduced in volume. It can be restored to the shape. Therefore, it is possible to pour out the contents contained in the containing section 7 without replacing the contents with the outside air, thereby reducing the contact of the outside air with the contents contained in the containing section 7 and deteriorating or degrading the contents. Can be suppressed.

  In the synthetic resin container 1 of the present invention, the space between the outer layer 2 and the inner layer 3 in the body 5 is prevented in order to prevent the inner layer 3 from being irregularly reduced in volume as the contents are poured out. An adhesive band 10 extending in the vertical direction is provided. In the present embodiment, as shown in FIGS. 1 and 2, the adhesive bands 10 are disposed at two opposing positions in the circumferential direction of the trunk portion 5. As described above, the adhesive band 10 extending in the vertical direction is arranged at two places in the circumferential direction, and the contents in the inner layer 3 are used by partially bonding the outer layer 2 and the inner layer 3 to use the inner layer 3 At the time of volume reduction deformation, the inner layer body 3 can be regularly reduced volume deformation in the direction perpendicular to the paper surface of FIG. This will be described with reference to FIGS. 3 and 4 in which the synthetic resin container 1 shown in FIG. 1 is viewed from the left. In addition, FIG.3 and FIG.4 has shown the state which mounted | worn the opening part 4 with the pouring cap which pours out the contents outside. When the user pours out the contents from the state shown in FIG. 3 in which the contents are filled in the inner container 7 of the inner layer 3, the inner layer 3 is, as shown in FIG. While being maintained in the above shape, it is squeezed in the left-right direction (the direction perpendicular to the sheet of FIG. 1) of FIG. Thus, in the synthetic resin container 1 of the present embodiment, the thickness of the outer shape of the inner layer 3 seen from the direction of FIGS. 3 and 4 while generally maintaining the shape of the inner layer 3 seen from the direction of FIG. To prevent the inner layer body 3 from being irregularly deformed to narrow the pouring path of the contents or to deteriorate the pouring operability, because the volume is reduced regularly so that it can. That is, it is possible to suppress the remaining of the contents in the inner layer 3 when the contents are used up until the contents can not be poured out.

  In addition, as shown in FIG. 1, the adhesive zone 10 is arrange | positioned in the position which does not overlap with the external air introduction hole 4b in the circumferential direction. That is, while the outside air introduction holes 4b are disposed on the front and back of FIG. 1, the adhesive bands 10 are disposed at one place on the left and right of FIG. By this configuration, the outside air introduction hole 4 b can be prevented from being blocked by the adhesive band 10.

  As a material of the adhesive zone 10, for example, a hot-melt material which is a polyester-based adhesive resin can be used, and as an example, “Byron” (registered trademark) manufactured by Toyobo Co., Ltd. and the like can be mentioned. In this case, it is particularly preferable to use “GA-6400” having a melting point of 96 ° C. from the viewpoint of ease of melting of the adhesive sheet 20 (corresponding to the adhesive band 10 after stretch blow molding) during stretch blow molding described later. Preferably, in the case of a PET / PET laminate peeling container, the adhesive resin is melted by using an adhesive resin having a melting point of 90 to 110 ° C. because the heating temperature of the preform 11 is about 100 ° C. at the stretch blow. It is preferable that the PET of the outer body 12 and the PET of the inner body 13 are stretched while adhering. However, the material is not limited to this, and the material of the adhesive band 10 may be selected according to the resin base material used for the preform 11, and another adhesive resin such as a polyolefin-based adhesive resin may be used.

  In this embodiment, as shown in Drawing 1 and Drawing 2, although it constituted so that adhesive belt 10 might be provided in two places which counter in a peripheral direction of trunk part 5, it is not limited to this mode. The adhesive band may be configured to extend in the vertical direction at at least one location in the circumferential direction of the trunk portion 5. Further, the adhesive band 10 may extend to the mouth 4 or the bottom 6 or may be provided on only a part of the trunk 5.

  The synthetic resin container 1 can be formed by stretch blow molding a synthetic resin preform 11 according to an embodiment of the present invention shown in FIGS. 5 and 6 (a) and 6 (b).

  The preform 11 has a double structure including an outer body 12 made of synthetic resin that forms the outer layer body 2 and an inner body 13 made of synthetic resin that forms the inner layer body 3. , A cylindrical bottom portion (substantially test tubular) having a cylindrical opening portion 14, a cylindrical trunk portion 15 continuing below the opening portion 14, and a bottom portion 16 closing the lower end of the trunk portion 15 ing. The mouth 14 is formed in a shape corresponding to the mouth 4 of the synthetic resin container 1, and the bottom 16 is formed in a curved shape (hemispherical shape). The opening portion of the upper end portion of the inner body 13 is provided with an annular flange projecting radially outward, and the flange is bridged (placed) on the opening end of the outer body 12 to provide an inner body. Thirteen open portions are fixed to the open end. In addition, the code | symbol O2 has shown the central axis common to the opening part 14, the trunk | drum 15, and the bottom part 16. As shown in FIG.

  The outer body 12 is formed of the same synthetic resin material as that of the outer layer body 2, that is, a synthetic resin material such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), or the like. The inner body 13 is also formed of a synthetic resin material similar to that of the inner layer body 3, a synthetic resin material of polyethylene terephthalate (PET), nylon or ethylene-vinyl alcohol copolymer resin (EVOH). The inner body 13 is formed to be thinner than the outer body 12 and is laminated on the inner surface of the outer body 12 so as to cover the entire inner surface.

  In the preform 11 of the present embodiment, as shown in FIG. 6 (b), an adhesive sheet 20 extending in the vertical direction is disposed in the region between the outer body 12 and the inner body 13 in the trunk portion 15. In the present embodiment, the adhesive sheet 20 is formed on the outer peripheral surface of the inner body 13 and is formed on the inner peripheral surface of the outer body 12 so as to protrude in the vertical direction while projecting outward in the radial direction. It is arrange | positioned at a pair of uneven part 18 fitted by the recessed part 18b extended to an up-down direction. The adhesive sheet 20 is arrange | positioned at the contact surface of the convex part 18a extended in the circumferential direction and an up-down direction, and the recessed part 18b, as shown in FIG.6 (b).

  In order to form such a preform 11, first, as shown in FIG. 7, a test tubular outer body 12 having a mouth 14, a body 15 and a bottom 16 is formed by injection molding, and the inside of the outer body 12 is formed. The adhesive sheet 20 is disposed in the recess 18 b formed at two positions in the circumferential direction on the circumferential surface. As shown in FIGS. 8A and 8B, the adhesive sheet 20 is a thin sheet having a width corresponding to the circumferential width of the recess 18b and extending from the bottom portion 16 to the vicinity of the upper end portion of the recess 18b. The adhesive sheet 20 can be formed, for example, by processing into a sheet by heating and pressing pellet-like "Vyron" and further cutting into a strip to a width corresponding to the circumferential width of the recess 18b. .

  In the present embodiment, although the recess 18 b and the adhesive sheet 20 are configured to extend in the vertical direction from the top of the trunk portion 15 to the bottom portion 16, the present invention is not limited to this aspect. The recess 18 b and the adhesive sheet 20 may be configured to extend only to the region not including the bottom portion 16 or may be configured to extend to the mouth portion 14.

  Next, the outer peripheral surface of the inner body 13 formed by injection molding separately from the outer body 12 is fitted to the inner peripheral surface of the outer body 12. At this time, as shown in FIG. 6 (b), the convex portion 18 a protruding radially outward from the outer peripheral surface of the inner body 13 is fitted in the concave portion 18 b formed in the inner peripheral surface of the outer body 12. Perform after setting the circumferential position. Thus, the circumferential position of the inner body 13 with respect to the outer body 12 is determined, and the adhesive sheet 20 is nipped and positioned between the convex portion 18a and the concave portion 18b as shown in FIG. 6 (b).

  As described above, in the preform 11 of this embodiment, the outer body 12 and the inner body 13 are separately formed by injection molding in the example illustrated in FIGS. 5 and 6A and 6B, Although the adhesive sheet 20 was arrange | positioned between the outer body 12 and the inner body 13 (concave part 18b) and it comprised so that the inner body 13 could be fitted with the internal peripheral surface of the outer body 12, it is not limited to this aspect. The preform 11 is obtained, for example, by insert molding the outer body 12 (or inner body 13) using the adhesive sheet 20 produced by the above-described method as an insert material, and separately molding the inner body 13 (or outer body 12) It may be configured to form a preform 11 in combination. Further, the preform 11 forms the preform 11 by combining the adhesive sheet 20 with the outer body 12 (or the inner body 13) and combining with the inner body 13 (or the outer body 12) separately formed by injection molding. It may be configured as follows. When the adhesive sheet 20 is formed by two-color molding with the outer body 12 (or the inner body 13), for example, after forming the outer body 12 (or the inner body 13) by a mold, a core or a cavity corresponding to the adhesive sheet 20 Then, the resin of the adhesive sheet 20 can be molded into the mold by injection.

  Next, a method of manufacturing the synthetic resin container 1 according to an embodiment of the present invention will be described.

  FIG. 9 is a flow chart showing the procedure for carrying out the method of manufacturing the synthetic resin container 1 according to the present embodiment. Here, after the outer body 12, the inner body 13 and the adhesive sheet 20 are separately prepared, these are assembled into a preform 11.

  First, a method of forming a preform 11 for producing the synthetic resin container 1 by stretch blow molding will be described. First, the outer body 12 shown in FIGS. 7 and 8A and 8B is formed by injection molding (step S101). Further, in parallel with the molding of the outer body 12, the inner body 13 shown in FIGS. 5, 6A and 6B is molded by another injection molding process (step S102). Although FIG. 9 describes that the inner body 13 is formed subsequent to the formation of the outer body 12, the forming order is not limited because the formation of the two can be performed independently.

  Further, in parallel with steps S101 and S102, an adhesive sheet 20 for bonding the outer body 12 and the inner body 13 is created (step S103). The adhesive sheet 20 may be prepared, for example, by heating, pressing and cutting a pellet-like polyester-based adhesive resin as described above to form a strip-like sheet, or by other methods such as injection molding. May be Alternatively, the sheet-like adhesive sheet 20 may be formed by applying and curing the molten adhesive resin to the outer body 12 or the inner body 13.

  Next, the adhesive sheet 20 created in step S103 is placed on the outer body 12 or the inner body 13 formed in steps S101 and S102 (step S104). More specifically, for example, a strip-like adhesive sheet 20 is disposed in a recess 18 b provided on the inner peripheral surface of the outer body 12 as shown in FIG. 8 (b). Instead of this, the adhesive sheet 20 may be disposed outside the convex portion 18 a provided on the outer peripheral surface of the inner body 13 shown in FIG. 6 (b). Moreover, the adhesive sheet 20 may be positioned with respect to the outer body 12 or the inner body 13 by means other than the uneven part 18. Moreover, as long as the space which arrange | positions the adhesive sheet 20 between the outer body 12 and the inner body 13 is provided, the positioning means of the adhesive sheet 20 does not need to be provided.

  Next, the outer peripheral surface of the inner body 13 is fitted to the inner peripheral surface of the outer body 12 to form a preform 11 (step S105). When forming the preform 11, as shown in FIG. 6 (b), the convex portion 18a formed on the outer peripheral surface of the inner body 13 is fitted into the concave portion 18b formed on the inner peripheral surface of the outer body 12 In this way, it is performed after aligning the circumferential direction position of both. Further, as shown in FIG. 5, the annular flange projecting radially outward from the upper end of the opening 14 of the inner body 13 abuts against the opening end of the outer body 12 from above, whereby the inner body 13 is an outer body Positioned relative to 12

  Next, the preform 11 formed in step S105 is stretch blow molded to form the synthetic resin container 1 which is a lamination peeling container. At the time of the stretch blow molding, first, the preform 11 is heated in a heating furnace (step S106). The adhesive sheet 20 arrange | positioned between the outer body 12 and the inner body 13 will be in a molten state by this. In this state, the neck ring 19 of the preform 11 is abutted against and fixed to the reference surface of the blow molding die, and the preform 11 is stretch blow molded (step S107). As a result, the adhesive sheet 20 in a molten state is blown downward with the outer body 12 and the inner body 13 by the drawing rod while being blown radially outward by high pressure air, so that the outer layer body 2 is crystallized by cooling etc. And the inner layer body 3 can be adhered relatively uniformly.

  FIG. 10 is a flow chart showing another procedure for carrying out the method of manufacturing the synthetic resin container 1 according to the present embodiment. Here, after the outer sheet 12 is formed by insert molding using the adhesive sheet 20 as an insert material, a procedure is used in which the inner body 13 formed by injection molding is combined to form the preform 11.

  First, a method of forming a preform 11 for manufacturing the synthetic resin container 1 by stretch blow molding will be described. First, an adhesive sheet 20 for bonding the outer body 12 and the inner body 13 is created (step S201). The preparation of the adhesive sheet 20 is the same as step S103 in FIG. Next, the outer body 12 is formed by insert molding using the adhesive sheet 20 created in step S201 as an insert material (step S202). The molding of the outer body 12 by insert molding is performed by setting the adhesive sheet 20 prepared in step S201 in a mold for insert molding, injecting the resin for the outer body 12 into the mold for insert molding, and curing it. The outer body 12 is molded. Further, separately from the outer body 12, the inner body 13 is formed by injection molding (step S203).

  Next, the outer peripheral surface of the inner body 13 is fitted to the inner peripheral surface of the outer body 12 to form a preform 11 (step S204). When forming the preform 11, as shown in FIG. 6 (b), the convex portion 18a formed on the outer peripheral surface of the inner body 13 is fitted into the concave portion 18b formed on the inner peripheral surface of the outer body 12 In this way, it is performed after aligning the circumferential direction position of both. Further, as shown in FIG. 5, the annular flange projecting radially outward from the upper end of the opening 14 of the inner body 13 abuts against the opening end of the outer body 12 from above, whereby the inner body 13 is an outer body Positioned relative to 12

  Next, the preform 11 formed in step S204 is stretch blow-molded to form the synthetic resin container 1 which is a lamination peeling container (steps S205 and S206). The stretch blow molding is the same as steps S106 and S107 in FIG. 9, and thus the description thereof is omitted here.

  Although the outer body 12 is insert-molded to the adhesive sheet 20 and the inner body 13 is formed by injection molding, the present invention is not limited to this embodiment. The body 13 may be insert molded and the outer body 12 may be formed by injection molding.

  FIG. 11 is a flow chart showing still another procedure for carrying out the method of manufacturing the synthetic resin container 1 according to the present embodiment. Here, after the adhesive sheet 20 is formed by two-color molding together with the outer body 12, a procedure is used in which the inner body 13 formed by injection molding is combined to form the preform 11.

  First, a method of forming a preform 11 for manufacturing the synthetic resin container 1 by stretch blow molding will be described. First, the adhesive sheet 20 is formed in two colors with the outer body 12 (step S301). In this two-color molding, for example, after molding the outer body 12 (or the inner body 13) with a mold, the core or cavity is replaced with one corresponding to the adhesive sheet 20, and then the resin of the adhesive sheet 20 is the same mold. It can be done by injecting into the inside. Further, separately from the outer body 12, the inner body 13 is formed by injection molding (step S302).

  Next, the outer peripheral surface of the inner body 13 is fitted to the inner peripheral surface of the outer body 12 to form a preform 11 (step S303). When forming the preform 11, as shown in FIG. 6 (b), the convex portion 18a formed on the outer peripheral surface of the inner body 13 is fitted into the concave portion 18b formed on the inner peripheral surface of the outer body 12 In this way, it is performed after aligning the circumferential direction position of both. Further, as shown in FIG. 5, the annular flange projecting radially outward from the upper end of the opening 14 of the inner body 13 abuts against the opening end of the outer body 12 from above, whereby the inner body 13 is an outer body Positioned relative to 12

  Next, the preform 11 formed in step S303 is stretch blow-molded to form the synthetic resin container 1 which is a lamination peeling container (steps S304 and S305). The stretch blow molding is the same as steps S106 and S107 in FIG. 9, and thus the description thereof is omitted here.

  In addition, although the adhesive sheet 20 was formed by two-color molding with the outer body 12 and the example which forms the inner body 13 by injection molding was mentioned and demonstrated, it is not limited to this aspect, the adhesive sheet 20 with the inner body 13 It may be molded in two colors, and the outer body 12 may be formed by injection molding. Also, the adhesive sheet 20 is first molded, and the core or cavity is replaced with one corresponding to the outer body 12 (or inner body 13), and then the resin of the outer body 12 (or inner body 13) is put in the same mold. Two-color molding may be performed by injection.

  Moreover, although the example which shape | molds the outer body 12 and the inner body 13 by injection molding was mentioned and demonstrated in this embodiment, it is not limited to this, You may employ | adopt other molding methods, such as compression molding.

  In the present embodiment, the mouth 4 and the body 5 are formed in a substantially cylindrical shape, but the present invention is not limited to this. For example, the mouth 4 and the body 5 may have a rectangular cylindrical shape or an elliptical cylindrical shape. Similarly, in the preform 11 of the present embodiment, the mouth portion 14 and the body portion 15 are formed in a substantially cylindrical shape, but not limited to this, for example, a square cylindrical shape or an elliptical cylindrical shape can also be used. .

  As described above, in the synthetic resin container 1 according to the present embodiment, the outer layer body 2 and the inner layer body 3 are partially adhered in the circumferential direction by the adhesive band 10 extending in the vertical direction in the trunk portion 5 The body 5 is formed by stretch blow molding the outer layer 2 and the inner layer 3 together with the adhesive band 10. Thereby, when the user pours out the contents in the inner layer body 3, the deformation of the inner layer body 3 is restricted by these adhesive bands 10, and the shape of the inner layer body 3 spreads in the vertical direction starting from the adhesive band 10. Since the inner layer body 3 is regularly subjected to volume reduction deformation so that the thickness of the outer shape of the inner layer body 3 is reduced while maintaining the slipped state, the inner layer body 3 is irregularly reduced in volume and deformed. Can be restrained from being reduced or the pouring operability is impaired. Therefore, it is possible to suppress the remaining of the contents in the inner layer 3 when the contents are used up until the contents can not be poured out. In particular, in the present embodiment, since the adhesive band 10 is configured to be stretch blow molded with the outer layer 2 and the inner layer 3, the adhesive sheet 20 is stretched and blow molded with the outer body 12 and the inner body 13. 2 and the inner layer 3 can be adhered relatively uniformly.

  Moreover, in this embodiment, it comprised so that the adhesive zone 10 might be comprised with the hot-melt material which has polyester-type resin. As a result, the adhesive sheet 20 which is in a molten state by heating the preform 11 is drawn together with the outer body 12 and the inner body 13 and blow molded, so that the outer layer 2 and the inner layer 3 are more uniformly bonded at the time of cooling. be able to.

  Further, in the present embodiment, the outer layer body 2 has the outside air introducing hole 4 b for introducing the outside air into the space between the outer layer body 2 and the inner layer body 3, and the outside air introducing hole 4 b is in the circumferential direction with the adhesive band 10. It was configured to be placed at a position not overlapping. By this, it is possible to prevent the outside air introduction hole 4 b from being blocked by the adhesive band 10.

  Moreover, in this embodiment, it comprised so that the adhesive strip 10 might be provided in two places which the circumferential direction opposes. As a result, while maintaining the shape of the inner layer body 3 viewed from the direction of FIG. 1, the volume reduction deformation of the inner layer body 3 is regularly performed so that the thickness of the inner layer body 3 viewed from the direction of FIGS. It can be done. Therefore, it can be effectively suppressed that the volume of the inner layer body 3 is irregularly reduced and the pouring path of the contents is narrowed or the pouring operability is impaired. Therefore, it is possible to effectively suppress the remaining of the contents in the inner layer 3 when the contents are used up until the contents can not be poured out.

  Further, in the present embodiment, the adhesive sheet 20 is configured to be integrally formed with either the outer body 12 or the inner body 13. By this, the manufacturing process of preform 11 can be reduced and quality variation can be suppressed.

  Further, in the present embodiment, at least a pair of the outer body 12 and the inner body 13 of the body portion 15 of the preform 11 extend in the vertical direction in a part of the circumferential direction and at least one pair is fitted in the radial direction with respect to the other. The uneven portion 18 was formed, and the adhesive sheet 20 was configured to be disposed on the uneven portion 18. In addition to facilitating positional alignment in the circumferential direction of the outer body 12 and the inner body 13 which are separately formed, the adhesive sheet 20 can be easily positioned and arranged on the uneven portion 18.

  Further, in the present embodiment, the outer sheet 12 or the inner body 13 is insert-molded by using the adhesive sheet 20 as an insert material, and the separately molded injection-molded inner body 13 or the outer body 12 is combined to form the premold 11. did. By this, the manufacturing process can be reduced and the quality variation can be suppressed.

  Further, in this embodiment, the adhesive sheet 20 is formed by two-color molding with the outer body 12 or the inner body 13, and the separately molded injection-molded inner body 13 or the outer body 12 is combined to form the premold 11. As a result, it is possible to further reduce the number of manufacturing steps and to suppress quality variation.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, functions included in each component can be rearranged so as not to be logically contradictory, and a plurality of components can be combined or divided into one. It should be understood that these are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Synthetic resin container 2 outer layer body 3 inner layer body 4 mouth 4a external thread 4b external air introduction hole 5 body 6 bottom 7 accommodation 8 neck ring 10 adhesive band 11 preform 12 outer body 13 inner body 13 inner body 14 mouth 15 body 16 Bottom 18 Irregularities 18a Convexities 18b Concaves 19 Neck Ring 20 Adhesive Sheet O1, O2 Central Axis

Claims (12)

A synthetic resin container comprising an outer layer body and an inner layer body laminated in a peelable manner on the inner surface of the outer layer body,
With a cylindrical mouth,
A body connected to the mouth;
And a bottom portion closing the lower end of the body portion,
The outer layer body and the inner layer body are partially adhered in the circumferential direction by an adhesive band extending in the vertical direction in the body portion,
The said trunk | drum is formed by extending | stretch-blow-molding the said outer-layer body and the said inner-layer body with the said adhesive zone, The synthetic resin container characterized by the above-mentioned.   The synthetic resin container according to claim 1, wherein the outer layer body and the inner layer body are mainly made of polyethylene terephthalate.   The synthetic resin container according to claim 1, wherein the adhesive band is made of a hot melt material having a polyester resin.   The outer layer body has an outside air introducing hole for introducing outside air into a space between the outer layer body and the inner layer body, and the outside air introducing hole is disposed at a position not overlapping the adhesive zone in the circumferential direction The synthetic resin container according to any one of claims 1 to 3.   The synthetic resin container according to any one of claims 1 to 4, wherein the adhesive band is provided at two opposing locations in the circumferential direction. A synthetic resin preform having an outer body and an inner body laminated on the inner surface of the outer body and used for stretch blow molding,
With a cylindrical mouth,
A body connected to the mouth;
And a bottom portion closing the lower end of the body portion,
A preform characterized in that an adhesive sheet extending in the vertical direction in a part of the circumferential direction is disposed between the outer body and the inner body in the body portion.   The preform according to claim 6, wherein the adhesive sheet is integrally formed with either the outer body or the inner body.   The outer body and the inner body of the body portion are formed with at least a pair of concavo-convex portions extending in the vertical direction in a part of the circumferential direction and in which one is fitted in the radial direction to the other. The preform according to claim 6 or 7, which is disposed in the at least one pair of concavo-convex portions. A method of manufacturing a synthetic resin container, wherein
A preform having an outer body and an inner body stacked on the inner surface of the outer body, and having a cylindrical opening, a body connected to the opening, and a bottom closing the lower end of the body. Forming the preform in which an adhesive sheet extending in the vertical direction in a part of the circumferential direction is disposed between the outer body and the inner body in the body portion;
And b. Stretch blow molding the preform to form a synthetic resin container. The step of forming the preform comprises
Shaping the outer body and the inner body;
Placing the adhesive sheet on an inner peripheral surface of the outer body molded or an outer peripheral surface of the inner body molded;
Fitting the molded inner body on the inner peripheral surface of the molded outer body. The method of manufacturing a synthetic resin container according to claim 9. The step of forming the preform comprises
Insert molding the outer body or the inner body using the adhesive sheet as an insert material;
Molding the inner body or the outer body paired with the insert-molded outer body or the inner body;
The method for manufacturing a synthetic resin container according to claim 9, comprising the step of combining the insert-molded outer body or the inner body with the inner body or the outer body to be paired. The step of forming the preform comprises
Bicolor forming the adhesive sheet with the outer body or the inner body;
Molding the inner body or the outer body paired with the outer body or the inner body molded in two colors;
The method for producing a synthetic resin container according to claim 9, comprising the step of combining the outer body or the inner body which is molded in two colors with the inner body or the outer body which is paired.

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