JP2017113933A - Production method of double bottle container and double bottle container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method of a double bottle container having high quality and excellent in good appearance.SOLUTION: There is provided a method for producing a double bottle container 1 in which an inner bottle 20 is arranged in an outer bottle, using the outer bottle 10 formed of an injection molding having an opening 13 on an upper end 11, and a parison 30 formed of an injection molding having a flange 31 on a midway from an opening 21 on an upper end to a bottom part, comprising: a step s1 for heating the parison 30; a step s2 for positioning the heated parison in the outer bottle and arranging the same; and a step s3 for fixing the outer bottle in which the parison is arranged to inside of a mold 203 having an inner surface shape along an outer diameter of the double bottle container, and molding the parison by an injection blow method, for forming the inner bottle whose outer surface is along an inner surface shape of the outer bottle, in the step for arranging the parison, a peripheral edge lower surface of the flange is brought into contact with the upper end surface of the outer bottle.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for manufacturing a double bottle container in which an inner bottle is disposed inside an outer bottle that is a resin hollow body, and a double bottle container.

  There is a double bottle container as a container for storing cosmetics and the like as contents. The double bottle container has a structure in which an inner bottle serving as a container for substantial contents is disposed inside an outer bottle that is a resin hollow body that has a function of improving the appearance of the appearance. . As the double bottle container, for example, a so-called “overmolded container” is well known.

  The overmolded container is a structure in which a hollow resin molded body (hereinafter referred to as an inner bottle) filled with contents is integrated in a state of being covered with an injection molded body (hereinafter referred to as an outer) of a molten resin. As a method for manufacturing an overmolded container, for example, as described in Non-Patent Document 1 below, after an inner bottle is manufactured by blow molding or the like, the inner bottle is placed in a mold, and the inner bottle As the inner mold, molten resin is injected into the mold to mold the outer, and the inner bottle and the outer are integrated.

  In such a double bottle container such as an overmolded container, for example, an inner bottle of a colored resin is covered with an outer made of a transparent or transparent resin such as polished glass or colored glass. While shielding the contents to prevent quality deterioration due to external light, it is possible to provide a tactile sensation similar to glass and a texture of appearance, such as a profound feeling and luxury. The method for manufacturing the overmolded container is described in, for example, Patent Document 1 below. Moreover, as another double container, there exists what shape | molded both the outer bottle and the inner bottle which were described in the following patent documents 2 with the blow molded product. Of course, there is a simple structure in which a member serving as an inner is fitted into a hollow cylindrical outer bottle with a bottom. The following non-patent documents relating to the present invention outline various resin molding methods including a blow molding method.

Japanese Patent Laid-Open No. 06-23758 JP-A-2005-47172

Yoshino Kogyo Co., Ltd., “Description of each forming method”, [online], [searched on November 18, 2015], Internet <URL: http://www.yoshinokogyosho.co.jp/seikei.html>

  When manufacturing a double bottle container in the same way as an overmolded container, the outer bottle is molded by injecting molten resin outside the inner bottle. May be deformed, and it is difficult to maintain uniform and high quality. In the technique described in Patent Document 2, since the outer bottle is also a blow molded product, the thickness of the outer bottle becomes uniform in principle. In other words, it cannot be locally thickened. If the wall thickness is uniform, the shape of the outer bottle must be simple, and it is difficult to manufacture an outer bottle that is excellent in terms of modeling. For example, it is not possible to provide an excellent aesthetic appearance by forming the outer bottle with a transparent resin and making the bottom and side portions thick.

  When fitting the inner bottle into the outer bottle, it is necessary that the manufactured inner bottle be inserted into the manufactured outer bottle. For example, the inner surface shape of the outer bottle and the outer surface shape of the inner bottle are cylindrical. The shape is limited to a simple shape such as a truncated cone that decreases in diameter toward the bottom. Therefore, in this case as well, it is difficult to manufacture a double bottle container excellent in modeling. Further, since it is simply fitted, a gap is formed between the outer surface of the inner bottle and the inner surface of the outer bottle, and foreign matter is easily mixed. If it is a liquid, there is a possibility that the liquid may invade into the gap due to the capillary phenomenon, and the aesthetics will be greatly impaired. Of course, if foreign matter or liquid enters between the outer bottle and the inner bottle, there is a problem in terms of quality and practical use. In addition, the inner bottle may fall off the outer bottle due to impact or the like.

  Accordingly, the present invention is to provide a method for producing a double bottle container having high quality and excellent aesthetics.

The present invention for achieving the above object is a method of manufacturing a double bottle container in which an inner bottle in which contents are stored is arranged inside an outer bottle made of a resin injection molded product having an opening at the upper end. There,
Using the bottomed cylindrical parison that is injection molded as a precursor of the inner bottle having the opening at the upper end and the outer bottle molded into a predetermined shape,
A heating step for heating the parison;
A parison placement step for placing the parison heated inward of the outer bottle in a positioned state;
By molding the parison by the injection blow method while fixing the outer bottle in a state where the parison is arranged in the inner side in a mold having an inner surface shape along the outer diameter of the double bottle container, A blow molding step for forming the inner bottle, the outer surface of which is formed in a shape along the inner shape of the outer bottle;
Including
The parison includes a flange projecting radially in the vertical direction on the way from the opening at the top to the bottom at the bottom,
In the parison arrangement step, the peripheral lower surface of the flange is brought into contact with the upper end surface of the outer bottle,
This is a method for manufacturing a double bottle container.

  The outer bottle has a peripheral edge of the opening cut away to form a step on the upper end surface, and in the parison placement step, the peripheral edge of the flange is engaged with the step. It can be a method.

  Alternatively, the lower surface of the flange is formed with a protrusion protruding downward, and the outer peripheral surface of the protrusion and the inner peripheral surface on the opening end side of the outer bottle are formed in shapes that engage with each other, In the parison arrangement step, the outer peripheral surface of the protrusion may be brought into contact with the inner peripheral surface on the opening end side of the outer bottle. The protrusions are intermittently formed at a plurality of locations, and the shape of the inner peripheral surface on the opening end side of the outer bottle is an area corresponding to the outer peripheral surface of the protrusions. It is more preferable if the manufacturing method of the double bottle container is characterized by being formed into a shape along the outer peripheral surface.

A protrusion protruding downward is formed around the lower surface of the flange, and a groove into which the protrusion is inserted is formed around the upper end surface of the outer bottle,
In the parison arrangement step, the double bottle container manufacturing method may be characterized in that the protrusion is inserted into the groove. More preferably, the protrusion is intermittently formed at a plurality of locations, and the groove of the outer bottle is formed intermittently in a region corresponding to the formation location of the protrusion. The manufacturing method is as follows.

  In the outer bottle, a closed space formed by the inner surface of the outer bottle, the outer surface of the parison, and the lower surface of the flange of the parison in a state where the parison is disposed in the outer bottle by the parison arrangement step. And a venting path that connects the outside of the outer bottle and the outside of the outer bottle may be formed.

  A groove extending radially outward is formed on at least one of the lower surface of the flange or the upper end surface of the outer bottle, and the parison is placed in the outer bottle by the parison placement step. In an arranged state, the outer space is formed so as to communicate the closed space formed by the inner surface of the outer bottle, the outer surface of the parison, and the lower surface of the flange of the parison with the outer side of the outer bottle. It can also be set as the manufacturing method of the double bottle container characterized by this.

  Alternatively, the parison includes a vent that communicates the lower surface and the upper surface of the flange, and in the state where the parison is disposed in the outer bottle by the parison placement step, the inner surface of the outer bottle, the outer surface of the parison And a closed space formed by the lower surface of the flange of the parison and the outer side of the outer bottle communicate with each other through the vent hole. it can. A concave portion is formed on the inner peripheral surface of the outer bottle, and in the blow molding step, the outer peripheral surface of the inner bottle is engaged with the concave portion. More preferred.

  Including a step of arranging a decorative film on the inner peripheral surface of the outer bottle, wherein the decorative film is sandwiched between the outer peripheral surface of the inner bottle and the inner peripheral surface of the outer bottle in the blow molding step. It can also be set as the manufacturing method of the double bottle container.

Further, the double bottle container manufactured by any one of the above methods is also within the scope of the present invention, and the double bottle container includes an inner bottle made of a blow molded product arranged in an outer bottle made of an injection molded product. The inner bottle has an opening at the upper end and a storage portion for the contents at the lower end through the neck, the neck protruding to the upper end of the outer bottle,
The storage portion has a shoulder portion continuous from the lower end of the neck portion to the outer peripheral surface exposed from the upper end surface of the outer bottle, and a region extending from the outer peripheral surface to the bottom surface is in close contact with the inner surface of the outer bottle.
This is a double bottle container.

  According to the method for producing a double bottle container of the present invention, a high quality and beautiful double bottle container can be produced, and the double bottle container produced by the method is high quality and excellent in beauty. It will be a thing. Other effects will be clarified in the following description.

It is a figure which shows an example of the double bottle container manufactured by the manufacturing method which concerns on the Example of this invention. It is a figure which shows the outline of the manufacturing method of the double bottle container which concerns on the Example of this invention. It is a figure which shows an example of the manufacturing line for manufacturing a double bottle container based on the said manufacturing method. It is a figure which shows the example of the manufacturing method which can improve the alignment precision of an inner bottle in the manufacturing method of the double bottle container which concerns on the Example of this invention. It is a figure which shows the example of the parison used in order to make blow molding easy in the manufacturing method of the double bottle container which concerns on the Example of this invention. It is a figure which shows the outline of the manufacturing method for making the said blow molding easy. It is a figure which shows the example for fixing an inner bottle more firmly in an outer bottle in the manufacturing method of the double bottle container which concerns on the Example of this invention.

=== Structure of double bottle container ===
FIG. 1 is a diagram showing an example of a double bottle container 1 targeted by the present invention. FIG. 1A is a perspective view showing the appearance of the double bottle container (hereinafter referred to as container 1), and FIG. 1B is a view corresponding to the cross section taken along the line aa in FIG. . FIG. 1C is an enlarged view of the inside of the circle 3 in FIG. In addition, FIG.1 (D) is the figure which expanded a part of modification of the double bottle shown to FIG.1 (A)-(C). As shown in FIG. 1A, the container 1 is arranged in a bottomed cylindrical outer bottle 10 made of a transparent hard resin so that the cylindrical inner bottle 20 is coaxial with the outer bottle 10. It has a structure. Here, when the direction of the cylinder axis 2 of the bottomed cylindrical outer bottle 10 is the vertical direction (or the vertical direction), and the upper and lower directions are defined with the opening 21 of the inner bottle as the upper side and the bottom 22 as the lower side, the inner bottle Reference numeral 20 denotes a cylindrical neck portion 24 having a reduced diameter on the upper end side of a cylindrical body portion (hereinafter referred to as a storage portion 23) serving as a storage space for contents, and the neck portion 24 is the upper end surface 11 of the outer bottle 10. Projecting from the side, an opening 21 is formed at the tip of the neck 24. A male screw 25 is formed around the neck portion 24, and a cylindrical cap (not shown) in which a female screw is formed is attached to the neck portion 24.

  As shown in FIG. 1B, a shoulder 26 that is a boundary between the storage portion 23 and the neck 24 of the inner bottle 20 is exposed from the upper end surface 11 of the outer bottle. In this example, the shoulder 26 and the outer It shape | molds so that the upper end surface 11 of the bottle 10 may become flush | level. As shown in FIG. 1C, the peripheral edge 27 of the shoulder portion 26 of the inner bottle 20 is formed in a bowl shape so as to protrude slightly outward. On the upper end side of the inner surface 14 of the outer bottle 10, a step 12 is formed that supports the peripheral edge 27 of the shoulder portion 26 of the inner bottle 20 and engages with the bowl-like shape of the peripheral edge 27. Of course, when there is variation in the molding accuracy of the outer bottle 10 or the inner bottle 20, or when an R is provided at the peripheral corner of the shoulder 26, the step 12 is accurately formed in the bowl-like shape of the shoulder 26. There is a possibility that they do not engage with each other and do not become flush with each other, or there is a gap between the step 12 and the edge of the shoulder portion 26. If such a possibility is a concern, the step 12 may not be provided, and the peripheral edge 27 of the shoulder 26 may only be supported by the upper end surface 11 of the outer bottle 10 as shown in FIG. .

=== Method for producing double bottle container ===
Next, a method for manufacturing the double bottle container 1 shown in FIG. 1 will be described. FIG. 2 is a longitudinal sectional view showing an outline of a method for producing a double bottle container, and FIGS. 2A to 2C show a flow in the production method. First, as shown in FIG. 2A, an outer bottle 10 constituting a double bottle container and a parison 30 that finally becomes an inner bottle are formed by injection molding and prepared. The outer bottle 10 has a bottomed cylindrical shape having an opening 13 on the upper side, and the parison 30 is generally a test tube, and has an external shape in which a flange 31 is formed at the base end of the neck 24 having the same shape as the inner bottle. . The peripheral edge 32 of the flange 31 is formed to be thin. Below the flange 31 is a portion (hereinafter, blow-molded portion 33) that finally becomes a storage portion (see reference numeral 33 in FIG. 1). Next, as shown in FIG. 2B, the parison 30 is inserted into the outer bottle 10 and the parison 30 is disposed at a predetermined position in the outer bottle 10. Here, the peripheral edge 32 of the flange 31 of the parison 30 is disposed in the outer bottle 10 in a state where the parison 30 is aligned by engaging with the step 12 formed on the inner peripheral side of the opening 13 of the outer bottle 10. The When the blow molding part 33 below the flange 31 is blow-molded by the well-known cold parison method, the area that was initially the flange 31 is the shoulder part of the inner bottle 20 as shown in FIG. 26, and the thin portion of the peripheral edge 32 of the flange 31 remains as the peripheral edge 27 of the shoulder portion 26. And the blow molding part 33 is shape | molded as the accommodating part 23, the outer surface 28 of the accommodating part 23 closely_contact | adheres to the inner surface 14 of the outer bottle 10, and the double bottle container 1 is completed.

  FIG. 3 shows an example of a double bottle container production line. On the production line 200, the heating process s1, the parison arrangement process s2, and the blow molding process s3 are performed. In this example, the outer bottle 10 and the parison 30 are in an inverted state in which the opening (13, 21) side is directed vertically downward. Is supplied on the production line 200. The relative vertical relationship is defined in the same manner as in FIG. 1 and FIG. That is, in FIG. 3, the vertically lower side is the upper side of the double bottle container.

  First, the parison 30 supplied to the production line 200 in an inverted state while being fixed by the jig 201 is heated to a deformable state in the subsequent blow molding step s3 by the heating step s1 by the heater 202. In the next parison arrangement step s2, the outer bottle 10 in an inverted state is mounted on the heated parison 30 from vertically above. At this time, the peripheral edge of the flange 31 of the parison 30 (see FIG. 2, reference numeral 32) engages with a step (see FIG. 2, reference numeral 12) formed on the upper end surface 11 of the outer bottle 10. Thereby, the blow molding part 33 of the parison 30 is inserted into the outer bottle 10 in a positioned state. In the blow molding step s3, the outer bottle 10 is fixed in the mold 203 while blow molding is performed on the parison 30 to mold the parison 30 into an inner bottle (FIGS. 1, 2, and 20). Schematically, an extension rod (not shown) is attached to the blow molding portion 33 of the parison 30 from above (vertically below) to below (vertically above) through the opening (FIG. 2, reference numeral 21) of the parison 30. The parison 30 is inserted inward to extend the parison 30 downward (vertically upward), and the compressed air guided to the surface of the rod through the inside of the extension rod is introduced into the parison 30 so that the parison 30 is placed in the outer bottle. 10 is molded into an outer shape along the inner shape. Thereby, the double bottle container 1 shown in FIGS. 1 and 2C is completed. The blow molding procedure and the like are described in detail in Non-Patent Document 1.

  Thus, according to the manufacturing method of the double bottle container of a present Example, the inner surface shape of an outer bottle is functioned as a metal mold | die for blow molding of an inner bottle. Therefore, an inner bottle can be arrange | positioned in the outer bottle which can shape | mold the inside and outside shape freely by injection molding. And even if the inner surface shape of an outer bottle is complicated, the outer surface of an inner bottle can be closely_contact | adhered along the inner surface shape of an outer bottle. Therefore, it is possible to provide a double bottle container having high quality and excellent aesthetics. Of course, like an overmolded container, the outer bottle is not molded by injecting molten resin outside the blown inner bottle in the mold, so the inner bottle may be deformed by heat or pressure during injection molding. Absent. Especially in overmolded containers, when forming a thick outer bottle with a glass-like bottom like a container used for high-end cosmetics, etc., there is a large bias in the amount of molten resin around the inner bottle. It is difficult to maintain the original shape. In other words, the inner surface shape of the outer bottle is also deformed by the deformation of the inner bottle. As a matter of course, as in the invention described in Patent Document 2, if the outer bottle is also blow-molded, it is extremely difficult to form the outer bottle having a partially different thickness. In addition, what is necessary is just to shape | mold an inner bottle using the injection blow method, and it is good also as shape | molding instead of said cold parison method by a hot parison method.

=== Other Embodiments ===
In the production line 200 shown in FIG. 3, the parison 30 and the outer bottle 10 are transported in an inverted state, but may be transported in an upright state. However, since the parison is inserted from the opening end side of the outer bottle, when the parison is transported in an upright state, the outer bottle is kept in an upright state on or near the production line, and the parison is once moved upward. Then, it is necessary to insert the parison from above into the waiting outer bottle, and then transport the outer bottle and parison to the next process location. Therefore, the transportation path in the production line is complicated, and the cost for the production equipment is increased. On the other hand, if the parison is transported in an inverted state, it is only necessary to keep the outer in an inverted state on the upper side of the production line, and the transport route is simplified, resulting in a high-quality, aesthetically pleasing double bottle container. It can be provided at a lower cost.

  In the double bottle container 1 shown in FIG. 1, the peripheral edge 27 of the shoulder portion 26 of the inner bottle 20 has a structure that engages with a step formed on the opening peripheral edge of the outer bottle 10. That is, as shown in FIG. 2, the parison 30 is aligned with the outer bottle 10 by engaging the peripheral edge 32 of the flange 31 of the parison 30 with the step 12 of the outer bottle 10. However, when the steps of the outer bottle and the peripheral edge of the shoulder of the inner bottle are engaged, the contact area between the inner bottle and the outer bottle is small, and it is difficult to extremely increase the alignment accuracy. Therefore, it is conceivable to improve the alignment accuracy by devising an engagement structure between the flange of the inner bottle and the upper end surface of the outer bottle.

  FIG. 4 shows an example of the engagement structure between the flange of the parison and the upper end surface of the outer bottle. FIG. 4 shows an enlarged longitudinal sectional view of a region related to the engagement structure. First, in the engagement structure shown in FIG. 4A, a protrusion 53 that protrudes downward and circulates is formed on the lower surface 52 of the flange 51 of the parison 50, and the outer peripheral surface 54 of the protrusion 53 is the inner surface of the outer bottle 40. 14 is in contact with the upper end region 41 of FIG. In this example, the shape of the upper end region 41 of the inner surface 14 is formed along the shape of the outer peripheral surface 54 of the protrusion 53 of the flange 51. 4B, the protrusion 73 formed on the lower surface 72 of the flange 71 of the parison 70 is inserted into the groove 61 formed around the upper end surface 11 of the outer bottle 60. In the engagement structure shown in FIG. ing. Thus, the alignment accuracy of a parison can be raised by engaging both so that the contact area of the flange of a parison and an outer bottle may become large. The protrusions (53, 73) may not be formed over the entire circumference of the lower surfaces (52, 72) of the flanges (51, 71), and may be formed in a part. In the example shown in FIGS. 4A and 4B, the upper end region 41 that engages with the protrusion 53 on the inner surface 14 of the outer bottle 40 may be provided intermittently corresponding to the protrusion 53. In the example shown in FIGS. 4C and 4D, the groove 61 in the upper end surface 11 of the outer bottle 60 may be formed intermittently. Thereby, when the inner bottle is strongly twisted around the shaft, the inner bottle can be prevented from rotating. Of course, in the production line, if sufficient alignment accuracy is obtained on the device side used in the process of arranging the parison in the outer bottle, the flange and the outer bottle are not molded into a shape that engages with each other. May be. Even if the parison is not provided with a flange, if the inner surface shape of the mold used in the blow molding process conforms to the shape of the final double bottle container, the flange is not necessary. However, when the alignment is ensured on the manufacturing apparatus side, the manufacturing apparatus is naturally expensive. Therefore, it is easier to suppress the manufacturing cost of the double bottle container by securing the alignment accuracy by using a parison or an outer bottle which is an inexpensive injection molded product.

  In the manufacturing method according to the embodiment, since the opening of the outer bottle is blocked by the flange of the inner bottle when the parison is inserted into the outer bottle, the closed space is formed by the lower surface of the flange, the outer surface of the parison, and the inner surface of the outer bottle. It is formed. Therefore, as the outer shape of the parison gradually expands during blow molding, the pressure in the enclosed space increases, and the parison becomes difficult to be gradually deformed. Therefore, complicated control may be required, such as gradually increasing the pressure of the compressed air introduced into the parison. Therefore, a ventilation path that connects the closed space and the outside of the outer bottle may be provided at a suitable portion of the flange of the parison or the outer bottle. FIG. 5 shows an example of a parison having a ventilation path in the flange. Here, the parison is shown by a perspective view seen from below. The parison 80 shown in FIG. 5 has a protrusion 83 formed on the lower surface 82 of the flange 81 as in the parison 50 shown in FIG. However, a groove (hereinafter referred to as a ventilation groove 84) that extends radially from the inner peripheral side toward the outer peripheral side is formed on the lower surface 82 of the flange 81. The ventilation groove 84 crosses the protrusion 83 formed on the lower surface 82 of the flange 81 and opens at the edge 85 of the flange 81. FIG. 6 shows a state in which the parison 80 is disposed in the same outer bottle 40 as that shown in FIG. As shown in FIG. 6, the closed space 100 formed by the outer surface 34 of the blow molding portion 33 and the inner surface 14 of the outer bottle 40 in the parison 80 is formed through the ventilation groove 84 formed in the flange 81. The outside of the bottle 40 is in contact. As a result, the pressure in the closed space 100 can escape to the outside through the groove 84, and control related to blow molding is facilitated, and as a result, it can be expected to provide a double bottle container at a lower cost. Even if the groove is not formed on the flange of the parison but is formed on the upper end surface of the outer bottle, the same effect can be obtained. Grooves can also be formed on both the lower surface of the flange and the upper surface of the outer bottle. Of course, a vent hole that communicates the inside and the outside may be provided on the side surface or bottom surface of the outer bottle, or a vent hole may be provided so as to penetrate the flange of the parison in the vertical direction. However, considering the aesthetics of the double bottle container, it is desirable to provide a grooved vent on the lower surface of the parison flange and the upper end surface of the outer bottle. After blow molding, the inner bottle is blown inside the closed space, the outer surface of the inner bottle is in close contact with the inner surface of the outer bottle, and the end of the groove opened in the closed space is closed. For this reason, liquid does not enter the interface between the inner bottle and the outer bottle from the outside of the outer bottle. In addition, even if it forms the vent which connects an upper surface and a lower surface to the flange of a parison, the air in the said closed space can be exhausted out of an outer bottle at the time of a blow molding process.

  In the double bottle container, since the inner bottle is blow-molded in the outer bottle, the outer surface of the inner bottle and the inner surface of the inner bottle are in close contact with each other but are not fixed to each other in a compatible state. Therefore, for example, if the inner bottle protruding from the upper end surface of the outer bottle is strongly pulled upward, or the neck is relatively strongly twisted with respect to the outer bottle, the position of the inner bottle may be shifted in the outer bottle. Therefore, a concave portion may be formed on the inner side surface (inner peripheral surface) of the hollow cylindrical outer bottle, and the outer side surface (outer peripheral surface) of the inner bottle may be engaged with the concave portion. FIG. 7 is a view showing a double bottle container formed so that the outer peripheral surface of the inner bottle and the inner peripheral surface of the outer bottle are engaged. Here, the parison 50 shown in FIG. 4 (A) is used. Yes. 7A and 7C are views showing the shapes of the outer peripheral surface 35 of the parison 50 or the outer surface 28 of the inner bottle 150 and the inner surface 14 of the outer bottle 40 before and after blow molding, respectively. 7 (B) and FIG. 7 (D) are enlarged views of circle 4 in FIG. 7 (A) and circle 5 in FIG. 7 (B). As shown in FIGS. 7A and 7B, the inner peripheral surface 15 of the outer bottle 90 is formed with a recess 91 at a proper position, as shown in FIGS. 7C and 7D. When the inner bottle 150 is formed by blow molding, the outer peripheral surface 29 of the inner bottle 150 is brought into close contact with the shape of the recess 91, and the outer peripheral surface 29 of the inner bottle 150 and the inner peripheral surface 15 of the outer bottle are formed. The double bottle container 1 is completed in a state of being engaged at the points. Thereby, it is possible to reliably prevent the inner bottle 150 from being displaced in the outer bottle 90. If a plurality of the concave portions 91 of the inner surface 14 of the outer bottle 90 are provided in a direction around the shaft 2, the rotation of the inner bottle 150 can be prevented similarly to the intermittent protrusion described above. In addition, if the unevenness | corrugation which also serves as a design is formed in the inner peripheral surface of an outer bottle, the position shift and rotation of an inner bottle can also be prevented using the unevenness | corrugation.

  If a decorative film is placed on the inner peripheral surface of an outer bottle made of light-transmitting resin, and a parison is placed in the outer bottle and blow molding is performed, the inner decoration that can be seen from the outside of the outer bottle It can be applied to the interface between the bottle and the outer bottle. In this case, unlike the decoration in the overmolded container, the decoration design does not collapse or flow. In other words, in the overmolded container, the outer bottle is injection molded with the decorative film placed on the outer peripheral surface of the molded inner bottle, so the decorative film is deformed by heat and pressure during injection molding, and the decorative design is It collapses or part of the film flows with the molten resin. On the other hand, if the manufacturing method of the above-mentioned embodiment is diverted, the decorative film is simply sandwiched between the outer peripheral surface of the inner bottle and the inner peripheral surface of the outer bottle, so that it is possible to easily apply a decoration with a beautiful appearance. It becomes possible.

  Note that the outer shape of the outer bottle is not limited to a cylindrical shape, and may be an appropriate shape such as a rectangular tube shape, a spherical shape, or a wine glass shape if an opening is formed on the upper end side. An appropriate shape can be adopted as the inner shape of the outer bottle. Moreover, the decoration which consists of uneven | corrugated of a fine engraving pattern shape may be formed in the inner surface and outer surface of an outer bottle by the injection molding process, the cutting process after injection molding, etc., for example. The outer bottle may be formed of a soft resin.

1 Double bottle container, 10, 40, 60, 90 Outer bottle,
11 Upper end surface of the outer bottle, 12 Steps on the outer peripheral edge of the outer bottle,
13 Opening of outer bottle, 14 Inner surface of outer bottle,
15 Inner peripheral surface of outer bottle, 20,150 inner bottle,
21 Opening of the inner bottle, 23 storage, 24 neck,
26 shoulder part of inner bottle, 27 peripheral edge of shoulder part, 30, 50, 70, 80 parison, 31, 51, 71, 81 parison flange, 52, 72, 82 bottom face of flange,
53, 73 A protrusion on the lower surface of the flange, 61 a groove on the upper end surface of the outer bottle, 85 a groove for ventilation, 91 a recess on the outer peripheral surface of the outer bottle

Claims (12)

A method for manufacturing a double bottle container in which an inner bottle in which contents are stored is arranged inside an outer bottle made of an injection molded product of a resin having an opening at the upper end,
Using the bottomed cylindrical parison that is injection molded as a precursor of the inner bottle having the opening at the upper end and the outer bottle molded into a predetermined shape,
A heating step for heating the parison;
A parison placement step for placing the parison heated inward of the outer bottle in a positioned state;
By molding the parison by the injection blow method while fixing the outer bottle in a state where the parison is arranged in the inner side in a mold having an inner surface shape along the outer diameter of the double bottle container, A blow molding step for forming the inner bottle, the outer surface of which is formed in a shape along the inner shape of the outer bottle;
Including
The parison includes a flange projecting radially in the vertical direction on the way from the opening at the top to the bottom at the bottom,
In the parison arrangement step, the peripheral lower surface of the flange is brought into contact with the upper end surface of the outer bottle,
A method for producing a double bottle container.   2. The double bottle according to claim 1, wherein a peripheral edge of the opening is notched and a step is formed on an upper end surface of the outer bottle, and the peripheral edge of the flange is engaged with the step in the parison placement step. Manufacturing method of bottle container.   3. The lower surface of the flange according to claim 1, wherein a protrusion protruding downward is formed around the flange, and an outer peripheral surface of the protrusion and an inner peripheral surface on the opening end side of the outer bottle are engaged with each other. A method of manufacturing a double bottle container, wherein the outer peripheral surface of the protrusion is brought into contact with the inner peripheral surface of the outer bottle on the opening end side in the parison arrangement step.   4. The protrusion according to claim 3, wherein the protrusion is intermittently formed at a plurality of locations, and the shape of the inner peripheral surface on the opening end side of the outer bottle is a region corresponding to the outer peripheral surface of the protrusion. A method for producing a double bottle container, wherein the method is formed into a shape along the outer peripheral surface of the protrusion. In claim 1 or 2,
A protrusion protruding downward is formed around the lower surface of the flange, and a groove into which the protrusion is inserted is formed around the upper end surface of the outer bottle,
In the parison arranging step, the protrusion is inserted into the groove.   6. The double bottle according to claim 5, wherein the protrusion is intermittently formed at a plurality of locations, and the groove of the outer bottle is intermittently formed in a region corresponding to the formation location of the protrusion. Container manufacturing method.   7. The outer bottle according to claim 2, wherein the outer bottle has an inner surface of the outer bottle, an outer surface of the parison, and the parison in a state where the parison is disposed in the outer bottle by the parison arrangement step. A method for manufacturing a double bottle container, characterized in that a vent path is formed to connect a closed space formed by the lower surface of the flange and the outside of the outer bottle.   In any one of Claims 2-5, while the groove | channel extended in a radial outward direction is formed in at least one of the lower surface of the said flange or the said upper end surface of the said outer bottle, the said groove | channel is the said parison arrangement | positioning step. A closed space formed by the inner surface of the outer bottle, the outer surface of the parison, and the lower surface of the flange of the parison, with the parison disposed in the outer bottle, and the outer side of the outer bottle A method for producing a double bottle container, wherein   The parison according to any one of claims 2 to 5, wherein the parison includes a vent that communicates a lower surface and an upper surface of a flange, and the parison is disposed in the outer bottle by the parison placement step. A double space characterized in that a closed space formed by the inner surface of the outer bottle, the outer surface of the parison, and the lower surface of the flange of the parison communicates with the outer side of the outer bottle through the vent. Manufacturing method of bottle container.   In any 1 item | term, the recessed part is formed in the inner peripheral surface of the said outer bottle, In the said blow molding step, the outer peripheral surface of the said inner bottle is engaged with the said recessed part, It is characterized by the above-mentioned. A method of manufacturing a double bottle container.   In any one of Claims 1-10, including the step which arrange | positions a decorating film in the internal peripheral surface of the said outer bottle, In the said blow molding step, the said outer peripheral surface of the said inner bottle and the internal peripheral surface of the said outer bottle are concerned. A method for producing a double bottle container, characterized by sandwiching a decorative film. It is a double bottle container manufactured by the method in any one of Claims 1-11, Comprising: The inner bottle which consists of blow molding goods is arrange | positioned in the outer bottle which consists of injection molding goods, The said inner bottle is an upper end Has a shape in which the storage portion of the contents is continuous through the neck at the lower end, and the neck protrudes to the upper end side of the outer bottle,
The storage portion has a shoulder portion continuous from the lower end of the neck portion to the outer peripheral surface exposed from the upper end surface of the outer bottle, and a region extending from the outer peripheral surface to the bottom surface is in close contact with the inner surface of the outer bottle.
A double bottle container characterized by that.

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