JP5768390B2 - Manufacturing method of composite container - Google Patents

Description

The present invention relates to a method of manufacturing a composite container for the outer container made of plastic inner container and paper are combined.

  Conventionally, in order to reinforce a plastic container which has been reduced in thickness and weight, a composite container whose outer side is covered with a paper container is known (for example, see Patent Document 1).

  The composite container disclosed in Patent Document 1 accommodates a thin plastic inner container in which a spout part is inclined according to the inclination of the inclined part in an outer container having an inclined part at the upper part. The outlet portion protrudes from the inclined portion of the outer container.

JP-A-8-133338

  Although the composite container of Patent Document 1 is inclined to the spout portion utilizing the fact that the inner container is formed from a thin wall and is easy to deform, the entire inner container is formed from a thin wall, If the spout portion is inclined, the overall shape is destroyed, and it is difficult to incline only the spout portion, resulting in poor assembly.

  In addition, the inner container bends in a complicated manner especially around the spout portion, and liquid residue tends to be generated at the bent portion.

The present invention has been made in view of such problems and the like, and an object thereof is to provide a method of assembly is easy liquid remains is less likely to composite containers.

  In order to solve the above problems, the present inventors adopt the following configuration.

  In addition, although the referential mark of drawing is attached | subjected with a parenthesis, this invention is not limited to this.

That is, in the invention according to claim 1 , after the outer container is mounted on the molding die, the inner container molding is performed such that the spout portion protrudes outside the molding die and the main body portion is arranged inside the outer container. In the method for manufacturing a composite container having a spout part by blow-molding after mounting the preform, the mold has an opening for mounting the preform and the spout part. A space part formed by inclining the outer frame of the outer container with respect to the axis of the spout part so as to be inclined obliquely on the upper end surface of the outer container, and the outer container A notch into which the main body portion of the preform can be inserted is formed from the upper end surface of the outer container to the side surface adjacent to the upper end surface, and the preform is attached to the mold after the outer container is mounted. Space by the notch Through said body portion is inserted into the outer container, characterized in that it is mounted in the opening.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to produce efficiently the composite container in which the assembly was easy and the liquid residue was hard to be left and the spout part inclined and formed.

2 is a perspective view showing a composite container according to Embodiment 1. FIG. It is a longitudinal cross-sectional view of the composite container shown in FIG. It is a perspective view of an inner side container. It is a figure for demonstrating the process at the time of accommodating an inner container in an outer container. It is an expanded view of an outer side container. It is a figure which shows an example of the metal mold | die at the time of manufacturing an inner side container. 10 is a perspective view showing a composite container according to Embodiment 2. FIG. It is a figure which shows an example of the metal mold | die at the time of manufacturing a composite container.

  The form for implementing this invention is demonstrated below.

—Embodiment 1—
As shown in FIGS. 1 and 2, the composite container includes an inner container 1 made of plastic and an outer container 2 made of paper, and the inner container 1 is integrally formed by covering the outer container 2. One container.

  The inner container 1 is made using a transparent, translucent or opaque plastic material. As shown in FIG. 3, the inner container 1 has a cylindrical barrel portion 6 formed in a straight line, and an upper end portion of the barrel portion 6 has a spout portion 7 in an inclined state in advance. Is formed. As shown in FIG. 3, the axis of the bottomed parison 45 to be described later is L, the axis connecting the corner of the inner container from the intersection X where the root of the spout 7 intersects the axis L is M, and L and M From the viewpoint of blow moldability, it is desirable that −5 ° ≦ θ ≦ 5 °, and more desirably −3 ° ≦ θ ≦ 3 °.

  Although not shown in the drawings, the body portion 6 includes a rectangular bottom body and a side body 6a formed so as to hang upward from the outer periphery of the bottom body. The body portion 6 is formed in a curved shape so that the side body 6 a is narrowed inward at the upper portion, and communicates with the inside of the spout portion 7.

  On the other hand, the spout part 7 is formed in a substantially cylindrical shape and is formed integrally with the body part 6. A male screw 7 a that can be screwed with a female screw of a cap (not shown) is formed on the outer peripheral surface of the spout part 7, and a collar part 7 b that protrudes outward over the outer periphery is formed below the male screw 7 a.

  The body portion 6 is formed to be thin, and predetermined grooves 11 are formed at equal intervals in the vertical direction of the body portion 6 so as to go around the periphery of the body portion in a substantially horizontal direction. That is, as shown in FIG. 2, in the longitudinal section of the body portion 6, the side body 6 a is formed in an uneven shape in the vertical direction. In addition, the shape of the said groove | channel 11 is an example, and is not limited to this shape.

  By forming such a groove 11 in the body portion 6, it is possible to easily increase the rigidity of the body portion 6 formed with a thin wall. Therefore, the body 6 is difficult to bend even if a slight external force is applied, and can easily retain its original shape without breaking its shape.

  As shown in FIG. 4, the inner container 1 formed in this way is inserted into a box-shaped outer container 2 having an opening at the top, and then the opening is closed to produce a composite container. . Thus, since the spout part 7 of the inner container 1 of the present embodiment is previously inclined with respect to the body part 6, the spout part 7 is bent and inserted into the outer container 2 as in the prior art. Therefore, it is possible to efficiently produce a composite container in which assembly is easy and the spout portion 7 is inclined.

  Further, the corner portion of the body portion 6 is chamfered, and this chamfering is effective in preventing overstretching during blow molding.

  Further, since the inner container 1 is accommodated in the outer container 2 while maintaining its original shape, and the inflow path from the spout portion 7 to the inside of the inner container 1 is formed with a gentle slope, the inner container 1 No. 2 has a shape that makes it difficult for the liquid to remain.

  Further, as shown in FIG. 2, the cap 5 has a bottomed cylindrical base 5a having an opening at one end. Inside the base body 5a, a female screw 5b for screwing with a male screw 7a formed in the spout 7 is formed. The cap 5 is rotated in a predetermined tightening direction with the opening side facing the spout portion 7, whereby the male screw 7 a and the female screw 5 b are engaged to seal the inside of the inner container 1.

  Here, as a plastic material used as the material of the inner container 1, PET, polypropylene, polylactic acid (PLA), and other various thermoplastic resins can be used. Moreover, gas barrier properties, such as oxygen of a composite container, can be improved by making the inner side container 1 into a multilayer, for example, the three-layer structure of PET / polyamide type synthetic resin / PET.

  The outer container 2 is made of a sheet mainly made of paper, and as shown in FIG. 2, the outer container 2 has a rectangular cylindrical body 2a that is in close contact with the body 6 of the inner container 1 from the outside. The lower end of the body portion 2a of the outer container 2 is closed by a lower end piece 2b, and the upper end is formed of a pair of inclined roof portions 21 facing each other and gables (mountain walls at both ends of the gable roof) as shown in FIGS. A gable roof is formed by the upper side surface 22 corresponding to the portion. One inclined roof portion 21 is formed with an opening 20 for inserting the spout portion 7 therethrough.

  Specifically, the outer container 2 is formed by assembling a development carton 25 as shown in FIG. The developing carton 25 is formed by punching a sheet mainly made of paper. A plastic layer, a metal foil layer, or the like is laminated on the front surface or the back surface of the paper sheet as necessary. In addition, desired contents are printed on the surface of the sheet.

  As shown in FIG. 5, the unfolding carton 25 includes a first body wall 26, a second body wall 27, a third body wall 28, and a fourth body that are connected via a vertical broken line indicated by a broken line. It has a wall 29. A glue piece 30 is continuously provided on the fourth body wall 29 via a vertical folding line. The gluing piece 30 is folded along a vertical fold line, and the body walls 26 to 29 are folded and sealed along the vertical fold line, whereby the body portion of the outer container 2 is formed.

  Of the barrel walls 26 to 29 forming the barrel portion 2a of the outer container 2, the upper portions of the opposite first and third barrel walls 26 and 28 are opposed to each other via the top horizontal folding line. A pair of gable roof forming walls 26a and 28a are continuously provided as an inclined roof portion 21 in which an opening 20 for inserting the outlet portion 7 is formed. A first upper seal piece 31 is connected to the upper portion of the one gable roof forming wall 28a via a seal horizontal folding line.

  In addition, among the body walls 26 to 29 forming the body part 2a of the outer container 2, the other opposing second and fourth body walls 27 and 29 are opposed to each other via a top horizontal folding line. A pair of triangular wall surfaces 27a and 29a as the upper side surface 22 are continuously provided. A second upper seal piece 32 is connected to the upper part of each side of the pair of end wall forming walls 27a and 29a via a seal fold line.

  Then, the pair of gable roof forming walls 26a, 28a are folded along the top horizontal folding line, and the first upper seal piece 31 and the second upper seal piece 32 are sealed at a predetermined position, whereby the top of the gable roof type is formed. It is formed. Note that an adhesive may be used for the seal, and means such as heat welding is used when the material of the developing carton 25 is polyethylene-coated paper or the like.

  On the other hand, a first lower seal piece 33 is connected to the lower portions of the first and third body walls 26 and 28 via seal fold lines, respectively. The bottom wall 34 as the lower end piece 2b is continuously provided via the bottom horizontal folding line, and further, the second lower seal piece 35 is continuously provided at the lower portion of the bottom wall 34 via the seal folding line. . Then, the bottom wall 34 is folded at the bottom horizontal fold line, and the first and second lower seal pieces 33 and 35 are folded at the seal fold line, respectively, and sealed at a predetermined position to be sealed. Is formed.

  In addition, as shown in FIG. 5, the development carton 25 is appropriately formed with a cut line 37 by a perforation, a zipper or the like so as to cross the first to fourth body portions 26 to 29. By providing this score line, when the composite container is discarded, the outer container 2 is easily cut off along the score line by pulling the score line so that it is easily separated from the inner container 1.

  As described above, in this composite container, since the outer surface of the inner container 1 is covered with the outer container 2 and the inner container 1 is reinforced by the outer container 2, the amount of plastic used for the inner container 1 is reduced. The wall thickness of the inner container 1 can be reduced.

  Moreover, since the spout part 7 has inclined previously the inner side container 1 of this embodiment, the attachment to an outer side container is easy, and it is possible to produce a composite container efficiently.

  Further, the inner container 1 is accommodated in the outer container 2 while maintaining its original shape, and the inflow path from the spout 7 to the inside of the inner container 1 is formed with a gentle slope, so that the liquid residue It is possible to obtain a composite container that is difficult to peel.

  Next, a method for manufacturing the composite container will be described. In addition, since the injection molding machine and blow molding machine mentioned later are conventionally well-known, the detailed description shall be abbreviate | omitted.

  The inner container 1 is made of, for example, a predetermined plastic, and is molded as a bottomed parison 45 (preform for molding the inner container of the present application) by an injection molding machine. In a biaxially stretched orientation blow molding with high-pressure air.

  As shown in FIG. 6, the blow molding die 40 is formed in a split shape, and a mold 46 for forming the spout part 7 and the body part 6 of the inner container 1 is formed in each of the molds 40 a and 40 b. 47 is formed. The mold 46 that holds the spout portion 7 is formed so that the extending direction of the extending rod by blow molding and / or the air ejection direction and the axis L of the spout portion 7 are in the same direction. On the other hand, the formwork 47 of the trunk portion 6 is formed so that the trunk portion 6 is inclined with respect to the axis L of the spout portion 7. Further, the corners of the body 6 are chamfered (curved). This chamfering was confirmed to be effective in preventing overstretching during blow molding.

  In addition, if the angle θ formed by the axis L, the intersection X where the axis L intersects the root of the spout 7 and the axis M connecting the corners of the inner container is large, molding defects or overstretching may occur during blow molding. Therefore, −5 ° ≦ θ ≦ 5 ° is desirable, and −3 ° ≦ θ ≦ 3 ° is more desirable.

  The bottomed parison 45 is an inlet through which air is blown out, and is attached to the mold 46 of the spout 7 and is manufactured by biaxially stretched orientation blow molding with high-pressure air as described above. .

  On the other hand, the outer container 2 is assembled in advance in a box shape with the upper part opened as shown in FIG. 7 by a generally used box making machine.

  And the inner container 1 in which the spout part 7 obtained by blow molding as described above is inclined is inserted from the opening of the outer container 2 and described in the process of forming the top of the gable roof mold using FIG. 6 described above. As described above, the composite container is manufactured by closing the opening of the outer container 2.

  Finally, the content liquid is filled from the spout 7 and the spout 7 is closed with the cap 5.

-Embodiment 2-
The composite container in the first embodiment is manufactured by inserting the inner container 1 into the outer container 2 after separately manufacturing the inner container 1 and the outer container 2, whereas the composite container in the second embodiment. Is different in that the outer container 2A is manufactured by mounting the outer container 2A on a blow molding die and blow molding in this state. Therefore, in the manufacturing method of the composite container in the present embodiment, it is possible to omit the process of inserting and assembling the inner container into the outer container as shown in the first embodiment, and the manufacturing process and manufacturing cost can be reduced.

  An example of the manufacturing method of the composite container of this embodiment is demonstrated. In addition, since the injection molding machine and blow molding machine mentioned later are conventionally well-known, the detailed description shall be abbreviate | omitted. In addition, in FIG.7 and FIG.8, the same code | symbol is attached | subjected to the part which is common in FIGS. 1-6, and those description is abbreviate | omitted.

  First, in the composite container manufacturing method of the present embodiment, the outer container 2A is manufactured by a sheet mainly made of paper. Although the manufacturing method of the outer container is not specifically illustrated, for example, the outer container 2A is different from the present embodiment in the formation position of the opening 20 (the notch 51 in the present embodiment) in the first embodiment. The unrolled carton 25 as shown in FIG. 5 of the first embodiment is formed and then assembled.

  As shown in FIG. 7, the outer container 2 </ b> A has a square cylindrical body 2 a. The lower end of the body 2a is closed by a lower end piece (not shown), and the upper end is formed by a pair of inclined roof portions 21 facing each other and an upper side surface 22 corresponding to a gable (an angled wall portion at both ends of the gable roof). It is formed in a shape.

  In the outer container 2A of the present embodiment, a notch 51 for inserting a bottomed parison 45 (preform for forming an inner container of the present application) to be described later is formed. This notch 51 in the present embodiment is formed from the front inclined roof portion 21 to the right trunk wall 22 of the trunk portion 2 a adjacent to the inclined roof portion 21. As a result of forming the notch 51 in this way, when the outer container 2A is mounted on the mold 47 of the blow molding die 55, the bottomed parison 45 does not interfere with the outer container 2A through the space by the notch 51, It can be attached to the opening 56 formed in the blow molding die 55.

  In addition, while manufacturing the outer container 2A, a plastic bottomed parison 45 is formed by injection molding or the like. The bottomed parison 45 has a spout part 7 and a main body part. The spout part 7 projects outside a blow molding die 55 described later, and the main body part is disposed inside the outer container 2A. In this manner, the blow molding die 55 is mounted in the opening 56. A number of the bottomed parisons 45 are produced in advance.

  As shown in FIG. 8, the outer container 2A is mounted on a mold 47 of blow molding dies 55a and 55b (55) formed in a split shape. The blow molding die 55 is provided with an opening 56 for mounting the upper part that functions as the spout 7 of the bottomed parison 45 heated to a predetermined temperature in a protruding state, and the opening 56. A mold 47 having a space 57 in which the body 2a of the outer container 2A is mounted is formed.

  As shown in the first embodiment (see FIG. 3), the mold 47 has a direction in which the extending rod and / or the direction of air blowing by blow molding and the axis L of the spout 7 are in the same direction. Formed to be. On the other hand, the outer frame of the outer container 2A is inclined with respect to the axis L of the spout part 7 so that the spout part 7 is inclined and arranged on the upper end surface of the outer container 2A. Is formed. As described in the first embodiment, when the angle θ formed by the axis L, the intersection X where the axis L intersects the root of the spout 7 and the axis M connecting the corners of the inner container is large. In addition, defects such as poor shaping and overstretching tend to occur during blow molding, so −5 ° ≦ θ ≦ 5 ° is desirable, and −3 ° ≦ θ ≦ 3 ° is even more desirable.

  As shown in FIG. 8, the blow molding die 55 of the present embodiment is configured such that the outer container 2A is mounted in the space portion 57 of the mold 47 of one die 55a and the spout portion 7 protrudes to the outside. After the bottomed parison 45 is attached to the opening 56, the other mold 55b is closed, and then biaxially stretched orientation blow molding is performed with high-pressure air, whereby a composite container is manufactured.

  The composite container manufactured in this manner is efficient without requiring a step of integrating the inner container and the outer container into a composite container in which the liquid residue is difficult to be formed and the spout portion 7 is inclined. It is possible to produce well.

  Note that the present invention can be implemented in various forms without being limited to the above-described embodiments and examples.

  For example, in the embodiment of the present invention, the shape of the composite container is a quadrangular prism. However, the shape is not limited thereto, and other shapes such as a cylinder, a triangular prism, and a pentagonal prism can be used. Further, the cap may be mounted in various forms in addition to those using threads.

DESCRIPTION OF SYMBOLS 1 ... Inner container 2 ... Outer container 6 ... trunk | drum 7 ... spout part 8 ... recessed part

Claims (1)

After the outer container is mounted on the mold, blow molding after mounting the preform for inner container so that the spout part protrudes outside the mold and the main body is placed inside the outer container In the manufacturing method of a composite container for manufacturing a composite container with a spout part by
The mold is
An outer frame of the outer container is formed to be inclined with respect to the axis of the spout part so that the opening for mounting the preform and the spout part are inclined to the upper end surface of the outer container. And a space portion formed,
In the outer container, a notch into which the main body portion of the preform can be inserted is formed from the upper end surface of the outer container to the side surface adjacent to the upper end surface ,
The composite is characterized in that, after the outer container is mounted on the mold, the main body portion is inserted into the outer container through a space formed by the cutout and is mounted on the opening. Container manufacturing method.