JP2005047557A - Double container and method for molding it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a double container exhibiting a heat insulating function simply at a low cost while an appearance and a style of an ordinary bottle body are kept by constituting the double container with a gap exhibiting a heat insulating action as an integrally molded article. <P>SOLUTION: The double container is constituted into a bottle body shape as a double wall structure wherein an upper end is integrally connected from the shoulder part 4 to the body part 7 and at least the body part 7 section has the double wall structure having the gap 12 between them. As an integral structure wherein the upper ends of the double wall structure are mutually and integrally connected to a mouth cylinder part is provided, it is possible to keep the appearance and the style similar to the ordinary bottle body and to handle it simply. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a blow-molded casing-shaped synthetic resin double container that exhibits a heat insulating function and a molding method thereof.

  As a synthetic resin container that exhibits a heat insulating effect on the stored contents, the outer container body and the inner container body are combined with a gap formed between them, and between the outer container body and the inner container body. A double container in which a heat insulating action is obtained by the formed gap is known.

The double container having the above-described configuration combines the outer container body and the inner container body that have already been formed into a fixed shape, so that the structure can combine the outer container body and the inner container body. Generally, it is in the form of a bowl or cup.
JP 2002-282110 A

  In this case, the external shape and structure of the container are greatly limited, and basically a structure having a large opening, so that it is very unsuitable for storing and holding liquid. there were.

In order to eliminate this dissatisfaction, the outer container body and the inner container body are each molded into a box shape, and the upper half of the outer container body divided into two parts in the top and bottom is assembled to the inner container body at the mouth. The outer half of the outer container body is fixed to the inner container body and connected and fixed to the upper half of the outer container body to form a double container whose outer shape is a box shape. is there.
JP 2002-68324 A

  The double container having the outer shape of the casing can function properly as a liquid storage container in the same manner as a normal casing. This is achieved by assembling the inner container body in a fixed posture and connecting and fixing the other to one side while maintaining the assembled state constant.

  For this reason, there is a problem that at least three parts are required to manufacture one double container, and handling of the parts is complicated and troublesome.

  In addition, since the double container is completed by joining the outer container bodies that are divided into the upper and lower parts, the joint part of the outer container bodies is highly likely to deteriorate the appearance of the container. There is a problem that it is necessary to conceal the mating portion, and the configuration is complicated accordingly, and the manufacturing cost of the container is increased.

  That is, when forming a double container in the shape of a casing, it is necessary to divide the outer container body into at least two parts so that the inner container body can be inserted and assembled into the outer container body.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and it is a technical problem to construct a double container having a gap that exhibits a heat insulating action as an integrally molded product. An object of the present invention is to make it possible to manufacture a double container exhibiting a heat insulation function with ease and at a low cost while maintaining the appearance of a normal casing.

Among the present invention for solving the above technical problems, the means of the invention according to claim 1
It is a double container made of synthetic resin that is blow-molded in a box shape by connecting a mouth tube part continuously through the shoulder part to the upper end of the trunk part with the lower end closed at the bottom part,
A double wall structure in which the upper end is integrally connected from the shoulder portion to the upper end portion, and at least the trunk portion has a gap therebetween;
It is in.

  In the first aspect of the invention, since at least the body portion has a double wall structure with a gap therebetween, the gap exhibits a heat insulating action, and the double container functions as a heat insulating container. Let

  Since the upper ends of the double wall structure part are integrally connected to each other and the mouth tube part, the appearance appearance is formed on this part, that is, the continuous part of the shoulder part and the mouth tube part. A line due to the combination surface that may be deteriorated does not appear, and a smooth outer surface is formed.

  Further, since the lower end of the outer cylinder is located at the lower end of the molded double container, the lower end of the outer cylinder hardly affects the appearance of the double container.

  In the invention according to claim 2, in the configuration of the invention according to claim 1, the lower end portion of the outer cylinder that is the outer wall of the trunk portion is a curled portion that is curved in a direction to close the lower end of the gap. It is added.

  In the invention according to the second aspect, since the space formed between the inner peripheral end of the curl portion and the barrel inner cylinder side becomes small, the barrel outer cylinder side and the barrel inner cylinder side are formed by the curl portion. The relative displacement with respect to the gap can be restricted and the open area downward of the gap can be reduced, so that the thermal insulation of the gap can be effectively exhibited, and the lower end of the molded double container Since the appearance of the section is rounded and the appearance is the same as that of a normal casing container, there is no fear that the lower end edge of the outer cylinder will harm the appearance of the container.

  The invention described in claim 3 is the configuration of the invention described in claim 1 or 2, in which the lower end of the trunk cylinder is densely connected to a portion from the trunk cylinder, which is the inner wall of the trunk, to the peripheral end of the bottom. This is in addition to the fact that the gap is made to have a sealed structure by adhesion and fixing.

  In the invention according to claim 3, since the lower end of the outer cylinder is bonded and fixed to the portion from the inner cylinder to the peripheral end of the bottom, the lower end of the outer cylinder is connected and fixed to the inner cylinder side. As a result, the outer cylinder side and the inner cylinder side are fixedly coupled to each other to maintain a stable mutual posture, and the air gap is hermetically sealed. There is no risk of a decrease in effectiveness.

  According to a fourth aspect of the present invention, in the configuration of the first, second or third aspect of the present invention, the shoulder inner cylinder as the inner wall of the shoulder, the trunk inner cylinder as the inner wall of the trunk, and the bottom This part is a biaxial stretch blow molding part.

  In the invention according to claim 4, since the portion for directly storing the contents is a portion formed by biaxial stretch blow molding, the improvement in physical properties accompanying biaxial stretch blow molding is imparted to this portion. In addition, since the thickness of this portion can be made sufficiently thin, the amount of resin material required to mold one container can be reduced.

  The invention according to claim 5 is obtained by adding a leg portion to the curl portion to the configuration of the invention according to claim 1, 2, 3 or 4.

  In the invention according to claim 5, since the bottom portion which does not have a double wall structure can be lifted from the floor surface, it is possible to obtain a heat insulating action for the bottom portion, Even if the portion composed of the inner cylinder and the bottom portion is formed thin, the seat function does not deteriorate.

In the present invention, the means of the invention described in claim 6 is:
Made of a synthetic resin that is blow-molded into a box-like structure, with a mouth tube part connected to the upper end of the trunk part with the lower end closed at the bottom, and a shoulder and trunk part with a double wall structure Being a method of forming a double container,
From the lower end of the mouth tube portion, a bottomed cylindrical main body portion comprising a shoulder equivalent portion, a trunk equivalent portion and a bottom equivalent portion, and a skirt tube portion forming a shoulder outer cylinder and a barrel outer cylinder of a double container Molding preforms that are connected in a hanging manner;
Blow molding the main body of this preform into a size that forms a gap between the outer cylinder of the skirt cylinder,
It is in.

  In the invention according to claim 6, since the gap is formed between the main body portion and the skirt tube portion by performing the blow molding process, a desired size of the gap can be freely formed. Thus, it is possible to set in advance the degree of the heat insulating effect obtained.

  Since the preform is an integrally molded product composed of the mouth tube portion, the main body portion, and the skirt tube portion, handling between parts such as assembly is not required at all, and the handling at the time of molding is simplified accordingly. .

  The invention according to claim 7 is the structure of the invention according to claim 6, wherein the lower end portion of the outer cylinder of the skirt tube portion is bent in a direction to close the lower end of the gap and is heat-formed into a curled portion. It is added.

  In this invention, since the curled portion is heat-molded after the blow molding of the main body portion, the curled portion does not interfere with the blow molding of the main body portion, and the curled portion is molded. Since the heat treatment at the time is applied only to the lower end of the skirt cylinder, there is no risk of adverse effects of heat on the blow-molded main body, specifically the cylinder inside and the bottom, and the curl is safely It can be thermoformed.

  According to an eighth aspect of the present invention, in the configuration of the sixth or seventh aspect of the present invention, the lower end of the outer cylinder is attached to a portion of the trunk portion from the blown inner cylinder to the peripheral end portion of the bottom portion. This is in addition to the above.

  In the invention according to claim 8, since the tight coupling and fixing of the outer cylinder to the inner cylinder side is an adhesive fixing by an adhesive, the peripheral end portion of the bottom from the inner cylinder which is a blow molded part It is possible to safely achieve the sealing of the air gap without adversely affecting the part between the two.

  The invention described in claim 9 is obtained by adding the structure of the invention described in claim 6, 7 or 8 to that the blow molding of the main body is biaxial stretch blow molding.

  In the invention of claim 9, the shoulder inner cylinder, the trunk inner cylinder and the bottom can be formed sufficiently thin, and thereby the amount of the resin material consumed for molding one container. Can be reduced.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the first aspect of the invention, since the shoulder portion and the trunk portion have a double wall structure having a gap therebetween, the gap exhibits a heat insulating action and reliably functions as a heat insulating container. .

  Since the upper ends of both wall portions constituting the double wall structure are integrally connected to each other and the mouth tube portion, the outer surface of this portion, that is, the connecting portion between the mouth tube portion and the shoulder portion, is the appearance. A line with a combination surface that may impair the appearance does not appear, and a smooth surface with a good appearance is obtained.

  In the invention according to claim 2, since the relative displacement between the outer cylinder side and the inner cylinder side can be restricted to a small extent, stability during handling can be obtained, and the heat insulating action of the air gap can be obtained. The double container can be made to have the same appearance as that of a normal casing container without causing the lower end edge of the barrel outer cylinder to harm the appearance appearance of the container.

  In the invention according to claim 3, since the lower ends of both wall portions constituting the double wall structure are fixedly bonded and fixed, the mechanical strength of the double wall structure can be increased, thereby stabilizing the container. Since the voids have a sealed structure, the heat insulation effect exhibited by the voids can be sufficiently enhanced.

  In the invention according to claim 4, since the physical properties of the portion for directly storing the contents can be enhanced in a direction advantageous for storage by biaxial stretch blow molding, safe and preferable storage of the contents is achieved. The thickness of the portion that directly stores the contents can be reduced sufficiently without difficulty, so the amount of synthetic resin material required to mold one container can be reduced, Thereby, the resource saving effect can be obtained.

  In the invention according to claim 5, since the bottom portion where no gap exists can be lifted from the floor surface, the space formed between the floor surface and the bottom portion can function as a heat insulating portion, Thereby, the heat insulation effect of the whole container can be enhanced, and even if the portion for directly storing the contents is formed into a thin wall, the seat function does not deteriorate, and a stable seat function is obtained.

  In the invention of claim 6, since the size of the gap can be freely molded, it is possible to set in advance the degree of heat insulation effect to be obtained, and therefore the degree of heat insulation function to be exhibited. , It can be set according to the contents to be stored or the application.

  Further, since the preform is an integrally molded product, its handling is easy, and therefore an efficient molding operation can be obtained.

  In the invention of claim 7, without being disturbed by the curled portion, the blow molding of the main body portion can be achieved without difficulty and without adversely affecting the blow molded portion, The curled portion can be safely heat-molded.

  In the invention according to the eighth aspect, it is possible to safely achieve the sealing of the gap without causing a thermal adverse effect on the blow-molded inner cylinder and the bottom.

  In the invention according to claim 9, the thickness reduction of the shoulder inner cylinder, the trunk inner cylinder and the bottom can be achieved easily and safely.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a semi-longitudinal sectional view showing a first embodiment of a double container 1 according to the present invention. The double container 1 has a thread on the outer peripheral surface and a neck ring 3 below the thread. The projecting tube portion 2, the lower end of the mouth tube portion 2, the shoulder portion 4 continuously provided in a tapered tubular shape whose diameter is expanded downward, and the lower end of the shoulder portion 4 are continuously provided in a suspended manner. It is comprised from the trunk | drum 7, and the bottom part 11 which closes the lower end of this trunk | drum 7. FIG.

  The shoulder 4 has a double wall structure with the shoulder inner cylinder 5 and the shoulder outer cylinder 5 with the gap 12 positioned therebetween. Similarly, the body 7 also has the gap 12 positioned therebetween. The trunk inner cylinder 8 and the trunk outer cylinder 9 form a double wall structure, and the shoulder inner cylinder 5 and the trunk inner cylinder 8 are integrally connected. Similarly, the shoulder outer cylinder 6 and the trunk outer cylinder 9 are connected. Are integrally connected to each other, and therefore, the combined structure portion of the shoulder portion 4 and the body portion 7 has a double wall structure which is integrally continuous.

  The lower end portion of the barrel outer cylinder 9 is curved inwardly, that is, inwardly curved, and is formed into a curled portion 10. The inner peripheral edge of the curled portion 10 is formed at the lower end of the barrel inner cylinder 8. Closely bonded and fixed.

  Due to the tight adhesion of the curled portion 10 to the inner cylinder 8, the gap 12 formed in the combined portion of the shoulder portion 4 and the trunk portion 7 has a hermetically sealed structure, so that air is transferred into the gap 12 by heat convection or the like. The heat insulation ability is prevented from going down and coming out.

  The bottom portion 11 has a central portion recessed in a spherical arc shell shape in the double container 1, and the peripheral end portion functions as a leg portion.

  2 to 4 show an example of the molding method of the embodiment shown in FIG. 1, and the preform 13 shown in FIG. 2 is a mouth having a neck ring 3 in the double container 1 shown in FIG. In the form in which the mouth tube portion 14 is extended downward from the lower end of the mouth tube portion 14 having the neck ring 15 having the same configuration as the tube portion 2, the upper end portion is a shoulder equivalent portion 17 and the center portion is a trunk equivalent portion. 18 and a bottomed cylindrical main body 16 with the lower end portion corresponding to the bottom portion 19 are suspended, and an integral connection portion between the shoulder outer cylinder 6 and the barrel outer cylinder 9 of the double container 1 is configured as it is. The skirt tube portion 20 that is to be suspended is injection-molded.

  The preform 13 is assembled and held on the holding jig 21 and heated to a temperature at which the main body 16 can be stretch-molded, and then assembled to the blow mold apparatus 22 (see FIG. 3).

  The blow mold apparatus 22 includes a split mold 23, a bottom mold 25, a body mold 24, and an extension pin (not shown). The biaxially stretched blow molding apparatus has substantially the same structure, but the body mold 23 is a unique component for molding the gap 12.

  The assembly of the blow mold device 22 to the preform 13 held by the holding jig 21 is performed in such a manner that the neck ring 15 is sandwiched between the preform 13 and the holding jig 21 and the skirt cylinder portion 20 is supported from the outside. The body part mold for forming the molding surface of the in-cylinder cylinder 8 in a posture in which the mold 23 is assembled and the portion that becomes the body outer cylinder 9 of the skirt cylinder part 20 is positioned between the mold 23 and the split mold 23 This is achieved by assembling the mold 24 in combination with the bottom mold 25.

  The body part mold 24 of the illustrated embodiment is a main body that forms a molding die surface of the body inner cylinder 8 in a straight cylindrical shape on a base plate portion having an alignment function part for the split mold 23 and the bottom mold 25. It has a structure in which the parts are integrally provided upright.

  Since the blow mold device 22 has the above-described configuration, the body portion 16 of the preform 13 forms the shoulder outer tube 6 portion of the skirt tube portion 20, the body portion die 23, and the bottom die 25. As the mold surface, secondary stretch blow molding is performed on the shoulder equivalent part 17 on the shoulder inner cylinder 5, the trunk equivalent part 18 on the trunk inner cylinder 8, and the bottom equivalent part 19 on the bottom part 11.

  Thus, since the trunk inner cylinder 8 is formed with the main body portion of the trunk mold 24 inserted in the trunk outer cylinder 9 as a molding die surface, at least the trunk section is formed between the trunk inner cylinder 8 and the trunk outer cylinder 9. The gap 12 is formed with the thickness of the main portion of the mold 24 as the gap width. However, as shown in the illustrated embodiment, the gap 12 is also formed between the shoulder inner cylinder 5 and the shoulder outer cylinder 6. It is desirable to be done.

  The intermediate molded product thus biaxially stretched blow-molded has a structure in which the lower end of the gap 12 is opened as shown in FIG. 4, and therefore, as shown by the arrow in FIG. While curling the lower end of the cylinder 9 into a curled part 10 using a mold, the inner peripheral edge of the curled part 10 is closely and firmly fixed to the lower end of the cylinder 8 with an adhesive. And it shape | molds in the double container 1 shown in FIG.

  FIG. 5 is a semi-longitudinal sectional view showing a second embodiment of the double container 1 according to the present invention. This second embodiment is a curl in which the legs of the double container 1 are curved and formed by post-processing. The structure is formed by the portion 10.

  In the second embodiment shown in FIG. 5, the shoulder inner cylinder 5, the trunk inner cylinder 8, and the bottom 11 are stretched and blow-molded to a sufficiently thin wall, so that the self-shape holding ability is greatly reduced. Even in this state, the curled portion 10 that is curved from the trunk cylinder 9 having the required thickness exhibits a stable leg function.

  Further, the integrally connected object of the shoulder outer cylinder 6 and the trunk outer cylinder 9 covers and protects the thinly connected shoulder inner cylinder 5 and the trunk inner cylinder 8 from the outside. Insufficient strength and difficulty in handling due to the thin connection between the body and the cylinder 8 is not a problem.

  In the above description, the case where the main body portion 16 is biaxially stretched blow-molded has been described as an example. However, the forming means of the main body portion 16 is not limited to the biaxial stretch blow molding, and a normal blower is used. Needless to say, it may be molded.

It is a semi-longitudinal front view which shows the 1st Example of the double container by this invention. It is a vertical front view which shows the preform used for shape | molding the Example of FIG. It is explanatory drawing which shows the biaxial stretch blow molding process of the preform shown in FIG. It is explanatory drawing which shows the structure of the intermediate molded product shape | molded by the biaxial stretch blow molding process shown in FIG. It is a half longitudinal front view which shows the 2nd Example of the double container by this invention.

Explanation of symbols

1; Double container 2; Mouth tube part 3; Neck ring 4; Shoulder part 5; Shoulder inner cylinder 6; Shoulder outer cylinder 7; Body part 8; Body inner cylinder 9: Body outer cylinder 10; Curl part 11; Gap 13; Preform 14; Mouth tube portion 15; Neck ring 16; Body portion 17; Shoulder equivalent portion 18; Body equivalent portion 19; Bottom equivalent portion 20; Skirt cylinder portion 21; Holding jig 22; 23: Split mold 24; Body mold 25; Bottom mold

Claims (9)

  Two synthetic resin blow-molded casings with a cylindrical part (2) connected to the upper end of the body part (7) with the lower end closed by the bottom part (11) via the shoulder part (4). A heavy container (1) having a double wall structure in which the shoulder (4) to the body (7) are integrally connected at the upper end, and at least the body (7) has a gap (12) therebetween. Double container.   The double container according to claim 1, wherein the lower end portion of the outer cylinder (9), which is the outer wall of the trunk portion (7), is a curled portion (10) curved in a direction to close the lower end of the gap (12).   By tightly bonding and fixing the lower end of the trunk outer tube (9) to the portion from the trunk inner tube (8) which is the inner wall of the trunk portion (7) to the peripheral end of the bottom portion (11), the gap ( The double container according to claim 1 or 2, wherein 12) has a sealed structure.   Biaxially stretching the part consisting of the shoulder inner cylinder (5) which is the inner wall of the shoulder (4), the trunk inner cylinder (8) which is the inner wall of the trunk (7), and the bottom (11) The double container according to claim 1, 2 or 3, which is a blow molded part.   The double container according to claim 1, 2, 3 or 4, wherein the curled portion (10) forms a leg portion.   At the upper end of the trunk (7) whose lower end is closed with the bottom (11), the mouth tube (2) is connected via the shoulder (4), and the shoulder (4) and the trunk (7) are connected. A method for forming a double container (1) made of a synthetic resin that is blow-molded into a housing shape with a double wall structure, from the lower end of the mouth tube part (14), to the shoulder equivalent part (17) and the trunk A bottomed cylindrical main body (16) composed of an equivalent part (18) and a bottom equivalent part (19), and a shoulder outer cylinder (6) and a trunk outer cylinder (9) of the double container (1). The preform (13) is formed in a hanging manner with the skirt tube portion (20) to be formed, and the body portion (16) of the preform (13) is at least externally connected to the skirt tube portion (20). A method of forming a double container, which is blow-molded to a size that forms a gap (12) between the cylinder (9).   The double container according to claim 6, wherein a lower end portion of the outer cylinder (9) of the skirt tube portion (20) is heated and formed into a curled portion (10) by curving in a direction closing the lower end of the gap (12). Molding method.   The lower end of the outer cylinder (9) is tightly bonded and fixed with an adhesive to a portion of the body (7) from the blow-molded inner cylinder (8) to the peripheral end of the bottom (11). 8. A method for forming a double container according to 6 or 7.   The method for molding a double container according to claim 6, 7 or 8, wherein the blow molding of the main body (16) is biaxial stretch blow molding.

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