JP4251352B2 - Double container and molding method - Google Patents

Description

  The present invention relates to a blow molded casing-shaped synthetic resin double container exhibiting 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 structure 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 in 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 and connected to the upper half of the outer container body so that it covers the inner half of the outer container body. 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.

  Moreover, since the double container is completed by connecting the upper and lower outer container bodies, the joint portion of the outer container bodies is highly likely to deteriorate the external appearance of the container. There is a problem that it is necessary to conceal the mating portion, and accordingly, the configuration is complicated 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 is:
The upper end of the closed's torso and lower at the bottom it is a double container made of a synthetic resin which is formed form the bottle-shaped and continuously provided a mouth tube portion via a shoulder portion,
Having at least the body part as a double wall structure having a gap between them and integrally connecting the upper ends;
The inner peripheral edge of the inwardly curled curl portion, which is the lower end portion of the blow-molded barrel outer cylinder constituting the outer wall of the trunk portion, constitutes the inner wall of the barrel portion, and the trunk outer cylinder (9 ) And the inner cylinder that was blow-molded together with the bottom end of the cylinder to the bottom end of the cylinder.
It is in.

In the first aspect of the present invention, since at least the body portion has a double wall structure with a gap therebetween, the gap exhibits a heat insulation function, and the double container functions as a heat insulation container. is, since the double-walled structure portion is blow molded together, Ru molding facilitates der to the bottle shape.

  Since the formed gap has a sealed structure, there is no possibility that the heat insulation action is lowered due to the entry / exit of air to / from the gap due to the action of heat convection and the like, and thus the excellent heat insulation effect is stably exhibited.

  Since the upper ends of the double wall structure part are integrally connected to each other and to the mouth tube part, there is a risk of deteriorating the appearance of this part, that is, the part from the shoulder part to the trunk part. A line due to the combination surface does not appear, and a smooth outer surface is formed.

  In addition, the inner peripheral end of the curled portion that is tightly bonded and fixed to the portion from the lower end portion of the barrel inner cylinder to the peripheral end portion of the bottom portion is positioned on the lower surface side of the double container formed almost without exception. Therefore, when the double container is placed upright, the double container is hidden and cannot be visually observed. Therefore, the adhesive fixing portion does not adversely affect the appearance of the double container.

  The invention described in claim 2 is obtained by adding the structure of the invention described in claim 1 to the double wall structure from the shoulder portion to the body portion.

  In the invention according to the second aspect, since the gap can be positioned in almost the entire region of the shoulder portion and the trunk portion, the heat insulating action can be exerted in almost the entire region of the shoulder portion and the trunk portion. Therefore, a greater heat insulating effect is exhibited as a container.

  The invention described in claim 3 is obtained by adding a leg portion to the curl portion to the configuration of the invention described in claim 1 or 2.

  In the invention according to the third aspect, the bottom portion that does not have the double wall structure can be lifted from the floor surface, and accordingly, a heat insulating effect on the bottom portion can be obtained.

In the present invention, the means of the invention according to claim 4 is:
The upper end of the closed's torso and lower at the bottom, a mouth tube portion consecutively provided through a shoulder, is formed form at least the body portion, and a double wall structure having an air gap between, the bottle-shaped It is a method of molding a double container made of synthetic resin,
From the lower end of the mouth tube portion, it has a bottomed cylindrical main body portion consisting of a shoulder equivalent portion, a trunk inner cylinder equivalent portion and a bottom equivalent portion, and at least a barrel outer cylinder equivalent portion, with a gap in between the main body portion Forming a preform that is formed by surrounding and forming a cylindrical skirt tube portion in a hanging manner;
The preform is heat-formed into a curled portion with the lower end portion of the skirt tube portion bent inward, and the inner peripheral edge of the curled portion is equivalent to the bottom from the lower end portion of the body cylinder corresponding to the main body portion. Blow molding into a double container after closely adhering and fixing to the part over the peripheral edge of the part,
It is in.

  In the invention according to claim 4, since the gap formed between the main body portion and the skirt tube portion has a sealed structure, the preform can be used using an existing mold device, It can be blow molded into a double container using existing molding procedures.

  The adhesive fixing part between the curl part and the main body part is subjected to the blow molding process like the other main body parts and the skirt tube part, so that the outer surface part is pressed against the mold surface and molded smoothly. There is no inconvenience that the adhesive fixing trace remains stepwise or linearly and adversely affects the appearance.

  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 described in claim 5 is obtained by adding the configuration of the invention described in claim 4 to that the blow molding is a biaxial stretch blow molding.

  In the invention according to claim 5, it becomes possible to impart to the double container to be molded the improvement of physical properties accompanying the biaxial stretch blow molding, whereby the contents storage characteristics of the double container and the machine An improvement in mechanical strength can be obtained.

  The invention described in claim 6 is obtained by adding, to the configuration of the invention described in claim 4 or 5, a close adhesive fixing of the curled portion to the main body portion with an adhesive.

  In the sixth aspect of the present invention, dense and strong adhesion can be reliably achieved without giving any thermal influence to the portion of the main body portion to which the curled portion is closely adhered and fixed.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the invention according to claim 1, since at least the trunk portion has a double wall structure having a gap therebetween, the gap exhibits a heat insulating action and reliably functions as a heat insulating container. Moreover, since it is a blow molded product, it can be easily molded into a casing.

  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 from this portion, that is, from the shoulder portion to the trunk portion, may damage the appearance. A line by a certain combination surface does not appear, and a smooth surface having a good appearance is obtained.

  The inner peripheral edge of the curled portion that is closely bonded and fixed to the main body portion is hidden by the body portion when the molded double container is placed upright, so this portion is the appearance of the double container. There is no fear of harm.

  In the invention according to the second aspect, since the heat insulating effect can be exerted on almost the entire region of the shoulder portion and the trunk portion, a larger heat insulating effect can be exhibited.

  In the invention according to the third aspect, since the heat insulating action can be obtained for the bottom portion which does not have the double wall structure, the heat insulating effect as a whole container can be remarkably enhanced.

  In the invention of claim 4, since the preform can be blow-molded into a double container by an existing molding procedure using an existing mold apparatus, the molding is easy, It will be cheap and safe.

  Since the adhesive fixing part between the curl part and the main body part is also subjected to the blow molding process, the outer surface part is molded smoothly, and the appearance does not adversely affect the appearance of the container at all. .

  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 described in claim 5, the double container can be provided with improved physical properties accompanying biaxial stretch blow molding, whereby a strong and safe double container can be obtained.

  In the invention according to the sixth aspect, it is possible to safely and easily and surely achieve the close adhesive fixing between the curl portion and the main body portion.

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 10 which closes the lower end of this trunk | drum 7. FIG.

  The shoulder 4 has a single wall structure, but the body 7 has a double wall made up of a body inner cylinder 8 and a body outer cylinder 9 with a gap 11 positioned between them and an upper end integrally connected to the shoulder 4. It has a structure.

  The gap 11 formed in the trunk portion 7 is the lower end portion of the outer cylinder 9, and the inner peripheral edge of the curled portion 22 that is curved inwardly adheres closely to the lower end portion of the barrel inner cylinder 8. By being fixed, it has a sealed structure.

  Thus, since the space | gap 11 has a sealed structure, heat insulation capability does not fall by heat convection etc., and the constant heat insulation effect will be exhibited stably.

  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 12 shown in FIG. 2 has a mouth having a neck ring 3 in the double container 1 shown in FIG. The mouth tube portion 13 is extended downward from the lower end of the mouth tube portion 13 having the neck ring 14 having the same configuration as that of the tube portion 2, with the upper end portion corresponding to the shoulder 16 and the center portion being the in-cylinder tube. The bottomed cylindrical main body 15 having the corresponding portion 17 and the lower end portion corresponding to the bottom corresponding portion 18 is suspended, and the main body portion 15 is interposed from the lower end portion of the shoulder corresponding portion 16 of the main body portion 15. The cylindrical skirt tube portion 19 composed of the outer cylinder corresponding portion 21 that surrounds and forms the space 11 is injection-molded.

  In this preform 12, the lower end portion of the skirt tube portion 19 is bent inward to be formed into a curled portion 22, and the inner peripheral edge of the curled portion 22 is formed into the body cylinder corresponding portion 17 of the main body portion 15. After being molded into a structure (see FIG. 3) that is closely bonded and fixed to the lower end portion of the adhesive, it is heated and molded into the double container 1 while being attached to the holding jig 23.

  The blow mold apparatus 24 (see FIG. 4) is composed of a split mold 25, a bottom mold 26, and a stretching pin (not shown), and has the same structure as a normal biaxial stretch blow molding apparatus. The preform 12 is biaxially stretch blow molded into the double container 1 by the same procedure as the conventional procedure.

  When the biaxially stretched blow molding from the preform 12 to the double container 1 is performed, the gap 11 has a hermetically sealed structure, so that the gap state is stably maintained without being crushed by the blow pressure. Ensure a heavy structure.

  FIG. 5 is a semi-longitudinal sectional view showing a second embodiment of the double container 1 according to the present invention. In the second embodiment, the shoulder portion 4 also has a body portion 7 with a gap 11 therebetween. This is constructed in a double wall structure comprising a shoulder inner tube 5 integrally connected to the body inner tube 8 and a shoulder outer tube 6 integrally connected to the body outer tube 9.

  In this second embodiment, the air gap 11 extends not only to the body part 7 but also to the shoulder part 4, so that it exhibits a heat insulating function over substantially the entire region from the shoulder part 4 to the body part 7. It can be done, and it shows a high heat insulation effect.

  As shown in FIG. 6, the preform 12 for molding the second embodiment is obtained by integrally connecting the skirt tube portion 19 from the upper end of the shoulder equivalent portion 16 of the main body portion 15. The shoulder outer cylinder equivalent part 20 is formed in the upper part, and the shoulder equivalent part 16 of the main body part 15 is formed in the shoulder inner cylinder 5.

  FIG. 7 is a semi-longitudinal sectional view showing a third embodiment of the double container 1 according to the present invention. This third embodiment has a configuration in which the legs of the double container 1 are formed by curled portions 22. It has become.

  In the third embodiment shown in FIG. 7, a gap 11 or a space is necessarily located between the placement surface of the double container 1 and the stored contents. 11 or space effectively blocks the heat influence from the placement surface on the contents.

  As shown in FIG. 8, the preform 12 for molding the third embodiment has an inner peripheral edge of the curled portion 22 of the skirt tube portion 19 close to the center portion of the bottom equivalent portion 18 of the main body portion 15. A part of the curled part 22 constitutes a part of the bottom part 10.

  In the above description, the forming of the preform 12 into the double container 1 has been described by biaxial stretch blow molding, but the present invention is not limited to this, and simple blow molding can be used. It is.

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. FIG. 3 is a longitudinal front view in which a curl portion is processed on the preform shown in FIG. 2. It is explanatory drawing which shows the biaxial stretch blow molding process of the preform shown in FIG. It is a half longitudinal front view which shows the 2nd Example of the double container by this invention. It is a longitudinal front view which shows the preform used for shape | molding the Example of FIG. It is a half longitudinal front view which shows the 3rd Example of the double container by this invention. It is a longitudinal front view which processed the curl part into the preform used for shape | molding the Example of FIG.

Explanation of symbols

1; Double container 2; Mouth tube portion 3; Neck ring 4; Shoulder portion 5; Shoulder inner tube 6; Shoulder outer tube 7; Torso portion 8: Trunk inner tube 9; Neck ring 15; Body part 16; Shoulder equivalent part 17; In-cylinder equivalent part 18; Bottom equivalent part 19; Skirt cylinder part 20; Shoulder outer cylinder equivalent part 21; Part 22; curl part 23; holding jig 24; blow mold device 25: split mold 26; bottom mold

Claims (6)

Closed's torso at the bottom of the lower end (10) to the upper end (7), the shoulder (4) the mouth tube portion through the (2) continuously provided to bottle body shape forming form synthetic resin of the secondary It is a heavy container (1), and at least the body (7) has a double wall structure with a gap (11) in between and the upper ends connected together, and the outer wall of the body (7) is The inner peripheral edge of the inwardly curled curl portion (22), which is the lower end portion of the blow-molded barrel outer cylinder (9), constitutes the inner wall of the barrel portion (7), and the barrel The gap (11) is hermetically sealed by tightly bonding and fixing a portion from the lower end portion of the inner cylinder (8) blown together with the outer tube (9) to the peripheral end portion of the bottom portion (10). Double container.   The double container according to claim 1, wherein the shoulder (4) to the trunk (7) have a double wall structure.   The double container according to claim 1 or 2, wherein the curled portion (22) forms a leg portion. At the upper end of the body part (7) whose lower end is closed by the bottom part (10), the mouth tube part (2) is connected via the shoulder part (4), and at least the body part (7) is interposed between the gaps ( 11) and a double wall structure having a molding process of synthetic resin double container which is formed form the bottle-shaped (1), from the lower end of the mouth tube section (14), a shoulder portion corresponding ( 16) a body portion (15) having a bottomed cylindrical shape composed of an inner cylinder equivalent portion (17) and a bottom equivalent portion (18), and at least an outer cylinder equivalent portion (21). 15) is formed by forming a preform (12) in a hanging manner with a cylindrical skirt tube portion (19) surrounding and forming a gap (11) therebetween, and the preform (12) The lower end portion of the skirt tube portion (19) is bent inward to be heat-formed into a curled portion (22), and the inner peripheral edge of the curled portion (22) is connected to the main body portion ( 5) A double container that is blow-molded into a double container (1) after being closely adhered and fixed to a portion from the lower end of the cylinder inner equivalent part (17) to the peripheral end of the bottom equivalent part (18). Molding method.   The method for forming a double container according to claim 4, wherein the blow molding is biaxial stretch blow molding.   The method for forming a double container according to claim 4 or 5, wherein the adhesion of the curled portion (22) to the main body portion (15) is achieved with an adhesive.

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