JPH0212820B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a multilayer laminate in which the container body is composed of a multilayer laminate of a relatively thick paper layer and a thermoplastic synthetic resin layer, and the neck part is a multilayer laminate that constitutes the container body. This relates to a composite container body that is integrally constructed with a thermoplastic synthetic resin layer, which is one of the layers in the container body, and its manufacturing method. It not only provides sufficient rigidity and strength to the container body, but also provides light shielding performance for the contents inside the container body. A composite container body that has a high bonding strength between a paper layer and a thermoplastic synthetic resin layer and also has a resealing function with a separate lid that is secured to the mouth and neck; Moreover, it provides a method for easily obtaining it.

Container bodies for filling liquids, mainly liquid beverages such as milk and fruit juice, are made of hollow container bodies made of thermoplastic synthetic resin injection molding or extrusion blow molding, or multi-layered thermoplastic synthetic resin films/aluminum foils/paperboards, etc. Laminated sheets can be made into paper containers with a cable top type (roof type) or block type (box type), or even bag-like bodies made of multilayer laminated sheets such as thermoplastic synthetic resin film or aluminum foil. A composite product in which the container neck, which is an injection molded product, is joined by heat sealing or the like, and this is further assembled and held inside a separately manufactured box such that the container neck extends from the box. There is a container body, etc. However, the first hollow container body made of thermoplastic synthetic resin can be provided with resealing performance by having a neck portion to which a separate cap can be locked. In order to maintain the required strength for liquid filling containers, the wall thickness of the container body must be increased to a certain level, which makes disposal of used container bodies difficult. Another disadvantage is that the second paper container does not have a sealing function by resealing once it has been opened.
Furthermore, due to its structure, the third composite container main body has many heat-sealed and bonded parts, so it is susceptible to impacts such as shocks applied when containers filled with liquid are dropped during handling operations during the distribution process. As a result, heat-sealed parts, such as the bonded parts of the body and bottom of a bag-like body made of a multilayer laminated sheet, and the joint between the container neck and the bag-like body, are likely to tear, and there is a high risk of liquid leakage. It has its drawbacks.

In contrast, the first invention provides a composite container body comprising an outer case made of cardboard and a container made of thermoplastic synthetic resin having fin pieces protruding from the outer peripheral surface below the mouth and neck. , the outer case made of cardboard is
The container is composed of a container bottom wall, a container peripheral wall rising from the periphery of the container bottom wall, and a shoulder wall continuous to the top edge of the container peripheral wall, and is made of thermoplastic synthetic resin. The container body consists of a container bottom wall, a container peripheral wall rising from the periphery of the container bottom wall, and a shoulder wall extending from the container peripheral wall to the mouth and neck, and the container trunk It consists of a mouth and neck part that is continuous with the shoulder wall part and to which a separately manufactured lid body is locked, and a fin piece that projects from the outer peripheral surface below the mouth and neck part. In the composite container main body, the container made of thermoplastic synthetic resin is placed inside the outer case made of cardboard, and the outer periphery of the container trunk of the container made of thermoplastic synthetic resin is also arranged on the inner peripheral wall surface of the outer case. Only the thermoplastic material in the thermoplastic synthetic resin container is extended to the outside of the outer case through an opening that is bored in the approximate center of the shoulder wall of the outer case so that the wall surfaces are in contact with each other. The outer case and the thermoplastic synthetic resin container are arranged so that at least the back surface of the fin piece that protrudes from the outer peripheral surface below the mouth and neck of the thermoplastic synthetic resin container and the surface of the shoulder wall of the outer case, and between the surface of the shoulder wall of a thermoplastic synthetic resin container and the back surface of the shoulder wall of the outer case. In the shoulder wall portion of the composite container main body, a container made of thermoplastic synthetic resin is integrally fused and adhered to both the inner and outer wall surfaces of the outer case.

In addition, the second invention comprises a container bottom wall, a container peripheral wall rising from the peripheral edge of the container bottom wall, and a shoulder wall continuous to the upper edge of the container bottom wall. Approximately in the center of the wall is a cardboard outer case with an opening large enough to allow a separate parison made of thermoplastic synthetic resin to be set therein. A parison made of thermoplastic synthetic resin having a bottomed cylindrical shape and having a container neck at the top and a fin protruding from the outer circumferential surface below the neck. is loaded into the outer case so that the container neck of the parison extends from the opening in the outer case, and the fin pieces are placed on the shoulder wall of the outer case. By blowing pressurized air into the parison and performing blow molding or biaxial stretching blow molding of the thermoplastic synthetic resin parison, at least the outer circumferential surface of the lower mouth and neck of the thermoplastic synthetic resin container is The back surface of the fin piece protruding from the fin and the surface of the shoulder wall of the outer case are also
This process consists of obtaining a composite container body in which the surface of the shoulder wall of the thermoplastic synthetic resin container and the back surface of the shoulder wall of the outer casing are respectively fused and adhered.

Hereinafter, the structure of the composite container main body of the present invention will be explained based on the drawings.

FIG. 1 shows an example of a composite container main body of the present invention. The composite container main body 1 includes an outer case 2 made of cardboard and a container made of thermoplastic synthetic resin housed inside the outer case 2. It is composed of 3.

The outer case 2 includes a container bottom wall portion 4, a container bottom wall portion 5 rising from the periphery of the bottom wall portion, and a container peripheral wall portion 5.
The shoulder wall part 6 is continuous with the shoulder wall part 6, and the shoulder wall part 6 has an opening O for opening and neck extension perforated in the approximate center thereof, and is made into a cylindrical case by a cartoning machine using cardboard for box making. Of course, a box made of cardboard coated with a thermoplastic synthetic resin or the like may also be used.

The container 3 made of thermoplastic synthetic resin has a container bottom wall portion 7.
, a container body 11 having a container bottom wall 8 rising from the periphery of the container bottom wall, and a shoulder wall 10 transitioning from the container bottom wall 8 to the mouth and neck portion 9; It is composed of the mouth and neck part 9, which is continuous with the mouth and neck part 9 and to which a separately manufactured lid body is locked, and the fin piece 14 that is protruded from the lower outer circumferential surface of the mouth and neck part. It is made of thermoplastic synthetic resin such as polypropylene, polyethylene terephthalate, polyvinyl chloride, and ionomer resin.

In the composite container main body 1, the container 3 made of thermoplastic synthetic resin is placed inside the outer case 2 made of cardboard, and the outer periphery of the container 3 made of thermoplastic synthetic resin is mounted on the inner peripheral wall surface of the outer case 2. The mouth and neck part 9 of the container 3 extends to the outside of the outer case 2 from the outer peripheral part O, which is bored in the approximate center of the shoulder wall part 6 of the outer case 2, so that the wall surfaces are in contact with each other. A shoulder wall 6 of the case 2 is interposed between the fin piece 14 and the shoulder wall 10 of the container 3, and the outer case 2 and the outer case 2 are made of thermoplastic synthetic resin. The container 3 is made of at least the back surface of the fin piece 14 protruding from the outer peripheral surface below the mouth and neck part 9 of the container 3 made of thermoplastic synthetic resin, and the surface of the shoulder wall part 6 of the outer case 2. In addition, the container 3
The surface of the shoulder wall 10 and the shoulder wall 6 of the outer case 2 in
By each fusion and adhesion between the back side of
That is, in the shoulder wall 12 of the composite container body 1 surrounding the opening O in the outer case 2, the fin piece 14 of the container 3 made of thermoplastic synthetic resin and the shoulder wall 10
and the shoulder wall portion 6 of the outer case 2 are fused and bonded together.

Note that the protrusion 13 on the mouth and neck part 9 is a spiral protrusion that indicates a locking mechanism between the mouth and neck part 9 and a separate lid that is locked to the mouth and neck part 9. Any other locking mechanism may be used, such as by an undercut.

Further, as described above, the outer case 2 and the thermoplastic synthetic resin container 3 in the composite container main body 1 are connected to the fin piece 14 and the shoulder wall of the outer case 2 in the shoulder wall 12 of the composite container main body 1. 6 and shoulder wall portion 10 of container 3
It is sufficient that the inner circumferential wall surface of the outer case 2 and the outer circumferential wall surface of the container body 5 of the thermoplastic synthetic resin container 3 are fused and bonded over the entire surface. Of course, it can also be glued.

The method for manufacturing a composite container main body of the present invention provides a bottomed cylindrical shape made of thermoplastic synthetic resin, the upper part of which is a container mouth neck, and a fin piece protruding from the outer peripheral surface of the lower part of the mouth neck. For example, a parison made of a thermoplastic synthetic resin made of a bottomed cylindrical injection molded body as shown by reference numeral 15 in FIG. This is done by using a separate outer box made of pre-processed cardboard or the like.

That is, as shown in FIG. 3, a container bottom wall portion 17 and a container bottom wall portion 18 rising from the periphery of the container bottom wall portion 17 are placed in a mold 16 for blow molding or biaxial stretch blow molding. and a shoulder wall portion 19 continuous to the upper edge of the container peripheral wall portion, and approximately in the center of the shoulder wall portion 19 is an opening O large enough to allow a separately manufactured parison made of thermoplastic synthetic resin to be set therein. A perforated outer case 20 made of cardboard is set, and then a parison made of thermoplastic synthetic resin heated to a temperature suitable for blow molding or biaxial stretch blow molding is placed inside the outer case. The mouth and neck part 21 extends from the opening O' of the outer case 20, and the parison is inserted so that the fin piece rests on the shoulder wall of the outer case 20, and further the mouth and neck part 2 of the parison is inserted.
1 is held by the mouth and neck part 21 and the holder 22, and the parison is loaded into the outer case 20 in the above state.

After that, pressurized air is blown into the parison from the opening formed by the mouth and neck part 21 of the parison made of thermoplastic synthetic resin, and the parison made of thermoplastic synthetic resin is blow molded or biaxially stretched blow molded. A composite container main body consisting of the above-mentioned outer case 20 and a thermoplastic synthetic resin container 23 which is a blow-molded or biaxially stretched parison, in which the outer case 20 and the thermoplastic synthetic resin container 23 are
At least in the shoulder wall of the composite container main body, that is, around the outside of the opening O' in the outer case 20, the fin pieces of the container 23, the shoulder wall of the outer case 20, and the shoulder wall of the container 23 are connected. A composite container main body having a structure in which three parts are fused and bonded together is obtained.

The embodiment shown in FIG. 3 mainly uses a parison made of thermoplastic polyester. A stretching rod 24 is inserted into the opening of the parison, and the stretching rod 24 is pushed down to open the parison. At the same time as the parison is stretched in the longitudinal direction, pressurized air is blown from the air blowing tube 25 inserted into the stretching rod 24 to stretch the parison in the transverse direction, and the thermoplastic synthetic resin container 23 is formed by biaxial stretch blow molding. This figure shows the biaxial stretch blow molding obtained. In particular, when the thermoplastic synthetic resin container 23 is obtained by biaxial stretch blow molding, the biaxial stretch blow molding is performed at a temperature below the melting point of the synthetic resin constituting the thermoplastic synthetic resin parison. The obtained container 23 made of thermoplastic synthetic resin is
Since the neck part 21 of the parison is fused and adhered to the outer case 20 at the shoulder wall near the lower end, the parison mouth neck part 21 holder 22 is required during blow molding or biaxial stretch blow molding to obtain the container 23. It is preferable to heat accordingly to completely fuse and adhere the container 23 and the outer case 20.

In addition, the inner circumferential wall surface of the cardboard outer case constituting the composite container body and the outer circumferential wall surface of the container body of the thermoplastic synthetic resin container cover the entire surface of the outer case and the thermoplastic synthetic resin container. The composite container body, which is fused and adhered to the container, is an outer box made of cardboard coated with a thermoplastic synthetic resin having a low melting point, with the coated surface facing inside. It can be obtained by blow molding a parison made of a polyolefin resin using a body, or by blow molding a parison made of a thermoplastic synthetic resin with a low melting point at a temperature higher than the melting point.

Generally, in order to make the shape of the inner peripheral surface of the outer case made of cardboard approximately match the shape of the outer peripheral surface of the container made of thermoplastic synthetic resin, a pinhole-like air hole with a diameter of about 1 mm is installed in the outer case. It is preferable to provide one.
In this case, a through hole for the air passing from the outer case should also be provided in the mold of the part that comes into contact with the pinhole-like air hole formed in the outer case. It is necessary to provide the hole and the through hole so that they communicate with each other.

The composite container main body and the manufacturing method thereof of the present invention are constructed as described above, and the composite container main body has sufficient rigidity required for a liquid filling container main body by the outer case made of cardboard. In addition to strength and light-shielding properties against the contents, the thermoplastic synthetic resin container contained within the outer case provides the airtightness required for liquid-filling container bodies. The opening and neck part, which is equipped with a lid and which is secured with a separate lid, is composed of the mouth and neck part of the thermoplastic synthetic resin container that is housed inside the cardboard outer case. There is no liquid leakage between the mouth and neck and the shoulder of the container body, and excellent resealing performance is achieved.Furthermore, the shoulder wall of the composite container body that surrounds the opening is made of thermoplastic synthetic material. Since the fin pieces of the resin container, the shoulder wall of the outer case, and the shoulder wall of the container are fused and glued together, the outer case and the container made of thermoplastic synthetic resin can be bonded together. This provides functions and effects such as strong bonding between the parts.

In addition, the composite container body of the present invention has an outer case made of cardboard, which has better flammability than a hollow container body molded only from synthetic resin, so it can be easily disposed of after use. It has certain functions and effects.

Furthermore, the method for manufacturing a composite container main body of the present invention is characterized in that thermoplastic Since the parison made of synthetic resin is biaxially stretched blow molded or blow molded, there is no complicated process such as bonding process required for manufacturing this type of container body, and the present invention can be carried out reliably and easily. This has the effect of making it possible to obtain a composite container body.

[Brief explanation of drawings]

Fig. 1 shows a longitudinal section of a composite container main body as an example of the present invention, and Fig. 2 shows an example of a parison made of thermoplastic synthetic resin used for manufacturing the composite container main body of the present invention. Front view partially in section, 3rd
The figure is a longitudinal sectional view showing one example of the final step of the method for manufacturing a composite container body of the present invention. 1: Composite container body, 2: Cardboard outer case, 3:
Container made of thermoplastic synthetic resin, 6: Shoulder wall of outer casing 2, 9: Mouth and neck, 10: Shoulder wall of container 3,
12: Shoulder wall of the composite container main body 1, 14: Fin piece protruding from the outer circumferential surface below the mouth and neck 9 of the container 3, O: Opening for extension of the mouth and neck 9, 15: Thermoplastic composition Parison molded into a resin container, 1
6: Mold for blow molding or biaxial stretch blow molding.

Claims (1)

[Scope of Claims] 1. A container made of cardboard comprising a container bottom wall, a container peripheral wall rising from the periphery of the container bottom wall, and a shoulder wall continuous to the top edge of the container peripheral wall. In the outer case, there is provided a container body which is comprised of a container bottom wall, a container peripheral wall rising from the periphery of the container bottom wall, and a shoulder wall transitioning from the container peripheral wall to the mouth and neck. and a mouth and neck part that is continuous with the shoulder wall part of the container body part and has fin pieces protruding from the lower outer peripheral surface of the mouth and neck part. Similarly, the thermoplastic synthetic resin container is made of thermoplastic synthetic resin from an opening that is bored in the approximate center of the shoulder wall of the outer case so that the outer circumferential wall surface of the container trunk of the thermoplastic synthetic resin container is in contact with the thermoplastic synthetic resin container. The container is filled with only the mouth and neck extending outside the outer case, and the outer case and the thermoplastic synthetic resin container are at least connected to the mouth and neck of the thermoplastic synthetic resin container. The back surface of the fin piece protruding from the outer peripheral surface below the neck and the surface of the shoulder wall of the outer case, and the surface of the shoulder wall of a case made of thermoplastic synthetic resin and the shoulder wall of the outer case. At the shoulder wall of the composite container body, the thermoplastic synthetic resin body is integrally fused and adhered to both the inner and outer walls of the outer case. A composite container body characterized by: 2. The composite container body according to claim 1, wherein the thermoplastic synthetic resin container is a blow molded product of polyolefin synthetic resin. 3. The composite container body according to claim 1, wherein the thermoplastic synthetic resin container is a biaxially stretched blow-molded body of polyester synthetic resin. 4. The composite container body according to claim 3, wherein the thermoplastic synthetic resin container is a biaxially stretched blow-molded product of polyethylene terephthalate. 5 Consists of a container bottom wall, a container peripheral wall rising from the periphery of the container bottom wall, and a shoulder wall continuous to the upper edge of the container peripheral wall, and approximately at the center of the shoulder wall, An outer box made of cardboard, which has an opening large enough to accommodate a separate parison made of thermoplastic synthetic resin, is set in a mold for blow molding or biaxially stretched blow molding, and then, A parison made of a thermoplastic synthetic resin and having a bottomed cylindrical shape, the upper part of which is the container neck, and a fin protruding from the outer peripheral surface below the mouth neck, is placed inside the outer case. The container neck of the parison extends from the opening in the outer case, and the fin pieces are placed on the shoulder wall of the outer case, and then the container is loaded into the parison. By blowing pressurized air and performing blow molding or biaxial stretching blow molding of a thermoplastic synthetic resin parison, at least the fin pieces protruding from the outer peripheral surface of the thermoplastic synthetic resin container below the mouth and neck. The back surface of the container is fused and adhered to the surface of the shoulder wall of the outer case, and the surface of the shoulder wall of the thermoplastic synthetic resin container and the back surface of the shoulder wall of the outer case are respectively fused and adhered. A method for manufacturing a composite container body, the method comprising obtaining a composite container body.