JP2006240629A - Synthetic resin container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin container which is coated closely with a synthetic resin film layer at least on the outer surface of the trunk of the container to show no deterioration of the appearance during use, offer unique decorativeness never seen before, and exert a sufficient gas barrier function, etc. provided by the film layer. <P>SOLUTION: A container body 2 is made of a synthetic resin selected from a polyolefin resin, a polystyrene resin, a polyester resin, a polyvinyl chloride resin, and a polyamide resin. The container body 2 is manufactured by subjecting a preform to an stretch blow molding process. At least a part of the outer surface of the trunk 4 of the container body 2 is coated with the synthetic resin film layer 11 that is formed by stretching the film layer 11 along with the preform when the preform is subjected to the stretch blow molding process. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin container whose outer surface is covered with a synthetic resin film in a close contact state.

  Stretch blow molded products made of resins such as polyethylene, polypropylene, polystyrene, polyester, polyvinyl chloride, and polyamide are used in a wide range of fields as containers for casings due to their strengths such as toughness, rigidity, transparency, and lightness. ing.

In addition, containers that have been stretch blow molded are widely used for decoration purposes, in which a label printed with a trade name, a pattern, or the like is attached to the body, or the body is covered with a shrink film. For example, Patent Document 1 describes a so-called in-mold label that is applied in-mold at the time of stretch blow molding in order to impart decorativeness.
JP 2004-136486 A

  However, in order to improve the pressure resistance and strength of the container, it is necessary to form various uneven shapes on the body part or to provide a protruding object for attaching a handle function part or the like or for a decorative purpose. Even if a mold label is used, it is difficult to apply a label along the shape of large irregularities, and the label can be applied only to a certain region.

  In addition, although the shrink film can cover over unevenness, the film end may be lifted, a gap may be formed between the outer surface of the housing, and wrinkles may be generated due to the looseness of the film, which may impair the appearance.

  The present invention was devised to solve the above-described problems in the prior art, and a synthetic resin container in which the outer surface of the trunk portion is covered with a synthetic resin film layer in a close contact manner regardless of the shape of the container. As a technical problem to be obtained, there is provided a container that does not deteriorate in appearance during use and has a unique decorative property that has never been seen before, or a film layer that fully exhibits functions such as gas barrier properties. Objective.

Among the present invention for solving the technical problem, the means of the invention according to claim 1
At least one outer surface of the body part of a container body made of a synthetic resin selected from polyolefin resin, polystyrene resin, polyester resin, polyvinyl chloride resin, and polyamide resin, formed by stretch blow molding a preform. The portion is covered with a synthetic resin film layer formed by stretching integrally with the preform when the preform is stretch-blown.

  Polyolefin resin, polystyrene resin, polyester resin, polyvinyl chloride resin, and polyamide resin are resins suitable for biaxial stretch blow molding. Since the synthetic resin film layer formed by stretching together with the preform covers the container body, the covering range is not limited by protrusions such as the concavo-convex structure of the container body and the handle function part. It is possible to provide a synthetic resin container that is free from slack, gaps, spots, etc., and has a film layer coated in close contact with the shape of the bag body.

  By making the film layer have a decorative property by printing, etc., or a structure having gas barrier properties, impact resistance, light shielding properties, ultraviolet absorption, etc., decorative properties and various functions can be easily and effectively Can be applied to the container.

  Here, as the polyolefin resin in the present invention, for example, a resin such as polyethylene (PE), polypropylene (PP), and cyclic polyolefin can be used. As the polystyrene resin, for example, polystyrene, stereoregular polystyrene, high impact polystyrene, Resins such as AS and ABS can be used.

As the polyester resin, for example, a resin such as polyethylene terephthalate (PET) or polyethylene naphthalate can be used. As the polyamide resin, for example, a resin such as nylon 6, nylon 66, or a xylylene group-containing polyamide is used. can do.
Of course, it is also possible to use a resin blended with a copolymer, a blend, and a filler mainly composed of the above resin components.
The container body may have a laminated structure in which these resins are the main components and other resins are laminated on the intermediate layer.

  In addition, since the film layer is formed by being stretched integrally with the preform when the preform is stretch-blown, it can be bonded to the preform by thermocompression bonding, and in the stretch-blow molding temperature region of the preform. A synthetic resin having good stretchability is selected.

  The means of the invention described in claim 2 is that, in the invention described in claim 1, it is covered with a film layer over the entire circumference and substantially the entire height of the outer surface of the body portion of the container body.

  According to the above-described configuration of the second aspect, since the covering is performed over substantially the entire region of the body portion of the container body, the decorating property can be exhibited over substantially the entire body portion, and the film layer is a resin having a high gas barrier property. If formed by this, a high container made of a gas barrier can be provided.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a preform in which a film that can be co-stretched in advance is bonded to the trunk portion in an in-mold is used. The film is stretched together with the reform to form a film layer.

The above-described configuration according to claim 3 is obtained by adding a specific means for forming the film layer by stretching together with the preform when the preform is stretch-blown. If the in-mold molding method is used, the film can be easily bonded to the preform body at the same time as the preform is injection-molded.
In the case of in-mold, the molten resin presses the film almost uniformly over the entire area at high pressure, so it can be bonded without generating wrinkles or blisters, and smoothing the co-stretching during stretch blow molding. Can be achieved.

In general, the preform is a test tube having a cylindrical body, and the film can be bonded without any problem by in-mold over the entire height of the preform body and the entire circumference. For example, it is possible to easily cover substantially the entire region extending from the shoulder portion to the trunk portion excluding the mouth portion of the casing or the bottom portion.
The preform can be molded by direct blow molding in addition to injection molding.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the preform and the film are made of the same type of synthetic resin.

  According to the above-described configuration, the combination of resins in the same system is highly compatible with each other. Therefore, both resins can permeate and mix with each other at the interface, so-called heat fusion, and can be applied to the wall of the preform. The film can be integrally bonded and fixed, and co-stretching during stretch blow molding can be achieved more smoothly and reliably.

  Here, when the preform and the film are made of a combination of resins of different systems, it does not lead to heat fusion, but stretch blow molding as long as it is in in-mold and at least high pressure in close contact with the heat pressure. In this case, the preform can be re-heated to soften both at the glass transition temperature or higher, thereby enabling co-stretching.

  The means of the invention described in claim 5 is that, in the invention described in claim 1, 2, 3 or 4, the container is decorated with a film layer.

  According to the above configuration of claim 5, since it can be coated in close contact along the shape of the body portion of the container body regardless of the concave-convex structure of the body portion, etc. Unusual unique decoration effect can be given. In addition, such a decoration effect can be exhibited over substantially the entire region of the body portion of the container body.

  According to a sixth aspect of the present invention, in the first, second, third, fourth or fifth aspect of the present invention, the gas barrier property of the container is improved by the film layer.

According to the above configuration of claim 6, the film layer can cover almost the entire region of the body portion in a close contact state, and the film layer is made of a synthetic resin having a high gas barrier property, thereby easily improving the gas barrier property of the container. Can do.
If it is difficult to bond a gas barrier resin film to a preform alone or co-stretch, for example, a resin having a gas barrier property between the adhesive resin and the co-stretchable synthetic resin is sandwiched. Laminated films can also be used.

The present invention has the above-described configuration, and has the following effects.
In the first aspect of the invention, since the film layer formed by stretching with the preform covers the container body at the time of stretching and blowing the preform, regardless of the concavo-convex structure or the protruding structure, There are no wrinkles, slack, gaps, spots, etc., and this film layer can be coated in close contact with the shape of the container body, and various functions such as decorating and gas barrier properties that are not available in the past can be exhibited. it can.

  In the invention according to claim 2, since the film layer covers almost the entire region of the body portion of the container main body, it is possible to exhibit functions such as decorating properties or gas barrier properties over substantially the entire body portion. it can.

   In the invention of claim 3, in the in-mold molding method, the film can be pressed almost uniformly over the entire area of the film at a high pressure by the molten resin, and the film can be formed in a state without generation of wrinkles or blisters. The film can be adhered and the film can be smoothly stretched at the time of stretch blow molding. In general, the preform is a test tube having a cylindrical body, and the film can be bonded to the entire body of the preform without any problem over the entire height and circumference. Thus, it is possible to easily achieve covering over substantially the entire region of the body portion of the container body.

  In the invention according to claim 4, by making the preform and the film made of the same series of synthetic resin, the film can be integrally bonded and fixed to the wall surface of the preform by heat fusion, Stretching of the film during stretch blow molding can be achieved more smoothly and reliably.

In the invention according to claim 5, there is no wrinkles, slack, gaps, spots, etc. regardless of the uneven structure provided on the body part or a protruding object such as a handle function part. A container having a decorative effect in which a printed pattern spreads along the shape of the container main body in substantially the entire region can be provided.
In the film layer, a printed pattern or the like is also expressed by being stretched and deformed, so that it is possible to impart a unique decoration effect that has never existed before.

  In the invention of claim 6, the gas barrier property of the container can be easily improved by covering the substantially entire region of the body portion with the film layer in a close contact state and making the film layer made of a synthetic resin having a high gas barrier property. Can be made.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a half longitudinal front view of a casing 1 which is an embodiment of a synthetic resin container of the present invention. The container body 2 which is a container body is a stretch blow molded product made of PP resin, has a body portion 4 around which a recessed portion 7 which is greatly recessed at an intermediate height position is provided, and has a short cylindrical shape via a shoulder portion 5. The mouth portion 6 is erected integrally.

The outer surface over substantially the entire region of the body portion 4 including the shoulder portion 5 except for the mouth portion 6 and the bottom portion 3 of the heel body 2 was formed by stretching together with the preform when the preform was stretched and blown. The film layer 11 made of random PP resin, which is a synthetic resin of the same system as the heel body 2, is covered in a close contact manner along the shape of the heel body 2 including the recess 7.
The casing 1 of this embodiment is intended to give a decorative property by the film layer 11, and the printed characters "ABC" designed by stretching deformation are deformed and expressed. Unique decor is given. 1 and FIG. 2 to be described later are half-longitudinal front views, but the shape is also shown by a two-dot chain line in the longitudinal section so that the designed character “ABC” can be clearly understood.

Next, an example of a method for manufacturing the casing 1 will be described. (See FIGS. 2 to 5)
The heel body 2 is formed by a step of injection-molding a preform 20 having a bottom portion 21, a body portion 22 and a mouth portion 23 shown in FIG. 2 using PP resin, and the preform 20 is stretch blow-molded. Process.

  Then, in a state where the non-stretched film 25 made of random PP resin, on which the stylized characters “ABC” are printed in advance on the surface, is cylindrical and installed in the cavity mold 32 of the injection mold 30, The core mold 31 is inserted into the cavity mold 32 (see FIGS. 4 and 5), and PP resin is injected from the gate 33 into the cavity 34 to mold the preform 20. As a result, the film 25 is laminated in an adhesive shape over substantially the entire height and circumference of the preform 20 body 22 by an in-mold molding method (see FIGS. 2 and 3).

  Here, the random PP resin is obtained by randomly copolymerizing an ethylene component with a propylene component as a main component, and has a softening temperature and a melting point lower than those of the PP resin forming the bag body 2, and this film 25 While being in-molded and thermally bonded to the wall surface of the preform 20, it has excellent stretchability in combination with being an unstretched film.

  The injection molding of the preform 20 can be carried out under the same conditions as the molding of ordinary PP resin, and the film 25 made of random PP resin is heat-sealed to the preform 20 made of PP resin in a wide temperature range. can do. Further, the portion of the preform 20 to which the film 25 is bonded is a straight cylindrical portion having a constant outer diameter. Further, in the in-mold molding by injection molding, the film 25 is pressed almost uniformly and at a high pressure by the molten resin. Therefore, the film 25 is bonded to the preform wall surface without any wrinkles or blisters locally.

Next, in the stretch blow molding, the preform 20 in which the film 25 is thermally fused and bonded and laminated on the outer surface of the body portion 22 by in-mold molding is formed, and the preform mouth 23 is placed in the mold of the stretch blow molding machine. Set while fixing to the top of the mold.
In the case of PP resin, the resin temperature in stretch blow molding is about 130 to 140 ° C., and the film 25 that is heat-sealed and bonded and laminated to the outer surface of the body portion 22 of the preform 20 is integrated with the preform 20. The film layer 11 is formed on the outer surface of the bag body 2 which is a stretch blow molded product.

  From the above manufacturing method, there are no wrinkles, slackness, gaps, spots, etc., regardless of the recesses 7 formed in the body 4 over almost the entire outer surface of the body 4 and the shoulder 5 of the body 2. Thus, the container 1 can be obtained in which the film layer 11 is integrated with the heel body 2 along the shape of the heel body 2 and laminated in close contact.

  And the housing 1 becomes the shape which the character "ABC" (refer FIG. 2) printed on the film 25 deform | transformed by extending | stretching (refer FIG. 1), and the unique decoration effect which has not been demonstrated is exhibited. Of course, the present invention is not limited to the design of letters, and various patterns can be stretched and deformed so as to be spread over the entire body 4.

In addition, although the container of this invention can use it combining various synthetic resins which form a container main body and a film layer not only in the said Example, the example of another combination is described below. These examples are combinations of the respective synthetic resins, and are the examples in which the film 25 is adhered to the preform 20 by in-mold, and the casing 1 shown in FIG.
[Example 1] By forming the preform from PP resin and the film from polystyrene resin, the film layer could be laminated on the PP resin cage body.
[Example 2] By forming the preform from PET resin and the film from random PP resin, the film layer could be laminated on the PET resin bag body.
[Example 3] By forming a three-layered / five-layered film consisting of a PP resin preform and a PET resin layer / adhesive layer / eval resin layer / adhesive layer / PET resin layer into a film, While being able to laminate | stack, gas barrier property was able to be improved with the eval resin layer.

The present invention is not limited to the above-described embodiments or examples. The container is not limited to a casing, and other molding such as a cup-shaped container that is stretch blow molded using a preform. It can be generally applied to products.
In addition, there are various combinations of the container body and the film layer in consideration of the in-mold formability of the film at the time of molding the preform, the stretchability of the film at the time of stretch blow molding, etc. It can be used in combination.
Further, in the above-described embodiment, it is an example in which the entire main body 2 body portion 4 is covered over the entire height and the entire circumference, but of course, it can be partially covered with a label.

  As described above, the synthetic resin container of the present invention can exhibit various functions such as decorating properties and gas barrier properties that are not conventionally provided by a film layer that is coated in close contact, and can be used in various applications. Be expected.

It is a half vertical front view which shows the housing which is one Example of this invention container. FIG. 2 is a half longitudinal front view showing a preform of the bag body shown in FIG. FIG. 3 is a plan sectional view of the preform shown in FIG. 2 along the line AA. It is a longitudinal cross-sectional view which shows the injection mold for preform shaping | molding shown in FIG. FIG. 5 is a plan sectional view of the injection mold shown in FIG. 4 along the line BB.

Explanation of symbols

1; Housing (container)
2 壜 Body (container body)
3; bottom 4; trunk 5; shoulder 6; mouth 7; recess 11; film layer 20; preform 21; (preform) bottom 22; (preform) trunk 23; (preform) mouth 25 Film 30; injection mold 31; core mold 32; cavity mold 33; gate 34; cavity

Claims (6)

At least a part of the outer surface of the body portion of a container body made of a synthetic resin selected from polyolefin-based trees, polystyrene-based resins, polyester-based resins, polyvinyl chloride-based resins, and polyamide-based resins. A synthetic resin container coated with a synthetic resin film layer formed by stretching together with the preform when the preform is stretch-blown. The synthetic resin container according to claim 1, wherein the container body is covered with a film layer over the entire circumference and substantially the entire height of the outer surface of the body portion of the container body. The film layer is formed by using a preform in which a film that can be co-stretched in advance is bonded to the body portion, and stretching the film together with the preform when the preform is stretch-blown. Synthetic resin container. The synthetic resin container according to claim 3, wherein the preform and the film are made of the same type of synthetic resin. The synthetic resin container according to claim 1, 2, 3, or 4, wherein the container is decorated with a film layer. The synthetic resin container according to claim 1, 2, 3, 4 or 5, wherein the film layer improves the gas barrier property of the container.

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