JP2019026335A - Paper resin composite cap and liquid container made of paper using the same - Google Patents

Abstract

To provide a paper resin composite cap which can be abandoned as paper without discriminating a spout and a cap, further can be formed to a free cap shape, and a liquid container made of paper using the same.SOLUTION: A paper resin composite cap of this invention is one that a paper resin composite material where a paper ingredient of more than 50 mass% and less than 90 mass% is mixed in a resin ingredient is formed to a cap shape. Cellulose fiber lengths of the paper ingredient are preferably not less than 30 μm and less than 300 μm. And in a liquid container made of paper of this invention, a spout 2 and a cap 3 mounted to a container body 1 made of paper is formed by a paper resin composite body where the paper ingredient of more than 50 mass % and less than 90 mass% is mixed in the resin ingredient.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a paper resin composite cap that can be easily discarded and a paper liquid container using the same.

  The material of the cap used for the spout of the container is generally a metal or a resin, and most of the caps for paper liquid containers that have been widely used in recent years are made of resin.

  Paper liquid containers are disposed of as waste after consuming the liquid content in each household, but many local governments require residents to separate and dispose of paper and resin. For this reason, the consumer needs to separate the cap and the part called spout for attaching the cap from the container body of the paper liquid container, and put them in separate waste collection bags for disposal.

  However, since the container body and spout of the paper liquid container are firmly joined so that the liquid contents do not leak during transportation, it is not easy to separate the spout from the container body, especially with fingers. This is a very difficult task for the elderly who have become weak.

  In order to solve this problem, Patent Document 1 discloses a paper liquid container in which both a spout and a cap are made of paper. However, the spout and cap are made of a material in which a thermoplastic resin layer is laminated on the inner and outer surfaces of a paper base material, so it cannot be formed into a free shape like metal or resin, and is simply a cylindrical shape. I had to make it a shape. Therefore, the PP function (pill fur proof function) generally used for metal caps and resin caps cannot be provided. Also, the degree of freedom of design was greatly limited.

Japanese Patent No. 4238613

  Accordingly, the object of the present invention is to solve the above-mentioned conventional problems, and to dispose of the spout and cap as paper after consumption without disposing of the paper, and to make a free cap shape, and to this It is providing the paper-made liquid container using this.

  As a result of repeated studies to solve the above problems, the present inventor has found that the composite material of paper and resin can be discarded as paper if the ratio of the paper component exceeds 50% by mass, and the cellulose fiber is contained in the resin. It was confirmed that the kneaded composite material can be molded in the same manner as the resin.

  The present invention has been completed based on such knowledge, and the paper resin composite cap of the present invention is a paper resin in which a paper component of more than 50% by mass and less than 90% by mass is kneaded in the resin component. The composite material is formed into a cap shape.

  As in claim 2, the paper resin composite material preferably further contains a dispersant. Further, as in claim 3, the cellulose fiber length of the paper component is preferably 30 μm or more and less than 300 μm.

  The paper liquid container of the present invention is a paper resin composite in which a spout and a cap attached to a paper container main body are kneaded in a resin component with a paper component of more than 50% by weight and less than 90% by weight. It is characterized by being molded. As in claim 5, it is preferable that the paper resin composite material further contains a dispersant.

  Since the paper resin composite cap of the present invention and the paper liquid container using the same are obtained by kneading a paper component of more than 50% by mass and less than 90% by mass in the resin component, it can be discarded as paper. . For this reason, it is not necessary to separate the spout from the container main body when it is discarded as in the prior art, and the elderly can easily dispose of it.

  In addition, the paper resin composite cap of the present invention is not a material in which a thermoplastic resin layer is laminated on the inner and outer surfaces of a paper base as in the past, but kneaded cellulose fibers that are paper components in the resin, It can be formed into a cap shape, can have a PP function, and can secure a degree of design freedom. In particular, if the cellulose fiber length of the paper component is less than 300 μm, the moldability is improved.

It is a perspective view of the paper liquid container of an embodiment. It is a perspective view of the paper liquid container of other embodiments. It is a perspective view of the paper liquid container of other embodiments. It is a perspective view of the paper liquid container of other embodiments. It is a perspective view of the paper liquid container of other embodiments. It is a perspective view of the paper liquid container of other embodiments. It is a perspective view of the paper liquid container of other embodiments.

Embodiments of the present invention will be described below.
FIG. 1 is a perspective view of a paper liquid container according to an embodiment of the present invention, in which 1 is a paper container body, 2 is a spout attached to the upper part, and 3 is an extraction port 4 of the spout 2. It is a paper resin composite cap. The paper resin composite cap 3 includes a ring 5 for PP function.

  The paper container main body 1 is made of a material in which a thermoplastic resin layer is laminated on the inner and outer surfaces of a paper base material as in the conventional case, but the paper resin composite cap has a paper content of more than 50% by weight and less than 90% by weight. A paper resin composite material in which components are kneaded in a resin component is formed into a cap shape, and the spout 2 is also formed from the same paper resin composite material.

  Specifically, a cellulose fiber that is a paper component is kneaded with a thermoplastic resin such as polyethylene or polypropylene. As the cellulose fiber, one obtained by collecting a piece of paper material generated in the manufacturing process of the paper container body 1 or one obtained by dissociating and pulverizing used paper collected from the market can be used.

  The cellulose fiber length is preferably 30 μm or more and less than 300 μm. When the cellulose fiber length is 300 μm or more, the fluidity is lowered and the moldability is lowered. Conversely, in order to pulverize until the cellulose fiber length is 30 μm or less, the pulverization cost increases, which is not preferable.

  The paper resin composite material is obtained by kneading a paper component of more than 50% by mass and less than 90% by mass in the resin component. Since it cannot be discarded as paper unless the paper component exceeds 50% by mass, the object of the present invention cannot be achieved. On the contrary, when the paper component is 90% by mass or more, the resin component is relatively lowered, so that the fluidity is lowered and it is difficult to mold into a cap shape.

  The paper resin composite material preferably further contains a dispersant. The dispersant is a component for uniformly dispersing the cellulose fibers as the paper component in the resin component, and the content is preferably about 5 to 20% by mass.

  As the dispersant, for example, stearic acid can be used. However, the dispersant is not limited to stearic acid, and higher fatty acid salts such as zinc stearate and calcium stearate, higher fatty acid esters, and the like can also be used.

  A general injection molding method can be adopted as the molding method. The paper resin composite material is formed into pellets without being melt-mixed by a disk die type pelletizer, for example, and supplied to an injection molding machine. As the molding method, a compression molding method may be employed. Since injection molding is possible in this way, it can have a complicated shape similar to the conventional one, and can also have a PP function.

  In addition, it is preferable to comprise a contact surface with the content only with a resin component, and a surface layer can be made into a resin component in injection molding or compression molding. In addition, the inner surface can be reliably used as a resin component by insert molding, double injection molding, coating, or the like.

  The molded spout 2 and the paper resin composite cap 3 are attached to the paper container main body 1 in the same manner as in the past, and become a paper liquid container. In order to prevent the liquid filled therein from seeping out, it is preferable that the spout 2 and the paper resin composite cap 3 have a structure in which the contact surface with the contents is composed only of the resin component. If normal injection molding is performed, the resin component with excellent fluidity contacts the inner surface of the mold and solidifies, so the contact surface with the contents can be composed only of the resin component, but to increase certainty It is also possible to arrange the resin film on the contact surface with the contents.

  The paper resin composite cap thus obtained and the paper liquid container using the same are made by kneading a paper component of more than 50% by mass and less than 90% by mass in the resin component. There is no need to separate the spout 2 and the paper resin composite cap 3 from the container body 1, and it can be discarded as paper. Moreover, since it can shape | mold in arbitrary shapes, the freedom degree of a design is not restrict | limited.

  The shape of the paper container main body 1 and the paper resin composite cap 3 is not limited to the shape shown in FIG. 1, and may be the shape as in other embodiments shown in FIGS. 2 to 7. Further, the mounting position of the paper resin composite cap 3 is not limited.

  Carton scrap generated in the blank cutting process, which is the raw material for the milk paper carton, was collected and pulverized while leaving the resin layer on the surface to obtain a paper component having a fiber length in the range of 30 μm to less than 300 μm. This was dried and then mixed with polypropylene as a resin component. Further, stearic acid as a dispersant was added, and pelletized without being melt mixed by a disk die type pelletizer.

  The ratio of each component was changed as shown in Table 1, and the moldability was visually evaluated in 4 stages of × Δ ○. Formability x means that molding is impossible. Also, paper that can be discarded as it is is defined as discardability. In addition, the numerical value of each component is mass%.

  Numbers 1 to 5 within the scope of the present invention all have a formability of ◎ to △ and can be discarded as paper as they are, so the discardability was also good. Number 6 having a paper component of 90% by mass or more was poorly molded due to insufficient resin component. Number 7 with a paper component of 40% by mass was ◎, but it could not be discarded as paper.

  Next, a molding test for evaluating the relationship between the fiber length and the moldability was performed. Fixed to the composition of No. 1 above (paper component 51%, resin component 40%, dispersant 9%), only the cellulose fiber length is changed as shown in Table 2, and caps are injection molded, and formability such as threads Was visually evaluated.

  Caps could be molded with any fiber length, but when the fiber length exceeded 300 μm, very fine “squeezing” was observed in part of the thread. When the fiber length exceeded 400 μm, fluidity began to be affected, and it was necessary to change the molding temperature and adjust the injection time. Furthermore, when the fiber length was 1000 μm, the sealability of the cap was not affected, but “shrinkage” that was easily visible was observed.

  As described above, the present invention provides a paper resin composite cap that can be discarded as paper without being separated and can be formed into a free cap shape, and a paper-made liquid container using the same. It is.

1 Paper container body 2 Spout 3 Paper resin composite cap 4 Extraction port 5 Ring

Claims (5)

  A paper resin composite cap, wherein a paper resin composite material obtained by kneading a paper component of more than 50% by mass and less than 90% by mass in a resin component is molded into a cap shape.   The paper resin composite cap according to claim 1, wherein the paper resin composite material further contains a dispersant.   The paper resin composite cap according to claim 1, wherein the cellulose fiber length of the paper component is 30 μm or more and less than 300 μm.   A paper liquid characterized in that a spout and a cap attached to a paper container main body are formed by a paper resin composite in which a resin component is kneaded with a paper component of more than 50% by weight and less than 90% by weight. container.   The paper liquid container according to claim 4, wherein the paper resin composite material further contains a dispersant.

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