JPH06191567A - Manufacture of heat insulating container made of plastic - Google Patents

Abstract

PURPOSE:To improve heat insulation and appearance and simplify separation as waste by forming an outer package into a conic shape using cold sealing agent of natural rubber and applying cold sealing agent of rubber also on an inner face of the package to make the package integral with a container body. CONSTITUTION:A container body 5 comprises a plastic sheet in a cup-like shape, and height and interval of ribs 6 is determined according to a purpose, etc. An outer package 1 is made of an originally sector-shaped paper sheet wherein cold sealing agent A of natural rubber is applied on its surface and rear faces of both ends 2, 2a while cold sealing agent A of rubber is applied on a periphery on the rear face, and the sheet is rolled into a cone with both ends 2, 2a adhered to each other. This outer package 1 is fitted around the container body 5 to be pseudo-adhered to the ribs 6. Height of the outer package 1 is set essentially to the same as that of the container body 5. Thus the container is good in appearance and is not hot when being held in a hand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat insulating container made of plastic which has a high heat insulating property and is effective when treated as a waste.

[0002]

2. Description of the Related Art In the case of plastic containers used for instant noodles, miso soup, etc., heat insulation is required. As this means, a styrofoam container having a heat insulating effect on the material itself is generally used, but in the case of this styrofoam, there is a problem that harmful gas is generated when incinerated as waste. Therefore, it is known that the container body is molded thinly with plastic other than Styrofoam, for example, polypropylene, and a rib is formed on the body of the container, and the outside of the rib is covered with a plastic film or paper for heat insulation and label printing. is there.

[0003]

However, in the above-mentioned publicly known example, in which the plastic film is used for the exterior body, a high heat transfer portion is formed in a streak shape at the rib portion, and it feels hot when held in the hand. There is a drawback that. On the other hand, in the case of a paper exterior body, in the manufacturing process, a flat folded product is returned to the cylindrical shape (cone) and externally inserted into the container body, so even if it becomes a product, this fold will remain and it will look good. It has the drawback of being bad. Also, in the case of this paper product, since the exterior body is attached to the container body side using a starch-based or chemical-based adhesive, it becomes waste and the container body (plastic) and the exterior body (paper) are separated. When it is separated and treated, there is a drawback that it is difficult to peel and the paper remains on the container body side. In the manufacturing process,
For example, when an organic solvent type adhesive is used, it takes time for the solvent to be scattered and dried. In addition, since the adhesiveness of the adhesive remains as it is, it cannot pass between the rolls, and the mechanical adaptability is poor. Similarly, in the case of a water-soluble pressure-sensitive adhesive, these conditions are further deteriorated and problems remain.

It is an object of the present invention to propose a method for producing a plastic heat insulating container which has excellent heat insulating properties, looks good, is easy to separate as waste, and is excellent in productivity.

[0005]

The method for manufacturing a plastic heat insulating container according to the present invention is as follows.

A rib is formed on the body and the body of the thin plastic container body is bonded to the body of the body using a cold sealant made of natural rubber to form a cylindrical shape, and a desired position on the inner surface of the body is formed. A method for manufacturing a plastic heat-insulating container in which a paper outer body coated with a natural rubber cold sealant is slipped on to prevent slipping and the container body and the paper outer body are integrated.

[0007]

The container body is formed by vacuum pressure forming of a plastic sheet or injection method, and is basically cup-shaped, and the height and interval of the ribs are determined by the purpose of use. Paper is used for the exterior body, and label printing or the like is arbitrarily performed on the surface. This exterior body is initially fan-shaped flat paper, and natural rubber-based cold sealant is applied to the front and back at each end, and the back surface is covered with rubber-based cold sealant. -A sealing agent is applied, and it is formed into a cone shape by rolling and bonding both ends. This step can be performed by a mandrel, and is externally attached to the body portion of the container body to be pseudo-bonded to the container body side (rib). The heights of the exterior body and the container body are basically set to be the same. Also, if the container body and the lower part (bottom side) are left as they are, a gap will be created between the container body and the exterior body, so should the outer diameter on the bottom side of the container body be the same as the height of the ribs? By forming the rib so that the height of the rib becomes lower toward the bottom side, and finally, the rib is formed so as to intersect with the outer diameter of the bottom at zero, it is possible to eliminate the gap.

[0008]

EXAMPLE FIG. 1 shows a method for manufacturing an exterior body. In FIG. 1 (a), 1 is a fan-shaped paper, and a natural rubber cold sealant A is applied to the front and back of both ends 2 and 2a. Along with the back side (inner surface) along with the natural rubber cold sealant A
Is an exterior body coated with. This outer package 1 is wrapped around a mandrel 3 as shown in FIG.
Are overlapped with each other, and the overlapped portions are pressed by the bar 4 to be bonded as shown in FIG. 3C, and are removed from the mandrel 3 to form a cone shape as shown in FIG.

As shown in FIG. 2 (a), the container body 5 having ribs 6 formed on the body is inserted from above from the exterior body having the above-mentioned shape, and the exterior body is pushed by the push bar 7 as shown in FIG. 2 (b). 1
Push the container body 5 into the inside and seal the sealant A on the inner surface into the ribs 6.
Adhere closely to the tip of and make a pseudo bond. This situation is (c)
FIG. 3 is an enlarged view showing the relationship between the rib 6 and the outer casing 1. The properties of the natural rubber cold sealant are as follows.

Appearance Milky white emulsion Main component Natural rubber latex Solid content 58% Viscosity 80 CPS (B type, 60 rpm, 25 ° C) PH value 10.5 (25 ° C)

The present invention produces the following effects by producing a plastic heat insulating container by the above production method.

A. By using paper for the exterior body, there is a heat insulating effect even at the tip portion of the rib, and it does not become hot.

B. The exterior body can be molded into a cone shape with a mandrel and is bonded using a natural rubber cold sealant, so handling is easy and productivity is high. Further, since the natural rubber cold sealant is applied to the inner surface of the outer package, the outer package has an anti-slip effect and cannot be removed from the container body.

C. Since the outer body of the cone shape and the container body are integrally combined and the outer body is not folded flat like in the known example, there is no possibility that folds remain and the appearance is not deteriorated.

D. When the waste is treated as a waste, since the outer casing is only pseudo-bonded, it can be easily pulled out from the container body and separated.

E. Since a natural rubber cold sealant is used for the adhesive, it has biodegradability and does not cause pollution problems.

[Brief description of drawings]

FIG. 1A is a development view of an exterior body.

FIG. 1 (B) is an explanatory view of a state in which an exterior body is wound around a mandrel.

FIG. 1 (C) is an explanatory view showing a state where both ends of an outer package are adhered.

FIG. 1 (D) is an explanatory view of a state in which an outer casing is formed in a cone shape.

FIG. 2A is an explanatory diagram of an outer package and a container body.

FIG. 2 (B) is an explanatory view showing a state where the container body is inserted into the exterior body.

FIG. 2 (C) is an explanatory view of a state in which the exterior body and the container body are combined and integrated.

FIG. 3 is an explanatory diagram of a relationship between an exterior body and a container body (rib).

[Explanation of symbols]

 1 Outer body 2, 2a Both ends 3 Mandrel 4 Bar 5 Container body 6 Rib 7 Push bar

[Procedure amendment]

[Submission date] December 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

1 to 4 show a method of manufacturing an exterior body .
In 1, the paper is formed into a fan shape, and the natural rubber cold sealant A is applied to the front and back of both ends 2 and 2a and the natural rubber cold sealant A is applied along the back side (inner surface). It is the applied exterior body. As shown in FIG. 2 , a mandrel 3 is wrapped around the outer casing 1 so that the portions of the sealant A on both ends thereof are overlapped with each other, and as shown in FIG. Mandrel 3
It is molded into a cone shape as shown in FIG .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

As shown in FIG. 5 , the container body 5 having ribs 6 formed on the body portion is inserted into the exterior body 1 having the above-described shape, and the exterior body 1 is pushed by a push bar 7 as shown in FIG. The container body 5 is pushed into the inside, and the sealant A on the inner surface is brought into close contact with the tips of the ribs 6 to be pseudo-bonded. This situation is shown in Figure 7. FIG. 8 is an enlarged view showing the relationship between the ribs 6 and the exterior body 1. The properties of the natural rubber cold sealant are as follows.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a development view of an exterior body.

FIG. 2 is an explanatory view of a state in which the outer body is wound around a mandrel.

FIG. 3 is an explanatory view of a state in which both ends of the exterior body are adhered.

FIG. 4 is an explanatory view of a state where the outer casing is formed in a cone shape.

FIG. 5 is an explanatory diagram of an exterior body and a container body.

FIG. 6 is an explanatory view showing a state where the container body is inserted into the outer package.

FIG. 7 is an explanatory view of a state in which the outer body and the container body are combined and integrated.

FIG. 8 is an explanatory diagram of a relationship between an exterior body and a container body (rib).

[Explanation of reference numerals] 1 exterior body 2, 2a both ends 3 mandrel 4 bar 5 container body 6 rib 7 push bar

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 7]

[Figure 5]

[Figure 6]

[Figure 8]

Claims (1)

[Claims] 1. A rib is formed on a body portion and a thin-walled plastic container body is attached to the body portion using a cold sealant made of natural rubber to form a cylindrical shape. A method for manufacturing a plastic heat-insulating container in which a paper outer body coated with a natural rubber cold sealant is slipped onto a desired position to integrate the container body and the paper outer body.