JPS5820776B2 - Dannetsu Seiyoukino Seizouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulating container made of an insulating material on the outside and a thermoplastic resin on the inside.

The conventional molding method for insulating containers is injection molding.

There are vacuum molding methods, foam molding methods, etc., and the foam molding method was particularly used as a method for manufacturing foam molded products.

According to this method, a container with very good heat insulation effect can be obtained, but the resin is expensive and the molding equipment is expensive, so it is suitable only for mass production and not for small quantity production. .

There is also a double container, which is made by combining two containers with different ribs by compressing or vacuum forming plastic sheets, creating an air layer between the containers to provide insulation. Since it is not possible to directly print on the X1 container, which tends to deform when poured, it has disadvantages such as poor workability, such as having to wrap the printed film afterwards.

Furthermore, when incinerating the expanded styrene containers and double containers, a large amount of heat is consumed and a large amount of soot is generated.

Paper cups are available as a solution to the above drawbacks, but while paper cups do not pose any problems when incinerated, their use is limited due to their lack of rigidity in large capacity containers.

The object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to produce a simple and heat-insulating container from a sheet in a simple manner.

The present invention will be explained in detail below.

The present invention is a manufacturing method by applying a thermoplastic resin to a rolled sheet, molding the sheet with a mold, and punching out the sheet to the size of the container.

To explain according to the drawings, as shown in Fig. 1, a foamable sheet 1 made of polyethylene grafted with polar vinyl groups, to which an inorganic filler, a foaming agent, and, if necessary, a stabilizer have been added, is sent out, and a foam is placed on the foamable sheet 1. From extruder 2 and T-die 3,
A thermoplastic resin 4 such as polyethylene or polypropylene is applied by extrusion.

At this time, it is preferable to add 30% to 50% by weight of an inorganic filler to the foamable sheet.

Next, the foamable sheet 1 is passed through a heater 5 to dry the thermoplastic resin 4, heat and foam the foamable sheet 1, and bring the foamable sheet 1 to the temperature required for the next molding.
and preheating the thermoplastic resin 4.

The heated and foamed sheet is molded into the shape of a container using a male mold 6 and a female mold T each having a desired container shape.

The molding method may be air pressure molding or vacuum molding as appropriate.

A molded product 9 is obtained by cutting the molded sheet 8 thus molded from a cutting section 10 having the shape and size of a container as shown in FIG.
get.

The sheet portion 11 other than the molded product 9 cut by the cutting section 10 can be rolled up.

As described above, in the present invention, since polyethylene grafted with polar vinyl groups is used, the moldability of the sheet does not deteriorate even if the amount of the inorganic filler exceeds 30% by weight.

With conventional products, if the content is 20% by weight or less, it is well dispersed, but if the content is 30% by weight or more, filling is possible, but the plasticity increases and molding is extremely difficult.

In addition, since the outer layer is made of a foamed sheet, it can be easily held with bare hands even if hot items such as boiling water are poured into the container.Also, since it is filled with an inorganic substance, it can be used even if the amount of resin is small. It was possible to obtain a container with the same volume as that of the previous one, and the amount of heat and soot produced during incineration was small, making it easy to incinerate and solving the problem of pollution.

Further, according to the method of the present invention, the manufacturing method and mold are simple, and the cost is sufficiently satisfied in both mass production and small quantity production.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of the present invention, and FIG. 2 is a partial plan view of part A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Foamable sheet, 4... Thermoplastic resin, 6... Male type, 7... Female type, 8...
... Molded sheet, 10 ... Cutting part.

Claims (1)

[Claims] 1 Polyethylene grafted with polar vinyl groups from 30 to
A method for producing a heat insulating container, which comprises heating a foamable sheet containing 50% by weight of an inorganic filler and a blowing agent and coating a polyolefin thereon, and then forming the sheet under pressure or vacuum in a desired mold.