JPS60172639A - Vessel for drink - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a beverage container, and more particularly to a beverage container having a folded lip suitable for forming a good curl shape as a container for a vending machine.

Conventionally, beverage containers used in vending machines and the like have been known to be made of paper or a laminate made of paper and synthetic resin. However, those made of paper have poor water resistance, require an adhesion process, have low productivity, and are also hygienic. Furthermore, those made of a laminate of paper and synthetic resin have improved water resistance, but productivity and the like are essentially the same as those made of paper. Moreover, these containers made of paper or laminate are lightweight, have adhesives and have uneven thickness, so when used as containers for vending machines, they can avoid falling defects. There wasn't.

Therefore, the present inventors previously proposed a beverage cup for vending machines etc. obtained by molding a polyolefin resin composition material containing an inorganic filler (Japanese Patent Application No. 58-1961).
Specification No. 50, Japanese Patent Application No. 58-115154 1).

These containers proposed earlier are made by curling the flanged container obtained by aging using various curling devices to increase the strength of the container and prevent injury to hands and lips during use. This facilitated application to vending machines.

However, the curling process for containers made of the above-mentioned materials requires a relatively high molding temperature, and it is difficult to obtain beverage containers with a good curled shape through the curling process, as the rigidity decreases rapidly at the molding temperature. It is. Therefore, a beverage container having a good curling shape is a container that can be easily obtained by a normal curling process, has good aging formability, punching property from a sheet, etc., and has excellent container cutability. As a result of research to develop a beverage container, the inventors discovered that a container with a specific shape would achieve the objective, and completed the present invention.

That is, the present invention is a beverage container with a circular opening and a folded rib, which is formed from a resin composition material containing 30 to 80% by weight of a polyolefin resin and 70 to 20% by weight of an inorganic filler. It is composed of a first bent part 11 + horizontal part, a second bent part I2 and a tip part H,
And the length of the tip H and horizontal part is H = (1±0.3)
The relationship is XD, and the bending angle θ of the tip H is θ=5
This is a beverage container characterized by a temperature of ±3 degrees.

The polyolefin resin in the present invention is not particularly limited and may include various resins, such as polyzolopyrene resin, polyethylene resin, and polybutene resin.

Examples of the polypropylene resin include homopolymers of zolopylene, block copolymers and random copolymers of zolopylene and 30% by weight or less of other α-olefins such as ethylene, and mixtures thereof. Further, the melt index of this polypropylene resin is generally o.i to 5 g/10 min, preferably 0.5 g/10 min.
2-3 cycles/10 minutes, more preferably 0.3-1.5 cycles7
It is 10 minutes long. In this case, if the melt index exceeds 59/10 minutes, the melt strength of the sheet will be low, and if the melt index is less than 0.1! This is not sufficient, and secondary moldability such as aged molding becomes difficult.

On the other hand, there are various types of polyethylene resins.
Examples include high-density polyethylene, medium-density polyethylene, and low-density polyethylene, and in addition to ethylene homopolymers, there are also random or block copolymers of ethylene and 30% by weight or less of other α-olefins (propylene, etc.). Here, high-density polyethylene has a density of 0.940-0.9709/cm3, medium e
Low-density polyethylene includes high-pressure polyethylene, medium-density polyethylene,
Ethylene and propylene obtained by low pressure method, butene-1,
4-methylpentene-1, octene-1, etc. with 3 or more carbon atoms
There are copolymers with 12 α-olefins, so-called linear low density polyethylene (LLDPE). In addition, the melt index of this polyethylene resin is usually 0.02 to 10 minutes, preferably 0.03
~5.09/10 minutes, more preferably 0.04-2. (
It is 1/10 minute. If the melt index of the polyethylene resin is outside of the above range, it is unfavorable in terms of secondary moldability such as melt crosslinking, sheet moldability, and thermoforming.

The polyolefin resin in the present invention may be the above-mentioned polyzolopyrene resin, polyethylene resin, or polybutene resin, etc., which may be used alone or appropriately mixed. In order to carry out continuous mass production by secondary molding, it is effective to use a mixture of the above-mentioned polyzolopyreno resin and polyethylene resin. The mixing ratio of polyzolopyrene resin and polyethylene resin in this mixture is not particularly limited, but generally the former:latter = 9:1 to 1:9 (
(weight ratio), preferably 7:3 to 3 (weight ratio).

Next, various inorganic fillers can be used without particular limitation. For example, talc, clay, calcium carbonate, calcium sulfate, magnesium carbonate.

Barium sulfate, titanium oxide, silica, or a mixture thereof can be used. Particularly suitable is talc alone or a mixture of Merck and titanium oxide.

The container of the present invention is formed from a resin composition containing the above polyolefin resin and an inorganic filler.

Here, the blending ratio of both is polyolefin resin 30 to 8
0% by weight, preferably 35-70% by weight and inorganic filler 70-20% by weight, preferably 65-30% by weight. When the blending ratio of the inorganic filler exceeds 70% by weight, moldability deteriorates, and when it is less than 20% Bi,
It is undesirable because it is inferior in rigidity and disposal. In addition, when talc and titanium oxide are used together, the proportion of titanium oxide is 1 to 10% by weight, preferably 2 to 10% by weight, based on the resin composition.
The range is 7%.

In principle, the beverage container of the present invention is made from a resin composition consisting of a polyolefin resin and an inorganic filler as described above, but if necessary, ethylene-propylene rubber is used for beverages or to an extent that does not affect the physical properties of the container. It is also possible to add rubbers such as, polyolefins modified with unsaturated carboxylic acids or derivatives thereof, various fillers, various antioxidants, antistatic agents, lubricants, colorants, etc.

The resin composition used in the present invention can be prepared by kneading the above-mentioned components using a conventional kneading method.
That is, it can be obtained by sufficiently kneading with a roll, a Banbury mixer, a two-screw extruder, or the like.

The beverage container of the present invention is obtained by pelletizing the resin composition and then forming it into a sheet using an extruder such as a T-die type or a calendar roll to obtain a sheet with a thickness of 0.5 to 1.5 mm. Next, the sheet is obtained by differential pressure molding. Differential pressure molding can also be performed continuously after sheet molding without reheating. Here, differential pressure molding broadly refers to a molding method that utilizes a pressure difference, and specifically includes thermoforming, such as vacuum forming, pressure forming, solid state pressure forming, and the like. This molding method is suitable because it allows a large number of containers to be molded at once and enables mass production.Secondly, containers with no seams, no uneven thickness, and no uneven thickness can be obtained.

In this way, a beverage container with a circular opening having a folded lip is obtained; however, according to the present invention, a mold suitable for molding a container having the following features as described below is used. .

One folded lip between beverage containers has the shape shown in Fig. 2, and is composed of a first bent part I+ + horizontal base D, a second bent part 2, and a tip H. x tips H
The length of the horizontal part is in the relationship H-(1±0.3)XD, and the bending angle θ of the tip H is θ-5±3 degrees. Here, D (1 bend, the distance between the bend 1 and the bend point 2, usually about 0.5 to 3.0 degrees. Also, the angle d is the perpendicular line at 1 to the bend and the inner surface of the tip H. is the angle between the tip H1
If the bending angle θ is outside the honorable value specified in the present invention, as will be clear from the examples shown later, when curling is performed, a desired shape of curl cannot be obtained, and as a result, when used in a vending machine, The automatic fall properties are poor, and in fact, there is no need for it.

Further, in the beverage container of the present invention, the folded IJ is preferably formed as follows. Inflection point 2 and inflection point 3
The length of the first bent part 11, which is the horizontal distance between (04±
0.2）
~30 degrees, preferably ~10 degrees. Also,
In the case of a two-stage expansion container in which the expansion angle is changed at bending point a in Fig. 1, the second stage expansion part has an angle β of approximately 3 to 10
It is preferable to form an arc with a radius of 100 to 300 degrees. In addition, as shown in Figure 1, the bottom of the container has an anti-cutter for forming a stack.
may be provided. In this case, the undercut height is 3
~10 笁 is appropriate.

The beverage container obtained according to the present invention can be subjected to a conventional curling process, for example, using a three-roll curling device, to produce a container with an extremely good curl shape. That is, when this container is used in a vending machine, the curled shape has a serious effect on the container's suitability for cutting, and the shapes shown in Figure 3 a - c are bad, and the shapes shown in Figure 3 d and e are bad. However, the beverage container obtained according to the present invention can be made into a good curled shape by ordinary curling treatment.

Moreover, the beverage container of the present invention has a white, high-grade paper-like appearance and texture due to the use of talc or a combination of talc and titanium oxide9, and the curling process results in a container with good strength and cutability, and is less likely to fall. Such problems are unlikely to occur. In addition, from a manufacturing standpoint, it has the advantage that the container has excellent thermoformability, particularly mold releasability, and punching properties from sheets are also good.

Therefore, the beverage container of the present invention is extremely useful, especially in the manufacture and use of containers for vending machines.

Next, the present invention will be explained by examples.

Examples 1 to 5 and Comparative Examples 1 to 5 Polyglopylene homopolymer (density 0.91 g7cm
3° Melt Index (MI), 0°6! ;l/1
0 min) 25% by weight, high density polyethylene (density 0.96
4 Vm3゜MI 0.4 g/l 0 min) 25% by weight
After kneading and pelletizing 46% by weight of talc and 4% by weight of titanium oxide having an average particle size of 15 μm using a Banbury mixer, a sheet having a thickness of 1 mm was obtained using an extrusion molding machine. Next, containers having the dimensions shown in Table 1 are molded using various molds in a pressure forming machine at a pressure of 6 kg/cnr2. A beverage container was obtained by molding at a molding temperature of 160°C.

Next, the opening of the container was curled using a three-roll curling device. The resulting curl shape is shown in Table 1.

[Brief explanation of drawings]

FIG. 1 shows a partially cutaway front view of an example of the beverage container of the present invention. Fig. 2 is a partial explanatory view of the folded lip of the opening of the beverage container of the present invention, Fig. 3 a + b + C + d and e
indicates a curl shape. 1.2. and 3... bending point, H... tip,
D...Horizontal part, 11 First bent part, ■2... Second bent part, θ... Bending angle of tip part Fig. 3 de Fig. 2

Claims (4)

[Claims] (1) A beverage container with a circular opening and a folded lip, which is formed from a resin composition containing 30 to 80% by weight of a polyolefin resin and 70 to 20% by weight of an inorganic filler. 1 bent part II + horizontal part,
A food container consisting of a second bent part 2 and a tip H, and the length of the tip H and the horizontal part is H. (2) The horizontal distance of the first bending part ■1 is (0,4±02)
The container according to claim 1, which is ×D. (3) The container according to claim 1, wherein the angle α of the bending point 2 is 0 to 30 degrees. (4) Claim 1 in which the inorganic filler is talc
Containers listed in section.