JPS60172640A - Drink vessel for vending machine - 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 for a vending machine, and more specifically, to a vending machine which has excellent stacking storage stability, is resistant to falling over, and has good ability to cut each container one by one and fall down. related to beverage containers.

Conventionally, containers for vending machines are known to be made of paper, two synthetic resins, or a laminate film made of paper and synthetic resin. Although paper containers are lightweight and have excellent incineration properties, they have poor water resistance and require an adhesive process to manufacture, resulting in low productivity. For this reason, efforts have been made to improve water resistance by using a laminate made of paper and synthetic resin, but the manufacturing process is the same, so productivity is low, and because there are cut surfaces, water resistance is insufficient. Unfortunately, no real solution has been reached. Furthermore, because paper containers or laminate containers made of paper and synthetic resin are lightweight and have non-uniform adhesive parts, when used as containers for vending machines, they do not fall easily and cause problems. Inevitable. Moreover, when printing on the container, there is a drawback that the printing may shift at the adhesive part.
Therefore, the present inventors first matured a sheet made of a resin composition material consisting of a polyolefin resin and an inorganic filler, which has excellent water resistance, productivity, appearance strength, and waste disposal properties. In addition to the properties required for beverage containers for vending by curling flanged containers, we also have stacking characteristics.

Drop characteristics, etc. are required. In particular, long-term stability is required in properties such as stability when storing a large number of containers in a stacked state, the degree of toppling, and the ability of containers to break and fall during use.

Therefore, the present inventors conducted repeated research to develop a beverage container for vending machines with even better stacking and falling properties (while maintaining the above-mentioned excellent properties). The inventors discovered that a container having a specific shape satisfies these characteristics, and based on these findings, the present invention was completed.

That is, the present invention provides a beverage container for a vending machine, which is formed of a resin composition containing 30 to 80% by weight of a polyolefin resin and 70 to 20% by weight of an inorganic filler, and whose opening periphery is curled. From the bottom to the middle part constitutes a first widened part with an angle (α) of 3 to 10 degrees, and from the middle part of the container to the opening constitutes an arc-shaped second widened part with a radius (R) of 50 to 300 m + o, And the difference in expansion (β) between the extension line of the first expanded portion and the end of the second expanded portion at the container opening is 0.3.
This is a beverage container for a vending machine characterized by having a size of ~2fi.

The polyolefin resin used in the present invention is not particularly limited, and includes, for example, polypropylene resin.

Examples include polyethylene resin.

Examples of the cocotepholypropylene resin include homopolymers of propylene, block copolymers and random copolymers of propylene and other α-olefins such as 30 ffiffi% or less of ethylene, and mixtures thereof. In addition, the melt index (M) is a, 1y/1o or more, preferably o, 2ff/
1 o min or more is used @ M engineering is 0.1 g-7
If the melting time is less than 10 minutes, the melt viscosity is high, the uniformity of mixing with the inorganic filler is insufficient, and the moldability of the container is also poor, which is not preferable.

In order to manufacture the beverage container for vending machines of the present invention by differential pressure molding such as vacuum or compressed air, it is preferable to use a container with a M-work of 5 p/1o min or less from the viewpoint of melt strength. Further, the selection of the polypropylene resin can be made as appropriate, taking into consideration the heat resistance, rigidity, cold resistance, etc. required by the inorganic filler compounder, the size of the beverage container, etc.

There are also no particular restrictions on the polyethylene resin, including high-density polyethylene and medium-density polyethylene.

There is low-density polyethylene, in addition to ethylene homopolymers, ethylene and other α-polymer such as propylene with less than 30%
- Random or bulk copolymers with olefins. Here, high density polyethylene has a density of 0.
94'O~0.97of/alt.

(medium/low density polyethylene)-1, then: ethylene and propylene obtained by φ polyethylene or medium/low pressure method, butene-1,4-methylpentene-1, octene-1, etc. There is a copolymer of 12 α-olefins, so-called linear low density polyethylene. Here, M work is 0.02 to 10.0 P/i 0 minutes, preferably 0.0
5 to 5.0 ft/1 a is preferred. However, when only polyethylene resin is used, it is preferable to use medium- to high-density polyethylene with a density a of 95 of/cd or more, and in particular, a resin with a wide molecular weight distribution with little drawdown is preferably used.

In the present invention, although it is possible to use a polyolefin resin alone, it is effective to use a blended composition of the above-mentioned polypropylene resin and polyethylene resin. At this time, it is more effective to use a combination of high-density polyethylene and low-density polyethylene as the polyethylene resin.

In this case, polypropylene fruit tree Jffi20~90fH
It is particularly preferable to mix 80 to 1 aim% of the polyethylene resin.

In any case, polyolefin resins vary depending on the amount of inorganic filler added later, the type and temperature of the beverages to be sold, etc.
The most suitable one can be selected depending on the container size, depth, shape, molding method, etc. At this time, various polymers and grades, as well as combinations of two or more different polyolefin resins, can be used. There is nothing wrong with that.

Next, various kinds of inorganic fillers can be used as the inorganic filler in the present invention. For example, Merck, clay, calcium carbonate,
Calcium sulfate, magnesium carbonate, barium sulfate, titanium oxide, silica, or a mixture thereof can be used. Particularly suitable is Merck alone or a mixture of Merck and titanium oxide.

The container of the present invention is formed from a resin composition containing the above polio-fin resin and an inorganic filler. Here, the blending ratio of both is 30% polyolefin resin.
-80% by weight, preferably 35-70% by weight and 70-20% by weight of inorganic filler, preferably 65-30% by weight. If the blending ratio of the inorganic filler exceeds 70% by weight, moldability will deteriorate, and if it is less than 20% by weight, rigidity and disposal properties will be poor, which is not preferable. Further, when Merck and titanium oxide are used together, the amount of titanium oxide blended is in the range of 1 to 10% by weight, preferably 2 to 7% by weight based on the resin composition.

In principle, the beverage container for vending machines of the present invention is made from a resin composition consisting of the polyolein resin and inorganic filler as described above, but if necessary, it may be necessary to do so without affecting the physical properties of the beverage container for vending machines. Rubbers such as ethylene-propylene rubber, polyolefins modified with unsaturated carboxylic acids or derivatives thereof, various fillers, and various antioxidants.

Antistatic agents, lubricants, colorants, etc. can also be added.

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 single-screw extruder, or the like.

The beverage container for a vending machine of the present invention is obtained by molding the above-mentioned resin composition into a sheet by differential pressure molding or the like, and then subjecting the opening periphery of the container to a curling treatment. For example, the resin composition is formed into a pellet, and then formed into a sheet using an extrusion molding machine such as a T-Guy type or a calender roll.

The thickness of the sheet may normally be 5 to 1.5 mm.

Next, the obtained sheet is molded by differential pressure molding or the like.

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. According to this molding method, many pieces can be made at once, the molding cycle is short, and continuous mass production is possible. Moreover, a container without seams, wrinkles, or uneven thickness can be easily obtained. Here, differential pressure molding can also be performed continuously after sheet molding without reheating. Here, the angle and shape of the first expanded portion and the second expanded portion can be arbitrarily obtained in the shape of a container according to the present invention by changing the shape of the differential pressure molding die.

Next, the final product is obtained by curling the opening periphery of the container. Note that the shape of the curl is not particularly limited, and may have a sloped portion as shown in FIG. 6(I), or a flat portion at the bottom as shown in FIG. 6(II), and the latter is particularly preferred.

The beverage container of the present invention has the following features. These features will be explained with reference to FIGS. 1 and 2.

First, the first feature is that the first expanding part extends from the bottom of the container to the middle part, and the arc-shaped second part extends from the middle part of the container to the opening.
It was made into an expanded section. Here, the angle of expansion in the first expansion part, that is, the angle of expansion in FIG.
degree, preferably in the range of 4 to 8 degrees. If the angle α is less than 3 degrees, the beverage containers cannot be stacked regularly at the stack height a, and if it exceeds 10 degrees, when a large number of containers (for example, 100 containers) are stacked, the containers will fall over in the lateral direction. , cannot be used as beverage containers for vending machines.

Furthermore, the arc-shaped expansion 1jD of the second expansion part has a rear R of 50~
500WIn% It is preferably expanded in an arc shape of 100 to 250 m, and the expansion difference β between the extension line of the first expanded portion and the end of the second expanded portion at the container opening is preferably 0.6 to 2 mm. must be between 0.5 and 1.5 pharynges. Here radius B
If it is less than 50 folds, the stackability, stability of falling properties, and solidity will decrease due to the influence of heating during the curling process, and if it exceeds 300 folds, the stacking will become more prone to collapse, which is not preferable. Note that the arc shape with radius P does not necessarily have to be in line contact with the extension line of the first expanded portion.

Furthermore, if the expansion β is less than 0.5 mm, the sheets will not fall naturally, while if it exceeds 2 mm, they will not fall easily when stacked, which is not preferable.

In the container of the present invention, the distance from the starting point of the second expanded portion to the opening, that is, the height h of the second expanded portion, is not particularly limited, but is 115 to 315, preferably 115 to 115, of the total height H of the container.
/2.

Since the container of the present invention has the above-described two-stage expanded and open shape, it has good falling and stacking properties, and has the property that it does not easily fall over when stacked.

Furthermore, a second feature of the container of the present invention is that the opening periphery is curled. This is to improve the strength of the opening of the container and improve its characteristics as a beverage container, such as preventing injury to hands and the bottle during use. There is no particular restriction as long as it has been curled, but it can improve strength,
Curl shape is the fifth factor for container breakage and drop resistance.
Figure 3 (I [)
As shown in Figure 2, it is preferable to have a flat part at the bottom.

As described above, the beverage container for vending machines of the present invention may be made of the above-mentioned resin composition as a raw material and have the above-mentioned shape characteristics. An undercut may be provided in the peripheral wall. In this case, the undercut height a) is 6 to 10wIn
degree is preferred.

Further, the width (b) of the ridge formed on the bottom is preferably as small as possible within the moldable range, and is usually 1 to 5 mm, preferably 2 ffiII+ or less.

The beverage container for vending machines of the present invention has a white high-grade paper-like appearance and texture due to the use of talc, and is also water resistant.
It has excellent heat resistance 9 strength and rigidity, and is also easy to dispose of. Furthermore, it has good stacking storage stability and is resistant to falling over. In addition, each container is easily cut and does not fall easily.

As described above, the beverage container for vending machines of the present invention can be effectively used in various hot or cold vending machines.Next, the present invention will be explained in detail with reference to Examples.

Examples 1-4 Polypropylene homopolymer (density 0.91 g-/
ca, melt index (M engineering) o, 62/1o min)
25% by weight, high density polyethylene (density o, 91f/c
rl.

M process 0.4 P/10 minutes) 25% by weight, average particle size 15
46% by weight of talc and 4% by weight of titanium oxide were blended and pelletized using a Banbury mixer, and then a sheet with a thickness of 1817 mm was obtained using an extrusion molding machine. Then,
Pressure 6 kg/crl using a pressure forming machine.

The molding temperature is 160"C, the height is 90mm, the average diameter is 60mm, the average side wall thickness is 0.45inches, and the second expansion part is expanded after R.
−2001111s Expansion difference β between the extension line of the first expanded portion and the end of the second expanded portion in the opening == 11111. The distance (h) from the origin of the second expansion part to the opening
A beverage container was molded with the angle α of the expanded portion set to a predetermined value.

The opening rib portion of the resulting container was curled using a three-roll curling device to obtain a beverage container for a vending machine having a curl in the shape shown in FIG. 3(n).

When 100 containers were stacked, the maximum degree of tip collapse was measured. The results are shown in Table 1.

Furthermore, when this container was subjected to an automatic drop test using a commercially available juice vending machine, it was confirmed that the container dropped without any trouble.

Table 1

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an example of a beverage container for a vending machine according to the present invention, FIG. 2 is a partial sectional view of an example of a beverage container for a vending machine according to the present invention, and FIG. ) and (II) indicate the types of curl shapes. A... Container first expanded portion, B... Container second expanded portion. D...Average diameter, 1 (...height, h...second expansion part height, t...average thickness, a...undercut height, b...formed at the bottom) Protuberance width to be created. α... Angle of the first enlarged part, R... Expansion radius of the second enlarged part, 0... Center point, β... Expansion patent applicant
Idemitsu Petrochemical Co., Ltd. Figure 1

Claims (3)

[Claims] (1) A beverage container for a vending machine, which is formed of a resin composition containing 50 to 80% by weight of a polyolefin resin and 70 to 20% by weight of an inorganic filler, and whose opening periphery is curled, and the bottom of the container From to the middle part is the angle (
α) A first expanded portion of 3 to 10 degrees is formed, and a second expanded portion of an arc shape with a radius (It) of 50 to 50'Om+++ is formed from the middle part of the container to the opening of 4'fM, and the container opening is A beverage container for a vending machine, characterized in that the expansion difference (β) between the extension line of the first expanded portion and the end of the second expanded portion is 0.3 to 2 mm. (2) The container according to claim 1, wherein the length (h) from the starting point of the second expanded portion to the opening is 115 to 315 of the total height (H) of the container. (3) The container according to claim 1, wherein the curled shape of the peripheral edge of the opening has a flat portion at the bottom.