JPH0576445A - Double pipe type expansible straw - Google Patents

Abstract

PURPOSE:To provide a double pipe type expansible straw in which accuracy in size as designed in the extrusion molding is accurately maintained, reliability of products is improved, the amount of usable blank is reduced, cost reduction is achieved and an aluminum foil or the like of a pack can surely be broken through in use. CONSTITUTION:The outside and inside pipes 3, 2 of a double pipe type expansible straw 1 are adapted to have 1.5-3.0/10min of melt flow index, 8,000-12,000kg/cm<2> of modulus of elasticity, satisfactory accuracy in working, high reliability of products, low reduced cost and improved yield. The thickness of the outside and inside pipes is even, the sectional shape is fixed to a perfectly circular one, the extrusion amount is stabilized, the yield of products is improved, low cost is achieved, defective working is not generated and uniform productivity is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the technical field of a straw producing structure made of polypropylene or the like for sucking a beverage such as juice or milk contained in a pack made of paper or the like.

[0002]

2. Description of the Related Art As is well known, as citizens' lives improve and the level of food, clothing and shelter gradually rises, and effective use of leisure time becomes possible, lifestyles will diversify. Life is becoming more and more freely and selectively performed inside and outside the home, and simple food / drink modes based on sufficient health and hygiene management have become widespread due to strong demand and stable mass distribution through the supply side. As snacks and fast foods are becoming more common, drinks such as juice and milk are easily obtained and eaten from vending machines in the form of cans and paper packs. Is becoming.

Of these, unit type beverages are becoming mainstream in paper packs and the like because they are less likely to cause pollution problems associated with disposal after eating and drinking as compared to cans and the like.

[0004] Therefore, it is not preferable from a hygienic point of view to directly drink the beverage such as juice or milk contained in such a pack by opening the pack and opening the mouth, and therefore, Although it is common to take a drink through a straw, it is inconvenient to handle the vending machine and the like to set the pack and the straw separately. Therefore, the straw is attached to the side of the pack. It is well established that the product is attached by means such as material or welding (heating, hot melt) and integrally handled as a unit.

When the straw is welded and integrated on the side surface of the pack, if the length of the straw exposed in the pack is short, it is not only difficult to drink but also Since there is an unpleasant feeling such as the generation of abnormal noise during eating and drinking due to the intrusion of foreign matter or the invasion of air in the front and rear, the straw 1 is attached to the inner straw as in the prior art devised by the applicant shown in FIGS. As shown in FIG. 3, a pipe 2 and an outside constricted straw type straw pipe 3 are inserted into each other to form a double pipe type expansion / contraction type. As shown in FIG. On the diagonal of the side of which can be taken as long as possible or in the vertical direction through a predetermined seal 5 and integrally welded, and at the time of drinking, the double pipe type expansion / contraction straw 1 is peeled off and the inside of the outer pipe 3 is removed. Slide the pipe 2 of Drawer, of the inner pipe 2
The tip opening 6 of the above is pierced into the aluminum foil 8 attached to the suction port 7 formed in one corner of the upper surface of the pack 4, and the straw 1 having a predetermined length is inserted to suck and drink.

During the handling of these pipes, the outer and inner pipes 2 and 3 which are unexpectedly made to have a double length are prevented from contracting and dropping into the pack 4 as shown in FIG. As shown in FIG. 2, a tapered cone-shaped enlarged opening 9 is formed at the base end of the inner pipe 2 and its ring-shaped outer peripheral edge portion is slid into the outer pipe 3 to improve the sealing property. It is possible to avoid the invasion of the atmosphere during drinking, to reliably maintain the negative pressure generation during drinking, and to taper the narrowed portions 10, 10 'on both ends of the outer pipe 3.
In addition, a predetermined tapered diaphragm 10 '' is formed in the middle part to give a stopper function against unexpected slip-out of the outer pipes 2 and 3, and also to prevent the inner pipe 2 from being stretched. A straw having a high degree of perfection, which can sufficiently secure the pressure-bonded seal of the taper cone-shaped expansion opening 9, has been put into practical use.

[0007]

In view of the shape and structure of the double pipe type telescopic straw 1 of this type, the function and the handling function as a beverage sucking tool are certainly satisfied. However, it has been found that the product material has the following problems.

That is, since the members of the outer and inner pipes 2 and 3 are made of synthetic resin, an extrusion molding method is generally used for molding, but as described above, the outer pipe 3 and the inner pipe are used. It is desirable that both 2 and 2 slide relative to each other at the time of drinking, and that their sealing properties must be maintained well, and at the same time, the closed cross sections of both should be perfect circles. It is preferable that accuracy such as uniform wall thickness be maintained.

Further, when the tapered narrowed portions 10 and 10 ′ at both ends of the outer pipe 3 and the tapered cone-shaped expansion ports 9 at both ends of the inner pipe 2 are pressure-molded, at that time as well, It is necessary to perform a precise molding process as designed, and when sucking, remove the straw 1 of the double pipe in the contracted posture from the side of the pack 4 and stretch it, and the tip of the inner pipe 2 If there is not enough waist strength to pierce and break the aluminum foil film 8 of the suction port 7 through the obliquely formed opening 6 of the suction port 7, the straw 1 will be bent or bent and it will be difficult to drink. May be.

In order to deal with this, it is possible to provide a predetermined strength and rigidity by increasing the thickness of the outer and inner pipes 2 and 3, but it goes without saying that the amount of raw materials used is that much. However, there is a problem that the cost increases and the yield decreases.

In the extrusion molding of the outer and inner pipes 2 and 3 and the heat molding of the tapered narrowed portions 10 and 10 'and the tapered cone-shaped widening port 9, a predetermined melt flow index and elastic modulus are obtained. If it is not held, there are problems such as lack of perfect circular accuracy, unstable shape, uneven thickness, and failure to maintain perfect circular shape. There is a disadvantage that the production efficiency decreases due to the decrease.

To solve this, for example, Japanese Patent Laid-Open No. 60-
There are developments by molding techniques such as the invention of JP-B-256414 and the invention of JP-A-62-186815, but there was a point that the above-mentioned problems were not essentially solved.

[0013]

OBJECT OF THE INVENTION The object of the invention of this application is that the double-pipe type telescopic straw based on the above-mentioned prior art has an excellent function in terms of shape, but is superior in strength, rigidity and formability from the viewpoint of material. A technical issue that should be solved is one that has not been fully satisfied, and the shape has sufficient satisfaction with straws that have been completed up to now, but stable in the process of extrusion and processing. Molding is obtained, good precision is maintained, yield is good, economical efficiency is well balanced, sufficient strength and rigidity, elasticity at the time of use, and reliable usability can be maintained. The present invention aims to provide an excellent double pipe type expansion and contraction straw which is beneficial to the field of application of the molding technology in.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the invention of the present application, which is based on the above-mentioned claims and has the above-mentioned object, is made of paper or the like containing a drink such as juice or milk. When using the double pipe type telescopic straw for drinking in a cubic type pack so as to be integrally attached to the side surface or the like in a reduced state, an outer pipe in the production of the double pipe type telescopic straw, Also, the melt flow index of the inner pipe is 1.5 to
3.0 / 10 min, and elastic modulus 8,000-1
It is extruded from a polypropylene material of 2,000 kg / cm ² , so that the amount of extrusion is stable, there is no unevenness in wall thickness, the cross-section roundness is good, and the tapered cone-shaped enlarged opening at one end Also, heat-molding the tapered squeezed parts on both ends of the outer pipe does not cause molding defects, and the oblique opening at the tip of the inner pipe prevents aluminum foil at the suction port of the pack or It has sufficient strength and rigidity when it breaks through the polyethylene film, and elasticity, it prevents the weakness of the waist that causes bending etc. when breaking through, it is possible to reduce the cost with a predetermined thickness, and the outside pipe and inside when drinking When relatively sliding the pipe, the sealing precision of both sides can be slid due to the good molding accuracy, and reliable drinking is achieved, and it is a technical hand that is of good quality, has a good production yield, and can be manufactured at low cost. It is a step.

[0015]

When the outer pipe 3 and the inner pipe 2 are extrusion-molded, if the melt flow index thereof deviates from 1.5 to 3.0 / 10 min, the extrusion amount during extrusion molding will be Instability, unevenness in wall thickness accuracy, oval cross-section and other size and shape defects, resulting in poor product yield and reduced productivity, increasing the amount of raw materials used The melt flow index is 1.5 to 3.0 / 10m due to high cost.
in is the optimum one.

The elastic modulus is 8,000 to 12,
If it deviates from 000 kg / cm ² , there is the disadvantage that the design accuracy cannot be maintained during extrusion molding as well, so the above numerical range is optimized.

Also, when the tapered cone-shaped enlarged opening 9 at the rear end portion of the inner pipe 2 and the tapered squeezed portions 10 and 10 'at both ends of the outer pipe 3 are heated and molded, they are out of the above range of numerical limits. Then, a design defect occurs, the product yield decreases, and stable uniform production cannot be achieved. Therefore, the above numerical limit range is made the best.

As described above, in the double pipe type expansion / contraction straw 1 as a product, the slanted opening 6 at the tip of the inner pipe 2 is, as described above, the aluminum foil of the suction port 7 of the pack 4, polyethylene or the like. At the time of breaking through the film 8 of No. 3, if the melt flow index exceeds 3.0 / 10 min, the film cannot be broken and is bent, and conversely, if it is 1.5 / 10 min or less, it may completely break. Within the range of the above-mentioned numerical limits, it has sufficient rigidity and elasticity and can be pierced reliably.

[0019]

As described above, according to the invention of the present application, basically, a double pipe type expansion / contraction such as fusion-bonding on the side surface of a pack of cubic type such as paper which stores beverages such as juice or milk In order to make the pipes on the outside and inside of the straw made of polypropylene, the polypropylene has a melt flow index of 1.5 to 3.0 / 10 min and an elastic modulus of 8,000 to 12,000 kg / cm ^2.
By this, the extrusion is stable in the extrusion molding process during manufacturing, the roundness accuracy can be maintained as designed, there is no unevenness in the thickness accuracy, a pipe with a uniform and uniform thickness can be obtained, and the product yield is good, The excellent effect that the raw material used can be reduced and the cost can be reduced can be obtained.

Further, in manufacturing, the inner pipe may be bent at an opening portion formed by obliquely providing a sufficient strength, rigidity, and elasticity for breaking through the aluminum foil or the like at the suction port of the pack. In other words, there is an excellent effect that the product can be pierced without fail and the reliability of the product can be sufficiently obtained.

[Brief description of drawings]

 The drawing is an explanatory view of a double-tube type straw.

FIG. 1 is an exploded perspective view of an outer pipe and an inner pipe.

FIG. 2 is a sectional view of a straw.

FIG. 3 is an overall schematic perspective view of a pack and a straw.

[Explanation of symbols]

 1 Double pipe type telescopic straw 2 Inner pipe 3 Outer pipe 4 Pack 7 Suction port

Claims (2)

[Claims] 1. A double-pipe type telescopic straw in which a synthetic resin small-diameter inner pipe is fitted in a synthetic resin small-diameter inner pipe so that at least its end portion is slidably fitted in a sealing manner relative to each other. The melt flow index of both the inner and outer pipes is 1.5 to 3.0 / 10 mi
n and the elastic modulus is 8,000 to 12,000 kg / c
Double-pipe telescopic straw, characterized by being made of polypropylene of m ² . 2. A double-pipe type telescopic straw according to claim 1, wherein the inner and outer pipes are extruded products.