JP2003290016A - Multiple stage straw and its manufacture method, and beverage product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple stage straw resisting cracking even if used at low temperatures, and capable of easily penetrating lids of various materials without having to increase the sharpness of its tip in excess. <P>SOLUTION: In the multiple stage straw 10 where two or more tubes of different diameters are telescopically combined, the innermost tube 1 is made from a polypropylene type resin composition. Blended with a nucleating agent of 0.08 to 0.25 pts.weight, with a bending modulus of 1,350 to 1,600 MPa and a melt flow rate of 1.0 to 15.0 g/10 min based on 100 pts.weight resin components containing polypropylene resins. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a multi-stage straw for sucking a beverage in a beverage container, a method for manufacturing the same, and a beverage product.

[0002]

2. Description of the Related Art At present, as beverage products, beverage containers filled with beverage in various sizes and shapes made of materials such as paper, plastic, or a composite material thereof are commercially available. In many cases, a straw for sucking a beverage is packaged and attached to a packaging material such as a beverage, and such a straw is made of a synthetic resin in which an inner tube and an outer tube are elastically combined. There is a two-stage straw. Before use, such a two-stage straw has an inner tube housed in an outer tube, and when used, it is stretched and the tip of the inner tube is pierced into the lid of the beverage container for use in drinking. It is like this.

The lid of the beverage container is made of paper, aluminum foil, PET
Various materials such as polyester, saponified ethylene vinyl acetate copolymer, etc. are often laminated and used, and the thickness thereof is also varied. Therefore, the inner tube of the two-stage straw is required to be able to pierce and penetrate the lid made of such various materials. That is, the inner tube is required to have rigidity such that the inner tube is bent at the time of piercing and cannot be pierced, and the hardness such that the tip thereof does not break when the lid is pierced. As a resin used for such an inner tube, for example, Patent Document 1 discloses a propylene homopolymer.

[0004]

[Patent Document 1] Japanese Patent Laid-Open No. 60-256414

[0005]

However, when the inner tube of the conventional two-stage straw is pierced and penetrated through the lid made of various materials, the inner tube is bent without piercing and does not penetrate. Even if it penetrates, the tip may be cracked or chipped. In addition, especially when used in cold regions or when used immediately after taking out from a low temperature environment such as in a refrigerator, when the tip of the inner tube is pierced into the lid of the beverage container, the tip and other parts will crack. In some cases, cracks, chips, etc. occurred.
In particular, the lid using the saponified ethylene vinyl acetate copolymer was hard and the inner tube was difficult to penetrate. In addition, in order to improve the penetrability, it is possible to add talc, which is an inorganic filler, to increase the rigidity, but it is necessary to add a large amount to increase the rigidity, and as a result, deterioration of moldability and coloring However, there is a problem that the deterioration of the appearance is caused by. Further, in order to improve the penetrability, it is considered that the angle of the tip surface of the inner tube is made extremely small to increase the sharpness, but in such a case, a beverage container equipped with a two-stage straw is transported. In addition, the tip of the inner tube may break through the packaging material of the straw and pop out when it is displayed or when it is drunk using such a two-stage straw. There was a problem that there was a lot of left over.

The object of the present invention is to provide a lid made of various materials, even if it is used at a low temperature, without causing cracks or cracks and without excessively increasing the sharpness of the tip. It is an object of the present invention to provide a multi-stage straw that can be easily penetrated, is excellent in moldability and appearance, and has little left over drink.

[0007]

Means for Solving the Problems The inventors of the present invention have made extensive studies in view of the above circumstances, and as a result, by using a multi-stage straw having an innermost tube made of a specific polypropylene resin composition, the above problems can be solved. Find a solution, and also
Furthermore, the inventors have found that it is possible to reduce the amount of leftovers by setting the angle of the tip portion to a specific angle, and have completed the present invention. That is, the multi-stage straw of the present invention is a multi-stage straw in which two or more pipes having different diameters are elastically combined, and the innermost pipe located at the innermost side among the pipes contains a polypropylene resin. With respect to 100 parts by mass of the resin component, 0.08 to 0.25 parts by mass of the nucleating agent is mixed, and the flexural modulus is 1350 to 1600.
Melt flow rate of 1.0 to 15.0 g / MPa
It is characterized by comprising a polypropylene resin composition for 10 minutes. The polypropylene resin is preferably an ethylene-propylene copolymer, and more preferably an ethylene-propylene block copolymer having an ethylene content of 4 to 20% by mass. The nucleating agent is p
-T-Butylbenzoic acid aluminum salt, 1,3,2,4
It is preferably at least one selected from the group consisting of -di- (p-methylbenzylidene) sorbitol and alkali metal benzoate. The tip end surface of the innermost tube is preferably formed at 45 to 65 degrees with respect to the length direction of the innermost tube. The method for producing a multi-stage straw according to the present invention is the method for producing a multi-stage straw in which two or more tubes having different diameters are stretchably combined,
The innermost tube located on the innermost side is 0.08 to 100 parts by mass of the resin component containing the polypropylene resin.
0.25 parts by mass of a nucleating agent is mixed, and the flexural modulus is 135.
At 0 to 1600 MPa, the melt flow rate is 1.0 to
It is characterized by having a step of forming from a polypropylene resin composition of 15.0 g / 10 minutes. The beverage product of the present invention is characterized in that the above-mentioned multistage straw is packaged and attached to a packaging material.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
FIG. 1 shows a two-stage straw 10 which is an embodiment of a multi-stage straw of the present invention, in which an inner pipe 1 and an outer pipe 2 having different diameters are combined in a stretchable manner. In the following description of the present invention, the two-stage straw 10 will be exemplified. In this example, the inner pipe 1 is the innermost pipe located on the innermost side. In the two-stage straw 10 of this example, a first throttle portion 3 and a second throttle portion 4 are formed on both ends of the outer tube 2, and a third throttle portion 3 and a third throttle portion 4 are provided on the tip side between them. The narrowed portion 5 is formed. Further, a stopper portion 6 is formed at the base end portion of the inner pipe 1. Therefore, even if the two-stage straw 10 is stretched during use, the stopper portion 6 is caught by the first throttle portion 3 and the second throttle portion 4 so that the inner pipe 1 does not come off the outer pipe 2 and is stretched once. After being pulled, the stopper portion 6 is caught by the third throttle portion 5 and is not easily contracted. Further, in this example, the distal end surface 7 of the inner pipe is θ = 45 to 6 with respect to the length direction of the inner pipe 1.
It is formed so as to be inclined at 5 °.

The inner tube 1 of the two-stage straw 10 is a polypropylene resin composition in which 0.08 to 0.25 parts by mass of a nucleating agent is mixed with 100 parts by mass of a resin component containing a polypropylene resin. Is molded. Polypropylene resins include ethylene, 1-butene, 1
-Alpha having 2 or 4 to 6 carbon atoms such as hexene
Random copolymer of olefin and propylene (propylene-α-olefin random copolymer), ethylene, 1-butene, 1-hexene or the like having 2 carbon atoms, or 4 to 6 α-olefin, A block copolymer with propylene (propylene-α-olefin block copolymer) or homopolypropylene can be used. These may be used alone or in combination of two or more.

Among these, when an ethylene-propylene copolymer such as an ethylene-propylene random copolymer or ethylene-propylene block copolymer using ethylene as an α-olefin is used, they have a low glass transition temperature. Therefore, even when used in a low temperature environment, an inner tube that is more resistant to cracking can be formed, which is preferable. Furthermore, the ethylene-propylene block copolymer is particularly preferable because the dispersibility of the nucleating agent is excellent.

The content of α-olefin in the propylene-α-olefin random copolymer is 2 to 8% by mass.
Is preferable and 3-6 mass% is more preferable. On the other hand, the content of α-olefin in the propylene-α-olefin block copolymer is preferably 4 to 20% by mass, and 4 to 15% by mass.
Mass% is more preferable.

The resin component may contain a resin other than the above-mentioned polypropylene resin, and examples of such a resin include polystyrene, polyvinyl alcohol (Poval), saponified ethylene vinyl acetate copolymer and the like. it can. When a resin other than these polypropylene resins is used, polystyrene is preferred because of its high rigidity. However, the polypropylene-based resin composition preferably contains the above-mentioned polypropylene-based resin as a main component, and when a resin other than the polypropylene-based resin is used, the compounding amount thereof is 100% by weight.
The amount is preferably 15 parts by mass or less with respect to parts by mass, and more preferably 2 to 8 parts by mass.

The nucleating agent contained in the polypropylene resin composition is not particularly limited as long as it acts as a nucleating agent for increasing the rigidity of the polypropylene resin composition,
Examples thereof include alkali metal salts, alkaline earth metal salts or group III and IV metal salts of monocarboxylic acids or dicarboxylic acids; dibenzylidene sorbitol derivatives and the like. Among these, specifically, p-t-butylbenzoic acid aluminum salt, 1,3,2,4-di- (p-
Alkali metal benzoates such as methylbenzylidene) sorbitol and sodium benzoate are preferred, and aluminum pt-butyl benzoate is preferred from the standpoint of increasing the rigidity of the polypropylene resin composition obtained by addition in a small amount.

The content of the nucleating agent is 0.08 to 100 parts by mass of the resin component containing the polypropylene resin.
0.25 parts by mass, preferably 0.08 to 0.20
Parts by mass. When the blending amount is less than 0.08 parts by mass, the rigidity of the polypropylene resin composition is insufficient. On the other hand, when the amount exceeds 0.25 parts by mass, the moldability decreases, extrusion molding becomes difficult, and the resistance between the outer tube 2 and the inner tube 1 increases when the two-stage straw 10 is expanded or contracted. Sliding property is reduced, making it difficult to use.

Further, the polypropylene resin composition contains additives such as an antioxidant, an inorganic filler, and a coloring agent for enhancing the design, as long as the object of the present invention is not impaired. Good.

Further, the polypropylene resin composition has a flexural modulus of 1350 to 1600 MPa,
Melt flow rate (MFR) according to JIS K7210 (230 ° C, load 21.18N) is 1.0 to 15.0
g / 10 min is used. Flexural modulus 1350
When the pressure is less than MPa, when the tip of the inner tube 1 formed of such a polypropylene resin composition is pierced into the lid of the beverage container, the inner tube 1 is bent and often does not penetrate. On the other hand, when the pressure exceeds 1600 MPa, the inner tube 1 formed from such a polypropylene resin composition
The two-stage straw 10 having the above-mentioned tendency tends to have a reduced slidability during expansion and contraction and a reduced formability.

The melt flow rate is 1.0 g / 1.
When it is less than 0 minutes, the moldability is insufficient and it becomes difficult to perform extrusion molding. On the other hand, when it exceeds 15.0 g / 10 minutes, the roundness of the cross section of the inner tube 1 obtained by extrusion molding deteriorates, and it is difficult to insert the inner tube 1 into the outer tube 2 during the production of the two-stage straw 10. Become. For example, if the circularity (= a / b) obtained from the lengths of the major axis a and the minor axis b shown in FIG. 3 exceeds 1.1, the step of inserting the inner tube 1 into the outer tube 2 may be hindered. It may come.

On the other hand, the resin used for molding the outer tube 2 of the two-stage straw 10 is not particularly limited, and a polypropylene resin composition, polystyrene or the like can be used. It is preferable to use a coalesce because it has a good mouth feel at the time of use. Further, the resin forming the outer tube 2 may be mixed with additives such as a colorant, an antioxidant and an inorganic filler.

The angle of the tip surface 7 of the inner tube 1 is preferably 45 to 65 ° with respect to the length direction. If the angle is less than 45 °, cracking or chipping of the tip portion is likely to occur, and the tip of the inner tube 1 is covered with a straw when the beverage container equipped with the two-stage straw 10 is transported or displayed. There is a possibility of breaking through the material and jumping out. In addition, it becomes difficult to suck the beverage to the end, and there is a tendency that the amount of the beverage left behind increases. On the other hand, if it exceeds 65 °, it tends to be difficult to pierce the lid. In addition, when the above polypropylene-based resin composition is used, the extrudability is excellent, and it is easy to cut the tube obtained by the extrusion molding.
Easy to form in the range of 5 °. More preferably, 48-6
It is 0 °.

Next, a method of manufacturing the two-stage straw 10 of this example will be described. First, the above predetermined components are mixed with a mixing machine such as a mixing roll, a Banbury mixer, a Henschel, a tumbler, and a ribbon blender,
A polypropylene resin composition for forming an inner pipe is prepared.
Then, an inner pipe 1 having a predetermined length is formed from the polypropylene resin composition by using a pipe forming device such as an extrusion molding machine.
To mold. On the other hand, the outer tube 2 having a predetermined length is similarly molded from an appropriately prepared outer tube molding material. And
For the inner tube 1, the stopper portion 6 shown in FIG. 1 is formed,
On the other hand, for the outer tube 2, the first throttle portion 3 and the third throttle portion 5 are formed. Then, after inserting the inner tube 1 into the outer tube 2,
A second narrowed portion 4 is formed on the outer tube 2 to produce a two-stage straw 10 in which the inner tube 1 does not come out of the outer tube 2 when stretched and does not easily shrink after stretching. it can.

In the above description, the two-stage straw 10 is described as an example of the multi-stage straw, but the multi-stage straw of the present invention may have three or more stages, and the innermost innermost There is no particular limitation as long as the tube is made of the polypropylene resin composition described above.

According to such a multi-stage straw, the innermost tube has a resin component 100 containing a polypropylene resin.
Polypropylene resin composition in which 0.08 to 0.25 parts by mass of a nucleating agent is blended with respect to parts by mass, the flexural modulus is 1350 to 1600 MPa, and the melt flow rate is 1.0 to 15.0 g / 10 min. Since it is made of a material, even if it pierces a hard lid such as a saponified product of ethylene vinyl acetate copolymer in a low temperature environment, it does not bend, crack, or chip, and is easy. Can be penetrated. Therefore, it is possible to provide an excellent multi-stage straw that does not need to excessively increase the sharpness of the tip and does not stick out from the packaging material when left undrinked or during transportation. Furthermore, since this polypropylene resin is also excellent in moldability, it is possible to efficiently mold a multi-stage straw having excellent performance with good moldability.

When an ethylene-propylene copolymer such as an ethylene-propylene random copolymer or an ethylene-propylene block copolymer is used as the polypropylene resin, the inner pipe 1 which is less likely to break even when used at low temperatures Are preferable because they can be formed. Further, it is particularly preferable to use an ethylene-propylene block copolymer having an ethylene content of 4 to 20% by mass because the dispersibility of the nucleating agent is excellent and the rigidity of the polypropylene resin composition can be efficiently increased.

[0024]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples. The methods for measuring physical properties are shown below. (1) Impact crack Immediately after being left at a predetermined temperature for 24 hours or more (within 10 seconds), it was placed on a pedestal using a DuPont impact tester (manufactured by Toyo Seiki) at a measurement atmosphere temperature of 23 ° C. An iron plate having a thickness of about 3 mm was placed on the straw, a weight of 200 g was dropped from a height of 50 cm, and the presence or absence of breakage of the straw was visually observed. Such an impact test was performed 10 times, and the number of cracks was measured. (2) Rigidity (flexural modulus) The flexural modulus was measured according to JIS K 6758. (3) Moldability Using the extruder 20 equipped with the cooling device 30 as shown in FIG. 2, continuous molding was performed for 12 hours. Meanwhile, extruder 2
Tubular molten resin 4 from 0 to the cooling device 30
The number of times 0 was cut was measured. (4) Roundness As shown in FIG. 3, the lengths of the major axis a and the minor axis b of the cross section of the extruded product are measured with a dial gauge, and the roundness = a / b
I asked. That is, for a perfect circle, roundness = 1
The closer to 1, the higher the roundness. If the roundness exceeds 1.1, the step of inserting the inner tube into the outer tube may be hindered in the two-stage straw molding. (5) Film penetration As shown in FIG. 4, high density polyethylene (density 0.958
g / cm ³ ), a non-stretched (cp) film 50 having a width W of ³⁰ cm and a thickness of 60 μm is prepared.
Was laid over two support bars 60, 60 arranged in parallel with each other. The distance L between the support bars 60, 60 was 30 cm. At this time, the lengthwise direction of the support rods 60, 60 and the lengthwise direction of the film 50 were made perpendicular to each other. Then, at both ends of the film 50 in the length direction,
An extruded product for an inner tube of a two-stage straw in which a tension is applied to the film 50 by applying a load of g, and the angle of the front end surface is formed at 60 ° with respect to the film 50 in this tensioned state. 70 was pierced vertically and an attempt was made to penetrate. The speed (penetration speed) when piercing the extruded product 70 is 10 m / m.
The in-pushing depth was 50 mm. The test was performed on 10 extruded products 70. For example, when 10 out of 10 penetrated, it was described as “10/10” in Tables 2 and 4, and 1 out of 10 penetrated. If, Table 2 and Table 4
It was described as "1/10".

In the examples, the abbreviations represent the following resins. PP1; polypropylene resin BLPP1; propylene-ethylene block copolymer BLPP2 having an ethylene content of 8 mass%; propylene-ethylene block copolymer BLPP3 having an ethylene content of 2 mass%; propylene having an ethylene content of 25 mass%
Ethylene block copolymer BLPP4; Propylene-ethylene block copolymer BLPP5 having an ethylene content of 8 mass%; Propylene-ethylene block copolymer having an ethylene content of 8 mass%

[Experimental Example 1] The rigidity test (flexural modulus) and the impact cracking test were conducted on the extruded products for the inner tube of the two-stage straws manufactured in the following Example 1 and Comparative Example 1. The results are shown in Table 1. (Example 1) A polypropylene resin composition (MFR 8.0) obtained by adding 0.15 parts by mass of pt-butylaluminum benzoate as a nucleating agent to 100 parts by mass of BLPP1.
g / 10 minutes) is extruded using a 40 mm extruder at a die temperature of 210 ° C., a cooling water temperature of 45 ° C., and an extrusion speed of 60 m / min to obtain a wall thickness of 0.25 mm and an outer diameter of 3.8 mm.
An extruded product for a two-stage straw inner tube having a length of 68 mm was obtained. (Comparative Example 1) PP1 (MFR without addition of a nucleating agent)
Extruded products for inner tubes of two-stage straws were obtained in the same manner as in Example 1 except that 8.0 g / 10 min) was used.

[0027]

[Table 1]

The extruded product of Comparative Example 1, which was made of a resin containing no nucleating agent, was fragile.

[Experimental Example 2] The film penetration test and the rigidity test (flexural modulus) of the extruded product for the inner tube of the two-stage straw produced in the following Example 2, Comparative Example 2 and Comparative Example 3 were conducted. went. The results are shown in Table 2. (Example 2) A polypropylene resin composition (MFR 8.0) in which 100 parts by mass of BLPP2 was added with 0.15 parts by mass of pt-butyl aluminum benzoate as a nucleating agent.
(g / 10 min) except that 2 was used in the same manner as in Experimental Example 1.
An extruded product for the inner tube of the stepped straw was obtained. (Comparative Example 2) A polypropylene resin composition (MFR 8.0) obtained by adding 0.15 parts by mass of pt-butylaluminum benzoate as a nucleating agent to 100 parts by mass of BLPP3.
(g / 10 min) except that 2 was used in the same manner as in Experimental Example 1.
An extruded product for the inner tube of the stepped straw was obtained. (Comparative Example 3) An experiment was conducted except that 100 parts by mass of BLPP1 was replaced with a polypropylene resin composition (MFR 8.0 g / 10 min) in which 0.25 parts by mass of an inorganic filler talc was added in place of the nucleating agent. In the same manner as in Example 1, an extruded product for an inner tube of a two-stage straw was obtained.

[0030]

[Table 2]

From the results shown in Table 2, in the extrusion-molded article of Example 2 in which a propylene-ethylene block copolymer having an ethylene content of 2 mass% was used as the polypropylene resin, the container lid was pierced and penetrated. Extrusion of Comparative Example 2 having sufficient rigidity but using a propylene-ethylene block copolymer having an ethylene content of 25 mass% as a polypropylene resin and Comparative Example 3 in which talc was added instead of the nucleating agent. It was suggested that the molded product had insufficient rigidity, and there was a problem in piercing and penetrating the lid of the container.

[Experimental Example 3] An impact cracking test and a rigidity test (extruded product) for the inner tube of the two-stage straw produced in Comparative Examples 4 and 5 and Example 1 and Comparative Example 1 described below were conducted. Flexural modulus), moldability, and roundness were evaluated.
The results are shown in Table 3. (Comparative Example 4) A polypropylene resin composition (MFR 0.7) in which 100 parts by mass of BLPP4 was added with 0.15 parts by mass of p-t-butylbenzoic acid aluminum salt as a nucleating agent.
(g / 10 min) except that 2 was used in the same manner as in Experimental Example 1.
An extruded product for a tube with a stepped straw was obtained. (Comparative Example 5) A polypropylene resin composition (MFR 17 g) in which 100 parts by mass of BLPP5 was added with 0.15 parts by mass of pt-butyl aluminum benzoate as a nucleating agent.
/ 10 minutes) was used, and an extruded product for a two-stage straw inner tube was obtained in the same manner as in Experimental Example 1.

[0033]

[Table 3]

During the extrusion molding, when the polypropylene resin composition of Comparative Example 4 was used, during the moldability test, the tubular melt shown by reference numeral 40 in FIG. 2 exited from the extruder 20 and before entering the cooling device 30. The resin was easily broken and molding was difficult.
On the other hand, when the polypropylene resin composition of Comparative Example 5 was used, the continuous moldability was good, but the roundness was extremely poor, and the cross section was crushed. Using this extrusion molded product as an inner pipe, It was in a state where it could not be inserted into the outer tube. On the other hand, the extrusion-molded product obtained in Example 1 has
The roundness was excellent.

[Experimental Example 4] An impact cracking test, a rigidity test (flexural modulus), and an extruded product for a two-stage straw inner tube produced in the following Comparative Examples 6 and 7 and Example 1 described above, The moldability and the film penetrability were evaluated. The results are shown in Table 4. (Comparative Example 6) An extruded product for a two-stage straw inner tube was obtained in the same manner as in Example 1 except that the amount of the nucleating agent added to 100 parts by mass of BLPP1 was changed to 0.05 parts by mass. The polypropylene resin composition has an MFR of 8.0 g /
It was 10 minutes. (Comparative Example 7) An extruded product for a two-stage straw inner tube was obtained in the same manner as in Example 1 except that the amount of the nucleating agent added to 100 parts by mass of BLPP1 was 0.30 parts by mass. In addition,
The polypropylene resin composition has an MFR of 8.0 g / 10
It was a minute.

[0036]

[Table 4]

From the results shown in Table 4, the extrusion molded article of Comparative Example 6 in which the nucleating agent is 0.05 part by mass has insufficient rigidity, and there is a problem in piercing and penetrating the lid of the container. Also,
The extruded product of Comparative Example 7 containing 0.30 parts by mass of the nucleating agent had sufficient rigidity, but had very poor moldability.

[Experimental Example 5] The impact cracking test, the rigidity test (flexural modulus), and the moldability of the extruded products for the inner tube of the two-stage straws manufactured in the following Examples 3 to 5 were evaluated. . The results are shown in Table 5. (Example 3) Example 1 except that a polypropylene resin composition (MFR 8.0 g / 10 min) in which 0.08 parts by mass of sodium benzoate was added as a nucleating agent to 100 parts by mass of BLPP1 was used. In the same manner as above, an extruded product for an inner tube of a two-stage straw was obtained. (Example 4) Example 1 except that a polypropylene-based resin composition (MFR 8.0 g / 10 min) obtained by adding 0.15 parts by mass of sodium benzoate as a nucleating agent to 100 parts by mass of BLPP1 was used. In the same manner as above, an extruded product for an inner tube of a two-stage straw was obtained. (Example 5) Example 1 except that a polypropylene resin composition (MFR 8.0 g / 10 min) obtained by adding 0.20 parts by mass of sodium benzoate as a nucleating agent to 100 parts by mass of BLPP1 was used. In the same manner as above, an extruded product for an inner tube of a two-stage straw was obtained.

[0039]

[Table 5]

100% benzoic acid sodium salt was used as a nucleating agent.
When blended in the range of 0.08 to 0.20 parts by mass with respect to parts by mass of BLPP1, all of the synthesis, impact cracking and moldability were excellent.

[Experimental Example 6] (Example 6) Using the extruded product produced in Example 1 as an inner tube, a two-stage type straw having a 45 ° front end surface of the inner tube was produced. 10 test subjects, P on paper pack
We handed each of the milk packs containing 200 mL of milk to the container with the E-film lid, and asked them to poke the lid with the manufactured two-stage straw, and everyone could easily put the lid on with the straw. I was able to penetrate. Moreover, when each of them drank milk, the average amount of the left over drink was 0.1% or less of the volume. (Example 7) Using the extruded product produced in Example 1 as an inner tube, a two-stage straw having a tip surface of the inner tube formed at 70 ° was produced. 10 test subjects, P on paper pack
Each of the milk packs containing 200 mL of milk was handed over to the container formed with the E-film type lid, and the two-stage straws produced had the lids pierced, and 8 out of 10 people covered the straws. I was able to penetrate the part.
Also, when each of them drank milk, there was almost no leftover drink.

[0042]

As described above, in the multi-stage straw of the present invention, the innermost tube contains 0.08 to 0.25 part by mass of the nucleating agent with respect to 100 parts by mass of the resin component containing the polypropylene resin. Is mixed, and the flexural modulus is 1350 to 1600.
Melt flow rate of 1.0 to 15.0 g / MPa
Since it is composed of a polypropylene resin composition for 10 minutes, even if it pierces a hard lid such as a saponified product of an ethylene vinyl acetate copolymer in a low temperature environment, it bends, cracks, It can be easily penetrated without chipping. Therefore, it is possible to provide an excellent multi-stage straw that does not need to excessively increase the sharpness of the tip and does not stick out from the packaging material when left undrinked or during transportation. Furthermore, since this polypropylene-based resin composition is also excellent in moldability, it is possible to efficiently mold a multi-stage straw having excellent performance with good moldability.

[Brief description of drawings]

FIG. 1 is a form of a multi-stage straw of the present invention,
(A) A cross-sectional view showing a state in which the inner pipe is housed in the outer pipe,
(B) It is sectional drawing which shows the extended state.

FIG. 2 is a schematic configuration diagram of an extruder equipped with a cooling device used in Examples.

FIG. 3 is an explanatory diagram illustrating circularity of a tube.

FIG. 4 is a perspective view illustrating a method of evaluating film penetrability.

[Explanation of symbols]

1 ... Inner tube (innermost tube) 2 ... 2-stage straw (multi-stage straw)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Minoru Koyama             1-9-10 Nihonbashi Horidome-cho, Chuo-ku, Tokyo               Showa Denko Plastic Products Stock Association             In-house (72) Inventor Katsumasa Hoshi             3073 Hashido, Hasuda City, Saitama Prefecture F-term (reference) 3B115 AA02 AA22 BA18 DA09                 3E067 AA03 AB26 BA06A BA07A                       BB01A BB12A BB14A BC03A                       BC07A EB15 EB25 EB30                       EB32 EB33 EE24                 4J002 BB111 BB121 BB141 BB151                       BP021 EG076 EL106 FD206                       GG00

Claims (7)

[Claims] 1. A multi-stage straw in which two or more pipes having different diameters are stretchably combined with each other, wherein the innermost pipe located at the innermost side of the pipes is 100 parts by mass of a resin component containing a polypropylene resin. Polypropylene resin composition in which 0.08 to 0.25 part by mass of a nucleating agent is blended, the flexural modulus is 1350 to 1600 MPa, and the melt flow rate is 1.0 to 15.0 g / 10 min. A multi-stage straw characterized by consisting of. 2. The polypropylene-based resin is an ethylene-propylene copolymer.
The multi-stage straw described in. 3. The ethylene-propylene copolymer is
The multi-stage straw according to claim 2, which is an ethylene-propylene block copolymer having an ethylene content of 4 to 20% by mass. 4. The nucleating agent is selected from the group consisting of aluminum p-t-butylbenzoate, 1,3,2,4-di- (p-methylbenzylidene) sorbitol and alkali metal benzoate. The multi-stage straw according to claim 1, wherein the straw is at least one kind. 5. The tip end surface of the innermost tube is formed at 45 to 65 degrees with respect to the lengthwise direction of the innermost tube. Multi-stage straw. 6. A method for producing a multi-stage straw in which two or more pipes having different diameters are stretchably combined with each other, wherein the innermost pipe of the pipes is a resin containing a polypropylene resin. 0.08 to 0.25 part by mass of a nucleating agent is mixed with 100 parts by mass of the component, the flexural modulus is 1350 to 1600 MPa, and the melt flow rate is 1.0 to 15.0 g / 10 min polypropylene system. A method for producing a multi-stage straw, comprising the step of forming from a resin composition. 7. A beverage product, wherein the multi-stage straw according to any one of claims 1 to 5 is packaged and attached to a packaging material.