JP2738625B2 - Dispensing tube for bag-in-box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for removing liquid contents from a so-called bag-in-box having a double structure in which a soft inner box made of a flexible film is accommodated in a relatively hard outer box. Related to the output tube.

[0002]

2. Description of the Related Art Such a bag-in-box is used for storing a large amount of drinking water such as juice in a sterilized state in advance, and then supplying or selling the drinking water little by little to a cup or the like. ing.

When taking out the liquid contents from the bag-in-box, as disclosed in Japanese Patent Application Laid-Open No. 2-109895, a long tube-shaped pouring tube is inserted into the bag-in-box. It is provided on one side, and the liquid content is discharged quantitatively by squeezing the pouring tube with a roller pump (perstaltic pump).

[0004] By the way, the spouting tube is required to have appropriate physical properties such as moderate rebound resilience and hardness, and therefore, conventionally, silicone rubber has been generally used. However, the spout tube made of the silicone rubber has problems such as being expensive and having poor heat sealability, and is not always suitable as such a spout tube.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can be manufactured relatively inexpensively, has good heat sealability, and has good abrasion resistance. An object of the present invention is to provide an excellent bag-in-box pouring tube.

[0006]

SUMMARY OF THE INVENTION The present inventors have developed a polymer blend containing polypropylene and ethylene propylene rubber as main components and having a Shore hardness, tear strength and rebound resilience in appropriate ranges. The inventors have found that the above problem can be solved by selecting the above, and have reached the present invention.

That is, the present invention comprises polypropylene and ethylene propylene rubber as main components and has a Shore hardness of 5
2 to 58 degrees, tear strength 18 to 22 kg / cm (JI
SK6301B type), rebound resilience is 55 to 65% (JIS
K630). The present invention provides a bag-in-box pouring tube characterized by being made of a synthetic resin material in the range of K630).

Further, the present invention is directed to a bag-in-box pouring, characterized in that the tube of the pouring tube is further coated with a layer made of polyethylene or polyethylene terephthalate having a thickness of 20 to 100 μm. A tube is provided.

These numerical limitations on shore hardness, tear strength and rebound resilience are appropriate in relation to a roller pump (perstaltic pump) used for pouring contents out of a bag-in-box. It is.

[0010]

The bag-in-box pouring tube having the above-described structure is provided.
Since the rubber is a polymer blend containing polypropylene and ethylene propylene rubber as the main components, it is relatively inexpensive, has good heat sealability, has a suitable rebound resilience, and has no problem in terms of food hygiene. There is no problem, and it has physical properties suitable for dispensing with a roller pump (Perstaltic pump).

Further, the outer peripheral surface of the tube has a thickness of 20 to 10 mm.
By coating a layer made of polyethylene or polyethylene terephthalate of 0 μm, the abrasion resistance of the pouring tube becomes more excellent.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a cross-sectional view of a bag-in-box 1 provided with a pouring tube according to the present invention. A hard outer box, in which a soft inner box 3 made of a flexible film made of a laminate such as polyethylene or polyethylene / PVA is housed.

A spout 4 made of relatively hard polyethylene is projected from the inner box 3 in such a manner that a base flange 4a is fused thereto, and a tip 4b of the spout 4 is formed.
Protrudes outward from the wall surface of the outer box 2.

At the distal end 4b of the spout 4, a base end 5 of a pouring tube 5 having an outer diameter of about 10 mm and an inner diameter of about 7 mm is provided.
a is fused or fitted. The tip 5b of the pouring tube 5 is completely sealed by heat sealing (heat sealing).

The pouring tube 5 contains polypropylene and ethylene propylene rubber as main components, has a Shore hardness of 52 to 58 degrees and a tear strength of 18 to 22 kg / cm (J).
ISK6301B type), rebound resilience 55-65% (JI
SK6301), which is excellent in heat-sealing property and has no problem in terms of food hygiene.

Further, as shown in FIG. 4, the pouring tube 5 has a thickness of 20 to 100 μm on the outer peripheral surface of a tube main body 5c mainly composed of polypropylene and ethylene propylene rubber having the above-mentioned physical properties. Outer layer 5d made of polyethylene or polyethylene terephthalate (a polyethylene layer and a polyethylene terephthalate layer may be laminated within this thickness range) to thereby further protect the pouring tube 5 from abrasion resistance. You may make it more excellent in wearability.

The bag-in-box 1 provided with such a pouring tube 5 is similar to that disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-109895, and has a roller pump (perstaltic pump). The contents are poured out using.

FIG. 2 and FIG. 3 explain the mode. First, as shown in FIG. 2, the discharge tube 5 is connected to the roller 7 of the roller pump 6 and the tube guide 8. Are engaged so as to make a half turn between them, and the distal end thereof is sandwiched between the fixed block 9a and the movable block 9b of the fitting unit 9. At this time, the distal end sealing portion 5b of the pouring tube 5 is held in a state of hanging downward from between the fixed block 9a and the movable block 9b. In the figure,
Reference numeral 10 denotes a tube guide stopper.

Next, the tip sealing portion 5b of the pouring tube 5 is cut, and the tip of the pouring tube 5 is opened to prepare for pouring the contents.

Next, when taking out the contents in the inner box 3, an appropriate container 12 is arranged below the discharge port of the pouring tube 5 as shown in FIG. -It is rotated to the position of the guide stopper 10 and closed.

Further, the movable block 9 of the fitting unit 9
b operates and opens, and the discharge port at the tip of the discharge tube 5 opens.

Next, the roller pump 6 is rotated in the direction of arrow a. As a result, the roller 7 sequentially moves while rotating in the direction of the arrow b due to frictional resistance while crushing the injection tube 5 between the roller 7 and the tube guide 8. For this reason, the food and drink in the discharge tube 5 between one roller 7 and the next roller 7 is extruded so as to be wrung out, and is sequentially discharged from the discharge port at the tip of the discharge tube 5. , Container 12
Poured into.

The spout tube 5 once crushed in this way is immediately restored by its elasticity, and the next food and drink is replenished with this, and is pushed out again by the roller 7 at the rear. .

After the supply of food and drink is completed, the roller pump 6 is stopped, and at the same time, the movable block 9b of the fitting unit 9 is operated, whereby the tip of the pouring tube 5 is clamped and its opening is opened. The part is closed. Next, the tube guide 8 returns from the tube guide stopper 10 to its original position.

(Example 1) Santoprene, 101-5
5 (trade name, manufactured by Nippon Monsanto Co., Ltd., mainly comprising polypropylene and ethylene propylene rubber, having a Shore hardness of 55 degrees and a tear strength of 20 kg / cm (JIS K
6301B type), 61% rebound resilience (JIS K630
1) at a die temperature of 190 ° C. and 4 to 5 m /
Extrusion molding was performed at an extrusion speed of 1 minute to obtain a bag-in-box pouring tube having an outer diameter of about 10 mm and an inner diameter of about 7 mm.
The spout tube is cut to an appropriate length, and the tip is thermally sealed while applying pressure from above and below to completely seal the tube. The base end opening is an inner box of a bag-in-box as shown in FIG. Was thermally fused to a spout (made of polyethylene). Then, after filling the oolong tea in the inner box,
This pouring tube was set on a roller pump (perstaltic pump) as shown in FIG. 3, and oolong tea was poured out.

(Example 2) An outer diameter of about 10 m obtained in Example 1
m, an outer layer made of polyethylene or polyethylene terephthalate was coated on the outer peripheral surface of the bag-in-box pouring tube body having an inner diameter of about 7 mm in a thickness range of 20 to 100 μm. As a method of coating the outer layer, a method of extruding and coating the outer layer simultaneously with the extrusion of the tube body using a two-color extruder, a method of coating such as powder coating, dispersion or solution coating. And a method by plasma polymerization could be used as appropriate.

Next, as in the case of Example 1, the coated spouting tube was cut into a suitable length, and the distal end thereof was heat-sealed while applying pressure from above and below to completely seal it. The part is heat-sealed to the spout (made of polyethylene) of the inner box of the bag-in-box, and after filling the inner box with oolong tea, the spouting tube is placed in FIG.
As shown in (2), the oolong tea was set in a roller pump (Perstaltic pump) and oolong tea was poured out. In addition, it was confirmed that this coating pouring tube was more excellent in abrasion resistance.

[0029]

As described above, according to the present invention, a material that is inexpensive and has good heat sealability as compared with conventional silicone rubber as a pour tube for a bag-in-box. A dispensing tube comprising:
Further, it is possible to satisfy all of the elasticity, heat-sealing property and abrasion resistance required for this kind of pouring tube.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a side view showing an example of use of the bag-in-box pouring tube of the present invention.

FIG. 3 is a side view showing an example of use of the bag-in-box pouring tube of the present invention.

FIG. 4 is a sectional view showing a modification of the bag-in-box pouring tube of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bag in box 1 2 ... Outer box 3 ... Inner box 4 ... Outlet 5 ... Outlet tube 5c ... Tube main body 5d ... Outer layer 6 ... Roller pump 7 ... Roller 8 ... Tube guide 9 Fitting unit 9a Fixed block 9b Movable block 10 Tube guide stopper 11 Container

Claims (2)

(57) [Claims] 1. A main component comprising polypropylene and ethylene propylene rubber, having a Shore hardness of 52 to 58 degrees and a tear strength of 18 to 22 kg / cm (JIS K6301B).
Shape), rebound resilience 55-65% (JIS K6301)
A bag-in-box pouring tube made of a synthetic resin material according to the above item. 2. A thickness of 20 to 100 μm on the outer peripheral surface of the tube.
2. The bag-in-box pouring tube according to claim 1, further comprising a layer made of polyethylene or polyethylene terephthalate.