JP2001247133A - Pouch for refill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refill pouch which reduces the tearing force in an unsealing operation, reduces the deviation between face and back sides in the tearing direction, and has the excellent environment-resistant stress cracking property. SOLUTION: This refill pouch is formed of a laminate film with an innermost layer in contact with a content c. being a film layer a. which is formed of a blend of, by weight, >=10% to <=90% linear low-density polyethylene and one or two kinds selected among >=10% to <=90% low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, ionomer, polypropylene, ethylene-butene-1-copolymer, and an outermost layer as a film layer b. a nylon film or a PET film layer with an angle of molecular orientation of 0 to 22.5 deg., and includes a pouch having a spout portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a refillable detergent,
It is related to pouches containing bleach and softeners,
More particularly, the present invention relates to a refill pouch which is easy to open when tearing open with fingers, has no misalignment between the front and back sides, and has good environmental stress cracking resistance.

[0002]

2. Description of the Related Art An easily openable bag is disclosed in Japanese Patent Application Laid-Open No. 61-604.
Japanese Patent Application Laid-Open No. 69-142159 and Japanese Patent Application Laid-Open No. Sho 61-142159 disclose a method in which a plurality of flaws or holes are provided on a fusion-bonded portion of a bag that has been thermally fused on three sides or on the outside thereof. These bags can be opened with a small opening force at the time of tear-opening, but when the tear-opening exceeds the fusion part of the bag, that is, when the tearing line reaches the contents side of the bag, the tearing direction is changed. There was a drawback that there was a shift between the front and back. Japanese Patent Application Laid-Open No. Hei 5-221453 discloses that a heat-sealing portion of a bag formed of a laminate film comprising a biaxially stretched film layer and a sealant layer is provided with a plurality of tear-inducing flaws, and a heat-sealing portion provided with the tear-inducing flaws. Describes a bag in which the angle of intersection between the edge of or the line parallel thereto and the molecular orientation line of the biaxially stretched film is 15 degrees or less. This bag also requires a large opening force at the time of opening, and has a drawback that the tearing direction is shifted between the front and back of the bag.

[0003]

SUMMARY OF THE INVENTION The present invention provides a pouch for refilling which reduces the tearing force at the time of opening, reduces the deviation between the front and back in the tearing direction, and has good environmental stress cracking resistance.

[0004]

According to the present invention, there are provided: 1.a. a linear low-density polyethylene of 10% to 90% by weight and a low-density polyethylene of 10% to 90% by weight; A film layer formed of a blend of one or more selected from high-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, ionomer, polypropylene, and ethylene-butene-1 copolymer, and b. A refillable pouch formed by laminating a nylon film or a PET film layer of 0 to 22.5 degrees with a c., An innermost layer which is in contact with the contents as a film layer, and an outermost layer as a b. 2. A spout is formed on the upper shoulder of the refill pouch so as to be inclined in the direction of 25 to 60 degrees. 2. The pouch for refilling according to item 1, wherein the tear guiding line is arranged to cross the mouth 3. The pouch for refilling according to item 2, wherein the tearing guiding line is formed by laser processing. 2. The refill pouch according to item 2 or 3, wherein the depth of the guide wire is applied to the outermost biaxially stretched film layer and does not reach the innermost layer in contact with the contents.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bag using a biaxially stretched film requires a large force for tearing, and there is a problem that the tearing direction is shifted between the front and back of the bag. In particular, the refill pouch containing the contents is provided with a spout to facilitate pouring, but when refilling it requires a large force to tear the spout and form a spout. It is difficult to use, and there is a problem that if the tearing direction is shifted on the front and back of the spout, the contents flow out in an unexpected direction. The present inventor has studied why such a problem occurs, and found that there is a problem in the molecular orientation of the pouch using the biaxially stretched film. The biaxially stretched film is stretched and oriented in the biaxial direction of the length direction and the width direction, but near the center in the width direction of the film, the orientation in the length direction is large, and as it approaches the both ends of the width,
The orientation in the direction of 45 degrees increases toward the end with respect to the longitudinal axis. Normally, a pouch is formed by stacking and folding two laminate films each having a heat seal layer laminated on the biaxially stretched film, and heat-sealing the periphery of the laminate film, but in the vicinity of both ends of the width of the biaxially stretched film. When a laminate film using a nearby film is overlaid to form a pouch, the molecular orientations of the front and back cross at 90 degrees. As described above, when the crossing angle θ between the front and back molecular orientation directions becomes large, the dispersion of the tearing force at the time of tear opening becomes large, and the tearing becomes difficult.

[0006] The present invention is intended to avoid the distribution of tearing forces.
The molecular orientation angle in the length direction of the biaxially stretched film as the base material was in the range of 0 to 22.5 degrees, and preferably in the range of 0 to 15 degrees. The film with this molecular orientation angle is a film near the center of the width of the biaxially stretched film, and is a portion where the molecular orientation in the length direction is large. Propagation is also good. The standard of the molecular orientation angle is such that the axis in the film length direction is 0 degree.
It is specified as a degree. If the molecular orientation angle of the biaxially stretched film of the outermost layer is 0 °, the crossing angle θ of the molecular orientation when the films are stacked is 0 °, which is the most preferable. If it is 22.5 degrees, the crossing angle θ of the orientation is 45 degrees. The crossing angle θ of the molecular orientation is 4
If the angle is more than 5 degrees, the dispersion of the tearing force becomes large, and it becomes difficult to tear open. Moreover, the difference in tearing between the front and back surfaces increases, which is not preferable because it causes a practical problem. The biaxially stretched film used in the present invention is nylon 6, nylon 66,
Polyamides such as para- or meta-xylylene adipamide; polyesters such as polyethylene terephthalate (PET), polytetramethylene terephthalate and polyethylene naphthalate; and polyolefins such as polypropylene.

According to the present invention, in order to further reduce the tearing force, 10% by weight or more and 90% by weight or less of linear low-density polyethylene (LLDPE) and 10% by weight or more are added to the outermost biaxially stretched film as the innermost layer. 90% by weight or less selected from low-density polyethylene (referred to as LDPE), medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer (referred to as EVA), ionomer, polypropylene, ethylene-butene-1 copolymer or A film in which two or more blended films were added to form a pouch. By making the film of such a composition, the tear-opening property is further improved,
Environmental stress cracking resistance is improved for contents such as detergents, bleaching agents, and softeners. The package causes stress cracking due to the storage environment, and the package is easily broken.
Therefore, environmental stress cracking resistance (ESC)
Need to be larger.

The laminated film constituting the pouch is:
Wet lamination method, dry lamination method,
It can be produced by an ordinary method such as an extrusion lamination method and a co-extrusion lamination method. If necessary, each film constituting the laminated film may be pre-treated by corona treatment, ozone treatment, or the like, or may be laminated with an anchor coating agent, an adhesive, or the like. Depending on the properties of the contents, a gas barrier material such as an aluminum foil or an ethylene-vinyl alcohol copolymer may be provided between the outermost layer and the innermost layer.

The present invention further encompasses a pouch provided with a tearing guide line formed by laser processing at the spout to maintain the tearing direction. The tearing guide line by laser processing may be placed on the outermost biaxially stretched film.When the tearing guide line reaches the innermost layer, a pinhole is generated in the laser processing part due to drop impact, vibration during transportation, etc. This is not preferable because the strength of the material itself is reduced. It is preferable that the spout is provided on the upper shoulder of the pouch, because the spout can be easily poured into the container at the time of refilling. In particular, it is preferable to install in the direction of 45 degrees because it is easy to inject the container.

[0010]

Next, the present invention will be described specifically with reference to examples. Example 1 As shown in FIG. 1, a biaxially stretched nylon film having a thickness of 15 μm and a molecular orientation angle of 5.5 degrees was used for the outermost layer 2, and 80% by weight of LLDPE having a thickness of 130 μm and LDP were used for the innermost layer 3.
E Using a laminate film 1 in which a 20% by weight blend film is laminated via an adhesive layer 4 by a dry lamination method, two laminate films are overlapped so that a nylon film is the outermost layer, and a pouch is further formed. A film having the same layer structure folded in an inverted V-shape is sandwiched between the front and back laminate films at a position corresponding to the bottom of the pouch so that a spout 8 protruding in the direction of 30 degrees is formed on the upper shoulder of the pouch. The peripheral end was heat-sealed to produce a standing pouch 5 having a length of 260 mm, a width of 120 mm and a bottom folding width of 33 mm as shown in FIG. Further, a tearing guide wire 9 was formed in the spout 8 by laser processing. The flow direction of the biaxially stretched film is
In the case of the pouch shown in FIG. 1, the direction is parallel to the short side of the pouch. 2 in FIG. 2 indicates the molecular orientation direction of the front film,
7 indicates the molecular orientation direction of the backside film, and θ is the molecular orientation crossing angle. The molecular orientation angle of the biaxially stretched nylon film can be determined by measuring birefringence with a polarizing microscope. That is, the extinction position of the film (the position where the film becomes black) is obtained in a state where the polarization directions obtained by the polarizer and the analyzer by the polarizing microscope are orthogonal to each other (orthogonal Nicols). This angle is the molecular orientation angle of the film. Table 1 shows the performance and configuration.

Examples 2 to 10 Pouches were prepared in the same manner as in Example 1 except that the structure was changed as shown in Table 1. Performance and configuration are shown in Table 1. Comparative Examples 1 to 7 Pouches were made in the same manner as in Example 1 except that the configuration was changed as shown in Table 1. Table 1 shows the performance and configuration.

Comparative Example 1 is an example in which the molecular orientation angle of the outermost layer film is out of the range of the present invention, and has a poor opening property and a large gap between front and back. Comparative Example 2 is an example in which the tear line by the laser processing reached the innermost layer, and the innermost layer was elongated at the time of opening, and the opening property was poor. Comparative Example 3 is an example in which laser processing is not performed, and has poor openability and a large gap between the front and back sides. Comparative Examples 4 and 5
Is an example in which the innermost layer is formed only of LLDPE, and the openability is poor. Comparative Examples 6 and 7 were examples in which the amount of LLDPE was out of the range, and the front-to-back deviation was large, and the environmental stress cracking (ESC) was poor.

Comparative Test Test 1 Opening Test A tear was opened by hand along the tearing guide line formed at the spout, and the ease of tear opening and the displacement of the front and back of the pouch were examined. Table 1 shows the results. In the table, 〇 in the column of openability indicates that tear-opening is easy, X indicates that tear-opening is difficult, and XX indicates that tear-opening is not possible. In the table, "O" in the column of deviation indicates that there is no deviation, and "X" indicates that there is deviation. Test 2 500 pieces of kitchen detergent (more made by Kao Corporation) on pouches for environmental stress cracking
g, and stored under storage conditions of 50 ° C. for 2 weeks, and observed for leakage of contents. In Table 1, in the ESC column, ○ indicates that there was no leakage, and X indicates that leakage occurred.

[0014]

[Table 1]

(Note) * 1: Random PP. * 2: Ethylene-butene-1 copolymer.

[0016]

According to the present invention, the pouch has an excellent effect that a small slippage between the front and back of the pouch is small, a small tearing force is obtained, a stable easy-opening property is obtained, and a good environmental stress cracking resistance is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing one example of a layer structure of a laminate film forming a refill pouch of the present invention.

FIG. 2 is an explanatory view showing one example of a refill pouch of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminate film 2 Outermost layer 3 Innermost layer 4 Adhesive layer 5 Refill pouch 6 Molecular orientation direction of front side laminate film 7 Molecular orientation direction of back side laminate film 8 Spout 9 Tearing guide line

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 75/60 B65D 75/60 F-term (Reference) 3E064 AB23 BA27 BA28 BA30 BA36 BA46 BA54 BA55 BA60 BB03 BC20 EA23 FA04 FA05 GA01 HM01 HN06 HP01 HP05 3E067 AA03 AB96 BA14A BB14A BB15A BB16A BB25A BC03A CA16 CA30 EA06 EB02 EB25 FA01 FC01 GD10 4F100 AK05A AK06A AK07A AK42B AK48B20 AK63A AK65A AK63A AK65A AK63A AK65A AK63A AK65A

Claims (4)

[Claims] 1. A method comprising: a. 10% by weight or more and 90% by weight or less of linear low density polyethylene, 10% by weight or more and 90% by weight or less of low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ionomer, polypropylene A film layer formed of a blend of one or more selected from ethylene-butene-1 copolymer and b. A nylon film or PET film layer having a molecular orientation angle of 0 to 22.5 degrees c. The innermost layer in contact with the contents is a. And the outermost layer is b. A refill pouch formed of a laminated film laminated as a film layer of. 2. The upper shoulder of the refill pouch has an angle of 25 degrees or more.
The refill for refilling according to claim 1, wherein a spout portion inclined at a direction of 60 degrees is formed, and a tear guide wire is arranged in the spout portion so as to cross the spout portion. Pouch. 3. The refill pouch according to claim 2, wherein the tear guide wire is formed by laser processing. 4. The refill for refilling according to claim 2, wherein the depth of the tear guiding line is applied to the outermost biaxially stretched film layer and does not reach the innermost layer in contact with the contents. Pouch.