JP2000095253A - Squeezing-out tubular container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vaporization of an organic solvent from the heat-sealed lower end of a tube cylinder by covering and fixing the lower end surface wherein the lower end portion of the tube cylinder is flatly pressed and heat-sealed, and both side portions of the lower end with a gas impermeable thin piece when a squeezing-out tubular container in which an adhesive or the like is contained, is manufactured. SOLUTION: A barrier head 10 integrally equipped with an end wall 11, a squeezing-out port 12 and an annular erecting portion 14, and an external layer head 20 are combined, and a tube cylinder 30 comprising a cylindrical intermediate layer 31, a thick internal cylindrical layer 32 and a thick external cylindrical layer 33, is bonded to the combined heads, and a tubular container is manufactured. Then, the lower end portion of the tube cylinder 10 is flatly pressed into a straight line, and the internal cylindrical layer 32 being confronted with each other, is closed by heat-sealing, and a cream-form product is filled from the squeezing-out port 12, and a lid is attached to the squeezing-out port 12, and a product is obtained. In this case, in order to reduce the vaporization of an organic solvent from the lower end surface 34 of the internal cylindrical layer 32 at the lower end portion of the tube cylinder 10, the lower end surface 34 and both side portions 35, 35 of the lower end are covered from the outside with a gas impermeable thin piece 40, and the gas impermeable thin piece 40 is fixed to the lower end portion of the tube cylinder 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rubber-based adhesive,
The present invention relates to a squeezed tube container for containing a creamy or viscous product containing an epoxy adhesive and other organic solvents.

[0002]

2. Description of the Related Art When a tube head and a tube cylinder of a tube container are molded with a polyolefin resin, for example, polyethylene, and the above-described product is put in the tube container,
Polyethylene has no barrier properties to organic solvents such as toluene, benzene, cyclohexanone, cyclohexanol, petroleum ether, and xylene contained in the product, so these organic solvents volatilize out of the tube head and tube cylinder, Is hardened and deteriorates. For this reason, the present applicant has disclosed, for example, in Japanese Patent Application Laid-Open No. 8-267603 and Japanese Patent Application No. 10-241522, an inner surface of an umbrella-shaped tube head having a squeezing opening at the top and an upper end of the tube head. A thin-walled saponified ethylene-vinyl acetate copolymer having a barrier property against an organic solvent, for example, a tube-shaped intermediate layer of a tube cylinder fixed to the inner periphery of the tube, such as EVAL (trade name, manufactured by Kuraray Co., Ltd.) ), The outer layer of the tube head, the outer cylindrical layer and the inner cylindrical layer of the tube tube are formed of thick polyethylene, and a product containing an organic solvent is placed inside the tube tube. A squeezed tube container was proposed in which the lower end portions of the inner cylindrical layer of polyethylene, which were pressed into one letter and opposed to each other, were heat-sealed and sealed.

[0003]

With the above-mentioned tube container, the organic solvent of the product in the container can be prevented from evaporating from the tube head or around the tube cylinder by EVAL. However, since the lower end of the tube cylinder is pressed into a single letter and sealed with heat seal, it is the cylindrical inner layer made of polyethylene of the tube cylinder. The organic solvent evaporates little by little from the heat-bonded surfaces of the comrades, and the product deteriorates in a bad way.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed for the purpose of reducing the volatilization of an organic solvent from the heat-sealed lower end of a tube cylinder. Seal the lower end face and both sides of the lower end,
It is characterized by being covered and fixed with a gas-impermeable flake.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The squeezed tube container of the illustrated embodiment is proposed in Japanese Patent Application No. 10-241522, and a tube head 1 has a thin-walled barrier head 10 formed of EVAL and an outside of the barrier head. A thick outer layer head 20 formed of a polyolefin resin, for example, polyethylene. The barrier head 10 integrally includes an end wall 11 having a conical surface, a squeezing opening 12 for contents protruding upward from a top of the end wall, and an annular upright portion 14 protruding upward from a peripheral edge of the end wall 11. Equipped and squeezed outlet 12
An annular or helical projection 13 is provided on the outer periphery of. When the diameter of the tube container is about 40 mm, the thickness of the end wall 11, the squeezing port 12, and the annular upright portion 14 is about 0.7 mm, the diameter of the peripheral edge of the end wall 11 is about 39 mm, and The height of the annular ridge to the upper end of the annular ridge 14 is about 1.3 mm, and the protrusion of the projection 13 from the outer periphery of the squeeze port is about 0.5 mm.

A thick outer layer head 20 formed of a polyolefin resin, for example, low density polyethylene (LDPE) outside the barrier head 10 has a thick end wall 21 overlapping the end wall of the barrier head, A thick squeeze port 22 is provided integrally surrounding the squeeze port 12 of the head from outside. The squeeze port 22 protrudes longer than the squeeze port 12 of the barrier head, and the inward thickened portion 23 of the protruded portion locks the upper end of the squeeze port of the barrier head downward.

When the diameter of the tube container is about 40 mm,
The wall thickness of the thick end wall 21 of the outer layer head and the squeeze port 22 is about 1.3 mm, and the squeeze port 22 is about 2 mm higher than the squeeze port of the barrier head. Therefore, the squeeze port 22 that locks the upper end of the squeeze port of the barrier head downward.
The height of the inward thickened portion 23 is 2 mm, and the inward thickness from the inner periphery of the squeeze outlet is the same as the thickness of the squeeze outlet 12.
7 mm. The peripheral edge 21 'of the thick end wall 21 of the outer layer head is surrounded by the annular upright portion 14 of the peripheral edge of the end wall 11 of the barrier head having the same height as 1.3 mm.

As is apparent from the above description, the inner periphery of the thick wall outlet 22 of the polyethylene outer layer head 20 formed outside the EVAL barrier head 10 protrudes from the outer periphery of the barrier head outlet 12. The annular or spiral projection 13 bites. An annular upright portion 14 projecting upward from the peripheral edge of the end wall of the barrier head surrounds the peripheral edge 21 ′ of the thick end wall of the outer layer head, and squeezes the barrier head at the upper end of the squeeze port 22 of the outer layer head. Mouth 1
The inward thickened portion 23 located above the upper end of the second locks the upper end of the squeeze port 12 downward. As a result, the EVAL barrier head 10 having poor adhesion and the thick outer layer head 20 made of polyethylene formed outside thereof are mechanically and strongly bonded without using adhesion.

A flexible tube cylinder 30 has a thin cylindrical intermediate layer 31 made of EVAL, and an adhesive having an adhesive property to both EVAL and a polyolefin resin, for example, a polyethylene resin, inside and outside the cylindrical intermediate layer. Thick inner tube layer 32 and thick outer tube layer 33 adhered by an agent, for example, a polyethylene adhesive (trade name: ADMER, manufactured by Mitsui Petrochemical Industry Co., Ltd.)
And

When the diameter of the tube container is 40 mm, E
The thickness of the VAL tubular intermediate layer 31 is 15 μm, and the thick inner tubular layer 32 and the thick outer tubular layer 33 may be a mixed layer of 50% admer and 50% polyethylene, or a polyethylene layer and a polyethylene layer. May be two layers of an admer layer that adheres to the cylindrical intermediate layer.

The polyethylene of the thick inner cylinder layer 32 composed of a mixed layer of 50% of admer and polyethylene is linear low-density polyethylene (L-LDPE), and the inner cylinder layer has a thickness of 20%.
0 μm, the polyethylene of the thick outer cylinder layer 33 made of the mixed layer is low density polyethylene (LDPE), the outer cylinder layer has a thickness of 235 μm, and the EVAL cylindrical intermediate layer has a thickness of 15 μm.
The total thickness of the three layers added is 450 μm (0.45 mm)
It is.

In the case where the thick inner cylinder layer 32 and the thick outer cylinder layer 33 are composed of two layers of inner admer layers 32a and 33a and outer polyethylene layers 32b and 33b as shown in FIG. The polyethylene layer 32b of the thick inner cylinder layer is linear low-density polyethylene (L-LDPE), and its layer thickness is 170
μm, the thickness of the admer layer 32a is 54 μm, and the polyethylene layer 33b of the thick outer cylinder layer is a low-density polyethylene (LDP).
E), the layer thickness is 157 μm, the layer thickness of the admer layer 33a is 54 μm, and the layer thickness of the cylindrical intermediate layer of EVAL is 15 μm.
The total thickness of the five layers to which is added is 450 μm (0.45 mm)
It is. Since the admer is also more expensive than polyethylene, the thick inner cylinder layer and the thick outer cylinder layer are composed of the admer layer and the polyethylene layer, rather than the admer and the mixed layer in which polyethylene is mixed at 50%. Tuber tube costs are lower because admer usage is lower.

In the case where the thick inner cylinder layer and the thick outer cylinder layer are formed of a mixed layer of 50% of Admer and polyethylene, the tube cylinder is extruded by a triple inner and outer cylindrical extruder, and the thick inner cylinder layer is formed. When the thick outer cylinder layer is formed of the admer layer and the polyethylene layer as shown in FIG. 1, the tube cylinder is extruded by an inner and outer five-layer cylindrical extruder. The inner diameter of the extruded tube tube is about 39 mm when the diameter of the tube container is about 40 mm, and the extruded tube tube is cut into an appropriate length for use.

As a tube container, a tube head 1 is fitted to the inner periphery of the upper end of a tube tube 30, and an inner tube layer 32 made of polyethylene and an outer tube layer 3 at the upper end of the tube tube.
3 is fixed to the outer surface of the periphery of the thick end wall of the outer layer head made of polyethylene of the tube head. Then, the lower end of the tube cylinder is pressed into one character, and the inner cylinder layer facing each other is heat-sealed and closed, and a creamy or viscous product is filled from the squeeze port 12 surrounded by the squeeze port of the tube head. A screw cap is attached to the male screw provided on the outer periphery of the squeeze port and closed, or the squeeze cylinder is closed with a screw cap first.
A creamy or viscous product is filled from the lower end of the open tube tube into the inside, and then the lower end portion of the tube tube is pressed into a single letter, and the inner tube layers 32, 32 facing each other are heat-sealed. You only need to close it.

Since the inner cylinder layers 32, 32 at the lower end of the tube cylinder, which are heat-sealed and closed, are made of polyethylene, the organic solvent in the product is heat-sealed after a long period of time after filling the tube container with the product. The products are slightly but volatilized through the lower end surfaces of the inner cylinder layers 32, 32, and the product is deteriorated.
A lower end surface 34 of the tube cylinder for reducing the volatilization of the organic solvent from the lower end surfaces of the heat-sealed inner cylinder layers 32, 32;
Both sides 35, 35 of the lower end are covered with a gas-impermeable flake 40 from the outside, and are fixed to the lower end of the tube cylinder.

The gas-impermeable flakes 40 are aluminum foil 4
1 may be obtained by laminating a polyolefin resin, for example, a polyethylene layer 42 on one side.
2 is a lower end surface 34 of the tube cylinder and both sides 35, 3 of the lower end.
5 and sandwich the aluminum foil 41 in a U-shape so as to contact
The polyethylene layer 42 may be heat-sealed to the polyethylene exposed at the lower end of the tube cylinder. The thickness of the aluminum foil may be about 30 μm, and the thickness of the polyethylene layer laminated thereon may be about 30 μm.

Although the tube container of the illustrated embodiment is shown in Japanese Patent Application No. 10-241522 as described above, the tube container described in JP-A-8-267603 may be used.

[0018]

As is apparent from the above, according to the present invention, the lower end face 3 of the tube tube closed by heat sealing is provided.
4 is fixed by covering it with the gas impermeable flakes 40, so that the volatilization of the organic solvent from the lower end surfaces of the inner cylinder layers 32, 32 which are closed by heat sealing the tube cylinder can be greatly reduced. For example, in the case where the lower end of the tube cylinder disclosed in Japanese Patent Application Laid-Open No. 8-267603 is simply pressed down and the facing inner cylinder layer of polyethylene is simply heat-sealed and closed, the organic solvent of the adhesive filled in the tube container is a tube. 1.35% volatilized from the lower end of the tube for three months. However, when the aluminum foil 41 was fixedly attached to the lower end surface 34 which was closed by heat sealing according to the present invention, the organic solvent from the lower end of the tube tube was removed. Emissions for three months have fallen to 0.60%. The gas-impermeable flakes 40 are also fixed to both sides of the lower ends of the tubular outer layers 33, 33 of the tube cylinder, and are not peeled off from the tube cylinder.

[Brief description of the drawings]

FIG. 1 is a side view of a squeezed tube container according to the present invention, showing a main part as an enlarged cross section.

FIG. 2 is a front view showing a main part of a lower end portion of a tube cylinder of the tube container as an enlarged cross section.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tube head 10 EVAL barrier head 12 EVAL barrier head squeeze 20 Polyolefin resin outer layer head 22 Polyolefin resin outer layer head squeeze 30 Tube cylinder 31 EVAL cylindrical intermediate layer of tube cylinder 32 Tube cylinder Inner cylinder layer of polyolefin resin 33 Outer cylinder layer of polyolefin resin in tube cylinder 34 Lower end surface of tube cylinder 35, 35 Both sides of lower end of tube cylinder 40 Gas impermeable flake

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E065 AA02 BA14 BB02 BB03 CA09 DA04 DD05 FA15 GA03 4F213 AA03 AA04 AA07 AA10 AG03 AG08 AH55 AH81 WA15 WA53 WA83 WA90 WB01

Claims (1)

[Claims] 1. A thin-walled ethylene vinyl acetate copolymer comprising: an inner surface of an umbrella-shaped tube head having a squeezing opening provided at the top; and a cylindrical intermediate layer of a tube cylinder having the tube head fixed to an inner periphery of an upper end portion. The outer layer of the tube head, the outer cylindrical layer and the inner cylindrical layer of the tube tube are formed of a thick polyolefin resin, and a product containing an organic solvent is placed inside the tube tube. In a squeezed tube container in which the lower end of the tube cylinder is pressed into a single letter and the lower ends of the tubular inner layers opposed to each other in the tube tube are heat-sealed and sealed, the lower end surface of the tube tube in which the lower end of the tube tube is pressed and heat-sealed And a squeezed tube container, wherein both sides of the lower end are covered and fixed with gas-impermeable flakes.