JP2001038861A - Laminated film for laminated tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a laminated film for a laminated tube with increased nerve of the laminated film without changing the basic substance constitution and the whole thickness of the laminated film constituting the body part of the laminated tube and without decreasing hiding properties and sealing properties. SOLUTION: In a laminated film for a laminated tube consisting of at least an inner layer 13, a middle layer 12 and an outer layer 11 being polyethylene resins and a barrier film 14, at least one of the polyethylene resin of the outer layer 11 and the middle layer 12 has a constitution wherein an L-LDPE resin or a HDPE resin and an LDPE resin are laminated and the thickness of the total of the inner layer 13, the middle layer 12 and the outer layer 11 is constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film used for the body of a laminated tube used for packaging viscous materials such as medicines, cosmetics, and foods.

[0002]

2. Description of the Related Art In general, a laminate tube has a laminated structure of LDPE resin / printing / LDPE resin / stretched film / LDPE resin or L-LDPE resin in the transparent type from the outside, or LDPE resin / stretched film / printing in the colored type. / Colored LDPE resin / Colored LL
It was a laminated structure of DPE resin / LDPE resin or L-LDPE resin.

In this laminated structure, the outer LDPE resin, the intermediate colored LDPE resin or the colored L-LDPE resin, the inner LDPE resin or the L-LDPE resin are formed into a tube to have a diameter of 60 μm or more, especially the inner LDP resin.
E resin, intermediate colored LDPE resin or colored L-LDP
The E resin was generally 100 μm or more.

[0004] In order to strengthen the rigidity (increase the rigidity) of the torso so as to indicate the suitability for squeezing the laminate tube, it is necessary to change the thickness of each layer constituting film constituting the laminated film used in the laminate tube torso. Or, it is common practice to increase the overall thickness.

However, in the method of increasing the rigidity by increasing the thickness of the constituent films of each layer and increasing the rigidity, the dimensions of each part are different due to the change in the thickness. In doing so, it is necessary to change or adjust the dimensions of all the dies and jigs of the filling line, which increases the working time, is inconvenient, and increases the cost.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a laminated film without changing the basic material composition and the overall thickness of the laminated film constituting the body of the laminated tube, and without deteriorating the concealing property and the sealing property. It is an object of the present invention to provide a laminated film for a laminated tube having increased waist strength (rigidity).

[0007]

Means for Solving the Problems A first invention of the present invention is:
At least the inner layer, the intermediate layer and the outer layer are laminated films for a laminated tube composed of a polyethylene resin and a barrier film, and the polyethylene resin of at least one of the outer layer and the intermediate layer is formed by laminating an L-LDPE resin or an HDPE resin and an LDPE resin. Configuration,
A laminated film for a laminate tube, wherein the total thickness of the inner layer, the intermediate layer, and the outer layer is constant.

According to a second aspect, in the first aspect, the polyethylene resin of the intermediate layer is an HDPE resin / colored LDPE resin or an HDPE resin / colored LDPE resin.
The laminated film for a laminated tube according to claim 1, wherein the laminated film has a constitution of resin / HDPE resin.

In a third aspect based on the first aspect, the polyethylene resin for the intermediate layer is L-LDPE.
A laminated film for a laminated tube, wherein the laminated film has a structure of resin / colored LDPE resin or L-LDPE resin / colored LDPE resin / L-LDPE resin.

According to a fourth aspect, in the first to third aspects, the polyethylene resin of the outer layer is made of LDPE.
Resin / LDPE resin / LDPE resin in a three-layer configuration, and the density of the LDPE resin disposed in the middle is LDP disposed on both sides.
A laminated film for a laminate tube, wherein an LDPE resin having a density lower than that of an E resin is used.

According to a fifth aspect of the present invention, there is provided the laminated film for a laminate tube according to the first to fourth aspects, wherein the barrier film is disposed between an intermediate layer and an outer layer.

According to a sixth aspect of the present invention, there is provided the laminated film for a laminate tube according to the first to fifth aspects, wherein a printing base material layer is provided between the intermediate layer and the outer layer.

As described above, according to the present invention, at least one of the outer layer and the intermediate layer is made of a conventional LDPE resin,
Not only L-LDPE resin, but also LDPE resin or L-
L-LDPE resin or H different in density from LDPE resin
Since the laminated film has a configuration in which DPE resin is laminated, or a configuration in which LDPE resins having different densities are arranged in the inner and outer layers and the intermediate layer, even if the total thickness of the outer layer, the intermediate layer, and the inner layer is the same, You can strengthen your waist. In the case of the intermediate layer, the hiding property is not impaired as in the conventional case by adding a colorant to the LDPE resin having a low density.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. FIG. 1 is a sectional view showing the material composition of the laminated film for a laminated tube of the present invention, in which an outer layer 11, an intermediate layer 12, and an inner layer 13 are sequentially laminated, and a barrier film 14, a printing base A material layer 15 is provided.

The outer layer 11 is a polyethylene resin layer, and is usually used by kneading an antistatic agent such as a surfactant into a polyethylene resin in order to prevent adhesion of dust and the like. As the polyethylene resin, L-LDPE, LDPE,
An ethylene copolymer or the like can be preferably used, and a polyethylene resin layer having a thickness of 100 μm or more can be preferably used.

The polyethylene resin layer of the outer layer 11 is LDP
When using E resin, the first LDPE resin layer 11a / second
The three-layer structure of the LDPE resin layer 11b / third LDPE resin layer 11c is used, and the density of the LDPE resin constituting the second LDPE resin layer 11b disposed in the middle is determined by the first layer disposed on both sides thereof.
LDPE resin layer 11a and third LDPE resin layer 11c
By setting the density to be lower than the density of the LDPE resin constituting the above, it is possible to strengthen the stiffness even if the overall thickness of the outer layer is the same.

As the first LDPE resin layer 11a, for example, an LDPE resin film (thickness: 30) containing an antistatic agent is used.
μm), as the second LDPE resin layer 11b, for example, L
DPE resin (thickness: 20 μm), third LDPE resin layer 11
As c, for example, an LDPE resin film (thickness of 60 μm)
m) are used.

The intermediate layer 12 is a polyethylene resin layer,
-LDPE, LDPE, ethylene copolymer and the like can be preferably used. For the purpose of protecting the contents from ultraviolet rays and the like, a white inorganic pigment such as titanium oxide or zinc white is added as a colorant to the polyethylene resin layer of the intermediate layer. The thickness of the intermediate layer is preferably about 100 μm.

As the polyethylene resin layer of the intermediate layer 12, a two-layer structure of a first intermediate layer 12a and a second intermediate layer 12b,
Alternatively, the first intermediate layer 12a, the second intermediate layer 12b, and the third intermediate layer 12c have a three-layer structure. For example, in the case of a two-layer structure,
As the second intermediate layer 12b, an LDPE resin film (40 μm in thickness) containing a white inorganic pigment, as the first intermediate layer 12a, a transparent L-LDPE resin film (60 μm in thickness), and in the case of a three-layer configuration, the first intermediate layer 12a As the third intermediate layer 12c, a transparent L-LDPE resin (22 μm in thickness),
LDPE containing a white inorganic pigment as the second intermediate layer 12b
By using each of the resin films (thickness: 56 μm), the stiffness of the laminated film can be increased without impairing the concealability.

As the resin used for the first intermediate layer 12a and the third intermediate layer 12c, HDPE resin can be used in addition to L-LDPE resin. The two-layer and three-layer intermediate layers can be produced by a co-extruded multilayer film production method.

The inner layer 13 is also a polyethylene resin layer, and like the intermediate layer, L-LDPE, LDPE, ethylene copolymer and the like can be preferably used. If necessary, a white inorganic pigment such as titanium oxide or zinc white may be added.

Between the outer layer 11 and the intermediate layer 12, a barrier film 14 and a printing base material layer 15 can be provided as required. As a resin layer constituting the barrier film 14, an ethylene-vinyl alcohol copolymer resin (E
VOH), a plastic film such as a polyethylene terephthalate (PET) film formed with an inorganic compound vapor-deposited thin film or a metal compound vapor-deposited thin film can be preferably used.

As the resin layer constituting the printing base material layer 15, PET, biaxially oriented polypropylene (OP
P), biaxially stretched nylon (ONy), unstretched polypropylene (CPP), LDPE, HDPE, and other films can be used, and the print layer 16 is usually provided on this film. And it is preferable to use the same kind of film as the barrier film.

As shown in FIG. 1, a barrier film 14 may be provided inside the outer layer 11 and a printing base layer may be provided inside the outer layer 11 with the printing layer 16 outside, or the printing layer 16 may be provided inside the outer layer 11. May be provided with the printing substrate layer 15 on the outside, and the barrier film 14 may be provided on the inside thereof.

Next, the production of the laminated film 10 is performed, for example, as follows. First, the printing base material layer 15 provided with the printing layer 16 and the barrier film 14 are combined with the printing layer 16.
Is bonded inside by dry lamination using, for example, a two-component reactive polyester resin adhesive.

[0026] The printing substrate layer surface of the composite film and the intermediate layer 12 separately produced by a co-extruded multilayer film manufacturing method.
Are bonded by a dry lamination method using, for example, the same two-component reactive polyester resin adhesive as described above.

The barrier film surface of the composite film and the outer third LDPE resin layer 11c are bonded together by extrusion using a molten polyethylene as an adhesive layer by a lamination method.

The inner layer 13 is formed by extruding and laminating a molten polyethylene resin on the intermediate layer surface of the laminated film by a lamination method.

Finally, the third LDPE of this composite film
Resin layer surface and separately prepared outer first LDPE resin layer 1
The PE film containing the antistatic agent as 1a is laminated by extrusion lamination using molten polyethylene as an adhesive layer to obtain a laminated film for a laminated tube of the present invention.

[0030]

EXAMPLES Examples of the present invention will be described below more specifically. <Example 1> As the first LDPE layer 11a of the outer layer 11,
LDPE film containing antistatic agent (thickness: 30 μm, density: 0.930 g / cm ³ ), LDPE film (thickness: 60 μm, density: 0.9) as ^third LDPE layer 11c
30 g / cm ³ ), as the intermediate layer 12, a milky white LDPE film containing a white inorganic pigment (thickness: 110 μm, density;
0.930 g / cm ³ ), a PET film (thickness: 12 μm) on which an aluminum oxide vapor-deposited thin film was formed as a barrier film 14, a printing layer 1 as a printing base material layer 15.
The PET film (thickness; 12 μm) provided with No. 6 was prepared.

Next, each of the previously prepared films is subjected to a dry lamination method (using a two-component reaction type polyester resin-based adhesive as an adhesive) and an extrusion lamination method (resin is LDPE, density: 0. 919
g / cm < ³ >, provided that the inner layer 13 is L-LDPE, and that the LDPE film (30 [mu] m thick, density: 0.930) shown in FIG.
g / cm ³ ) (11a) / PE adhesive layer (20 μm thickness, density; 0.919 g / cm ³ ) (11b) / LDPE film (60 μ thickness, density; 0.930 g / cm ³ ) (11
c) / PE adhesive layer (20 μm thickness, density; 0.919 g /
cm ³ ) (not shown) / PET film (12 μm thick) on which aluminum oxide deposited thin film was formed (14) / printing layer (16) / PET film (12 μm thickness) (15) /
Milky white LDPE film (100 μm thickness, density: 0.93
0 g / cm ³ ) (12) / L-LDPE (50 μm thick)
(13) [Inside of Container] A laminated film for a laminated tube of Example 1 having a total thickness of 304 μm was prepared.

Example 2 Mild white L-
LDPE film (100 μm thickness, density; 0.920 g
/ Cm ³ ) instead of L-LDPE (22 μm thick) (12a) /
Milky L-LDPE (56 μm thick) (12b) / L-LD
The same material and method as in Example 1 except that a co-extruded film having a PE (22 μm thickness) (12c) configuration was used.
Thickness, density: 0.930 g / cm ³ ) (11a) / PE adhesive layer (20 μm thick, density: 0.919 g / cm ³ ) (1
1b) / LDPE film (60 μ thickness, density; 0.93
0g / cm ³ ) (11c) / PE adhesive layer (20 μm thick,
(Density: 0.919 g / cm ³ ) (not shown) / PET film (12 μm) on which aluminum oxide deposited thin film was formed
m thickness) (14) / print layer (16) / PET film (1
2 μm thickness) (15) / L-LDPE (22 μm thickness) (1
2a) / milk white L-LDPE (56 μm thick) (12b) /
L-LDPE (22 μm thick) (12c) / L-LDPE
(50 μm thickness) (13) [Container inside] The total thickness of the configuration is 3
A laminated film for a laminated tube of Example 2 having a thickness of 04 μm was produced (see FIG. 2).

<Comparative Example 1> In the same manner as in Example 1, a laminated film (total thickness 304 μm) for a currently used laminate tube having the following structure was prepared.
And [Outside of container] LDPE film containing antistatic agent (50 μm thickness, density; 0.930 g / cm ³ ) / LDP
E (30 μm thickness, density; 0.919 g / cm ³ ) / LD
PE film (50 μm thickness, density; 0.915 g / cm
³ ) / P with a silicon aluminum oxide deposited thin film formed
ET film (12 μm thickness) / print layer / PET film (12 μm thickness) / milky white LDPE film (100 μm
Thickness, density; 0.920 g / cm ³ ) / LDPE (50 μ
m thickness, density; 0.930 g / cm ³ ) [inside of container]

A total of three types of laminated films for laminated tubes prepared in this manner were cut into prescribed dimensions, and the waist in the longitudinal direction (MD) of the tube and the circumferential direction (TD) of the tube were cut. Was measured using a stiffness tester (measuring width: 7 mm), and the side seal strength and heat seal strength when molded into a tube were also measured under the conditions described. Table 1 shows the results.

[0035]

[Table 1]

Considering from these results, the laminated film for a laminated tube of the present invention has the same seal strength, and in particular, the stiffness in the circumferential direction (TD) of the tube is improved as compared with Comparative Example 1. You can see that there is.

[0037]

As described above, according to the present invention, without changing the material composition of the laminated film and the total thickness of the outer layer, the intermediate layer and the inner layer, and without deteriorating the concealing property and the sealing property, Since the stiffness of the laminated film can be improved, it can be formed by a conventional tube forming method, and there is no need to newly change dimensions.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cross section of an embodiment of the laminated film for a laminated tube of the present invention.

FIG. 2 is an explanatory view showing a cross section of another embodiment of the laminated film for a laminated tube of the present invention.

[Explanation of symbols]

 10 laminated film 11 outer layer 11a first LDPE resin layer 11b second LDPE resin layer 11c third LDPE resin layer 12 intermediate layer 12a first intermediate layer 12b second intermediate layer 12c third intermediate layer 13 inner layer 14 barrier film 15 printing substrate layer 16 printing layer

Continued on front page F-term (reference) 3E086 AD03 BA04 BA15 BB01 BB62 CA01 4F100 AA19 AK04A AK04B AK04C AK05A AK05B AK06A AK06B AK42 AK63A AK63B AR00D AR00E BA04 BA05 BA07 BA10A BA10C BA13E13 GBD

Claims (6)

[Claims] 1. A laminated film for a laminate tube wherein at least the inner layer, the intermediate layer and the outer layer are made of a polyethylene resin and a barrier film, wherein at least one of the outer layer and the intermediate layer is made of a linear low-density polyethylene (L-LDPE). A) a laminated film for a laminated tube, wherein a laminated structure of a resin or a high-density polyethylene (HDPE) resin and a low-density polyethylene (LDPE) resin is provided, and the total thickness of the inner layer, the intermediate layer and the outer layer is constant; . 2. The method according to claim 1, wherein the polyethylene resin of the intermediate layer is HD.
The laminated film for a laminated tube according to claim 1, wherein the laminated film has a structure of PE resin / colored LDPE resin or HDPE resin / colored LDPE resin / HDPE resin. 3. The method according to claim 1, wherein the polyethylene resin of the intermediate layer is L-
The laminated film for a laminated tube according to claim 1, wherein the laminated film is composed of LDPE resin / colored LDPE resin or L-LDPE resin / colored LDPE resin / L-LDPE resin. 4. The method according to claim 1, wherein the polyethylene resin of the outer layer is LDP.
E resin / LDPE resin / LDPE resin
The density of the LDPE resin arranged in the middle is
4. The laminated film for a laminated tube according to claim 1, wherein an LDPE resin having a density lower than that of the PE resin is used. 5. The laminated film for a laminated tube according to claim 1, wherein said barrier film is disposed between an intermediate layer and an outer layer. 6. The laminated film for a laminated tube according to claim 1, wherein a printed base material layer is provided between the intermediate layer and the outer layer.