JP2001062892A - Laminate and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate manufacturing method using no anchor coat agent in laminating a polyethylene resin layer to a base material made of a polyester or polypropylene film. SOLUTION: In a laminate manufacturing method wherein a polyethylene resin is extruded in a molten state to be laminated to the bonding surface of a base material of which at least the bonding surface comprises a polyester or polypropylene film to form a laminate 1, flame treatment is applied to the bonding surface of the base material 3 and the polyethylene resin is extruded at about 300 deg.C to form a molten extruded film 5 which is, in turn, contact- bonded and laminated to the base material 3 to which flame treatment is applied to produce the laminate 1. In this case, surface oxidizing treatment such as corona discharge treatment, plasma treatment, anchor coat treatment or ozone treatment is not applied to the bonding surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material comprising a single-layer polyester film or polypropylene film as a base material, a multi-layer base material having a bonding surface of polyester or polypropylene, and a bonding surface having a printed bonding surface. At least the bonding surface is a substrate such as polyester or polypropylene, such as a single-layer or multilayer substrate whose surface is polyester or polypropylene, and a polyethylene resin is used for the purpose of imparting heat sealing properties to the bonding surface of the substrate. The present invention relates to a method for producing a laminate to be laminated, and a laminate, and more particularly, to a laminate having excellent adhesive strength without using an anchor coat agent and showing no surface layer breakage of a polyester film or a polypropylene film. The present invention relates to a manufacturing method and a laminate.

[0002]

2. Description of the Related Art Hitherto, polyester films or polypropylene films have been used as packaging materials in many fields including food packaging. For packaging applications, it is often used as a bag-like packaging material, and therefore it is necessary to have heat sealing properties, and therefore polyethylene as a sealant that has little effect on hygiene etc. in food and other packaging contents. 2. Description of the Related Art A method for producing a laminate in which a system resin is melt-extruded to the innermost side and laminated with a polyester film or a polypropylene film is widely known.

[0003] The base material is a base material made of a single-layer polyester film or polypropylene film, a multi-layered base material whose joining surface is made of polyester or polypropylene, and a single base material whose printed surface is made of polyester or polypropylene. At least the bonding surface is a base material of polyester or polypropylene, such as a base material of a layer or a multilayer, and when the melt-extruded resin having the heat sealing property is a polyethylene-based resin, from the inertness of the surface of the melt-extruded film of the polyethylene-based resin, There is no mutual heat-fusibility, so in the melt extrusion of the polyethylene resin, the polyethylene resin is melt-extruded at a high temperature of 300 ° C. or more,
A method of activating the surface and pressure-bonding the surface to a substrate that has been subjected to an anchor coating treatment is often used.

However, since the anchor coating agent used in the above-mentioned anchor coating treatment uses a solvent, it requires an aging period at a high temperature of several days to about one week after bonding. For this reason, there is a problem of a large amount of energy and a problem of delay in delivery, etc.In addition, when the working environment is deteriorated due to evaporation of the solvent and problems in disaster prevention, and when drying after bonding is insufficient, the laminated film There have been many problems, such as the possibility that the residual solvent may smell the package contents.

[0005] In order to solve the above-mentioned problems, a base material made of a single-layer polyester film or a polypropylene film, a multi-layered base material having a bonding surface of polyester or polypropylene, When a base material with at least a bonding surface made of polyester or polypropylene and a melt-extruded resin made of a polyethylene resin, such as a single-layer or multi-layer base material with a bonded surface made of polyester or polypropylene, The surface is activated by corona treatment which is widely used, while in the case of melt extrusion of a polyethylene resin, a polyethylene resin is extruded at a high temperature of about 300 ° C. to form a melt extruded film. At least the air containing ozone is blown to the joint surface, and then the corona On the surface of the sense and the substrate, a method of crimping melt-extruded film having the ozone treatment. However, in this method, when the (polyester film or polypropylene film) / polyethylene film was peeled off, the surface layer of the polyester film or polypropylene film was broken, and there was a problem that the adhesive strength appeared small.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a method for joining a substrate made of a single-layer polyester film or polypropylene film as a substrate. A multi-layered base material whose surface is polyester or polypropylene, a single-layered or multi-layered base material whose printed surface is made of polyester or polypropylene, and a base material whose at least bonding surface is polyester or polypropylene. Excellent adhesive strength when laminating a polyethylene-based resin on the bonding surface of the base material without using an anchor coating agent and without requiring any surface oxidation treatment such as corona discharge treatment, plasma treatment, ozone treatment, etc. With polyester film or polypropylene film surface destruction It is to provide a manufacturing method and laminate have the laminate.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention firstly provides a substrate comprising a single-layer polyester film or a polypropylene film, and a multi-layer having a bonding surface of polyester or polypropylene. The base material, such as a single-layer or multi-layer base material in which the bonding surface printed on the bonding surface is polyester or polypropylene, is a base material in which at least the bonding surface is polyester or polypropylene, and the bonding surface of this base material In the method for producing a laminate in which a polyethylene-based resin is melt-extruded and a polyethylene-based resin is laminated, a frame treatment is performed on the bonding surface of the base material, and the polyethylene-based resin is extruded at a temperature of about 300 ° C. to form a melt-extruded film. Production of a laminate in which the melt-extruded film is pressure-bonded and laminated on the treated substrate A law, the joining surface is at least a corona discharge treatment, a plasma treatment anchor coat treatment, treatment such as surface oxidation treatment such as ozone treatment is a method for producing a laminate, characterized in that not performed.

Next, a second aspect of the present invention relates to a base material made of a single-layered polyester film or a polypropylene film, a multi-layered base material whose bonding surface is made of polyester or polypropylene, and a bonding surface printed on the bonding surface. Polyester or polypropylene, such as a single-layer or multi-layer substrate, at least the bonding surface is a substrate of polyester or polypropylene, polyethylene-based resin is melt-extruded on the bonding surface of this substrate, polyethylene-based resin laminated A laminate, wherein a frame treatment is performed on a joining surface of the base material, and a polyethylene-based resin is extruded on the frame treatment surface at a temperature of about 300 ° C. to form a melt-extruded film; A laminate in which the melt-extruded film is press-bonded and laminated, and the joining surface has at least Corona discharge treatment, plasma treatment, anchor coat treatment, treatment such as surface oxidation treatment such as ozone treatment is a laminate which is characterized in that no is subjected.

Next, a third aspect of the present invention is the laminate according to the second aspect, wherein the adhesive strength between the base material of the laminate and the melt-extruded film is 120 gf / 15 mm or more. It is a laminated body.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. The manufacturing method of the laminate of the present invention,
For example, as shown in the schematic explanatory view of FIG. 1, a base material made of a single-layer polyester film or a polypropylene film, a multi-layered base material having a bonding surface of polyester or polypropylene, and a bonding surface printed on the bonding surface A method for producing a laminate 1 in which a melt-extruded film 5 obtained by melt-extruding a polyethylene-based resin is laminated on a substrate 3 having at least a bonding surface of polyester or polypropylene, such as a single-layer or multilayer substrate of polyester or polypropylene. The surface is processed through the base material 3 between the flame 54 generated from the burner 52 in the frame processing device 50 and the cooling roll 56. On the other hand, a polyethylene-based resin
The melt extruded film 5 is extruded from a T-die at a temperature of about 0 ° C. to form a melt extruded film 5. The melt extruded film 5 is pressed and laminated between the nip roll 32 and the cooling roll 34 on the surface-treated substrate 3. In the present invention, the bonding surface is not subjected to a surface oxidation treatment such as a corona discharge treatment, a plasma treatment, an anchor coat treatment, an ozone treatment, and other treatments such as an electron beam irradiation treatment and an ultraviolet irradiation treatment.

In the above-described flame treatment method, ionized plasma in a flame generated when natural gas or propane is burned is blown onto the surface of the base material for treatment. The substrate such as a polyester film or a polypropylene film used in the present invention may be a standard grade, a grade having a function of easily adhering and printing on the surface, or a substrate having the surface printed thereon.
In addition, even a single-layer body, a multilayer body with other films, metal foil,
It may be a laminate with paper or the like, and may be a stretched product or an unstretched product.

The polyethylene resin melt-extruded into a film is not particularly limited. For example, low-density polyethylene produced by a radical polymerization method, high-density polyethylene produced by an ionic polymerization method, and ethylene and α -Ethylene-α- obtained by copolymerization with olefin
An olefin copolymer or the like is used. The thickness of the melt-extruded film to be extruded is preferably from 5 to 200 μm, more preferably from 10 to 60 μm. The temperature at which the polyethylene resin is melt-extruded is 200 to 340.
C. is preferable, and 290-320 ° C. is more preferable. Further, the ozone treatment on the melt-extruded film side may or may not be performed, but particularly, when the processing speed is increased, the oxidation of the surface of the melt-extruded film is performed. It is preferable to perform the ozone treatment because the water content becomes insufficient.

[0013]

Next, the present invention will be described in detail with reference to examples. <Example 1> As shown in FIG. 1, a frame 520 having a width of 520 mm and a thickness of 1 was used as a base material 3 by using a frame processing apparatus 50 for processing the surface of an object to be processed using a flame generated from a burner.
2 μm polyethylene terephthalate film (E51
02: manufactured by Toyobo Co., Ltd.), and passed through at a speed of 100 m / min to perform a high processing. On the other hand, low-density polyethylene (Mirason 14P: manufactured by Mitsui Chemicals, Inc.) was
The extruded film 5 is extruded from the T-die 30 at a temperature of 320 ° C. into a melt-extruded film 5, and the melt-extruded film is pressure-bonded between the nip roll 32 and the cooling roll 34 on the polyethylene terephthalate film surface-treated as described above to produce a laminate 1. did. The flame temperature of the flame treatment device 50 used above was 1700 ° C., the treatment time was 0.06 seconds, and the mixing ratio of natural gas and air required to generate a flame was 1: 1. The initial adhesive strength between the polyethylene terephthalate film as the base material of the laminate obtained above and the polyethylene layer as the melt-extruded film was measured. The measurement conditions were T-type peeling and a peeling speed of 300 mm / min.

Example 2 A 12 μm thick polyethylene terephthalate film (E5102: manufactured by Toyobo Co., Ltd.) was printed (white ink: New LP Super: manufactured by Toyo Ink Mfg. Co., Ltd.) on the entire surface of the substrate 3. A surface treatment, pressure bonding, and measurement of initial adhesive strength were performed in the same manner as in Example 1 except for using the same.

<Comparative Example 1> A conventional corona treatment apparatus, which is widely used in industry, was used to obtain a width of 520 mm and a thickness of 1 mm.
2 μm polyethylene terephthalate film (E51
02: manufactured by Toyobo Co., Ltd.) at a speed of 100 m / min to perform the surface treatment, and the same pressure bonding and measurement of the initial adhesive strength as in Example 1 were performed. At this time, the output of the corona treatment device was 3 kW, and the treatment density was 50 W / m ² /
min.

<Comparative Example 2> A space between opposed electrodes provided with a dielectric material is filled with an inert gas, and a low-temperature plasma discharge region generated by applying a high voltage between the electrodes is used to process a workpiece. A polyethylene terephthalate film (E5102, manufactured by Toyobo Co., Ltd.) having a width of 520 mm and a thickness of 12 μm was prepared using an atmospheric pressure plasma processing apparatus for treating the surface.
Compression bonding and measurement of the initial adhesive strength were performed in the same manner as in Example 1 except that the surface treatment was performed by passing at a speed of 00 m / min. At this time, the output of the atmospheric pressure plasma processing apparatus was 3 kW, and the processing density was 50 W / m ² / min. Table 1 shows the measurement results of the initial adhesion strength between the polyethylene terephthalate film as the base material and the polyethylene layer as the melt-extruded film in Examples 1-2 and Comparative Examples 1-2 obtained in this way, and the peeled state at that time. It is shown in FIG.

[0017]

[Table 1]

From the above Table 1, the initial adhesive strength when the polyethylene terephthalate (PET) film was subjected to corona treatment and atmospheric pressure plasma treatment was 110 1.
While the laminate was as small as 30 gf / 15 mm and showed PET surface layer destruction, the laminated body of the present invention subjected to frame treatment had an increased adhesive strength and exhibited 335 gf / 15 mm. When a polyethylene terephthalate film having a printed surface bonded to polyethylene is used as the base material, an initial adhesive strength higher than that of the polyethylene terephthalate film alone is obtained, and 400 gf / 15 mm is obtained. Was done.

<Example 3> Instead of the substrate 3 made of the polyethylene terephthalate film of Example 1, a thickness of 20
A laminate 1 in which low-density polyethylene was laminated was produced by treating under the same conditions as in Example 1 except that a biaxially stretched polypropylene film of μm (M-1: manufactured by Tosello Co., Ltd.) was used. And initial adhesive strength and temperature as in Example 1;
The adhesive strength after storage for 2 months in an environment of 25 ° C. and 65% humidity was measured, and the measurement results are shown in Table 2.

Example 4 Lamination was carried out in the same manner as in Example 3, except that the entire surface of the polypropylene film of Example 3 was printed (white ink; NEW MAX, manufactured by Toyo Ink Mfg. Co., Ltd.). Body 1 was produced. And Example 3
Similarly to the above, the initial adhesive strength and the adhesive strength after storage for 2 months were measured, and the measurement results are shown in Table 2.

Comparative Example 3 A laminate was prepared by performing the same treatment as in Comparative Example 1 except that the biaxially stretched polypropylene film used in Example 3 was used as the polyethylene terephthalate film of Comparative Example 1. Then, as in Example 3, the initial adhesive strength and the adhesive strength after storage for 2 months were measured, and the measurement results are shown in Table 2.

Comparative Example 4 A laminate was prepared by performing the same treatment as in Comparative Example 1 except that the biaxially stretched polypropylene film used in Example 3 was the polyethylene terephthalate film of Comparative Example 2. . Then, as in Example 3, the initial adhesive strength and the adhesive strength after storage for 2 months were measured, and the measurement results are shown in Table 2.

[0023]

[Table 2]

[0024]

As described above, the present invention has the following effects. That is, a base material made of a single-layer polyester film or a polypropylene film, a multi-layered base material having a bonding surface of polyester, a single-layered or multi-layered base material having a bonding surface printed on the bonding surface made of polyester, at least. In a method of manufacturing a laminate in which a polyethylene-based resin is melt-extruded on a base material whose bonding surface is polyester, the surface is treated through the base material between a flame and a cooling roll generated from a burner in a frame processing device, Since the polyethylene-based resin was extruded at a temperature of about 300 ° C. to form a melt-extruded film, and the melt-extruded film was pressed and laminated on the surface-treated substrate as described above,
A laminate with excellent adhesion without surface treatment such as anchor coating agent, other surface oxidation treatment such as corona discharge treatment, plasma treatment, ozone treatment, etc., and without destruction of the surface layer of polyester film or polypropylene film is obtained. Can be

Further, since it is not necessary to perform anchor coating on the base material, it is possible to simplify the working process, shorten the delivery time by eliminating the need for an aging period, and to save energy. The problem of impairing the taste of the packaged foods, the possibility of odors on the package contents due to residual solvent when the drying after bonding is insufficient, the deterioration of the work environment due to the volatilization of the solvent, and disaster prevention. Many problems such as the problem described above can be solved. Therefore, the present invention exerts an excellent practical effect particularly in use as a soft packaging bag for packaging foods, liquid detergents, and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross section illustrating a method of manufacturing a laminate of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Laminated body 3 ... Substrate 5 ... Melt extruded film 30 ... T-die 32 ... Nip roll 34 ... Cooling roll 50 ... Frame processing device 52 ... Burner 54 ... Flame 56 ... Cooling roll

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 4F100 AK01B AK04C AK06 AK07A AK41A AK42 BA02 BA03 BA10B BA10C EC032 EH172 GB15 HB31A JK06 JL12C 4F207 AA04 AD05 AD08 AD20 AD27 AG03 KA01 KA17 KB13 KJ84 KK64

Claims (3)

[Claims] 1. A base material comprising a single-layer polyester film or polypropylene film, a multi-layer base material having a bonding surface of polyester or polypropylene, a single layer having a printed bonding surface of polyester or polypropylene, or In a method for producing a laminate in which at least the bonding surface is a polyester or polypropylene, such as a multilayer substrate, and a polyethylene resin is laminated on the bonding surface of the substrate by melt-extruding the polyethylene resin, A framed process is performed on the joint surface of the above, a polyethylene-based resin is extruded at a temperature of about 300 ° C. to form a melt-extruded film, and the melt-extruded film is pressure-bonded and laminated on the frame-treated base material. And at least a corona discharge treatment and a plasma treatment are applied to the joint surface. A method for producing a laminate, wherein no treatment such as surface oxidation treatment such as heat treatment or ozone treatment is performed. 2. A base material comprising a single-layer polyester film or polypropylene film, a multi-layer base material having a joining surface of polyester or polypropylene, a single layer having a printed joining surface of polyester or polypropylene, or A laminated body in which at least the bonding surface is a polyester or polypropylene, such as a multi-layer substrate, and a polyethylene resin is melt-extruded on the bonding surface of the base material and the polyethylene resin is laminated; The joining surface of the material is subjected to a frame treatment, and a polyethylene-based resin is extruded at a temperature of about 300 ° C. into a melt-extruded film on the frame-treated surface, and the melt-extruded film is pressure-bonded on the frame-treated base material. And a laminated body, wherein at least a corona discharge treatment, plasma Sense, anchor coat treatment, the treatment such as surface oxidation treatment such as ozone treatment is subjected laminate, characterized in that not is. 3. The laminate according to claim 2, wherein the adhesive strength between the base material of the laminate and the melt-extruded film is 120.
gf / 15 mm or more.