JPH052948U - Laminated film - Google Patents

Abstract

(57) [Summary] [Purpose] While maintaining the flexibility of the laminated film, it has moldability, heat seal strength, transparency, adhesion with polypropylene, heat pressure resistance, scratch resistance, blocking resistance, etc. Another object is to obtain a laminated film having a better low-temperature heat-sealing property and easily subjected to thermocompression bonding. [Structure] Ethylene-propylene-butene-1, a composite biaxially oriented polypropylene film having a heat-sensitive adhesive substance layer made of a terpolymer is printed on the heat-sensitive adhesive substance layer surface, and then the same print surface is separately printed. Created ethylene
A heat-sealable polyolefin film composed of propylene-butene-1 and a terpolymer is thermocompression bonded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a laminated film which has a printed surface protected and is manufactured without using any adhesive or solvent.

[0002]

[Prior Art]

 The present inventors did not use adhesives or solvents at all during the manufacturing process, and the process was greatly simplified so that the needs of small lots and users of a wide variety of products could be quickly dealt with without loss. Japanese Patent Application No. 54-134675 is provided as a method for producing a laminated film which is excellent in low-temperature heat sealability while the printed surface of the film is completely protected.

The content thereof is the above-mentioned heat-sensitive adhesive of a composite biaxially oriented polypropylene film having a heat-sensitive adhesive material layer surface composed of an ethylene-propylene random copolymer or a propylene-1-butene random copolymer or a mixture thereof. Is printed on the surface of the conductive material layer, and then an ethylene-propylene random copolymer or a propylene-1-butene random copolymer or a mixture thereof prepared separately on the printed surface is used as an adhesive, which is a heat-sealable polyolefin film. A method for producing a laminated film, which comprises thermocompression bonding without using a solvent.

[0004]

[Problems to be solved by the device]

 The present inventors have moldability, heat seal strength, transparency, adhesiveness with polypropylene, heat pressure resistance, scratch resistance, blocking resistance, etc., while maintaining the elasticity of the laminate film, and As a result of earnest research, the present invention has been completed with the aim of obtaining a laminated film with good low-temperature heat-sealing properties and easy thermocompression bonding.

[0005]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a composite biaxially oriented polypropylene film having a heat-sensitive adhesive substance layer composed of ethylene-propylene-butene-1, ternary terpolymer, on the heat-sensitive adhesive substance layer surface. It is characterized in that printing is carried out, and then an easily heat-sealable polyolefin film made of an ethylene-propylene-butene-1, terpolymer separately prepared is thermocompression-bonded to the printing surface.

[0006]

[Action]

 Since the composition of the heat-sensitive adhesive material layer and the easily heat-sealable polyolefin-based film is ethylene-propylene-butene-1, a ternary copolymer, the conditions such as pressure, temperature, speed, etc. should be satisfied during thermocompression bonding. It will be easier. That is, the temperature can be lower and the speed can be higher, which stabilizes the quality and improves the production efficiency.

[0007]

【Example】

 Hereinafter, the present invention will be described based on specific embodiments.

The heat-sensitive adhesive material in the present invention comprises ethylene-propylene-butene-1, a terpolymer. The ternary copolymer is composed of, for example, 3 mol% ethylene, butene-1, and 2 mol% ternary random polypropylene.

The polypropylene film means a propylene homopolymer having a boiling n-heptane extraction residue of 90% or more, or an ethylene content of 5 mol% or less, and a heat-sensitive adhesive material layer or an easily heat-sealable polyolefin-based film. An ethylene-propylene copolymer having a melting point higher than that of the substance used for the film, or a mixture of a propylene homopolymer and a propylene-α olefin copolymer having a total propylene content of 95 mol% or more. It is a film consisting of.

The composite biaxially oriented polypropylene film is formed by first longitudinally stretching an extruded polypropylene film, and then melt-extruding a heat-sensitive adhesive layer made of ethylene-propylene-butene-1, a terpolymer, and laminating it. It is made by laminating in film form and then subjecting it to weft stretching.

The printing ink may be a commonly used polyolefin ink, but among them, the ink having a relatively excellent scratch resistance is more likely to be a fan-der ink when it is thermocompression-bonded with the easily heat-sealing polyolefin film.・ Anchor effect can be expected in addition to the Waals force, and good results can be obtained.

The easily heat-sealable polyolefin-based film that protects the printed surface is made of an ethylene-propylene-1-butene terpolymer as in the heat-sensitive adhesive material layer, for example, ethylene 3 mol% butene-1,2. Consisting of mol% ternary random polypropylene.

Regarding the thermocompression bonding of the easily heat-sealable polyolefin film, it is necessary to protect the printed portion of the heat-sensitive adhesive material layer surface, to give the film strength and elasticity and to form a low-temperature easy heat-seal layer. Although various methods are conceivable as the thermocompression bonding method, any method may be used, but it is usually sufficient to use a thermocompression bonding part formed of a heated pinch roll. For example, one of the pinch rolls is a metal roll heated to 80 to 150 ° C, preferably 100 to 140 ° C, and the other is a rubber roll coated with a heat-resistant, non-adhesive coating such as Teflon (registered trademark). Is used at a temperature of 50 to 100 ° C., and the polypropylene layer is brought into contact with the heated metal roll side at a linear pressure of 5 kg / cm or more, preferably 20 kg / cm or more, to obtain a smooth laminated film.

The laminated film is produced by appropriately slitting the composite biaxially oriented polypropylene film and printing it. In this case, the printing is performed on the heat-sensitive adhesive material layer, whereby a printed composite film is completed. Thereafter, a separately prepared heat-sealable polyolefin film is laminated on the printed surface of the printed composite film. Such laminating means is carried out by passing both of them through the thermocompression-bonded portion formed by the heated metal roll and rubber roll as described above.

FIG. 1 is an explanatory view of an apparatus for manufacturing a laminated film of the present invention. The apparatus is a gravure for printing a feeding section 1 of a polypropylene film a and a heat-sensitive adhesive layer c of the film a. A printing unit 4, a drying oven 5 for drying the printed film a, a feeding unit 2 for the easily heat-sealable polyolefin film e, and a thermocompression bonding unit 10 for thermocompression bonding between the film a and the film e. , A laminate film winding unit 3.

That is, the composite biaxially-stretched polypropylene film a is unwound from the feeding section 1, printed in the gravure printing section 4 on the heat-sensitive adhesive layer c of the film a, and dried in the drying oven 5. It Then, the easily heat-sealing polyolefin film e rolled out from the other feeding section 2 is fed to the thermocompression bonding section 10 in a state of being overlaid so as to be in contact with the heat-sensitive adhesive substance layer c of the film a, and is fed to the thermocompression bonding section 10. The heat-pressible polyolefin film e is thermocompression-bonded so that a is on the heated metal roll 6 side and on the Teflon-coated rubber roll 7 side. The thermocompression-bonded laminate film is wound on the winding unit 3.

FIG. 2 is a sectional view showing a structure of the composite biaxially oriented polypropylene film a of the present invention and a state in which a printing layer d is printed on the heat-sensitive adhesive material layer c of the film a. That is, the composite biaxially-stretched polypropylene film a is obtained by melt-extruding a heat-sensitive adhesive material layer composed of ethylene-propylene-butene-1, a ternary copolymer on one surface of the polypropylene film c, and laminating the film. It has a laminated structure.

FIG. 3 shows a cross section of the laminate film, which shows a heat-sealable polyolefin film e which is thermocompression-laminated on the printed layer d.

Further, since low-temperature heat sealability is imparted, deterioration of film rigidity, moldability, heat seal strength, transparency, adhesiveness with polypropylene, heat pressure resistance, scratch resistance, blocking resistance, etc. is not exerted. Within the range, a small amount of polyethylene or a polyethylene-based resin such as ethylene-propylene random copolymer may be mixed with the ethylene-propylene-butene-1, terpolymer.

[0020]

Example 1 A heat-sealable polyolefin film having an average thickness of 25 μ and having an average thickness of 25 μ was prepared by a T-die method using a 90 mm extruder, and the composition was made of ternary random polypropylene containing 3 mol% of ethylene and 2 mol% of butene-1. Manufactured. The die temperature was set to 270 ° C. and the chill roll temperature was set to 50 ° C., and the film was wound at a speed of 30 m / min. The rolled-up roll-shaped polyolefin film was set in the feeding section 1 of the laminate film manufacturing apparatus.

Separately, M. I. A heat-sensitive adhesive material layer made of ternary random polypropylene containing 3 mol% of ethylene and 12 mol% of butene in a polypropylene film that was longitudinally stretched 5 times after extruding a T-die using polypropylene resin of 1 and 6 Was melt-extruded and laminated, and then weft-stretched 8 times to prepare a composite biaxially-stretched polypropylene film. The polypropylene layer of the composite film had a thickness of 17μ and the heat-sensitive adhesive layer had a thickness of 3μ. This composite film was slit to a usable width of 600 mm, wound on a paper tube, and then set in the feeding section 1 of the above-mentioned laminated film manufacturing apparatus.

In the laminated film manufacturing apparatus, the composite biaxially stretched polypropylene film a and the easily heat-sealable polyolefin film e are unwound from the feeding portions 1 and 2, respectively, and the composite film a is a heat-sensitive adhesive layer. After passing through the gravure printing section 4 to be printed, it is dried by the drying furnace 5 and supplied to the heating metal roll 6 side of the thermocompression bonding section 10. The polyolefin film e unwound from the feeding section 2 is also supplied so as to be on the Teflon-coated rubber roll 7 side of the thermocompression bonding section 10, and the film e is applied to the heat-sensitive adhesive layer c of the composite film a. Layered so that they touch each other.

The surface temperature of the heating metal roll 6 was set to 130 ° C., the pinch pressure of the rubber roll 7 was set to 30 kg / cm, and the laminate film R1 was manufactured by continuous thermocompression bonding at a speed of 120 m / min.

[0024]

Example 2 In Example 1, as a raw material resin for the easily heat-sealable polyolefin film, ethylene 3 mol%, butene-1, 2 mol% ethylene-propylene-butene-1, terpolymer 100 A mixture of 10 parts by weight of low-density polyethylene having a density of 0.920 in parts by weight was used, and as a raw material resin for the heat-sensitive adhesive layer, 2.5 mol% of ethylene, butene-1, and 1.5 mol% According to the same manner as in Example 1, except that 10 parts by weight of low-density polyethylene having a density of 0.920 was mixed with 100 parts by weight of ethylene-propylene-butene-1, terpolymer, a laminate film R2 was prepared. It was manufactured.

Data (n = 20) of the measured values of the laminate strength and the seal strength of the laminate films R1 and R2 are shown in Table 1 as average values X1 and X2.

[0026]

[Table 1]

[0027]

[Effect of the device]

 The laminated film according to the present invention uses the ethylene-propylene-butene-1, ternary copolymer as the heat-sensitive adhesive material layer and the easily heat-sealable polyolefin film, so that no adhesive or solvent is used during the manufacturing process. Without using it, the process is greatly simplified and it is possible to quickly respond to the demands of small lots and users of a wide variety of products without loss.While maintaining the flexibility of the laminate film, the moldability, heat seal strength, transparency, It has adhesiveness with polypropylene, thermocompression, scratch resistance, blocking resistance, etc., and has better low-temperature heat sealability.

[Brief description of drawings]

FIG. 1 is an explanatory view of an apparatus for manufacturing a laminated film of the present invention.

FIG. 2 is an explanatory diagram in which printing is performed on a heat-sensitive adhesive material layer surface of a composite biaxially oriented polypropylene film.

FIG. 3 is an explanatory view of the laminated film of the present invention.

[Explanation of sign]

 1 Feeding part 3 Winding part 3 4 Gravure printing part 10 Thermocompression bonding part

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Claims (1)

[Claims for utility model registration] [Claim 1] Ethylene-propylene-butene-1, 3
The composite biaxially stretched polypropylene film having a heat-sensitive adhesive substance layer made of an original copolymer is printed on the heat-sensitive adhesive substance layer side, and then ethylene-propylene-butene-1, ternary prepared separately on the print side. A laminated film, which is obtained by thermocompression bonding an easily heat-sealing polyolefin film made of a copolymer.