Manufacturing method of laminate and manufacturing device of laminate

Abstract

To provide a method for manufacturing a laminate with excellent productivity, and a device for manufacturing a laminate.SOLUTION: There is provided a device for manufacturing a laminate, comprising: first lamination means 33A for supplying a resin film having a surface treatment only on one side as an intermediate resin layer 12, and laminating a first resin layer on a one surface-treated side of the intermediate resin layer 12 while the intermediate resin layer 12 is in an unrolled state without being wound into a roll; surface treatment means for subjecting a surface opposite to the one surface of the intermediate resin layer 12 to surface treatment; and second lamination means 33B for laminating a second resin layer on a surface opposite to the surface-treated surface of the intermediate resin layer 12 after the surface treatment means.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for manufacturing a laminate. [Background technology]

[0002] As a laminate used in conventional packaging bags, Patent Document 1 describes a packaging film in which a base film is laminated to a sealant film mainly composed of polyethylene. Paragraph 0010 of Patent Document 1 suggests that when laminating the sealant film to the base film, the adhesion to the adhesive is increased by a surface treatment such as a corona treatment.

[0003] The composite film used in conventional packaging bags is laminated with a sealant on the inside and a heat-resistant base material on the outside. For example, Patent Document 1 lists nylon film and polyester film as examples of the base film. However, packaging bags containing different types of resins have a problem in that they are difficult to recycle as plastic container packaging.

[0004] In recent years, mono-material containers and packaging that use a single or homogeneous resin have been proposed to facilitate recycling. For example, paragraph 0003 of Patent Document 2 describes the production of packaging bags using a resin film mainly made of polyethylene, due to issues of cost and waste disposal. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-238510 A [Patent Document 2] Patent No. 4536457 Summary of the Invention [Problem to be solved by the invention]

[0006] Since polyethylene has low heat resistance, there is a risk of reduced productivity in producing a mono-material laminate mainly made of polyethylene.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminate manufacturing method and laminate manufacturing apparatus that are excellent in productivity. [Means for solving the problem]

[0008] The present invention includes the following aspects.

[0009] The first aspect is a method for manufacturing a laminate in which a first resin layer and a second resin layer are laminated on both sides of an intermediate resin layer, the method comprising the steps of: supplying a resin film having a surface treatment on only one side as the intermediate resin layer; and, while the intermediate resin layer is unfolded without being wound into a roll, laminating the first resin layer on the one side of the intermediate resin layer having the surface treatment; a surface treatment step applying a surface treatment to the side of the intermediate resin layer opposite the one side; and, after the surface treatment step, laminating the second resin layer on the opposite side of the intermediate resin layer on which the surface treatment has been applied.

[0010] A second aspect is a method for producing a laminate of the first aspect, characterized in that, prior to the first lamination step, it includes a first application step of applying an adhesive to the first resin layer on the side that will be laminated to the one side having the surface treatment of the intermediate resin layer, and a first drying step of drying the adhesive applied in the first application step, and after the first lamination step and the surface treatment step, prior to the second lamination step, it includes a second application step of applying an adhesive to the opposite side of the intermediate resin layer that has been subjected to the surface treatment, and a second drying step of drying the adhesive applied in the second application step.

[0011] A third aspect is characterized in that in the first or second aspect, the intermediate resin layer, the first resin layer and the second resin layer are each a resin film mainly made of polyethylene. A fourth aspect is any one of the first to third aspects, characterized in that the intermediate resin layer is a biaxially oriented polyethylene resin film.

[0012] A fifth aspect is characterized in that in any one of the first to fourth aspects, the first resin layer is a base resin layer, and the second resin layer is a sealant resin layer. A sixth aspect is any one of the first to fifth aspects, characterized in that the surface treatment step is a step of carrying out a corona treatment as the surface treatment.

[0013] A seventh aspect is an apparatus for manufacturing a laminate in which a first resin layer and a second resin layer are laminated on both sides of an intermediate resin layer, the apparatus comprising: a first lamination means for supplying a resin film having a surface treatment on only one side as the intermediate resin layer, and laminating the first resin layer on the one side of the intermediate resin layer having the surface treatment while the intermediate resin layer is unfolded without being wound into a roll, a surface treatment means for applying a surface treatment to the side of the intermediate resin layer opposite to the one side, and a second lamination means for laminating the second resin layer on the opposite side of the intermediate resin layer to which the surface treatment has been applied after the surface treatment means.

[0014] An eighth aspect is a laminate manufacturing apparatus of the seventh aspect, characterized in that it has a first coating means for applying adhesive to the first resin layer on the side that will be laminated to the one side having the surface treatment of the intermediate resin layer prior to the first lamination means, and a first drying means for drying the adhesive applied by the first coating means, and after the first lamination means and the surface treatment means, and prior to the second lamination means, a second coating means for applying adhesive to the opposite side of the intermediate resin layer that has been subjected to the surface treatment, and a second drying means for drying the adhesive applied by the second coating means. Effect of the Invention

[0015] According to the present invention, an intermediate resin layer having a surface treatment on only one side is developed, and then lamination with a first resin layer, surface treatment is performed on the opposite side, and lamination with a second resin layer is performed successively, resulting in excellent productivity.

[0016] In particular, blocking of the intermediate resin layer can be suppressed compared to the case where a polyethylene resin film having surface treatments on both sides is supplied as the intermediate resin layer. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a cross-sectional view showing an example of a laminate. [Diagram 2] FIG. 2 is a configuration diagram showing an example of a laminate manufacturing apparatus. [Diagram 3] FIG. 11 is a partial configuration diagram showing an example in which a surface treatment step is performed before a first lamination step. [Figure 4] FIG. 11 is a partial configuration diagram showing an example in which a surface treatment step is performed after the first lamination step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the present invention will be described based on preferred embodiments.

[0019] 1 has, in this order, a sealant resin layer 11, an intermediate resin layer 12, and a substrate resin layer 13. The intermediate resin layer 12 may be bonded to the sealant resin layer 11 or the substrate resin layer 13 via adhesive layers 14 and 15, respectively.

[0020] In the laminate 10 of the embodiment, a first resin layer and a second resin layer are laminated on both sides of the intermediate resin layer 12, respectively. The sealant resin layer 11 and the base resin layer 13 are examples of the first resin layer and the second resin layer, respectively. More specifically, the base resin layer 13 is a suitable example of the first resin layer and may be the outermost layer of the laminate 10. The sealant resin layer 11 is a suitable example of the second resin layer and may be the innermost layer of the laminate 10.

[0021] An example of a manufacturing device for the laminate 10 is shown in Fig. 2. The sealant resin layer 11, the intermediate resin layer 12, and the substrate resin layer 13 are each supplied as a resin film wound in a roll shape. An example of a supplying means for these is a supplying device that stores the rolled resin film and can pull out the resin film in the length direction from the outer periphery. The sealant resin layer 11, the intermediate resin layer 12, and the substrate resin layer 13 are each treated while being transported in the length direction.

[0022] The manufacturing apparatus for the laminate 10 includes a sealant resin layer supplying means 21, an intermediate resin layer supplying means 22, and a substrate resin layer supplying means 23. The sealant resin layer supplying means 21 is a supplying means for the sealant resin layer 11. The intermediate resin layer supplying means 22 is a supplying means for the intermediate resin layer 12. The substrate resin layer supplying means 23 is a supplying means for the substrate resin layer 13.

[0023] In order to improve and stabilize the adhesive strength when bonding the intermediate resin layer 12 to the sealant resin layer 11 or the substrate resin layer 13, it is preferable to perform a surface treatment on both sides of the intermediate resin layer 12. In addition, the sealant resin layer 11 or the substrate resin layer 13 may also be subjected to a surface treatment on the side to be bonded to the intermediate resin layer 12, if necessary.

[0024] Examples of surface treatments include corona treatment, plasma treatment, and flame treatment. These surface treatments can modify and activate the surface state, such as by generating functional groups on the surface of the resin film. In particular, when the material of the resin film is a synthetic resin with few polar groups, such as a polyolefin resin, affinity can be improved.

[0025] However, when a resin film with surface treatments on both sides is wound into a roll, the treated surfaces may come into contact with each other and stick to each other, which may result in difficulty in unrolling the resin film from the roll into a flat shape, and may cause a blocking problem.

[0026] The intermediate resin layer supplying means 22 supplies a resin film having a surface treatment on only one side as the intermediate resin layer 12. This makes it possible to suppress adhesion and blocking even when the intermediate resin layer 12 having a surface treatment on only one side is wound into a roll. In the roll-shaped intermediate resin layer 12, the surface-treated side may be the inner circumferential side or the outer circumferential side of the roll.

[0027] In the embodiment, the intermediate resin layer 12 is not wound into a roll, and the following steps (1) to (3) are carried out in the state where the intermediate resin layer 12 is unrolled.

[0028] (1) In the first lamination step, a first resin layer is laminated on one surface-treated side of the intermediate resin layer 12. In a specific example, the first resin layer is a base resin layer 13. (2) In the surface treatment step, a surface treatment is performed on the surface opposite to the one surface of the intermediate resin layer 12 . (3) In a second lamination step, a second resin layer is laminated on the surface opposite to the surface-treated surface of the intermediate resin layer 12. In a specific example, the second resin layer is a sealant resin layer 11.

[0029] The second lamination step (3) is carried out after the surface treatment step (2). The surface treatment step (2) can be carried out before or after the first lamination step (1).

[0030] The intermediate resin layer supplying means 22 supplies the intermediate resin layer 12 having a surface treatment only on one side to the first lamination means 33A performing the first lamination step. At this time, the surface-treated one side 12a of the intermediate resin layer 12 is arranged on the side to be laminated with the base resin layer 13.

[0031] The surface of the intermediate resin layer 12 opposite to the surface-treated surface 12a is subjected to a surface treatment by using a surface treatment means 40. The opposite surface 12b that has been subjected to the surface treatment is laminated facing the sealant resin layer 11 in a second lamination means 33B that performs a second lamination step, as shown in FIG.

[0032] 3, when a surface treatment step is performed before the first lamination step, the intermediate resin layer 12 is surface-treated using a surface treatment means 40 before being laminated on the base resin layer 13. The intermediate resin layer 12 to be surface-treated is supplied in a developed state from an intermediate resin layer supply means 22, so that the surface treatment can be performed on the opposite surface 12b.

[0033] 4, in the case where a surface treatment step is performed after the first lamination step, the intermediate resin layer 12 is laminated with the base resin layer 13, and then the surface treatment is performed using a surface treatment means 40. The intermediate resin layer 12 to be surface-treated is transported while being laminated with the base resin layer 13 in an unfolded state, so that the surface treatment can be performed on the opposite surface 12b.

[0034] The laminate 10 manufactured through the first lamination step using the first lamination means 33A and the second lamination step using the second lamination means 33B is wound into a roll by the laminate winding means 20. An example of the laminate winding means 20 is a winding device that rolls the laminate 10 of a resin film or the like.

[0035] In the first lamination step, the base resin layer 13 supplied from the base resin layer supplying means 23 may be a resin film having a surface treatment on only one side. This makes it possible to prevent the base resin layer 13 having a surface treatment on only one side from sticking even when wound into a roll, and to suppress blocking. In the roll-shaped base resin layer 13, the surface-treated side may be the inner periphery side or the outer periphery side of the roll.

[0036] In the second lamination step, the sealant resin layer 11 supplied from the sealant resin layer supplying means 21 may be a resin film having a surface treatment on only one side. This makes it possible to prevent the sealant resin layer 11 having a surface treatment on only one side from sticking even when wound into a roll, and to suppress blocking. In the roll-shaped sealant resin layer 11, the surface-treated side may be the inner circumferential side or the outer circumferential side of the roll.

[0037] 1, the laminate 10 may have adhesive layers 14, 15 interposed between the intermediate resin layer 12 and the sealant resin layer 11 or the base resin layer 13. The adhesive layers 14, 15 may be formed from a composition containing an adhesive component such as an adhesive or an anchor coating agent. The adhesive may be a solvent-based adhesive in which the adhesive component is dissolved or dispersed in a solvent, or a solventless adhesive in which the adhesive component is fluidized without a solvent.

[0038] When laminating the surface-treated side 12a of the intermediate resin layer 12 with the base resin layer 13, an adhesive may be applied to at least one of the side 12a or the base resin layer 13. When laminating the surface-treated opposite side 12b of the intermediate resin layer 12 with the sealant resin layer 11, an adhesive may be applied to at least one of the opposite side 12b or the sealant resin layer 11.

[0039] 2, the first lamination step includes a step of applying an adhesive to the substrate resin layer 13, which will become the first resin layer, and then drying the adhesive. The first application means 31A is an application device that applies an adhesive to the substrate resin layer 13. The first drying means 32A is a drying device that dries the adhesive applied to the substrate resin layer 13. The surface of the substrate resin layer 13 on which the adhesive is applied is on the side that will be laminated to the surface-treated side 12a of the intermediate resin layer 12.

[0040] In the illustrated example, after the first lamination step and the surface treatment step and prior to the second lamination step, a step of applying an adhesive to the intermediate resin layer 12 and then drying the adhesive is included. The second application means 31B is an application device that applies an adhesive to the intermediate resin layer 12. The second drying means 32B is a drying device that dries the adhesive applied to the intermediate resin layer 12. The surface of the intermediate resin layer 12 to which the adhesive is applied is the surface 12b of the intermediate resin layer 12 opposite to the surface treatment.

[0041] The illustrated manufacturing apparatus includes a first unit 30A including a first coating means 31A, a first drying means 32A, and a first laminating means 33A, and a second unit 30B including a second coating means 31B, a second drying means 32B, and a second laminating means 33B. A specific example is a tandem-type laminating device.

[0042] The coating device used for the adhesive layers 14 and 15 is not particularly limited, and examples thereof include a gravure coater, a knife coater, a reverse coater, a bar coater, a spray coater, a spin coater, a die coater, a slit coater, a roll coater, a dip coater, etc. Each of the adhesive layers 14 and 15 may be applied in two or more layers or two or more times in layers.

[0043] The first coating means 31A is provided with an adhesive supplying means 25 having an adhesive for the adhesive layer 15. The second coating means 31B is provided with an adhesive supplying means 24 having an adhesive for the adhesive layer 14. The adhesive supplying means 24, 25 are not particularly limited, and may be an open system supplying device such as a pan or a liquid tank, or a closed system supplying device such as a die or a nozzle.

[0044] Prior to the first lamination step, it is optional whether to form an adhesive layer 15 on the first resin layer or to form an adhesive layer 15 on the intermediate resin layer. Furthermore, prior to the second lamination step, it is optional whether to form an adhesive layer 14 on the second resin layer or to form an adhesive layer 14 on the intermediate resin layer. Therefore, when the adhesive layers 14 and 15 are each formed once on the resin film, the following four methods (i) to (iv) can be mentioned.

[0045] (i) In a first lamination step, an adhesive layer 15 is formed on a first resin layer, and then the first resin layer and an intermediate resin layer are laminated together; in a second lamination step, an adhesive layer 14 is formed on the intermediate resin layer, and then the second resin layer and the intermediate resin layer are laminated together.

[0046] (ii) In a first lamination step, an adhesive layer 15 is formed on the intermediate resin layer, and then the first resin layer and the intermediate resin layer are laminated together; in a second lamination step, an adhesive layer 14 is formed on the intermediate resin layer, and then the second resin layer and the intermediate resin layer are laminated together.

[0047] (iii) In a first lamination step, an adhesive layer 15 is formed on the first resin layer, and then the first resin layer and an intermediate resin layer are laminated together. In a second lamination step, an adhesive layer 14 is formed on the second resin layer, and then the second resin layer and an intermediate resin layer are laminated together.

[0048] (iv) In a first lamination step, an adhesive layer 15 is formed on the intermediate resin layer, and then the first resin layer and the intermediate resin layer are laminated together, and in a second lamination step, an adhesive layer 14 is formed on the second resin layer, and then the second resin layer and the intermediate resin layer are laminated together.

[0049] 2 corresponds to the above (i) in which the first resin layer is the substrate resin layer 13 and the second resin layer is the sealant resin layer 11. When the second resin layer is the sealant resin layer 11, it is preferable that the first resin layer is the substrate resin layer 13.

[0050] Since the sealant resin layer 11 has low heat resistance, it is preferable to suppress the influence of the heating by the second drying means 32B on the sealant resin layer 11. From this viewpoint, it is preferable to use the above method (i) or (ii) to form the adhesive layer 14 on the intermediate resin layer 12 in the second lamination step, and then laminate the sealant resin layer 11 and the intermediate resin layer 12 together.

[0051] Although not particularly shown, in the above cases (ii) or (iv), when forming the adhesive layer 15 on the intermediate resin layer 12, an adhesive is applied to the surface-treated one side 12a of the intermediate resin layer 12. Furthermore, the adhesive applied to the intermediate resin layer 12 by the first application means 31A may be dried by the first drying means 32A.

[0052] Although not particularly shown, in the above cases (iii) or (iv), when forming the adhesive layer 14 on the second resin layer, an adhesive is applied to the side of the second resin layer that is to be laminated on the opposite surface 12b of the intermediate resin layer 12. Furthermore, the adhesive applied to the second resin layer by the second application means 31B may be dried by the second drying means 32B.

[0053] In the case of (iii) or (iv) above, the step of laminating the first resin layer on one side of the intermediate resin layer 12 via the adhesive layer 15, and the step of laminating the second resin layer on the opposite side of the intermediate resin layer 12 via the adhesive layer 14 can be performed in any order. In other words, the first lamination step and the second lamination step can be performed in any order. Furthermore, the first application step and the second application step can be performed in any order, and the first drying step and the second drying step can be performed in any order.

[0054] The intermediate resin layer, the first resin layer and the second resin layer may each be a resin film mainly made of polyolefin, or may each be a resin film mainly made of polyethylene. Examples of polyolefin-based resins include polyethylene-based resins and polypropylene-based resins.

[0055] In a resin film mainly made of polyolefin, the proportion of polyolefin-based resin, in total of one or more types, is preferably 50% by weight or more, more preferably 80% by weight or more, and even more preferably 90% by weight or more. Furthermore, in a resin film mainly made of polyethylene, the proportion of polyethylene-based resin, in total of one or more types, is preferably 50% by weight or more, more preferably 80% by weight or more, and even more preferably 90% by weight or more.

[0056] The polyethylene resin used in the resin film may be a homopolymer of ethylene or a copolymer mainly composed of ethylene. Examples of monomers (comonomers) other than ethylene include one or more of α-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, acrylic acid, maleic acid, and maleic anhydride. The polyethylene resin may be a modified resin such as a carboxylic acid anhydride modified resin. When the polyethylene resin is copolymerized with a monomer having an ester group such as vinyl acetate, a part of the ester group may be saponified to form a copolymer containing vinyl alcohol.

[0057] The proportion of ethylene in the constituent monomers of the polyethylene-based resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. Ethylene or a comonomer may be a compound derived from a fossil resource such as petroleum, or may be a compound derived from biomass such as plants. The resin contained in the polyethylene-based resin layer may be only a polyethylene-based resin, or may contain other resins. At least a part of the polyethylene-based resin may contain a recycled polyethylene-based resin.

[0058] The resin film included in the laminate 10 may contain additives other than resin. The additives are not particularly limited, but examples thereof include antioxidants, lubricants, antiblocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, and compatibilizers. The additives may be components that are compatible with the resin, or components that are not compatible with the resin.

[0059] The sealant resin layer 11 is preferably formed from a non-oriented polyethylene resin. Specific examples of materials for forming the sealant resin layer 11 include linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE). The thickness of the sealant resin layer 11 is not particularly limited, but may be, for example, about 60 to 180 μm. The sealant resin layer 11 may be a single layer, or may have a multi-layer laminate structure formed by coextrusion or the like.

[0060] Specific examples of materials for forming the intermediate resin layer 12 or the base resin layer 13 include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), etc. The thickness of the intermediate resin layer 12 or the base resin layer 13 is not particularly limited, but may be, for example, about 10 to 50 μm.

[0061] The intermediate resin layer 12 or the base resin layer 13 is preferably formed from a stretched polyolefin resin. The intermediate resin layer 12 may be uniaxially stretched or biaxially stretched. The base resin layer 13 may be uniaxially stretched or biaxially stretched. The intermediate resin layer 12 adjacent to the sealant resin layer 11 may be biaxially stretched.

[0062] The stretching direction, stretching ratio, etc. of the stretched resin film are not particularly limited, but the film may be stretched in either or both of the machine direction (MD) and the transverse direction (TD). The stretching ratio is preferably within the range of 2 to 10 in both the MD and TD directions. The stretching ratio in the MD direction and the stretching ratio in the TD direction may be equal to or different from each other.

[0063] The number of polyethylene-based resin layers included in the laminate 10 may be one each of the intermediate resin layer, the first resin layer, and the second resin layer (three layers in total), or may be four or more. In each polyethylene-based resin layer, the proportion of the polyethylene-based resin in the total weight of the polyethylene-based resin layer or in the entire resin component is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight.

[0064] The adhesive layers 14, 15 may be formed from an adhesive or an anchor coating agent. Materials for forming the adhesive layers 14, 15 are not particularly limited, but include urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organic titanium compounds such as titanium alkoxide. The thickness of the adhesive layers 14, 15 may be, for example, about 0.1 to 10 μm, about 1 to 6 μm, or about 3 to 4 μm.

[0065] To impart barrier properties to the laminate 10, a metal such as aluminum or an inorganic compound such as silica or alumina may be laminated in a thin film form. For example, a barrier layer made of the above-mentioned metal or inorganic compound may be formed by vapor deposition, plating, or the like on at least one surface of the intermediate resin layer 12 and / or the substrate resin layer 13.

[0066] The laminate 10 may have a printed layer (not shown). For example, a printed layer may be laminated on the inner or outer surface of the intermediate resin layer 12 and / or the base resin layer 13. The printed layer can be formed by printing ink in a solid or patterned manner using a printing method such as gravure printing, letterpress printing, offset printing, screen printing, or inkjet printing. The thickness of the printed layer is not particularly limited, but may be about 0.5 to 10 μm.

[0067] The printed layer may be formed on the entire surface of the laminate 10, or may be formed on a portion of the surface of the laminate 10. Two or more printed layers may be superimposed. The printed layer may be formed using a solvent-based ink, or may be formed without a solvent using EB printing. The solvent-based ink may contain a solvent such as water, an organic solvent, or vegetable oil. After printing using a solvent, the ink can be dried by volatilization of the solvent or hardening of the ink. In order to promote drying of the ink, heating, ultraviolet irradiation, etc. may be performed. If the ink is solvent-free, printing without heating is also possible.

[0068] For mono-material container packaging using polyethylene-based resins, it is preferable that the total amount of polyethylene-based resins is 80% by weight or more and the total amount of materials other than polyethylene-based resins is 20% by weight or less, relative to the total weight of the laminate 10, and it is more preferable that the total amount of polyethylene-based resins is 90% by weight or more and the total amount of materials other than polyethylene-based resins is 10% by weight or less.

[0069] The laminate 10 can be used to produce a packaging bag. At least one member of the packaging bag may be formed from the laminate 10. The use of the packaging bag is not particularly limited, and may be disposable, refillable, storage, or for storing items, but the packaging bag is suitable for use in sealing liquids, and is particularly suitable for use in refilling the contents once or multiple times into a main container used when consuming the contents.

[0070] Examples of packaging formed using the laminate 10 include packaging bags such as pouches and bags, tubes, containers, sleeve packaging, strip packaging, lids, etc. Specific examples of packaging bags include, but are not limited to, three-sided sealed bags, four-sided sealed bags, pillow bags, flat bags, gusset bags, standing pouches, etc. When the laminate 10 is a flexible laminate film, a flexible packaging can be formed.

[0071] The packaging bag may have a filling port, a pouring port, etc. For example, the pouring port may be formed in a shape that protrudes thinly from the top or a corner of the packaging bag by molding the laminate 10. The packaging bag may be a spout type made of a member molded separately from the laminate 10.

[0072] The packaging bag may have a portion to be cut at the opening portion or the outer periphery. The portion to be cut may have a structure processed in the thickness direction of the film, such as a perforation, a notch, a half-cut groove, etc. The cut portion may have an indication such as an arrow, a line, a dot, etc., printed thereon.

[0073] The dimensions of the package are not particularly limited. For example, when used as a refill container, the height in the vertical direction is about 100 to 500 mm, the width in the horizontal direction is about 70 to 300 mm, and the filling amount is about 100 cm 3 ~5000cm 3 The state of the contents may be fluid such as liquid, powder, or granules, or solid such as an article. The type of contents may be, but is not limited to, detergent, medicine, cosmetics, pharmaceuticals, beverages, seasonings, ink, paint, fuel, etc.

[0074] Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. Modifications include addition, substitution, omission, and other changes of components. EXAMPLES

[0075] The present invention will be explained more specifically below with reference to examples, but the present invention is not limited to these examples.

[0076] <Description of manufacturing method> In manufacturing method A (pre-treatment on one side, manufacturing in one step), a laminate was manufactured by the following (A-1) to (A-3). In manufacturing method A, an intermediate resin layer which has been subjected to a corona treatment on only one side is used.

[0077] (A-1) An adhesive was applied to one side of the base resin layer unrolled from the roll and dried, and then the adhesive layer of the base resin layer was laminated against the corona-treated surface of an intermediate resin layer, only one side of which had been corona-treated. (A-2) While the laminate film obtained in (A-1) above was kept in an unfolded state, the intermediate resin layer was subjected to a corona treatment on the surface opposite to the surface on which the base resin layer was laminated. (A-3) While the laminate film obtained in (A-2) above is in an unfolded state, an adhesive is applied to the corona-treated surface of the intermediate resin layer, and after drying, the adhesive layer of the intermediate resin layer and the sealant resin layer are laminated facing each other, and the obtained laminate is wound up into a roll.

[0078] In manufacturing method B (pre-treatment on both sides, manufacturing in one step), a laminate was manufactured by the following (B-1) to (B-2). In manufacturing method B, an intermediate resin layer that has been subjected to corona treatment on both sides is used.

[0079] (B-1) An adhesive was applied to one side of the base resin layer unrolled from the roll and dried, and then the adhesive layer of the base resin layer was laminated against one side of an intermediate resin layer that had been corona-treated on both sides. (B-2) While the laminate film obtained in (B-1) above is in an unfolded state, an adhesive is applied to the corona-treated surface of the intermediate resin layer on the side opposite to the side on which the base resin layer is laminated, and after drying, the adhesive layer of the intermediate resin layer and the sealant resin layer are laminated facing each other, and the obtained laminate is wound up into a roll.

[0080] In manufacturing method C (pre-treatment on one side, manufacturing in three steps), a laminate was manufactured by the following (C-1) to (C-3). In manufacturing method C, an intermediate resin layer that has been subjected to corona treatment on only one side is used, and after lamination or corona treatment is completed, the film is wound into a roll.

[0081] (C-1) An adhesive was applied to one side of the base resin layer unrolled from the roll, and after drying, the adhesive layer of the base resin layer and the corona-treated surface of an intermediate resin layer, which had been corona-treated on only one side, were laminated facing each other and wound into a roll. (C-2) The laminate film obtained in (C-1) above was unrolled, and the intermediate resin layer was subjected to a corona treatment on the surface opposite to the surface on which the base resin layer was laminated, and then wound into a roll. (C-3) The laminate film obtained in (C-2) above is unrolled, and an adhesive is applied to the corona-treated surface of the intermediate resin layer. After drying, the adhesive layer of the intermediate resin layer and the sealant resin layer are laminated facing each other, and the obtained laminate is wound into a roll.

[0082] <Manufacture of Laminate> In Example 1, a laminate of MDO-PE 25 μm / BO-LLDPE 25 μm / LLDPE 130 μm was produced by Production Method A (pre-treatment on one side, production in one step). In Example 2, a laminate of MDO-PE 25 μm / MDO-PE 25 μm / LLDPE 130 μm was produced by Production Method A (pre-treatment on one side, production in one step).

[0083] In Comparative Example 1, a laminate of PET 12 μm / Ny 12 μm / PE 120 μm was produced by Production Method B (pre-treatment on both sides, production in one step). In Comparative Example 2, a laminate of MDO-PE 25 μm / BO-LLDPE 25 μm / LLDPE 130 μm was produced by Production Method C (pre-treatment on one side, production in three steps). In Comparative Example 3, a laminate of MDO-PE 25 μm / BO-LLDPE 25 μm / LLDPE 130 μm was produced by Production Method B (pre-treatment on both sides, production in one step).

[0084] The layer structures of the above laminates are shown in the order of base resin layer / intermediate resin layer / sealant resin layer. In these layer structures, PE stands for polyethylene, LLDPE stands for linear low-density polyethylene, Ny stands for nylon, PET stands for polyethylene terephthalate, MDO- stands for uniaxial orientation, BO- stands for biaxial orientation, and the values ​​in μm are the thicknesses of the resin films.

[0085] <Recyclability evaluation> The recyclability of the laminate was evaluated as good (◯) when the resin film contained in the laminate was only PE, and as bad (×) when a resin film other than PP or PE was contained.

[0086] <Productivity evaluation> The productivity of the laminate was evaluated as one process from unrolling the resin film from the roll, applying the required processing, and winding it up into a roll, and was evaluated as good (○) when this was done once and bad (×) when this was done three times.

[0087] <Evaluation of processing suitability> The processability was evaluated as good (◯) if no blocking occurred when the intermediate resin layer was unrolled from the roll, and as bad (×) if blocking occurred.

[0088] <Evaluation Results> The evaluation results of Example 1 were: recyclability: ◯, productivity: ◯, and processability: ◯. The evaluation results of Example 2 were as follows: recyclability: ◯, productivity: ◯, and processability: ◯. The evaluation results of Comparative Example 1 were: recyclability: ×, productivity: ◯, and processability: ◯. The evaluation results of Comparative Example 2 were: recyclability: ◯, productivity: ×, and processability: ◯. The evaluation results for Comparative Example 3 were: recyclability: ◯, productivity: ◯, and processability: ×. [Explanation of symbols]

[0089] 10... laminate, 11... sealant resin layer, 12... intermediate resin layer, 12a... one side having surface treatment, 12b... opposite side having surface treatment applied, 13... substrate resin layer, 14, 15... adhesive layer, 20... laminate winding means, 21... sealant resin layer supplying means, 22... intermediate resin layer supplying means, 23... substrate resin layer supplying means, 24, 25... adhesive supplying means, 30A... first unit, 30B... second unit, 31A... first application means, 31B... second application means, 32A... first drying means, 32B... second drying means, 33A... first lamination means, 33B... second lamination means, 40... surface treatment means.

Claims

1. A method for producing a laminate in which a first resin layer and a second resin layer are laminated on both sides of an intermediate resin layer, the method comprising the steps of: As the intermediate resin layer, a resin film having a surface treatment on only one side is provided; When the intermediate resin layer is unwound into a roll, a first lamination step of laminating the first resin layer on the one surface of the intermediate resin layer having the surface treatment; a surface treatment step of performing a surface treatment on a surface opposite to the one surface of the intermediate resin layer; A method for producing a laminate, comprising: a second lamination step of laminating the second resin layer on the opposite side of the intermediate resin layer to the side on which the surface treatment has been applied, after the surface treatment step.

2. a first coating step of coating an adhesive on the first resin layer on the side of the intermediate resin layer that is to be laminated on the one surface having the surface treatment, and a first drying step of drying the adhesive coated in the first coating step, prior to the first lamination step; 2. The method for manufacturing a laminate according to claim 1, further comprising, after the first lamination step and the surface treatment step and prior to the second lamination step, a second application step of applying an adhesive to the opposite side of the intermediate resin layer to which the surface treatment has been applied, and a second drying step of drying the adhesive applied in the second application step.

3. 3. The method for producing a laminate according to claim 1, wherein the intermediate resin layer, the first resin layer and the second resin layer are each a resin film mainly composed of polyethylene.

4. 3. The method for producing a laminate according to claim 1, wherein the intermediate resin layer is a biaxially oriented polyethylene resin film.

5. 3. The method for producing a laminate according to claim 1, wherein the first resin layer is a base resin layer, and the second resin layer is a sealant resin layer.

6. 3. The method for producing a laminate according to claim 1, wherein the surface treatment step is a corona treatment step.

7. An apparatus for manufacturing a laminate in which a first resin layer and a second resin layer are laminated on both sides of an intermediate resin layer, the apparatus comprising: As the intermediate resin layer, a resin film having a surface treatment on only one side is provided; When the intermediate resin layer is unwound into a roll, a first lamination means for laminating the first resin layer on the one surface of the intermediate resin layer having the surface treatment; a surface treatment means for performing a surface treatment on a surface opposite to the one surface of the intermediate resin layer; and a second lamination means for laminating the second resin layer on the opposite side of the intermediate resin layer that has been surface-treated after the surface treatment means.

8. a first coating means for coating an adhesive on the first resin layer on the side of the intermediate resin layer having the surface treatment prior to the first lamination means, and a first drying means for drying the adhesive coated by the first coating means; The laminate manufacturing apparatus according to claim 7, further comprising: a second coating means for coating an adhesive on the opposite side of the intermediate resin layer to which the surface treatment has been applied, after the first lamination means and the surface treatment means, and before the second lamination means; and a second drying means for drying the adhesive applied by the second coating means.

Images