KR102457345B1 - Method for manufacturing retort pouch using laser marking - Google Patents

Abstract

Disclosed is a manufacturing method of a retort pouch using laser marking comprises: a step of sequentially stacking and laminating a polyethylene terephthalate (PET) film layer, an aluminum foil (Al foil) layer, and a nylon (NY) film layer to manufacture to manufacture an outer multi-layer film; a step of forming a cutting line on the NY film layer on a cutting line formed area of the outer multi-layer film through a laser marking method; and a step of manufacturing a multi-film for a pouch by laminating a non-stretched polypropylene (CPP) film layer on the NY film layer. Therefore, the cutting line is formed in the NY film layer to improve ease of cutting of a retort pouch.

Description

Manufacturing method of a retort pouch using laser marking

The present invention (Disclosure) relates to a method of manufacturing a retort pouch using laser marking, and specifically, a polyethylene terephthalate (PET) film layer, an aluminum foil layer and a nylon (NY) film layer are sequentially laminated and After laminating to prepare an outer multilayer film, and forming a perforated line on the nylon (NY) film layer by a laser marking method, laminating a non-stretched polypropylene (CPP) film layer to prepare a multilayer film for pouches, the perforated line is a nylon film It relates to a method of manufacturing a retort pouch using a laser marking that can improve the ease of cutting the retort pouch by forming in a layer.

Herein, background information related to the present invention is provided, which does not necessarily imply prior art (This section provides background information related to the present disclosure which is not necessarily prior art).

The most important purpose of a pouch used as a packaging material for food is to protect and preserve the contents that are contained and packaged. , a process of sealing or sealing by sealing against the packaging material is required.

In this case, the pouch should have excellent gas permeability such as oxygen and moisture permeability such as humidity, which is the most important factor in preventing deterioration of contents.

In addition, since the pouch has a function of protecting and preserving the contents as well as the convenience of taking out the contents, that is, the ease of opening, etc.

Conventional pouches usually have a rectangular or square shape, and can be manufactured by filling and sealing the contents between two layers of packaging paper having fusion portions provided on the side, upper, lower, etc.

Here, a cut portion such as a saw blade shape may be formed at both ends of the fusion portion of the upper and lower portions, and a plurality of cut grooves are formed in the cut portion, so that a person who wants to ingest (drink) the contents of the pouch can easily do it by hand. allow it to be cut.

The cutting groove as described above has a structure that facilitates the cutting of the pouch, and may be formed so that it starts torn from the cutting groove, which is the weakest part, and is torn in the vertical direction of a straight line to which force is applied, that is, in the longitudinal direction of the pouch.

On the other hand, according to the Korean Food Standards Codex, retort foods are prepared, processed, or cooked in a single-layer plastic film or metal foil, or in a container molded into a pouch or other shape by adhering them in multiple layers, such as curry, high-rice, etc. Foods such as soups, soups, stews, soups, meat, fish meat, and processed foods are filled and sealed and pressurized, heated, sterilized or sterilized. It is defined as being instantiated so that it is high and easy to carry and transport, and such food for retort can be filled and sealed in a retort pouch.

When a cutting groove is formed on the surface of the retort pouch as described above, when cutting along the grain in a straight direction, it is easily torn or is not easily torn. When opening the package, the contents are not spilled or the opening is not completely torn, so it is very inconvenient, such as interfering with the intake of food for retort. ), such as not being smooth, there was a problem that the tearability was inferior.

1. Korea Patent Publication No. 10-1065174 (Registered on September 8, 2011)

The present invention (Disclosure) manufactures an outer multilayer film by sequentially laminating and laminating a polyethylene terephthalate (PET) film layer, an aluminum foil layer and a nylon (NY) film layer, and a laser marking method for nylon (NY) ) After forming a perforated line on the film layer, a non-stretched polypropylene (CPP) film layer is laminated to prepare a multilayer film for pouches. An object of the present invention is to provide a method for manufacturing a retort pouch using

Herein, a general summary of the present invention is provided, which should not be construed as limiting the scope of the present invention (This section provides a general summary of the disclosure and is not a comprehensive disclosure of its full scope or all of its features).

In order to solve the above problems, a method of manufacturing a retort pouch using laser marking according to any one aspect of various aspects describing the present invention is a polyethylene terephthalate (PET) film layer, aluminum foil (Al foil) ) by sequentially laminating and laminating a layer and a nylon (NY) film layer to prepare an outer multilayer film; forming a perforation line in the nylon (NY) film layer by a laser marking method in the perforation line formation area of the outer multilayer film; and laminating a non-stretched polypropylene (CPP) film layer on the nylon (NY) film layer to prepare a multilayer film for a pouch.

In the method of manufacturing a retort pouch using laser marking according to an aspect of the present invention, the manufacturing of the outer multilayer film may be laminated by a dry laminating method.

In the method of manufacturing a retort pouch using laser marking according to an aspect of the invention, the step of forming the perforated line may form the perforated line in a continuous line form or a dotted line form.

In the method of manufacturing a retort pouch using laser marking according to an aspect of the present invention, the manufacturing of the multilayer film for the pouch may be laminated by a dry laminating method.

In the method of manufacturing a retort pouch using laser marking according to an aspect of the invention, after manufacturing the multilayer film for the pouch, processing the retort pouch form using the multilayer film for the pouch; And after filling the food for retort inside the processed retort pouch form, sealing the entrance of the retort pouch form to manufacture a retort pouch; may further include.

According to the present invention, an outer multilayer film is manufactured by sequentially laminating and laminating a polyethylene terephthalate (PET) film layer, an aluminum foil layer, and a nylon (NY) film layer, and a nylon (NY) film using a laser marking method. After forming a perforation line on the layer, by laminating a non-stretched polypropylene (CPP) film layer to prepare a multilayer film for a pouch, the perforation line is formed on the nylon film layer to improve the ease of perforation of the retort pouch.

1 is a flowchart showing a process of manufacturing a retort pouch using laser marking according to an embodiment of the present invention;
2 to 7 are views for explaining the manufacturing of the retort pouch using laser marking according to an embodiment of the present invention.

Hereinafter, an embodiment in which a method for manufacturing a retort pouch using laser marking according to the present invention is implemented will be described in detail with reference to the drawings.

However, the intrinsic technical idea of the present invention cannot be said to be limited by the embodiments described below, and the It is disclosed that the range that can be easily suggested as a method of substitution or change of the embodiment described in is included.

In addition, since the terms used below are selected for convenience of description, in grasping the intrinsic technical idea of the present invention, they are not limited to the dictionary meaning and are appropriately interpreted as meanings consistent with the technical spirit of the present invention. it should be

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating a process of manufacturing a retort pouch using laser marking according to an embodiment of the present invention, and FIGS. 2 to 7 are a retort pouch manufacturing using laser marking according to an embodiment of the present invention It is a drawing for explaining that.

1 to 7, a polyethylene terephthalate (PET) film layer 111, an aluminum foil layer 112, and a nylon (NY) film layer 113 are sequentially laminated and laminated in FIG. As shown, an outer multilayer film may be prepared (step 110).

Here, in the step 110 of manufacturing the outer multilayer film, it may be laminated (adhesive) by a dry laminating method, and the polyethylene terephthalate film layer 111 is a film having excellent printability, barrier properties and rigidity. As a layer, the surface may be corona-discharged to improve surface energy on the surface of the substrate, and may be provided in a thickness range of 10-20 μm. The reason is that when the thickness is less than 10 μm, there is a problem in that barrier properties and hardness are lowered, and when it exceeds 20 μm, there are problems in flexibility and cost increase.

This polyethylene terephthalate film can be used in a density range of 1.3-1.5 g/cm 2 , a tensile elongation range of 100-120%, and a working temperature range of 70-150 ° C.

In addition, the aluminum foil layer 112 and the nylon film layer 113 are film layers having excellent oxygen barrier properties and moisture barrier properties, and may be provided in a thickness range of 5-15 μm, respectively. The reason is that when the thickness is less than 5 μm, there is a problem in that a pin hole phenomenon occurs, and when it exceeds 15 μm, there is a problem of reduced flexibility and increased cost.

In addition, between the polyethylene terephthalate film layer 111 and the aluminum foil layer 112 (for example, the surface of the polyethylene terephthalate film layer 111 or the surface of the aluminum foil layer 112), the aluminum foil layer 112 ) and between the nylon film layer 113 (for example, the surface of the aluminum foil layer 112 or the surface of the nylon film layer 113), an adhesive for laminating (adhesive) through dry lamination can be applied, respectively. However, the adhesive is a heat-resistant adhesive, and may include at least one selected from a polyester-based urethane adhesive and a polyether-based urethane adhesive.

In particular, among the polyester-based urethane adhesives, a polyester-based urethane two-part adhesive can be used, and 45-48 parts by weight of a polyester polyol, 2-5 parts by weight of a chain extender, 5-8 parts by weight of TDI (toluene diisocyanate) and It can be prepared by mixing 40-48 parts by weight of a solvent to react.

These adhesive layers 114 and 115 may be applied in a thickness range of 3-5 μm, but when the thickness is less than 3 μm, there is a problem in that bubbles or peeling occurs during retort sterilization due to lack of adhesive strength and heat resistance, If it exceeds 5 μm, this is because there is a problem of solvent residual and cost increase.

Here, when the polyethylene terephthalate film layer 111, the aluminum foil layer 112, and the nylon film layer 113 are laminated (adhesive) by a dry laminating method, the curing temperature range of 40-60 ℃, a time of at least 120 hours or more It can be cured depending on the range, because if it is less than 40 ℃ blocking problem occurs, if it exceeds 60 ℃, because there is a problem that the laminated target film shrinks.

On the other hand, the polyethylene terephthalate film layer 111 as described above is a film layer disposed on the outermost side of the retort pouch, and a design (i.e., text, design, etc.) that displays information on food for retort can be printed, For example, a copper plate for gravure printing capable of printing desired information may be manufactured, and gravure printing of an intaglio printing method may be performed using the copper plate.

For example, after nickel (Ni) is plated on an iron (Fe) cylinder, copper (Cu) and chromium (Cr) are plated, and the cylinder is polished and processed in a diamond pendulum motion method to manufacture a copper plate. have.

Then, the heat-resistant ink remaining in the groove (ie, the groove corresponding to the information of the retro food to be printed) formed by cutting the manufactured copper plate with a doctor knife is transferred to the printing paper (ie, polyethylene terephthalate film) Gravure printing is performed, but transfer and drying are repeated by a plurality of guide rolls to be printed, and then wound up to complete printing.

Next, a perforation line 113a may be formed in the nylon (NY) film layer 113 by a laser marking method in the perforation line formation region of the outer multilayer film (step 120).

Here, in the step 120 of forming the perforated line 113a, as shown in FIGS. 3 and 4 , the perforated line 113a may be formed in the form of a continuous line or a dotted line, for example, 9-11 A laser marking machine that generates a carbon dioxide laser having a wavelength range of μm and an output range of 5-10 W can be used. The perforated line 113a can be formed by laser processing by condensing the output with a condensing lens.

Here, when the perforated line 113a is formed in a dotted line shape, the perforated line 113a continuously has a laser marking having a length range of 0.1-2 mm (eg, at least 0.1 mm or more) and a spacing range of 0.1-2 mm. ) may be formed, and each laser marking of the perforated line 113a may be formed in various shapes such as a circle, a square, and a triangle. For example, the laser marking may be formed to have a length range of 0.1-2 mm in diameter in the case of a circular shape.

And, the formation of the perforated line 113a using the laser marking can be performed in a depth range of 5-15 μm, which has a problem of meandering when cutting is less than 5 μm, and when it exceeds 15 μm, a retort pouch is used. A bubble layer is generated in the space where the perforated line 113a is formed during lamination of the non-stretched polypropylene (CPP) film layer 116 to be described later and the problem of lowering the rigidity, oxygen barrier properties, moisture barrier properties, etc. of the film layer constituting the Because there is a problem.

Next, by laminating the non-stretched polypropylene (CPP) film layer 116 to the nylon (NY) film layer 113 of the outer multilayer film, as shown in FIG. 5 , a multilayer film for a pouch can be prepared (step 130).

Here, in the step 130 of manufacturing the multilayer film for a pouch, it may be laminated by a dry laminating method. , heat sealability, stability (tasteless, odorless, non-toxic, etc.), etc., can be provided in a thickness range of 60-110 μm. The reason is that when it is less than 60 μm, there is a problem that the pouch strength is lowered, and when it exceeds 110 μm, there are problems such as an increase in manufacturing cost and a decrease in flexibility, as well as a problem of meandering due to the thickness when cutting using a perforated line. Because.

For example, in the case of a general retort pouch, it is provided with a material of PET/Al/NY/CPR. At this time, the CPR, which is the non-stretched polypropylene film layer 116, is formed to have a thickness of approximately 70 μm, and In case it is provided with a material of PET/Al/NY/CPP, at this time, the CPP, which is the non-stretched polypropylene film layer 116, may be formed to have a thickness of approximately 100 μm.

Such an unstretched polypropylene film can be used in a density range of 0.8-1.0 g/cm 2 , a tensile elongation range of 650-750%, and a working temperature range of 70-130 ° C.

In addition, between the nylon film layer 113 and the non-stretched polypropylene film layer 116 (for example, the surface of the non-stretched polypropylene film layer 116), there is an adhesive for laminating (adhesive) through dry lamination. It may be applied, the adhesive is a heat-resistant adhesive, and may include at least one selected from a polyester-based urethane adhesive and a polyether-based urethane adhesive.

In particular, among the polyester-based urethane adhesives, a polyester-based urethane two-part adhesive can be used, and 45-48 parts by weight of a polyester polyol, 2-5 parts by weight of a chain extender, 5-8 parts by weight of TDI (toluene diisocyanate) and It can be prepared by mixing 40-48 parts by weight of a solvent to react.

The adhesive layer 117 may be applied in a thickness range of 3-5 μm, but if it is less than 3 μm, there is a problem in that bubbles or peeling occurs during retort sterilization due to lack of adhesive strength and heat resistance, and 5 μm This is because there are problems of solvent residual and cost increase when it exceeds .

Here, when the outer multilayer film and the non-stretched polypropylene film layer 116 are laminated (adhesive) by a dry laminating method, it can be cured according to a curing temperature range of 50-100 ° C. and a time range of 10-20 seconds. The reason is that when the temperature is less than 50 °C, a blocking problem occurs, and when it exceeds 100 °C, there is a problem in that the unstretched polypropylene film shrinks.

Next, it can be processed in the form of a retort pouch using a multilayer film for pouch (step 140). Such a retort pouch type may include, for example, a stand pouch, a zipper stand pouch, a stand cap pouch, a T-shaped pouch, an M-shaped pouch, a three-way pouch, a three-way zipper pouch, and an envelope-shaped pouch.

That is, after cutting the multilayer film for a pouch according to a desired size, it can be processed to have a desired pouch shape by heating and pressing the edge portion.

And, after filling the food for retort in the processed retort pouch form, sealing the entrance of the retort pouch form can be manufactured a retort pouch (step 150). For the filling and sealing of food in this step 150, since various disclosures have been made in the prior art, a detailed description thereof will be omitted.

On the other hand, in the retort pouch as described above, a cut-out groove 118 corresponding to the perforation line 113a may be formed. By cutting the edge in a V-shape, at least one cut-out groove 118 may be formed as shown in FIGS. 6 and 7 .

When the retort pouch is cut along the perforated line 113a from the perforated groove 118 through the perforated groove 118, it is possible to prevent meandering in advance and to easily cut it with a small force.

Therefore, according to an embodiment of the present invention, an outer multilayer film is manufactured by sequentially stacking and laminating a polyethylene terephthalate (PET) film layer, an aluminum foil layer, and a nylon (NY) film layer, and a laser marking method is used. After forming a perforation line on the nylon (NY) film layer, by laminating a non-stretched polypropylene (CPP) film layer to prepare a multilayer film for pouch, the perforation line is formed on the nylon film layer to improve the ease of tearing of the retort pouch. have.

Claims (5)

Polyethylene terephthalate (PET) having a density range of 1.3-1.5 g/cm2, a tensile elongation range of 100-120%, and a temperature range of 70-150 ° C. ) A film layer, an aluminum foil layer having a thickness of 5-15 μm, and a nylon (NY) film layer having a thickness of 5-15 μm are sequentially laminated, the polyethylene terephthalate (PET) film layer and the Between the aluminum foil layer and between the aluminum foil layer and the nylon (NY) film layer, 45-48 parts by weight of polyester polyol, 2-5 parts by weight of a chain extender, TDI (toluene di) Isocyanate) 5-8 parts by weight and 40-48 parts by weight of a solvent are mixed and reacted with at least one selected from a polyester-based urethane adhesive and a polyether-based urethane adhesive to have a thickness of 3-5 μm. After applying the layer, the polyethylene terephthalate (PET) film layer, the aluminum foil layer and the nylon (NY) film layer are laminated in a dry laminating method for at least 120 hours in a curing temperature range of 40-60 ° C. manufacturing an outer multilayer film;
A laser marking machine that generates a carbon dioxide laser having a wavelength range of 9-11 μm and an output range of 5-10 W is used, but the carbon dioxide laser is condensed with a condensing lens to form the perforated line of the outer multilayer film. Nylon (NY) Forming a perforation line having a length of 0.1-2mm, an interval of 0.1-2mm and a depth of 5-15㎛ on the film layer;
Polyester reacted by mixing 45-48 parts by weight of a polyester polyol, 2-5 parts by weight of a chain extender, 5-8 parts by weight of TDI (toluene diisocyanate) and 40-48 parts by weight of a solvent to the nylon (NY) film layer After applying an adhesive layer to have a thickness of 3-5 μm with at least one selected from a Polyester urethane adhesive and a Polyether urethane adhesive, dry at a curing temperature of 50-100° C. for 10-20 seconds. A non-stretched polypropylene (CPP) film layer having a thickness of 60-110㎛ while having a density range of 0.8-1.0 g/cm2, a tensile elongation range of 650-750%, and an operating temperature range of 70-130 ℃ by laminating method Laminating to prepare a multi-layer film for pouch;
processing the retort pouch form using the multilayer film for pouch; and
After filling the retort food inside the processed retort pouch form, sealing the entrance of the retort pouch form to manufacture a retort pouch; Method of manufacturing a retort pouch using laser marking comprising a. delete delete delete delete

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