KR101103901B1 - Vacuum bottle cap and manufacturing method thereof - Google Patents

Abstract

The present invention is the base of the shape corresponding to the shape of the container inlet; A side wall portion connected to the base portion and rotating along a spiral formed on an outer circumferential surface of the container inlet to be fixed to the container inlet; And a vacuum stopper connected to the sidewall portion, the end cap being curled inwardly, and laminated to the inner surface, outer surface, or both of the base portion, the sidewall portion, and the distal portion, thereby generating scratches of the surface (s). A polymer resin film layer to be prevented, and relates to a vacuum bottle cap including a film layer made of a polymer resin selected from polyethylene terephthalate, polyolefin and polyvinyl chloride.

Since the vacuum bottle cap according to the present invention can be prevented from rusting by the polymer resin film layer laminated on the inner surface and / or the outer surface, it can be used to seal the container inlet containing the retort food and the high acid food. .

Bottle cap

Description

Vacuum bottle cap and manufacturing method thereof {SEALING BOTTLE CAP AND METHOD FOR PREPARING THE SAME}

The present invention relates to a vacuum bottle cap and a method of manufacturing the same to prevent the occurrence of rust on the inner and / or outer surface.

In recent years, consumers prefer traditional foods and high-performance foods useful for human body. Therefore, many new products are required to meet various consumer's tastes. Furthermore, packaging containers for new products also need various forms and types. to be. However, due to the well-being hot air, consumers' attention about food and beverages and their packaging containers is increasing, and various environmental regulations such as environmental hormone regulation of food and beverage and packaging containers thereof are being strengthened internationally.

Currently, in advanced countries such as Europe and the United States, glass bottles are already used as containers for various foods to ensure the safety of the human body for packaging containers. In recent years, glass bottles are used in place of can containers, which are commonly used in Korea. .

In general, the contents packaged in a glass bottle are packaged through a process such as autoclaving after sealing to extend the shelf life. At this time, a bottle cap (cap) formed of various materials, such as plastic, aluminum (ROPP cap), steel (vacuum cap, crown cap), is used to seal the glass bottle inlet. Vacuum bottle caps with excellent bottle cap conditions such as ease of opening, safety, and resealability are used.

However, in the case of a vacuum bottle cap, after being printed and painted on a steel plate is formed into a bottle cap shape, when the end portion is curled in the molding process, the coating may be peeled off to expose the metal part, or during molding The wear and excessive force of the mold may cause cracks in the coating on the inner surface, exposing the metal parts. In addition, when the container containing the contents is sealed with a vacuum bottle cap, the inlet portion of the container directly contacting the vacuum bottle cap is rough or curved, so that the coating of the end portion of the vacuum bottle cap may be peeled off and the metal may be exposed. As such, when there is an exposed portion of the metal part in the vacuum bottle cap, the exposed metal part is corroded in contact with the contents or moisture contained in the glass bottle during the autoclaving process and / or the handling of the glass bottle after sealing the contents. As a result, the contents are contaminated and are not sanitary safe.

In addition, even if the inner coating and coating are not peeled off during the manufacturing process of the vacuum bottle cap, the products using the vacuum bottle cap are usually not used for single use, and are stored in a peeled off state because the user repeatedly opens and closes the vacuum bottle cap. This causes rust, which is not hygienic. In addition, high temperature sterilization after the contents are sealed in the container may cause hot steam to penetrate into the cracked portion of the inner coating film of the vacuum bottle cap, where the hot steam infiltrate reacts with the metal surface of the cracked portion. Rust can form during the process, which can be hygienic and poor.

According to the present invention, the coating is peeled off during the molding and / or use of the vacuum bottle cap by laminating a film made of a polymer resin such as polyethylene terephthalate (PET) on the surface of the substrate during the manufacture of the vacuum bottle cap. Even if the polymer resin film can prevent the occurrence of scratches on the surface of the substrate, it is intended to prevent the occurrence of rust by preventing the surface of the substrate is exposed.

The present invention is the base of the shape corresponding to the shape of the container inlet; A side wall portion connected to the base portion and rotating along a spiral formed on an outer circumferential surface of the container inlet to be fixed to the container inlet; And a vacuum stopper connected to the sidewall portion, the end cap being curled inwardly, and laminated to the inner surface, outer surface, or both of the base portion, the sidewall portion, and the distal portion, thereby generating scratches of the surface (s). As the polymer resin film layer to be prevented, a vacuum bottle cap including a film layer of a polymer resin selected from polyethylene terephthalate, polyolefin and polyvinyl chloride is provided.

In addition, the present invention comprises the steps of laminating a film of a polymer resin selected from polyethylene terephthalate, polyolefin and polyvinyl chloride on the inner surface and / or outer surface of the substrate (substrate) to form a polymer resin film layer; And cutting the substrate on which the polymer resin film is laminated, and then forming the cap in a bottle cap.

Since the vacuum bottle cap according to the present invention can be prevented from rusting by the polymer resin film layer laminated on the inner surface and / or the outer surface, it can be used to seal the container inlet containing the retort food and the high acid food. .

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The vacuum bottle cap according to the present invention is made of a polymer resin selected from polyethylene terephthalate, polyolefin and polyvinyl chloride on the surface of the base 11, the side wall 12 and the distal end 13, as shown in FIGS. By laminating the film layer 20, even when the coating film of the bottle cap surface is peeled off during the manufacture and / or use of the vacuum bottle cap, scratches can be prevented due to the polymer resin film layer 20 having excellent scratch resistance, so that the substrate surface can be prevented. Not exposed, and therefore rust generation due to contact of the exposed substrate surface with the contents and / or moisture is prevented.

Vacuum bottle cap according to an embodiment of the present invention is the base portion 11 of the shape corresponding to the shape of the container inlet; A side wall portion 12 connected to the base portion and rotating along a spiral formed on an outer circumferential surface of the container inlet to be fixed to the container inlet; And a distal end 13 connected to the side wall and curled inward.

The material of the base, the side wall and the end is not particularly limited, but in order to tightly seal the contents contained in the container after autoclaving (retort sterilization), it is appropriate that the metal plate has a strength sufficient to withstand the pressure in the container. Non-limiting examples of the metal plate is a steel sheet or a tin plated steel sheet, a nickel plated steel sheet, a tin / nickel double-coated steel sheet, a surface treated steel sheet such as chromated steel sheet.

In addition, the thickness of the base portion, the side wall portion and the end portion is appropriate to adjust the numerical value so that the vacuum bottle cap of the present invention withstands the pressure in the container, the thickness of the base portion, the side wall portion and the end portion is about It may range from 0.145 to 0.165 mm.

On the inner and / or outer surfaces of the base 11, the side wall 12, and the distal end 13, a polymer resin film layer 20 is laminated to prevent scratching of the surface (s). The polymer resin film is formed of polyolefin such as polyethylene, PE, polypropylene, PP, polyethylene terephthalate (PET), polyvinyl chloride (PVC). The polymer resin is excellent in heat resistance and scratch resistance, and also produces low molecular weight substances, and does not change taste or smell of contents due to migration of low molecular weight substances. According to an example of the present invention, the polymer resin film layer may be a film made of polyethylene terephthalate which is generally excellent in transparency, heat resistance, and scratch resistance.

The polymer resin preferably has a weight average molecular weight in the range of about 35,000 to 45,000.

In addition, the degree of crystallinity of the polymer resin is preferably about 35 to 50%.

The thickness of the polymer resin film layer varies depending on the type of the film layer, but the range of about 10 to 20 ㎛ can further improve the scratch resistance of the film layer, and there is a problem in the bottle cap moldability in terms of quality control It can be suppressed and appropriate in terms of cost reduction. According to an example of the present invention, the polymer resin film layer has a thickness of about 19 μm.

However, even if the polymer resin film layer has excellent heat resistance, the polymer resin film layer may be melted or deformed in a printing process performed at a temperature of about 180 ° C. in the manufacture of a vacuum bottle cap, and the polymer resin film, in particular Due to sticking (sticking) of the PET film itself, printing failure may occur or feeding performance may be insufficient in the bottle cap pressing process. In order to compensate for this problem, the present invention provides a coating layer (hereinafter, referred to as a 'first coating layer') 30 that prevents sticking while protecting the film layer on the surface of the polymer resin film layer 20. Can be formed (see FIG. 2).

The material (paint) of the first coating layer has an elongation similar to that of the film layer to prevent the occurrence of cracks in the stretching of the polymer resin film layer, and to prevent melting / straining and sticking of the film layer. There is no particular limitation as long as it has high heat resistance and excellent slip resistance. Non-limiting examples of such paints include epoxy type paints, vinyl type paints, and the like.

In addition, the thickness range of the first coating layer is not particularly limited, and as is known in the art, the content of the first coating layer-forming paint is in a range of about 25 to 120 mg based on a specimen having a size of 10 cm × 10 cm. The thickness of the first coating layer can be adjusted by adjusting to. However, if the thickness of the first coating layer is too thin, the formed first coating layer may not properly serve to protect the polymer resin film layer or prevent sticking, whereas the thickness of the first coating layer may be If it is too thick, the elongation of the polymer resin film layer may not be compensated for, thereby decreasing workability. Therefore, in the present invention, to adjust the content of the first coating layer-forming paint to a range of about 40 to 60 mg based on a specimen having a size of 10 cm × 10 cm so that the formed first coating layer can exhibit more significant effects. desirable.

On the other hand, according to another example of the present invention shown in Figure 3, the bottle cap while preventing the crack (crack) generated in the polymer resin film stretched by the molding pressure in the process of forming a bottle shape during the manufacturing of the vacuum bottle cap In order to easily adhere the liner to the sealing portion of the coating layer, a coating layer that complements the adhesive force with the liner while preventing cracks on the polymer resin film layer on the surface of the first coating layer 30 (hereinafter referred to as 'second coating layer' 40) can be formed.

The second coating layer may include a vinyl type paint and a polyvinyl chloride additive (PVC additive). At this time, the PVC powder is in the form of a powder, the content thereof is appropriate to include about 10 to 20 parts by weight based on 100 parts by weight of the vinyl type paint.

In addition, in the present invention, the thickness of the second coating layer is adjusted in order to further improve adhesion to the bottle cap liner while preventing cracks in the polymer resin film. Specifically, when the second coating layer is formed on a polymer resin film (ex. PET film) obtained by uniaxial stretching, the elongation of the machine direction (MD) of the second coating layer and the direction perpendicular to the machine The content of the second coating layer forming material is adjusted so that the elongation of (Transverse Direction, TD) is within the MD elongation and TD elongation range of the polymer resin film. The content of the second coating layer forming material (including paint and additives) is preferably adjusted in the range of about 40 to 60 mg based on the specimen having a size of 10 cm × 10 cm.

Meanwhile, according to another example of the present invention, a print layer 50 having a desired color and design may be formed on the outermost outer surface of the base portion through a printing method known in the art such as a metal printing method. In addition, as shown in FIG. 4, in order to protect the printed layer, the printed layer 50 and the outermost outer surface of the base portion on which the printed layer is not formed are referred to as a coating layer (hereinafter referred to as a 'third coating layer'). ) 60 may be formed.

The print layer 50 may be formed by applying a material known in the art. Non-limiting examples of the material include a vinyl type paint, an epoxy type paint, a mixture thereof, and the like.

In addition, the thickness of the third coating layer formed of such a coating is not particularly limited, but by adjusting the content of the third coating layer-forming coating to a range of about 40 to 120 mg based on a specimen having a size of 10 cm × 10 cm, The thickness of the third coating layer can be adjusted.

Meanwhile, as shown in FIGS. 5 and 6, the vacuum bottle cap of the present invention is a polymer resin by laminating a film of a polymer resin selected from polyethylene terephthalate, polyolefin and polyvinyl chloride on an inner surface and / or an outer surface of a substrate. Forming a film layer (S510, S610); And the polymer resin film may be manufactured by a method including a step (S560, S660) to form a bottle cap after cutting the laminated substrate (S550, S650), but is not limited thereto.

1) The substrate usable in the present invention is suitably a metal plate having a strength sufficient to withstand the pressure in the container in order to tightly seal the contents contained in the container after autoclaving (retort sterilization). Non-limiting examples of the metal plate is a steel sheet or a tin plated steel sheet, a nickel plated steel sheet, a tin / nickel double-coated steel sheet, a surface treated steel sheet such as chromated steel sheet.

The polymer resin film is laminated by the hot melt bonding method on the inner surface and / or the outer surface of such a substrate. Specifically, the polymer resin film is melted using a roller preheated to the polymer resin film at a temperature of 200 to 250 ° C. so that the polymer resin film does not peel off from the surface of the substrate during the heat sterilization treatment (Retort treatment) of the vacuum bottle cap. Or after thermal deformation, the molten or thermally modified polymer resin film is laminated on the surface of the substrate.

On the other hand, the present invention after the polymer resin film is laminated on the base material, by applying a vinyl type paint or an epoxy type paint on the surface of the polymer resin film to prevent the occurrence of sticking (sticky) of the polymer resin film The method may further include forming the first coating layer to complement the elongation of the film (S520 and S620).

The first coating layer forming method includes spraying coating, dipping coating, roll coating, brushing coating, and the like, but is not limited thereto.

In this case, the coating amount of the coating may range from about 25 to 120 mg based on a specimen having a size of 10 cm × 10 cm, preferably about 40 to 60 mg.

In addition, the present invention is applied to the surface of the first coating layer, the vinyl type paint and PVC powder additives by applying the above-described coating method to prevent the occurrence of cracks of the polymer resin film while complementing the adhesive force with the bottle cap liner The method may further include forming a coating layer (S540 and S630). At this time, the content of the material (including paint and additives) forming the second coating layer is suitably about 40 to 60 mg based on a specimen having a size of 10 cm × 10 cm.

In addition, the present invention is a third coating film that protects the printed layer on the outermost outer surface of the substrate on which the printing layer and the printing layer is not formed after applying a printing paint on the outermost outer surface of the substrate to form a printing layer Forming a layer may further include the steps (S530, S640). Here, when the polymer resin film layer is formed on both sides (inner and outer surfaces) of the substrate, the second coating layer forming step (S630) and the print layer and the third coating layer forming step (S640) are sequentially or in reverse order. It can be done with

The printing layer may be formed by a metal printing method of a roll type, but is not limited thereto.

The method of forming the third coating layer may include spraying coating, dipping coating, roll coating, brushing coating, and the like as the method of forming the first coating layer. In this case, the coating amount of the paint forming the third coating layer is appropriately about 40 to 120 mg based on a 10 cm × 10 cm specimen to protect the printed layer formed.

2) thereafter, the polymer resin film is cut the laminated substrate and then molded into a vacuum bottle cap form (S560, S660).

Cutting of the substrate can be carried out using a cutting blade known in the art. At this time, the shape of the substrate to be cut is adjusted according to the shape of the container inlet, it is appropriate that the shape corresponding to the shape of the container inlet. In addition, the size of the substrate to be cut also adjusts the cutting size according to the size of the container inlet.

The substrate on which the cut polymer resin film is laminated may be molded by using a vacuum cap forming apparatus known in the art.

Although the present invention has been described with reference to the drawings, it is merely exemplary, and various changes and modifications can be made within the scope of the appended claims. In addition, all details may be replaced by other technically equivalent elements.

1 is a cross-sectional view of a vacuum bottle cap according to an example of the present invention.

2 to 4 are cross-sectional views of the vacuum bottle cap according to another example of the present invention.

5 and 6 are flowcharts schematically showing a process of manufacturing a vacuum bottle cap of the present invention.

≪ Brief Description of Drawings &

11: base, 12: side,

13: terminal portion, 20: polymer resin film layer,

30: first coating layer, 40: second coating layer,

50: printing layer, 60: third coating layer

Claims (6)

A base having a shape corresponding to the shape of the container inlet; A side wall portion connected to the base portion and rotating along a spiral formed on an outer circumferential surface of the container inlet to be fixed to the container inlet; And a vacuum bottle cap connected to the side wall portion and including an end portion curled inwardly. A polymer resin film layer laminated on the base, side walls, and end portions of the inner surface, outer surface, or both, to prevent scratching of the surface (s), wherein the polymer resin film is selected from polyethylene terephthalate, polyolefin, and polyvinyl chloride. Vacuum bottle cap comprising a film layer. The method according to claim 1, wherein a first coating layer is further formed on the surface of the polymer resin film layer to prevent sticking of the film layer while protecting the film layer. The material of the first coating layer is a vacuum bottle cap, characterized in that the vinyl type paint or epoxy type paint. The second coating layer is further formed on the surface of the first coating layer to prevent adhesion of the polymer resin film layer and to improve adhesion to the bottle cap liner. The material of the second coating layer is a vacuum bottle cap, characterized in that containing a vinyl type paint and PVC powder. Laminating a film made of a polymer resin selected from polyethylene terephthalate, polyolefin, and polyvinyl chloride on an inner surface, an outer surface, or both of the substrate to form a polymer resin film layer; And cutting the substrate on which the polymer resin film is laminated, and then molding the substrate to form a bottle cap, wherein the vacuum bottle cap according to claim 1 is prepared. According to claim 4, Before the step of cutting the laminated substrate the polymer resin film, And coating a vinyl type paint or an epoxy type paint on the surface of the polymer resin film layer to form a first coating layer that protects the polymer resin film layer and prevents sticking of the film. Method of manufacturing a vacuum cap. The method according to claim 5, wherein a second coating layer is formed on the surface of the formed first coating layer by applying a vinyl type paint and a PVC powder additive to prevent cracking of the polymer resin film layer while compensating for adhesion to the bottle cap liner. Vacuum bottle cap manufacturing method characterized in that it further comprises the step of.

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