KR20070120386A - Method of manufacturing packing vessel and packing vessel produced by the methods - Google Patents

Abstract

A method of manufacturing a packing vessel and a packing vessel produced by the method are provided to increase intensity of the packing vessel with a high density by using a plurality of insert injection molded performs, thereby increasing intensity of the packing vessel without having burrs on the surface. A method of manufacturing a packing vessel comprises the steps of: injection molding a first form with a first mold; insert injection molding a second form by inserting the first form into a second mold; heating the second form with the first form insert injection molded to turn the second form into a high-temperature multilayered preform(40) with fluidity, so as to blow form the second form; inserting the high-temperature multilayered preform into a blow mold(50) and blowing compressed air via an air inlet port(60) to blow up the high-temperature multilayered preform and allow it to make contact with an inner shape of the blow mold; cooling the blow mold and solidifying the form when a shaping of form is completed; and taking out the form from the blow mold when the blow mold is cooled and the form is solidified.

Description

Method for manufacturing multi-layer packaging container and packaging container produced by the same

1a to 1e is an exemplary view showing a conventional blow molding process.

Figure 2a is an exemplary view showing a process of molding a multi-layer blow packaging container using a conventional multi-layer blow molding machine.

Figure 2b is a cross-sectional view of a multi-layer blow packaging container molded using a conventional multi-layer blow molding machine.

Figure 3a is an exemplary view showing a primary molding step according to the manufacturing method of the present invention.

Figure 3b is an exemplary view showing a secondary molding step according to the manufacturing method of the present invention.

Figure 3c is an illustration showing a tertiary molding step according to the manufacturing method of the present invention.

Figure 3d is an exemplary view showing a heating step according to the manufacturing method of the present invention.

Figure 3e is an exemplary view showing a blow molding step by the manufacturing method of the present invention.

Figure 3f is an illustration showing a mold cooling and molded product solidification step by the manufacturing method of the present invention.

Figure 3g is an illustration showing a take-out step by the manufacturing method of the present invention.

<Description of the symbols for the main parts of the drawings>

10: primary molding mold 12: primary molding

14 core 20 secondary molding mold

22: secondary molding 30: third molding mold

32: 3rd molding 40: multilayer preform

50: blow mold 60: air inlet

70: molded article

The present invention relates to a method for manufacturing a packaging container formed in multiple layers and to a packaging container manufactured by the manufacturing method. In particular, each layer of the packaging container formed in multiple layers is formed in a continuous surface without any intermittent surface, so that gas permeability such as oxygen is improved. It completely excludes and insert injection molding of preforms of multi-layer blow packaging containers into multi-layers to form densities of packaging containers, increase the strength of packaging containers and smooth the surface to block light and gas. The present invention relates to a method for manufacturing a multi-layer packaging container and to a packaging container produced thereby to improve the properties and to enhance the quality of the product.

In general, cosmetics or drugs that easily react with gas such as oxygen or are easily deteriorated by light transmission are packaged and sold in multi-layered packaging to prevent gas permeation and light transmission. Such a conventional multi-layer packaging container generally forms a blocking layer between the inner and outer layers, the inner and outer layers block moisture, and the central layer serves to prevent the permeation of gas particles or light particles.

The inner and outer layers of the conventional multi-layer packaging container generally uses a polyethylene (PE) resin, which is a base resin, and the blocking layer of the center layer is EVOH (Ethylene Vinyl alcohol Copolymer) or nylon or polypropylene (PP). ), Surlyn, PVC (polyvinyl chloride), PET (polyethylene terephthalate) and the like.

In order to manufacture such a multilayer packaging container, a multilayer blow molding method is used. First, a general blow molding method and a multilayer blow molding method will be described with reference to the drawings.

The blow molding method has five steps as shown in FIGS. 1A to 1E. The first step is a plasticization step, in which a molding material is introduced into a hopper of a blow molding machine, and the molding material is heated and melted. Next, the hollow tube is extruded using an extrusion mold in the extrusion step of FIG. 1A. The hollow tube formed by extrusion is called parison. Next, when the parison is placed in the blow mold and the blow mold is closed in the forming step of FIG. 1B, the parison lower part is cut while being joined by the blow mold. After that, compressed air is injected through the air inlet to inflate the parison to be shaped like the inside of the blow mold. Next, when the parison expands to the cooling and solidifying step of FIG. 1C and the shape of the molded part is completed, the compressed air is continuously replenished through the air inlet to maintain a constant pressure inside the molded part to prevent shrinkage of the molded part. The blow mold is cooled to solidify the molded article. Next, when the blow mold is cooled and the molded article is solidified in the take-out step of FIG. 1D, the blow mold is opened to take out the molded article. In the next step, the molded article scrap cutting step of FIG. 1E is completed by cutting off and separating the scraps of the molded part and the bottom part of the molded article.

Next, a conventional multilayer blow molding method will be described. The multi-layer blow molding method is described in detail in Korean Utility Model Registration No. 338727, which will be described below with reference to FIG. 2.

As shown in FIG. 2A, the multi-layer blow molding is performed by a multi-layer blow molding machine. The first extruder 110, the second extruder 120, and the third extruder 130 are each melted with a resin having different viscosities. Next, it is injected through the nozzle. In particular, the resin injected from the second extruder 120 uses a resin that can block gas and light transmission.

The resin injected from the first extruder 110 forms the parison 112 for the outer wall, and the resin injected from the second extruder 120 forms the parison 122 for the intermediate wall and the third extruder 130. The injected resin forms the parison 132 for the inner wall of the container. At this time, the inner wall parison 132, the outer wall parison 112 and the middle wall parison 122 are pipe shapes having different diameters and open at both ends, and the inner wall parison 132 in the order of the smaller diameters. The middle wall parison 122 and the outer wall parison 112 are sequentially inserted to form one integral pipe shape.

In this way, the parison, in which the inner wall parison 132, the middle wall parison 122, and the outer wall parison 112 form one integral pipe shape, is placed in the blow mold 140 and the blow mold 140 is placed. When closed, the parison lower portion is pressed by the blow mold 140 and cut as shown in FIG. 2A. After inserting the air inlet into the center of the parison and injecting the compressed air, the three-ply parison expands and adheres to the inner wall and bottom of the blow mold 140 to complete the packaging container as shown in FIG. 2B. Done.

The packaging container is formed from the inner wall parison 132, the middle wall parison 122, and the outer wall parison 112, and the inner container 134, the intermediate layer 124 and the outer layer 114 are formed. Is pressed by the blow mold 140 to form a joining surface 150 in which the inner layer 134, the middle layer 124, and the outer layer 114 are pressed into one surface, and a burr below the bottom ( 152 is formed.

However, such a conventional multi-layer blow packaging container is pressed by pressing the lower part of the multi-layer parison while closing the blow mold 140 to form a joining surface 150, the inner layer 134 and the intermediate layer 124, the outer layer 114 Each layer of is not intersected and does not form a complete gas permeability. In addition, the jagged portion 152 is generated in the lower portion of the packaging container, which hinders the luxury of the packaging container. Since the parison is molded by extrusion, the density is lower than that of general injection molding, so that the gas permeability and light penetration prevention ability are relatively low. Its surface was so rough that it hindered the luxurious product composition.

The present invention for solving the problems as described above, by forming each layer of the multi-layer packaging container in a continuous surface without intermittent surface to completely exclude gas permeability such as oxygen, and also of the multi-layer blow (pack) By inserting preforms in multiple layers, densities of the packaging can be densely formed to increase the strength of the packaging and smooth the surface, as well as to enhance the product by increasing light and gas barrier properties. The purpose.

The present invention for achieving the above object, the primary molding step of injection molding the primary molding with a synthetic resin, and the secondary molding step of insert injection molding the secondary molding by inserting the primary molding to the secondary molding mold And, a third molding step of insert-molding the third molding by inserting the second molding into the third molding mold as needed, and applying heat to the third molding so as to blow mold the third molding. A heating step of forming a high temperature multilayer preform having a blow, and the high temperature multilayer preform is blown by inserting the high temperature multilayer preform into a blow mold and blowing compressed air through an air inlet to blow molding the high temperature multilayer preform as a shape inside a blow mold. When the molding step and the shape of the molded part are completed, the compressed air is replenished to keep the internal pressure of the molded part constant so that the molded part does not shrink. And cooling the blow mold to solidify the molded article and the solidification step of the molded article, and a manufacturing method of the multilayer packaging container including a blowout step of taking out the molded article from the blow mold when the blow mold is cooled to solidify the molded article. Can be achieved with packaged packaging.

Hereinafter, the configuration of the present invention in detail by the accompanying drawings as follows.

Figure 1a to 1e is an exemplary view showing a conventional blow molding process, Figure 2a is an exemplary view showing a process of forming a multi-layer blow packaging container using a conventional multi-layer blow molding machine, Figure 2b is a conventional multi-layer blow molding machine Figure 3 is an exemplary cross-sectional view of a multi-layer blow packaging container molded using, Figure 3a is an illustration showing a primary molding step according to the manufacturing method of the present invention, Figure 3b is a secondary molding step according to the manufacturing method of the present invention 3c is an exemplary view showing a tertiary molding step according to the manufacturing method of the present invention, Figure 3d is an exemplary view showing a heating step by the manufacturing method of the present invention, Figure 3e is a manufacturing of the present invention Figure 3 is an exemplary view showing a blow molding step according to the method, Figure 3f is an exemplary view showing a mold cooling step and the solidification of the molded article according to the manufacturing method of the present invention, Figure 3g Exemplary drawing showing the extraction step.

As shown in Figures 3a to 3g, the manufacturing method of the multi-layer packaging container of the present invention is a primary molding step, secondary molding step, tertiary molding step, heating step, blow molding step, mold cooling and molded product solidification step, take out Consists of steps.

The primary molding step, as shown in Figure 3a is a step of injection molding the primary molded article 12 made of synthetic resin using the primary molding mold (10). In the center of the primary molding 12 to achieve a hollow state by using the core (14). Synthetic resin as the injection material may be polyethylene (PE) or nylon, EVOH (Ethylene Vinyl alcohol Copolymer), polypropylene (PP), Surlyn, PVC (polyvinyl chloride), PET (polyethylene Terephthalate), polyamide (polyamide), polystyrene (polystyrene), polycarbonate (polycarbonate), polyester and the like, including, but not limited to, includes all the heat-melting materials used in general injection molding.

The secondary molding step, as shown in Figure 3b is a step of insert injection molding the secondary molding 22 by inserting the primary molding 12 to the secondary molding mold (20). Insert injection in the present invention is the same as the conventional insert injection, a detailed description thereof will be omitted. The material of the secondary molded part 22 may also use all the conventional injection molding materials, such as those used in the primary molded part 12, except that the secondary molded part 22 may be formed of a material different from that of the primary molded part 12. Using injection molding.

The third molding step may or may not be included as necessary. That is, when the two-layer packaging container is to be configured in the multilayer packaging container, only the first molding step and the second molding step need to be performed, and when the three-layer packaging container is intended, the first molding step and the second packing container are required. In addition to the third molding step, the third molding step may be performed. In addition, although not shown in the drawings of the present invention, if four or more layers of packaging container are to be constructed, the first molding step, the second molding step, and the third molding step may be further subjected to four or more molding steps.

In the tertiary molding step, as shown in FIG. 3c, the secondary molding 22, into which the primary molding 12 is inserted, is inserted into the tertiary molding mold 30, thereby inserting the tertiary molding 32 into the insert. Molding step. The injection molding material used herein may also use all of the conventional injection molding materials used in the first and second molding steps. However, the tertiary molding 32 is injection molded using a material different from that of the secondary molding 22. That is, the first, second, and tertiary moldings 12, 22, and 32 are formed in multiple layers by using different injection molding materials between adjacent moldings.

In the heating step, as shown in FIG. 3D, the high-temperature multi-layer having fluidity is applied by applying heat to blow the first molded article 12 and the second molded article 22 to the injection molded tertiary molded product 32. A step of forming the preform 40 is performed.

In the blow molding step, as shown in FIG. 3e, the hot multilayer preform 40 is inserted into the blow mold 50 and blown compressed air through an air inlet 60 to inflate the hot multilayer preform 40. The molding is performed to be in close contact with the inside of the blow mold 50.

In the mold cooling and solidification of the molded article, as shown in FIG. 3F, when the shape of the molded article 70 is blow molded, the blow mold 50 is cooled to solidify the molded article 70, but the molded article 70 is blown ( 50) The pressure inside the molded product 70 is kept constant while replenishing the compressed air through the air inlet 60 so as not to shrink due to cooling.

As shown in FIG. 3G, when the blow mold 50 is cooled to solidify the molded product 70, the molded product 70 is taken out from the blow mold 50.

As described above, the present invention is to form a multi-layered packaging container formed through the first molding step, the second molding step, the third molding step, the heating step, blow molding step, mold cooling and molded product solidification step, take-out step of the multilayer It is a method of manufacturing a multi-layer packaging container which completely removes gas permeability such as oxygen by forming all the continuous surfaces without intermittent surfaces on each layer, and the packaging container produced by this is excellent in gas barrier property and light blocking property and safely stores contents. , Can be used.

In more detail, when manufacturing a conventional multi-layer packaging container, a pipe-shaped parison having both ends opened into a blow mold 140 and blow molded, wherein the parison is put into a blow mold 140 and a blow mold 140 When it is closed as shown in FIG. 2, the parison lower portion is pressed by the blow mold 140 to be cut while bonding. Therefore, the bottom surface is formed with a bonding surface 150 in which the inner layer 134, the intermediate layer 124, and the outer layer 114 are gathered into one surface, and thus, each layer is not formed as a continuous surface. It became intermittent and caused gas such as oxygen to permeate through it, causing the contents to deteriorate, such as oxidizing. The present invention completely eliminates gas permeation such as oxygen by removing the intermittent surface and forming the continuous surface.

In addition, in the prior art, a jagged portion (burr) 152 is formed on the bottom of the packaging container, which causes a high quality of the product, but the present invention has a sleek appearance without a jagged portion because there is no joint surface 150. .

The packaging container manufactured by the method for manufacturing a multilayer packaging container of the present invention completely excludes oxygen permeability and light permeability, and is a packaging container with a smooth appearance, and prevents deterioration of contents due to oxygen or light transmission. Courage

As described above, in the present invention, due to the conventional bonding surface 150, each layer is not formed as a continuous surface and is intermittent at the bonding surface 150 so that gas such as oxygen is permeated through the contents to oxidize the contents. The conventional problem that causes the deterioration of the back, etc. is eliminated. The multilayer preform 40 is formed by insert injection and then blow-molded to remove the intermittent surface from the entire packaging container, thereby forming a continuous surface such as oxygen. Completely excluded gas permeation,

In addition, in the prior art, a jagged portion (burr) 152 is formed at the bottom of the packaging container, which leads to a high quality of the product, but the present invention has a smooth appearance without the jagged portion by removing the bonding surface 150 I can contribute to the quality of the product,

In the conventional blow molding, the parison is formed by extrusion and then blow-molded using the same, so that the parison by extrusion is not dense, and thus the blow molded packaging is also not dense, thus reducing the strength of the packaging. Although the gas permeation prevention and light transmission prevention effect was less, the present invention is to form a multi-layer preform 40 by injection, but by insert injection molding for each layer to obtain a very dense multi-layer preform 40 can be used Blow molded article (70) also has a very dense density, which increases the strength of the packaging container, has a high gas permeation prevention or light permeation effect, and the surface of the packaging container is smooth due to the dense density, thereby obtaining a refined and luxurious appearance. It has merit.

Claims (5)

In the manufacturing method of the multi-layer packaging container for packaging cosmetics or drugs and the packaging container produced thereby; A primary molding step of injection molding the primary molding 12 using the primary molding mold 10: A secondary molding step of insert-molding the secondary molding 22 by inserting the primary molding 12 into the secondary molding mold 20; A heating step in which the primary molded part 12 is heated to form a high temperature multilayer preform 40 having fluidity by applying heat to blow-molded the insert-molded secondary molded part 22; The high temperature multilayer preform 40 is inserted into the blow mold 50 and blown with compressed air through an air inlet 60 to inflate the high temperature multilayer preform 40 so as to be in close contact with the inside of the blow mold 50. Blow molding step: Cooling the blow mold 50 when the shape of the molded product 70 is completed, the mold cooling and solidified product solidification step of solidifying the molded product 70 and: When the blow mold (50) is cooled and the molded article (70) is solidified, the manufacturing method of the multi-layer packaging container characterized in that it comprises a take-out step of taking out the molded article (70) from the blow mold (50). The method according to claim 1, wherein a third molding step is further added between the second molding step and the heating step, wherein the third molding step is performed by inserting the secondary molded part 22 into which the primary molded part 12 is injected. Method of manufacturing a multi-layer packaging container, characterized in that the step of insert injection molding the third molding (32) by inserting into the primary molding mold (30). The method of claim 2, wherein at least one molding step is further added between the tertiary molding step and the heating step, wherein the additional molding step is performed by insert injection molding the tertiary molded product 32 obtained in the tertiary molding step. Method for producing a multi-layer packaging container characterized in that. The molding according to any one of claims 1 to 3, wherein the primary molding 12, the secondary molding 22, the tertiary molding 32 and the molding in the molding step added after the tertiary molding step. The manufacturing method of the multi-layer packaging container, characterized in that the moldings adjacent to each other are different materials. The packaging container according to any one of claims 1 to 4, wherein the packaging container is manufactured by the method for manufacturing the multilayer packaging container.

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