KR101341643B1 - Method for injection blow molding of bottle having unevenness pattern its inner surface and bottle therof - Google Patents

Abstract

The present invention provides a manufacturing method for a bottle which forms a bottle in a state in which an unevenness pattern of a preform in an expanded state by forming the inner surface of a preform with the patterns of a groove or a projection by the pattern printed on the external surface of the core of a core mold by an injection molding and forming the preform into a bottle by blow molding in order to form the unevenness pattern on the inner surface of the bottle which is final object by applying an injection blow molding method which is one step blow molding, and the bottle. The present invention for manufacturing a bottle in order to form a pattern on the inner surface of the bottle maximize pattern diversity and the reduction of production costs, simplifies manufacturing processes since the process is identical to the injection blow molding process and secures reliability by minimizing facility costs. [Reference numerals] (AA) Core mold (Pattern formation); (BB) Injection molding (Preform); (CC) Blow molding (Preform expansion); (DD) Final object bottle

Description

METHODS FOR INJECTION BLOW MOLDING OF BOTTLE HAVING UNEVENNESS PATTERN ITS INNER SURFACE AND BOTTLE THEROF}

The present invention relates to a method for forming a container, and more particularly, to a method for producing a container having an uneven pattern on the inner surface of the container and a container having an uneven pattern on the inner surface produced thereby.

Blow Molding is used to inject molten masses of thermoplastics into the air and expand into the shape of the mold to create hollow shapes with thin walls like PET bottles. The size is limited to approximately three feet in diameter. Resin materials are used for PET, PAN, PVC, PP, etc., but they are most often used for the manufacture of PET bottles.

The above-mentioned PET is much easier to form than PP which is partially crystalline because the polymer in the amorphous state has a wide range of thermoplastics.

Such blow molding includes extrusion blow molding, injection blow molding and injection stretch (stretch) blow molding.

The first extrusion blow molding uses an extruder to melt a polymer and attaches a die to form a hollow shape, such as a hollow pipe, at the end of the extruder to make a parison. Pass the parison vertically down into the open blow mold, close the mold, cut the parison, transfer the mold to the side, and blow air into the parison. At this time, another mold goes to the place where the parison comes down to perform the next molding.

Such extrusion blow molding is suitable for grades in which the physical properties of the molten state are adjusted so that the parison does not maintain shape and sagging, and a material having a high melt strength is suitable.

The second injection blow molding is a hollow molded product called preform (also called a parison, which is called a tubular shape mainly used for extrusion blowing) by injection molding, and the mold is opened after the mold is opened. The preform embedded in the core is not blown out but transferred to the blow mold as it is, and air is blown out of the core mold to blow.

This injection blow molding is also called one stage blow molding because injection and blowing are performed at one time in a single machine.

In the third injection stretch blow molding, the preform is first molded by injection molding, and then supplied to a blow machine at another location for blow molding. This injection stretch blow molding is called two-stage blow molding. Heat the body of the preform and transfer it into the blow mold, close the mold and prepare for blow. Blow molding while stretching the preform axially using a stretching rod just before the blow in the mold to create a hollow molded part.

This injection stretch blow molding method has the effect of ensuring that the preform is axially stretched when molding a relatively long hollow article.

Injection stretch blow molding has the advantage of being able to precisely design and shape the thickness distribution of the preform since the preform is manufactured by injection molding. Most PET bottles are made by this injection stretch blow molding method.

In recent years, for the merchandise of a container manufactured by such a molding method, a container in which an uneven pattern is molded is disclosed.

The uneven pattern may be easily formed by a pattern imprinted on the outside of the container, but later, when printing various texts or brand names for product description or coating a separate printing paper. There is a disadvantage that the operation is difficult due to the irregularities formed on the outside of the container.

Therefore, in recent years, a technique for forming an uneven pattern on the inner surface of the container in order to prevent the closed end due to the external uneven pattern forming has been disclosed.

Patent documents 1 and 2 are mentioned as a source technology regarding the technique of forming an uneven | corrugated pattern in this hollow container inner surface.

Patent Document 1 is a technique applying an extrusion blow molding method, and repeatedly supplying and blocking compressed air to the inside of the extruded parison, forming the convex-convex protrusions on the inner surface of the parison in a transverse wave shape on the inner surface of the vessel. The technique which makes it is disclosed.

That is, Patent Document 1 is to form a wavy concave-convex pattern on the inner surface of the parison extruded to the nozzle by the supply and blocking of the compressed air ejected through the center of the parison extruded through the nozzle.

However, these patent documents are formed in the inner surface of the container irregularities formed in the shape of the wave inside the extrusion parison by the supply and block of the above-mentioned compressed air, the horizontal projection or longitudinal in the lateral direction by blow molding by the blow mold By forming a checkerboard projection by vertical or vertical projections in parallel to each other or horizontal and vertical projections, the diversity and compactness of the molded pattern due to simply forming the vertical and horizontal directions are not guaranteed. The product production is limited due to the time required by the control (supply and cut-off) .In case of controllable amount of compressed air, when the thickness variation of the preform occurs, the irregular pattern is formed during the blow molding and the product is caused by the variation in the thickness of the cross section. There is a disadvantage that the failure is poor practicality.

Patent document 2 is a double container structure of an inner container and an outer container, and after manufacturing the outer container to which the inner container combines by injection molding or blow molding, various patterns or logos on the inner surface of the outer container are jig-coded in a separate process. The technique of painting by this is disclosed.

The patent document 2 solves the monotony of the pattern, which is a disadvantage of the patent document 1, but the manufacturing cost is increased by accommodating a separate internal container due to the hazards caused by the coating process, the manufacturing process is not a series of processes The individual process (manufacturing of the outer container and the inner container, painting on the inner surface of the outer container, etc.) has a disadvantage in that the manufacturing process is complicated and the equipment cost is increased due to the increase in manufacturing facilities.

Patent Document 1: Republic of Korea Patent No. 10-0633386 (Registration Date: 2006.10.02) Patent Document 2: Republic of Korea Patent No. 10-0750882 (Registration Date: 2007.08.14)

The present invention is to provide a manufacturing method and a container manufactured thereby, which can effectively mold a variety of pattern patterns on the inner surface of the container while solving the above problems of the prior art.

That is, the present invention is applied to the injection blow molding method of the first stage blow molding to form a pattern of irregularities on the inner surface of the container, which is the final object,

According to the present invention, the pattern of the grooves or protrusions opposite to the inner surface of the preform is formed by the pattern pattern imprinted on the outside of the core of the core by injection molding, and the unformed pattern of the preform is formed by forming the container by blow molding the preform. To provide a method for producing a container that is molded in an expanded state and the container.

Therefore, the present invention maximizes the reduction in manufacturing cost as well as the variety of the pattern in manufacturing the pattern on the inner surface of the container, and in particular, the same as the injection blow molding process, there is no complexity in the manufacturing process and the equipment cost is also minimized and reliability is achieved. Guaranteed.

The present invention for achieving the above object,

Forming a predetermined pattern on the outer surface of the core of the core mold;

Molding hollow preforms having a concave-convex structure formed on the inner surface of the pattern pattern imprinted on the outer surface of the core by injection molding using the core;

Inserting the preform into a blow mold and molding the blown mold in a state in which the pattern formed on the inner surface of the preform is expanded by blow molding;

Method for producing a container having a concave-convex pattern on the inner surface comprising a and characterized in that it comprises a container produced thereby.

Here, the stamping of the pattern on the outer surface of the core may be understood as the shaping of the pattern of the groove structure by the etching method or the engraving method, or may be understood as the shaping of the pattern pattern protruding to the outer surface of the core.

As a result, the inner surface of the manufactured container is molded into a pattern of a concave-convex structure opposite to the pattern.

And unlike the patent document 1, such a pattern may have a non-uniform variety according to the pattern formed on the outer surface of the core.

Of course, the container molded by such a manufacturing method has a pattern of irregularities on the inner surface while the outer surface has a smooth surface by the cavity inner surface of the blow mold, and can be printed or coated by a phrase such as product description or brand name. have.

Industrial Applicability According to the present invention, it is possible to industrially produce a variety of pattern patterns on the inner surface of a hollow container, and to provide at low cost.

In addition, according to the present invention, it is possible to mold the pattern of the inner surface of the container to prevent product characteristics, thereby providing an effect of doubling the merchandise.

In addition, according to the present invention, it is possible to mass-produce the container molded on the inner surface of the container without the expansion of the existing equipment can provide to the consumer by mass-producing the container formed on the inner surface of the product can ensure the product purchase effect and product reliability have.

1 is a process block diagram showing a manufacturing process of the present invention.
Fig. 2 is a state of molding of a pattern having a groove structure as an example on the outer surface of a core of a core mold for carrying out the present invention.
3 is a view of a state in which a preform is formed by injecting a resin into a cavity of a cavity mold and injecting a resin around the core of the core mold after coupling the core mold disclosed in FIG. 2 to a neck mold.
4 is a view showing a state in which the preform is taken out from the cavity mold after the core mold is separated from the cavity of the cavity mold, using the neck mold as a support.
5 is a view of a state in which the blow mold is closed after the preform is transferred to the blow mold using the neck mold as a support.
6 is a view of a state in which the air inlet is coupled to the neck mold coupled to the blow mold.
FIG. 7 is a view of a state in which compressed air is injected through an air inlet to inflate a preform and molded into a shape inside a blow mold. FIG.
8 is a view of a state in which the air inlet is removed and the blow mold is opened to take out the molded product from the neck mold to the support.
9 is a view of a state in which the finished product is taken out by opening the neck mold after cooling and solidifying the molded article.
10 is a front view and a side view of the finished product container produced by the present invention.
11 to 14 are photographs of containers of one embodiment made by the present invention.
15 is an enlarged photograph of a part of FIG. 14 to clearly show a pattern.
16 to 20 are photographs of other embodiments produced by the present invention.

The present invention is characterized in that it is possible to industrially mass-produce various pattern patterns on the inner surface of the container without expansion of special equipment by using injection blow molding.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not to be construed as limiting of the present invention. Such simple modifications are desirably construed as falling within the technical scope of the present invention.

And components shown in the drawings for the purpose of explanation of the present invention may be simplified, omitted, or exaggerated, without affecting the rights of the present invention.

As shown in the process diagram of Figure 1, the manufacturing method of a container having an uneven pattern on the inner surface of the present invention,

Forming a pattern (P) to be molded on the outer surface of the core 110 of the core mold 100,

Preform 200 molding step in which the pattern pattern (P) of the concave-convex and concave-convex pattern is formed on the inner surface by the core 110 of the core mold 100 by injection molding,

Manufacturing a molded article 240 in which the preform 200 is blown and molded in an expanded state of the inner pattern pattern P;

The molded article 240 is cooled and solidified to produce a container 250 of the finished product.

Referring to Figure 2, the pattern pattern (P) stamped on the outer surface of the core 110 of the core mold 100 is an example of the engraving method on the surface of the metal and the etching method to etch the sketch or the engraving method to form the engraving method Or by forming a protruding pattern P by a mold and by post-treatment.

Of these, it is preferable that the patterned pattern P of the groove is applied to the etching technique having the highest workability.

As shown in FIG. 3, after the core mold 100 is coupled to the neck mold 150 and introduced into the cavity of the cavity mold 160, around the core 110 of the core mold 100, That is, the preform 200 is molded by injecting the synthetic resin by the injection machine 170 coupled to the bottom of the cavity mold 160.

Here, the neck mold 150 is separated into a gap in the left, right coupling type.

The preform 200 has one of its longitudinal ends closed and a neck portion 220 including a spiral protrusion formed by the four mold 150 at an open opposite end thereof. It is provided, and includes a substantially tubular body portion 210, the body portion 210 will have a final container shape after the injection molding operation.

The synthetic resin, which is the injection material of the preform 200, is polyethylene (PE) or nylon, EVOH (Ethylene Vinyl alcohol Copolymer, ethylene vinyl alcohol copolymer), polypropylene (PP), surlyn, PVC (polyvinyl chloride) ), PET (polyethylene terephthalate), polyamide (polyamide), polystyrene (polystyrene), including polycarbonate (polycarbonate), polyester and the like may include all the heat-melting materials suitable for injection molding.

As shown in FIG. 4, the preform 200 separates the core mold 100 from the cavity mold 160 and the neck mold 150, and then the preform 200 forms the neck mold 150. It is taken out from the cavity mold 160 as a support body.

At this time, the pattern pattern P formed on the inner surface of the body portion 210 of the preform 200 is formed with grooves or protrusions opposite to the pattern pattern P formed on the outer surface of the core 110 of the core mold 100. It is natural.

The preform 200 is injected into the blow mold 180 to manufacture a finished product container 250 having a predetermined shape by blow molding.

In addition, the blow mold 180 of the blow molding is also a pair of left and right, it is natural to form a molding space (molded product space) inside the close contact with each other at the time of blow.

This blow molding step is shown in detail in FIGS. 5 to 8.

As shown in FIG. 5, the preform 200 taken out from the cavity mold 160 moves the neck mold 150 to the blow mold 180 as a support, and then closes the blow mold 180.

Here, the left and right molds of the blow mold 180 includes a support plate 181 for molding the bottom bottom surface of the molded article 240 to be molded by combining the molded product space in the lower portion.

In addition, an air inlet 190 is disposed on the neck mold 150.

In this state, as shown in FIG. 6, the air inlet 190 is coupled to the neck mold 150 coupled to the blow mold 180.

As shown in FIG. 7, compressed air is injected through the air inlet 190 coupled to the neck mold 150. By injecting the compressed air, the preform 200 is inflated and the molded article 240 is molded to be in close contact with the inside of the blow mold 180.

The injection time of the compressed air is to be in close contact by blowing at an instantaneous pressure (20 ~ 30kg / ㎠) within the range of 4 ~ 10 seconds, the blow molding technology is a well known technique, so the detailed description is omitted.

As such, as shown in FIG. 8, the blow mold 180 is opened to separate the air inlet 190 and the support plate 181 from the blow mold 180 and the neck. The molded article 240 is taken out in a state in which the mold 150 is coupled.

The molded article 240 thus removed is cooled and solidified, and as shown in FIG. 9, the neck mold 150 is opened to manufacture a finished container 250.

At this time, the pattern pattern P formed on the inner surface of the container 250 is preferably formed in the form of a protrusion, as shown in the enlarged view.

Of course, when the pattern pattern P formed on the core 110 of the core mold 100 is formed in the form of a protrusion, the pattern pattern P is formed on the inner surface of the container 250. Naturally, P) is shaped into a groove.

The finished product container 250 formed according to the present invention, as shown in Figure 10, the neck portion formed by the neck mold 150 combined with the preform 200 is formed with a spiral protrusion is a lid for internal airtight ( Not shown).

11 to 18, according to the pattern pattern (P) imprinted on the core mold 100, such as a floral pattern of the groove structure or protrusion structure, animal pattern, etc. Various pattern patterns (P) can be molded, so that the aesthetics of the container can be maximized and the marketability can be increased.

The present invention is capable of diversifying the product to the consumer who has recently been promoting the external beauty of cosmetic containers can be very useful industrially.

100: core mold 110: core
150: neck mold 160: cavity mold
170: injection molding machine 180: blow mold
181: support plate 190: air inlet
200: preform 210: body
220: neck portion 240: molded article
250 container P pattern pattern

Claims (5)

In the manufacturing method of the container using injection blow molding,
By injection molding, a preform is formed in which an uneven pattern is formed on the inner surface.
A method of manufacturing a container having a concave-convex pattern on an inner surface, wherein the preform is inflated by blow molding to form a predetermined container molded in an expanded state of the concave-convex pattern on the inner surface.
The method of claim 1,
The preform molding,
Stamping a predetermined pattern on the outer surface of the core of the core mold;
The core mold is coupled to the neck mold and injected into the cavity mold, and resin is injected around the core mold to form a groove pattern or a pattern of the groove opposite to the pattern pattern stamped on the outer surface of the core. Forming the preform,
After separating the core mold from the cavity mold and the neck mold, the method of manufacturing a container having a concave-convex pattern on the inner surface, characterized in that the preform as a neck mold taking out the step of taking out from the cavity mold.
The method of claim 1,
The container molding is,
The preform transfers the neck mold to the blow mold as a support, and then closes the blow mold;
Coupling an air inlet to the neck mold coupled to the blow mold, and injecting compressed air into the air inlet to inflate the preform to form an outer surface in the shape of the inside of the blow mold in a state in which a pattern pattern formed on the inner surface is expanded; Wow,
Separating the air inlet and opening the blow mold to take out the molded product from the neck mold to the support;
Cooling the molded article and solidifying, and then opening the neck mold to produce a container of the finished product, the manufacturing method of the container having an uneven pattern on the inner surface.
3. The method of claim 2,
Forming a pattern on the outer surface of the core of the core mold has a concave-convex pattern on the inner surface, characterized in that the pattern of the groove structure by the etching method or the engraving method or the molded pattern of the pattern pattern protruding to the outer surface of the core is used Method for producing a container.
A container having a concave-convex pattern on an inner surface of which a groove pattern or a projection pattern is formed on the inner surface by the manufacturing method of claim 1.

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