KR200189000Y1 - Apparatus of injection blow forming of plastic product - Google Patents

Abstract

The present invention relates to an injection blow molding apparatus for plastic products. First, each part is separable from each other to facilitate injection, injection and extraction of materials, and a parison mold having a narrow cross section is formed in the middle of the injection process. Inject the listen product, and before the injected parison product undergoes the blow mold process described below, the rotating and revolving are simultaneously passed through a preheater that can be preheated uniformly. The blow mold machine is provided with a separate air inlet for easy separation, and the separation of each part is possible. The material injection into the parison mold and the separation of the molded parison product are easy by the stripper mold. It is easy to inject air into the blow mold, and the injected air L and referred to as the product is listening at the same time as the injection blow density and thickness of each portion of the molded product a certain equipment cost small and easy to diversified mass production, has the effect that can adjust the speed of production of plastic products.

Description

Apparatus of Injection blow forming of plastic product}

The present invention relates to an injection blow molding apparatus for a plastic product, and more specifically, first, each part is separable from each other and a narrow cross-sectional area is formed in the middle of the injection process so as to facilitate injection, material injection and extraction. Parison product is injected into the parison mold, and the injected parison product passes through a preheater that can be preheated uniformly by rotating and revolving at the same time before going through the blow mold process. The blow mold machine is provided with a separate air inlet for easy product extraction and is capable of separating each part, so that material injection into the parison mold and separation of the molded parison product can be easily carried out by the stripper mold. It is easy to inject air into the blow mold and the injected air is parryed evenly. Injection blow molding apparatus for plastic products that can control the production speed of plastic products with small equipment cost, easy to mass production of various kinds of products, and uniform density and thickness of each part of injection blow molded products It is about.

As a manufacturing method using a conventional injection blow molding apparatus, as shown in FIG. 1, first, a neck mold 2 for forming a neck portion is attached, and a core mold 3 and a cavity mold 1 are attached to the core mold. (3) The resin is injected around to form a parison, and then the parison (4) is transferred from the cavity mold (1) to the blow mold (5) with the core mold (3) as a support, and then the blow mold is removed. The air inlet 6 installed in the core mold 3 is sweetened by blowing air into the mold, and after cooling, the neck mold 2 and the blow mold 5 are opened to take out the finished product 8.

However, the conventional injection blow molding apparatus has a smaller area as the shape of the material injection hole 7 becomes conical, so that the purpose of preheating the parison mold can be easily achieved, but the material injection is not easy. The production of fine, deep or large products has had difficult problems.

In addition, in the conventional parison mold apparatus, the material easily enters the air inlet 6 of the core mold 3, which is also used in the blow mold. Since apparatuses are required, and apparatuses are required for the material to be injected into the tip of the material inlet where the area of the parison mold is very narrow, there is a problem that the equipment cost becomes large as a result.

Furthermore, in the conventional blow mold, there is no preheating process, so the blow mold takes a long time, the air pressure to be injected is increased, and as the air pressure increases, the mold is unevenly formed, and there is a complicated process of taking out the product.

The present invention has been made to solve the above problems, the object of the present invention is easy to inject the material into the parison mold and detached molded parison products, easy to inject air into the blow mold, injected air By calling parison products evenly, the injection blow molding of plastic products that can control the production speed of plastic products with low equipment cost, easy to mass production of various types, and control the density of each part of the injection blow molded products are uniform. To provide a device.

In order to achieve the above object, the present invention first injects a parison product into a parison mold in which each part is separable from each other and a narrow cross-section is placed in the middle of the injection process so as to facilitate injection and material injection. The device is configured to be uniformly preheated by rotating and revolving at the same time before the injection molding parison product goes through the blow molding process.Afterwards, a separate air injector is provided to facilitate air injection and product extraction from the blow mold. Characterized in that configured to be possible.

1 is a manufacturing process diagram by a conventional injection blow molding apparatus,

2 is a manufacturing process diagram by the injection blow molding apparatus of the present invention.

※ Explanation of code for main part of drawing

10 parison mold 11: fixed side attachment plate

12: movable side attachment plate 13: core mold

14: stripper mold 15: cavity mold

16 material inlet 17 material molding part

20: parison product 30: heating furnace

31: external disc 32: internal disc

33: axis 34: parison support plate

36: heater 40: blow mold

41: lid 42: chucking ring

43: fixed side blow mold 44: movable side blow mold

45: air inlet

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

Figure 2 is a manufacturing process diagram by the injection blow molding apparatus of the present invention, as shown in the apparatus of the present invention is a parison mold process, the separation process of the parison product, preheat softening process by the heating furnace, blow mold process, blow mold It is used in the process of taking out the product from the product.

Apparatus of the present invention in parison mold process

The core mold 13, the stripper mold 14, and the cavity mold 15 are interposed between the upper fixed side attaching plate 11 and the lower movable side attaching plate 12 from the upper portion of the cavity mold 15. The parison is molded by injecting and injecting a plastic resin as a material.

The plastic resin used in the present invention may be a material having excellent durability, heat resistance or impact resistance, if necessary, depending on the intended use of the final product. If necessary, additives such as hardeners, antistatic agents, plasticizers and lubricants may be mixed to improve the performance of the final product.

On the other hand, in the present invention, the shape of the material inlet 16 in the cavity mold is a conventional simple Contrary to the conical shape, the portion having the smallest cross-sectional area is shown as halfway between the top of the material inlet 16 and the top of the material forming part 17, while at the same time fully achieving the effect of preheating for the parison mold. It is easy to inject the material, and the cold slug well is applied to the upper end of the core mold 13 as shown in the figure so that the injected material is evenly distributed according to its volume in each part in the material forming part, and the gate density is prevented from being lowered. At the same time, precise parison products can be molded. That is, generally, the upper portion of the cavity mold 15 has a material injector nozzle (not shown) that applies a significant pressure to the material inlet 16. The portion of the material inlet 16 having the smallest cross-sectional area is the portion of the material injector. Compared with the cross-sectional area, the injected material has a narrow cross-sectional area, so that the temperature of the injected material can only be increased at the minimum cross-sectional area of the material inlet 16, so that the effect of preheating is sufficiently achieved, and the lower portion of the minimum cross-sectional area is gradually lowered. Due to the large cross-sectional area, the material injected into the material forming part 17 is rapidly and evenly dispersed in the material forming part, thereby attracting the material above the minimum cross-sectional area to the portion of the minimum cross-sectional area, i.e., the bottom, resulting in material injection. It is configured to be easy.

The cross section of the material inlet 16 may be formed in a square or a circle as necessary.

Apparatus of the present invention in the extraction process of parison product

In the present invention, the parison molded product 20 can be easily detached from the cavity mold and core mold of the parison mold 10 by operating each component of the parison mold unlike the conventional art. In addition, in the present invention, the core mold can be easily separated and taken out from the cavity mold after the parison molding, and is manufactured by giving a sufficient subtraction gradient of about 2 ° to 5 ° from the top to the bottom, as well as the molded parison product. A separate stripper die 14 is configured to be separated from the core die 13 so as to be easily taken out from the core die 13 of the parison die 10.

The parison mold parts can be separated from each other, so that various types of stripper molds and cavity molds can be assembled and stored in various ways according to the shape of the plastic product to be produced. To act.

Apparatus of the present invention in preheat softening process by heating furnace

In the present invention, the heating furnace 30 is provided as shown in the cross-sectional view shown in FIG. As shown, a circular furnace is provided with an outer disk 31 having a large outer diameter and an inner disk 32 having a small outer diameter, and the centers of the outer disk 31 and the inner disk 32 are shafts. The shaft 33 is coupled to the shaft of the motor for the rotational movement of the inner disk and the outer disk, respectively. That is, the inner diameters of the outer disk 31 and the inner disk 32 are different, and each motor shaft is configured separately. The heater 36 is mounted around the outer disk, and the number of the heaters is preferably four in the case of 220 Volt single phase, three in the 220 Volt three phase, and three in the 380 Volt. . On the outer disk, a round parison support plate 34 is inserted / coupled to which the lower end of the sectional area of the parison product is inserted and the inserted parison product is rotatable. At the top of the outer disk is disposed an inner disk 32 whose outer diameter abuts the outer surface of the parison product inserted into the parison support plate 34 so that the parison product can rotate according to its rotation.

As shown in the drawing, when the outer disk 31 rotates in the counterclockwise direction, the inner disk rotates in the clockwise direction so that the parison support plate 34 and the parison support plate 34 inserted in close contact with the inner disk are inserted. When the listen product is rotated counterclockwise and the counterclockwise rotation of the outer disc is rotated in the clockwise direction, the parison support plate and the parison product inserted into the support plate are counterclockwise. Will rotate. In addition, a blowing means (not shown) such as a fan and a fan is provided at the center of the uppermost part of the inside of the heating furnace 30 to uniformly preheat the parison product together with the above-described idle and rotation, so that the blow mold may be uniformly described below. It serves to contribute to the molding.

The above-described bar is a description of the first stage, and the upper and lower parts in the same configuration in accordance with the amount of the product to be produced in multiple stages to facilitate mass production, the size and shape of the product to be produced Depending on the size and shape of the parison base plate can be easily produced in a variety of varieties.

A heater control box (not shown) is connected to the heater 36 to adjust the temperature of preheating as needed. The control means is also connected to and provided with the motor to rotate and idle the parison product. Can be adjusted.

Withdrawal and storage of parison products may be accomplished by personnel wearing gloves through the doors formed on one side of the furnace, or by using attachment means such as tongs.

Apparatus of the present invention in blow mold process

The parison product preheated by the preheat softening process is placed in the blow mold 40 as shown in FIG. 2, the lid 41 is covered, and then the air is blown to mold the product.

As shown in FIG. 2, the blow mold 40 includes a chucking ring 42, a fixed blow mold 43, and a movable blow mold 44 in addition to the lid 41. Detachable, the size and shape of the product to be produced can be varied.

In addition, an air cylinder (not shown) is attached to both sides of the movable blow mold 44 and the chucking ring 42 for ease of product extraction, which will be described later, and the air inlet 45 inside the lid 41 is provided with air pressure. An air pressure regulator (not shown) is connected to adjust the pressure.

The injection of air in the blow mold of the present invention is performed by providing a separate air inlet in the upper lid, as compared with supplying compressed air through the air inlet inside the conventional core mold. The escaped air is a component that can apply the expansion pressure evenly to the inner surface of the parison product to be molded. Therefore, the air injection process of the present invention, in addition to the preheating softening process, it is possible to make the thickness and density of the product after expansion, to reduce the required air pressure, and to facilitate the control of the air pressure .

The air pressure required for the blow mold depends on the degree of preheat softening and the production speed of the required product, but it is generally in the range of 1.2-2.5 kg _f / cm2, and the time required for the blow mold is Depending on size, it is typically between 20 sec-3 min. That is, the air pressure of the blow mold process together with the preheating speed and the preheating temperature of the preheating softening process serve to control the output of the product.

Apparatus of the present invention in the product takeout process

The blow molded product is taken out by separating each part of the blow mold 40 in the following order as shown in FIG.

That is, first, the lid 41 is raised to the upper side, the second chucking ring 42 is opened to both sides through the air cylinder, and then the movable side blow mold 44 is moved downward to take out the product.

The temperature at which the final blow-molded product is taken out is generally about 60 ° C to 70 ° C.

As described above, the present invention

First, in the composition of the parison mold, the material injected into the material forming part is quickly and evenly distributed, thereby strongly attracting the material of the minimum cross-sectional area toward the minimum cross-sectional area, i.e., the lower portion of the parison mold. Has,

Secondly, compared to the prior art, since the stripper mold which is present separately is configured to be separated from the core mold, the molded parison can be easily taken out from the parison mold, and the various shapes according to the shape of the plastic product to be produced It is also possible to assemble and store the stripper mold, cavator mold, blow mold, etc. by itself, and the size and shape of the parison base plate can be different depending on the size and shape of the plastic product to be produced. Has an easy effect,

Third, the heating furnace of the preheat softening process is made in multiple stages according to the quantity of the product to be produced, and thus has an easy effect in mass production.

Fourth, since the blow mold of the present invention is configured to apply the expansion pressure of air evenly to the inner surface of the parison product to be blow molded as compared with the supply of compressed air through the air inlet in the conventional core mold Along with the preheat softening process, the product can have a constant thickness and density after expansion, lower the required air pressure, and facilitate the control of the air pressure.

Fifth, the uniform preheating speed and preheating temperature can be easily controlled in the preheating softening process, and the air pressure can be easily adjusted in the blow molding process, resulting in the effect of controlling the product yield.

The injection blow molding method of the present invention described above may be applied to produce a variety of plastic products, such as a lamp cover, a fish tank, a food container made of heat-resistant plastic, such as acrylic, polycarbonate.

Claims (3)

Fixed side attachment plate 11 at the top, movable side attachment plate 12 at the bottom, and between the fixed side attachment plate 11 and the movable side attachment plate 12 from the bottom to separate the plastic resin from the parison die and the mold. A parison mold 10 which is assembled with a core mold 13, a stripper mold 14, and a cavity mold 15 in order to facilitate separation thereof; An outer disk 31 having a shaft 33 at its center and having a large rotatable outer diameter and an inner disk 32 having a small outer diameter; A heater 36 and a heater control box for heating; A heating furnace 30 for preheating comprising blowing means for uniform preheating; A lid 41 having an air inlet 45 formed therein, a chucking ring 42 detachable from the lid 41, a fixed side blow mold 43 which is a body to which the preheat softened Parison product is blown, and the fixing Injection blow molding of plastic products, including a blow mold 40 which is assembled to the side blow mold 43 and which is movable from the fixed side blow mold 43 to the movable side blow mold 44. Device. The method of claim 1, In the cavity mold 15 of the parison mold 10, a material molding part 17 and a material injection hole 16 are formed. The material injection part 17 facilitates preheating and material injection, and the material is injected. Where the smallest cross-sectional area is located in the middle of the top of the material forming part 17 and the top of the material inlet 16 to be evenly distributed in each part of the inside Injection blow molding apparatus for plastic products, characterized in that. The method of claim 1, The parison product is inserted on the outer disk 31 of the heating furnace 30, and the round parison support plate 34 is formed such that the inserted products can revolve together according to the revolution of the outer disk 31. Is attached, and an outer circumferential surface of the inner disk 32 is in contact with the parison support plate 34 so that the inner disk 32 can rotate in accordance with the revolution of the inner disk 32. Injection blow molding apparatus for plastic products.