JPH08140881A - Synthetic resin made shower molding and its molding - Google Patents

Abstract

PURPOSE: To provide a synthetic resin shower molding having a high degree of freedom for designing, having high productivity, integrated and inexpensive. CONSTITUTION: A molten resin is injected into a cavity of a die provided to an injection molding device, then a pressurized fluid is guided into the molten resin in the cavity, and an injection molding having a hollow section 10 is manufactured as a synthetic resin shower molding 1. The hollow section 10 of the synthetic resin shower molding 1 thus manufactured serves as a passage of water or warm water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin shower molded article which constitutes a shower used in a bathtub, a shower room or the like, and a molding method thereof.

[0002]

2. Description of the Related Art Showers made of synthetic resin are widely used in bathtubs, shower rooms, etc. of general households, public baths, hotels, etc. because of their light weight. A shower made of synthetic resin is a shower molded product made of synthetic resin called a shower head.
It is composed of a shower nozzle (also referred to as a shower outlet) attached to the front end of the shower molded product, and a hose attached to the rear end of the shower molded product.

Generally, the shape of a synthetic resin shower molded product is a curved tube. Further, a method of simultaneously forming a flow path of water or hot water required as a shower function at the time of injection molding of a shower molded product made of a synthetic resin is not usually taken. Generally, a shower molded article made of synthetic resin is produced by molding a plurality of shower molded article members made of synthetic resin by an injection molding method and then adhering these shower molded article members together, for example. Alternatively, in order to form a flow path for water or hot water, a nest is provided in the cavity of the mold, and then a molten resin is injected into the cavity to form a flow path in a portion corresponding to the nest. A method of molding the synthetic resin shower molded product to be formed is also conceivable.

[0004]

However, in the method of manufacturing a synthetic resin shower molded product by assembling a plurality of synthetic resin shower molded product members, an increase in manufacturing cost due to an increase in the number of parts is unavoidable. However, there is a problem that assembly work is required. In the method of forming the flow path by arranging the insert in the cavity of the mold, after forming the synthetic resin shower molded product, the insert is removed from the synthetic resin shower molded product, and the removed insert is removed. It has to be redistributed in the cavity of the mold for the next molding cycle, resulting in poor productivity. Furthermore, in these methods, since a plurality of synthetic resin shower molded product members need to be assembled or nested to form a flow path, the synthetic resin shower molded product can be designed freely. There is a big problem of low degree.

Therefore, it is an object of the present invention to provide an inexpensive synthetic resin shower molded article which has a high degree of freedom in design, high productivity and is integrated, and a molding method thereof.

[0006]

A synthetic resin shower molded article according to the present invention for achieving the above object is melted in a cavity by using an injection molding apparatus equipped with a mold provided with a cavity. It is made by injection molding method to produce injection molded product with hollow part by injecting pressurized fluid into the molten resin in the cavity after injecting the resin, and formed into a synthetic resin shower molded product. The hollow portion constitutes a flow path for water or hot water. here,
The fact that the hollow portion constitutes a flow path of water or hot water does not only mean that the hollow portion forms the entire flow path of water or hot water, but also that it forms a part of such flow path. means.

In the synthetic resin shower molded product of the present invention, the pressurized fluid introducing portion is disposed substantially in the axial direction of the hollow portion formed in the synthetic resin shower molded product, and the molten resin injection portion is the synthetic resin. It is preferable to use a mold arranged in a direction substantially perpendicular to the axis of the hollow portion formed in the shower-molded product. In the mold, by arranging the pressurized fluid introduction part in the direction substantially axial of the hollow part formed in the shower molded product made of synthetic resin, the desired hollow part forming the flow path of water or warm water is made of synthetic resin. It is formed almost at the center of the shower molded product. On the other hand, in the mold, by arranging the molten resin injection part in a direction substantially perpendicular to the axis of the hollow portion formed in the shower molded product made of synthetic resin, the molten resin is injected from the molten resin injection part into the cavity of the mold. When injected into the cavity, the flow of the molten resin hits the mold surface of the cavity, so that the flow of the resin in the cavity becomes turbulent. As a result, jetting and generation of flow marks can be avoided, and the appearance characteristics of the synthetic resin shower molded product can be improved. Incidentally, the relationship between the pressurized fluid introducing portion and the molten resin injecting portion and the axial direction of the hollow portion need not be strictly parallel and right angles.

In this case, it is more preferable that the spiral screw portion is formed in the portion of the synthetic resin shower molded product corresponding to the vicinity of the pressurized fluid introducing portion. By providing the spiral threaded portion, it is possible to easily screw the pipe and the hose to be connected to the synthetic resin shower molded product, which is extremely practical.

In order to achieve the above-mentioned object, the method for molding a synthetic resin shower molded article according to the present invention uses an injection molding apparatus equipped with a mold provided with a cavity, and melts the molten resin in the cavity. After the injection, a pressurized fluid is introduced into the molten resin in the cavity to form a hollow portion forming a flow path of water or hot water in the resin in the cavity. The injection molding method called the sympress molding method (gas assist method) is basically applied to the molding method of the synthetic resin shower molded article of the present invention.

In the method for molding a synthetic resin shower molded article according to the present invention, the pressurized fluid introducing portion is disposed substantially in the axial direction of the hollow portion formed in the synthetic resin shower molded article, and the molten resin injection portion is provided. It is preferable to use a mold disposed in a direction substantially perpendicular to the axis of the hollow portion formed in the synthetic resin shower molded product.

In this case, it is more preferable to use a mold in which a spiral screw forming part is provided on the mold surface of the cavity near the pressurized fluid introducing part. By using such a mold, a spiral screw portion capable of screwing a pipe or a hose to be connected to the synthetic resin shower molded product can be easily and integrally formed with the synthetic resin shower molded product. Further, by providing the spiral screw forming portion on the mold surface of the cavity, when the pressurized fluid is introduced into the molten resin in the cavity, a part of the molten resin previously injected into the cavity is formed by the spiral screw forming portion. Surely stops at. That is, the so-called anchor effect is exerted on a part of the molten resin previously injected into the cavity by the spiral screw forming portion.
As a result, it is possible to prevent the molten resin in the vicinity of the pressurized fluid introducing portion from being blown off by the pressurized fluid, and it is possible to reliably form the hollow portion. Further, a shower molded product made of synthetic resin can be manufactured in a continuous and stable molding cycle.

The resin applicable to the production of the synthetic resin shower molded product of the present invention is not particularly limited, and injection-moldable resins, more specifically, thermoplastic resins, thermoplastic elastomers, alloys thereof, and heat It may be appropriately selected from curable resins, but in particular, chemicals (synthetic detergents, synthetic chemicals, hair dressing, hair color, etc.) because synthetic resin shower molded products are used for faucet parts such as bathtubs and shower rooms. Since engineering plastics are required, it is preferable to use engineering plastics. For example, polyacetal resin, nylon resin, polybutylene terephthalate (P
Crystalline resin such as BT resin, polycarbonate resin,
Amorphous resins such as modified PPE resins, or chemical resistance improving grades of these resins can be mentioned. Also,
If desired, materials obtained by blending these resins with fiber reinforcement, fillers, stabilizers, etc. can also be used.

In molding the synthetic resin shower-molded article of the present invention, the amount of molten resin, temperature, pressure or injection speed, amount of pressurized fluid to be introduced, pressure or speed, cooling time of the mold during injection molding. Various conditions such as the above must be appropriately selected and controlled depending on the type of resin used, the shape of the mold, and the like, and cannot be uniquely determined.

As the pressurized fluid to be introduced, gaseous substances such as nitrogen gas, carbon dioxide gas, air and helium gas at room temperature can be used, but gas liquefied under high pressure may also be included.

After the cavity of the mold is completely filled with the molten resin, a pressurized fluid may be introduced into the molten resin in the cavity, but the weight of the synthetic resin shower molded product and the hollow of a large volume may be improved. From the viewpoint of forming parts, after injecting a molten resin in an amount smaller than the volume of the mold cavity into the cavity, a pressurized fluid is introduced into the molten resin in the cavity, or It is desirable to introduce the pressurized fluid into the molten resin in the cavity while injecting the molten resin in an amount smaller than the volume of the cavity into the cavity.

[0016]

In the present invention, since it is possible to integrally mold a synthetic resin shower molded product having a hollow portion forming a water or hot water flow path, the synthetic resin shower molded product is There are no design restrictions. Further, it is not necessary to assemble a plurality of synthetic resin shower molded product members, it is possible to avoid an increase in the number of parts and an increase in manufacturing cost due to assembly work, and it is possible to manufacture an inexpensive synthetic resin shower molded product. . Alternatively, it is not necessary to place the insert in the mold cavity.

[0017]

EXAMPLES Hereinafter, a synthetic resin shower molded article of the present invention and a molding method thereof will be described based on Examples with reference to FIGS. 1 and 2.

FIG. 1 is a schematic sectional view of a synthetic resin shower molded article 1 of the present invention. The shower molded article 1 made of synthetic resin according to the present invention has a hollow portion 10 which constitutes a flow path of water or hot water.
have. In the synthetic resin shower molded product 1 shown in FIG. 1, the hollow portion 10 forms a part of the flow path of water or hot water. In FIG. 1, the arrow “A” indicates the position of the pressurized fluid introducing portion arranged in the mold. The arrow “B” indicates the position of the molten resin injecting portion arranged in the mold. The pressurized fluid introduction part is a synthetic resin shower molding 1
It is arranged in the hollow portion formed in the substantially axial direction. On the other hand, the molten resin injecting portion is arranged substantially perpendicular to the axis of the hollow portion formed in the synthetic resin shower molded product 1. In addition, in FIG. 1, the axis of the hollow portion is indicated by a chain line L. In the embodiment, the spiral screw portion 14 is formed in the portion 12 of the synthetic resin shower molded product 1 corresponding to the vicinity of the pressurized fluid introduction portion.

FIG. 2 is a schematic sectional view showing the structure of a mold 20 for molding the shower-molded synthetic resin product 1 shown in FIG. The mold 20 is provided with a cavity 22. Furthermore, the pressurized fluid introducing portion 24 and the molten resin injecting portion (gate portion) 26, which are opened toward the cavity 22,
It is arranged in the mold 20. A spiral screw forming portion 28 is provided on the mold surface of the cavity 22 in the vicinity of the pressurized fluid introducing portion 24.

A pressurized fluid injection nozzle 30 is provided so as to be in contact with the pressurized fluid introducing portion 24. In order to prevent the molten resin from flowing into the pressurized fluid injection nozzle 30,
A check valve 32 is provided at the tip of the pressurized fluid injection nozzle 30. The pressurized fluid injection nozzle 30 is connected to a pressurized fluid source (these are not shown) via a pipe. The pressurized fluid injection nozzle 30 is moved forward and backward by a hydraulic cylinder (not shown) for driving the nozzle. When introducing the pressurized fluid into the molten resin in the cavity 22, the pressurized fluid injection nozzle 30 occupies the forward position, and the pressurized fluid introducing part 2
Contact 4 On the other hand, when the pressurized fluid is discharged from the hollow portion of the synthetic resin shower molded product molded in the cavity, the pressurized fluid injection nozzle 30 occupies the retracted position and is separated from the pressurized fluid introducing portion 24.

The molten resin injection section 26 communicates with an injection cylinder (these are not shown) via a runner section and a sprue section. When a thermoplastic resin is used as the resin, while the resin is heated and plasticized in the injection cylinder, the resin applied by the injection cylinder is
It is injected into the cavity 22 of the mold 20 through the runner portion and the molten resin injection portion 26.

In the examples, polyacetal resin (manufactured by Mitsubishi Engineering Plastics Co., Ltd., trade name: Iupital F30 natural color) was used as the resin.
Then, at a resin temperature of 200 ° C in the injection cylinder,
It was melted and plasticized in advance.

After the mold was clamped, the pressurized fluid injection nozzle 30 was advanced and brought into contact with the pressurized fluid introduction part 24 of the mold 20. Then, the molten resin was injected into the cavity 22 of the mold 20 through the molten resin injection portion (gate portion) 26. After injecting a predetermined amount of molten polyacetal resin, the injection operation was stopped. The amount of the molten resin injected was such that the cavity 22 was not completely filled. Immediately thereafter, a pressurized fluid composed of compressed nitrogen gas was introduced into the molten resin in the cavity 22 from the pressurized fluid injection nozzle 30 via the pressurized fluid introduction part 24. Then, after the resin in the cavity 22 is cooled and solidified for a predetermined time,
The pressurized fluid injection nozzle 30 is retracted, and the pressurized fluid introduction unit 2
Away from four. As a result, the pressurized fluid was discharged into the atmosphere from the hollow portion of the synthetic resin shower molded product molded in the cavity 22 through the pressurized fluid introducing portion 24. Finally, the mold was opened and the shower molded article 1 made of synthetic resin was taken out from the mold.

As shown in FIG. 1, the obtained synthetic resin shower molded article 1 had a hollow portion 10 forming a flow path for water or hot water. This hollow portion 10 is a mold 2
It extends from one end portion 16A of the synthetic resin shower molded product facing the pressurized fluid introduction part 24 of 0 to the vicinity of the other end portion 16B of the synthetic resin shower molded product. After the synthetic resin shower molded article 1 is molded, the synthetic resin shower molded article 1 is cut by cutting the synthetic resin shower molded article 18 from the other end 16B to the hollow portion 10 of the synthetic resin shower molded article. It is possible to form a flow path that communicates from one end portion 16A to the other end portion 16B. A shower nozzle (shower discharge port) is attached to the other end portion 16B of the synthetic resin shower molded product thus formed, and the spiral screw portion 1 is attached to the spiral screw portion 14 of the synthetic resin shower molded product 1.
A shower made of synthetic resin can be obtained by attaching a hose or a pipe that is screwed to the No. 4 pipe.

Although the present invention has been described based on the preferred embodiment, the present invention is not limited to this embodiment. The shapes and structures of the synthetic resin shower molded products described in the examples are merely examples, and can be changed as appropriate. In addition, various conditions in the molding method of the synthetic resin shower molded product described in the examples are also examples, and can be appropriately changed. Depending on the structure of the synthetic resin shower molded product, the pressurized fluid introducing portion may be provided also in the portion of the mold facing the other end 16B of the synthetic resin shower molded product. As a result, if the pressurized fluid is introduced into the molten resin in the cavity, one end portion 1 of the shower molded product made of synthetic resin
It is possible to form a hollow portion which is a flow path communicating from 6A to the other end portion 16B.

[0026]

According to the present invention, since the formed hollow portion constitutes the flow path of water or hot water, it is possible to integrally mold the shower molded product made of synthetic resin, and to design the shower molded product made of synthetic resin. The constraint of is gone. Moreover, it is possible to provide an inexpensive synthetic resin shower molded article having excellent chemical resistance and the like. Furthermore, since the injection molding method is basically applied, the productivity is high.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a synthetic resin shower molded product of the present invention.

FIG. 2 is a schematic cross-sectional view of a mold for molding a synthetic resin shower molded product of the present invention.

[Explanation of symbols]

1 Shower molded product made of synthetic resin 10 Hollow part 12 Part of shower molded product made of synthetic resin corresponding to the vicinity of pressurized fluid introducing part 14 Helical screw part 20 Mold 22 Cavity 24 Pressurized fluid introducing part 26 Molten resin injecting part ( Gate part) 28 spiral screw forming part 30 runner part 32 sprue part 30 pressurized fluid injection nozzle 32 check valve

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Akinasa Kaneishi 5-6-2 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Sanryo Engineering Plastics Co., Ltd. Technical Center

Claims (8)

[Claims] 1. An injection molding apparatus provided with a mold provided with a cavity is used to inject a molten resin into the cavity and then introduce a pressurized fluid into the molten resin in the cavity, A synthetic resin shower molded article manufactured by an injection molding method for producing an injection molded article having a hollow portion, wherein the hollow portion formed in the synthetic resin shower molded article constitutes a flow path of water or hot water. A shower molded product made of synthetic resin, which is characterized in that 2. A pressurized fluid introducing portion is disposed substantially in the axial direction of a hollow portion formed in a synthetic resin shower molded product, and a molten resin injection portion is formed in a synthetic resin shower molded product. 2. The shower molded article made of synthetic resin according to claim 1, wherein a mold disposed in a direction substantially perpendicular to the axis of is used. 3. The synthetic resin shower molded product according to claim 2, wherein a spiral screw portion is formed in a portion of the synthetic resin shower molded product corresponding to the vicinity of the pressurized fluid introducing portion. . 4. The synthetic resin shower-molded article according to claim 1, wherein the resin is made of polyacetal. 5. An injection molding apparatus equipped with a mold provided with a cavity is used to inject a molten resin into the cavity, and then a pressurized fluid is introduced into the molten resin in the cavity to prepare a water solution. Alternatively, a method for molding a shower molded article made of synthetic resin, characterized in that a hollow portion constituting a flow path of hot water is formed in a resin in a cavity. 6. A pressurizing fluid introducing portion is disposed substantially in the axial direction of a hollow portion formed in the synthetic resin shower molded product, and a molten resin injection portion is formed in the synthetic resin shower molded product. The method for molding a synthetic resin shower molded article according to claim 5, wherein a mold arranged in a direction substantially perpendicular to the axis of is used. 7. The synthetic resin shower molded product according to claim 6, wherein a mold having a spiral screw forming portion provided on a mold surface of a cavity in the vicinity of the pressurized fluid introducing portion is used. Molding method. 8. The method for molding a synthetic resin shower molded article according to claim 5, wherein the resin is made of polyacetal.