JPH0825400A - Molded object having fluid passage therein and water supply device - Google Patents

Abstract

PURPOSE:To utilize a gas channel as a fluid passage by newly providing the fluid entrance and exit connected to the gas channel to a molded object. CONSTITUTION:A polyacetal resin is used and molded by a gas support injection molding method to produce a plate-shaped molded object having the projection of a longitudinal rib part 2 and the projection of a lateral rib 3. The rib parts 2, 3 of this molded object have crossed gas channels 4 communicating each other therein and also have gas injection ports 5 molded at the time of gas support injection molding. Holes 6 are bored in the rib parts at four places by a drill. A water supply device A of plant cultivation equipment having the gas injection ports 5 as water inlets and the holes 6 as water outlets and the gas channels 4 as water passages is constituted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded product having a fluid passage therein and its use. More specifically, the present invention relates to a molded article having a fluid flow path inside, in which a gas channel of a molded article molded by a gas assisted injection molding method can be used as a fluid flow path.

[0002]

2. Description of the Related Art The gas assisted injection molding method (gas assisted injection molding method), which was developed for the purpose of preventing sink marks of thick plastic moldings, has been reviewed as a technology that can be applied to the molding of complex large-sized products. , Is again in the spotlight.

In the gas assisted injection molding method, a fixed amount of molten resin is injected and injected into a closed mold (short shot),
Immediately after that, an inert gas such as nitrogen gas is injected into the molten resin from the tip nozzle of the injection molding machine or a needle provided in a part of the die, and the molten resin is adhered to the inner wall of the die, This is a molding method in which the gas pressure is maintained until cooling and solidification, and after cooling is completed, the gas is released to take out the molded body. As a result, the gas channel (gas passage) formed by the inflow of the inert gas in the thick portion such as the rib portion
As a result, it is possible to prevent sink marks that are likely to occur when the thick portion is cooled and solidified. Also, pressurize evenly at low pressure.
Since it is retained, the residual stress becomes small, and it is also effective in preventing warpage of the molded body. Further, since it is a low-pressure molding, it has a feature that a large molded body can be molded only by attaching a gas unit to a conventional injection molding machine.

[0004]

As described above, the gas-assisted injection molding method is extremely effective for molding a complicated molded body or a large molded body. However, the inside of the molded body thus obtained is The effective use of the formed gas channel, particularly the positive use as a fluid flow path, has not been reported so far.

On the other hand, conventionally, a method of supplying a fluid such as a gas or a liquid to a specific position in the apparatus or between the apparatuses has been carried out via a conductor such as a pipe, a hose or a tube. There are various purposes, such as heating,
For example, cooling and supply of reaction raw materials. Then, usually, the device and the conductor were manufactured separately, and sealed and connected by a connector or the like. In this case, since the conductor is attached separately from the device, the device as a whole becomes complicated and bulky,
This has led to higher costs and larger equipment.

[0006]

Means for Solving the Problems The inventors of the present invention have earnestly studied the positive use of gas channels already formed inside a molded body molded by a gas-assisted injection molding method, and as a result, have newly developed a fluid inlet / outlet port. By providing one or more locations on the molded body, it can be used as various fluid flow paths according to various shapes of the channels in the molded body, and instead of the conductor for supplying fluid to the above-mentioned device, the molded body itself as a device They have found that they can have functions, and have completed the present invention.

That is, the present invention is characterized in that a molded body having a gas channel therein formed by a gas assisted injection molding method is provided with at least one new fluid inlet / outlet connected to the gas channel. The present invention relates to a molded product having a fluid channel inside. The present invention also relates to a molded body having the fluid flow passage formed therein, the gas channel being formed in a rib portion. The present invention also relates to the above-mentioned molded product, wherein the fluid is a liquid. Furthermore, the present invention relates to a water supply device for a plant cultivation facility, which utilizes the molded body. Hereinafter, the present invention will be described in detail.

The material resin, molding conditions, size of the molded product molded by the gas assisted injection molding method to which the present invention is applied,
The shape is not particularly limited. Various material resins, shapes, and the like can be adopted depending on the use as a fluid channel. As material resins, polyolefin resins such as polyethylene and polypropylene, halogen-containing resins such as polyvinyl chloride and polyvinylidene chloride, polyester,
Examples of the thermoplastic resin include polyamide, polycarbonate, polyvinyl acetate, polyacetal, polystyrene, ABS resin, and polymethylmethacrylate. A thermosetting resin may be used as long as it can be molded by the gas assisted injection molding method. Glass fibers, various fillers, stabilizers and the like may be added to these resins. Gas-assisted injection molding conditions are not limited as long as gas channels are formed inside the molded body. The shape of the molded body may be, for example, a plate shape having a predetermined thickness and a rib portion for reinforcement in which a gas channel passes through a predetermined portion, or the gas channel passes through the entire body. It may be a frame-shaped molded body or the like, and is not particularly limited as long as it has a more complicated shape as long as it is molded by the gas assisted injection molding method.

The molded product molded by the gas assisted injection molding method has a gas channel and a gas injection port which are formed at the time of molding. Therefore, this gas injection port can be used as it is as either the inlet for injecting the fluid or the outlet for discharging the fluid of the molded article of the present invention. In this case, if at least one new fluid inlet / outlet port is provided,
A fluid can flow through the gas channel as a fluid flow path. In that case, the size may be appropriately changed to a size suitable for the inlet and outlet depending on the flow rate of the fluid flowing through the gas inlet. A drilling tool such as a drill is used for the change. Alternatively, a cap may be attached to adjust the size. Alternatively, a preformed gas injection port may be sealed, and one or more, that is, two or more, holes may be drilled as fluid inlets / outlets so as to be newly connected to the gas channel. The number of inlets and outlets for the fluid, the size and the position of the diameter thereof are appropriately determined depending on the use of the molded body having the fluid passage of the present invention therein, the purpose of flowing the fluid, and the like.

The fluid flowing through the gas channel of the molded article of the present invention may be either liquid or gas depending on the purpose of use of the molded article, as long as the fluid does not attack the material of the molded article, but it should be liquid. Is preferred.

The molded article having the fluid channel of the present invention therein can be easily obtained by drilling the fluid inlet and outlet so as to be connected to the channel already formed as the gas channel as described above. . There are various applications for the molded article thus obtained. For example, a heating device, an oil supply device, a cooling device, a bubbling device, a water supply device and the like can be mentioned, but it is particularly preferable to use them as a water supply device for plant cultivation equipment.

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.

[0013]

【Example】

(Example 1: Water supply device for plant cultivation equipment) A polyacetal resin is used, and a gas-assisted injection molding method shown in FIG.
A plate-shaped molded body 1B having 0 × 300 mm, a thickness of 3 mm, and a protrusion of the rib portion 2 in the vertical direction in the drawing and a protrusion of the rib portion 3 in the horizontal direction in the drawing (each protrusion thickness 5 mm) was obtained. Figure 2
(A) is a plan view and (b) is a front view. Molded body 1B
The rib portions 2 and 3 have a cross-shaped communicating gas channel 4 therein. It also has a gas inlet 5 formed during gas-assisted injection molding.

Using this molded body, holes 6 were drilled at four locations as shown in FIG. The gas inlet 5 is used as the water inlet,
A water supply device 1A of a plant cultivation facility having each hole 6 as a water outlet and a gas channel 4 as a water flow path was provided.

As the plant cultivation equipment, four hydroponic cultivation containers (not shown) are installed. Specifically, each of the hydroponic cultivation containers has a bottom hole that can be connected to each hole 6, and is installed on each hole 6.

As other plant cultivation equipment, ordinary pots (not shown) are used. In this case, for example, four pots of appropriate size may be installed at four corners on the flat plate of the water supply device 1A, and a short water supply pipe connected to each hole 6 may be introduced into the soil of each pot. In this case, a short water supply pipe is required, but the water supply device 1A obtained by the gas assisted injection molding method of the present invention.
By using, it is not necessary to install a water supply pipe from the water supply source to each pot, and the apparatus is simplified as a whole.

[0017]

As described above in detail, by actively using the gas channel of the molded product molded by the gas assisted injection molding method according to the present invention as the fluid flow path, conventionally, the fluid is supplied to the device or the like. It is possible to omit a complicated conductor such as a pipe when performing the process, contribute to simplification, downsizing of the device, cost reduction, and the like, and it can be applied to various uses. Thus, the molded product of the present invention is industrially extremely useful.

[Brief description of drawings]

1 shows a water supply device for a plant cultivation facility obtained in Example 1. FIG.

FIG. 2 shows a molded product by the gas assisted injection molding method used in Example 1.

[Explanation of symbols]

 1A Water supply device for plant cultivation equipment 1B Plate-shaped molded body 2 Vertical rib portion 3 Horizontal rib portion 4 Gas channel 5 Gas injection port 6 Hole used as water outlet

Claims (4)

[Claims] 1. Formed by gas assisted injection molding,
A molded product having a fluid channel therein, characterized in that a molded product having a gas channel therein is further provided with at least one fluid inlet / outlet connected to the gas channel. 2. A molded product having a fluid flow passage therein, wherein the gas channel is formed in a rib portion. 3. A molded product having a fluid flow path according to claim 1, wherein the fluid is a liquid. 4. A water supply device for plant cultivation equipment, comprising a molded body having the fluid flow path according to claim 1 or 2 therein.