JPS591229A - Molding method of packing material - Google Patents

Abstract

PURPOSE:To obtain the packing material of high accuracy and pretty appearance, by providing a first jig contacted to a closed object and a second jig which joins with the first jig and molds the foam object poured inside the space shaped between the closed object and itself. CONSTITUTION:A first jig 11 is fitted inside the duct combining member 8 which constitutes a closed object. A loop like concave part 8a is shaped in the duct combining member 8 at the place where a seal is necessary and the unreacted product 10 of a foamable silicone, soft urethane, etc. is poured in the concave part 8a from a nozzle 12. A space 14 is shaped by joining the first jig 11 and cooperating with the concave part 8a of the duct combining member 8 and the jig 13 which shapes the filled foam object is provided. The foamed packing material 10 is obtained by the foaming, hardening of the fluid silicone or soft urethane.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to parts that require airtightness, such as the exhaust passage of clothes dryers, washing machines, dishwashers, and the like.

Conventional Structure and Problems It has been widely known that a dowel material is placed in locations where watertightness and airtightness are required. As an example, a dryer shown in FIG. 1 will be explained. In the figure, 1 is an outer frame, 2 is a rotary drum disposed rotatably within the outer frame 1, and 3 is a fan that is rotationally driven via a belt 6 by the rotation of a motor 4. The rotating drum 2 is rotated by the rotational force of the motor 4.

Hot air is sucked into the rotating drum 2 by the fan 30, and the clothes in the rotating drum 2 are heated and dried. After being subjected to the drying process, the hot and humid air passes through the rear wall of the rotating drum 2, passes through the fan case 6, reaches the first exhaust guide 7, and then passes through the duct coupling member 8 and the second exhaust duct 9. It is discharged outdoors through the Therefore, there is no risk that the room will become damp, and the room temperature will not rise.

Above 1st. The air passing through the second exhaust duct 7.9 is
Although the relative humidity is approximately 100% higher, the first and second exhaust ducts 7.9 are cooled by the cold outside air. Condensation occurs on the inner wall of the second exhaust duct 7.9. The water droplets generated by this are the first. There is a risk of leakage between the second exhaust duct 7.9 and the duct coupling member 8. Therefore, as illustrated, a backing material 10 is interposed, for example, between the first exhaust duct 7 and the duct coupling member 9.

However, if the backing material 1o is separately molded to simply hold the backing material 1o and the clamping is fixed between the members, the mounting position of the backing material will not be stable, and if the backing material 1o is held in place,
This will involve the troublesome work of setting it up.

OBJECTS OF THE INVENTION It is an object of the present invention to make it possible to avoid handling the backing material alone and to mold it with high precision.

Structure of the Invention The present invention is extremely advantageous in terms of assembly, and can be achieved with high precision by injecting and solidifying a foam into the space between the object to be sealed, such as the duct coupling member shown in the conventional example, and the jig. It is used to form a backing material with good quality.

Description of examples An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows an enlarged view of the sandwiching structure of the backing material 1o for preventing water leakage between the duct coupling member 8 and the first exhaust duct 7 in FIG. The duct coupling member 8 and the first exhaust duct 7 may be formed of any metal material as well as metal materials as long as they have rigidity exceeding a predetermined value and are heat resistant. Considering the ease of molding, it is preferable to use synthetic resin.

Moreover, the duct coupling member 8. It is fully conceivable that the first exhaust duct 7 will have a complicated shape, and accordingly, the backing material 10 will also have to have a complicated shape.

That is, the cross-sectional shape of the backing material 10 cannot necessarily be uniform. Furthermore, when attaching the first exhaust duct 7, it is difficult to tighten the backing material 1o with a uniform force over the entire circumference depending on the rigidity of the first exhaust duct 7.

Therefore, the backing material 10 is silicon.

A soft material such as soft urethane and a foaming material are preferable.

However, in the case of foamed silicone or foamed soft urethane, if the cross-sectional shape differs depending on the location because it is a thin material with a thickness of about 6 mm, it is not possible to use a mold to form the backing material 10. This is technically difficult and expensive.

Therefore, the backing material 1o was molded as follows.

As shown in FIG. 3, the first jig 11 is fitted into the interior of the connecting member 8 constituting the object to be sealed.

A fluid foam, for example, an unreacted product such as foamable silicone or soft urethane, is injected into the shaped portion 8a from the nozzle 12.

Further, in FIG. 4, reference numeral 13 is joined to the first jig 11, cooperates with the concave portion 8a of the duct coupling member 8, forms the space 14 for filling the foam, and fills the filled foam. This is the second jig for molding.

Here, the foam injected into the space 14 generates bubbles during a curing reaction during the solidification process, but the purpose of this is to prevent the duct coupling member 8 from lifting due to the bubbles. A weight 16 is placed on.

The above-described foamable silicone and soft urethane are preferable because they undergo a curing reaction at room temperature and humidity. Furthermore, the above-described foam can be improved in workability by heating to 40 to 80'C.

A soft foamed urethane is obtained by the reaction of the polyhydric alcohol, that is, the carbon dioxide gas generation reaction 2RCNO+2H20-RNHCONHR+C02j, but in this case, the oxidation reaction is promoted by heating and humidification.

On the other hand, urethane foam and soft urethane in a fluid state before curing are composed of two liquids, a base agent and a curing agent, and are easy to use if they start reacting after being mixed and left for about 10 minutes.

In this way, the fluid silicone or soft urethane is foamed and hardened to obtain the foamable backing material 10. As described above, by directly forming the backing material 10 on the duct coupling member 8', which is the object to be sealed, adhesive force is generated between the two, and there is no need to use an adhesive for bonding, and assembly is possible. is easy. In addition, as mentioned above, the first case has a simple structure and a sealed object.
Since the backing material 10 can be formed with the second jigs 11 and 13, if a large number of jigs are prepared, it is possible to easily manufacture the backing material 10 even if the reaction time for - pieces of the backing material 10 takes several hours. .

The tenth jig 11 shown in FIG. 4 is made of rubber, which is an elastic material. As a result, dimensional variations in the molded product of the duct coupling member 8 can be followed by elasticity.

On the other hand, the 20th jig 13 has a rubber member 13 made of an elastic material.
A is used which is integrated with the metal plate 13b by baking molding. In this way, the elasticity of the rubber member 13a can respond to variations in the dimensions of the object to be sealed, and the presence of the metal plate 13b allows the load of the weight 16 to
There is no need to worry about the second jig 13 being deformed as a whole, and since it can be left stacked in several stages, it has the advantage of not taking up a large space during the curing reaction, which takes a long time.

Furthermore, one of the two jigs 11 and 13, for example, the first jig 11, is made of soft rubber with a hardness of about 40 to 60°H8, and the other, for example, the second jig 13, is made of soft rubber with a hardness of about 60 to 80°Ha. By using a combination of different hardnesses such as hard rubber, the joint between the first jig 11 and the second jig 13 can be tightly bonded, so that the backing can be made with good precision and a clean appearance. Material 1o can be molded.

Effects of the Invention As described above, according to the present invention, since the backing material can be formed of a foam, it has good shape conformability to the complicated shape of the object to be sealed, the difference in compressive force during installation, etc., and the water sealing effect is improved. Moreover, since the backing material can be molded directly onto the object to be sealed, it is possible to obtain a backing material that matches the shape of the object to be sealed, and the adhesion of the backing material to the object to be sealed can be obtained. Its industrial value is extremely large, as no work is required.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a clothes dryer, Fig. 2 is a sectional view showing the state in which the backing material is assembled in an embodiment of the present invention, and Fig. 3 is the state in which the foam is injected before the backing material is molded. FIG. 4 is a sectional view showing the state of the backing material during molding. 8...Duct coupling member (sealed body), 1o...
...Backing material, 11, 13...1st.
Second jig, 14...space. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A first jig attached to the object to be sealed, and a second jig that molds the foam injected into the space formed between the first jig and the object to be sealed. A backing material molding device equipped with. (2) The tenth jig is made of rubber and is installed inside the hermetically sealed body, and the second jig is composed of a metal plate and a rubber member integrally fixed on the metal plate, and A molding device for a backing material according to claim 1, which is fitted and fixed to the outside of a sealed body.