KR101007365B1 - Foam forming method using hot airs and its apparatus thereof - Google Patents

Abstract

The present invention relates to a foam molding method and apparatus using hot air, an embodiment of the present invention, after supplying hot air to the inside of the skin cover mounted to the foam mold to preheat to a predetermined temperature or more, the foam liquid inside the skin cover It provides a foam molding method and apparatus using hot air characterized in that the foam molding is performed by injecting.

Hot air, foaming, molding, mold, skin cover, preheating, foaming liquid

Description

Foam molding method and apparatus using hot air {FOAM FORMING METHOD USING HOT AIRS AND ITS APPARATUS THEREOF}

The present invention relates to a foam molding method and apparatus, and more particularly, to a foam molding method and apparatus using hot air to supply hot air to the inside of the skin cover mounted on the foam mold and to inject foamed liquid into the foam. It is about.

In general, polyurethane foam is foamed porous due to carbon dioxide generated during the crosslinking reaction, and has a high mechanical strength, good heat resistance, solvent resistance, aging resistance and adhesion, and by selecting raw material conditions. It is manufactured from a very soft elasticity to a hard wear resistant one.

Particularly, when applied to automobiles, it is used for cushions, fillers, filters, and the like. For example, in case of headrests, a headrest cover, a foam filled inside the headrest cover, and a headrest are used. It consists of a stay for joining to the top of the sheet.

Here, the headrest cover, the manufacturing method of the headrest consisting of the foam and the stay can be largely divided into the epidermal separation manufacturing method and the epidermal body manufacturing method.

Separation method of skin cut type is to assemble the stay into foam mold for foam molding made into a certain shape, and then, urethane foam is injected to mold the foam, and the product is completed by covering the headrest cover on the surface of the molded foam. The integrated manufacturing method is to assemble the stay inside the headrest cover to fix the headrest cover to the molding foam mold, and to form the foam using the injection nozzle.

Among them, the skin separation type manufacturing method is a foam is molded at a relatively high temperature, the molding time is very long, the work efficiency is significantly reduced, and the deformation is generated by forming at a high temperature has a complex disadvantage in the finishing process is mainly used in the integrated skin manufacturing method do.

However, polyurethane is sensitive to temperature during the foaming process, and in particular, due to temperature deviations generated inside the epidermal cover according to weather, season or day and night changes, there is a problem that it is difficult to constantly control the quality of the foam. It is necessary to maintain the temperature inside the epidermal cover at a constant temperature (eg, 60 ° C. to 80 ° C.) regardless of the ambient temperature change before the foam liquid is injected.

The present invention is to solve the problems as described above, one embodiment of the present invention after supplying hot air to the inside of the skin cover mounted to the foam mold preheated to a predetermined temperature or more, injecting the foam liquid inside the skin cover It relates to a foam molding method and apparatus using hot air characterized in that the foam molding is performed.

According to an embodiment of the present invention, after supplying hot air to the inside of the skin cover mounted on the foam mold to preheat to a predetermined temperature or more, hot air, characterized in that the foaming is made by injecting a foam liquid into the skin cover Provided is a foam molding method.

Here, the foam molding method using the hot air, the step of mounting the skin cover to the foam mold, supplying hot air to the interior of the skin cover from the hot air device installed on one side of the foam mold, and the foam liquid inside the skin cover It can be made, including the step of injecting foam.

At this time, the hot air device, the air suction pipe is connected to one side to suck the air from the air suction pipe, the suction fan is connected to the suction fan is installed on one side of the suction fan, and the heater to preheat the sucked air, and installed on one side of the heater It can be configured to include a hot air supply pipe for supplying the preheated air to the inside of the skin cover through the foaming liquid inlet of the foam mold.

The air tank may further include an air tank installed between the heater and the hot air supply pipe so as to store the air preheated by the heater.

In addition, the hot air supply pipe may further include a moving cylinder provided on one side of the hot air supply pipe to be movable in the direction of the inlet of the foam mold.

According to the foam molding method and apparatus using the hot air according to an embodiment of the present invention, the temperature inside the skin cover can be maintained at a constant temperature regardless of the change in the ambient temperature according to the season, weather or day and night changes, The quality of the foam can be managed uniformly, and defects can be prevented.

In addition, since a moving cylinder is provided at one side of the hot air supply pipe, the hot air supply pipe can be moved with respect to the foam injection hole of the foam mold, so that even if a slight deviation occurs between the hot wind supply pipe and the foam injection hole according to the type of foam mold. Can respond.

Hereinafter, a preferred embodiment of the foam molding method and apparatus using hot air according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

In addition, the following examples are not intended to limit the scope of the present invention but merely illustrative of the components set forth in the claims of the present invention, which are included in the technical spirit throughout the specification of the present invention and constitute the claims Embodiments that include a substitutable component as an equivalent in the element may be included in the scope of the present invention.

Example

1 is a flow chart of a foam molding method using a hot air according to an embodiment of the present invention, Figure 2 is a schematic diagram of a foam molding apparatus using a hot air according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention 4 is an exploded perspective view of FIG. 3, and FIG. 5 is a state diagram of a foam molding apparatus using hot air according to an embodiment of the present invention.

In the foam molding method using the hot air according to an embodiment of the present invention, by supplying hot air into the skin cover 20 mounted on the foam mold 10, the inside of the skin cover 20 by a predetermined temperature or more (for example, By preheating to 60 ℃ ~ 80 ℃) and injecting foaming liquid, homogeneous regardless of weather change such as temperature, humidity, seasonal change such as summer and winter, or ambient temperature change due to night and day temperature difference It is characterized in that the product of the foam molding.

As shown in Figure 1, the foam molding method using the hot air according to an embodiment of the present invention, the step of mounting the skin cover 20 to the foam mold 10 (S10), and the skin cover 20 Supplying the hot air into the inside (S20), and injecting a foaming liquid into the interior of the skin cover 20 can be largely divided into (S30). Hereinafter, each step will be described in more detail.

On the other hand, the present embodiment has been described as an example of an automobile headrest (headrest) as a foamed molded product, but is not limited to this may be applied to the production of other foamed molded products, such as armrest (seat) or seat (seat) Reveal in advance.

First, the skin cover 20 is mounted on the foam mold 10 for headrest molding.

Here, the foam mold 10 has a headrest cavity (cavity) 11 in the inside, and one side is provided with a foam liquid inlet 12 connected to the cavity 11, the foam liquid inlet ( 12) is equipped with a foaming funnel 13 for funnel injection, the structure and shape of the foaming mold 10 is already known, so detailed description thereof will be omitted.

At this time, the skin cover 20 is mounted to the cavity 11 of the foam mold 10, the skin cover that is typically applied to the headrest of the vehicle is a fabric material, a bag shape having an opening 21 on one side, The foaming liquid is injected into the epidermal cover 20 through the opening 21, and when the foaming proceeds, the foaming liquid gradually swells and adheres to the outside of the foam, thereby finishing the appearance of the headrest.

After the skin cover 20 is mounted on the foam mold 10, hot air is supplied into the skin cover 20.

In this case, the hot air refers to air heated to a predetermined temperature or more, and the hot air is supplied into the skin cover 20 by the hot air device 100 installed on one side of the foam mold 10. The structure and operation of 100) will be described later in detail.

The interior of the skin cover 20 is preheated to a predetermined temperature or more by hot air, and the foaming liquid is injected through the foam liquid inlet 12 while the interior of the skin cover 20 is preheated.

Therefore, when the foaming liquid is injected, regardless of the temperature change around the foaming mold 10, the inside of the skin cover 20 maintains a predetermined temperature or more, and thus the skin cover due to factors such as weather and seasons in the past ( 20) It is possible to prevent the occurrence of temperature deviation inside to prevent the occurrence of defects, and to control the quality of the foamed molded product constantly.

After the foaming is completed, the foam mold 10 is dismantled, and the foam molding process of the headrest is completed by demolding the foam foam wrapped with the skin cover 20 from the foam mold 10.

According to an embodiment of the present invention, the hot air supplied into the skin cover 20 is supplied from the hot air device 100 installed on one side of the foam mold 10, Figure 2 is a schematic view of such a hot air device 100 Is shown.

As illustrated in FIG. 2, the hot air device 100 according to an embodiment of the present invention includes a suction fan 200 that sucks air from the air suction pipe 150, and a suction fan 200. Heater 300 for heating the sucked air, the air tank 400 to store the air heated by the heater 300, and the hot air (heated air) stored in the air tank 400 foaming mold 10 It comprises a hot air supply pipe 500 to guide the foam liquid injection port 12 of.

Here, a temperature sensor 510 is provided at one side of the hot air supply pipe 500 to sense the temperature of the hot air coming from the air tank 400 and to control the temperature of the heater 300.

In addition, an air filter 151 may be installed at one end of the air suction pipe 150 to prevent the inflow of foreign substances, and the other end of the air suction pipe 150 may be disposed at one side of the suction fan 200. Is connected, the other side of the suction fan 200, the heater connecting pipe 250 is connected to the heater 300 is installed, one side of the heater 300 is connected to the tank tank 350 connected to the air tank 400 It is preferable to install.

3 to 5 illustrate an example of the foam molding apparatus equipped with the hot air device 100 described above.

In general, the foam injection hole 12 of the foam mold 10 is provided on the upper end of the foam mold 10, accordingly, the hot air supply pipe 500 for supplying hot air through the foam injection hole 12 is also a foam mold ( It is preferable to install vertically on top of 10).

Therefore, the support 600 is installed vertically on one side of the foam mold 10, the support plate 610 is installed horizontally apart from the ground on the upper portion of the support 600, the suction fan 200 described above The heater 300 and the air tank 400 are respectively installed on the support plate 610.

The air tank 400 is installed on the support plate 610, and in order to efficiently use the space of the support plate 610, the heater 300 may be installed on the air tank 400, but may be fixed without shaking. It is preferable to fix the bracket 410 on the air tank 400 by welding or the like, and to couple the heater 300 to the upper side of the bracket 410.

At this time, the suction fan 200 is installed side by side with the air tank 400 on one side of the air tank 400, the air suction pipe 150 is connected to one side of the suction fan 200, the end of the air suction pipe 150 The air filter 151 is mounted.

In addition, the suction fan 200 and the heater 300 are connected to each other by the heater connector 250, the heater 300 and the air tank 400 is connected to each other by the tank connector (350).

Therefore, the air sucked into the air suction pipe 150 by the operation of the suction fan 200 is purified while passing through the air filter 151, preheated while passing through the heater 300 is stored in the air tank 400 will be.

At this time, in order to prevent the various devices and wirings from appearing in appearance, and to prevent damage due to the inflow of foreign substances, as shown in FIG. 5, it is preferable to install a cover 700 to surround the surroundings of the aforementioned devices.

The hot air supply pipe 500 connected to the air tank 400 extends in the direction of the foam liquid inlet 12 of the foam mold 10 positioned below the support plate 610, wherein the foam liquid inlet 12 has a foam liquid. The injection funnel 13 is mounted, and the hot air supply pipe 500 is connected to the funnel 13 when the hot air is supplied.

Therefore, during hot air supply, the ends of the hot air supply pipe 500 should be in close contact with the funnel 13 so that hot air does not leak through the gap between the hot air supply pipe 500 and the funnel 13, and then through the funnel 13. When injecting the foam liquid it is necessary to separate the hot air supply pipe 500 from the funnel (13).

To this end, a moving cylinder 621 using hydraulic pressure or pneumatic pressure is installed at one side of the hot air supply pipe 500, and the hot air supply pipe 500 is elevated by the operation of the moving cylinder 621.

At this time, the moving cylinder 621 is preferably installed on one side of the support plate 610, as shown in Figures 3 to 5, the fixing plate 620 is installed vertically on one side of the support plate 610. The moving cylinder 621 may be fixedly installed on the outer surface of the fixing plate 620.

In addition, the hot air supply pipe 500 is connected to the hot air supply pipe 500 and the air tank 400 by the lifting operation of the hot air supply pipe 500, so that the bellows tube 520 having a corrugation is connected to the hot air supply pipe. It is preferable to make it possible to expand and contract according to the elevation of 500.

In addition, if necessary, as shown in FIGS. 3 to 5, the hot air supply pipe 500 from the air tank 400 may be branched to a plurality of hot air supply operations at a time.

On the other hand, as shown in Figure 2 and 4, the hot air device 100 is preferably provided with a circulation line 110 for connecting the air suction pipe 150 and the hot air supply pipe (500).

Both ends of the circulation line 110 are connected to the air suction pipe 150 and the hot air supply pipe 500, respectively, one side of the circulation line 110 is provided with a first valve 111, one side of the hot air supply pipe 500 The second valve 112 is installed.

Therefore, in the initial state, the first valve 111 is opened and the second valve 112 is closed, so that the air roughened from the air suction pipe 150 to the air tank 400 again passes along the circulation line 110. 150, the first valve 111 closes the circulation line 110 and the second valve 112 opens the hot air supply pipe 500 to supply hot air along the hot air supply pipe 500. It will be fluid.

The above-described process may all proceed automatically, and reference numeral 800 denotes a control panel installed on one side of the support 600 to control this automation process.

1 is a flow chart of a foam molding method using hot air according to an embodiment of the present invention.

Figure 2 is a schematic diagram of a foam molding apparatus using hot air according to an embodiment of the present invention.

3 is a perspective view of a hot air device according to an embodiment of the present invention.

4 is an exploded perspective view of FIG. 3.

5 is a state of use of the foam molding apparatus using hot air according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: foam mold 20: skin cover

100: hot air device 110: circulation line

150: air suction pipe 151: air filter

200: suction fan 250: heater connector

300 heater 350 tank connector

400: air tank 500: hot air supply pipe

510: temperature sensor 520: bellows tube

600: support 610: support plate

620: fixed plate 621: moving cylinder

700: cover 800: control panel

Claims (8)

Hot air is supplied to the inside of the skin cover mounted on the foam mold to preheat it to a predetermined temperature or more, and then foaming is injected into the skin cover to foam the molding. Mounting an epidermal cover on the foam mold; Supplying hot air from the hot air device installed at one side of the foam mold to the inside of the skin cover; And Foaming method using hot air comprising a; foaming by injecting a foaming liquid into the interior of the skin cover. The method according to claim 2, wherein the hot air device, An air suction pipe connected to one side, and a suction fan for sucking air from the air suction pipe; A heater connected to the suction fan at one side of the suction fan to preheat the sucked air; And And a hot air supply pipe connected to one side of the heater and supplying preheated air to the inside of the skin cover through the foam liquid injection hole of the foam mold. The method according to claim 3, And an air tank installed between the heater and the hot air supply pipe so as to store the air preheated by the heater. The method according to claim 3, And a moving cylinder provided at one side of the hot air supply pipe to move the hot air supply pipe in a direction of the inlet of the foam mold. The foam cover is mounted to the skin cover and the foam injection hole is provided on one side; A suction fan installed at one side of the foam mold and connected to an air suction pipe; A heater connected to the suction fan at one side of the suction fan to preheat the sucked air; And And a hot air supply pipe connected to one side of the heater and supplying preheated air to the inside of the skin cover through the foam liquid inlet. The method according to claim 6, And an air tank installed between the heater and the hot air supply pipe so as to store the air preheated by the heater. The method according to claim 6, And a moving cylinder provided on one side of the hot air supply pipe so that the hot air supply pipe is movable in the direction of the inlet of the foam mold.

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