JP2000246750A - Method and apparatus for manufacturing skinned synthetic resin in-mold foamed molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently mold a skinned synthetic resin in-mold foamed molded object having no bead pattern-like unevenness on the surface of a thermoplastic resin skin material thereof and good in appearance within a short cycle while accurately performing production control. SOLUTION: A thermoplastic resin skin material 5 is arranged to the mold 3 among two molds 3, 4 constituting a mold 2 and, after the molds are clamped, foamable beads are charged in the mold 2 and heated and foamed by steam to be mutually fused to integrally weld the foamed beads to the thermoplastic resin skin material 5 and the mold 2 is opened after cooling to produce a skinned synthetic resin in-mold foamed molded object 1. In this method, mold opening timing is controlled on the basis of the temp. in the vicinity of the surface 3a of one mold 3 and/or the surface pressure of the skinned synthetic resin in-mold foamed molded object 1 to the surface 4a of the other mold 4. Mold opening is performed after the temp. in the vicinity of the surface 3a of one mold 3 becomes predetermined temp. or lower and the surface pressure of the skinned synthetic resin in-mold foamed molded object 1 becomes predetermined pressure or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a foamed synthetic resin inner foam having a thermoplastic resin skin material fused and integrated to the surface of a synthetic resin foam molded article.

[0002]

2. Description of the Related Art As a conventional method of manufacturing a foamed molded article in a synthetic resin mold with a skin, for example, a thermoplastic resin skin material is arranged in one of two molds constituting a molding die. After the mold is closed, the foamed beads are filled in the mold, and the foamed beads are foamed by steam heating to be fused to each other, and the foamed beads and the thermoplastic resin skin material are fused and integrated to form a synthetic resin. After cooling by water cooling etc. to secure the shape of the in-mold foam molded body, open the mold,
There is known a so-called simultaneous integral molding in which the formed foamed product in the synthetic resin mold with the skin is taken out.

[0003]

However, in the above-mentioned conventional method and the manufacturing apparatus used therefor, since the timing of terminating the cooling and opening the mold is controlled by time, the inside of the synthetic resin mold with a skin is required. It is difficult to control the production of the foamed molded article, and insufficient cooling or overcooling often occurs.

[0004] In the case of insufficient cooling, irregularities in a bead pattern appear on the surface of the thermoplastic resin skin material, and there is a problem that the appearance of the resulting foamed synthetic resin mold with skin is not good.

In the case of supercooling, irregularities in the bead pattern do not appear, but there is a problem that the production efficiency is poor because more time is consumed than the optimum cooling time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to accurately control the production and to provide a skin having a good appearance without irregularities of a bead pattern on the surface of a thermoplastic resin skin material. It is an object of the present invention to provide a method and an apparatus for producing a synthetic resin-in-foam with skin capable of efficiently molding a foam with a synthetic resin in a short cycle.

[0007]

According to the first aspect of the present invention, there is provided a method for producing a foamed molded article in a synthetic resin mold having a skin, wherein the mold is one of two molds constituting a mold. After placing the thermoplastic resin skin material on the mold and closing the mold, the molding beads are filled with foamed beads, and the foamed beads are foamed by steam heating and fused to each other. Materials are fused and integrated,
A method for producing a foamed synthetic resin in-mold having a skin which is opened after cooling, comprising: a temperature near the surface of the one mold; a surface of the one mold and / or a surface of the other mold. The opening timing of the mold is controlled by the surface pressure of the foamed synthetic resin in-mold with the skin.

According to a second aspect of the present invention, there is provided a method for producing a foamed synthetic resin mold in a synthetic resin mold with a skin, wherein the temperature near the surface of the one mold is equal to or lower than a predetermined temperature and the foam in the synthetic resin mold with a skin is formed. This is performed after the surface pressure of the molded body becomes equal to or lower than a predetermined pressure.

According to a third aspect of the present invention, there is provided a method for producing a foamed molded article in a synthetic resin mold with a skin, comprising: placing a thermoplastic resin skin material in one of two molds constituting a molding die; The foamed beads are filled in the mold, and the foamed beads are foamed by steam heating to be fused together, and the foamed beads and the thermoplastic resin skin material are fused and integrated, and the mold is cooled with water and then cooled. A method for producing a foamed molded article in a synthetic resin mold with an open skin, wherein the temperature near the surface of the one mold and the synthesis with the skin with respect to the surface of one mold and / or the surface of the other mold are provided. The timing of the end of the water cooling is controlled by the surface pressure of the resin molded foam.

The method for producing a foamed synthetic resin mold in a skin according to claim 4 is characterized in that the water cooling is performed such that the temperature in the vicinity of the surface of the one mold is lower than a predetermined temperature and the foamed synthetic resin mold in the skin is molded. The process is terminated when the surface pressure of the body becomes equal to or lower than a predetermined pressure, and the mold is opened after allowing to cool for a predetermined time.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a foamed synthetic resin mold in a skin with a skin, wherein the temperature near the surface of the one mold is measured by a temperature sensor provided near the surface of the one mold. The surface pressure of the foamed synthetic resin mold with a skin is measured by a surface pressure sensor provided on the surface of the one mold and / or the surface of the other mold.

According to a sixth aspect of the present invention, there is provided an apparatus for producing a foamed article in a synthetic resin mold with a skin, wherein the thermoplastic resin skin material is disposed in one of two molds constituting the mold. After tightening, the mold is filled with foam beads, and the foam beads are foamed by steam heating and fused together, and the foam beads and the thermoplastic resin skin material are fused and integrated, and cooled. A device for producing a foamed synthetic resin in-mold with a skin which is opened from a mold, wherein a temperature sensor is provided in the vicinity of the surface of the one mold and the surface of one mold and / or the other mold is provided. A surface pressure sensor is provided on the surface.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the method of manufacturing the foamed molded article 1 in a synthetic resin mold with a skin according to this embodiment includes one of the two molds 3 and 4 constituting the mold 2. After the thermoplastic resin skin material 5 is disposed on the mold 3 and the mold is clamped, the foamed beads 7 are filled in the molding die 6, and the foamed beads 7 are foamed by steam heating and fused to each other. And the thermoplastic resin skin material 5 are fused and integrated, and the mold is opened, for example, after cooling with water.

That is, as shown in FIG. 1, first, a thermoplastic resin skin material 5 is arranged on the one mold 3 and the mold is clamped.
The inside of the mold 6 is filled with foam beads 7.

Here, the molding die 2 is composed of, for example, two dies 3 and 4 which can be closed and opened in the horizontal direction. The configuration of the molding die 2 is not limited to this, and may be capable of clamping and opening the mold in a vertical direction or the like.

The one mold 3 has, for example, a concave cross section and a chamber 3b formed therein.
A plurality of decompression holes 3c communicating with the chamber 3b are formed on the side a. The chamber 3b has a steam valve A1, a pressure reducing valve B1, a drain valve C1, and a water cooling valve D.
1 are connected to each other, and a cooling water pipe 8 is connected to the water cooling valve D1. A temperature sensor 9 composed of, for example, a temperature measuring element (thermocouple) is embedded near the surface 3a of the one mold 3 from the side of the chamber 3b. Can be measured. Further, the analog data obtained by the temperature sensor 9 is incorporated into a sequence of a molding machine for controlling the closing and opening of the mold 2 and the start and end of water cooling and the like.

Incidentally, as one of the molds 3,
A breathable electroforming mold such as a nickel electroforming mold (for example, trade name “Porous Denchu”, Gangnam) having fine air holes communicating with the chamber 3b on the entire surface 3a or at an arbitrary position and having air permeability. Or a permeable metal mold or a porcelain ceramic mold (for example, trade name "Pocerax II") in which metal or ceramic particles are sintered under predetermined conditions to form fine ventilation holes on the entire surface 3a. And Shinto Kogyo Co., Ltd.).

The other mold 4 has, for example, a convex cross section and a chamber 4b formed therein.
A plurality of steam holes 4c communicating with the chamber 4b are formed on the side a. The chamber 4b has a steam valve A2, a pressure reducing valve B2, a drain valve C2, a water cooling valve D
2 are connected to each other, and a cooling water pipe 8 is connected to the water cooling valve D2. Also, a feeder 10 for filling the foaming beads 7 into the mold 6 is provided in the chamber 4b.
Also, a surface pressure sensor 11 for measuring the surface pressure of the foamed molded article 1 in the synthetic resin mold with the skin against the surface 4a of the other mold 4 is provided. Further, analog data obtained by the surface pressure sensor 11 is incorporated in a sequence of a molding machine, like the temperature sensor 9.

Examples of the thermoplastic resin skin material 5 include a thermoplastic resin sheet made of a vinyl chloride resin or a polyolefin resin such as a polyethylene resin or a polypropylene resin. Since the thermoplastic resin skin material 5 is used as a skin material of the foamed molded article 1 in a synthetic resin mold with a skin, it may be colored to a desired color with a coloring agent or the like according to the use. .

In order to arrange the thermoplastic resin skin material 5 on the surface 3a of the one mold 3, it is necessary to use another mold in advance so as to conform to the shape of the surface 3a of the one mold 3 by vacuum molding or the like. A molded product may be arranged, or may be arranged by inserting it into the mold 6 and performing vacuum molding, air pressure molding or the like.

Here, when filling the foaming beads 7 from the feeder 10 into the molding die 6, in order to facilitate filling of the foaming beads 7, the mold is slightly opened (cracking) so that the foaming beads 7 do not drop. ) May be filled.

Examples of the synthetic resin constituting the expanded beads 7 include a polyolefin resin and a polystyrene resin.

Examples of the polyolefin resin include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, and ethylene-
Vinyl acetate copolymer, polypropylene homopolymer, ethylene-propylene random copolymer, ethylene-propylene block copolymer, ethylene-propylene-butene random terpolymer, propylene-vinyl chloride copolymer, propylene-butene copolymer Examples include a polymer, a propylene-maleic anhydride copolymer, a polyethylene resin such as poly (butene-1) and a polypropylene resin, and these can be used alone or as a mixture of two or more.

The polyolefin resin is preferably in a non-crosslinked state, but may be crosslinked by peroxide or radiation.

A mixture of the polyolefin resin and another thermoplastic resin can be used. When such a thermoplastic resin is mixed with the above-mentioned polypropylene-based resin, for example, low-density polyethylene, linear low-density polyethylene, vinyl aromatic-based polymer, polybutene, ionomer and the like can be mentioned. When mixed with the polyethylene resin, examples thereof include a vinyl aromatic polymer, polybutene, and an ionomer. In these cases, the blending amount of the thermoplastic resin is preferably 20 parts by weight or less, more preferably 5 to 10 parts by weight, based on 100 parts by weight of the polyolefin resin.

The foamed beads 7 are formed, for example, from the above-described synthetic resin into particles in advance, and in a pressure vessel, the synthetic resin particles are made to contain a volatile foaming agent, and are stirred into water while stirring. After dispersing and heating to a predetermined foaming temperature under pressure, the aqueous dispersion may be manufactured in a prefoamed state by, for example, releasing the aqueous dispersion to a low pressure region. Examples of such foam beads 7 include, for example, Eperan PP (trade name, manufactured by Kaneka Chemical Co., Ltd., expansion ratio 11 to 11).
45 times).

In order to improve the adhesiveness between the synthetic resin in-mold foam molded article 12 formed by in-mold foaming of the foam beads 7 and the thermoplastic resin skin material 5, if necessary, the foam beads 7 may be used. Back surface 5 of thermoplastic resin skin material 5 in contact
An appropriate adhesive may be applied to b in advance. Examples of the adhesive include a synthetic resin solution in an organic solvent, a resin emulsion, a resin powder, and the like.

After filling the foaming beads 7 into the mold 6, as shown in FIG.
The steam valve A2, which is connected to the
c to the inside of the molding die 6, and heat-foam the foam beads 7.

At this time, before the expanded beads 7 are fully heated at a temperature higher than the temperature at which the expanded beads 7 are fused to each other,
If necessary, by preheating these foam beads 7 at a temperature lower than the temperature at which they are fused together, the foam beads 7 can be sufficiently heated without fusing to each other.

Further, if the foamed beads 7 are steamed with steam S while preheating the foamed beads 7 while maintaining the state for a predetermined time, the latent heat of the steam S supplied between the foamed beads 7 can be effectively used. Synthetic resin mold foam molded article 12 with large thickness
For example, there is an advantage that the foamed beads 7 can be more uniformly heated. This steaming may be performed while the supply of steam S is continued, or
May be stopped and the drain valve C2 may be opened if necessary. After steaming with steam S, there is a drain (moisture) between the foam beads 7, and if the main heating is performed in that state, fusion defects between the foam beads 7 may occur. It is desirable to remove the drain by a method such as evacuation of the mold 6 or ventilation of high-temperature dry air from the steam hole 4c in a state where the mold is slightly opened (cracked).

Next, main heating is performed at a temperature not lower than the temperature at which the foam beads 7 are fused to each other. This main heating is performed by opening the steam valve A2 and supplying the steam S from the steam hole 4c to the inside of the mold 6. At this time, if the inside of the mold 6 has been evacuated to remove the drain after steaming with steam S as described above, the steam S for the main heating is more smoothly introduced into the mold. 6 can be supplied. In addition, at the time of the main heating, it is desirable that the state is maintained for a predetermined time in order to sufficiently transmit the heat of the steam S to the foam beads 7.

Thereafter, as shown in FIG. 3, for example, water cooling is performed to secure the shape of the synthetic resin mold foam molded body 12 softened by steam heating. The water cooling is performed by, for example, opening the water cooling valves D1 and D2 and discharging the cooling water 13 from the cooling water pipe 8. In this case, in order to improve the releasability of the foamed molded article 1 in the synthetic resin mold with a skin, drainage, cooling, re-water cooling, release pressurization and the like are required as needed after the completion of water cooling and before the mold is opened. May be performed. In addition, as a cooling method, in addition to water cooling as in this embodiment, for example, standing cooling, vacuum cooling, or the like can be used.

At this time, the one mold 3 is cooled by discharging water in the chamber 3b of the one mold 3, and the thermoplastic resin skin material 5 side of the synthetic resin molded foam 1 with a skin is cooled. You. In addition, the other mold 4 is cooled by discharging water in the chamber 4b of the other mold 4 and the synthetic resin mold foam molded body 12 is cooled, and the synthetic resin mold foam molded article 12 is cured. To secure the shape.

Here, by controlling the sequence of the molding machine,
Water cooling is stopped after the temperature in the vicinity of the surface 3a of one mold 3 is equal to or lower than a predetermined temperature and the surface pressure of the foamed synthetic resin mold 1 with a skin on the surface 4a of the other mold 4 is equal to or lower than a predetermined pressure. When the mold is opened and the foamed synthetic resin in-mold 1 with skin is taken out and unnecessary ears 5c are cut or the like, the foamed synthetic resin in-mold formed by foaming the foam beads 7 shown in FIG. Body 12 and the foamed molded body 12 in the synthetic resin mold
Thermoplastic resin skin material 5 fused and integrated to surface 12a of
Thus, a foamed molded article 1a with a skin in the synthetic resin mold is obtained.

The optimum range of the temperature near the surface 3a of the one mold 3 and the surface pressure of the foamed synthetic resin mold 1 with the skin when opening the mold is determined by the material of the thermoplastic resin skin material 5, It can be appropriately changed according to the material of the beads 7, the expansion ratio, the shape of the foamed molded article 1 in the synthetic resin mold with the skin, etc., and is set as a range where the irregularities of the bead pattern do not appear on the surface 5a of the thermoplastic resin skin material 5. I just need. For example, a polyolefin-based thermoplastic resin sheet (TPO sheet) is used as the thermoplastic resin skin material 5, and Eperan PP (manufactured by Kaneka Chemical Co., Ltd., trade name, expansion ratio 15) is used as the expanded beads 7.
), The optimal ranges are 90
C. and 0.8 kg / cm ² or less, preferably 80 ° C. or less and 0.6 kg / cm ² or less, more preferably 60 ° C. or less and 0.4 kg / cm ² or less.

Further, in this embodiment, the surface pressure sensor 11 is provided on the surface 4a of the other mold 4, but the present invention is not limited to this. May be provided so as not to be damaged, or provided on the surfaces 3a and 4a of both the dies 3 and 4, respectively. Further, two or more surface pressure sensors 11 may be provided on the surface 3a of the one mold 3 or the surface 4a of the other mold 4, and the temperature sensor 9 may be provided on the surface 3a of the one mold 3.
It may be provided in more than one place. When the temperature sensor 9 and the surface pressure sensor 11 are provided at a plurality of locations, the average value, the maximum value, and the minimum value at the plurality of locations are determined according to the shape and material of the foamed molded article 1 in the synthetic resin mold with the skin. An appropriate value may be selected from among these. The configurations of the temperature sensor 9 and the surface pressure sensor 11 are not particularly limited, and various types of conventionally known ones can be used.

Further, in this embodiment, the case where one of the molds 3 is a concave mold (female mold) having a concave cross section has been described, but the present invention is not limited to this.
Convex type (male type) in which one mold 3 is formed to have a convex cross section
In addition, the other mold 4 may be a concave mold (female mold) formed in a concave cross section.

As described above, the temperature in the vicinity of the surface 3a of the one mold 3 and the foamed molded article in the synthetic resin mold with the skin for at least one of the surface 3a of the one mold 3 and the surface 4a of the other mold 4. Since the timing of opening the mold is controlled by the surface pressure of 1, the production of the foamed molded article 1 in the synthetic resin mold with a skin can be managed more accurately than in the conventional control by time, and insufficient cooling or supercooling is performed. There is an advantage that no occurrence occurs.

In this case, if the mold is opened after reaching the above-mentioned optimum range, the skin is sufficiently cooled, so that the surface 5a of the thermoplastic resin skin material 5 has a good appearance with no irregularities of the bead pattern. There is an advantage that the synthetic resin mold inner foam 1 can be manufactured. Further, if the mold is opened immediately after reaching the above-mentioned optimum range, there is an advantage that supercooling does not occur, and the foamed molded article 1 with a skin can be efficiently produced in a short cycle.

Here, in the case of opening the mold after cooling with water as in this embodiment, similarly, when controlling the timing of terminating the water cooling by the temperature in the vicinity of the surface 3a and the surface pressure, it is more accurate. There is an advantage that management is possible.

In this case, when the temperature in the vicinity of the surface 3a is equal to or lower than a predetermined temperature and the surface pressure is equal to or lower than the predetermined pressure, the water cooling is terminated, and the mold is opened after allowing to cool for a predetermined time.
Since the temperature distribution can be made uniform, there is an advantage that dimensional stability and surface properties are improved. In this case, the mold opening also
What is necessary is just to perform after reaching the above-mentioned optimal range.

The temperature near the surface 3a is measured by a temperature sensor 9 provided on one mold 3, and the surface pressure is measured on the surface 3a of one mold 3 and the surface 4 of the other mold 4.
If the measurement is performed by the surface pressure sensor 11 provided in at least one of the cases a, there is an advantage that the timing of opening the mold and terminating the water cooling can be more accurately controlled.

[0043]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 One of the two molds constituting the molding die was a female mold, and the other mold was a male mold. For the one mold, a porous sintered metal was used to secure air vents, and its surface was preliminarily provided with a grain pattern by chemical etching. Further, a temperature sensor for measuring the temperature near the mold surface was embedded near the surface of one mold. The other mold has a steam hole for supplying water vapor into the molding die, and further has a feeder for filling foam beads, and a synthetic resin mold with a skin on the surface of the other mold. A surface pressure sensor for measuring the surface pressure (foam surface pressure) of the foam molded article is also provided. The analog data from the temperature sensor and the surface pressure sensor is incorporated into the sequence of the molding machine, and the closing and opening of the mold, the start and end of water cooling, etc. are automatically controlled. .

As a thermoplastic resin skin material, a polyolefin-based thermoplastic resin sheet (TPO sheet) was used, and this thermoplastic resin sheet which had been heated and softened in advance was disposed in the one mold. Next, the inside of the chamber of the one mold was evacuated to bring the thermoplastic resin sheet into close contact with the one mold, followed by molding.

As the expanded beads, Eperan PP (manufactured by Kaneka Chemical Co., Ltd., trade name, expansion ratio 15 times, with an internal pressure of 2 atm previously applied by air pressure in a pressure-resistant container) was used, and after closing the mold, The beads were filled into the mold through the feeder.

Next, steam (steam pressure: 1.0 kg / cm ² · G) was supplied from a steam hole formed in the other mold into the mold, and preliminarily heated to steam the foam beads. rear,
The drain and water vapor were sucked and removed using a vacuum pump. After that, the steam (vapor pressure of 3.5 to
4.0 kg / cm ² · G) was supplied into the mold, and the main heating was performed.

Next, cooling water was discharged in the chambers of both molds to perform water cooling. Water cooling was stopped when the temperature near the surface of the one mold was 85 ° C. or less, and the surface pressure of the foamed molded article in the synthetic resin mold with the skin became 0.5 kg / cm ² or less, and the mold was opened. A foamed synthetic resin mold with a skin was obtained.

Example 2, Example 3, Comparative Examples 1 to 3 Using foam beads having an internal pressure different from that of Example 1,
Except for changing the value of the temperature near the mold surface and the value of the surface pressure (foam surface pressure) for controlling the timing of opening the mold, a foamed synthetic resin mold with a skin was produced in the same manner as in Example 1. Obtained.

The surface properties of the foamed synthetic resin molds with skin obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were observed and evaluated based on the following criteria. Table 1 shows the results. [Evaluation Criteria] A: No bead pattern appeared on the surface of the thermoplastic resin skin material. ×: A bead pattern appeared on the surface of the thermoplastic resin skin material.

[0051]

[Table 1]

[0052]

As described above, according to the first aspect of the present invention, the temperature near the surface of the one mold and the surface of the surface of the one mold and / or the surface of the other mold are provided. Since the timing of opening the mold is controlled by the surface pressure of the molded article in the synthetic resin mold, the production of the molded article in the synthetic resin mold with skin can be managed more accurately than in the conventional control by time, and cooling can be performed. There is an advantage that shortage and supercooling do not occur.

According to the second aspect of the present invention, since the mold opening is performed after reaching the optimum range, the foamed synthetic resin mold with skin is sufficiently cooled. Therefore, there is an advantage that it is possible to produce a foamed synthetic resin-type inner foam having a good appearance in which the surface of the thermoplastic resin skin material has no irregularities in a bead pattern. Further, if the mold is opened immediately after reaching the above-mentioned optimum range, there is an advantage that super-cooling does not occur and a foamed molded article with a skin can be efficiently produced in a short cycle.

According to the third aspect of the present invention, the temperature in the vicinity of the surface of the one mold and the foamed molded article with the skin with respect to the surface of the one mold and / or the surface of the other mold. Since the timing of the end of the water cooling is controlled by the surface pressure of the first embodiment, there is an advantage that more accurate management is possible as in the case of the first aspect.

According to the fourth aspect of the present invention, the water cooling is performed such that the temperature in the vicinity of the surface of the one mold is equal to or lower than a predetermined temperature and the surface pressure of the foamed molded article in the synthetic resin mold with the skin is equal to or lower than a predetermined pressure. Since the mold opening is performed after the cooling is completed for a predetermined time and the mold is opened, there is an advantage that the temperature distribution can be made uniform, thereby improving the dimensional stability and the surface properties.

According to the fifth aspect of the present invention, the temperature near the surface of the one mold is measured by a temperature sensor provided near the surface of the one mold, and the inside of the synthetic resin mold with the skin is molded. Surface pressure of the one mold and / or
Alternatively, since the measurement is performed by the surface pressure sensor provided on the surface of the other mold, there is an advantage that the timing of the mold opening and the end of the water cooling can be more accurately controlled.

According to the invention of claim 6, a temperature sensor is provided near the surface of the one mold and a surface pressure sensor is provided on the surface of the one mold and / or the surface of the other mold. Because of this manufacturing apparatus, which can more accurately control the timing of the mold opening and the end of water cooling, the synthetic resin mold with a skin having a good appearance without irregularities of the bead pattern on the surface of the thermoplastic resin skin material can be shortened. There is an advantage that it can be efficiently manufactured in a cycle.

[Brief description of the drawings]

FIG. 1 shows a method for producing a foamed synthetic resin in-mold with a skin according to an embodiment, in which a thermoplastic resin skin material is arranged on the surface of one of the molds, the mold is clamped, and then the foamed beads are filled in the mold. FIG.

FIG. 2 is a schematic sectional view showing a state in which the foam beads of FIG. 1 are foamed in a mold.

FIG. 3 is a schematic sectional view showing a state of water cooling.

FIG. 4 is a cross-sectional view of a foamed synthetic resin-in-mold having a skin after removing ears.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Foam molded article in synthetic resin mold with skin 2 Mold 3 One mold 3a Surface 4 The other mold 4a Surface 5 Thermoplastic resin skin material 6 Mold 7 Foam beads 9 Temperature sensor 11 Surface pressure sensor

Claims (6)

[Claims] Claims: 1. A thermoplastic resin skin material is placed in one of two molds constituting a molding die, and after clamping,
Filling the molding beads with foam beads, foaming these foam beads by steam heating and fusing them together,
A method for producing a foamed molded article in a synthetic resin mold with a skin in which these foamed beads and the thermoplastic resin skin material are fused and integrated, and the mold is opened after cooling. Controlling the timing of opening the mold by controlling the surface pressure of the foamed molded article in the synthetic resin mold with the skin against the surface of the one mold and / or the surface of the other mold. A method for producing a resin molded in-mold foam. 2. The method according to claim 1, wherein the mold opening is performed after the temperature in the vicinity of the surface of the one mold is equal to or lower than a predetermined temperature and the surface pressure of the foamed synthetic resin mold with the skin is equal to or lower than a predetermined pressure. The method for producing a foamed synthetic resin molded article with a skin according to claim 1. 3. A thermoplastic resin skin material is placed on one of two molds constituting a molding die, and the mold is clamped.
Filling the molding beads with foam beads, foaming these foam beads by steam heating and fusing them together,
A method for producing a foamed synthetic resin-in-mold molded article with a skin in which these foam beads and the thermoplastic resin skin material are fused and integrated, and the mold is opened after cooling with water. Controlling the end of the water-cooling by controlling the surface pressure of the foamed molded article in the synthetic resin mold with the skin against the surface of the one mold and / or the surface of the other mold. A method for producing a resin molded in-mold foam. 4. The water cooling is terminated when the temperature in the vicinity of the surface of the one mold becomes a predetermined temperature or less and the surface pressure of the foamed molded article in the synthetic resin mold with the skin becomes a predetermined pressure or less, The method according to claim 3, wherein the mold is opened after being left to cool for a predetermined time. 5. The temperature near the surface of the one mold is measured by a temperature sensor provided near the surface of the one mold, and the surface pressure of the foamed synthetic resin mold inside the skin is measured with the one mold. The method for producing a foamed synthetic resin molded article with a skin according to any one of claims 1 to 4, wherein the measurement is performed by a surface pressure sensor provided on a surface of a mold and / or a surface of the other mold. . 6. A thermoplastic resin skin material is placed on one of two molds constituting a molding die and the mold is clamped.
Filling the molding beads with foam beads, foaming these foam beads by steam heating and fusing them together,
An apparatus for manufacturing a foamed synthetic resin-in-mold with a skin in which these foam beads and the thermoplastic resin skin material are fused and integrated, and the mold is opened after cooling. An apparatus for producing a foamed molded article in a synthetic resin mold with a skin, comprising a sensor and a surface pressure sensor provided on the surface of one of the molds and / or the surface of the other mold.