JP2020116798A - Method and apparatus for molding foam resin molded product - Google Patents

Abstract

To provide a method and an apparatus for molding a foam resin molded product which can obtain air bubbles having a uniform size in the whole of a foamable resin 11 when a predetermined member (skin material 62) is partially set to a molding surface 3a of a fixed die 3 or a molding surface 4a of a movable die 4.SOLUTION: After a cavity 5 is filled and before retraction of a movable die 4 is started, at least one of heating a foamable resin 11 in a first corresponding part 5a corresponding to a side on which a predetermined member is not set in the cavity 5, and cooling the foamable resin 11 in a second corresponding part 5a corresponding to a side on which the predetermined member is set in the cavity 5 is executed.SELECTED DRAWING: Figure 4

Description

The present invention belongs to a technical field relating to a molding method and a molding apparatus for a foamed resin molded product in which a predetermined member is integrally provided on a part of the front side surface or the back side surface.

BACKGROUND ART Conventionally, a molding method and a molding apparatus for a foamed resin molded product in which a predetermined member (core material, skin material, etc.) is integrally provided on the front surface or the back surface are well known. For example, in Patent Documents 1 and 2, when a mold is opened, a core material and a skin material are set in the mold, and the mold is clamped to form between the fixed mold and the movable mold. It is disclosed that the cavity is filled with a molten expandable resin. Further, Patent Document 1 discloses that after the filling of the foamable resin into the cavity is completed, the movable mold is retracted in the mold opening direction of the molding die (so-called core back) to foam the foamable resin. Has been done.

JP, 2010-082842, A JP, 2008-173896, A

By the way, the said predetermined member may be provided in a part of front surface or back surface of a foamed resin molded product. In this case, when the mold is opened, the predetermined member is partially set on the molding surface of the fixed mold or the movable mold of the mold. Then, in the first corresponding portion corresponding to the side where the predetermined member is not set in the cavity and the second corresponding portion corresponding to the side where the predetermined member is set, the molten foamable resin is filled substantially at the same time. After the completion of the filling and the completion of the filling, the movable mold is retracted in the mold opening direction of the mold to foam the foamable resin.

However, when the predetermined member is partially set on the molding surface of the fixed mold or the movable mold as described above, in the first corresponding portion and the second corresponding portion of the cavity, the filled foaming property is usually set. There is a problem that the cooling rate of the resin is different. That is, the predetermined member prevents the heat of the foamable resin filled in the cavity from being transferred to the fixed mold or the movable mold, and the second corresponding portion of the cavity is different from the first corresponding portion. As a result, the cooling rate of the foamable resin becomes slow.

Therefore, when retreating (core back) of the movable die is started at a certain timing after the completion of the filling of the foamable resin into the entire cavity, at the time of starting the retreat (that is, at the start of foaming), the first corresponding portion And the second corresponding portion have different temperatures of the foamable resin, and as a result, the first corresponding portion and the second corresponding portion have different foaming properties of the foamable resin, and the foamable resin after foaming has The size of the bubbles is different.

The present invention has been made in view of such a point, and an object thereof is to provide a uniform foamable resin as a whole when a predetermined member is partially set on a molding surface of a fixed mold or a movable mold. It is an object of the present invention to provide a molding method and a molding device for a foamed resin molded product, which can obtain bubbles of various sizes.

In order to achieve the above object, in a first aspect of the present invention, a fixed mold and a movable mold are targeted for a molding method of a foamed resin molded product in which a predetermined member is integrally provided on a part of the front side surface or the back side surface. In the molding die having a mold, a setting step of partially setting the predetermined member on the molding surface of the fixed mold or the movable mold, and after the setting step is completed, the fixed mold and the fixed mold are formed by clamping the molding die. A filling step of filling a molten foamable resin into a cavity formed between the movable mold and the foamable resin by retracting the movable mold in the mold opening direction of the molding die after completion of the filling step. And a foaming step of foaming, wherein the filling step corresponds to a first corresponding portion of the cavity in which the predetermined member is not set and a side of the cavity in which the predetermined member is set. The second corresponding portion is a step of completing the filling of the foamable resin substantially at the same time, and after the start of the filling step and before the start of the foaming step, the foamable resin in the first corresponding portion of the cavity. And a resin temperature adjusting step of performing at least one of cooling the foamable resin in the second corresponding portion of the cavity.

Whether the temperature of the foamable resin in the second corresponding portion of the cavity can be brought close to the temperature of the foamable resin in the first corresponding portion at the start of retreat of the movable die (at the start of foaming) by the above molding method, Alternatively, they can be approximately the same. As a result, the foamability of the foamable resin becomes substantially the same in the first corresponding portion and the second corresponding portion, and the sizes of the bubbles of the foamable resin after foaming can be made uniform. The predetermined member may be a member that prevents the heat of the foamable resin filled in the cavity from being transferred to the fixed mold or the movable mold.

In the method for molding a foamed resin molded article, the retraction of the movable mold in the foaming step is performed by the temperature of the foamable resin in the first corresponding portion of the cavity and the foamability in the second corresponding portion of the cavity. It is preferred to start when the temperature of the resin is about the same.

As a result, bubbles of uniform size can be obtained more reliably in the entire foamable resin.

In one embodiment of the method for molding the foamed resin molded product, the predetermined member is a skin material provided on the front side surface of the foamed resin molded product.

This can improve the appearance of the foamed resin molded product and the feel when a person touches a predetermined member (skin material).

In an example in which the predetermined member is a skin material, the skin material has a skin layer and a cushion layer provided on the back side surface of the skin layer.

As a result, the foamed resin molded product can be arranged at a place where a person can touch it, and the feeling when a person touches the predetermined member (skin material) can be further improved.

Further, in another example in which the predetermined member is a skin material, the foamed resin molded article is an interior material for a vehicle.

As a result, a foamed resin molded product suitable for use as an interior material that is required to have an appearance in a vehicle or an interior material that is likely to be touched by a vehicle occupant can be obtained.

In a second aspect of the present invention, a fixed mold and a movable mold are provided for a molding device of a foamed resin molded product in which a predetermined member is integrally provided on a part of the front side surface or the back side surface. A molding die capable of partially setting the predetermined member on the molding surface of the movable die, and the movable die is moved so as to approach and separate from the fixed die to clamp and open the molding die. A movable die driving means for performing, and a portion formed between the fixed die and the movable die when the predetermined member is partially set on the molding surface of the movable die and the die is clamped. The cavity is provided with a filling means for filling a molten foamable resin, and the movable mold driving means is configured to move the movable mold to a mold of the molding die after the filling means completes the filling of the cavity with the foamable resin. The filling means is configured to retreat in the opening direction to foam the expandable resin, and the filling means includes a first corresponding portion corresponding to a side of the cavity on which the predetermined member is not set, and the predetermined member in the cavity. Is configured to complete the filling of the foamable resin at substantially the same time in the second corresponding portion corresponding to the side on which is set, and after the start of filling the cavity by the filling unit and by the movable mold driving unit. At least heating the foamable resin in the first corresponding portion of the cavity and cooling the foamable resin in the second corresponding portion of the cavity before starting the retreat of the movable mold; It further comprises a resin temperature adjusting means for performing one.

With this configuration, as in the molding method of the foamed resin molded product, bubbles having a uniform size can be obtained in the entire foamable resin.

As described above, according to the molding method and molding apparatus for a foamed resin molded product of the present invention, when the predetermined member is partially set on the molding surface of the fixed mold or the movable mold, the entire foamable resin is uniform. Bubbles of a size can be obtained.

It is a side view (partial sectional view) which shows the outline of the shaping|molding apparatus of the foaming resin molded product which concerns on embodiment of this invention. It is sectional drawing which simplifies and shows a foaming resin molded product. It is sectional drawing of a shaping|molding die, a fixed platen, and a movable platen which show the state which the mold clamping was completed in the state which the skin material was set to the shaping|molding surface of a movable mold. FIG. 4 is a view corresponding to FIG. 3 showing a state where molten foamable resin is being supplied to the first corresponding portion and the second corresponding portion of the cavity. FIG. 4 is a view corresponding to FIG. 3 showing a state in which the movable die has completely retracted in the mold opening direction of the forming die.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 schematically shows a molding device 1 for a foamed resin molded product according to an embodiment of the present invention. The molding apparatus 1 includes a molding die 2 having a fixed die 3 and a movable die 4, a molding die opening/closing device 21 for clamping and opening the molding die 2, and a fixed die 3 by clamping the molding die 2. The cavity 5 formed between the movable die 4 and the movable die 4 is provided with an injection device 31 for injecting and filling the molten foaming resin 11 (see FIGS. 4 and 5). The surface of the fixed mold 3 that contacts the cavity 5 is the molding surface 3a of the fixed mold 3, and the surface of the movable mold 4 that contacts the cavity 5 is the molding surface 4a of the movable mold 4.

The injection device 31 has a heating cylinder 32 connected to a fixed die 3 of the molding die 2 and a hot runner 6 provided on a fixed platen 22 described later, and a hopper 33 is connected to the heating cylinder 32. .. In the case of chemical foaming, a pellet of a foaming resin material (for example, polypropylene) and a chemical foaming agent are charged into the hopper 33, and in the case of physical foaming, only the pellet is charged. In the case of physical foaming, gas (nitrogen, carbon dioxide, etc.) is injected from the gas injection part 34 connected to the heating cylinder 32. The pellets charged into the hopper 33 are supplied into the heating cylinder 32, and are melted in the heating cylinder 32 by a heater (not shown). The chemical foaming agent generates foaming gas by thermal decomposition in the heating cylinder 32.

In the heating cylinder 32, a screw (not shown) is provided rotatably around the axis of the heating cylinder 32 and movable in the axial direction (horizontal direction) of the heating cylinder 32. The screw drive device 37 has an end portion (rear end portion) on the opposite side of the molding die 2 in the screw, which has a rotating mechanism (including a motor) for rotating the screw and a moving mechanism (including a motor) for moving the screw. Is linked to. Then, the screw is moved by the moving mechanism to the molding die 2 side (moves forward) while being rotated by the rotating mechanism of the screw driving device 37, whereby the foamable resin 11 melted in the heating cylinder 32 passes through the hot runner 6. Is injected and supplied into the cavity 5.

The hot runner 6 has a common part 6a connected to the heating cylinder 32, and a first branch part 6b and a second branch part 6c branched from the common part 6a and connected to the cavity 5, respectively. A first valve gate 8 and a second valve gate 9 for opening and closing the opening are provided at the opening to the cavity 5 in the first branch portion 6b and the second branch portion 6c, respectively.

The molding die opening/closing device 21 includes a fixed platen 22 to which the fixed die 3 is attached, a movable platen 23 to which the movable die 4 is attached, and a movable die drive device 26 connected to the movable platen 23. In the present embodiment, although not shown in detail, the movable die drive device 26 has a hydraulic cylinder, and the movable platen 23 and the movable die 4 are fixed to the fixed die 3 by supplying and discharging hydraulic pressure to and from the hydraulic cylinder. Move to and away from.

The movable platen 23 is provided with a plurality of tubular members 24 that extend horizontally toward the fixed platen 22, and the fixed platen 22 includes a plurality of tubular members 24 that extend horizontally toward the movable platen 23 within the plurality of tubular members 24. Shaft member 25 is provided. Each shaft member 25 is provided with a sliding portion 25a having an outer diameter substantially the same as the inner diameter of each tubular member 24. When the movable platen 23 and the movable die 4 are moved, the sliding portion of each shaft member 25 is provided. The movable platen 23 and the movable die 4 are guided so as to move in the horizontal direction by the sliding of 25a in each tubular member 24. In this way, the movable die driving device 26 moves the movable die 4 so as to move closer to and away from the fixed die 3 to perform clamping and opening of the molding die 2. In addition, the movable mold driving device 26 retracts the movable mold 4 in the mold opening direction of the molding mold 2 from the mold clamped state of the molding mold 2 in order to foam the foamable resin 11 filled in the cavity 5. It also has a role.

In the present embodiment, a plurality of fixed-side heating water channels 41 are provided near the molding surface 3a of the fixed mold 3 so as to extend along the molding surface 3a. These fixed side heating water passages 41 are heated via a fixed side heating water supply passage (not shown) provided in the fixed die 3 and the fixed platen 22 and a fixed side heating water supply pipe 42 provided with a control valve 43. It is connected to the device 44. When the control valve 43 is opened, the heated water heated by the heating device 44 is supplied to the fixed-side heated water passage 41 via the fixed-side heated water supply pipe 42 and the fixed-side heated water supply passage. The heated water supplied to the fixed-side heated water passage 41 is returned to the heating device 44 via a fixed-side heated water return passage and a fixed-side heated water return pipe (not shown).

In addition, a plurality of movable-side heating water passages 46 are provided so as to extend along the molding surface 4a in the vicinity of a portion of the molding surface 4a of the movable mold 4 to which a skin material 62 described later is not set. These movable side heating water passages 46 are heating devices via fixed side heating water supply passages (not shown) provided in the movable die 4 and the movable platen 23 and movable side heating water supply pipes 47 provided with a control valve 48. Connected to 44. When the control valve 48 is opened, the heated water heated by the heating device 44 is supplied to the movable heating water passage 46 via the movable heating water supply pipe 47 and the fixed heating water supply passage. The heated water supplied to the movable side heated water passage 46 is returned to the heating device 44 via a movable side heated water return passage and a movable side heated water return pipe (not shown).

On the other hand, a plurality of cooling water passages 51 are provided near the portion of the molding surface 4a of the movable mold 4 where the skin material 62 described later is set so as to extend along the molding surface 4a. These cooling water passages 51 are connected to a cooling device 54 via a cooling water supply passage (not shown) provided in the movable die 4 and the movable platen 23 and a cooling water supply pipe 52 provided with a control valve 53. There is. When the control valve 53 is opened, the cooling water cooled by the cooling device 54 is supplied to the cooling water passage 51 via the cooling water supply pipe 52 and the cooling water supply passage. The cooling water supplied to the cooling water passage 51 is returned to the cooling device 54 via a cooling water return passage and a cooling water return pipe (not shown).

The control valves 43, 48, 53 are opened after starting the filling of the foamable resin 11 into the cavity 5 and before starting the retreat of the movable mold 4. In the present embodiment, the control valves 43, 48, 53 are opened during the period from the completion of the filling of the foamable resin 11 into the cavity 5 to the start of the retreat of the movable mold 4. However, the present invention is not limited to this, and the control valves 43, 48, 53 may be opened from the start of the filling of the foamable resin 11 into the cavity 5 or from the middle of the filling to the start of the retreat of the movable mold 4. .. Further, the control valves 43, 48, 53 may be opened in different periods.

A hydraulic cylinder in the movable drive device 26 (specifically, a valve for supplying/discharging hydraulic pressure to/from the hydraulic cylinder), motors of a rotating mechanism and a moving mechanism in the screw drive device 37, first and second valve gates 8 and 9, In addition, the operation of the control valves 43, 48, 53 is controlled by the control unit 50. The control unit 50 is a well-known microcomputer-based controller that executes a computer program (including a basic control program such as an OS and an application program that is activated on the OS to realize a specific function). It includes a central processing unit (CPU), a memory configured by, for example, a RAM or ROM to store programs and data, and an input/output (I/O) bus for inputting/outputting various signals.

In the present embodiment, the movable driving device 26 constitutes a movable driving means, and includes the injection device 31, the hot runner 6 (the common portion 6a, the first branch portion 6b and the second branch portion 6c), the first valve gate 8 And the second valve gate 9 constitutes a filling means. Further, the fixed side heating water passage 41, the movable side heating water passage 46, the cooling water passage 51, the fixed side and movable side heating water supply pipes 42 and 47, the cooling water supply pipe 52, the control valves 43, 48 and 53, the heating device 44 and the cooling. The device 54 constitutes a resin temperature adjusting means.

In the present embodiment, the foamed resin molded product molded by the molding apparatus 1 (molding die 2) is integrally formed with a skin material 62 as a predetermined member on a part of the front side surface as shown in a simplified manner in FIG. The foamed resin molded product 60 provided in the. That is, the foamed resin molded product 60 has a main body 61 in which the foamable resin 11 filled in the cavity 5 is solidified, and a skin material 62 integrally provided on a part of the front side surface of the main body 61. .. As will be described later, the skin material 62 is partially set on the molding surface 4a of the movable mold 4 when molding the foamed resin molded product 60, and corresponds to the side of the cavity 5 on which the skin material 62 is set. It prevents the heat of the foamable resin 11 in the portion (the second corresponding portion 5b described later) from being transferred to the movable mold 4.

In the present embodiment, the skin material 62 is a contractible member having a skin layer 62a and a cushion layer 62b provided on the back side surface of the skin layer 62a. The skin layer 62a is made of, for example, vinyl chloride resin, and the cushion layer 62b is made of, for example, a polyolefin foam (Pef) formed by electron beam crosslinking. The skin material 62 does not have to be a contractible member (the cushion layer 62b may not be included).

The foamed resin molded product 60 is used, for example, as an interior material for a vehicle. Specific examples of interior materials for vehicles include trims (door trims, etc.), center consoles, trunk boards, and the like. A skin material is provided on the front surface of each of the interior materials, particularly at a place where the occupant is likely to touch it.

Next, a molding method of the foamed resin molded product 60 shown in FIG. 2 will be described with reference to FIGS.

First, an operator partially sets the skin material 62 on the molding surface 4 a of the movable mold 4 in the mold open state of the molding die 2. The molding surface 4a on which the skin material 62 is set is provided with a plurality of support members (not shown) such as pins that pierce the skin material 62, and the skin material 62 is supported on the molding surface 4a by the plurality of support members. Be set.

After that, when the operator operates the switch, the operation information is input to the control unit 50, and based on a command from the control unit 50 to which the operation information is input, the mold is clamped to the next mold opening. Up to this point, a series of operations for molding the foamed resin molded product 60 is performed.

Specifically, the movable mold driving device 26 of the mold opening/closing device 21 moves the movable mold 4 on which the skin material 62 is set toward the fixed mold 3 to clamp the molding mold 2.

As shown in FIG. 3, in the mold clamping completed state of the molding die 2, the cavity 5 has the first corresponding portion 5a corresponding to the side on which the skin material 62 is not set and the side on which the skin material 62 is set. It is divided into a corresponding second corresponding portion 5b. The first branch portion 6b of the hot runner 6 is connected to the first corresponding portion 5a via the first valve gate 8, and the second branch portion 6c is connected to the second corresponding portion 5b via the second valve gate 9. Connected to.

After completion of the mold clamping of the molding die 2, as shown in FIG. 4, the first valve gate 8 and the second valve gate 9 are opened, and the molten foaming resin 11 is supplied to the cavity 5 by the injection device 31. .. In this embodiment, the opening degrees of the first valve gate 8 and the second valve gate 9 are set so that the foamable resin 11 is completely filled in the first corresponding portion 5a and the second corresponding portion 5b at substantially the same time. There is.

The first valve gate 8 and the second valve gate 9 are closed when the first set time has elapsed since the motor of the moving mechanism of the screw drive device 37 was driven. This first set time is a time such that the amount of the foamable resin 11 required for molding the main body 61 of the foamed resin molded product 60 is filled in the first corresponding portion 5a and the second corresponding portion 5b of the cavity 5. It is set in advance.

The movable die drive device 26 of the die opening/closing device 21 when a predetermined time has passed from the time when the first valve gate 8 and the second valve gate 9 were closed (when the filling of the foaming resin 11 into the cavity 5 was completed). Thus, the movable die 4 starts to retreat in the die opening direction of the forming die 2. The movable die 4 retracts from the die clamping position by a preset amount (see FIG. 5). This set amount is an amount obtained by subtracting the thickness of the main body 61 obtained when it is assumed that the foamed resin molded product 60 is molded in the mold clamped state from the thickness of the main body 61. The foamable resin 11 foams as the movable mold 4 retracts.

In the present embodiment, from the time when the filling of the foamable resin 11 into the cavity 5 is completed to the elapse of the predetermined time (that is, from the time when the filling of the foamable resin 11 into the cavity 5 is completed to the start of the retreat of the movable die 4). In the meantime), the control valves 43, 48, 53 are opened so that the heating water flows in the fixed side and movable side heating water channels 41, 46 and the cooling water flows in the cooling water channel 51. Thereby, the foamable resin 11 in the first corresponding portion 5a of the cavity 5 is heated and the foamable resin 11 in the second corresponding portion 5b is cooled.

In the present embodiment, in the second corresponding portion 5b, the foamable resin 11 is cooled by the cooling water on the movable mold 4 side, while the foamable resin 11 is heated by the heated water on the fixed mold 3 side. The foamable resin 11 in the corresponding portion 5b is cooled as a whole. This is because the amount of heat transferred to the fixed mold 3 is large, and therefore when the fixed mold 3 side is also cooled by cooling water, the foamable resin 11 in the second corresponding portion 5b is cooled too much.

In the first corresponding portion 5a, the foamable resin 11 is heated on both sides of the fixed mold 3 side and the movable mold 4 side. However, the heating only slows down the rate of decrease in the temperature of the foamable resin 11, and the temperature of the foamable resin 11 decreases due to heat transfer to the fixed mold 3 and the movable mold 4.

Since the heat transfer to the movable mold 4 is hindered by the skin material 62, the temperature decrease rate of the foamable resin 11 in the second corresponding portion 5b is lower than the temperature decrease rate of the foamable resin 11 in the first corresponding portion 5a. Is also slow. Therefore, when the foamable resin 11 in the first corresponding portion 5a is heated and the foamable resin 11 in the second corresponding portion 5b is not cooled, the first response is completed when the filling of the foamable resin 11 into the cavity 5 is completed. Even if the temperature of the foamable resin 11 is the same between the portion 5a and the second corresponding portion 5b, the temperature difference between the two becomes larger thereafter. Therefore, when the movable mold 4 is started to retract after the completion of the filling of the foamable resin 11 into the cavity 5, the first corresponding portion 5a and the second corresponding portion 5b are separated from each other at the start of the backward movement (that is, at the start of foaming). The temperature of the foamable resin 11 is different, and as a result, the foamability of the foamable resin 11 is different between the first corresponding portion 5a and the second corresponding portion 5b, and the size of the bubbles of the foamable resin 11 after foaming is different. Will be different.

On the other hand, in the present embodiment, the foamable resin 11 in the first corresponding portion 5a is heated and the second corresponding portion 5a is heated from the completion of the filling of the foamable resin 11 into the cavity 5 to the elapse of the predetermined time. Since the foamable resin 11 in 5b is cooled, the rate of decrease in temperature of the foamable resin 11 in the second corresponding portion 5b at the beginning of filling is the rate of decrease in temperature of the foamable resin 11 in the first corresponding portion 5a. Since the temperature of the foamable resin 11 is different between the first corresponding portion 5a and the second corresponding portion 5b because it is slower, the rate of decrease of the temperature of the foamable resin 11 in the first corresponding portion 5a becomes gradually slower. On the other hand, since the temperature of the foamable resin 11 in the second corresponding portion 5b decreases gradually, the temperature of the foamable resin 11 may be the same between the first corresponding portion 5a and the second corresponding portion 5b. During the predetermined period including the time when the temperature of the foamable resin 11 becomes the same between the first corresponding portion 5a and the second corresponding portion 5b, the first corresponding portion 5a and the second corresponding portion 5b have the same temperature. It can be said that the temperatures are almost the same. The predetermined time is set such that the movable die 4 starts to move backward during the predetermined period.

In this way, the first corresponding portion 5a and the second corresponding portion 5b have substantially the same temperature of the foamable resin 11 when the movable die 4 starts to retract (when foaming starts). In the second corresponding portion 5b, the foamability of the foamable resin 11 becomes substantially the same, and the sizes of the bubbles of the foamable resin 11 after foaming become uniform.

A state in which the mold opening of the mold 2 is started and the mold opening is completed when the second set time set in advance such that the foamable resin 11 is completely solidified has elapsed from the completion of the retreat of the movable mold 4. Then, the foamed resin molded product 60 is taken out from the cavity 5.

Therefore, in the present embodiment, the foamable resin 11 in the first corresponding portion 5a of the cavity 5 is heated while the predetermined time elapses after the filling of the foamable resin 11 into the cavity 5 is completed, and Since the foamable resin 11 in the second corresponding portion 5b is cooled, the foamability of the foamable resin 11 can be made substantially the same in the first corresponding portion 5a and the second corresponding portion 5b, and foaming after foaming can be achieved. It becomes possible to make the sizes of the bubbles of the resin 11 uniform. Therefore, bubbles having a uniform size can be obtained in the entire foamable resin 11.

The present invention is not limited to the above-mentioned embodiment, and can be substituted within the scope not departing from the spirit of the claims.

For example, in the above embodiment, the foamable resin 11 in the first corresponding portion 5a of the cavity 5 is heated and the foamable resin 11 in the second corresponding portion 5b is cooled. If the temperature of the foamable resin 11 at the start of retreat of the movable mold 4 can be made substantially the same as that of the second corresponding portion 5b, heating of the foamable resin 11 in the first corresponding portion 5a and the second corresponding portion 5b Only one of the foamable resins 11 in the corresponding portion 5b may be executed.

Further, even if the temperatures of the foamable resin 11 at the time of starting the retreat of the movable mold 4 cannot be made substantially the same between the first corresponding portion 5a and the second corresponding portion 5b, at the time of starting the backward movement of the movable mold 4 (at the time of starting foaming). ), heating the foamable resin 11 in the first corresponding portion 5a so that the temperature of the foamable resin in the second corresponding portion 5b of the cavity 5 approaches the temperature of the foamable resin in the first corresponding portion 5a, and You may only perform at least one of the foamable resins 11 in the 2nd corresponding part 5b.

Further, in the above embodiment, the skin material 62 is provided on a part of the front side surface of the foamed resin molded product 60. The material and the like may be integrally provided. The core material, the sound absorbing material and the like are partially set on the molding surface 3 a of the fixed mold 3. However, a hole is formed in the core material, the sound absorbing material, or the like so as not to close the opening to the cavity 5 in the second branch portion 6c of the hot runner 6. As described above, the foamed resin molded product 60 may be one in which a predetermined member is integrally provided on a part of the front side surface or the back side surface. The predetermined member may be a member that prevents the heat of the foamable resin 11 filled in the cavity 5 from being transferred to the fixed mold 3 or the movable mold 4.

The embodiments described above are merely examples, and the scope of the present invention should not be limitedly interpreted. The scope of the present invention is defined by the scope of the claims, and all modifications and changes belonging to the equivalent range of the scope of the claims are within the scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention is useful for a method for molding a foamed resin molded product in which a predetermined member is integrally provided on a part of the front surface or the back surface.

1 Molding Device for Foamed Resin Molded Product 2 Mold 3 Fixed Mold 3a Molding Surface 4 Movable Mold 4a Molding Surface 5 Cavity 5a First Corresponding Part 5b Second Corresponding Part 6 Hot Runner (Filling Means)
8 First valve gate (filling means)
9 Second valve gate (filling means)
11 Molten Foaming Resin 26 Movable Type Driving Device (Movable Type Driving Means)
31 injection device (filling means)
41 Fixed side heating water channel (resin temperature adjusting means)
42 Fixed side heated water supply pipe (resin temperature adjusting means)
43 control valve 44 heating device (resin temperature adjusting means)
46 Movable heating channel (resin temperature adjusting means)
47 Movable-side heated water supply pipe 48 Control valve 51 Cooling water channel 52 Cooling water supply pipe 53 Control valve 54 Cooling pipe (resin temperature adjusting means)
60 Foamed resin molded product 62 Skin material 62a Skin layer 62b Cushion layer

Claims (6)

A method of molding a foamed resin molded article, wherein a predetermined member is integrally provided on a part of the front surface or the back surface,
A setting step of partially setting the predetermined member on a molding surface of the fixed mold or the movable mold in a molding mold having a fixed mold and a movable mold;
After the completion of the setting step, a filling step of filling a molten foamable resin into a cavity formed between the fixed die and the movable die by clamping the molding die,
After the completion of the filling step, a foaming step of retracting the movable mold in the mold opening direction of the molding mold to foam the foamable resin is provided,
In the filling step, the foaming is performed in a first corresponding portion corresponding to a side where the predetermined member is not set in the cavity and a second corresponding portion corresponding to a side where the predetermined member is set in the cavity. Is a step of completing the filling of the resin at about the same time,
After starting the filling step and before starting the foaming step, heating the foamable resin in the first corresponding portion of the cavity, and heating the foamable resin in the second corresponding portion of the cavity. A method for molding a foamed resin molded article, further comprising a resin temperature adjusting step of performing at least one of cooling. The method for molding a foamed resin molded article according to claim 1,
When the temperature of the foamable resin in the first corresponding portion of the cavity is substantially the same as the temperature of the foamable resin in the second corresponding portion of the cavity, the movable mold is retracted in the foaming step. A method for molding a foamed resin molded article, the method comprising: The method for molding a foamed resin molded article according to claim 1 or 2,
The method for molding a foamed resin molded product, wherein the predetermined member is a skin material provided on a front side surface of the foamed resin molded product. The method for molding a foamed resin molded article according to claim 3,
The above-mentioned skin material has a skin layer and a cushion layer provided on the back side of the skin layer, and a method for molding a foamed resin molded article. The method for molding a foamed resin molded article according to claim 3 or 4,
The method for molding a foamed resin molded product, wherein the foamed resin molded product is an interior material for a vehicle. A molding device for a foamed resin molded product, wherein a predetermined member is integrally provided on a part of the front surface or the back surface,
A mold having a fixed mold and a movable mold, and capable of partially setting the predetermined member on the molding surface of the fixed mold or the movable mold;
Movable mold driving means for moving the movable mold so as to approach and separate from the fixed mold to perform mold clamping and mold opening of the molding mold,
When the predetermined member is partially set on the molding surface of the movable mold and the molding mold is clamped, the molten foaming property is generated in the cavity formed between the fixed mold and the movable mold. And a filling means for filling the resin,
The movable die driving means is configured to retreat the movable die in the mold opening direction of the molding die to foam the foamable resin after the filling of the foamable resin into the cavity by the filling means is completed. ,
In the filling means, the first corresponding portion corresponding to the side where the predetermined member is not set in the cavity and the second corresponding portion corresponding to the side where the predetermined member is set in the cavity are foamed. It is configured to complete the filling of the conductive resin at approximately the same time,
Heating the foamable resin in the first corresponding portion of the cavity after starting the filling of the cavity by the filling means and before starting the retreat of the movable die by the movable die driving means; and A molding apparatus for a foamed resin molded product, further comprising a resin temperature adjusting means for performing at least one of cooling the foamable resin in the second corresponding portion of the cavity.

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