JP7270921B2 - Molding method for foamed resin molded product - Google Patents

Description

TECHNICAL FIELD The present invention belongs to a technical field related to a molding method and a molding apparatus for a foamed resin molded article having a predetermined member integrally provided on a part of the front side or the back side.

2. Description of the Related Art Conventionally, molding methods and molding apparatuses for foamed resin moldings integrally provided with predetermined members (core material, skin material, etc.) on the front side or the back side are well known. For example, in Patent Documents 1 and 2, when the mold is opened, a core material and a skin material are set in the mold, and the mold is clamped to form between a fixed mold and a movable mold. Filling the cavity with a molten foamable resin is disclosed. Further, Patent Document 1 discloses that after the filling of the foamable resin into the cavity is completed, the movable mold is retreated in the opening direction of the mold (so-called core-back) to foam the foamable resin. It is

JP 2010-082842 A JP 2008-173896 A

By the way, the predetermined member may be provided on a part of the front side surface or the back side surface of the 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. The first corresponding portion corresponding to the side of the cavity on which the predetermined member is not set and the second corresponding portion corresponding to the side on which the predetermined member is set are filled with the molten expandable resin substantially simultaneously. After the filling is completed, the movable mold is retracted in the opening direction of the mold, thereby foaming 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, the first corresponding portion and the second corresponding portion of the cavity are normally filled with a foamable material. There is a problem that the cooling speed of the resin is different. In other words, 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 has a heat resistance relative to the first corresponding portion. As a result, the cooling rate of the foamable resin slows down.

For this reason, when the retraction of the movable mold (core back) is started at a certain timing after the completion of filling the entire cavity with the foamable resin, at the start of the retraction (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 foamability of the foamable resin differs between the first corresponding portion and the second corresponding portion, and the foamable resin after foaming The size of the bubbles will be different.

The present invention has been made in view of this point, and its object is to provide a uniform foaming resin over the entire foamable resin when a predetermined member is partially set on the molding surface of a fixed mold or a movable mold. To provide a molding method and a molding apparatus for a foamed resin molded article by which air bubbles of an appropriate size can be obtained.

In order to achieve the above object, a first aspect of the present invention is directed to 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, and includes a fixed mold and a movable mold. a setting step of partially setting the predetermined member on the molding surface of the fixed mold or the movable mold in a mold having a mold; 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 a mold opening direction of the mold after the filling step. The movable mold is divided into a first divided portion corresponding to the side on which the predetermined member is not set and a second divided portion corresponding to the side on which the predetermined member is set. In the filling step, the foamable resin is filled substantially simultaneously in a first corresponding portion corresponding to the first divided portion in the cavity and a second corresponding portion in the cavity corresponding to the second divided portion. In the foaming step, the second split portion of the movable mold is retracted in the mold opening direction of the mold with a delay with respect to the first split portion, and the second split portion in the foaming step is moved backward. The retraction of the divided portion is such that the temperature of the foamable resin in the second corresponding portion of the cavity is equal to the temperature of the foamable resin in the first corresponding portion of the cavity at the start of retraction of the first divided portion. It shall start when it becomes approximately the same .

According to the molding method described above, the rate of decrease in the temperature of the foamable resin in the second corresponding portion of the cavity is slower than the rate of decrease in the temperature of the foamable resin in the first corresponding portion of the cavity. By retreating with a delay with respect to the first divided portion, the temperature of the foamable resin in the second corresponding portion when the second divided portion starts retreating is changed to that of the first corresponding portion when the first divided portion starts retreating It can be close to or about the same as the temperature of the foamable resin. As a result, the foamability of the foamable resin becomes substantially the same between the first corresponding portion and the second corresponding portion, and the sizes of the cells of the foamable resin after foaming can be made uniform. The predetermined member may be any 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 product, the retraction of the second divided portion in the foaming step is performed when the temperature of the foamable resin in the second corresponding portion of the cavity is at the start of retraction of the first divided portion. is approximately the same as the temperature of the foamable resin in the first counterpart of the cavity.

This makes it possible to more reliably obtain bubbles of uniform size throughout the foamable resin.

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

As a result, it is possible to improve the appearance of the foamed resin molded product and the feeling when a person touches the predetermined member (skin material).

In one 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 surface of the skin layer.

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

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

As a result, it is possible to obtain a foamed resin molded product suitable for use as an interior material that requires good appearance in a vehicle or an interior material that is likely to be touched by vehicle occupants.

The object may be a molding apparatus for a foamed resin molded article in which a predetermined member is integrally provided on a part of the front side surface or the back side surface. The molding apparatus has a fixed mold and a movable mold, a mold capable of partially setting the predetermined member on the molding surface of the fixed mold or the movable mold, and the movable mold close to the fixed mold. and a movable mold driving means for closing and opening the mold by moving them away from each other, and the predetermined member partially set on the molding surface of the movable mold and the mold is clamped. filling means for filling a cavity formed between the fixed mold and the movable mold with a molten foamable resin when the movable mold is filled with the foamable resin into the cavity; after filling, the movable mold is retracted in the mold opening direction to foam the foamable resin, and the movable mold is a first divided portion corresponding to the side on which the predetermined member is not set and a second divided portion corresponding to the side on which the predetermined member is set, and the filling means includes a first corresponding portion corresponding to the first divided portion in the cavity, and the The second corresponding portion corresponding to the second divided portion is configured to complete the filling of the expandable resin substantially at the same time, and the movable type driving means moves the second divided portion of the movable type to the second corresponding portion. A delay means is provided for starting the retraction of the mold in the mold opening direction with a delay with respect to the one divided portion.

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

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

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view (partial cross section view) which shows the outline of the molding apparatus of the foaming resin molding based on embodiment of this invention. It is a cross-sectional view showing a simplified foamed resin molded product. FIG. 4 is a cross-sectional view of the mold, stationary platen, and movable platen, showing a state in which mold clamping is completed with the skin material set on the molding surface of the movable mold. FIG. 4 is a view equivalent to FIG. 3 showing a state in which molten foamable resin is being supplied to the first corresponding portion and the second corresponding portion of the cavity; FIG. 4 is a view equivalent to FIG. 3 showing a state in which only the first divided portion of the movable mold is retracted in the mold opening direction of the mold; FIG. 4 is a view equivalent to FIG. 3 showing a state in which the first divided portion and the second divided portion of the movable mold have completely retracted in the opening direction of the mold; It is a graph which shows the temperature change after the completion of each filling of the expandable resin in the 1st corresponding part of a cavity, and the 2nd corresponding part. FIG. 4 is a view equivalent to FIG. 3 showing a state in which mold clamping is completed with the skin material set on the molding surface of the movable mold in another embodiment of the delay means; 4 is a view equivalent to FIG. 3 showing a state in which only the first divided portion of the movable mold is retracted in the mold opening direction of the mold in the above another embodiment. FIG. 4 is a view equivalent to FIG. 3 showing a state in which the first divided portion and the second divided portion of the movable mold have completely retreated in the mold opening direction of the mold in the above another embodiment. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an outline of a molding apparatus 1 for foamed resin moldings according to an embodiment of the present invention. This molding apparatus 1 includes a molding die 2 having a fixed mold 3 and a movable mold 4, a molding die opening/closing device 21 for clamping and opening the molding die 2, and a fixed mold 3 by clamping the molding die 2. An injection device 31 is provided for injecting and filling the cavity 5 formed between the movable mold 4 and the molten foamable resin 11 (see FIGS. 4 to 6). The surface of the stationary mold 3 in contact with the cavity 5 is the molding surface 3 a of the fixed mold 3 , and the surface of the movable mold 4 in contact with the cavity 5 is the molding surface 4 a of the movable mold 4 .

The injection device 31 has a heating cylinder 32 connected to the fixed mold 3 of the mold 2 and a hot runner 6 provided on a fixed platen 22 which will be described later. A hopper 33 is connected to the heating cylinder 32 . . The hopper 33 is charged with pellets of an expandable resin material (eg, polypropylene) and a chemical foaming agent in the case of chemical foaming, and only the pellets are charged in the case of physical foaming. In the case of physical bubbling, gas (nitrogen, carbon dioxide, etc.) is injected from the gas injection part 34 connected to the heating cylinder 32 . Pellets charged into the hopper 33 are supplied into the heating cylinder 32 and melted in the heating cylinder 32 by a heater (not shown). The chemical foaming agent generates foaming gas by thermal decomposition within the heating cylinder 32 .

Inside 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. As shown in FIG. The end (rear end) of the screw opposite to the molding die 2 has a screw driving device 37 having a rotating mechanism (including a motor) for rotating the screw and a moving mechanism (including a motor) for moving the screw. connected to Then, the screw is rotated by the rotation mechanism of the screw driving device 37 and moved (advanced) toward the molding die 2 by the movement mechanism, so that 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 portion 6a connected to the heating cylinder 32, and a first branch portion 6b and a second branch portion 6c branched from the common portion 6a and connected to the cavities 5, respectively. A first valve gate 8 and a second valve gate 9 for opening and closing the openings of the first branch portion 6b and the second branch portion 6c to the cavity 5 are provided, respectively.

The mold opening/closing device 21 has a fixed platen 22 to which the fixed mold 3 is attached, a movable platen 23 to which the movable mold 4 is attached, and a movable mold driving device 26 connected to the movable platen 23 . In this embodiment, the movable drive device 26 has a hydraulic cylinder, although detailed illustration is omitted, and the movable platen 23 and the movable mold 4 are moved to the stationary mold 3 by supplying and discharging hydraulic pressure to the hydraulic cylinder. move toward and away from

The movable platen 23 is provided with a plurality of tubular members 24 extending horizontally toward the stationary platen 22 , and the stationary platen 22 has a plurality of tubular members 24 each horizontally extending toward the movable platen 23 within the plurality of tubular members 24 . A shaft member 25 is provided. Each shaft member 25 is provided with a sliding portion 25a having an outer diameter approximately the same as the inner diameter of each cylindrical member 24. When the movable platen 23 and the movable mold 4 are moved, the sliding portion 25a of each shaft member 25 As the 25a slides inside each cylindrical member 24, the movable platen 23 and the movable die 4 are guided to move in the horizontal direction. In this manner, the movable mold driving device 26 moves the movable mold 4 toward and away from the fixed mold 3 to close and open the mold 2 . In addition, the movable mold driving device 26 retracts the movable mold 4 in the opening direction of the mold 2 from the closed state of the mold 2 in order to foam the foamable resin 11 filled in the cavity 5 (so-called core). It also has a role of backing up.

In this embodiment, the movable mold 4 is divided into a first divided portion 4A corresponding to the side on which the skin material 62 described below is not set, and a second divided portion 4B corresponding to the side on which the skin material 62 is set. there is

The movable drive device 26 includes a first division drive cylinder 27 (a rod of the first division drive cylinder 27 in FIGS. 1 and 3 to 6) that moves the first division 4A independently of the movable platen 23. (only the tip of the tip is shown). The first split portion drive cylinder 27 is hydraulically driven.

In addition, the movable drive device 26 includes one or more (in this embodiment, more than one) compression coil springs 28 that urge the second divided portion 4B against the movable platen 23 in the clamping direction of the mold 2, It has a connecting member 29 provided between the movable platen 23 and the second divided portion 4B.

As will be described later, even if the movable platen 23 retreats from the clamping position in the mold opening direction of the molding die 2 by a preset set amount, the second divided portion 4B is not retreated by the connecting member 29. It is held at the mold closing position by the biasing force of the compression coil spring 28 . On the other hand, when the movable platen 23 is further retracted from the position at which it is retracted by the set amount, the second divided portion 4B is configured to be retracted together with the movable platen 23 by the connecting member 29 .

Hydraulic cylinder and first division drive cylinder 27 in movable drive device 26 (more specifically, valves for supplying and discharging hydraulic pressure to hydraulic cylinder and first division drive cylinder 27), rotation mechanism and movement in screw drive device 37 Each motor of the mechanism and the operation of the first and second valve gates 8,9 are controlled by a control unit 50. FIG. The control unit 50 is a well-known microcomputer-based controller, and executes computer programs (including basic control programs such as an OS, and application programs that are started on the OS to achieve specific functions). It includes a central processing unit (CPU), a memory such as RAM and ROM for storing programs and data, and an input/output (I/O) bus for inputting and outputting various signals.

In this embodiment, the movable driving device 26 constitutes the 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), and the first valve gate 8. and the second valve gate 9 constitute filling means. Further, the first split portion driving cylinder 27, the compression coil spring 28 and the connecting member 29 constitute delay means.

In this embodiment, the foamed resin molded product molded by the molding apparatus 1 (molding die 2) has a skin material 62 as a predetermined member integrally formed on a part of the front surface, as shown in FIG. It is a foamed resin molded product 60 provided in . That is, the foamed resin molded product 60 has a body portion 61 formed by solidifying the foamable resin 11 filled in the cavity 5, and a skin material 62 integrally provided on a part of the front surface of the body portion 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 expandable resin 11 from being transferred to the movable mold 4 at the portion (the second corresponding portion 5b described later).

In this embodiment, the skin material 62 is a contractile member having a skin layer 62a and a cushion layer 62b provided on the back 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, electron beam crosslinked polyolefin foam (PEF). In addition, the skin material 62 may not be a contractile member (it may not have the cushion layer 62b).

The foamed resin molded product 60 is used, for example, as an interior material for vehicles. Specific examples of vehicle interior materials include trims (such as door trims), center consoles, and trunk boards. A skin material is provided at a portion of the surface of these interior materials that is likely to be touched by an occupant.

Next, a molding method for the foamed resin molding 60 shown in FIG. 2 will be described with reference to FIGS. 3 to 6. FIG.

First, an operator partially sets the skin material 62 on the molding surface 4a of the movable mold 4 while the mold 2 is open. In this embodiment, the skin material 62 is set on the molding surface 4a of the second divided portion 4B. 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 stick into the skin material 62, and the skin material 62 is supported on the molding surface 4a by the plurality of support members. is set.

After that, when the operator operates the switch, the operation information is input to the control unit 50, and based on the command from the control unit 50 to which this operation information is input, the mold 2 is closed and the next mold opening is performed. A series of operations for molding the foamed resin molded product 60 are performed until the end.

Specifically, the movable mold 4 on which the skin material 62 is set is moved toward the fixed mold 3 by the movable mold driving device 26 of the mold opening/closing device 21, and the mold 2 is clamped. In the clamped state, the second divided portion 4B of the movable mold 4 is pressed against the fixed mold 3 by the biasing force of the compression coil spring 28. As shown in FIG.

As shown in FIG. 3, in the clamped state of the mold 2, the cavity 5 includes a first corresponding portion 5a corresponding to the first divided portion 4A (corresponding to the side where the skin material 62 is not set), It is divided into a second corresponding portion 5b (corresponding to the side on which the skin material 62 is set) corresponding to the second divided portion 4B. 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 the mold 2 is completely clamped, as shown in FIG. 4, the first valve gate 8 and the second valve gate 9 are opened, and the injection device 31 supplies the molten foamable resin 11 to the cavity 5. . In this embodiment, the opening degrees of the first valve gate 8 and the second valve gate 9 are set so that the filling of the expandable resin 11 is completed substantially simultaneously in the first corresponding portion 5a and the second corresponding portion 5b. there is

The first valve gate 8 and the second valve gate 9 are closed when a first set time elapses after the motor of the movement mechanism of the screw driving device 37 is driven. The first set time is such that the first corresponding portion 5a and the second corresponding portion 5b of the cavity 5 are filled with the amount of foamable resin 11 necessary for molding the body portion 61 of the foamed resin molded product 60. preset.

When the first predetermined time elapses from when the first valve gate 8 and the second valve gate 9 are closed (when the filling of the foamable resin 11 into the cavity 5 is completed), the mold opening/closing device 21 is driven to move the movable mold. The device 26 causes the movable platen 23 to start retracting in the mold opening direction of the mold 2 . When the movable platen 23 is retracted, the first divided portion 4A is also retracted in the mold opening direction together with the movable platen 23 by the first divided portion drive cylinder 27 (see FIG. 5). On the other hand, the second split portion 4B is held at the mold clamping position by the biasing force of the compression coil spring 28 . As a result, only the first divided portion 4A of the movable mold 4 retreats in the mold opening direction of the mold 2. As shown in FIG. Due to the retraction of the first divided portion 4A, the expandable resin 11 in the first corresponding portion 5a is expanded.

The first divided portion 4A (and the movable platen 23) retreats from the mold clamping position by the set amount. This set amount is the amount obtained by subtracting the thickness of the body portion 61 obtained when it is assumed that the foamed resin molded product 60 is molded in a clamped state from the thickness of the body portion 61 . Even if the movable platen 23 retreats from the mold clamping position by the set amount in this way, the second divided portion 4B is held at the mold clamping position by the biasing force of the compression coil spring 28 .

During the first predetermined time, the temperature of the expandable resin 11 in the first corresponding portion 5a at the start of the retreat of the first divided portion 4A is adjusted appropriately so that the foaming of the expandable resin 11 in the first corresponding portion 5a is performed. The time is set for the temperature to drop to such a level that fine, uniform-sized bubbles can be obtained.

When the second predetermined time (longer than the first predetermined time) has passed since the filling of the foamable resin 11 into the cavity 5 was completed, the movable platen 23 further starts retreating in the mold opening direction. During the retraction of the movable platen 23, the first divided portion drive cylinder 27 moves the first divided portion 4A relative to the movable platen 23 in the mold clamping direction so that the first divided portion 4A does not move from the position where the movement of the set amount is completed. (See FIG. 6).

During the second predetermined time, the temperature of the expandable resin 11 in the second corresponding portion 5b at the start of the retreat of the second divided portion 4B is adjusted appropriately so that the foaming of the expandable resin 11 in the second corresponding portion 5b is performed. (substantially the same temperature as the temperature of the expandable resin 11 in the first corresponding portion 5a when the first divided portion 4A starts to retreat). The retraction speed at which the second split portion 4B is retracted by the set amount is the retraction speed of the second split portion 4B from the completion of filling of the expandable resin 11 into the cavity 5 to the elapse of the second predetermined time. is set to a value such that

As shown in FIG. 7, when the foaming resin 11 is completely filled into the cavity 5, the temperatures of the foaming resin 11 in the first corresponding portion 5a and the second corresponding portion 5b are both T1. Then, at time t1 when the first predetermined time has passed since the completion of filling, the temperature of the expandable resin 11 in the first corresponding portion 5a becomes T2. Since the heat transfer to the movable mold 4 is inhibited by the skin material 62, the rate of decrease in the temperature of the foamable resin 11 in the second corresponding portion 5b is lower than the rate of decrease in the temperature of the foamable resin 11 in the first corresponding portion 5a. As a result, at time t1, the temperature of the expandable resin 11 in the second corresponding portion 5b becomes T3 (>T2). Therefore, if the second divided portion 4B is also retracted at the time t1 like the first divided portion 4A, the expandability of the expandable resin 11 is reduced between the first corresponding portion 5a and the second corresponding portion 5b. Otherwise, the size of the cells in the foamable resin 11 after foaming will be different.

In contrast, in the present embodiment, the second divided portion 4B is retracted at substantially the same time as the time t2 when the temperature of the expandable resin 11 in the second corresponding portion 5b reaches T2. That is, when the temperature of the foamable resin 11 in the second corresponding portion 5b becomes substantially the same as the temperature T2 of the foamable resin 11 in the first corresponding portion 5a when the first divided portion 4A starts to retract, the second The second predetermined time is set so that the split portion 4B starts to move backward.

In this way, the temperature of the foamable resin 11 in the second corresponding portion 5b when the second divided portion 4B starts to retreat is the same as the temperature of the foamable resin 11 in the first corresponding portion 5a when the first divided portion 4A starts to retreat. By making the temperature T2 substantially the same, the foamability of the foamable resin 11 becomes substantially the same between the first corresponding portion 5a and the second corresponding portion 5b, and the size of the cells of the foamable resin 11 after foaming is increased. It will be aligned.

The temperature of the foamable resin 11 in the second corresponding portion 5b when the second divided portion 4B starts to retreat is the temperature of the foamable resin 11 in the first corresponding portion 5a when the first divided portion 4A starts to retreat. The second split portion 4B may simply be retracted with respect to the first split portion 4A so as to approach T2.

By further retracting the movable platen 23 , the second divided portion 4</b>B is retracted in the mold opening direction together with the movable platen 23 by the connecting member 29 . Similarly to the first split portion 4A, the second split portion 4B is also retracted from the mold clamping position by the set amount. The movable platen 23 retreats from the mold clamping position by twice the amount set above.

When the second set time, which is set in advance to allow the foamable resin 11 to completely solidify, has elapsed since the retraction of the movable mold 4 was completed (the retraction of the second divided portion 4B was completed), the movable platen 23 was moved to the first position. Further retraction is started together with the split portion 4A and the second split portion 4B (the opening of the mold 2 is started). Then, the foamed resin molded product 60 is taken out from the cavity 5 in a state where the mold opening is completed.

Therefore, in the present embodiment, the second divided portion 4B of the movable mold 4 is caused to start retreating in the mold opening direction of the mold 2 with a delay from the first divided portion 4A. The foamability of the foamable resin 11 can be made substantially the same between the second corresponding portion 5b and the second corresponding portion 5b, and the sizes of the cells of the foamable resin 11 after foaming can be made 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 embodiments, and substitutions are possible without departing from the scope of the claims.

For example, in the above-described embodiment, the first split portion drive cylinder 27, the compression coil spring 28, and the connecting member 29 move the second split portion 4B of the movable mold 4 to the mold 2 with a delay from the first split portion 4A. Although the delay means for starting the retraction in the opening direction is configured, the delay means is not limited to this configuration.

For example, as shown in FIGS. 8 to 10, instead of the compression coil spring 28 and the connecting member 29, one or a plurality of second division driving cylinders 30 (first division driving cylinders 30) hydraulically drive the second division 4B. (Like the cylinder 27, controlled by the control unit 50), the delay means may be provided by the first split drive cylinder 27 and the second split drive cylinder 30. That is, the first divided portion 4A and the second divided portion 4B are configured to be separately drivable by the first divided portion drive cylinder 27 and the second divided portion drive cylinder 30, respectively.

Then, when the first predetermined time has passed since the filling of the expandable resin 11 into the cavity 5 was completed, the first divided portion driving cylinder 27 is driven to move the first divided portion 4A from the clamped state of FIG. The mold 2 is started to retreat in the mold opening direction. During the retraction of the first split portion 4A, the movable platen 23 and the second split portion 4B are prevented from moving from the mold clamping position. The first dividing portion 4A retreats by the set amount (see FIG. 9).

Further, when the second predetermined time has passed since the filling of the foamable resin 11 into the cavity 5 was completed, the movable platen 23 starts to retreat in the mold opening direction together with the second divided portion 4B. During the retreat of the second divided portion 4B, the first divided portion 4A is moved in the mold clamping direction relative to the movable platen 23 by the first divided portion driving cylinder 27 so as to be positioned at the position retreated by the set amount. is moved (see FIG. 10).

In the above-described embodiment, the skin material 62 is provided on a part of the front side surface of the foamed resin molded product 60, but a core material and a sound absorbing material are provided as predetermined members on a part of the back side surface of the foamed resin molded product 60. A material or the like may be integrally provided. A core material, a sound absorbing material, and the like are partially set on the molding surface 3 a of the fixed mold 3 . However, holes are formed in the core material, the sound absorbing material, etc. so as not to block the opening of the hot runner 6 to the cavity 5 at the second branch portion 6c. 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. This predetermined member may be any 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 above-described embodiments are merely examples, and should not be construed as limiting the scope of the present invention. The scope of the present invention is defined by the scope of claims, and all variations and modifications within the equivalent scope of the claims are within the scope of the invention.

INDUSTRIAL APPLICABILITY The present invention is useful for 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 or the back side.

1 Molding apparatus for foamed resin molded product 2 Mold 3 Fixed mold 3a Molding surface 4 Movable mold 4a Molding surface 4A First division part 4B Second division part 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 foamable resin 26 Movable driving device (movable driving means)
27 1st split drive cylinder (delay means)
28 compression coil spring (delay means)
29 connecting member (delay means)
30 Second division drive cylinder (delay means)
31 injection device (filling means)
60 foamed resin molded product 62 skin material 62a skin layer 62b cushion layer

Claims (4)

A method for molding a foamed resin molded product in which a predetermined member is integrally provided on a part of the front side or the back side,
a setting step of partially setting the predetermined member on the molding surface of the fixed mold or the movable mold in a mold having a fixed mold and a movable mold;
a filling step of filling a cavity formed between the fixed mold and the movable mold by clamping the mold after the setting step is completed, with a molten foamable resin;
a foaming step of foaming the foamable resin by retracting the movable mold in a mold opening direction of the mold after the filling step is completed;
The movable mold is divided into a first divided portion corresponding to the side on which the predetermined member is not set and a second divided portion corresponding to the side on which the predetermined member is set,
In the filling step, filling of the expandable resin into a first corresponding portion corresponding to the first divided portion in the cavity and a second corresponding portion corresponding to the second divided portion in the cavity is completed substantially simultaneously. is a process,
In the foaming step, the second divided portion of the movable mold is retreated in the mold opening direction of the mold with a delay with respect to the first divided portion ,
The retraction of the second divided portion in the foaming step is performed so that the temperature of the expandable resin in the second corresponding portion of the cavity is higher than that in the first corresponding portion of the cavity at the start of retraction of the first divided portion. A method for molding a foamed resin molded article, characterized in that the molding is started when the temperature of the foamed resin becomes substantially the same as that of the foamable resin. In the method for molding a foamed resin molded product according to claim 1 ,
A molding method for a foamed resin molded product, wherein the predetermined member is a skin material provided on the front surface of the foamed resin molded product. In the method for molding a foamed resin molded product according to claim 2 ,
A method of molding a foamed resin molded product, wherein the skin material has a skin layer and a cushion layer provided on the back surface of the skin layer. In the method for molding a foamed resin molded product according to claim 2 or 3 ,
A method for molding a foamed resin molded article, wherein the foamed resin molded article is an interior material for a vehicle.

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