JP2017061149A - Method for manufacturing resin molding and apparatus for manufacturing resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a resin molding capable of easily obtaining good adhesiveness between resin plates which are mutually and integrally laminated.SOLUTION: In a method for manufacturing a resin molding, a first step of filling a cavity formed between a first mold plate (fixing core) and a second mold plate (plate portion of movable core) with a molten resin while gradually expanding a facing gap between the first mold plate and the second mold plate, and a second step of stopping the expansion of the facing gap, and curing the resin filling the cavity, and thereby forming the resin plate are repeatedly performed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a resin molded product manufacturing method and a resin molded product manufacturing apparatus.

As a method for producing a resin molded product, there is one described in Patent Document 1.
In this method, a step of filling a molten resin through a flow path formed in a fixed plate into a cavity between a movable plate and a fixed plate arranged opposite to each other, and curing the filled resin to form a resin plate And a step of cutting and removing the runner protruding from the resin plate by opening the fixing plate.
After that, this method includes a step of forming a new cavity by moving the movable plate away from the fixed plate side, a step of closing the fixed plate and filling the cavity with molten resin again, and curing the newly filled resin. By repeating as many times as necessary the process of newly molding the resin plate to be laminated on the previously molded resin plate and the step of cutting and removing the runner protruding from the newly molded resin plate by opening the fixed plate, A resin molded product integrally having a plurality of resin plates laminated together is manufactured.
Here, the step of filling the molten resin is performed while maintaining the distance between the movable plate and the fixed plate.

JP2012-40853A

In the technique of Patent Literature 1, the cavity is filled with the molten resin while maintaining the facing distance while the facing distance between the movable plate and the fixed plate is set to a predetermined facing distance in advance.
According to the inventor's study, in such a technique, due to voids remaining at the interface between the resin plates, the adhesion between the resin plates becomes poor, and the integrity of the final resin molded product is insufficient. There is a possibility.

  The present invention has been made in view of the above-described problems, and provides a method for producing a resin molded product and a resin molded product capable of easily obtaining good adhesion between resin plates laminated integrally with each other. A manufacturing apparatus is provided.

  According to the present invention, the first mold plate and the second mold plate are formed between the first mold plate and the second mold plate while gradually increasing the facing distance between the first mold plate and the second mold plate facing each other. A resin molded product that repeatedly performs a first step of filling a cavity with a molten resin and a second step of forming a resin plate by stopping the expansion of the facing interval and curing the resin filled in the cavity. A manufacturing method is provided.

  Further, according to the present invention, the first mold plate and the second mold plate that are arranged to face each other, and the interval change that changes the facing interval between the first mold plate and the second mold plate. A control mechanism for controlling a mechanism, a filling mechanism for filling a cavity formed between the first mold plate and the second mold plate with a molten resin, the interval changing mechanism and the filling mechanism; The control section includes a first process of filling the cavity with the molten resin by the filling mechanism while gradually increasing the facing distance by the spacing changing mechanism, and expanding the facing distance by the spacing changing mechanism. Is stopped, and the resin filled in the cavity is cured, and a second process of forming a resin plate is repeatedly performed.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to obtain easily the favorable adhesiveness of the resin plates laminated | stacked integrally mutually.

It is a figure which shows the whole structure of the manufacturing apparatus of the resin molded product which concerns on embodiment. It is a time chart for demonstrating the manufacturing method of the resin molded product which concerns on 1st Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 1st Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 1st Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 1st Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 1st Embodiment. It is a time chart for demonstrating the manufacturing method of the resin molded product which concerns on 2nd Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 2nd Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 2nd Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 2nd Embodiment. It is a time chart for demonstrating the manufacturing method of the resin molded product which concerns on 3rd Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 3rd Embodiment. It is process drawing for demonstrating the manufacturing method of the resin molded product which concerns on 3rd Embodiment. It is a figure which shows the whole structure of the manufacturing apparatus of the resin molded product which concerns on 4th Embodiment. It is a figure which shows the whole structure of the manufacturing apparatus of the resin molded product which concerns on 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[First Embodiment]
First, the first embodiment will be described with reference to FIGS.
A resin molded product manufacturing apparatus 100 according to the present embodiment (hereinafter may be simply referred to as a manufacturing apparatus 100) includes a first mold plate (for example, a fixed core 51) and a second mold that are arranged to face each other. An interval changing mechanism (for example, a drive motor 16, a drive shaft 17, a drive gear 18, and a drive) that changes a facing interval between a plate (for example, the plate portion 31 of the movable core 30) and the first mold plate and the second mold plate. Transmission chain 15, driven gear 14, rotation screw 13, rotation screw holding portion 12, female screw portion 33, slide portion 32, slide rail 20, and the like).
The manufacturing apparatus 100 further includes a filling mechanism (for example, an injection apparatus 70) that fills a cavity (such as the cavity 10a) formed between the first mold plate and the second mold plate with a molten resin, and an interval changing mechanism. And a control unit 80 for controlling the filling mechanism.
The controller 80 gradually increases the facing interval by the interval changing mechanism, and stops the expansion of the facing interval by the interval changing mechanism by stopping the first process of filling the cavity with the molten resin by the filling mechanism. The second process of curing the filled resin to form a resin plate (resin plates 2, 3, etc.) is repeatedly executed.

Hereinafter, the configuration of the manufacturing apparatus 100 will be described in detail.
As shown in FIG. 1, the manufacturing apparatus 100 includes a mold apparatus 10, an injection apparatus 70, a cooling and heating mechanism 90, and a control unit that controls operations of the mold apparatus 10, the injection apparatus 70, and the cooling and heating mechanism 90. 80.

  Among these, the mold apparatus 10 includes a fixed unit 50 that is connected to the injection apparatus 70 and is fixedly arranged, and a movable unit 40 that is movable relative to the fixed unit 50. ing.

  The movable unit 40 includes, for example, a plate-like base plate 11 and a holding frame portion 19 fixed to one surface side of the base plate 11. The holding frame portion 19 is formed in a cylindrical shape (for example, a square cylindrical shape) on the side far from the base plate 11. A part of the inner peripheral portion of the cylindrical portion of the holding frame portion 19 is constituted by a slide rail 20. The holding frame portion 19 holds the movable core 30 inside the cylindrical portion.

The movable core 30 has a cylindrical shape (for example, a rectangular tube shape) whose one end is closed by a plate-shaped plate portion 31. The movable core 30 is disposed coaxially with the cylindrical portion of the holding frame portion 19. The plate portion 31 of the movable core 30 is disposed orthogonal to the axial direction of the movable core 30 and is disposed to face the fixed core 51 of the fixed unit 50. The outer dimensions of the plate portion 31 are set to be approximately equal to the inner circumference of the cylindrical portion of the holding frame portion 19.
In the plate part 31, the surface facing the fixed core 51 may be formed flat. However, in order to realize a good anchoring property between the plate portion 31 and the resin, one or a plurality of bosses or recesses are formed on the surface of the plate portion 31 facing the fixed core 51, or the surface is roughened. It may be processed.

A slide portion 32 having an outer diameter equivalent to that of the plate portion 31 is formed on the outer peripheral portion of the movable core 30.
The movable core 30 can move in the axial direction of the movable core 30 (left and right direction in FIG. 1) relative to the holding frame portion 19. When the movable core 30 moves in the axial direction relative to the holding frame portion 19, the slide portion 32 is guided by the slide rail 20 of the holding frame portion 19, and the plate portion 31 is fixed to the holding frame portion 19. It slides against the inner peripheral surface of the cylindrical portion.
A female screw portion 33 is formed on the inner peripheral surface of the movable core 30.

The movable unit 40 further includes a rotating screw holding portion 12 provided on one surface side of the base plate 11 and a rotating screw 13 that is a male screw.
The rotating screw 13 is held by the rotating screw holding portion 12 so as to be rotatable around the axis of the rotating screw 13, and thereby can be rotated relative to the base plate 11.
The rotation screw 13 is disposed coaxially with the movable core 30, and the rotation screw 13 is screwed into the female screw portion 33 of the movable core 30.

  The movable unit 40 further includes a drive motor 16 for rotating the rotating screw 13 around the axis in one direction and in the opposite direction (forward rotation and reverse rotation). The drive motor 16 is arranged so that the drive shaft 17 of the drive motor 16 is parallel to the rotary screw 13. Specifically, for example, the drive motor 16 is fixed to the outer peripheral surface of the holding frame portion 19.

  The movable unit 40 further includes a drive gear 18 fixed around the drive shaft 17 coaxially with the drive shaft 17, a driven gear 14 fixed around the rotary screw 13 coaxially with the rotary screw 13, and driven And a drive transmission chain 15 that spans between the gear 14 and the drive gear 18.

  When the drive motor 16 rotates the drive shaft 17 in one direction (forward rotation), this rotation is transmitted to the rotation screw 13 via the drive gear 18, the drive transmission chain 15 and the driven gear 14, and the rotation screw 13 is Rotate in the direction (forward rotation). As the rotary screw 13 rotates forward, the movable core 30 moves relative to the holding frame portion 19 in a direction approaching the base plate 11 (left direction in FIG. 1). That is, since the plate portion 31 of the movable core 30 moves away from the fixed core 51 of the fixed unit 50, the facing interval between the fixed core 51 and the plate portion 31 gradually increases.

  Further, when the drive motor 16 rotates the drive shaft 17 in the opposite direction (reverse rotation), this rotation is transmitted to the rotation screw 13 via the drive gear 18, the drive transmission chain 15 and the driven gear 14, and the rotation screw 13. Rotates in the opposite direction (reverse rotation). As the rotary screw 13 rotates in the reverse direction, the movable core 30 moves relative to the holding frame portion 19 in a direction away from the base plate 11 (right direction in FIG. 1). That is, since the plate portion 31 of the movable core 30 moves in a direction approaching the fixed core 51 of the fixed unit 50, the facing interval between the fixed core 51 and the plate portion 31 is gradually reduced.

  In addition, the thickness dimension of the resin molded product 4 (FIG. 6) manufactured by the manufacturing apparatus 100 can be appropriately changed within the range of the movable amount (stroke) of the movable core 30. Although the magnitude | size of the stroke of the movable core 30 is not specifically limited, For example, it can be 40 mm or more, Preferably it can be set to about 60 mm.

  Here, the drive motor 16 is configured so that the rotation speed can be changed stepwise or steplessly. Therefore, the speed at which the interval between the fixed core 51 and the plate portion 31 is gradually increased can be set (selected) from a plurality of speeds. That is, the interval changing mechanism of the manufacturing apparatus 100 can change the facing interval at a speed set from a plurality of speeds.

  For example, the fixed unit 50 is formed in a disk shape and is disposed on the surface opposite to the plate portion 31 side of the fixed core 51 and the fixed core 51 disposed to face the holding frame portion 19 and the plate portion 31. And a plate-like fixed plate 52 that is fixed.

  Here, the end surface of the holding frame portion 19 on the fixed core 51 side and the end surface of the fixed core 51 on the holding frame portion 19 side are brought into close contact (that is, the mold apparatus 10 is clamped), and the fixed core 51 and the plate portion are fixed. By forming a gap with 31, the gap becomes a cavity. More specifically, the cavity is configured by a space surrounded by the fixed core 51, the plate portion 31, and the inner peripheral surface of the cylindrical portion of the holding frame portion 19.

In the fixed unit 50, for example, a resin flow path 53 that penetrates the fixed plate 52 and the fixed core 51 is formed. In addition, the front-end | tip part (end part by the side of the plate part 31) of the resin flow path 53 is diameter-reduced in the taper shape toward the front-end | tip side (plate part 31 side).
A molten resin injected from the injection device 70 (a molten resin discharged from a nozzle 74 described later) is introduced into the cavity of the mold apparatus 10 through the resin flow path 53.

The manufacturing apparatus 100 further moves a mold for moving the movable unit 40 of the mold apparatus 10 in a direction approaching the fixed unit 50 (right direction in FIG. 1) and a direction moving away from the fixed unit 50 (left direction in FIG. 1). A drive mechanism 60 is provided.
That is, the base plate 11, the rotating screw holding portion 12, the rotating screw 13, the driven gear 14, the drive transmission chain 15, the driving motor 16, the driving shaft 17, the driving gear 18, and the holding frame portion 19 (slide rail 20) constituting the movable unit 40. And the movable core 30 are integrally moved by the mold driving mechanism 60.
The configuration of the mold drive mechanism 60 is not particularly limited. For example, the mold drive mechanism 60 includes a cylinder device.

The manufacturing apparatus 100 further includes a cooling and heating mechanism 90 for individually cooling and heating the plate portion 31 and the fixed core 51.
Inside the plate part 31, there are a cooling flow path 34 that is a flow path of a heat medium (for example, a liquid such as water) for cooling the plate part 31, and a heat medium (for example, a heat medium for heating the plate part 31). , A heating flow path 35 that is a flow path of a liquid such as water.
Similarly, in the fixed core 51, a cooling flow path 54 that is a flow path of a heat medium (for example, a liquid such as water) for cooling the fixed core 51 and heat for heating the fixed core 51. A heating channel 55 that is a channel for a medium (for example, a liquid such as water) is formed.
As described above, the fixed core 51 is formed with the resin flow path 53 for filling the cavity with the molten resin, and the cooling flow path that is a flow path of the heat medium for cooling the fixed core 51. 54 and a heating flow path 55 that is a flow path of a heat medium for heating the first mold plate are formed. The cooling and heating mechanism 90 includes a cooling heat medium in the cooling flow path 34. , An operation of supplying a heating heat medium to the heating flow path 35, an operation of supplying a cooling heat medium to the cooling flow path 54, and a heating heat to the heating flow path 55. An operation of supplying a medium is possible.
The cooling and heating mechanism 90 supplies a cooling heat medium to the cooling flow path 34, whereby the molten resin that contacts the plate portion 31 can be quickly cooled and cured.
In addition, the cooling and heating mechanism 90 supplies a heating heat medium to the heating flow path 35, whereby the resin that contacts the plate portion 31 is quickly heated to raise the temperature to the softening point or higher (that is, the resin is heated). Softening).
Similarly, the cooling and heating mechanism 90 supplies a cooling heat medium to the cooling flow path 54, so that the molten resin that contacts the fixed core 51 can be quickly cooled and cured.
Further, the cooling and heating mechanism 90 supplies a heating heat medium to the heating channel 55 so that the resin in contact with the fixed core 51 is quickly heated to a temperature higher than the softening point (that is, the resin is heated). Softening).
That is, the manufacturing apparatus 100 includes a so-called heat and cool system.

The injection device 70 includes a cylindrical barrel 71, a hopper 72 for supplying resin pellets into the barrel 71, a screw 73 having a tip side portion accommodated in the barrel 71, and a barrel provided at the tip of the barrel 71. A nozzle 74 communicating with the inside of the 71, a screw advance / retreat mechanism 75 for moving the screw 73 in the axial direction of the screw 73 relative to the barrel 71, and a resin pellet or molten resin in the barrel 71 for the nozzle 74 And a screw rotation mechanism 76 that rotates the screw 73 about the axis in the direction of pushing out to the side. The screw advance / retreat mechanism 75 is configured by, for example, a cylinder device, and the screw rotation mechanism 76 is configured by, for example, a motor.
The opening at the tip of the nozzle 74 communicates directly or indirectly with the resin flow path 53.

The control unit 80 controls the operations of the screw advance / retreat mechanism 75, the screw rotation mechanism 76, the drive motor 16, the mold drive mechanism 60, and the cooling / heating mechanism 90, respectively.
The control unit 80 includes a ROM (Read Only Memory) that stores and holds a control program, and a screw advance / retreat mechanism 75, a screw rotation mechanism 76, a drive motor 16, a mold drive mechanism 60, and a cooling and heating mechanism according to the control program. A CPU (Central Processing Unit) that executes 90 control operations and a RAM (Random Access Memory) that functions as a work area of the CPU are configured.
The controller 80 may include a driver circuit for operating the screw advance / retreat mechanism 75, the screw rotation mechanism 76, the drive motor 16, the mold drive mechanism 60, and the like.

  The manufacturing apparatus 100 is configured as described above.

Next, a method for manufacturing a resin molded product according to this embodiment will be described.
In this manufacturing method, the first mold is gradually increased while the facing distance between the first mold plate (for example, the fixed core 51) and the second mold plate (for example, the plate portion 31 of the movable core 30) facing each other is gradually increased. A first step of filling the cavity (cavities 10a, 10b, etc.) formed between the plate and the second mold plate with the molten resin, and hardening the resin filled in the cavity by stopping the expansion of the opposing gap. And the second step of forming the resin plate (resin plates 2, 3, etc.) is repeated.
Thereby, the resin molded product 4 (FIG. 6) comprised by laminating | stacking and integrating a some resin board mutually can be formed.

  Here, a thermoplastic resin is used for molding the resin molded product 4. The type of thermoplastic resin is not particularly limited. For example, acrylonitrile butadiene styrene copolymer synthetic resin (ABS), polybutylene terephthalate (PBT), polycarbonate, acrylic, vinyl chloride, styrene, polypropylene, polyethylene terephthalate (PET), etc. are used. be able to.

For example, the resin materials constituting the resin plates of the respective layers constituting the resin molded product 4 may be the same or different from each other.
When molding a resin molded product 4 including a plurality of resin plates having different resin materials, for example, after purging the resin remaining in the barrel 71 of the injection apparatus 70, another type of resin material is used. Molding is performed. However, as the manufacturing apparatus 100, an apparatus including a plurality of lines of injection devices 70 may be used, and the injection device 70 for injecting the molten resin to the mold device 10 may be switched for each step of forming the resin plates of the respective layers. .

Hereinafter, the time chart of FIG. 2 and FIGS. 3 (a), 3 (b), 4 (a), 4 (b), 5 (a), 5 (b), and 6 (a) will be described. And the manufacturing method of the resin molded product which concerns on this embodiment is demonstrated in detail using the series of process drawing shown by FIG.6 (b).
This manufacturing method can be suitably performed by using the manufacturing apparatus 100 having the above-described configuration. The steps described below are performed by operating the drive motor 16, the mold drive mechanism 60, the screw advance / retreat mechanism 75, the screw rotation mechanism 76, and the cooling and heating mechanism 90 under the control of the control unit 80.

  In FIG. 2, the vertical axis represents the facing distance (mm) between the fixed core 51 and the plate portion 31, and may be simply referred to as the facing distance in the following description. The horizontal axis in FIG. 2 is time. FIG. 2 shows the flow of the time-series process and the change in the facing interval in each process, but the ratio of the interval (length) between the timings T10 to T17 shown on the horizontal axis is not necessarily the same. It does not indicate the exact time length ratio.

Here, as shown in FIG. 2, it is assumed that the facing interval is 0 mm in the initial state (timing T10). That is, the initial state is a state in which the plate portion 31 and the fixed core 51 are in contact with each other and there is substantially no cavity.
By rotating the drive motor 16 forward from the initial state, the facing distance between the plate portion 31 and the fixed core 51 is gradually increased, and the facing distance is formed first (first sheet) resin plate 2 (FIG. 4). The drive motor 16 is stopped at the timing (timing T12) at which the facing interval corresponding to the thickness (see (a)) is reached, thereby stopping the expansion of the facing interval.

Although the thickness of the resin plate 2 is not particularly limited, it can be set to 2 mm as an example. Therefore, the facing interval at the timing T12 can be set to 2 mm, for example.
The resin plate 2 may be a square having a side of 300 mm, for example, but the shape and dimensions of the resin plate 2 are not limited to this example.
The thickness of the resin plate 3 (FIG. 5B) formed by being laminated on the resin plate 2 can be equal to that of the resin plate 2, but is set to a thickness different from that of the resin plate 2. May be. The shape and dimensions of the resin plate 3 are the same as those of the resin plate 2.

  Here, in the process of gradually increasing the facing interval (between timing T10 and timing T12), the speed at which the facing interval is expanded, that is, the moving speed of the movable core 30 by the drive motor 16 can be constant. However, in the process of gradually increasing the facing distance, the speed at which the facing distance is expanded may be changed in the middle as necessary.

Then, in the process of gradually increasing the facing interval (between timing T10 and timing T12), the first step, that is, the facing interval is gradually increased from the time when the facing interval becomes a predetermined facing interval (timing T11). The process of filling the molten resin into the cavity formed between the fixed core 51 and the plate portion 31 (here, the cavity 10a whose thickness is defined by the plate portion 31 and the fixed core 51) is started.
That is, from the timing (timing T11) when the state of FIG. 3A is reached, filling of the molten resin into the cavity 10a is started as shown in FIG. 3B.
Here, the predetermined interval is any one of intermediate intervals between the minimum and maximum counter intervals in the process of gradually increasing the counter interval (between timing T10 and timing T12). Here, as an example, the predetermined facing interval is 1 mm, which is half the thickness of the resin plate 2. That is, the first step is started from the timing T11 when the facing interval is 1 mm.
Here, before the start of the first step, the resin pellets charged in the hopper 72 of the injection device 70 are melted while being kneaded by the screw 73 rotating in the barrel 71 and sent to the tip end side of the barrel 71. Thus, it is assumed that the molten resin is stored in the liquid reservoir at the tip of the barrel 71 (in front of the screw 73).
Then, in a state where the molten resin is stored in the liquid reservoir at the tip of the barrel 71, the screw advance / retreat mechanism 75 advances the screw 73, so that the molten resin in the liquid reservoir passes through the nozzle 74 and the resin flow path 53. The cavity 10a is filled. In other words, in the first step, the cavity 10 a is filled with the molten resin through the resin flow path 53 formed in the fixed core 51.
At timing T12, the advancement of the screw 73 by the screw advance / retreat mechanism 75 is stopped in synchronization with the end of the process of gradually increasing the facing interval, thereby stopping the filling of the molten resin into the cavity 10a (FIG. 4). (A)).
The plate portion 31 is not separated from the fixed core 51 only by the pressure of the molten resin supplied to the mold apparatus 10 by the injection apparatus 70, and is synchronized with the molten resin being supplied to the mold apparatus 10 by the injection apparatus 70. Then, the plate portion 31 is moved away from the fixed core 51 by the plate motor 31 being moved away from the fixed core 51 by the drive motor 16. That is, the facing distance is not enlarged by the resin pressure.

  Next, a cooling heat medium is supplied from the cooling and heating mechanism 90 to the cooling flow path 34 of the plate portion 31 and the cooling flow path 54 of the fixed core 51, and the heat medium is supplied to the cooling flow path 34 and the cooling flow path. The plate portion 31 and the fixed core 51 are cooled by flowing through the paths 54 (between timing T12 and timing T13). As a result, the resin 1 in the cavity 10a is cooled and cured to form the resin plate 2 (FIG. 4A) (second step).

  Thus, since the filling of the molten resin into the cavity 10a is started from a state where the facing interval is smaller than the thickness of the resin plate 2, the molten resin quickly spreads over the entire area of the cavity 10a, and the molten resin in the cavity 10a and the plate Residual voids at the interface with the portion 31 can be suppressed. Therefore, good adhesion between the resin 1 in the cavity 10a and the plate portion 31 can be realized. Then, in order to continue the filling of the molten resin into the cavity 10a while gradually expanding the cavity 10a, a resin having a required thickness while maintaining good adhesion between the resin 1 in the cavity 10a and the plate portion 31. A plate 2 can be formed.

Next, as a preliminary process for the next injection, a heating heat medium is supplied from the cooling and heating mechanism 90 to the cooling flow path 54 of the fixed core 51, and the heat medium is circulated in the cooling flow path 54, thereby fixing. The core 51 is heated. This softens the resin 1 in the resin flow path 53 and the contact portion between the resin 1 in the cavity 10a (that is, the resin plate 2) and the fixed core 51 (between timing T13 and timing T14). Here, the resin 1 in the resin flow path 53 and the contact portion of the resin 1 in the cavity 10a with the fixed core 51 may be melted.
It should be noted that the facing interval is kept constant (for example, 2 mm) from timing T12 to timing T14.

Next, again, the drive motor 16 is rotated forward to gradually increase the facing distance between the plate portion 31 and the fixed core 51, and the facing distance is molded a second time (second sheet). By stopping the drive motor 16 at the timing (timing T16) at which the facing interval corresponding to the thickness (see FIG. 5B) is reached, the expansion of the facing interval is stopped. At this time, since the resin plate 2 is in close contact with the plate portion 31, the resin plate 2 is gradually separated from the fixed core 51 along with the plate portion 31.
As an example, the thickness of the resin plate 3 can also be 2 mm. Therefore, the facing interval at the timing T16 can be 4 mm, for example (the facing interval between the resin plate 2 and the fixed core 51 is 2 mm).
Here, the speed at which the facing interval is enlarged can be set to a constant speed, for example, but the speed at which the facing interval is enlarged may be changed in the middle as necessary.

Then, in the process of gradually increasing the facing interval (between timing T14 and timing T16), the first step, that is, the facing interval is gradually increased again from the time when the facing interval becomes a predetermined facing interval (timing T15). A process of filling a molten resin into a cavity (here, a cavity 10b whose thickness is defined by the resin plate 2 and the fixed core 51) formed between the fixed core 51 and the plate portion 31 is started while expanding.
That is, from the timing (timing T15) at which the state shown in FIG. 4B is reached, filling of the molten resin into the cavity 10b is started as shown in FIG. 5A.
Here, the predetermined interval is any one of the intermediate intervals between the minimum and maximum opposing intervals in the process of gradually increasing the opposing interval (between timing T14 and timing T16). Here, as an example, the predetermined facing interval is assumed to be 3 mm, which is a thickness obtained by adding the thickness of the resin plate 2 and half the thickness of the resin plate 3 together. That is, the second first process is started from the timing T15 when the facing interval becomes 3 mm.
Even in the second step of the second time, the molten resin previously stored in the liquid reservoir at the tip of the barrel 71 of the injection device 70 is moved through the resin flow path 53 by the forward movement of the screw 73 by the screw advance / retreat mechanism 75. 10b.
Then, at timing T16, in synchronism with the end of the process of gradually increasing the facing distance, the advancement of the screw 73 by the screw advance / retreat mechanism 75 is stopped to stop the filling of the molten resin into the cavity 10b (FIG. 5). (B)).
In addition, after the 1st process of the 1st time and before the start of the 2nd process of the 2nd time, the screw 73 is retracted in advance, and the molten resin is stored in the liquid reservoir at the tip of the barrel 71. To do.

Next, a cooling heat medium is supplied from the cooling and heating mechanism 90 to the cooling flow path 34 of the plate portion 31 and the cooling flow path 54 of the fixed core 51, and the heat medium is supplied to the cooling flow path 34 and the cooling flow path. The plate portion 31 and the fixed core 51 are cooled by flowing through the paths 54 (between timing T16 and timing T17). Thereby, the resin 1 in the cavity 10b is cooled and cured, and the resin plate 3 is formed integrally with the resin plate 2 (FIG. 5B) (second second step).
In this way, the resin molded product 4 configured by laminating the resin plate 2 and the resin plate 3 is obtained. The resin molded product 4 is configured by laminating and integrating a plurality of flat resin plates.

Thereafter, the mold opening mechanism is opened as shown in FIG. 6A by moving the movable unit 40 in the direction away from the fixed core 51 by the mold driving mechanism 60.
Next, by rotating the drive motor 16 in the reverse direction and moving the plate portion 31 to the fixed core 51 side, the resin molded product 4 can be taken out from the mold apparatus 10 as shown in FIG.

  Thus, since the filling of the molten resin into the cavity 10b is started from a state in which the facing interval is smaller than the sum of the thickness of the resin plate 2 and the thickness of the resin plate 3, the molten resin is spread over the entire area of the cavity 10b. It is possible to spread quickly and suppress the voids remaining at the interface between the resin plate 2 and the molten resin in the cavity 10b. Therefore, good adhesion between the resin 1 and the resin plate 2 in the cavity 10b can be realized. Then, in order to continue the filling of the molten resin into the cavity 10b while gradually expanding the cavity 10b, a resin having a necessary thickness while maintaining good adhesion between the resin 1 and the resin plate 2 in the cavity 10b. A plate 3 can be formed.

In this embodiment, following the second step, the fixing core 51 is heated to fix the resin 1 in the resin flow channel 53 and the resin 1 (resin plate 2) in the cavity (for example, the cavity 10a). The step of softening the contact portion with the core 51 is performed, and the first step is performed again following the softening step.
Thus, after the resin plate 2 is formed, the resin plate 3 can be continuously laminated on the resin plate 2 without opening the mold. In addition, good adhesion between the resin plate 2 and the resin plate 3 formed by being laminated on the resin plate 2 later is obtained.

  In the above description, in order to simplify the process, the first process and the second process are repeated twice to form the resin molded product 4 in which the resin plate 2 and the resin plate 3 are laminated. However, the number of times of repeatedly performing the first step and the second step, that is, the number of resin plate layers of the resin molded product 4 may be three or more.

Further, as described above, the speed at which the facing interval is gradually enlarged can be set (selected) from a plurality of speeds. This speed is preferably set according to the type of resin used for molding.
That is, the method for manufacturing a resin molded product according to the present embodiment further includes a step of setting a speed at which the facing interval is gradually enlarged according to the type of resin to be used from among a plurality of speeds. Then, it is preferable to gradually expand the facing interval at a set speed.
By doing in this way, according to properties, such as a viscosity which changes with each resin, an opposing space | interval can be changed at an appropriate speed.
More specifically, for example, a first molding step of molding the resin molded product 4 using the first resin having the first viscosity, and a resin using the second resin having the second viscosity higher than the first viscosity. When performing the 2nd shaping | molding process which shape | molds the molded article 4, the speed which expands an opposing space | interval in a 2nd shaping | molding process can be set smaller than the speed which expands an opposing space | interval in a 1st shaping | molding process.

In the manufacturing method of the resin molded product according to the first embodiment described above, the gap is formed between the fixed core 51 and the plate portion 31 while gradually increasing the facing distance between the fixed core 51 and the plate portion 31 facing each other. A first step of filling the cavities (cavities 10a, 10b) with the molten resin, and forming resin plates (resin plates 2, 3) by curing the resin filled in the cavities by stopping the expansion of the facing distance And the second step is repeated.
That is, since the filling of the molten resin into the cavity is started from the state where the thickness of the cavity is smaller than the thickness of the resin plate formed in the second step, the molten resin can be quickly spread over the entire cavity.
As a result, it is possible to suppress voids remaining at the interface between the molten resin filled in the cavity and the mold, and voids remaining at the interface between the previously formed resin plate and the newly filled molten resin. Good adhesion between the resin plate and the mold and good adhesion between the resin plates can be obtained.
Therefore, it is possible to easily obtain good adhesion between resin plates laminated integrally with each other.

[Second Embodiment]
Next, a second embodiment will be described.
The manufacturing apparatus 100 according to the present embodiment also has the configuration shown in FIG. The manufacturing apparatus 100 according to the present embodiment is partly similar to the manufacturing apparatus 100 according to the first embodiment except that a part of the control operation by the control unit 80 is different from that of the first embodiment. Has been.
In addition, the method for manufacturing a resin molded product according to the present embodiment is different from the method for manufacturing a resin molded product according to the first embodiment in the points described below. It is comprised similarly to the manufacturing method of the resin molded product which concerns on this embodiment.

  Hereinafter, the present embodiment will be described using the time chart of FIG. 7 and a series of process diagrams shown in FIGS. 8A, 8B, 9A, 9B, and 10. A method for producing a resin molded product according to the present invention will be described.

In the case of the present embodiment, first, in a state where the facing interval is 0 mm (a state where the plate portion 31 and the fixed core 51 are in contact), the molten resin reaches the plate portion 31 and the plate portion 31 is pressed by the molten resin. Then, a step of increasing the pressure of the molten resin in the resin flow path 53 (step from timing T20 to timing T21) is performed (see FIG. 8A).
In this step, for example, from the state where the molten resin is stored in the liquid reservoir at the tip of the barrel 71, the molten resin in the liquid reservoir is filled into the resin flow path 53 via the nozzle 74, and the resin flow path 53 The screw advance / retreat mechanism 75 can advance the screw 73 slightly until the molten resin inside is pressurized.

Then, following the step of causing the molten resin to reach the plate portion 31 and pressing the plate portion 31 with the molten resin, the first step, that is, the step of filling the cavity 10a with the molten resin while gradually increasing the facing interval ( Steps from timing T21 to timing T22) are started. For this reason, exhaust from the cavity 10a is not necessary, and filling of the molten resin into the cavity 10a (see FIG. 8B) can be performed more quickly.
In the case of the present embodiment, as shown in FIG. 7, the filling of the molten resin into the cavity 10a is 2 mm, which is the interval corresponding to the thickness of the resin plate 2, from the timing when the interval is 0 mm. Do until. And at the timing (timing T22) when the said opposing space | interval became 2 mm, while expanding the opposing space | interval by stopping the drive motor 16, filling of the molten resin to the cavity 10a is stopped.

Next, by cooling the plate portion 31 and the fixed core 51 as in the first embodiment, the second step (between timing T22 and timing T23) is performed to form the resin plate 2 (FIG. 9 ( a)).
Further, as in the first embodiment, as a preliminary process for the next injection, by heating the fixed core 51, the resin 1 in the resin flow path 53 and the fixed core 51 in the resin plate 2 in the cavity 10a Are softened (between timing T23 and timing T24).

Next, in a state where the facing distance between the resin plate 2 and the fixed core 51 is 0 mm (a state in which the resin plate 2 and the fixed core 51 are in contact), the molten resin reaches the resin plate 2 and the resin plate is used by the molten resin. The step of pressing 2 and increasing the pressure of the molten resin in the resin flow path 53 (step from timing T24 to timing T25) is performed before the second first step.
Also in this step, for example, from the state where the molten resin is stored in the liquid reservoir at the tip of the barrel 71, the molten resin in the liquid reservoir is filled into the resin flow path 53 via the nozzle 74, and the resin flow path 53 The screw advance / retreat mechanism 75 can advance the screw 73 slightly until the molten resin inside is pressurized.
It should be noted that the facing interval is kept constant (for example, 2 mm) from timing T22 to timing T25.

Then, following the step of causing the molten resin to reach the resin plate 2 and pressing the resin plate 2 with the molten resin, the first step of the second time, that is, filling the cavity 10b with the molten resin while gradually increasing the facing interval The process (process from timing T25 to timing T26) is started. For this reason, exhaust from the cavity 10b is unnecessary, and filling of the molten resin into the cavity 10b (see FIG. 9B) can be performed more quickly.
In the case of the present embodiment, as shown in FIG. 7, the filling of the molten resin into the cavity 10 b is performed by adding the thickness of the resin plate 2 and the thickness of the resin plate 3 from the timing when the facing interval is 2 mm. This is performed until the distance corresponding to the thickness is 4 mm. And at the timing (timing T26) when the said opposing space | interval became 4 mm, while expanding the opposing space | interval by stopping the drive motor 16, filling of the molten resin to the cavity 10b is stopped.

Next, by cooling the plate portion 31 and the fixed core 51 in the same manner as in the first embodiment, a second second step (between timing T26 and timing T27) is performed, and the resin plate 2 is laminated. The formed resin plate 3 is formed (FIG. 10).
Further, the mold is opened as in the first embodiment (see FIG. 6A), and the resin molded product 4 is taken out from the mold apparatus 10 by moving the plate portion 31 to the fixed core 51 side (FIG. 6 ( b)).
In the present embodiment, the number of times that the first step and the second step are repeatedly performed, that is, the number of resin plate layers of the resin molded product 4 may be three or more.

  According to the second embodiment as described above, the same effect as that of the first embodiment can be obtained.

  Further, in the present embodiment, the resin plate formed in the previous second step (for example, formed in the first second step) before the first step (for example, the second first step) after the second time. A step of causing the molten resin to reach the resin plate 2) and pressing the resin plate with the molten resin is provided, and the first step after the second time is started following the pressing step. For this reason, exhaust from the cavity (for example, the cavity 10b) is not necessary, and the molten resin can be filled into the cavity more quickly.

[Third Embodiment]
Next, a third embodiment will be described.
The manufacturing apparatus 100 according to the present embodiment also has the configuration shown in FIG. The manufacturing apparatus 100 according to the present embodiment is partly similar to the manufacturing apparatus 100 according to the first embodiment except that a part of the control operation by the control unit 80 is different from that of the first embodiment. Has been.
In addition, the method for manufacturing a resin molded product according to the present embodiment is different from the method for manufacturing a resin molded product according to the first embodiment in the points described below. It is comprised similarly to the manufacturing method of the resin molded product which concerns on this embodiment.

  Hereinafter, the resin according to this embodiment will be described with reference to the time chart of FIG. 11 and a series of process diagrams shown in FIGS. 12 (a), 12 (b), 13 (a), and 13 (b). A method for manufacturing a molded product will be described.

  In the present embodiment, first, similarly to the process from timing T10 to timing T13 in the first embodiment (see FIG. 2 and the like), the process from timing T30 to timing T31, timing T32, and timing T33 (FIG. 13) is performed. Do. That is, the processes until the resin plate 2 is formed are the same as those in the first embodiment.

  Thereafter, by moving the movable unit 40 in a direction away from the fixed core 51 by the mold driving mechanism 60 (by performing the steps from timing T33 to timing T34), as shown in FIG. Open the mold.

Then, the resin 1 in the resin flow path 53 is removed. That is, following the previous second step, the resin in the resin flow path 53 is removed with the fixed core 51 and the plate portion 31 open (FIG. 12B). When a runner (not shown) formed integrally with the resin (resin plate 2) in the cavity 10a exists, the runner is removed from the resin plate 2.
That is, the resin that hinders the filling of the molten resin in the next first step is removed (steps from timing T34 to timing T35).

  Next, the mold drive mechanism 60 moves the movable unit 40 in a direction approaching the fixed core 51 (by performing the steps from timing T35 to timing T36), and then the mold clamping is performed again (FIG. 13A). ).

Thereafter, similarly to the process from timing T14 to timing T17 in the first embodiment (see FIG. 2 and the like), the process from timing T36 to timing T37, timing T38, and timing T39 (FIG. 13) is performed. Thus, the resin plate 3 is laminated on the resin plate 2 (see FIG. 5B).
Here, immediately before starting the filling of the molten resin into the cavity 10b in the second first step, as shown in FIG. 13B, the resin flow path 53 is hardened to prevent the molten resin from flowing. Since there is no resin, filling of the molten resin into the cavity 10b can be performed smoothly.

Thus, in the present embodiment, following the second step, the resin in the resin flow path 53 or the resin in the cavity 10a (with the mold open) with the fixed core 51 and the plate portion 31 opened (in the mold open state) The step of removing the runner formed integrally with the resin plate 2) and the step of closing the fixed core 51 and the plate portion 31 again are performed, and then the step of closing the fixed core 51 and the plate portion 31 is performed again. One step is performed.
For this reason, as a preliminary injection process, a process of heating the fixed core 51 by supplying a heating medium from the cooling and heating mechanism 90 to the heating channel 55 of the fixed core 51 can be eliminated. The manufacturing apparatus 100 may not have the heating flow path 55. However, in the case of this embodiment as well, the fixed core 51 may be heated by supplying a heating heat medium to the heating channel 55 in any of the steps as necessary.

[Fourth Embodiment]
FIG. 14 is a diagram illustrating an overall configuration of a manufacturing apparatus 100 according to the fourth embodiment.
The manufacturing apparatus 100 according to the present embodiment is different from the manufacturing apparatus (see FIG. 1) of the first embodiment in that it includes a hydraulic unit 56 and a rod portion 57. In FIG. 14, for convenience, the cooling flow path 34, the heating flow path 35, the cooling flow path 54, and the heating flow path 55 (see FIG. 1) are not shown.

  In the manufacturing apparatus 100 of the present embodiment, the first mold plate (fixed core 51) is an extruding part that projects into the cavities 10a and 10b toward the second mold plate (plate part 31 of the movable core 30). It differs from the first embodiment in that it has (rod portion 57). The rod portion 57 is driven forward and backward by the hydraulic unit 56. A specific structure and arrangement of the extruding part are not particularly limited as long as the extruding part urges the resin plates 2 and 3 toward the plate part 31 at a desired timing. In the present embodiment, the rod portion 57 driven by the hydraulic unit 56 is illustrated, but the present invention is not limited to this. For example, the rod portion 57 may be screw-driven so as to advance and retreat by a motor.

  When the rod portion 57 is moved backward, the tip of the rod portion 57 (the left end in FIG. 14) is flush with the inner surface of the fixed core 51 (the surface facing the plate portion 31). When the rod part 57 is operated to protrude, the tip of the rod part 57 protrudes into the cavities 10a and 10b. Thereby, the cured resin plates 2 and 3 can be peeled from the fixed core 51 and pressed toward the plate portion 31.

  The hydraulic unit 56 is signal-connected to the control unit 80, and receives a drive signal for driving the rod unit 57 to move forward and backward, thereby causing the rod unit 57 to project or retract. The rod portion 57 is provided at a plurality of locations of the fixed core 51 so as to surround the resin flow path 53. When the plan view shape of the cavity 10a, that is, the shape of the cavity 10a viewed in the retreating direction of the movable core 30, is a rectangle, the rod portion 57 may be disposed in the vicinity of the four corners of the rectangle.

  A method for manufacturing a resin molded product according to this embodiment will be described. The manufacturing method of this embodiment can be performed according to the time charts shown in FIGS.

  This manufacturing method includes a peeling step in which the resin plates 2 and 3 cooled and cured in the second step are peeled off from the first mold plate (fixed core 51). The peeling step is performed by extruding the resin plates 2 and 3 by the extrusion part (rod part 57) from the first mold plate (fixed core 51) toward the second mold plate (plate part 31 of the movable core 30). . And the 1st process after the 2nd time is started after a peeling process. Before performing the next filling process performed after the peeling process, the rod part 57 is driven backward to retract the tip of the rod part 57 until it is flush with the fixed core 51.

  More specifically, from the timing T13 (see FIG. 2), T23 (see FIG. 7) or T33 (see FIG. 11) at which the resin 1 in the cavities 10a and 10b is cooled and cured and the resin plates 2 and 3 are molded, The above-described peeling process is performed until the interval between the fixed core 51 and the plate portion 31 is increased (that is, the interval is expanded or the mold is opened). Therefore, specifically, the peeling process is performed between timings T13 and T14 (see FIG. 2), between timings T23 and T25 (see FIG. 7), or between timings T33 and T36 (see FIG. 11).

  Like the manufacturing method according to the present embodiment, the cooled and cured resin plates 2 and 3 are peeled off from the fixed core 51 before the next filling step, so that the movable core 30 can be smoothly retracted in the next filling step. Thus, the cavities 10a and 10b can be formed. Further, when the boss described above is formed on the plate portion 31 to be anchored to the resin plates 2 and 3, the resin plates 2 and 3 are pressed against the plate portion 31 by the rod portion 57 and peeled as in the present embodiment. Thus, it is possible to prevent the resin plates 2 and 3 from being detached from the boss when the plate portion 31 is retracted.

[Fifth Embodiment]
FIG. 15 is a diagram illustrating an overall configuration of a manufacturing apparatus 100 according to the fifth embodiment.
The manufacturing apparatus 100 according to the present embodiment is different from the manufacturing apparatus of the first embodiment (see FIG. 1) in that the pressurizing unit 58 is provided.

  The manufacturing apparatus 100 of the present embodiment includes a pressurizing unit 58 that pressurizes the peripheral walls (holding frame portions 19) of the cavities 10a and 10b inward. The pressurizing portion 58 applies an inward pressing force to the peripheral wall (holding frame portion 19) from four directions. The control unit 80 pressurizes the pressurizing unit 58 in conjunction with the timing when the filling mechanism (injection device 70) fills the cavities 10a and 10b with the molten resin. The holding frame portion 19 is a peripheral wall that surrounds the movable core 30 and the cavity 10a from the periphery. The pressurizing portion 58 is signal-connected to the mold drive mechanism 60 and pressurizes the holding frame portion 19 inward at a predetermined timing or reduces the pressurizing as indicated by white arrows in FIG. Thus, the holding frame portion 19 is allowed to move outward. More specifically, the pressurizing unit 58 maintains the cavity 10a in a predetermined outer shape against the injection pressure of the injection device 70, and at least in the cooling process for cooling and hardening the resin 1 in the cavity 10a. The portion 19 is pressurized inward. A known pressurizing mechanism can be used for the pressurizing unit 58. As an example, the pressurizing portion 58 includes a pressing mechanism that mechanically presses the holding frame portion 19 toward the inside of the cavities 10a and 10b.

  A method for manufacturing a resin molded product according to this embodiment will be described. The manufacturing method of this embodiment can be performed according to the time charts shown in FIGS.

  In this manufacturing method, the second step is performed in a state where the peripheral walls (holding frame portions 19) of the cavities 10a and 10b are pressurized inward. The second and subsequent first steps start with the pressure applied to the peripheral wall (holding frame portion 19) reduced, and the molten resin supplied to the cavities 10a and 10b in the first step is the peripheral wall (holding frame). Pressurization is performed before reaching part 19). Here, reducing the pressurization includes not only a mode in which a part of the inward pressurization is removed and reduced, but also a mode in which the pressurization is completely eliminated, or conversely, the holding frame portion 19 is reduced to a negative pressure. A mode of biasing outward is included. In this way, by performing the first half of the first step of expanding the interval between the fixed core 51 and the plate portion 31 in a reduced pressure state with reduced pressurization, the resin plate 2 that has been cooled and cured in the previous second step, 3 can be easily peeled off from the holding frame 19. Then, by applying pressure before the molten resin reaches the holding frame portion 19 in the subsequent first step, the molten resin can be prevented from entering the gap between the holding frame portion 19 and the movable core 30, and desired. The resin plates 2 and 3 having the outer dimensions can be formed.

  More specifically, the mold drive mechanism 60 drives the pressurizing unit 58 in response to a control signal from the control unit 80. When based on the time chart in FIG. 2, the pressurizing unit 58 may perform the pressure reduction state at the timings T <b> 14 to T <b> 15 and perform the pressures at the timings T <b> 15 to T <b> 17. Moreover, when based on the time chart of FIG. 7, it is good for the pressurization part 58 to make a time T23-T25 into a pressure reduction state, and perform timing T25-T27 in a pressure state. And based on the time chart of FIG. 11, it is good for the pressurization part 58 to make a timing T33-T37 into a pressure reduction state, and perform timing T37-T39 in a pressurization state. Note that switching between the reduced pressure state and the pressurized state is performed during the molten resin filling process, that is, when the timing T15 is slightly past (and before the timing T16 in FIG. 2), and slightly at the timing T25 in FIG. In FIG. 11, it is good also as the time (and before timing T38) which passed the timing T37 slightly in FIG.

  As mentioned above, although each embodiment was described with reference to drawings, these are illustrations of the present invention, and various configurations other than the above can also be adopted. Moreover, each said embodiment can be combined suitably in the range which does not deviate from the main point of this invention. For example, you may provide both the hydraulic unit 56 and the rod part 57 of 4th Embodiment shown in FIG. 14, and the pressurization part 58 of 5th Embodiment shown in FIG.

This embodiment includes the following technical ideas.
(1) In a cavity formed between the first mold plate and the second mold plate while gradually increasing the facing distance between the first mold plate and the second mold plate facing each other. A method for producing a resin molded article, comprising repeatedly performing a first step of filling a molten resin and a second step of forming a resin plate by curing the resin filled in the cavity by stopping the expansion of the facing interval.
(2) The method for manufacturing a resin molded product according to (1), wherein the first step is started when the facing interval becomes a predetermined facing interval in the process of gradually increasing the facing interval.
(3) Before the first step after the second time, the step of causing the molten resin to reach the resin plate formed in the previous second step and pressing the resin plate with the molten resin, The method for producing a resin molded product according to (1), wherein the first step after the second step is started following the pressing step.
(4) In the first step, the cavity is filled with a molten resin via a resin flow path formed in the first mold plate, and the first mold is followed by the second step. By heating the plate, the step of softening the resin in the resin flow path and the contact portion of the resin in the cavity with the first mold plate is performed. Following the softening step, again, The method for producing a resin molded product according to any one of (1) to (3), wherein the first step is performed.
(5) In the first step, the cavity is filled with a molten resin through a resin flow path formed in the first mold plate, and the first mold is followed by the second step. Removing the runner formed integrally with the resin in the resin flow path or the resin in the cavity in a state where the plate and the second mold plate are opened; and again, the first mold plate and the first mold plate (2) closing the two mold plates, and following the step of closing the first mold plate and the second mold plate, the first step is performed again. A method for producing a resin molded product according to claim 1.
(6) The method further includes a step of setting a speed at which the facing interval is gradually increased according to the type of resin to be used from a plurality of speeds. In the first step, the facing interval is set at a set speed. The method for producing a resin molded product according to any one of (1) to (5), wherein the step is gradually expanded.
(7) a first mold plate and a second mold plate that are arranged to face each other, an interval changing mechanism that changes an opposing interval between the first mold plate and the second mold plate, and the first A control mechanism that controls a filling mechanism that fills a cavity formed between one mold plate and the second mold plate with a molten resin; and a control unit that controls the interval changing mechanism and the filling mechanism. The portion stops the expansion of the facing interval by the first changing process by the first changing process by filling the cavity with the filling mechanism by the filling mechanism while gradually increasing the facing interval by the spacing changing mechanism, An apparatus for manufacturing a resin molded product, which repeatedly executes a second process of forming a resin plate by curing the resin filled in the cavity.
(8) The apparatus for manufacturing a resin molded product according to (7), wherein the interval changing mechanism can change the facing interval at a speed set from a plurality of speeds.
(9) The first mold plate is provided with a resin flow path for filling the cavity with a molten resin, and a heat medium flow path for cooling the first mold plate. The manufacturing of the resin molded product according to (7) or (8), wherein a cooling flow path and a heating flow path that is a flow path of a heat medium for heating the first mold plate are formed. apparatus.

Moreover, said embodiment further includes the following technical thoughts.
(10) Peeling that exfoliates the resin plate from the first mold plate by extruding the resin plate cured in the second step from the first mold plate toward the second mold plate at an extrusion portion. The manufacturing method of said resin molded product which further includes a process and starts the said 1st process after the said peeling process after the 2nd time.
(11) The second step is performed in a state in which the peripheral wall of the cavity is pressurized inward, and the first step after the second time starts with the pressure applied to the peripheral wall being reduced, and The method for manufacturing a resin molded product according to the first aspect, wherein the pressurizing is performed before the molten resin supplied to the cavity in the first step reaches the peripheral wall.
(12) The apparatus for manufacturing a resin molded product, wherein the first mold plate has an extruding portion that projects into the cavity toward the second mold plate.
(13) A pressurizing unit that pressurizes the peripheral wall of the cavity inward, and the control unit pressurizes the pressurizing unit in conjunction with a timing when the filling mechanism fills the cavity with the molten resin. An apparatus for manufacturing the above-mentioned resin molded product.

DESCRIPTION OF SYMBOLS 1 Resin 2, 3 Resin plate 4 Resin molded product 10 Mold apparatus 10a Cavity 10b Cavity 11 Base plate 12 Rotating screw holding part (interval changing mechanism)
13 Rotating screw (interval changing mechanism)
14 Driven gear (interval change mechanism)
15 Drive transmission chain (interval change mechanism)
16 Drive motor (interval change mechanism)
17 Drive shaft (interval change mechanism)
18 Drive gear (interval change mechanism)
19 Holding frame (spacing change mechanism, peripheral wall)
20 Slide rail (interval changing mechanism)
30 Movable core 31 Plate part (second mold plate)
32 Slide part (interval change mechanism)
33 Female thread (interval change mechanism)
34 Cooling channel 35 Heating channel 40 Movable unit 50 Fixed unit 51 Fixed core (first mold plate)
52 Fixed Plate 53 Resin Channel 54 Cooling Channel 55 Heating Channel 56 Hydraulic Unit 57 Rod Part (Extrusion Unit)
58 Pressurizing unit 60 Mold drive mechanism 70 Injection device (filling mechanism)
71 Barrel 72 Hopper 73 Screw 74 Nozzle 75 Screw advance / retreat mechanism 76 Screw rotation mechanism 80 Control unit 90 Cooling / heating mechanism 100 Resin molded product manufacturing apparatus

Claims (13)

Molten resin is poured into the cavity formed between the first mold plate and the second mold plate while gradually increasing the facing distance between the first mold plate and the second mold plate facing each other. A first step of filling;
A second step of forming a resin plate by stopping the expansion of the facing interval and curing the resin filled in the cavity;
A process for producing a resin molded product which is repeatedly performed.   The method of manufacturing a resin molded product according to claim 1, wherein the first step is started when the facing interval becomes a predetermined facing interval in the process of gradually increasing the facing interval.   Before the first step after the second time, a step of causing the molten resin to reach the resin plate formed in the previous second step and pressing the resin plate with the molten resin, the step of pressing The manufacturing method of the resin molded product of Claim 1 which starts the said 1st process after the 2nd time continuously.   A peeling step of peeling the resin plate from the first mold plate by extruding the resin plate cured in the second step from the first mold plate toward the second mold plate by an extrusion unit; The manufacturing method of the resin molded product as described in any one of Claim 1 to 3 which starts and the said 1st process after the 2nd time is started after the said peeling process. The second step is performed in a state in which the peripheral wall of the cavity is pressurized inwardly,
The first step after the second time starts with the pressure applied to the peripheral wall being reduced, and before the molten resin supplied to the cavity in the first step reaches the peripheral wall. The method for producing a resin molded product according to any one of claims 1 to 4, wherein pressure is applied. In the first step, the cavity is filled with a molten resin through a resin flow path formed in the first mold plate,
Subsequent to the second step, the first mold plate is heated to soften the resin in the resin flow path and the contact portion of the resin in the cavity with the first mold plate. Perform the process,
The method for producing a resin molded product according to any one of claims 1 to 5, wherein the first step is performed again after the softening step. In the first step, the cavity is filled with a molten resin through a resin flow path formed in the first mold plate,
Following the second step,
Removing the runner integrally formed with the resin in the resin flow path or the resin in the cavity with the first mold plate and the second mold plate open;
Closing the first mold plate and the second mold plate again;
And
The method for producing a resin molded product according to any one of claims 1 to 5, wherein the first step is performed again after the step of closing the first mold plate and the second mold plate. Further comprising a step of setting the speed at which the facing interval is gradually expanded, from a plurality of speeds, according to the type of resin used;
In the said 1st process, the said opposing space | interval is gradually expanded at the set speed | rate, The manufacturing method of the resin molded product as described in any one of Claim 1 to 7. A first mold plate and a second mold plate disposed to face each other;
An interval changing mechanism for changing an opposing interval between the first mold plate and the second mold plate;
A filling mechanism for filling a cavity formed between the first mold plate and the second mold plate with a molten resin;
A controller for controlling the interval changing mechanism and the filling mechanism;
With
The controller is
A first process of filling the cavity with the molten resin by the filling mechanism while gradually increasing the facing interval by the interval changing mechanism;
A second process of stopping the expansion of the opposing interval by the interval changing mechanism and curing the resin filled in the cavity to form a resin plate;
A resin molded product manufacturing device that repeatedly executes   The apparatus for manufacturing a resin molded product according to claim 9, wherein the interval changing mechanism can change the facing interval at a speed set from a plurality of speeds.   The first mold plate has a resin flow path for filling the cavity with molten resin, and a cooling flow path that is a flow path of a heat medium for cooling the first mold plate. The apparatus for manufacturing a resin molded product according to claim 9 or 10, wherein a path and a heating channel that is a channel of a heat medium for heating the first mold plate are formed.   The apparatus for producing a resin molded product according to any one of claims 9 to 11, wherein the first mold plate has an extruding portion that projects into the cavity toward the second mold plate. A pressurizing portion that pressurizes the peripheral wall of the cavity inward;
The said control part is a manufacturing apparatus of the resin molded product as described in any one of Claim 9 to 12 which pressurizes with the said pressurization part in response to the timing with which the said filling mechanism fills the said cavity with the said molten resin. .

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