JP3133952B2 - Apparatus and method for producing cast polyamide resin molded article - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for producing a cast polyamide resin molded article, and more particularly to an apparatus and a method for producing a plurality of plate-shaped cast polyamide resin molded articles. It can securely clamp and prevent leakage of the polymerizable lactam liquid, and can clamp and separate the mold members in a short time. TECHNICAL FIELD The present invention relates to an apparatus and a method for manufacturing a cast polyamide resin molded article which can be easily removed from a mold.

[0002]

2. Description of the Related Art In a method for producing a cast polyamide molded article,
Mold made of aluminum, iron, etc. in a hot blast stove at 180-190 ° C
After the mold was heated to the temperature set in the above, the mold at the predetermined temperature was taken out of the furnace, a polymerizable lactam liquid was poured into the mold, and the mold was placed again in a hot-blast furnace to polymerize the lactam.
However, according to this method, when the heated mold is taken out of the hot blast stove and the lactam polymerization liquid is cast, the mold comes into contact with the outside air, causing heat unevenness at the mold temperature, thereby producing a high quality molded body. Was difficult.

Further, after the polymerization, when the mold is taken out of the hot air oven and the molded body is released, the mold temperature drops by about 40 to 50 ° C. because the mold comes into contact with the outside air. Before this, the mold had to be sufficiently heated again in a hot blast stove until the desired casting temperature was reached, and a large amount of mold preheating time was required for each mold release. For this reason, a high-speed production method in which a polymerizable lactam liquid is poured into a mold forcibly maintained at an arbitrary temperature, polymerized under adiabatic conditions, and the obtained molded body is peeled off from the mold surface, is a special method. It is disclosed in Japanese Patent Publication No. 2-44694.

[0004]

However, according to this method, the thickness is about 2 to 20 mm, and when a molded body having a thickness larger than that is produced, a temperature gradient is generated between the surface and the inside of the molded body. As a result, a compact having a cavity defect may be obtained. In addition, when a molded product having a large size is taken out of the mold without separating the mold, an operation time is required. The present invention has been made to solve such problems.
The mold is securely clamped and fixed to prevent leakage of the polymerizable lactam liquid, and the mold members are clamped and fixed in a short time. Another object of the present invention is to provide an apparatus and a method for producing a cast polyamide resin molded article which can be removed from a mold.

[0005]

That is, according to the invention of claim 1 of the present application, at least an apparatus for producing a plurality of plate-like cast polyamide resin molded articles by anionic polymerization of a polymerizable lactam liquid in a mold is provided. Between the heat-regulating side heating plate with one side movable and the plate mold attached to the side heating plate
And temperature adjustable one or more mobile in heating plate arranged, small
The space between the plate mold and the hot plate
3 parts of heat sink , spacer, moving hot platen and plate mold
Material or these three members and the spacer
Casting a polymerizable lactam liquid formed by a medium hot plate
When the cavity and the above members are sandwiched and fixed integrally
An apparatus for producing a cast polyamide resin molded article includes a clamp device that can be opened together, and a heat medium oil circulation device that further controls the temperature of the heat medium oil and sends the heat medium oil to each hot platen.

In the above manufacturing apparatus, a plurality of cavities for casting a polymerizable lactam liquid are mounted on a pair of side heating plates.
Moving with cavities and spacers arranged alternately between them
The cavity is formed by a hot plate , and these members are integrally clamped and fixed by a clamp device to obtain a cavity in which the polymerizable lactam liquid does not leak. If a plurality of clamping devices are used, the clamping force can be made uniform, and a molded product having a stable thickness and a small variation can be obtained even when used repeatedly. In addition, by operating the clamp device, the clamping and fixing of the member forming the cavity is released, and the side heating plate is returned to the original position, so that the plurality of plate-like molded bodies can be easily removed from the mold. Furthermore, since the temperature of the medium is adjusted by flowing the heat medium oil into the member forming the cavity, it is possible to mold a molded article having a large thickness and no cavity defects. In addition, temperature control and temperature control of the mold from the time of casting the polymerizable lactam liquid to the time of demolding of the molded body can be accurately controlled, and heat loss is small.

In the invention according to the second aspect of the present invention, since the heat insulating material is attached to the back of each side heating plate, the temperature of the mold can be adjusted from the time of casting the polymerizable lactam liquid to the time of removing the molded body. Temperature control can be controlled accurately and heat loss is small.

In the invention according to claim 3 of the present application, the spacer is a frame having one side open, and the frame has a passage for flowing the heat transfer oil, and the spacer is provided on the surface of the frame which comes into contact with the hot platen during movement. With the structure in which the packing is fitted, the temperature of each hot plate and the spacer forming the cavity can be controlled, so that the temperature control and temperature control of the mold can be accurately controlled, and the adhesion between the members forming the cavity can be enhanced. Thus, a cavity in which the polymerizable lactam liquid does not leak can be obtained.

In the invention according to claim 4 of the present application, the spacer is previously attached to at least one hot plate selected from the pair of side hot plates and the moving hot plate. The time required to assemble and clamp and fix the mold members made of hot plates is reduced.

[0010] In the invention according to claim 5 of the present application, the clamping device comprises a side clamping device attached to the left and right sides of the fixed-side hot platen and a bottom clamping device attached to the lower side. The clamping force between the hot platen and the spacer can be evenly distributed.

In the invention according to claim 6 of the present application, the clamping device allows the arm to move horizontally to clamp and fix each heating plate and the spacer integrally, and the arm is turned to turn each heating plate and the spacer. By moving the arm away from each of the hot plates and the spacers by operating the arm turning member to separate the arm from the heating plate and the spacer, the operator can easily enter the apparatus, and the mold removal operation of the molded body becomes easy.

[0012] In the invention according to claim 7 of the present application, a substantially anhydrous ω-lactam is anionically polymerized in a mold with a polymerizable lactam solution comprising at least an anionic polymerization catalyst and an anionic polymerization initiator. In the method for producing a cast polyamide resin molded product, a plate-shaped molding attached to a pair of temperature-adjustable side heating plates, at least one of which is movable.
Spacers and moving hot plates with adjustable temperature
And move one side hot plate to the other side hot plate,
Moving with the plate-shaped mold and the spacer interposed between them
Inject the polymerizable lactam liquid by holding and fixing the hot plate integrally
That forming a Cavity I, a polymerizable lactam solution moves a step of anionic polymerization in casting in the cavity, at least one side the heat plate by opening the clamping fixation of the heating plates and the spacer, Note And removing the molded polyamide resin molded body.

[0013] In the invention according to claim 7 of the present application, a plurality of cavities into which the polymerizable lactam liquid is cast are formed in a pair of side heating plates .
A moving platen and a spacer are formed between the mounted plate-shaped cavities while moving, and these members are integrally clamped and fixed to obtain a cavity in which the polymerizable lactam liquid does not leak. Molded polyamide resin molded articles can be manufactured. Further, since the temperature is adjusted by flowing the heat medium oil into the member forming the cavity, it is possible to mold a molded article having a large thickness and having no cavity defects. In addition, temperature control and temperature control of the mold from the time of casting the polymerizable lactam liquid to the time of demolding of the molded body can be accurately controlled, and heat loss is small.

[0014] In the invention according to claim 8 of the present application, the spacer is a frame body having one side open, and the frame body has a passage for flowing the heat transfer oil, and the spacer is superposed on the surface of the frame body which is in contact with the intermediate heat plate. Since the packing that prevents leakage of the conductive lactam liquid is fitted, the temperature of the members forming the cavity can be controlled, and the temperature control and temperature control of the mold can be accurately controlled. Adhesion between them can be enhanced, and a cavity free of polymerizable lactam liquid can be obtained.

[0015]

FIG. 1 is a front view of an apparatus for manufacturing a cast polyamide resin molded article according to the present invention, FIG. 2 is a plan view showing a state at the time of molding in FIG. 1, and FIG. A diagram showing a state where a clamp device is mounted on a fixed-side hot platen of the device,
FIG. 4 is a diagram of FIG. 1 viewed from the AA direction.

An apparatus 1 for producing a cast polyamide resin molded article according to the present invention comprises a fixed hot platen 2 on which a plate-shaped mold 4 is mounted.
Similarly, the moving-side hot platen 3 mounted with the plate-shaped mold 4 and facing the fixed-side hot platen 2, and at least one or more sheets disposed between the fixed-side hot platen 2 and the moving-side hot platen 3 A part of the cavity 9 for casting the polymerizable lactam liquid, which is interposed between the moving hot platen 5, the fixed-side hot platen 2, the moving-side hot platen 3, and the hot platen 5 during moving. The spacer 6 to be formed and the moving-side hot platen 3 are moved to the fixed-side hot platen 2 so that each of the hot plates 2, 3, 5,.
It comprises a clamp device 7 for integrally holding and fixing each member of the plate-shaped mold 4 and the spacer 6 and opening the same. The cavity 9 has a plate mold 4 and a spacer 6,
Spacer 6, moving hot platen 5, plate mold 4, or
Formed by moving hot platen 5, spacer 6, and moving hot platen 5
Is done.

In the fixed-side hot platen 2, a heat insulating plate 11 is vertically fixed on a horizontally arranged support base 10, and the heat insulating plate 1
A heat insulating material 12 such as rock wool is mounted on the entire back of the heat sink 1, and a plate-shaped mold 4 is held and mechanically fixed to the front of the heat insulating panel 11 by a projecting frame 13.

In the moving hot platen 3, similarly to the fixed hot platen 2, an insulating board 11 is vertically fixed to a horizontally arranged support base 10, and a heat insulating material 12 is provided on the entire back surface of the insulating board 11. At the same time, the plate-shaped mold 4 is held and mechanically fixed to the front surface of the heat insulating panel 11 by the projecting frame 13. However, in the moving-side hot platen 3, the support 10 is
And a rail 22 provided on the substrate 21
It can be moved manually or automatically on the upper side to approach the fixed-side hot platen 2 side and to be separated therefrom. In addition, the plate-shaped mold 4
It has the same structure as that attached to the fixed-side hot platen 2.

As shown in FIGS. 5 and 6, the plate-shaped mold 4 is a hollow body formed of a metal plate such as aluminum, iron, or the like. 1
5 are provided at regular intervals, and have an oil passage 16 which communicates with the heat medium oil. When the heat transfer oil enters from an oil port 17 provided on the lower side of the plate-shaped mold 4, it flows through a communicating oil passage 16 and heats the entire inside of the plate-shaped mold 4 from an oil outlet 18 provided on the upper side. The oil is discharged, travels to the heat medium oil circulation device 8 via the pipe 19, and circulates therebetween. In addition, the above-mentioned bar 1
5 is a reinforcing material for preventing deformation of the plate-shaped mold 4,
A molded article having a stable thickness and less variation can be obtained.

Between the fixed-side hot platen 2 and the moving-side hot platen 3, a plurality of moving hot plates 5 having the same structure as the plate-shaped mold 4 having an oil passage through which the heat medium oil flows are provided. (Here 3
) Are arranged in parallel. As shown in FIGS. 1 and 4, the moving hot platen 5 includes a cart 26 having two wheels 25 installed on one of the plurality of rails 22 laid on the board 21, Is fixed across a truck 26 having two other wheels 25 installed on one rail 22. In addition, since the distances between the carts 26 of the moving hot plates 5 are different from each other, the moving hot plates 5 can approach each other without bringing the carts 26 into contact even when they are brought closer to each other. In this embodiment, the distance between the carriages 26 of the moving hot platen 5 close to the fixed-side hot platen 2 is the largest, and the moving-side hot platen 3
It is getting smaller towards. Of the two rails 22, one of the rails 22 and the wheel 25 are fitted, and the moving hot platen 5 does not come off the rail 22 during the movement.

As shown in FIGS. 7 to 9, the spacer 6 is a U-shaped frame having one side open, and each side is provided with a through hole 30 through which a bolt is passed at regular intervals. Inside the outer periphery of the frame, there is a communicating oil passage 31 through which the heat medium oil passes, and the heat medium oil passes through an oil passage 31 from an oil port 32 provided at the upper part of the side, and passes through the oil passage 31 on the opposite side. Exit the oil outlet 33 provided at the top,
The spacer 6 is heated.

In order to enhance the sealing effect between the spacer 6 and each hot platen 5 during movement and between the spacer 6 and the plate mold 4,
A packing 34 made of a rubber elastic material such as urethane or silicone rubber or a fluorine resin material is fitted into and attached to the dovetail grooves 35 provided on both surfaces of the frame of the spacer 6. Since the packing 34 is fitted into the dovetail groove 35, it does not easily come off. In this case, the spacer 6 is fixed by inserting bolts from the through holes 30 into the plate-shaped mold 4 of the fixed-side hot platen 2 or the moving-side hot platen 3 or one surface of the moving hot platen 5.

The clamping device 7 is a plate-like molding for moving the movable hot platen 3 toward the fixed hot platen 2 to form the cavity 9.
And has a function of integrally holding, fixing and opening the moving platen 5, each moving platen 5, and the spacer 6 during movement . Clamping device 7
3 includes a side clamp device 7a mounted on the left and right sides 37 of the fixed-side hot platen 2 and a bottom clamp device 7b mounted on the lower side 38.

The side clamp device 7a shown in FIG. 10 is a plate-like module for forming the cavity 9 by moving the arm horizontally.
, A moving platen 5, an arm holding member 40 for integrally holding and fixing the spacer 6, a plate-shaped mold 4 for turning the arm to form the cavity 9, a moving platen 5 during moving,
The arm 6 is constituted by an arm turning member 41 which releases the clamping and fixing of the spacer 6 and moves away therefrom. In the clamp device 7a, the bracket 44 on which the air cylinder 43 is pivotably mounted is connected to the fixed-side hot platen 2 via the heat insulating material 45.
The plate-shaped mold 4 of the other fixed-side hot platen 2 is
A support block 47 is fixed to an end portion of the device by a screw via a heat insulating material 48.

In the arm holding member 40, the arm 50 has a front end portion 51 bent at a right angle and a rear end portion 53 having a through hole 52 into which a rod is inserted. The arm 50 is inserted into a through hole 52 provided in the rear end portion 53. The connected rod 54 is connected to the hydraulic cylinder 55. The rod 54 forms a sliding part 56 of a hemispherical body with a protruding tip, and is in contact with a sliding part 57 of a depressed hemispherical body provided on the support block 47.

A shaft (not shown) is inserted into a through hole provided near the tip of the rod 54, and serves as a turning shaft 58 of the arm holding member 40. In the arm holding member 40, when the hydraulic cylinder 55 is operated to cause the rod 54 to protrude, the sliding part 57 of the concave hemispherical body of the support block 47 is moved to the sliding part 5 of the hemispherical body protruding from the rod 54.
The arm 50 moves in the direction of integrally holding and fixing each of the hot plates forming the cavity 9 and the spacer 6 by receiving a load by abutting on the spacer 6.

The sliding part 57 of the concave hemispherical body of the support block 47 and the sliding part 5 of the hemispherical body protruding from the rod 54
By having 6, the pivot shaft 58 is not subjected to a clamping force, and the pivot shaft 58 can be downsized. Furthermore,
The hydraulic cylinder 55 can be attached to the fixed-side hot platen 2 side, so that an operator can easily enter and exit the apparatus.

In the arm swiveling member 41, the air cylinder 43 is rotatably mounted on a bracket 44 fixed to the frame 46 of the fixed-side hot platen 2, and the rod 60 of the air cylinder 43 is connected to the arm 50 via a lever and a swivel shaft 58. It is connected to. When the air cylinder 43 operates and the rod 60 is retracted, the arm 50 pivots about the pivot shaft 58. At this time, since the sliding portion 56 of the rod 54 and the sliding portion 57 of the support block 47 have a hemispherical shape,
The arm 50 can turn smoothly.

As shown in FIGS. 11 and 12, the bottom clamping device 7b comprises an arm clamping member 40 and an arm turning member 41. The arm clamping member 40 has the same structure as that of the side clamping device 7a. I have.

In the arm turning member 41, a hollow elongated slant rail 7 is provided on the lower bottom of the arm 50 via a heat insulating material 70.
1, the inclined rail 71 has two shafts 72, 73 fixed therein. The shaft 72 is connected to a rod 75 of an air cylinder 74 fixed to the support 21, and the arm 50 is moved upward by the operation of the air cylinder 74, and the other shaft 73 is a shaft 77 installed on the support 21. , And serves as a pivot axis of the arm 50.
At both ends of the inclined rail 71, stoppers 78 for restricting the movement of the inclined rail 71 are provided.

In the bottom clamping device 7b, the hydraulic cylinder 55 of the arm holding member 40 is operated to move the rod 5
4 is retracted and the arm 50 is released from the clamp between the hot plates forming the cavity 9 and the spacer 6.
Swings while falling around the shaft 73 as a center axis by its own weight. At this time, the stopper 78 of the moving inclined rail 71
Abuts on the shaft 73, and the drop of the arm 50 stops.

The heat medium oil circulation device 8 includes a heating device for heating the heat medium oil put in the tank and a pump for circulating the heat medium oil. The plate-shaped mold 4 mounted on the hot platen 3, the hot platen 5 during movement, and the spacer 6 are connected.

Next, a method for producing a cast polyamide resin molded article using the production apparatus according to the present invention will be described below. First, the fixed-side hot platen 2 and the moving-side hot platen 3 whose temperature has been adjusted
The three moving hot plates 5 whose temperature has been adjusted are arranged between the plate-shaped molds 4 and 4 respectively mounted thereon, and one of the fixed hot platen 2, the moving hot platen 5, and the moving hot platen 3 A spacer 6 having a predetermined thickness is fixedly installed on the surface of the substrate with bolts. In this case, the spacer 6 is not mounted on the moving hot platen 5 located in the middle of the three plates. Thereafter, the moving-side hot platen 3 is moved so that the spacer 6 is fixed to the plate-shaped mold 4 and the moving hot platen 5.
Alternatively, a cavity 9 for casting the polymerizable lactam liquid by being sandwiched between the hot plates 5 and 5 while moving is formed, and these members are mounted on the left and right sides 37 of the fixed side hot plate 2 on a plurality of sides. The unit clamp device 7a and the plurality of bottom clamp devices 7b mounted on the lower side portion 38 integrally hold and fix.

That is, the hydraulic cylinder 55 of the side clamp device 7a and the bottom clamp device 7b is operated to
4 is a projected movement, under a load dimple-like hemispherical face piece of the sliding portion 57 of the support block 47 is in contact with the sliding portion 56 of the projecting hemispheres tetrahedral rod 54, plate arms 50 to form a cavity 9 The mold 4 moves in the direction of integrally holding and fixing the hot platen 5 and the spacer 6 during each movement . Further, the heat transfer oil is introduced from the heat transfer oil circulation device 8 to the plate-shaped mold 4 mounted on the fixed-side heat plate 2 and the transfer-side heat plate 3, the moving heat plate 5, and the spacer 6, at 130 to 190 ° C. Temperature and preheat.

Thereafter, a polymerizable lactam liquid is poured into the cavity 9, and a metal tubular body coated with a resin material is put into the opening of the cavity 9 and anion-polymerized in a closed state. The polymerization time is 20 to 100 minutes, and when this is completed, the temperatures of the plate-shaped mold 4 of the fixed-side hot platen 2 and the moving-side hot platen 3, the moving hot platen 5, and the spacer 6 are reduced to the temperatures at the time of preheating. .

The hydraulic cylinders 55 of the side clamp device 7a and the bottom clamp device 7b are operated to move the rod 54 in the retracting direction, and the arm 50 is moved to the cavity 9
Is moved to the side where the holding and fixing of each of the hot plates and the spacer 6 forming the above are opened. Subsequently, by the arm turning member 41,
The rod 60 is retracted, and the arm 50 is turned. Further, in the bottom clamp device 7b, when the clamping and fixing of the arm 50 is released, the arm 50 is dropped by its own weight and turned.

In this way, after the plate-shaped mold 4, the moving hot platen 5, and the spacer 6 of the fixed hot platen 2 and the moving hot platen 3 are mechanically opened, the moving hot platen 3 is returned to its original state. When returned to the position, the operator can enter the apparatus and easily remove the plurality of plate-like cast polyamide resin molded articles from the mold.

The polymerizable lactam liquid is obtained by adding an anionic polymerization catalyst and an anionic polymerization initiator to ω-lactam, and the ω-lactam is substantially anhydrous α-piperidone, ε-caprolactam, ω-lauro. Lactam or a mixture of two or more of these, and industrially advantageous lactams are ε-caprolactam and ω-laurolactam.

As the anionic polymerization catalyst, known ω-lactam polymerization catalysts such as sodium hydride, lithium hydride, sodium and potassium can be used. 1 to 2.0 mol%. And, as the initiator for anionic polymerization, for example, N-acetyl-ε-caprolactam, isocyanate,
Diisocyanates, urea derivatives, urethanes, and isocyanurate derivatives, and the added amount thereof is preferably in the range of 0.05 to 1.0 mol% based on ω-lactam.

In the above production method, the anionic polymerization catalyst
A method of adding and mixing an anionic polymerization initiator at or after casting after adding and dissolving to a lactam, or injecting ω-lactam containing an anionic polymerization catalyst and ω-lactam containing an anionic polymerization initiator It is adjusted by a method of adding and mixing at the time of molding or after casting.

In carrying out the method of the present invention, oils, waxes, zinc stearate, calcium stearate and the like which do not inhibit polymerization, and reinforcing materials such as carbon fiber and wollastonite may be added in addition to the above components. It is possible.

[0042]

As described above, according to the first aspect of the present invention, at least one of the movable side heating plates which can be moved and the plate-shaped mold mounted on the side heating plate are disposed.
One or more moving hotplates with adjustable temperature and at least
Spacer interposed between plate mold and hot plate during moving
Three members, a spacer, a moving hot platen and a plate mold,
Or a moving hot plate facing these three members and the spacer
To cast the polymerizable lactam liquid formed by
Tee and the above members are integrally clamped and fixed
A polymerizable lactam is provided in a cast polyamide resin molded article manufacturing apparatus including a clamp device that can be opened and a heat medium oil circulation device that further controls the temperature of the heat medium oil and sends the heat medium oil to each hot platen. A plurality of cavities into which liquid is poured are formed by a hot plate and a spacer while moving between a pair of side hot plates, and these members are integrally clamped and fixed by a clamp device to prevent the polymerizable lactam liquid from leaking. Can be obtained. If a plurality of clamping devices are used, the clamping force can be made uniform, and a molded product having a stable thickness and a small variation can be obtained even when used repeatedly. Furthermore,
By operating the clamp device, the holding and fixing of the member forming the cavity is released, and the side heating plate is returned to the original position, whereby there is an effect that the plurality of plate-like molded bodies can be easily removed from the mold.

Further, since the temperature is adjusted by flowing the heat medium oil into the member forming the cavity, it is possible to mold a molded article having a large thickness and no cavity defects. In addition, temperature control and temperature control of the mold from the time of casting the polymerizable lactam liquid to the time of demolding of the molded product can be accurately controlled, and there is an effect of reducing heat loss.

In the invention according to the second aspect of the present invention, since the heat insulating material is attached to the back of each side heating plate, it is possible to control the temperature of the mold from the time of casting the polymerizable lactam liquid to the time of releasing the molded body. Temperature control can be controlled accurately, and there is an effect that heat loss is small.

In the invention according to claim 3 of the present application, the spacer is a frame body having one side open, and the frame body has a passage for flowing the heat transfer oil, and is provided on the surface of the frame body which comes into contact with the hot platen during movement. With the structure in which the packing is fitted, the temperature of each hot plate and the spacer forming the cavity can be controlled, so that the temperature control and temperature control of the mold can be accurately controlled, and the adhesion between the members forming the cavity can be enhanced. Thus, there is an effect that a cavity in which the polymerizable lactam liquid does not leak can be obtained.

In the invention according to claim 4 of the present application, since the spacer is previously attached to at least one hot plate selected from the pair of side hot plates and the moving hot plate, the spacer is in contact with the pair of side hot plates and the moving hot plate. This has the effect of shortening the time required for collecting and fixing the mold members formed of the hot plates.

In the invention according to claim 5 of the present application, the clamping device comprises a side clamping device attached to the left and right sides of the fixed-side hot platen and a bottom clamping device attached to the lower side. This has the effect of uniformly dispersing the clamping force between the hot platen and the spacer.

According to the invention as set forth in claim 6 of the present application, the clamping device allows the arm to move horizontally to clamp and fix each heating plate and the spacer integrally, and the arm is rotated to turn each heating plate and the spacer. The arm swivel member that separates the arm from the hot plate and the spacers, especially when the arm swivel member is operated to move the arm away from the hot platen and the spacer, makes it easier for the operator to enter the device and facilitates the removal of the molded product. There is.

In the invention according to claim 7 of the present application, at least one of the movable side heat plates which can be moved is provided with a temperature-adjustable pair.
Spacer and temperature adjustable between mounted plate molds
Heating plates are arranged alternately during moving, and one side heating plate is
Move to the board side and interpose it between the above plate mold and it
The spacers and the moving hot plate are sandwiched and fixed together to allow for polymerization.
A step of forming a cavity for casting a lactam liquid, a step of injecting a polymerizable lactam liquid into the cavity and anion-polymerizing, and opening at least one side of the hot plate by opening and fixing each hot plate and a spacer. Moving and taking out the cast polyamide resin molded article; and a method of manufacturing a cast polyamide resin molded article, comprising: casting a plurality of cavities into which a polymerizable lactam liquid is cast between a pair of side heating plates. Formed by a board and a spacer, these members can be integrally sandwiched and fixed to obtain a cavity in which the polymerizable lactam liquid does not leak, and a plurality of plate-like cast polyamide resin molded articles can be manufactured at the same time. . In addition, since the heat medium oil is caused to flow inside the member forming the cavity to control the temperature, it is possible to mold a molded article having a large thickness and having no cavity defects. In addition, temperature control and temperature control of the mold from the time of casting the polymerizable lactam liquid to the time of demolding of the molded product can be accurately controlled, and there is an effect of reducing heat loss.

According to the invention of claim 8 of the present application, the spacer is a frame having one open side, and the frame has a passage for flowing the heat transfer oil, and is provided on the surface of the frame which comes into contact with the hot platen during movement. Since the packing that prevents the leakage of the polymerizable lactam liquid is fitted, the temperature of the members forming the cavity can be controlled, and the temperature control and temperature control of the mold can be accurately controlled, and the cavity is formed. There is an effect that the adhesion between the members can be increased, and a cavity in which the polymerizable lactam liquid does not leak can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus for producing a cast polyamide resin molded article according to the present invention.

FIG. 2 is a front view showing a state at the time of molding in FIG.

FIG. 3 is a view showing a state where a clamp device is mounted on a fixed-side hot plate of the manufacturing apparatus shown in FIG. 1;

FIG. 4 is a view of FIG. 1 as viewed from the AA direction.

FIG. 5 is a front view of the plate-shaped mold.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a front view of the spacer.

FIG. 8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is an enlarged view of a portion C in FIG. 8;

FIG. 10 is a plan view of the side clamp device.

FIG. 11 is a front view of the bottom clamping device.

FIG. 12 is a view showing a state where the bottom clamp device of FIG. 11 has released the holding and fixing of each hot plate forming a cavity and a spacer member.

[Explanation of symbols]

 2 Fixed-side hot platen 3 Moving-side hot platen 4 Plate-shaped mold 5 Moving hot platen 6 Spacer 7 Clamping device 7a Side clamping device 7b Bottom clamping device 8 Heat transfer oil circulation device 9 Cavity

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 39/22-39/44 B29C 33/02-33/04 B29C 33/20-33/28

Claims (8)

(57) [Claims] 1. A polymerizable lactam solution anionically polymerized in a mold to produce a plurality of plate-like cast polyamide resin molding apparatus, a temperature-adjustable side heating plate which is movable at least one, side Temperature control placed between plate molds mounted on hot platen
One or more possible moving hot plates and at least a plate mold and a moving hot plate interposed
Three members, a spacer, a spacer, a moving hot platen and a plate mold, or
Are moved by the moving platen facing these three members and the spacer.
Cavity for casting polymerizable lactam liquid formed by
And the above members can be clamped and fixed together and opened.
An apparatus for manufacturing a cast polyamide resin molded article, comprising: a clamp device configured to perform the above-mentioned operation; and a heat medium oil circulation device that further controls the temperature of the heat medium oil and sends the heat medium oil to each hot platen. 2. The apparatus for producing a cast polyamide resin molded article according to claim 1, wherein a heat insulating material is attached to a back portion of each side heating plate. 3. A frame body in which the spacer is open on one side,
The apparatus for producing a cast polyamide resin molded article according to claim 1, wherein the frame body has a passage for flowing the heat transfer oil, and the packing is fitted on the surface of the frame body which contacts the hot platen during movement. 4. A spacer previously mounted on a pair of side heating plates
The apparatus for producing a cast polyamide resin molded article according to claim 1 or 3, wherein the apparatus is attached to at least one member selected from a plate mold and a moving hot platen. 5. The cast polyamide resin molded article according to claim 1, wherein the clamping device comprises a side clamping device mounted on the left and right sides of the fixed-side hot platen and a bottom clamping device mounted on the lower side. Manufacturing equipment. 6. A clamping device having an arm holding member for horizontally holding an arm and holding and fixing each hot plate and the spacer integrally, and an arm turning member for turning the arm to separate from each hot plate and the spacer. The apparatus for producing a cast polyamide resin molded article according to claim 1 or 5, wherein 7. An anionic polymerization of a polymerizable lactam solution comprising at least an anionic polymerization catalyst and an anionic polymerization initiator on substantially anhydrous ω-lactam in a mold to produce a plurality of plate-like cast polyamide resin molded articles. In the method, at least one of the plate-shaped molds attached to a pair of temperature-adjustable side heating plates that can be moved is provided with a spacer and a temperature controller.
The hot plates that can be moved are alternately arranged, and the hot plate on one side is
To the side platen side, and between the plate mold and the
The intervening spacer and the moving hot plate are integrally clamped and fixed.
Forming cavity for casting polymerizable lactam liquid
A degree, a step of anion polymerizing the polymerizable lactam solution was cast into the cavity, by opening the clamping fixation of the heating plates and the spacers move at least one side heating plate, a cast polyamide resin molded product A method for producing a cast polyamide resin molded body, comprising: a step of removing; 8. A frame body in which the spacer is open on one side,
8. The cast polyamide resin molded article according to claim 7, wherein the frame body has a passage for flowing the heat transfer oil, and a packing for preventing the polymerizable lactam liquid from leaking is fitted on the surface of the frame body which comes into contact with the middle heating plate. Manufacturing method.