JPH0464288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for supplying a raw material to a compression molding apparatus, that is, a resin mixed with short reinforcing fibers (glass fibers).

Conventional technology Conventional compression molding (injection molding)
As shown in FIG. 5, the supply cylinder 9
2, the pressure member 93 is lowered and the reinforcing fiber-containing resin 91 is pushed out into the casing 94. Then, a screw 95 disposed inside the housing 94 is connected to a motor 96.
The reinforcing fiber-mixed resin 91 is fed into the injection chamber 97 by driving the injector cylinder 98, and then the reinforcing fiber-mixed resin 91 is supplied into the compression molding device 99 by the operation of the injector cylinder 98, and then the cylinder 100 is actuated. Perform the desired compression molding. After the product 102 is cured by heating with the heater 101, the product 102 is taken out by opening the compression molding device 99 by operating the cylinders 100, 103.

Problems to be Solved by the Invention According to the conventional method as described above, it is not possible to increase the content of reinforcing fibers in the resin, and it can only be applied to products with low strength. Furthermore, defoaming is incomplete, resulting in a product of poor quality. Furthermore, since the screw 95 mechanically increases the pressure while feeding, it causes damage to the reinforcing fibers (damage rate, approximately 40%).
It is not possible to increase the strength of the product.

Means for Solving the Problems In order to solve the above-mentioned problems, the method for supplying reinforcing fiber-containing resin in the present invention includes placing short reinforcing fibers in a container, moving a pressure member within the container, and releasing the reinforcing fibers. is pressurized from one side, and after this pressurization is stopped, resin is supplied into the container from the other side while suction and deaeration is performed from the pressure member side to form a reinforcing fiber-mixed resin, and then suction deaeration and resin supply are performed. After stopping, the on-off valve attached to the other side of the container is opened while pressurizing with the pressure member, and the reinforcing fiber-mixed resin is supplied into the high-pressure generator. It is supplied to a compression molding device by high-pressure extrusion.

Effects According to the method of the present invention, the density of the short reinforcing fibers placed in the container is made uniform by the pressure applied by the pressure member, and the density is made uniform by the resin supply from the other side and the suction degassing from one side. , it can be impregnated with resin so that no air bubbles are formed. The reinforcing fiber-containing resin thus obtained is extruded into a high-pressure generator by applying pressure with a pressure member, and can be supplied to a compression molding device by high-pressure extrusion.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, 1A and 1B are a pair of containers, each of which has a hopper-like lower end and a cylindrical shape, and is arranged vertically. 2A and 2B are pressurizing members that can be raised and lowered within the containers 1A and 1B, and are formed in the shape of a conical piston at the lower end, and are raised and lowered by a cylinder device 3.
This is done by A and 3B. Above both containers 1A, 1B, cutter devices 6A, 6B are arranged to cut the long reinforcing fibers 4 into short reinforcing fibers 5, and these reinforcing fibers 5 can be supplied into the containers 1A, 1B. becomes. Both cylinder devices 3A, 3 as necessary
Between B is a filler tank 8 containing filler 7.
are arranged, and containers 1A and 1 of filler supply pipes 9A and 9B branched from the lower end of this filler tank 8.
The valve 10 is placed above B, and the valve 10 is placed between them.
A and 10B are provided. Said filler tank 8
A resin tank 12 containing resin 11 is arranged below the resin 11, and the resin 11 is taken out by a pump 13.
into the container 1 via the resin supply pipes 14A and 14B.
It is configured to be supplied to the lower parts of A and 1B. Note that valves 15A and 15 are also provided in the resin supply pipes 14A and 14B.
B is provided. Suction passages 16A and 16B are formed on the pressure member 2A and 2B sides, and this suction passage 1
The lower ends of 6A and 16B are opened into containers 1A and 1B, and the upper ends are connected to suction pipes 17A and 17B. These suction pipes 17A, 17B are connected to a suction device 29, and valves 18A, 18B are provided between them. At the lower ends of the containers 1A and 1B, a first
On-off valves 19A and 19B are installed, and these first
Reinforcing fiber-containing resin supply pipes 20A and 20B from the on-off valves 19A and 19B reach a high-pressure generator 22 having a pressurizing device 21 such as a cylinder. A supply pipe 24 from a second on-off valve 23 attached to the outlet of the high-pressure generator 22 is branched to a compression molding device 26 each having a cylinder 25. 27 is a stop valve, 28
indicates the product.

Next, details of the first on-off valves 19A, 19B will be explained based on FIG. 2.

Reference numeral 30 denotes a first cylindrical body consisting of an outer cylindrical body 30a and an inner cylindrical body 30b, in which a receiving port 31 and a supply port 32 are formed so as to face each other. Here both mouths 31,3
2, the axis is slightly shifted by l so that the supply port 32 is closer to one end. One end of the first cylindrical body 30 is closed by a lid 33, and a second cylindrical body 34 is connected to the other end. A piston 35 is slidably disposed within the second cylindrical body 34, and a sealing material 36 is attached to the outer periphery of the piston 35. A piston rod 37 having a smaller diameter than the piston 35 is connected from the other end of the piston 35, and the outer surface of the piston rod 37 and the second cylinder 3
A cylinder chamber 38 is formed between the inner surface of the cylinder 4 and the inner surface of the cylinder 4. The other end side of this cylinder chamber 38 is the V-packet 3
9, and this V gasket 39 is positioned via a presser foot 40 or the like. On the inner surface of the second cylindrical body 34 near the V gasket 39,
An annular groove 41 is formed that constantly communicates with the cylinder chamber 38. Also, the inner surface of the first cylinder 30 at a position near the second cylinder 34 is coated with the first cylinder 3.
An annular groove 42 is formed that opens inward. With this annular groove 42 open to the outside, the first cylindrical body 3
0 has a receiving hole 43 formed therein, and an annular groove 42
In contrast, the suction hole 44 and the discharge hole 45 are formed to be displaced from each other. The discharge hole 45 and the reception hole 43 are communicated with each other through a fluid supply pipe 47 having a check valve 46 . The suction hole 44 also has a check valve 48.
It communicates with a resin tank 51 containing a resin 50 through a fluid suction pipe 49 having a diameter of 1. A sliding body 52 that protrudes into the first cylindrical body 30 is connected to one end of the piston 35, and the tip of the sliding body 52 is connected to an inclined surface 5 that projects toward one end on the receiving port 31 side.
2a, and a portion facing the receiving port 31 is formed as a cutting blade portion 52b. An actuating device 53, for example a cylinder device, is associated with the outer end of the piston rod 37.

Note that the containers 1A and 1B are located at the outer end of the receiving port 31.
The lower ends of the supply port 32 communicate with each other, and the supply pipes 20A and 20B communicate with the outer ends of the supply port 32.

Next, details of the high pressure generator 22 will be explained based on FIG. 3.

60 is a first cylindrical body, which faces the receiving port 6;
1 and a supply port 62 are formed. One end of the first cylindrical body 60 is closed by a lid 63, and a second cylindrical body 64 is connected to the other end. This second
A piston 65 is slidably disposed within the cylinder 64, and a sealing material 66 is attached to the outer periphery of the piston 65. From the other end of the piston 65,
A piston rod 6 with a smaller diameter than this piston 65
A cylinder chamber 68 is formed between the outer surface of the piston rod 67 and the inner surface of the second cylindrical body 64. The other end side of this cylinder chamber 68 is closed by a V-packet 69.
is positioned via a presser foot 70 or the like. An annular groove 71 that constantly communicates with the cylinder chamber 68 is formed on the inner surface of the second cylindrical body 64 near the V-packet 69 . With the inside of the first cylindrical body 60 open to the outside, a receiving hole 73 is formed in the first cylindrical body 60, and a suction hole 74 and a discharge hole 75 are displaced with respect to the annular groove 71. It is formed as follows. The discharge hole 75 and the reception hole 73 are communicated with each other through a fluid supply pipe 77 having a check valve 76 . The suction hole 74 also communicates with a resin tank 81 containing a resin 80 via a fluid suction pipe 79 having a check valve 78 . A pushing rod 82 that protrudes into the first cylindrical body 60 is connected to one end of the piston 65 . The pressure device 21 is connected to the outer end of the piston rod 67.

Note that the supply pipe 20A,
20B is in communication, and a relay pipe 83 is in communication with the outer end of the supply port 62.

The structure of the second on-off valve 23 is the same as that of the first on-off valve 1 described above.
The structure is almost the same as that of 9A and 19B, and the only difference is the shape of the receiving port 31 as shown in FIG. do.

Note that the relay pipe 83 communicates with the outer end of the receiving port 31, and the supply pipe 24 communicates with the outer end of the supply port 32.
communicate.

In the following examples, the operation of supplying reinforcing fiber-containing resin will be explained below.

In FIG. 1, it is preferable that the operations in both containers 1A and 1B be performed with a half cycle shift. Like the container 1B on the right, with the pressure member 2B raised and pulled out, cutter device 6B is inserted through the upper end opening.
The short reinforcing fibers 5 cut by the container 1
B, and filler 7 is also inserted as needed. After putting in a predetermined amount, pressurizing member 2
B is lowered to pressurize the reinforcing fibers 5 and the like in the container 1B. This pressure makes the reinforcing fibers 5 uniform, and the density is determined by adjusting the pressure.
After pressurizing to a desired density like the container 1A on the left, pressurization is stopped and the pressurized state is locked. Then, the corresponding valves 15A and 18A are opened. Then, the resin 11 in the resin tank 12 is transferred to the resin supply pipe 1.
4A, etc., into the lower part of the container 1A, and a suction deaeration force acts on the inside of the container 1A through the suction path 16A, etc. As a result, the reinforcing fibers 5 are sequentially impregnated with the resin 11 from the bottom and are suctioned and degassed, making it possible to produce a bubble-free reinforcing fiber-containing resin. After manufacturing is completed, both valves 15A and 18A
close the door. Then, the first on-off valve 19A is opened and the pressure member 2A is brought into a pressurized state again. As a result, the reinforcing fiber-containing resin is passed from the first on-off valve 19A to the supply pipe 20A to the high pressure generator 22.
sent to. Then, by operating the pressurizing device 21 and applying high pressure in the high pressure generator 22, the second on-off valve 23 is opened, and the corresponding stop valve 27 of the target compression molding device 26 is opened. The compression molding device 26 may be supplied with reinforcing fiber-containing resin.

Next, the operation of the first on-off valves 19A and 19B will be explained with reference to FIG. The sliding body 52 is moved between the solid line and the imaginary line by driving the actuating device 53. During the movement to the retreat position shown by the imaginary line, the reinforcing fiber-containing resin flows into the first cylinder 30 from the containers 1A and 1B through the receiving port 31, and is further passed through the supply port 32 by the pressurizing force into the supply pipe. 20A, 2
Supplied to the 0B side. After supplying a predetermined amount, the sliding body 52 is moved forward. Then, first, intake port 3
The reinforcing fibers 5 located in the first cylindrical body 30 are cut by the cutting blade portion 52b, and the advancing sliding body 52 blocks the receiving port 31 and then the supply port 32. Become. Also, the sliding body 52
When the cylinder moves forward, the cylinder chamber 38 is gradually expanded between the V-packet 39 and the piston 35, and the resin 50 in the resin tank 51 is drawn into the cylinder chamber 38 by the suction force generated thereby. When retracting, the cylinder chamber 38 is contracted, but at this time, the check valve 48 prevents the resin 50 from flowing toward the fluid suction pipe 49, and this resin 50 flows into the fluid supply pipe 47, the receiving hole 43, and the annular groove It is press-fitted into the inner cylindrical body 30b through. This press-fitted resin 50 is applied to the inner surface of the inner cylindrical body 30b and the sliding body 5.
The flow passes between the outer surface of 2 and toward the openings 31 and 32, but since the sliding body 52 is moving in the opposite direction at that time, this relative movement causes the sliding body 52 to
The outer surface of the resin 1 will be cleaned.
It is possible to prevent the reinforcing fibers 5 from sticking or the reinforcing fibers 5 from getting stuck. Note that resin 11 and resin 5
The same quality as 0 is adopted.

Next, the operation of the high pressure generator 22 will be explained with reference to FIG. The push rod 82 is driven by the pressure device 21.
moves between the solid line and the virtual line. During the movement to the retreat position shown by the imaginary line, reinforcing fiber-containing resin flows into the first cylindrical body 60 from the first on-off valves 19A, 19B through the receiving port 51. After allowing a predetermined amount to flow in and closing the first on-off valves 19A and 19B, when the push rod 82 is moved forward, the intake port 6
Since the flow to the first side is blocked, the reinforcing fiber-containing resin in the first cylinder 60 is gradually pushed out through the supply port 62 and supplied to the second on-off valve 23 side via the relay pipe 83. become. When the aforementioned pushing rod 82 moves forward, the V-packet 69 and the piston 6
5 gradually expands, and the resin 80 in the resin tank 81 is drawn into the cylinder chamber 68 by the resulting suction force.
When retracting, the cylinder chamber 68 is contracted, but at that time, the fluid suction pipe 79 is closed by the check valve 78.
The resin 80 does not flow to the side, and this resin 80 is press-fitted into the first cylindrical body 60 via the fluid supply pipe 77 and the receiving hole 73. This press-fitted resin 80
flows between the inner surface of the first cylindrical body 60 and the outer surface of the pushing rod 82 toward both ports 61 and 62, but because the pushing rod 82 is moving in the opposite direction (retreating) at that time. This relative movement cleans the outer surface of the pushing rod 82, thereby preventing the resin 11 from sticking and the reinforcing fibers 5 from getting in (biting). Note that the resin 11 and the resin 80 are of the same quality.

Note that the second on-off valve 23 is the same as the first on-off valve 19 described above.
Performs the same action as A and 19B.

Effects of the Invention According to the method of the present invention having the above configuration, the short reinforcing fibers placed in a container can be made uniform to a desired density by pressurizing with a pressure member, and resin is supplied from one side and suction degassed from one side. This allows the reinforcing fibers to be impregnated without forming bubbles and without cutting the reinforcing fibers. The reinforcing fiber-containing resin thus obtained can be extruded into a high-pressure generator by applying pressure with a pressure member, and can be supplied by high-pressure extrusion to a compression molding device by the operation of the high-pressure generator. By doing so, it is possible to increase the content of reinforcing fibers in the resin, and a product with high strength can be obtained. In addition, it is possible to completely remove air bubbles, so that high-quality products can always be obtained. Furthermore, since the reinforcing fibers are fed under pressure without using a screw or the like, the reinforcing fibers are hardly damaged and the product can be strengthened. Furthermore, complete automation is possible, and high-speed production of large quantities is also possible.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, FIG. 1 is an overall explanatory diagram, FIG. 2 is a vertical cross-sectional view of the first on-off valve, and FIG. 3 is a vertical cross-sectional view of the high-pressure generator. FIG. 4 is a longitudinal sectional view of the second on-off valve, and FIG. 5 is an overall explanatory diagram of a conventional example. 1A, 1B... Container, 2A, 2B... Pressure member, 5
...Reinforced fiber (short length), 6A, 6B...Cutter device,
7... Filler, 11... Resin, 16A, 16B... Suction path, 17A, 17B... Suction pipe, 19A, 19B
...first on-off valve, 21...pressure device, 22...high pressure generator, 23...second on-off valve, 26...compression molding device, 2
7...stop valve, 28...product, 29...suction device.

Claims (1)

[Claims] 1 Put short reinforcing fibers into a container, pressurize the reinforcing fibers from one side by moving a pressure member within the container, and after stopping this pressurization, while performing suction degassing from the pressure member side. The resin is supplied into the container from the other side to make the resin mixed with reinforcing fibers, and then, after suction degassing and resin supply are stopped, the on-off valve attached to the other side of the container is opened while applying pressure with the pressure member, and the reinforcing fibers are mixed in. The mixed resin is supplied into a high pressure generator, and the reinforcing fiber mixed resin in the high pressure generator is
A method for supplying reinforcing fiber-containing resin, which is characterized by supplying the reinforcing fiber-containing resin to a compression molding device by high-pressure extrusion.