JPS6344045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding machine for liquid resin, which has a supply section for three components, such as a main component, a curing agent, and a colorant, and is equipped with a static mixer in a mixing cylinder. In particular, a first agent supply pipe having a first dividing hole at its tip on the upstream side of the static mixer and a second agent supply pipe are provided concentrically around the outer periphery of the first agent supply pipe, A first diffusion plate having a first resin passage hole drilled at a position not aligned with the first dividing hole is provided in the pipe so as to be in contact with the tip of the first agent supply tube, and further, a first diffusion plate is provided in contact with the tip of the first agent supply tube. A two-drug transport pipe connected to the pipe via a first diffusion plate and having a second split hole bored at its tip is provided, and a third-drug supply pipe is provided concentrically around the outer circumference of the two-drug transport pipe, For liquid resin, a second diffusion plate having a second resin passage hole bored in a position not aligned with the second dividing hole is provided in the third agent supply pipe so as to be in contact with the tip of the second agent conveying pipe. It is related to injection molding machines.

In general, there are various types of injection molding machines for liquid resin, but the premix method, premix chamber method, special screw method, etc. are usually used.

In the pre-mixing method, the main agent, curing agent and coloring agent are mixed in advance by an independent mixing device,
The mixture is supplied to a plunger and injected. In this method, the curing reaction of the resin has already begun in the mixing device, so the pot life is short, and therefore the mixture must be handled quickly, and the process from the mixing device to the injection molding machine is short. It has the drawback that it is difficult to transport, and the cleaning work of the mixing device is troublesome.

In the premix chamber method, mixing devices are distributed for each injection molding machine, and only the required amount is mixed according to the operation of the injection molding machine.The injection molding machine uses the conventional inline screw type. be. In this method, since a mixing device is attached to each injection molding machine, the structure of the injection molding machine becomes complicated, and as a result, the price becomes high.

In addition, the special screw method is an improved screw of the conventional in-line screw type injection molding machine, and integrates the mixing device and the injection molding machine with a structure suitable for stirring liquid resin. This method has disadvantages in that it has complicated movable parts, which causes many failures, complicates maintenance, makes it difficult to seal the liquid resin, and makes the device expensive.

Recently, a static mixer system has been proposed to solve the problems of the conventional systems as described above. In this method, an injection molding machine is configured with a mixing device that has no moving parts, that is, a static mixer, and takes advantage of the fact that the base material, curing agent, and colorant are all liquid, and uses the pressure of the material supply pump to Compared to the above-mentioned systems, this method has the advantages of a simpler structure, fewer failures, easier maintenance, especially easier cleaning, and lower cost.

However, in the static mixer method, the base agent, curing agent, and coloring agent are supplied simultaneously, and the mixing action by the static mixer is effective only when these three agents are simultaneously present in the same area. If there is a time lag in the supply of the three drugs, the group of single-liquid drugs created by the time difference cannot be dispersed into the other drugs, resulting in a phenomenon in which uneven mixing remains until the end.
As a result, there are disadvantages in that the resin is not cured properly, the mechanical strength and electrical insulation resistance of the molded product are deteriorated, and the molded product is uneven in color.

Moreover, in this method, the injection amount for each shot is intermittently supplied by starting and stopping the supply pump, so there may be deviations in the starting times of the base agent supply pump, curing agent supply pump, and colorant supply pump, and Differences in the supply time of the three components inevitably occur due to differences in the shape and length of the resin transport pipes from the pump to the injection device (mixing device), as well as differences in the viscosity of the three components. . In particular, the phenomenon of the supply time difference occurring is noticeable when starting work after a long period of work stoppage, for example, when starting work the next day after finishing the previous day's work.

In view of the problems of resin mixing due to the structural limitations of an injection molding machine based on the static mixer method, the present invention has a structure in which a diffusion section is provided upstream of a static mixer housed in a mixing cylinder. By doing so, it is an object of the present invention to provide an excellent injection molding machine for liquid resin, which eliminates the above-mentioned drawbacks and eliminates uneven mixing of the main resin, curing agent, and colorant in an extremely efficient manner.

In accordance with the above object, the structure of the present invention is such that when mixing the base agent, curing agent, and coloring agent, the base agent,
The curing agent and the coloring agent are allowed to diffuse and stagnate together to create a widely distributed transport delay time for each of the three components, and within the transport delay time, preliminary mixing is performed by collision and splitting of the three components; This eliminates the uneven mixing caused by the supply time lag of the three drugs, allowing the three drugs to exist simultaneously in the same area, and the subsequent static mixer completely mixes the three drugs with no uneven time difference. The gist of this is that it has been made possible to do so.

Next, embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 1 is a mixing cylinder, which is equipped with a nozzle part 2 at its tip, and a static mixer 3 is installed on the upstream side of the nozzle part 2. Upstream of the static mixer 3, a first diffusion section 4 and a second diffusion section 5 are provided.

In the first diffusion section 4, a first agent, for example, a main agent, a supply pipe 6, and a second agent, for example, a curing agent, a supply pipe 7 are provided concentrically around the outer periphery of the supply pipe 6, and the two supply pipes A first annular space 8 is formed between 6 and 7. At the tip of the first agent supply pipe 6,
A plurality of first dividing holes 9 are bored at appropriate intervals. Also, a first diffusion plate 10 is disposed within the second agent supply pipe 7 at right angles to the axis, and is in contact with the tip of the first agent supply pipe 6, as is clear from FIG. The first agent supply pipe 6 is connected to the first diffusion plate 10.
A first resin passage hole 11 that opens at a position that is not aligned with the first dividing hole 9 is formed. Due to the presence of the first diffusion plate 10, the inside of the first agent supply pipe 6 communicates with the first annular space 8 only through the first dividing hole 9, and the first annular space 8 communicates with the first annular space 8 only through the first dividing hole 9. It communicates via a resin passage hole 11 with a static mixer 3 provided downstream thereof. Note that 10a is a rectifying projection provided on the first diffusion plate 10.

In the second agent supply pipe 7, a first preliminary diffusion plate 12 is provided at a suitable position upstream of the first diffusion plate 10, and the first preliminary diffusion plate 12 includes the first diffusion plate 10. A resin passage hole 13 is formed at a position that is not aligned with the first resin passage hole 11 of the first resin passage hole 11 .

A two-drug transport pipe 14 is connected to the second-drug supply pipe 7 via a first diffusion plate 10 and extends to the second diffusion section 5 .

The structure of the second diffusion section 5 is the same as the structure of the first diffusion section 4. That is, the two-drug transport pipe 1
A third agent supply pipe 15 is concentrically provided on the outer periphery of the third agent supply pipe 4, and a second annular space 16 is formed between them.

Second split holes 17 are bored at appropriate intervals at the tip of the second-drug transport pipe 14, while a second diffusion plate 18 is provided in the third-drug supply pipe 15 at right angles to the axis. It is arranged and abuts on the tip of the two-drug transport tube 14 .

The second diffusion plate 18 has a second resin passage hole 19 that opens at a position that does not align with the second dividing hole 17.
is drilled. Note that 18a is a rectifying protrusion.

Further, a second preliminary diffusion plate 20 is provided on the upstream side of the second diffusion plate 18, and a resin is inserted into the second preliminary diffusion plate 20 at a position that is not aligned with the second resin passage hole 19. A passage hole 21 is bored. 2
Reference numeral 2 denotes a cooling jacket provided around the outer periphery of the mixing cylinder 1 in the portion where the static mixer 3 is installed.

In the above configuration, when performing injection molding, the first agent, for example, epoxy, polyester,
The main agent A, such as urethane or silicone rubber, is transported through the first agent supply pipe 6 by a supply pump, collides with the center of the first diffusion plate 10, and the flow is divided by the first dividing hole 9. and flows outward into the first annular space 8.

In this way, there is a delay in the transfer time while the first agent A is subjected to the collision and splitting action, and then it heads toward the first resin passage hole 11 of the first diffusion plate 10. At this time, the divided first agent flows out into the non-porous part between the first resin passage holes 11 of the first diffusion plate 10, so that it does not short-circuit and flow to the first resin passage holes 11, and the above-mentioned The effect of delaying the transfer time becomes more reliable.

On the other hand, the second agent supplied into the second agent supply pipe 7,
For example, the curing agent B is transported in the annular space 8 and first reaches the first pre-diffusion plate 12, and most of the second agent collides with the non-porous part of the first pre-diffusion plate 12, where it is reversed. It flows backwards and takes a detour, and then heads toward the resin passage hole 13 and passes through it. During this time, the second agent undergoes a preliminary delay in transfer time.

Next, the second agent that has passed through the first preliminary diffusion plate 12 reaches the first diffusion plate 10, where it is subjected to collision, backflow, and detour effects in the same manner as described above, thereby making the delay in transfer time more reliable. Become.

At this time, since the opening positions of the resin passage holes 13 of the first preliminary diffusion plate 12 and the first resin passage holes 11 of the first diffusion plate 10 are not aligned, the resin may collide with the first preliminary diffusion plate 12. However, some of the second agent that directly passed through the resin passage hole 13 also passed through the first diffusion plate 10.
Since it collides with the non-porous part of the second agent, its transfer time is delayed, and the effect of delaying the transfer time on the entire second agent becomes more effective.

In this way, the first agent A collides with the first diffusion plate 10, is divided by the first dividing hole 9 of the first agent supply pipe 6, and flows outward, and the inside of the first annular space 8. The second agent B that is transferred and reversed and detoured by the first diffusion plate 10 stays near the first diffusion plate 10, causing a delay in the transfer time, during which time the two agents collide with each other. Large disturbances occur in the flow, causing them to spread and mix with each other.

In this way, the two agents that have come to exist simultaneously in the same area are transported to the first resin passage hole 1 of the first diffusion plate 10.
1, is transferred through the two-drug transport pipe 14, and reaches the second diffusion section 5.

Here, the second agent collides with the center of the second diffusion plate 18, is divided by the second dividing hole 17, and flows outward into the second annular space 16, but during this time, the second agent is transferred. The effect of causing a time delay is the same as in the case of the first agent in the first diffusion section 4 described above.

On the other hand, the third agent supplied to the third agent supply pipe 15,
For example, the colorant C is transported within the second annular space 16, collides with the second preliminary diffusion plate 20 and the second diffusion plate 18 one after another, reverses and flows back, and detours, causing a delay in the transport time. The same applies to the second agent in the first diffusion section 4.

In this way, the two drugs A+B flowing outward from the second dividing hole 17 of the two drug transport pipe 14 and the second annular space 16
The third agent C transferred within the second diffusion plate 18 remains near the second diffusion plate 18, causing a delay in the transfer time, during which time they collide with each other, causing disturbance in the flow, and causing them to be diffused and mixed with each other. is the same as above.

In this way, the second agent C and the third agent C, which are made up of the first agent A and the second agent B, which have been diffused and mixed with each other in advance, diffuse into each other and come to exist simultaneously in the same basin. The agent passes through the second resin passage hole 19 of the second diffusion plate 18 and flows into the following static mixer 3 under the rectifying action of the rectifying protrusion 18a. Here, the resin is completely mixed by division, rotation, and reverse rotation for each section, and is injected from the nozzle portion at the tip.

In the above embodiment, each diffusion plate 10, 1
Although the configuration has been described in which the preliminary diffusion plates 12 and 20 are provided on the upstream side of the Boards 12, 20
Of course, you can omit it.

In addition, in this embodiment, the case of three drugs was explained, but in the case of four drugs, five drugs, etc., a configuration may be adopted in which a diffusion section is further added. For example, in the case of four drugs, the structure shown in FIG. As shown in , a third diffusion section 23 is added. That is, a fourth drug supply pipe 25 is provided concentrically around the outer periphery of the three-drug transport pipe 24 connected to the second diffusion section 5, and a third dividing hole 26 is bored at the tip of the three-drug transport pipe 24. A third diffusion plate 27 having a third resin passage hole 28 is provided in the fourth agent supply pipe 25 so as to be in contact with the tip of the three agent transport pipe 24 . Reference numeral 29 denotes a third preliminary diffusion plate in which a resin passage hole 30 is bored.

In the above configuration, the three drugs A+B+C transported through the three-drug transport pipe 24 and the fourth drug D transported through the fourth drug supply pipe 25 are sufficiently diffused and mixed with each other in the third diffusion section 23. The agents are simultaneously present and flow into the subsequent static mixer 3.

As described above, according to the present invention, in a liquid resin injection molding machine that includes a static mixer inside a mixing cylinder, a first molding machine having a first dividing hole at the tip end on the upstream side of the static mixer is provided. A agent supply pipe and a second agent supply pipe are provided concentrically, and a first diffusion plate having a first resin passage hole is disposed in the second agent supply pipe so as to abut against a tip of the first agent supply pipe. Further, a third agent supply pipe is provided on the outer periphery of the two-drug transport tube connected to the second agent supply pipe via a first diffusion plate, and a third agent supply pipe is provided at the tip of the two-drug transport pipe. A second diffusion section comprising a second split hole formed therein and a second diffusion plate having a second resin passage hole in the third agent supply pipe so as to be in contact with the tip of the second agent transport tube. Due to the structure in which the first agent is provided, the first agent supplied from the first agent supply pipe collides with the center of the first diffusion plate, is divided by the first dividing hole, flows outward, and then enters the first diffusion plate. Since the resin is directed to the first resin passage hole of the plate, there is a delay in the transfer time during this time.

On the other hand, the second agent in the second agent supply pipe collides with the non-porous portion of the first diffusion plate, reverses its flow and detours, and then heads toward the first resin passage hole, so a transfer delay time occurs during this time. Then, within this transfer delay time, the two drugs collide with each other, cause severe disturbance, and diffuse into each other, so that both drugs are mixed in a state where they exist simultaneously and flow into the two-drug transport pipe.

Next, the two agents reach the second diffusion section and collide with the second diffusion plate, causing a delay in the transfer time, as described above.

Further, the effect of delaying the transfer time of the third agent supplied from the third agent supply pipe by the second diffusion plate is similar to that described above.

In this way, the two agents consisting of the first agent and the second agent, both of which have a delay in their transfer time, and the third agent collide with each other and diffuse, creating a state in which the three agents exist simultaneously in the same area. The mixture is sufficiently premixed in advance until the mixture is completely dissolved, and the mixture is introduced into the subsequent static mixer in a state in which uneven mixing caused by misalignment of the supply pump during supply has been completely eliminated. This has the excellent effect of making it extremely effective.

In addition, since the split holes in the first and second agent supply pipes and the second agent transport pipe in each diffusion section are opened at positions that do not align with the resin passage holes in the diffusion plate, the split flow from the division holes may not pass through the resin passage holes. There is no short-circuit distribution,
Retention in the vicinity of the diffuser plate can be realized more effectively, and the mixing effect becomes more sufficient.

In addition, by providing a preliminary diffusion plate upstream of the diffusion plate as necessary, it is possible to prevent the second or third agent from directly passing through the resin passage hole of the diffusion plate, and the preliminary diffusion plate The second or third agent that has passed through the resin passage holes collides with the non-porous portion of the diffusion plate and reverses its flow, making the transfer time delay effect more effective.

Moreover, there is an advantage that it is possible to easily handle the mixing of multiple liquid drugs such as four drugs, five drugs, etc. by simply adding a diffusion section having the same structure.

Moreover, since the diffuser plate has a structure that does not have any moving parts, it does not interfere with the features of static mixer injection molding machines that do not have moving parts, and the structure is simple and there are fewer failures. It is easy to maintain, completely eliminates mixing unevenness during the supply of three drugs, and is extremely useful in practical use as a static mixer system.

[Brief explanation of drawings]

The figure shows an embodiment of the invention.
The figure is a perspective sectional view of one embodiment of the present invention, FIG. 2 is a sectional view taken along the line XX in FIG. 1, and FIG.
FIG. 4 is a perspective sectional view of another embodiment. 1...Mixing cylinder, 3...Static mixer,
4...First diffusion part, 5...Second diffusion part, 6...First agent supply pipe, 7...Second agent supply pipe, 8...First annular space, 9...First divided hole, 10...First diffusion plate, 11...First resin passage hole, 14...Two agent transport pipe, 15...Third agent supply pipe, 16...Second annular space, 17...Second dividing hole, 18 ...Second diffuser plate,
19...Second resin passage hole.

Claims (1)

[Claims] 1 In a liquid resin injection molding machine comprising a static mixer 3 in a mixing cylinder 1, a first agent supply pipe 6 is provided upstream of the static mixer 3.
A second agent supply pipe 7 is provided concentrically on the outer periphery of the first agent supply pipe 6, and first dividing holes 9 are bored at appropriate intervals at the distal end of the first agent supply pipe 6. A first diffusion plate 10 is provided in the interior so as to be in contact with the tip of the first agent supply pipe 6, and the first diffusion plate 10 has a first resin passage hole opening at a position not aligned with the first dividing hole 9. 11, and further connect a second agent transport pipe 14 to the second agent supply pipe 7 via a first diffusion plate 10,
A third agent supply pipe 15 is provided concentrically around the outer periphery of the two-drug transport pipe 14, and a second split hole 17 is bored at the tip of the two-drug transport pipe 14. A second diffusion plate 18 is provided in contact with the tip of the two-drug transport pipe 14, and the second diffusion plate 18 has a second resin passage hole 19 that opens at a position that is not aligned with the second divided hole 17. An injection molding machine for liquid resin characterized by having a perforation.