JPS6227377Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sandwich molding machine, in particular, which injects two types of resin materials alternately or simultaneously to produce skin-core molded products and molded products with multicolored patterns such as marble patterns. This relates to a sandwich molding machine for obtaining.

In sandwich molding of different materials, if there is a large difference in melting temperature between the resin forming the skin layer and the resin forming the core layer, each resin may be kept at different temperatures until just before it is filled (injected) into the mold. Adjustments need to be made. However, with conventional equipment, it is only possible to control the same temperature from the nozzle tip to the dissimilar material supply device, and therefore the heating temperature of the material has to be adjusted to the side with a higher melting temperature. As a result, materials with a low melting temperature are placed in a high temperature state, which may cause problems such as deterioration of physical properties, or a decrease in melt viscosity, which may cause problems in setting the molding conditions when performing sandwich molding. There were problems such as difficulty in

In view of the above points, the present invention is based on a dissimilar material (resin).
The object of the present invention is to provide a sandwich molding machine in which the temperatures of different materials can be adjusted separately until they are combined, and the portions where such different materials are mixed is minimized.

The present invention will be explained in detail below based on embodiments shown in the drawings.

First, in the drawing, 1 and 2 are conventionally known injection cylinders, and each has a screw 1 inside.
a, 2a, by heating with band heaters 1b, 2b and rotating the screws 1a, 2a, a predetermined resin material is heated and fluidized, and the screws 1a, 2a are moved forward under pressure, The liquid is discharged through nozzles 1c and 2c arranged at the tips of the. Note that here, 1 is a first injection cylinder and 2 is a second injection cylinder, but the resin materials heated and fluidized in these cylinders include different materials such as the resin itself and different compounding agents. will be used.

Reference numeral 3 denotes a manifold plate, which guides the fluidized resin material discharged from the nozzles 1c and 2c of the injection cylinders 1 and 2, respectively, so as to merge them into a first resin passage 3a and a second resin passage 3b. have. Moreover, in these two resin passages 3a and 3b, a torpedo 4,
5a and 5b are provided. The cartridge heaters 6 arranged around the two resin passages 3a, 3b and the cartridge heaters 7 with thermocouples arranged inside each torpedo 4, 5a, 5b control the resin passages 3a, 3b, respectively. Each of the fluidized resin materials guided and circulated through 3b is heated separately. In addition,
Each cartridge heater 7 with a thermocouple is connected to a temperature controller (not shown), so that the heating temperature of each fluidized resin material is controlled.

Furthermore, the nozzle 1 of the first resin passage 3a
A shut-off piston 8 is fitted into the portion communicating with the first resin passage 3a so as to be slidable in its axial direction, and its flow causes an annular opening in the side wall of the communicating portion of the first resin passage 3a. Second resin passage 3
b can be opened and closed. More specifically, due to the abutment or separation between the distal end surface of the shut-off piston 8 and the inner surface of the nozzle, the annular opening of the second resin passage 3b and the subsequent outer peripheral surface passage of the distal end of the shut-off piston 8 are formed. 8b nozzle 11
Communication to the network is either blocked or allowed. Further, the central portion of the shut-off piston 8 located in the first resin passage 3a is made smaller in diameter with respect to the piston base to form a torpedo-like resin guide passage 8a, and furthermore, the piston 8 The resin material is introduced into the center, and the resin material flowing through the first resin passage 3a is discharged from the tip of the shut-off piston 8 through the resin discharge passage 8b in the axial direction. A recess 8c with a spherical bottom surface is formed in the axial direction of the tip of the shut-off piston 8, and a ball 9 is rotatably interposed in the recess 8c. A ball check nozzle 11 is provided along with a nozzle portion 10 provided in front of the tip of the
Configure. Note that 10a is a stopper that prevents the ball 9 from moving forward and prevents the nozzle hole from being blocked by the ball 9, and a torpedo 4,
A cartridge heater 7 with a thermocouple similar to that of 5a and 5b is provided, and is connected to a temperature controller (not shown). Band heaters 14 and 15 are also provided to heat the resin confluence section and nozzle 11.
are provided for each.

The shut-off piston 8 is connected at its base to a piston 13 of a hydraulically operated shut-off cylinder 12, and the shut-off piston 8 is moved by moving the piston 13 by introducing pressure oil from a hydraulic pump. to move it left and right. The amount of movement of the shut-off piston 8 in the axial direction is controlled by abutting an annular flange 8e provided at the base of the piston 8 against a fixing member.

Therefore, in a molding machine having such a configuration, the fluidized resin material supplied from the first injection cylinder 1 and the fluidized resin material supplied from the second injection cylinder 2 are separated from each other by the manifold plate 3. In the resin passages 3a, 3b, the heaters 6, 7
The optimum heating temperature can be adopted depending on each resin material.
This has made it possible to eliminate all problems such as deterioration of the physical properties of the resin material and decrease in melt viscosity, making it difficult to set molding conditions.

Further, in the above-mentioned molding machine, since the switching mechanism for the two resin passages 3a and 3b is located close to the nozzle 11, there is a feature that the area where the two types of resin materials are mixed can be reduced. That is, the two types of resin materials guided through the resin passages 3a and 3b are moved by the hydraulic action of the shut-off cylinder 12 to move the shut-off piston 8.
They are simultaneously or alternately supplied and immediately injected from the nozzle 11 into a predetermined mold, and as shown in the figure, the shut-off piston 8 is moved to the left so that the left end tapered surface of the piston 8 forms the nozzle part. 1
0, the second resin passage 3b is blocked by the piston 8, and the supply of resin material from the second injection cylinder 2 is blocked, while the first The resin material to which the discharge pressure of the injection cylinder 1 is applied displaces the ball 9 through the first resin passage 3a, the guide passage 8a, and the discharge passage 8b, reaches the nozzle 11, and is injected from the nozzle 11 into a predetermined mold. It will be done. On the other hand, when the shut-off piston 8 is moved rightward in the figure, the left end tapered surface of the piston 8 and the nozzle portion 1
A gap is created between the second resin passage 3b and the tapered surface of 0, through which the resin material is supplied to the nozzle 11 from the second resin passage 3b. By supplying the resin material from the second resin passage 3b, the ball 9 is moved to the right within the recess 8c and is pressed against the spherical bottom surface, so that the discharge passage 8b opening to the spherical bottom surface is Since this blockage prevents the supply of resin material from the first injection cylinder 1 to the nozzle 11, the resin material injected from the nozzle 11 is now the same as that supplied from the second injection cylinder 2. Only. Therefore, the two types of resin materials supplied from the first and second injection cylinders 1 and 2 are alternately injected by the alternate movement of the shut-off piston 8 in the left and right directions. . In addition, as mentioned above, the shutoff piston 8
is moved to the right and the second resin passage 3b
is in communication with the nozzle 11,
If the resin material pressure in the first resin passage 3a is made higher than that in the second resin passage 3b, the resin materials in the two resin passages are simultaneously supplied to the nozzle 11, and simultaneous injection is performed. It is. In this way, the combination of the movement of the shut-off piston 8 and the ball check 9 makes it extremely easy to cover and open the two resin passages 3a and 3b, which not only speeds up the operation, but also allows the two resin passages to be It becomes possible to bring the confluence of the resin passages 3a and 3b closer to the nozzle tip,
This makes it possible to reduce the amount of mixed materials (two resin materials) and create a clearer sheath/core structure or pattern.

Since the present invention is constructed as described above, it is possible to easily and quickly switch between two types of resin materials with a simple mechanism, and also enables simultaneous injection. It is possible to separately adjust the temperature until the resins (resins) are fused together, and furthermore, it is possible to reduce the mixing area of such different materials as much as possible.

[Brief explanation of the drawing]

The drawing is a sectional view of a molding machine showing an embodiment of the present invention. 1: first injection cylinder, 2: second injection cylinder, 3a: first resin passage, 3b: second resin passage,
4, 5a, 5b: Torpedo, 6: Cartridge heater, 7: Cartridge heater with thermocouple, 8: Shut-off piston, 9: Ball, 1
0: Nozzle part, 11: Ball check nozzle, 1
2: Shut-off cylinder, 13: Cylinder.

Claims (1)

[Claims for Utility Model Registration] (1) A first injection cylinder that heats and fluidizes a predetermined resin material and supplies the same; and a first injection cylinder that heats and fluidizes another resin material different from the predetermined resin material. a second injection cylinder for supplying the resin materials, two resin passages for respectively guiding the two types of resin materials supplied from the first and second injection cylinders, and the resin materials guided by the two resin passages; a manifold plate having heating means for heating each separately; a nozzle provided at the confluence of two resin passages of the manifold plate for injecting resin material into a predetermined mold; and at the confluence It is characterized by including a shut-off mechanism that operates to alternately close the two resin passages or open both at the same time to guide the two types of resin materials alternately or simultaneously to the nozzle. Sanderutsch molding machine. (2) The shut-off mechanism is slidably fitted into a portion of one of the resin passages that communicates with the nozzle, and the resin is arranged in an axial direction for guiding the resin material supplied through the resin passage to the nozzle. A shut-off piston having a discharge passage and an annular flange for regulating the amount of movement in the axial direction, and an opening of the resin discharge passage disposed at a tip portion of the shut-off piston and opened at the tip portion. axial movement of the shut-off piston regulated by the annular flange causes the tip surface of the shut-off piston to come into contact with the inner surface of the nozzle. Alternatively, the utility model registration claim is such that introduction of the resin material supplied to the nozzle through the other resin passage that opens on the side wall surface of the one resin passage is prevented or allowed by being separated. A molding machine according to scope 1.