JPS60131214A - Reactive injection molding machine - Google Patents

Abstract

PURPOSE:To keep pressing and a vacuum, and to manufacture a molded shape with few bubbles by interposing a joining block brought to a hermetic state between two tanks in which two liquids are mixed with each other, and an injection nozzle. CONSTITUTION:Joining sections 13-15 for mixing two liquids having structure resisting pressure and a vacuum, a heater 19 and a heating medium 18 are mounted among two cylinders 3, 4 with pressure pumps 5, 6 and an injection nozzle 17 from which a mixed liquid in which the two liquids are mixed is injected. The whole is joined with an evacuated mold, and all paths except the cylinders 3, 4 are evacuated. Since all paths are evacuated, bubbles are not rolled in on the mixing of the two liquids, and a more uniform reaction curing material is obtained. There are few bubbles in a product to be acquired, and a molded shape having excellent curing molding characteristics is manufactured.

Description

[Detailed Description of the Invention] In the field of industrial application, the present invention relates to a reactive injection molding machine, and in particular, a reactive injection molding machine that uses a small, articulated robot such as an orthogonal horizontal and vertical robot.
It is used as an online injection molding machine as a substitute for thermoplastic injection molding machines, and has 3 pages.

Conventional configuration and problems Conventional reactive injection molding machines are large, but the piping route connecting the mixing head and tank is long, making it impossible to control the entire machine at a uniform temperature. . or,
Since the mixing head and the mold are often joined together and collision mixing is performed, there is a problem that air bubbles are inevitably drawn into the liquid phase or the molding material. In other words, the biggest challenges were controlling the temperature of the entire reactive injection molding device and removing air bubbles from the molded product.

Purpose of the Invention The purpose of the present invention is to miniaturize a reactive injection molding device and to devise a corresponding bonding device that can be used for both pressurization and vacuum, and to improve the accuracy of temperature control from the storage container to the mixing device. .

Components of the Invention The reactive injection molding machine of the present invention comprises at least two or more containers containing reactive liquid compositions, a pump having an external drive source for feeding the liquid composition in fixed quantities, and a pump for feeding the liquid compositions. It consists of a mixing device that mixes the mixed liquid, a connecting device that connects the mixing device and the container, and a heating device that controls the temperature of all these devices.

DESCRIPTION OF EMBODIMENTS The reactive injection molding machine of the present invention comprises a cylindrical container 3,
4 is filled with liquid A (mixture 1 of caprolactam and an alkali polymerization catalyst) and liquid B (mixture 2 of caprolactam and polyol copolymer), and if necessary, heat quiz 9, 1O is applied from the external tank side. It is also possible to replenish from the stop pulp 11.12. A predetermined amount of these liquids is applied to the piston 6.6 by air from outside.
Alternatively, the pressure 22,23 is transmitted to the shaft by a hydraulic pump and the liquid is fed. These liquids pass through a stopper (lube 7°8), are mixed through joint blocks 13, 14, and 16, are completely mixed by a static mixer 16, and are injected from an injection head 17 into a mold. All of them were immersed in a silicone heating medium 18, and the heating medium was heated by a heater 19 for 6 pages, and the temperature could be set to a predetermined temperature using a stirring blade connected to a motor. The temperature could only be maintained at ±1°C due to the small amount of heat, but by adjusting the amount of heat medium and the cylinder diameter, even more precise temperature control is possible. Since it is a one-to-one injection, the pressure is 22.2
3 can also be combined with the same pressure generator.

In the reactive injection molding machine of the present invention, by providing a vacuum suction port in a part of the mold and connecting it to the injection port of the reactive injection molding machine, it is possible to evacuate the entire path except for the container cylinder. can. In other words, by evacuating all paths, air bubbles will not be involved even at the initial stage of impact mixing, and a more uniform reaction-cured material can be obtained. It is necessary to have a structure that can withstand For this purpose, the welding apparatus of the present invention has the following features:
The joint blocks shown in Figures 3 and 4 are optimal. As shown in FIG. 2, the joining block 13 has a welded part and a joined part, and the joined part has a tapered part 26 centered on the liquid path 246mm, and the joined part has a tapered part 26 centered on the liquid path. It has a concave curved surface 25 and a vacuum backing 27 on the outside thereof. These blocks can be joined by overlapping them as shown in FIG.
O allows for close contact and prevents leakage. Furthermore, when a vacuum is drawn, airtightness is maintained by the backing 27. In addition, Figure 4 shows the joining block 1 for heating two liquids.
6 is shown. Holes 32, 33, and 33 for disassembly and maintenance are provided at all locations perpendicular to the perpendicular liquid path 31.
34 are provided. These holes are kept secret with a sealant. In particular, the silicone oil on the outside is also a factor in maintaining confidentiality.

Note that the maintenance hole 34 can also be used as a connection port for introducing cleaning liquid or gas.

In addition to the effects of the invention, the reactive injection molding machine of the present invention is a molding machine that can be used for both pressurization and vacuum, has a slightly inferior molding cycle, and produces molded products with few air bubbles and excellent hardening molding properties. Can be done.

In addition, the joint block and the entire device can be easily disassembled, even if liquid materials with violent reactions harden in the device piping.

It is an excellent product that can be removed.

Furthermore, when increasing the cylinder capacity and molding hundreds of small molded products, it is possible to completely eliminate piping and connecting fittings in the entire equipment, making it compact and capable of handling all temperatures in the heat medium. This is a completely superior reactive injection molding machine that can be controlled, allowing even better reaction control.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a reactive injection molding machine that is an embodiment of the present invention, Figures 2a and b are a half-sectional front view and a half-plan view of a joint block, and Figure 3 is a stack of two joint blocks. The combined front view and FIG. 4 are half-sectional front views showing the joined state of the joint blocks, which are the mixed liquid portion of the present invention. 3.4... Container (cylinder), 5.6...
... Liquid pump (histone), 7.8 ... Stop valve, 13, 14.15 ... Joining device, 16 ... Static mixer, 17 ...
... Injection nozzle, 18 ... Heat medium, 19 ...
...Heater, 2o...Stirring blade, 25...
... Convex spherical convex surface, 26 ... Tapered concave portion, 27 ... Heat-resistant banking, 28 ...
Bolt holes, 32.33.34...Maintenance holes. Name of agent: Patent attorney Toshio Nakao and one other person
N-kei

Claims (1)

[Scope of Claims] 0) At least two or more containers containing a reactive liquid composition, a pump having an external drive source for delivering a surplus amount of the liquid composition, and a pump for transporting the delivered liquid. A connecting device for connecting a mixing device for mixing and the container, these containers, and a pump mixing device. A reactive injection molding machine having a connecting device and a heating device for temperature control. (2) The container has a cylindrical shape having two or more stop tabs, and has a piston on one side. Reactive injection molding machine. (3) A reactive injection molding machine according to claim 1, in which the pump for feeding a fixed amount of liquid is controlled by moving the position of a piston. Patent request 21° which is a mixing head that can be used as a Tsuku mixer or as a simple impingement mixer.
- Reactive injection molding machine according to item 1 of the scope of the request. (5) The connecting device has a block or cylindrical shape with piping inside, and the part to be joined is a tapered concave part, and the joint part is an original curved surface with a piping hole in the center and a convex periphery. A reactive injection molding machine according to claim 1, which has a heat-resistant backing groove made of copper, brass, or Teflon for vacuum use on its outer periphery, and has a shape that allows tightening of bolts around the periphery. @) The heating device has a heat insulator on the outside and a heater on the inside.
2. The reactive injection molding machine according to claim 1, wherein the container, the mixing device, and the bonding device are all heat medium containers impregnated with metal powder or silicone-based heat medium.