JP2019166840A - Mold apparatus for resin molding - Google Patents

Abstract

To provide a mold apparatus for resin molding, which has a novel energy-saving structure, and also has a simple structure, can facilitate heating of a mold by minimizing a steam chamber, and can shorten a molding cycle time.SOLUTION: There is provided a mold apparatus that is configured by: arranging a first steam chamber between a back side of a male mold 35 and a base 301 of a first plate 3; arranging a second steam chamber between a back side of a female mold 25 and a frame 21 of a second plate 2; filling a foamable resin into a molding space formed by a front side of the male mold 35 and a front side of the female mold 25; and molding a resin molded product 200 by heating and fusing the formable resin in the molding space by sending superheated steam to the first steam chamber and the second steam chamber, and a flow path 304 for sending superheated steam to the first steam chamber is arranged along the base 301 of the first plate.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a resin molding die apparatus.

  In general, foamed polystyrene is used for packaging materials for agricultural and fishery containers and equipment. Polystyrene foam beads (EPS) absorbs hydrocarbon gas into polystyrene beads, softens the resin by applying high-temperature steam to it and foams it by applying pressure, fuses the foamed beads, cools them, and cools them. The shape of The foamed polystyrene packaging material is light in weight, has a buffering property and a heat insulating property, and has features such as little influence on the environment.

  In Patent Document 1, as shown in FIG. 7, as a conventional technique, “inner wall bodies 500 and 600 forming a mold cavity 700, steam supply pipes 51 and 61, cooling water pipes 520 and 620, and discharge pipes 530 and 630 are connected. The box-shaped outer wall bodies 540 and 640 are formed, and the entire space between the inner wall bodies 500 and 600 and the outer wall bodies 540 and 640 is formed as steam chambers 550 and 650 (detailed explanation of the invention). There is a description, and as a problem of the prior art, “in order to raise the temperature of the entire mold, it requires extra steam, a large amount of steam has to be used, as well as a molding cycle for heating the entire mold There was a description that there was a drawback that took a long time (detailed explanation of the device). Therefore, in Patent Document 1, regarding the foam resin molding die device, “a wall body substantially along the shape of the mold is formed with a gap between each mold part around each mold part forming the mold cavity. A steam chamber configuration (claim 1) has been proposed.

  In Patent Document 2, “a concave unit having a concave mold and a concave housing that holds the concave mold, and having a concave chamber formed in the concave housing on the back side of the concave mold, a convex mold and a convex housing that holds the convex mold. And a convex unit having a convex chamber formed in the convex housing on the back side of the convex mold, and combining the both units, expandable resin particles in a molding space formed by the concave mold and the convex mold The mold apparatus for in-mold foam molding is obtained by heating and foaming and fusing the expandable resin particles in the molding space to obtain a molded product, wherein the concave mold is in contact with the concave housing. The concave front side end is supported in a cantilever shape so as to be a free end, and a front opening opening toward the convex unit side is formed between the concave free end and the concave housing. Combined with convex In state, to close the front opening in the convex unit, the configuration of the concave chamber was airtightly (Part claim 1) "it is described.

  Patent Document 3 states that “a plurality of concave mold members are arranged on one of a pair of mold mounting plates that are fixed to the frame and are opposed to each other, and a molding cavity is formed on the other side when the mold is closed. A foam molding mold in which a plurality of corresponding convex mold members are arranged so as to obtain a plurality of foam molded products by one cycle molding operation, wherein the concave and convex mold members A configuration in which casings are provided at intervals on the back surface to form independent individual service chambers, and services can be individually supplied to and discharged from the individual service chambers (claim 1). Are listed.

Japanese Utility Model Publication No. 52-128673 JP 2010-120336 A JP 2010-023499 A

  However, there are still many unsolved problems in the known resin mold apparatus.

  The mold apparatuses described in Patent Documents 1 to 3 all have a complicated mold structure in order to make the steam chamber small, and have a problem that the mold cost and the maintenance cost become very high. However, if the mold structure is simplified, there is a disadvantage that a large amount of steam must be used as in the conventional example shown in FIG. 7, and the molding cycle time is long due to heating of the entire mold.

  In view of such circumstances, the object of the present invention is to provide a resin molding die having a novel energy-saving structure, which has a simple structure but can reduce the steam chamber to facilitate heating of the mold and shorten the molding cycle time. To provide a mold device.

  The mold apparatus for resin molding according to the present invention includes a male mold and a female mold that are arranged to face each other and perform mold opening and closing operations, a first plate to which the male mold is attached, A plurality of first steam chambers provided for each male mold are provided between the first plates, and in a molding space formed by the front side of the male mold and the front side of the female mold A mold apparatus for filling a foamable resin and sending a superheated steam to the first steam chamber to heat and melt the foamable resin in the molding space to mold a resin molded product, The plate includes a base connected to the lower end of the male mold, and a flow path for sending superheated steam or drain is provided along a state in contact with the lower portion of the base.

  According to the present invention, the male-side steam chamber (first steam chamber) can be made smaller to facilitate heating of the mold and shorten the molding cycle time.

The channel is preferably linear. This is because heat loss in the flow path of the superheated steam can be suppressed by shortening the distance of the flow path. For example, the flow path may have a structure in which a hole for releasing vapor is opened in the tube body.

  The present invention is characterized in that the flow path is open and serves as both a flow path for sending superheated steam and a flow path for discharging drain. Here, Kai is a ditch.

  According to the present invention, the flow path for sending the superheated steam and the flow path for discharging the drain can be used together, so that the structure is simpler. And since the flow path is open, it becomes a structure which is easy to discharge | release superheated steam in a steam chamber, and is easy to discharge | emit drainage outside a machine.

  In the present invention, the first plate is provided with a first steam pipe for sending superheated steam to the first steam chamber and a first discharge pipe for discharging drain from the first steam chamber. The second plate is filled with the foamable resin, the second steam pipe for sending superheated steam to the second steam chamber, and the drain is discharged from the second steam chamber. A second discharge pipe is provided.

  According to the present invention, the foamed resin can be easily filled and the molded product can be easily taken out from the mold.

Examples of the material of the male mold and the female mold include aluminum, iron, copper, and alloys thereof. A vent hole is formed in the male mold and the female mold.
The male mold and the female mold are manufactured by casting, forging, cutting, pressing, and other known processing methods.

  Examples of the material of the first plate and the second plate include aluminum, iron, copper, and alloys thereof. The frame constituting these plates is preferably an iron-based metal. Compared to aluminum, iron is superior in strength and rigidity, and the material cost is low. On the other hand, from the viewpoint of heat conduction, aluminum has a lower specific heat than iron and is excellent in thermal conductivity, so that heating and cooling are smoothly performed. Therefore, in order to match the advantages of both, it is preferable to spray the frame on the iron-based metal with aluminum. Thereby, it is excellent in intensity | strength and rigidity and heating and cooling will be made smoothly.

  The male mold and the female mold are configured so that the mold is closed by clamping with a power of steam pressure, hydraulic pressure, pneumatic pressure, electric motor, etc. Mechanism can be applied.

  It is preferable that the second plate is provided with an eject mechanism for taking out the molded resin (resin molded product). The eject mechanism includes a structure in which an eject pin is pushed out by power of hydraulic pressure, pneumatic pressure, an electric motor, etc., a resin molded product is pushed out, a resin molded product is pushed out by an air discharge force, or the male mold is vibrated slightly. The structure etc. which extrude a molded article are mentioned. A known mechanism can be applied as the ejection mechanism.

  According to the mold apparatus for resin molding of the present invention, the steam chamber (first steam chamber) on the male mold side can be made small to facilitate heating of the mold, shorten the molding cycle time, and send the superheated steam. Since the path and the flow path for discharging the drain can be used together, the structure is simpler. And since the flow path is open, it becomes a structure which is easy to discharge | release superheated steam in a steam chamber, and is easy to discharge | emit drainage outside a machine.

  According to the present invention, a resin molding die apparatus having a novel energy saving structure that can reduce the steam chamber to easily heat the die and shorten the molding cycle time while having a simple structure.

It is a top view which shows the resin mold apparatus of embodiment to which this invention is applied. It is AA sectional drawing which shows the metal mold apparatus of the said embodiment. It is a front view which shows the metal mold apparatus of the said embodiment. It is BB sectional drawing which shows the metal mold apparatus of the said embodiment. It is a right view which shows the metal mold apparatus of the said embodiment. It is a structural diagram which shows operation | movement of the metal mold | die apparatus of the said embodiment. It is structural drawing which shows the conventional metal mold apparatus.

  The best mode for carrying out the present invention will be described below based on examples. It should be noted that the present invention is not limited to the following embodiments, and known modifications can be made within a range substantially the same as or equivalent to the present invention.

(Embodiment)
FIG. 1 is a plan view showing a resin molding die apparatus according to an embodiment to which the present invention is applied. FIG. 2 is a cross-sectional view taken along line AA of the mold apparatus 1 shown in FIG. FIG. 3 is a front view of the mold apparatus 1. The front view and the rear view are the same or symmetrical. 4 is a BB cross-sectional view of the mold apparatus 1 shown in FIG. FIG. 4 is a right side view of the mold apparatus 1. The right side view and the left side view are the same or symmetric. FIG. 6 is a structural diagram showing the operation of the mold apparatus 1 of the present embodiment. FIG. 6 shows a state where the mold is opened.
The mold apparatus 1 of this embodiment is a mold apparatus for resin-molding a polystyrene foam container 200 as a food tray. In the example shown in FIG. 1, four foamed polystyrene containers 200 are simultaneously formed. In some cases, two, six, or eight foamed polystyrene containers 200 may be molded simultaneously.

  The mold apparatus 1 of the present embodiment has a configuration in which a first plate 3 and a second plate 2 are arranged to face each other and perform mold opening and closing operations. A base 301 is attached and fixed to the frame 31 of the first plate 3, and a male die 35 is attached and fixed to the base 301. A female die 25 is attached and fixed to the frame 21 of the second plate 2 ( 2 and 6). A first steam chamber S31 is provided between the back side of the male die 35 and the base 301 of the first plate, and a second steam chamber S21 is provided between the back side of the female die 25 and the second plate 21. And a foaming resin is filled in a molding space (cavity) formed by the front side of the male die 35 and the front side of the female die 25, and the first steam chamber S31 and the second steam chamber are filled. By sending superheated steam to S21, the foamable resin is heated and fused in the cavity S1 to mold the resin molded product 200 (FIGS. 2 and 6).

In this embodiment, the base 301 of the first plate is formed with a slit, and a flow path 304 is provided in accordance with the slit, and a linear flow path 304 is disposed across the two male molds 35. (FIGS. 2 and 4). The flow path 304 is open and serves as both a flow path for sending superheated steam and a flow path for discharging drain.
In the example shown in FIGS. 1 to 6, a pipe 305 for sending superheated steam to the first steam chamber S <b> 31 is connected to the flow path 304 in the first plate 3, and drainage is discharged from the pipe 305. It is the composition which becomes. Reference numeral 306 denotes a water cooling pipe. The second plate 2 is provided with a filling nozzle 207 for filling the foamable resin and a pipe 205 for sending superheated steam to the second steam chamber S21. Drain is discharged by a drain pipe (not shown). The Reference numeral 206 denotes a water-cooled pipe. In addition, it is not restricted to this example, A steam pipe and a drain pipe may be separately arranged separately.
The filling nozzle 207 is a service nozzle and is also used for injecting a gas such as a hydrocarbon gas. A vent hole is formed in each of the male mold 35 and the female mold 25. Further, the second plate 21 is provided with an eject mechanism (eject pin 208) for taking out the molded resin (resin molded product) 200 (FIG. 2).

6A shows the second plate 2, FIG. 6B shows the expanded polystyrene container 200, and FIG. 6C shows the first plate 3.
According to the present embodiment, since the flow path 304 for supplying superheated steam is disposed across the plurality of male molds 35, 35, the fluid circuit is simplified, and the steam chamber (first steam) on the male mold side is simplified. Chamber) S31 can be reduced to facilitate heating of the mold and shorten the molding cycle time. In the example of FIG. 6C, the volume of the first steam chamber S <b> 31 is as small as possible close to the volume of the male mold 35. The mold apparatus 1 forms, for example, the fish box 200 with foamed polystyrene (FIG. 6B).

  According to the present embodiment, the flow path for sending the superheated steam and the flow path for discharging the drain need only be one flow path 304, so that the structure is simpler (FIGS. 2 to 4). And since the flow path 304 is open, it becomes the structure which is easy to discharge | release superheated steam in a 2nd steam chamber, and is easy to discharge | emit drain to the exterior.

  The frame 31 of the first plate is sprayed with aluminum on an iron-based metal, thereby being excellent in strength and rigidity, and being smoothly heated and cooled (FIG. 2). Reference numerals 2101, 3101, and 3102 shown in FIG. 2 indicate meat theft (a cut portion of the frame) for reducing the weight and reducing the heat capacity.

  The male mold 35 and the female mold 25 are manufactured by die casting, for example. The male mold 35 and the female mold 25 are configured so that the mold is closed by clamping with a power of steam pressure, hydraulic pressure, pneumatic pressure, electric motor or the like, and the mold is opened after resin molding. Applicable.

  According to this embodiment, the resin molding die apparatus having a novel energy-saving structure that has a simple structure but can reduce the steam chamber to easily heat the die and shorten the molding cycle time. Therefore, a homogeneous foamed resin molded product can be produced with high efficiency and energy saving.

  As described above, the present invention is not limited to the embodiment described above. The number of foamed resin molded products can be set arbitrarily as well as four, two, six, eight, etc., and the mold can be easily exchanged on the same plate. Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

1. Mold apparatus for resin molding of the present invention,
2 second plate, S21 second steam chamber,
3 1st plate, S31 1st steam chamber,
25 female,
35 male,
301 base,
304 channel (opening),
200 Resin molded product (Styrofoam container)

Claims (3)

  A male mold and a female mold that are arranged to face each other and open and close, a first plate to which the male mold is attached, and a second plate to which the female mold is attached, A first steam chamber is provided between the two plates, a second steam chamber is provided between the female back side and the second plate, the male front side and the female front side. The foaming resin is filled in the molding space formed by the side, and the foaming resin is heated and fused in the molding space by sending superheated steam to the first steam chamber and the second steam chamber. A mold apparatus for molding a molded product, wherein the first plate has a linear base connected to the lower end of the male mold, and the flow path for sending superheated steam or drain is in contact with the lower part of the base. A mold apparatus for resin molding characterized by being provided.   A male mold and a female mold, which are arranged to face each other and operate to open and close the mold, and a first plate to which the male mold is attached, are provided for each male mold between the back side of the male mold and the first plate. A plurality of first steam chambers are provided, a foaming resin is filled in a molding space formed by the male front side and the female front side, and the first steam chamber is superheated steam. Is a mold apparatus for forming a resin molded product by heat-sealing the foamable resin in the molding space, and the first plate includes a linear base connecting the lower ends of the male molds, A mold apparatus for resin molding, wherein a flow path for sending superheated steam or drain is provided along a state in contact with a lower portion of the base. The mold apparatus for resin molding according to claim 1 or 2, wherein the flow path is open and serves as both a flow path for sending superheated steam and a flow path for discharging drain.