JPH0622924B2 - Molding method of composite foamed synthetic resin molded product and molding die - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for molding a composite foamed synthetic resin molded article and a molding die thereof, and more specifically, it is embedded in a state in which at least one surface in the length direction is exposed. Nailability and / or
Alternatively, a molding method of a composite foamed synthetic resin molded article in which a square member having good adhesiveness is flattened with a surrounding foamed synthetic resin substrate so as to be molded integrally, and a molding metal embodying the molding method Regarding the type.

[Conventional technology]

Conventionally, as a base material for a wall or a floor material for a western room, a square bar having a good nailing property and / or an adhesive property for attaching a finishing material is used in a foam synthetic resin substrate with at least one surface exposed in the length direction. Generally, a composite foam synthetic resin molded product embedded in is used.

Such a composite foam synthetic resin molded article is formed by forming a recess in a portion where a square bar is to be embedded in a foam synthetic resin substrate molded in-mold in a flat plate shape by cutting, and forming a recess in the recess. Separately formed square wood is installed and glued and fixed with adhesive, or the base is molded in a mold with a recess for inserting the square wood in advance, and then the square wood is placed inside the recess and bonded together It is made by adhering and fixing with a chemical.

[Problems to be solved by the invention]

Here, the pre-formed square bar is placed in the molding space of the mold and is not integrally molded with the base body. Normally, the square bar has low foaming as a material having good nailability and adhesiveness in consideration of the attachment of the finishing material. Although a synthetic resin molded product of is desired, the actual condition is that the temperature when the mold is cooled is set to about 40 to 60 ° C in view of the molding cycle and thermal efficiency of the mold, and this temperature is slightly below room temperature. If the square bar comes into contact with a high mold, the contact surface side of the square bar expands and the whole warps, and the mold is closed as it is, the raw material particles are filled in the molding space, and then heated to mold the molded product. For example, the entire surface exposed by the warp of the square bar does not adhere to the inner surface inside the mold, and some of the filled raw material particles enter the gap between the mold and the square bar, and the square bar surface of the molded product after molding May appear in a state where a part of the substrate is covered with However, after molding, the exposed backsides and sides of the timber are in a state of being covered with a foamed synthetic resin substrate that is a heat insulating material, and the heat generated during heating causes the temperature inside the timber to become higher than the inner surface of the timber, causing the molded article to warp. This is because

In addition, the applicant previously disclosed a composite foam molding apparatus disclosed in Japanese Patent Application No. 57-9251. Here, the rectangular material is closely contacted with the inner surface of the mold in the molding space of the mold. In order to hold the male mold surface, a pressing pin is fixedly provided on the male mold surface toward the female mold, or a rod of an air cylinder is erected on the male mold surface.

However, in this composite foam molding device, since the purpose is to embed the square bar in the base body with the surface in the length direction completely covered and integrally molded, even if this device is used, it is usually When closing the mold and filling the raw material, the so-called cracking filling is performed with a slight gap between the female mold and the male mold, and then the mold is completely closed, heated and cooled. Since this is used to mold the molded product, this fixed pressing pin may damage the square wood and the mold, and the cylinder rod protruding length of the cylinder rod when the cylinder rod is erected from the male mold surface. In addition to the problem that the height is adjusted, there is also a problem that the size of the mold is increased by attaching the air cylinder to the male mold.

However, what was invented in view of such a problem is a molding method of a composite foamed synthetic resin molded article of the present invention and a molding die thereof, which facilitates foam synthesis of a square bar without increasing the size of the die. At least one surface in the length direction of the resin base can be embedded in a completely exposed state, and even if there is variation in the dimensional accuracy of the square bar or warpage occurs, the desired The object is to obtain a composite foamed synthetic resin molded product in the state.

[Means for solving problems]

In order to achieve such an object, the first aspect of the present invention is to provide a foam synthetic resin substrate and a square bar between the inner surface of the female die and the surface of the male die when the female die and the male die are closed. In the female mold of a pair of molds in which the inner surface shape of the female mold and the surface shape of the male mold are formed so as to form a molding space of the composite foamed synthetic resin molded article. A square bar having good nailability and / or adhesiveness is arranged so as to be integrally embedded with at least one surface in the lengthwise direction exposed, and the male die is relatively close to the female die. As the mold is closed, at least one side surface of the square bar is elastically pressed by the pressing means elastically biased from the male mold direction to temporarily hold the entire exposed surface of the square bar in contact with the inner surface of the female mold, The mold is closed, the raw material particles are filled in the molding space, and both are integrally molded as it is. According to a second aspect of the present invention, there is provided a composite foamed synthetic resin molded article comprising a female die and a male die, and at least between the inner surface of the female die and the surface of the male die when the die is closed. The inner surface shape of the female mold so that a molding space of a composite foamed synthetic resin molded product, which is formed of a square material having a good nailing property and / or an adhesive property and a foamed synthetic resin substrate, which exposes one surface in the length direction, is formed In addition, the pressing means is formed from the male die surface to form the surface shape of the male die and hold the exposed portion of the square bar elastically against the inner surface of the female die when closing the die. Another object of the present invention is to provide a mold for molding a composite foamed synthetic resin molded product, which is elastically urged in the mold direction to stand upright.

[Operation] However, in order to mold a composite foamed synthetic resin molded product using the above-mentioned molding die, first, a material having good cross-sectional shape and length and good nailability and / or adhesiveness is prepared. After forming a square bar, and after arranging this square bar by manual work or automatic work using a working robot in a portion corresponding to the pressing means provided at a predetermined position of the male mold in the female mold with the mold opened, The male die is relatively moved toward the female die to bring them closer to a cracking state where there is a gap of 3 to 4 mm between them, and in this state, pre-foaming as raw material particles from the raw material filling feeder. Composite foam synthetic resin molding in which synthetic resin beads are filled in the molding space, then the mold is completely closed, heated and cooled to embed the square bar in the substrate with at least one surface in the length direction exposed. Molded goods To do.

In the process in which the male mold is relatively close to the female mold and the mold is closed, the pressing member elastically presses the square bar disposed in the female mold toward the inner surface of the female mold to expose the entire surface of the square bar. To contact the inner surface of the female mold.

〔Example〕

Regarding the molding method of the composite foam synthetic resin molded article of the present invention,
It will be described in more detail based on the molding die.

First, FIG. 1 shows, as an example of a composite foamed synthetic resin molded product to be molded, a heat insulating plate provided with a phase-deciding structure over adjacent end faces used as a floor base material for a western space.

In the figure, reference numeral 1 denotes a foam synthetic resin substrate, and a foam polystyrene resin is suitable as a material, but in addition, it is copolymerized with styrene, styrene foam resin by other polymerization means, olefin thermoplastic such as polyethylene and polypropylene. Foam resin or the like can also be used.

Further, 2 is a square bar which is formed of a material having a good nailing property and / or an adhesive property, and is embedded in the substrate 1 with at least one surface in the longitudinal direction thereof being exposed.

This square member 2 is preferably made of a low-expanded polystyrene resin that is about twice as large as the square member 2, but other low-expanded synthetic resin bodies, wood, etc. are used.

The square bar 2 is not limited to the rectangular cross section as shown in FIGS. 1 and 2 (a), but also the I-shaped cross section as shown in FIG. 2 (b) and (c). It is a concept that includes such an inverted T-shaped cross section as well as a round bar body having a flat surface formed over the entire length thereof as shown in (D). The surface is used as the surface 2'exposed from the substrate 1.

Next, FIG. 3 shows a vertical sectional view of a molding die embodying the molding method of the present invention.

The molding die 3 includes a female die 4 and a male die 5, and the male die 5 can be moved laterally with respect to the female die 4, so that the pair of die 3 can be opened and closed. The mold can be closed.

When the mold 3 is closed, the base 1 and the square bar 2 as shown in FIG. 1 are provided between the inner surface of the female mold 4 and the surface of the male mold 5.
The inner surface shape of the female mold 4 and the surface shape of the male mold 5 are formed so that the molding space 7 of the composite foamed synthetic resin molded product 6 is formed.

Reference numeral 8 in the figure elastically presses one side surface of the square bar 2 from the direction of the male die 5 as the die 3 is closed, and the entire exposed surface 2 ′ is brought into contact with the inner surface of the female die 4 and temporarily held. A pressing means is provided on the male die 5 so that at least the entire surface of the square member 2 in the length direction thereof is exposed on the surface of the composite foamed synthetic resin molded product 6 thus formed.

In the illustrated embodiment, the pressing means 8 is the heating chamber 9 of the male mold 5.
A large-diameter central flange is installed inside a bottomed cylindrical guide cylinder 10 that is mounted inside or through the male mold 5, and the tip penetrates the male mold 5 or the opening of the guide cylinder 10. Of the pressing pin 11 which is positioned from the surface of the male die 5 toward the female die 4 through the base and penetrates the bottom end of the guide tube 10 into the heating chamber 9 of the male die 5. A spring 12 is interposed between the flange portion and the bottom portion of the guide cylinder 10, so that the pressing pin 11 is erected from the surface of the male die 5 toward the female die 4 in an elastically biased manner. There is.

A reference numeral 13 in FIG. 4 is a knock pin inserted in a through hole formed at a protruding end of the pressing pin 11 from the guide cylinder 10 on the heating chamber 9 side in order to prevent the pressing pin 11 from coming off.

A plurality of the pressing pins 11 are arranged in the vertical direction of the male mold 5 corresponding to the positions where the square members 2 of the composite foam synthetic resin molded product 6 are to be embedded, and the entire exposed surface 2'of the square members 2 is the female mold 4. It is arranged in two rows in such a positional relationship that it abuts on the inner surface.
The tip position of the pressing pin 11 is set to have a length relationship in which it abuts on or close to the inner surface of the female mold 4 that is closed in a natural state where no force is applied. It can be said that it is preferable for elastically pressing the inner surface of the female die 4.

Further, the portion of the pressing pin 11 projecting from the surface of the male mold 5 toward the female mold 4 remains as a bottomed hole behind the square bar 2 of the molded composite synthetic foam resin product 6 and therefore has a rod shape. In order to maintain the heat insulation performance, it is desirable that the outer diameter of the mold is small and that of the flat plate is small both in thickness and width. It is desired that the tip has a small diameter as a whole to give a draft.

In addition, as shown in FIGS. 2 (a), (b), and (c), when the square bar 2 is one in which one side surface behind the exposed surface 2'where the pressing pin 11 elastically presses is a flat surface, If the pressing pins 11 are arranged in a zigzag pattern in the vertical direction as shown in FIG. 5, it is effective in uniformly applying an elastic pressing force to the entire square bar 2, and one side surface for elastic pressing is shown in FIG. In the case of a curved surface as shown in (1), the tip end surface of the pressing pin 11 may be formed in a shape that matches this one side surface, and at the same time, may be arranged in the same straight line in the vertical direction.

In the figure, 14 is an air cylinder for holding the square bar 2 in the female mold 4 in an upright state. The air cylinder 14 has a built-in two-way cylinder type or spring that can be moved forward and backward by air pressure. , One-way cylinder type is used, in which the forward movement is performed by the reaction force of the spring and the backward movement is performed by the air pressure that overcomes the reaction force of the spring.
A two-way cylinder type is used when the square 2 is placed in the female die 4 by automatic work using a work robot, and a one-way cylinder type is used by manual work.

In the figure, 15 and 16 are water pipes for supplying cooling water to the heating chamber 17 of the female mold 4 and the heating chamber 9 of the male mold 5, and 18 and 19 are provided in the middle of the water pipes 15 and 16, respectively. It is a solenoid valve, 20 in the figure,
21 is the heating chamber 17 for the female mold 4 and 9 is the heating chamber for the male mold 5.
Pipes for supplying steam to the
This is a solenoid valve installed in the middle of 0 and 21.

Further, 24 is a drain pipe and 25 is a drain valve.

Further, reference numeral 26 in the figure denotes a release pin for taking out the composite foam synthetic resin molded product 6 after molding from the female mold 4 after mold opening.

Then, in order to mold the composite foam synthetic resin molded product 6 as shown in FIG. 1 using such a molding die 3, the following is done.

First of all, as shown in FIG. 6 (a), a square bar 2 is prepared which is curved in an arc shape, and a robot for manual work or working is used in a female mold 4 of a mold 3 in which the square bar 2 is opened. The two upper and lower ends are brought into contact with the inner surface of the female die 4 as shown in the figure by the automatic operation described above, and the central portion is arranged in a state of being separated from the inner surface of the female die 4, and at the same time, the upper end of the square bar 2 is rod of the air cylinder After pressing and holding with, the male die 5 is moved in the direction of the female die 4 and cracking in which a gap of about 3 to 4 mm exists between them as shown in FIG. 6 (b). Bring them closer to the state.

During the process in which the male die 5 approaches the female die 4, the square bar 2 in the female die 4 is elastically pressed by the pressing pin 11 especially at the central portion thereof to correct the warp of the square bar 2 and 1
The entire surface 2'exposed from the inside is brought into contact with the inner surface of the female mold 4.

Then, with this gap provided between the female die 4 and the male die 5, the rod of the air cylinder 14 is retracted from within the female die 4, and a pre-foamed synthetic resin as raw material particles is fed from a raw material filling feeder (not shown). The beads are filled in the molding space 7, the mold is completely closed, and steam is fed from the steam pipes 20 and 21 to the heating chamber 17 of the female mold 4 and the heating chamber 9 of the male mold 5 to heat them. After that, the solenoid valves 18 and 19 are opened and water is supplied from the water pipes 15 and 16 to both heating chambers.
The composite foamed synthetic resin molded product 6 is molded by feeding it to 17, 9 and cooling it.

After that, the mold 3 is opened and the molded product 6 remaining in the female mold 4
Is ejected and taken out by the release pin 26.

It is desirable that the square bar 2 used here has a warp b of about 3 to 5 mm with respect to the total length a of 60 cm.

Regarding the point of using the warped square 2 in the illustrated embodiment, the mold 3 heated by the previous molding is normally cooled only to about 40 to 60 ° C. in view of the thermal efficiency of the molding cycle, and is straight without warping. If such a square bar 2 is used, the square bar 2 may come into contact with the mold 3 slightly higher than room temperature and the contact surface side of the square bar 2 may be thermally expanded and warped. By contacting with the mold 3, the warp is absorbed and corrected by internal stress due to heat, and a molded product of stable quality is obtained. In addition, after molding, the back surface and the side surface of the exposed surface 2'of the square bar are insulated. This is to prevent the molded product 6 itself from being warped by being covered by the foamed synthetic resin substrate 1, which is a material, and the heat generated during the heating causes the temperature inside the surface of the square member 2 to become higher than the surface inside.

However, in the present invention, the pressing means 8 is provided in the male die 5 to elastically press the square bar 2 toward the inner surface of the female die 4, so that not only the warped square bar 2 can be sufficiently dealt with. Needless to say, even if it is warped in two directions, it can be sufficiently used.

In addition, in order to cope with the warp of the square bar 2 during or after molding, the amount of water flowing through the water pipe 15 is reduced only by the surface temperature during cooling of the female die 4, or the opening time of the solenoid valve 18 is controlled. Then, the temperature of the male mold 5 is kept at 40 to 60 ° C. as usual to reduce the temperature difference between the exposed surface 2 ′ of the square member 2 and the inside when the mold 3 is cooled. May be.

If the pressing means 8 as in the illustrated embodiment is provided in the male mold 5, the pressing means 8 can be easily provided even in the existing mold 3, which is extremely useful.

Here, in the illustrated embodiment, the explanation has been made on the assumption that a floor base material is created, but in addition, a wall base material and other composite foam synthetic resin molded products may be molded using this molding die. Of course, you can

Further, a round bar body is used instead of the square bar, and the pressing pin 11
If the tip of the is formed to have a semicircular cross section and such a molding die is used, the reinforcing material 27 is internally provided at a position close to the surface of the foam synthetic resin substrate 28 as shown in FIG. It is also possible to easily make the heat insulating plate 29 that has been reinforced or provided with compressive strength.

〔The invention's effect〕

In the method for molding the composite foamed synthetic resin molded article and the molding die thereof according to the present invention as described above, a metal is used without a drive source to elastically press the square bar toward the inner surface of the female die. Not only can the square bar be easily embedded in the foamed synthetic resin substrate with at least one surface in the lengthwise direction completely exposed without increasing the size of the mold, but there is a variation in the dimensional accuracy of the square bar. Or, even when warpage occurs, a composite foamed synthetic resin molded article in a desired state can be obtained.

[Brief description of drawings]

FIG. 1 shows an example of a composite foamed synthetic resin molded product obtained by the molding method of the present invention, (a) is a plan view, (b) is a front view, and FIG. 2 (a) (b) (c) ( D) is a front view showing an embodiment of a square bar, FIG. 3 is a longitudinal sectional view of a molding die of the present invention, and FIG.
FIG. 5 is a cross-sectional view of the main part, FIG. 5 is an explanatory view showing the disposition state of the pressing pin, FIGS. 6 (a), (b) and (c) are schematic views showing the molding method, and FIG. 7 is the present invention. FIG. 6 is a cross-sectional view of a heat insulating plate created by applying the molding method of FIG. 1: foam synthetic resin substrate, 2: square material, 3: molding die,
4: female mold, 5: male mold, 6: composite foam synthetic resin molded product, 7: molding space, 8: pressing means, 9: heating chamber, 10: guide cylinder, 11: pressing pin, 12: spring, 13: Dowel pin, 14:
Air cylinder, 15: water pipe, 16: water pipe, 17: heating chamber, 1
8: Solenoid valve, 19: Solenoid valve, 20: Steam pipe, 21: Steam pipe, 2
2: Solenoid valve, 23: Solenoid valve, 24: Drain pipe, 25: Drain valve, 26: Release pin, 27: Reinforcement material, 28: Foam synthetic resin substrate, 29: Heat insulating plate.

Claims (3)

[Claims] 1. A molding space for a composite foam synthetic resin molded article comprising a foam synthetic resin substrate and a square between an inner surface of the female mold and a surface of the male mold when the female mold and the male mold are closed. A square bar having good nailability and / or adhesiveness in the substrate in a pair of molds in which the inner surface shape of the female mold and the surface shape of the male mold are formed so that At least one side surface in the length direction of the square bar is arranged so as to be embedded integrally in a state where the one surface is exposed, and at least one side surface of the square bar is closed as the male mold relatively closes to the female mold. It is elastically pressed by the pressing means that is elastically biased from the male mold direction, and the exposed surface of the square bar is temporarily held in contact with the inner surface of the female mold, and the mold is closed and placed in the molding space. Molding of a composite foamed synthetic resin molded product by filling raw material particles and directly molding both Law. 2. A square bar bent in an arc shape is used, and both ends are brought into contact with the inner surface of the female mold, and at the same time, the central portion is arranged in the female mold in a state of being separated from the inner surface of the female mold. When the mold is relatively moved in the direction of the female mold and the mold is closed, the central portion of the square bar is elastically pressed toward the inner surface of the female mold to correct the warp of the square bar and the entire surface of the square bar exposed from the substrate is closed by the female. The method for molding a composite foamed synthetic resin molded article according to claim 1, wherein the molded article is brought into contact with the inner surface of the mold. 3. A nail moldability and / or a mold comprising a female mold and a male mold, at least one surface of which is exposed between the inner surface of the female mold and the surface of the male mold when the mold is closed. The inner surface shape of the female die and the surface shape of the male die are formed so that a molding space of a composite foamed synthetic resin molded product composed of a square member having good adhesiveness and a foamed synthetic resin substrate is formed. When the entire exposed surface is closed, the pressing means is elastically biased from the surface of the male mold toward the female mold so as to temporarily hold the inner surface of the female mold while elastically pressing it. Mold for molding composite foam synthetic resin molded products.