JPH0245967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a synthetic resin molded body and a mold for synthetic resin molding used in this production method, and relates to a method for producing a synthetic resin molded body and a mold for synthetic resin molding used in this production method. Hole debris) is automatically removed as the mold clamp moves.

For molding plastics, especially plastic foams, especially soft polyurethane foams used for car seat cushions, furniture cushions, etc., a mold as shown in FIGS. 1 and 2 is used, for example. . This mold 1 consists of an upper lid 3 and a lower mold 4 that form a molding cavity 2, and a clamp 5 that tightens these upper lid 3 and lower mold 4 during molding.
The foam-forming resin composition is injected into the cavity 2 of the lower mold 4 and foamed to obtain a foam-molded product molded into the shape of the cavity 2.

To specifically show how to manufacture a foam molded product using this mold 1, first, the upper lid 3, the lower mold 4
After applying a mold release agent to the inner surface of each of the molds, foam forming resin is injected into the lower mold 4 before the upper lid 3 is closed, and then the upper lid 3 is closed and the clamp 5 is attached to the lower mold 4.
In order to remove the air inside the mold 1 and the gas generated by the reaction from the cavity 2, a plurality of gases are installed in the upper lid 3. A small hole (vent hole) 6 for venting is formed, and air and gas are released from the mold 1 through the vent hole 6. Then, the mold 1 is introduced into a heating furnace for a predetermined period of time to react, and after the foaming process has been completed, the clamp arm 5a and the clamp roll 5b connected to the clamp 5 are rotated upward to move the clamp 5 to the lower mold 4. , and rotate the upper cover 3 upward about the hinge 7... to close the upper cover 3.
will be released. Then, the foam molded product is taken out from the mold 1 with the upper lid 3 open.

By the way, when obtaining a foam molded product using such a mold 1, air and gas are released from the vent holes 6, and at the same time, a part of the foam molded product pops out outside the mold 1 like a bud. It becomes vent hole waste. If this vent hole waste is not removed after each molding, air and gas will not be able to escape sufficiently during the next molding, resulting in gas retention in the foam molded product, resulting in a defective product. For this reason, in order to prevent vent hole debris from coming out, vent holes 6 should be covered with a thin breathable sheet (for example, paper, etc.).
(urethane foam, etc.), but this method requires a lot of man-hours when the shape of the foam molded product is complex and there are many vent holes 6, and it is difficult to paste inside a narrow cavity. It is difficult to wear. In addition, there are methods to manually remove vent hole debris once generated, to remove it by blowing high-pressure air, or to remove it by poking the vent hole 6 with a thin pin. This method also requires a lot of effort and is inefficient. Furthermore, although there is a method of removing it using a robot, it has the disadvantage of high equipment cost.

This invention was made in view of the above circumstances,
To provide a method for manufacturing a synthetic resin molded body that can efficiently and reliably remove vent hole debris without requiring any human labor, and that requires simple equipment and almost no cost, and a mold for use in this method. This is the purpose.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

Figures 3 to 7 show an example of the mold of the present invention, which is an example of a mold for producing a polyurethane foam molded product. Reference numerals are given and explanations thereof are omitted.

The mold 11 in this example has a vent hole debris removing member 12 attached to its upper part. This vent hole debris removing member (hereinafter referred to as the debris removing member) 12 moves back and forth while rubbing the base 13 attached to the clamp 5 and the vicinity of the opening of the vent hole 6 in the upper lid 3 of the mold 11. A large number of blades 14..., bases 13... and blades 14... are connected, and L-shaped angles 15..., which transmit the movement of the clamp 5 to the blades 14..., oblique arms 16..., moving arms 17..., and sub-arms 18... It is composed of.

As shown in FIG. 5, the base 13 is made by cutting groove-shaped steel with a substantially U-shaped cross section to an appropriate length, and one side plate portion 13a has a groove for fixing the base 13 to the clamp 5. A butterfly screw 13b is screwed onto the top plate portion 13c, and an L-shaped angle 1 is attached to the top plate portion 13c.
The vertical sides 15a of No. 5 are welded and fixed together. As shown in FIG.
It can be removably attached.

The L-shaped angle 15 is made by welding two flat bars at right angles, one side of which is the vertical side 1.
5a is fixed to the base 13, the other side is a horizontal side portion 15b, and a diagonal arm 16 is rotatably attached to the tip of the horizontal side portion 15b by a rotation pin 19.

The diagonal arm 16 is made by cutting a flat bar to an appropriate length, and the movable arm 17 is connected to the end opposite to the end connected to the L-shaped angle 15 by a pivot pin 20. is rotatably attached.

The moving arm 17 has a connecting plate part 17b made of a flat bar connected to the diagonal arm 16 connected to one end of an arm part 17a made of a relatively long bar, as shown in FIG. Therefore, the movable arm 17 is capable of horizontal movement parallel to the horizontal side 15b of the L-shaped angle 15. Also, moving arm 1
Sub-arms 18 are removably attached to the arm portion 17a of No. 7 by means of connecting jigs 21, which are perpendicular to the arm portion 17a in a horizontal plane.

The sub-arm 18 is made by cutting a round bar material to an appropriate length, and the connecting jig 21 is made by making the bars orthogonal to each other and removably using screws, as shown in FIGS. 5 and 6. For example, a so-called Mutufu, which is used when assembling chemical experiment equipment, is used. As shown in FIG. 6, blades 14 are detachably attached to the sub-arm 18 using connecting jigs 21.

As shown in FIGS. 6 and 7, the blade 14 consists of a blade portion 14a made of a rectangular plate material, and a support rod portion 14b made of a round bar joined to one end surface of the blade portion 14a. The tip of this support rod portion 14b is attached perpendicularly to the sub-arm 18 by the connection jig 21. A required number of blades 14 are provided corresponding to each vent hole 6 of the upper lid 3.

Therefore, the debris removing member 1 configured in this way
2, by attaching its base 13 to the upper side of the clamp 5, the blade portion 1 of each blade 14 is moved by its own weight as shown in FIGS. 3 and 4.
The end face of the mold 11 is in contact with the outer surface of the upper lid 3, and can be freely slid and moved on the outer surface of the upper lid 3.

In addition, the inverted J-shaped member erected approximately at the center of the upper lid 3 shown in FIGS.
When rotating upward to open the diagonal arm 1,
6. Move the moving arm 1 so that the moving arm 17, sub-arm 18 and blade 14 do not hang down.
7 is a support member 22 for hanging and locking.

Next, the debris removing member 12 configured in this way
We will explain how to remove venthole debris using the following.

First, as shown in FIGS. 3 and 4, the debris removing member 12 is inserted into the vent hole 6.
each blade 14 so as to be located on the clamp side of the
The sub arm 18 is positioned and set.
Then, a foam molded product is formed by a conventional method.
At this time, vent hole debris is generated from the vent holes 6 as usual. Next, the step of taking out the foam molded product from the mold 11 is to release the clamp 5 of the mold 11 from the locking protrusion 4a of the lower die 4 as usual and rotate it diagonally upward in the direction of the arrow in the figure to release it. Then, as the clamp 5 moves, the L-shaped angle 15 of the waste removal member 12 moves diagonally downward, and accordingly, the diagonal arm 16 also moves diagonally downward, and the moving arm 17 moves approximately parallel to the upper lid 3. Then, the mold 11 is moved horizontally to the hinge 7 side of the mold 11. As the movable arm 17 moves horizontally, each blade 14 moves from the clamp 5 side of the opening of the vent hole 6 to the hinge 7 side while rubbing the outer surface of the upper lid 3. At this time, vent hole debris existing at the openings of the vent holes 6 is cut out and removed by the blades 14. That is, the debris removing member 12 moves the blades 14 horizontally in accordance with the release operation of the clamp 5 to take out the molded product, and removes vent hole debris.

Next, the upper lid 3 with the clamp 5 released is opened upward, and the foam molded product is taken out, and the scraps removed from the vent hole slide off the upper lid 3 and are placed in a trash box provided on the side of the mold 11. (not shown) etc.

As described above, in the case of the mold 11 provided with this waste removal member 12, the conventional rotational movement for releasing the clamp 5 of the mold 11 is used to remove vent waste. Since it is an electric motor, it does not require any special power, has a simple structure, and requires only a small amount of equipment cost. In addition, the moving arm 17, the sub arm 18 and the sub arm 1
8 and the blade 14 are made detachable using a connecting jig 21, so even if the mold 11 is changed and the position or number of vent holes 6 is changed, this can be quickly and easily accommodated. Therefore, the position and number of blades 14 can be changed, making it extremely versatile.

In the above example, the movable arm 17 and the sub-arm 18 and the sub-arm 18 and the blade 14 are connected using the connecting jig 21, but if the position and number of vent holes 6 are constant, welding, etc. It may be fixed by Alternatively, as shown in FIG. 8, a J-shaped moving arm 17 can be rotatably connected directly to the vertical side 15a of the L-shaped angle 15 using a pivot pin 19.
Furthermore, instead of the L-shaped angle 15 and the diagonal arm 16, a sickle-shaped member may be connected to the base 13 and the moving arm 17. Any movement that can be conveyed as a horizontal movement is acceptable. Furthermore, the present invention can be applied to the molding of foamed plastics and plastics other than polyurethane foam by changing the shape of the blade portion 14a of the blade 14, the load applied to the blade portion 14a, etc.

As explained above, the manufacturing method and mold of the present invention include an upper lid, a lower mold, and a clamp, and the upper lid is provided with a vent hole. The clamp is equipped with a vent hole debris removal member that moves back and forth while rubbing the clamp, and the vent hole debris is removed as the clamp is released, reliably and automatically without the need for special power. Vent hole debris can be removed. In addition, the structure is simple and the equipment cost is small.
Moreover, it has the advantage of being versatile for various molds.

[Brief explanation of the drawing]

1 and 2 show conventional molds, FIG. 1 is a plan view, FIG. 2 is a sectional view, and FIGS. 3 to 7 show examples of the mold of the present invention. 3 is a plan view, FIG. 4 is a cross-sectional view, FIG. 5 is a side view showing a part of the debris removal member, FIG. 6 is a front view showing the blade installed, and FIG. 7 is a side view of the blade. FIG. 8 is a side view showing a modification of the debris removing member. DESCRIPTION OF SYMBOLS 11...Mold, 12...Vent hole waste removal member, 13...Base, 14...Blade, 1
5...L-shaped angle, 16...Diagonal arm, 17
...Moving arm, 18...Sub arm, 19,2
0...Rotating pin.

Claims (1)

[Scope of Claims] 1. A method for producing a synthetic resin molded body molded into the shape of a cavity by supplying a synthetic resin molding resin composition to a synthetic resin molding mold, wherein the mold is provided with a movement of a clamp of the mold. A synthetic resin molded body, characterized in that a vent hole debris removing member is provided which moves back and forth while rubbing around the opening of the vent hole in conjunction with the opening of the vent hole, and the vent hole debris is removed as the clamp is released. Production method. 2. The manufacturing method according to claim 1, wherein the synthetic resin is a synthetic resin foam. 3 It has an upper lid, a lower mold, and a clamp that tightens these upper lid and lower mold, and the upper lid is provided with a vent hole, and the clamp has a vent hole on the outside of the upper lid that extends around the opening of the vent hole in conjunction with the movement of the clamp. A mold for synthetic resin molding that is provided with a vent hole debris removal member that moves back and forth while rubbing.