JP3099005B1 - Molding equipment for foam molding - Google Patents

Abstract

An object of the present invention is to form a high-low step shape with high precision by eliminating uneven filling at a step portion at a front end portion of a foam molded article. SOLUTION: The outer periphery of the concave inside 12a is fixed to a fixed frame metal 12b, and the outer periphery of the convex inside 13a is fixed to the fixed frame metal 13b via an intermediate mold 3.
A cavity 11 is formed therebetween. The intermediate mold 3 is provided with a step on the side of the filling body so as to form a step between the low step 11b and the high step 11a.
a and a part line that forms a first ventilation opening 21 communicating with an independent passage 22 communicating to the outside, and a stepped portion of the intermediate mold 3 is provided between the intermediate mold 3 and the intermediate mold 3. In the portion facing the upper surface portion of the high step portion 11a,
A second ventilation opening 31a communicating with the independent passage 22 is provided separately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mold apparatus used in a foam molding method for obtaining a foam molded article from beads of a foamable resin material such as polystyrene. In particular, the present invention relates to a foam molding die apparatus for molding a container-shaped molded article with a lid that is excellent in molding accuracy and can improve the tightness of a lid and a container.

[0002]

2. Description of the Related Art Here, an outline of a foam molding method as a background of the present invention will be explained. As shown in a schematic sectional view of FIG.
3 and the concave mold 12 are arranged to face each other.
a, 13a are cavities 1 in which the foamed molded body is filled and molded
1 are formed. And inside 12a, 1
A large number of core vents 12y and 13y are provided in 3a so that utilities such as heating steam and reduced pressure exhaust can be passed through. Further, the convex mold 13 and the concave mold 12 move the convex mold 13 in the lateral direction from the state shown in FIG.
The mold can be opened so that the foamed molded product filled and molded into 1 can be taken out.

A concave chamber 12x and a convex chamber 13x, to which utilities such as steam and compressed air are supplied from outside, are formed inside the concave and convex molds 12, 13, and are formed substantially at the center of the inside 12a. The filling device 3 for filling the raw material beads into the cavity 11 is disposed so as to pass through the concave side chamber 12x. The upper portions of the concave and convex molds 12 and 13 are provided with utility ports 14 and 15 for supplying utilities such as steam, and the lower portions are provided with utility ports 1 and 2.
Reference numerals 7 and 17 are provided to serve utilities such as exhaust, intake, and drain.

[0004] Using such a mold apparatus for foam molding,
In order to manufacture a foamed molded article, first, raw material beads obtained by prefoaming a predetermined foamable resin from a raw material tank (not shown) are fed into the cavity 11 through the filling device 3 and filled therein, and then the concave chamber is formed. Heating steam is supplied to the 12x and the convex side chamber 13x to be heated and foam-fused, then cooled and solidified, and taken out as a foam molded body.

Conventionally, as a method for filling the expandable raw material beads, 1) the convex 13 is slightly moved, and a joint between the convex 13 and the concave 12 is opened, so-called cracking is provided. In a state where the interior of the cavity 11 is communicated from the part line 16 to the atmospheric pressure via the inter-mold space and is opened, cracking for mechanically transporting and filling the raw material beads into the cavity 11 by filling air supplied to the filling device 3. There is a law.

Next, 2) the inside of the container of the raw material tank is
Taking the case of expandable polystyrene resin as an example, 0.2 to
The pressure difference is utilized in the cavity 11 which is pressurized to about 1.5 kg / cm ² , closed the mold, and opened to the atmospheric pressure from the core vents 12y and 13y through the concave chamber 12x and the convex chamber 13x. There is a pressure filling method in which the raw material beads of the expandable resin are transported and filled.

[0007] Further, 3) taking the pressure of the raw material tank as an example in the case of foamed polypropylene resin, pressurizing to about 1.0 to 5.0 kg / cm ² which is higher than the pressure filling method,
In addition, there is known a compression filling method in which the pressure in the chambers 12x and 13x is adjusted to a slightly lower pressure than that, and the raw material beads are conveyed in a compressed state by the differential pressure and filled in the cavity 11. In this case, since the cracking is not provided, the part line itself is maintained in a closed state and filling is performed. These filling methods essentially provide an appropriate differential pressure between the raw material tank and the cavity 11 and feed the raw material beads based on the differential pressure.

In recent years, the need for a highly airtight lidded container made of a foam molded article has increased, and in response to this, the lid and the container body have been formed into an uneven fitting shape as shown in FIG. Was. However, in this way, two steps of a high step portion 11a and a low step portion 11b are provided at the outer end of the outer periphery on the container side, and the high step portion 11a is fitted into the concave groove 11d on the lid side to improve airtightness. In order to maintain a high level, it was necessary to form the shapes of both tip portions with high precision.

In order to form such a step at the front end, as shown in FIG. 12, a large number of core vents 13z are provided at a portion corresponding to the outer front end of the inside 13a, and the cracking method is used. Was compatible. As shown in FIG. 14, which is an enlarged cross-sectional view showing a main part of FIG. 12, when the raw material beads are filled, the filling air in the low step portion 11b is exhausted from the opened part line 16 and the filling air in the high step portion 11a. Was intended to exhaust the gas from many vent holes of the core vent 13z to the chamber 13x so that the tip portion of the filling body can be molded with high precision.

However, if the plurality of core vents are arranged closely, the strength of the mold is reduced.
Because the core vent cannot be arranged at the following intervals, and the core vent is not released to the atmosphere, the filling air in the high step portion 11a of the packing cannot be uniformly exhausted, and the corner 11c There is a problem that the filling of the resin is insufficient, and the molding accuracy is reduced. Further, among the filling methods, the pressure filling method and the compression filling method do not exhaust air from the open part line 16 as shown in FIG. 14, so that the corners along the part line of the low step portion 11b are filled. Was also insufficient.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been developed for use in a foaming method used for a container with a lid in a cracking method, a pressure filling method, a compression filling method, or the like. Provided is a mold apparatus having a structure capable of eliminating unevenness in filling of a stepped portion at an outer peripheral end portion of a molded body and accurately forming a stepped shape with high and low levels.

[0012]

SUMMARY OF THE INVENTION The above-mentioned problem is obtained by filling raw material beads into a cavity formed between the convex and concave insides, and forming a high step portion along the outer peripheral tip.
And a mold device for forming a filling body to be a container or a lid having a step of a low step portion , wherein a mold portion for molding one step portion of a tip portion of the filling material is provided. Arranging a part line having a gap so as to form a first ventilation opening, and connecting the first ventilation opening to an independent passage formed between the convex shape and the concave shape and leading to the outside, The present invention is characterized in that a second ventilation opening is provided separately from the first ventilation opening at a portion where the other step is formed, and the second ventilation opening is also communicated with the independent passage. Can be solved by the foam molding die apparatus.

According to the foam molding die apparatus of the present invention, one of the outer peripheral end portions of the filling material serving as a container or a lid is provided .
The mold side for molding the stepped portion includes a first vent opening formed by the part line with a gap, the portion for molding the other stepped portion <br/> of the tip portion, and the first ventilation opening Is a separate second
Since a ventilation opening is provided and both of them can be exhausted by the same independent passage, even in a portion where uneven filling is likely to occur, the insufficient filling can be compensated for, and the packing density of the high and low step portions can be averaged. Becomes possible.

In the case where the molded body has such a complicated shape as to provide a step, the mold becomes complicated, so that it is inevitable that the geometric capacity is increased.
Since the heat capacity of that part also increases, there has been a problem that a delay in the rise or fall of the temperature occurs during the molding operation for heating or cooling, resulting in a quality difference with other parts. In addition, if the operation time is extended to eliminate this delay, other parts may be overheated or supercooled, or the cycle time may be extended or energy may be lost. However, such a problem causes the independent passage in the foam molding die apparatus of the present invention to be used for supplying compressed air, steam, cooling water, or the like, discharging them, or exhausting under reduced pressure. The problem can be solved by applying to the provided passage. In other words, the heat supply to the portion where the heat capacity is relatively large can be supplied while controlling the heating speed and the cooling speed independently under conditions different from those of the other portions, such as the heating speed and the cooling speed. It can be eliminated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a foam molding die apparatus according to the present invention will be described with reference to FIGS. First, in FIG. 1 showing the first embodiment, the outer peripheral portion of the concave inside 12a is
2b, it is fixed to a concave frame (not shown), and at the same time, the outer periphery of the convex inside 13a is fixed to the convex side fixing frame metal 13b via the intermediate mold 3, and this fixing frame metal 13b is A cavity 11 which is fixed to a convex frame (not shown) and which can be filled with raw material beads is formed between the insides 12a and 13a.

In this case, the intermediate mold 3 is provided with a step on the surface exposed to the cavity 11, and is set so as to form a step between the low step 11b and the high step 11a on the side of the filler. The feature of the first embodiment is that the inside 12 a and the low step portion 1 of the intermediate mold 3 are formed.
A part line having a gap is formed so as to form a first ventilation opening 21 between the first ventilation opening 1b and the first ventilation opening 21. Passage 22
A second ventilation opening 31 a is provided separately from the first ventilation opening 21 at a portion of the intermediate mold 3 facing the upper surface of the high step portion 11 a of the step. The second ventilation opening 31a also communicates with the independent passage 22 through the intermediate passage 31b.

[0017] Here, the second ventilation opening 31a is provided, at its portion facing the entire circumference of the upper surface of the high-stage portion 11a, and a portion is brought close to the corners, width 0.3 arranged in two rows ~ 0.6m
m, and the inner end thereof is formed in the intermediate passage 31.
The hole is drilled to reach depth b. The intermediate passage 31b, which is drawn by a parallel thin line, is formed by forming a circular hole having a diameter of about 3 to 6 mm or an oval end mill elongated hole from the independent passage 22 side, and a slit hole communicating with the second ventilation opening 31a. It is set up to contact you. According to such a structure, the filling air in the high step portion 11a of the filling body is smoothly exhausted from the second ventilation opening 31a to the independent passage 22 through the intermediate passage 31b, which has conventionally occurred. Uneven filling can be effectively prevented. Further, the mold apparatus of the present invention can perform filling by employing pressure conditions such as a cracking method, a pressure filling method, and a compression filling method in a state in which the mold is completely closed.

In FIG. 1, a third ventilation opening 31c is provided in the intermediate mold 3 on the mold surface facing the upper surface of the low step portion 11b, and the independent passage 2 is formed through the intermediate passage 31d.
2 and is configured to compensate for the insufficient filling of the raw material beads in the low step portion 11b. As a modification of this embodiment, as shown in FIG. 2, if an auxiliary mold 32 is additionally fixed to the lower part of the intermediate mold 3, the positions of the second ventilation opening 31a and the third ventilation opening 31c can be changed. Newly,
Since the second ventilation opening 32a and the third ventilation opening 32c are changed, the size of the filling material is reduced by the size of the auxiliary mold 3.
It can be adjusted to be smaller by the height of 2. Therefore,
When the size of a product is changed, it is possible to respond quickly and easily.

A second embodiment will be described with reference to FIG.
In FIG. 3, the outer peripheral portion of the concave inside 12a is fixed to a concave frame (not shown) via the concave side fixing frame hardware 12b, and at the same time, the outer peripheral portion of the convex inside 13a is fixed to the convex internal fixing frame hardware 13b. Are fixed to a convex frame (not shown) through the inside 12a, 1
A cavity 11 into which the raw material beads can be filled is formed between 3a. A feature of the second embodiment is that an intermediate mold 4 provided with a step at the tip of the inside 13a to form a step between the low step 11b and the high step 11a on the side of the filling body. site but is arranged, the intermediate mold 4, a porous member 41 constituting the part facing the upper surface portion of the high-stage portion 11a of at least the step, facing the upper surface portion of the low stage portion 11b of the step And an auxiliary member 42 constituting And inside 1
A part line having a gap is formed between the mold 2a and the auxiliary member 42 of the intermediate mold 4 so as to form the first ventilation opening 21, and the first ventilation opening 21 is formed between the concave and convex molds. In addition to communicating with the independent passage 22 communicating to the outside, the countless internal communication vents of the porous member 41 form countless second ventilation openings on the cavity 11 side, and communicate with the independent passage 22 through the intermediate passage 42a. It is in communication. The intermediate passage 42a is prepared similarly to the intermediate passage 31b of the first embodiment.

Thus, the internal communicating holes of the porous member 41 can smoothly discharge the filling air in the high step portion 11a of the filling member to the independent passage 22 through the intermediate passage 42a. Similarly, uneven filling can be effectively prevented. In addition, as the porous member 41, a so-called sintered metal body obtained by sintering metal particles is suitable. In this embodiment, the intermediate mold 4 is formed by the porous member 41 and the auxiliary member 42. Although it is formed, it may be constituted entirely by a porous member.

A third embodiment will be described with reference to FIG. In this embodiment, a part line having a gap is formed at the foremost portion of the insides 12a and 13a so as to form the first ventilation opening 21, and the first ventilation opening 21 is formed.
Is formed between the concavo-convex mold and an independent passage 22 communicating with the outside.
The core vent 5 is formed so that a high step portion 11a and a low step portion 11b of the filling body can be formed at the tip portion.
It is characterized in that an intermediate mold 5 having steps 1 and 52 provided with a step is arranged. Each of the core vents 51 and 52 serves the function of the second ventilation opening similarly to the other embodiments to promote the exhaust of each stepped portion. Since the gas can be exhausted from 21, sufficient effects can be expected.

A fourth embodiment will be described with reference to FIG. In this embodiment, an intermediate mold 6 is arranged at a position similar to the first and second embodiments, and includes a cavity 11.
A step is provided on the surface exposed to
b and the high step portion 11a are set to form a stepped shape. Then, to form the vent openings 21 in the first between the intermediate mold 6 which forms the inside 12a and low-stage portion 11b
Such a gap part lines are disposed, together with communicates with the independent passages 22 communicating with the outside is formed between the uneven form, of the intermediate mold 6, the portion facing the upper surface portion of the high-stage portion 11a, Core vent 6 forming second ventilation opening
1 are provided at a pitch of, for example, about 20 mm, communicate with the independent passage 22 through a slit-shaped intermediate passage 62, and further, a series of drill holes facing the upper surface corner of the high step portion 11 a, For example, it is characterized in that it is provided at a pitch of 10 mm. In this embodiment, in addition to the second ventilation opening,
Since the drill holes are provided facing the upper corners of the high step portion 11a, uneven filling can be effectively prevented.

A fifth embodiment will be described with reference to FIGS. In this embodiment, an intermediate mold 7 is arranged at a position similar to that of the first and second embodiments.
A step is provided on the surface exposed to 1 and is set so as to form a step between a low step and a high step on the side of the filler. A part line having a gap is formed between the inside 12a and the intermediate mold 7 on the lower step side so as to first form the ventilation opening 21. The part line is formed between the concavo-convex molds and communicates with the outside. It communicates with the passage 22. Further, slit-shaped intermediate passages 72, 73 forming second ventilation openings 71a, 71b are provided at both corners of the intermediate mold 7 facing the upper surface of the high step portion of the filling body. And is communicated with the independent passage 22.

FIG. 7 is a perspective view showing a part of the intermediate mold 7, in which metal blocks 74 and 75 are stacked and integrated. The metal block 75 has a plurality of slit forming grooves 72a, 73a is bored, and when fixed to the inside 13a, the slit-shaped intermediate passage 7
2, 73 are formed. In this embodiment, the second ventilation openings 71a and 71b are formed at both corners facing the upper surface of the high step portion of the filling body, which is the portion where the filling air hardly escapes during the filling operation. It is extremely effective in preventing uneven filling.

A sixth embodiment will be described with reference to FIGS. In this embodiment, the intermediate mold 8 for molding the lid portion of the lidded container and corresponding to the high step portions 11c and 11e and the concave groove portion 11d of the filler formed at the tip portion of the cavity 11 is used. It is a mold device provided. The basic structure is the same as that of the fifth embodiment described above, and a step of the intermediate mold 8 is provided on the surface exposed to the cavity 11, and the step is set so as to form the step on the side of the filling body. A part line having a gap is formed between the inside 12a and the intermediate mold 8 so as to form a first ventilation opening 21. The part line communicates with an independent passage 22 formed between the concave and convex molds and communicating with the outside. ing. And, of the intermediate mold 8,
The second ventilation openings 81a, 81b are provided at the corners facing the respective upper surface portions of the high step portions 11c, 11e of the filling body.
The slit-shaped intermediate passages 82 and 83 that form the slits are provided and communicate with the independent passages 22.

FIG. 9 is a perspective view showing a portion of the intermediate mold 8 taken out, in which metal blocks 84 and 85 are stacked and integrated. The metal block 84 has a plurality of slit forming grooves 82a. The metal block 85 is provided with a plurality of slit forming grooves 83a, and when fixed to the inside 13a, a slit-shaped intermediate passage 82,
It is prepared to form 83. In this embodiment,
A mold apparatus for foam molding a lid with a recessed groove portion 11d, which may be high stage portion 11a engaged wear already mentioned container side, the second vent openings 81a, 81b is filled air during filling Is effectively exhausted, so that uneven filling of the filling body can be prevented, and a highly airtight lid can be manufactured.

In the present invention, as described above, a predetermined second ventilation opening is provided. Specifically, a drill hole, a core vent, a slit hole, and a porous hole are provided in accordance with the shape characteristics of an applicable portion. One or two of a number of communication holes in the material
Combinations of more than one species can be employed as appropriate. Further, in the above description, the structure of the tip portion of the filling body was mainly described as an example of a step structure having two steps of height, but the application target of the present invention is not limited to the structure of the embodiment, The mold apparatus of the present invention can be applied to any shape that causes a difference in the exhaust condition when filling the raw material beads and causes uneven filling. Note that the first and second embodiments in each of the above embodiments are described.
Since the vent opening for exhausting the filling air at the time of filling the raw material beads is set to a diameter or opening smaller than the size of the raw material beads to be supplied, usually, for example, 0.2 to 0 0.7 mm.

Next, another embodiment of the present invention will be described with reference to FIGS. In the embodiment described above, the independent passage 22 communicating from the cavity 11 to the outside is provided.
Is described as a passage for exhausting the filling air, but in this new embodiment, as illustrated in FIG. 10, the independent passage 22 is not only connected to the exhaust system, but also used for heating the foam fusion process. Exhaust system connected to the supply and discharge system of steam, cooling water for cooling after foaming processing, pressurized air during release processing, and vacuum depressurization for deaeration and cooling processing in the mold It is characterized in that it also has a function as a passage provided to one or more of the various utilities that can be used in the foam molding process, for example, by being connected to the same. Here, in order to connect the independent passage 22 to an external system, as shown in FIG.
In addition to a structure that communicates with the outside by a communication passage 22a that penetrates the structure, a structure that uses a new utility port 22b that is provided in the frame of the mold 12 and communicates the outside with the independent passage 22 as illustrated in FIG. Can also be adopted as appropriate.

As described above, when the independent passage 22 is also used for other purposes than the exhaust, the utility is usually applied to the filling body through the core vent from the convex chamber 13x and the concave chamber 12x. On the other hand, it is as if this independent passage functions as a third chamber. By directly acting on the filler from the new passage in this way, it is possible to eliminate unevenness in the filling and to reduce the raw material bead. The degree of fusion is also homogenized, so that the quality problem of the molded body near the part line can be solved. In addition, since a delay in heating or cooling during the heating or cooling operation near the inside part line can be eliminated, the cycle time can be reduced from, for example, 135 seconds / cycle to 95 seconds / cycle without an independent passage. For example, it can be shortened to one cycle, which is effective in reducing energy loss as well as improving productivity.

[0030]

As described above, the foam molding die apparatus of the present invention is configured as described above, so that uneven filling at the step portion at the front end portion of the foam molded article can be eliminated and the high-low step shape can be accurately formed. It is possible to mold, consisting of a foam molded body,
A container with a lid having excellent airtightness can be produced. Further, the mold device of the present invention, filling the tip portion of the filling body,
Since each foam molding operation such as heating and cooling can be added independently, there is an excellent effect that the quality of the molded body can be improved and the productivity can be improved. Therefore, the present invention has a very large industrial value as a foam molding die apparatus which has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view for explaining a first embodiment of the present invention.

FIG. 2 is an essential part cross-sectional view for explaining a change in the first embodiment;

FIG. 3 is an essential part cross-sectional view for explaining a second embodiment.

FIG. 4 is an essential part cross-sectional view for explaining a third embodiment.

FIG. 5 is a sectional view of a main part for describing a fourth embodiment.

FIG. 6 is an essential part cross-sectional view for explaining a fifth embodiment;

FIG. 7 is a partial perspective view of a fifth embodiment.

FIG. 8 is an essential part cross-sectional view for explaining a sixth embodiment.

FIG. 9 is a partial perspective view of the sixth embodiment.

FIG. 10 is a sectional view of a main part for describing another embodiment of the present invention.

FIG. 11 Same as above.

FIG. 12 is a sectional view showing an outline of a conventional mold apparatus.

FIG. 13 is a sectional view showing an example of a container with a lid.

FIG. 14 is a sectional view showing a part of a conventional mold apparatus.

[Explanation of symbols]

11 cavity, 11a high step, 11b low step,
12 concave, 12x concave chamber, 12a concave inside, 12b fixed frame hardware, 13 convex, 13x convex chamber, 13a convex inside, 13b fixed frame hardware, 21 first ventilation opening, 22 independent passage, 22a
Communication passage, 22b service opening, 3 middle mold, 31a second ventilation opening, 31b middle passage, 31c third ventilation opening, 32 auxiliary mold, 32a second ventilation opening, 32
c Third vent opening.

Continuing from the front page (72) Inventor Yasuhiro Hirano 564, Mukoyama, Oji, Ageo City, Saitama Prefecture Inside of Daisen Industries Kanto Factory (56) References JP-A-10-643 (JP, A) JP-A-10- 44177 (JP, A) Fully open Showa 51-51465 (JP, U) Fully open view 60-6026 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 44/00-44 / 60 B29C 67/20 B29C 33/00-33/76

Claims (4)

(57) [Claims] 1. A cavity formed between a convex inside and a concave inside is obtained by filling a raw material bead , and an outer periphery is obtained.
Containers with a step between a high step and a low step along the tip
Or a mold device for molding a filling body serving as a lid , wherein there is a gap for forming a first ventilation opening on a mold side for molding one step of a tip portion of the filling body. A part line is arranged, and the first ventilation opening is communicated with an independent passage formed between the convex shape and the concave shape and communicating with the outside, and a portion forming the other step portion of the tip portion includes:
A foam molding die apparatus, wherein a second ventilation opening is provided at least separately from the first ventilation opening, and the second ventilation opening is also communicated with the independent passage. 2. The foam molding die according to claim 1, wherein the second ventilation opening comprises one or more of a drill hole, a vent hole, a slit hole, and a plurality of communication holes of a porous member. apparatus. 3. The foam molding die apparatus according to claim 1, wherein the second ventilation opening is provided at a portion of the step of the filling body where a high step portion is formed. 4. The method according to claim 1, wherein the independent passage comprises pressurized air, steam,
The foam molding die device according to claim 1, wherein the passage is a passage provided for various uses including supply of cooling water or the like, discharge thereof, or exhaustion under reduced pressure.