JPH06155493A - Centrifugal molding apparaus for polymer - Google Patents

Abstract

PURPOSE:To enable molding of a rotationally symmetric article to which centrifugal molding is very hard to apply heretofore and to make contribution to improvement of quality, by a construction wherein a compressed inflow space part having a wedge- shaped section is provided between an upper wall and an injected polymer material support plate and air vent holes are provided in a core body for a molded article and the bottom wall of a casing. CONSTITUTION:In a centrifugal molding apparatus for a polymer, a compressed inflow space part 8 for a polymer material which has a wedge-shaped section tapering gradually around a polymer material injection port 5 is formed between a casing 1 and an injected polymer material support plate 7 and a gap 9 for flowing of a defoamed polymer material is provided between the peripheral edge of the support plate 7 and the peripheral wall 4 of the casing. Under the support plate 7, a space part 11 for molding the polymer which communicates with the gap 9 for flowing is provided between the outer peripheral surface of a core body 10 for a molded article and the inner peripheral surface of the peripheral wall 4 of the casing and first air vent holes 12 are opened in necessary places of the peripheral wall l0a of the core body 10 for the molded article, while second air vent holes 13 are opened in necessary places of the bottom wall 3 of the casing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for centrifugally molding a polymer, and more particularly to an apparatus for molding a liquid polymer raw material by a centrifugal molding method to produce elastic products such as rolls, disks and belts. Is.

[0002]

2. Description of the Related Art Generally, a cast molding method is well known as a method for molding a liquid polymer raw material to produce an elastic product such as a roll, a disc or a belt. For example, in order to manufacture a roll, disc, or the like having a structure in which the surface of the core body is covered with an elastic body, the core body is set in a cylindrical mold to form a casting space portion, and the casting space portion is formed. The liquid polymer raw material is poured into to cure the polymer raw material. By the way, for the above elastic body product, it is a fatal drawback that the elastic body portion contains air bubbles, but it is very difficult to remove the air bubbles by the usual cast molding method as described above. there were.

On the other hand, the centrifugal molding method in which defoaming is performed by utilizing the difference in specific gravity between the liquid polymer raw material and the bubbles is known to be very effective as a means for removing bubbles. For example, Japanese Patent Publication No. 60-15454 discloses a method for producing a thin endless belt by centrifugal molding, and Japanese Patent Laid-Open No. 2-73281 discloses a method in which a body of a roll is centrifugally molded and then formed. A fixing / pressurizing roll used in an electrophotographic copying machine or the like having a cored bar is disclosed.

[0004]

However, the above-mentioned conventional centrifugal molding method has the following problems. In the centrifugal molding method, first of all, the magnitude of the rotating centrifugal force is proportional to the distance from the rotating shaft, so that the separating action by the centrifugal force does not work very much in the portion near the axis. Therefore, air bubbles cannot be completely removed when molding a material having a small inner diameter or a material having a large wall thickness.

Secondly, since the bubbles are collected toward the axial center side by centrifugal separation, it is impossible to integrally form a core body whose surface is coated with an elastic body. For this reason, in the case of producing an elastic roll, it is necessary to centrifuge a cylindrical elastic body (cot) and then fit this to the core body, which is troublesome for the work.

Third, for example, an article having a structure in which the surface of the core body has a complicated shape such as unevenness in order to firmly bond the core body and the elastic body, and the elastic body is formed on the core body is a conventional centrifugal molding. It cannot be molded by the method, and bubbles are extremely likely to accumulate on the uneven surface by the ordinary casting method.

Fourthly, in the centrifugal molding method, the inner peripheral surface which is the interface of the liquid becomes smooth. For example, if the inner surface of the casing peripheral wall has a special shape, the shape of the outer peripheral surface of the molded article can be made to have a special shape corresponding to this, but it is not possible to make the inner peripheral surface of the molded article a special shape. Can not.

Fifth, in order to mold a large number of elastic products such as elastic rolls and belts at one time, it has conventionally been necessary to perform a cutting step of centrifugally molding a cylindrical molded article and then cutting it into a desired size. However, the work is time-consuming and the processing man-hour has increased.

The inventors of the present invention have conducted extensive studies in view of the above points, and as a result, did not remove the bubbles in the liquid polymer raw material only by the centrifugal separation in the casing, but in advance in the compression injection part. It was found that the bubbles can be removed in two steps by injecting only the liquid polymer raw material from which bubbles have been removed using centrifugal force into the casing, and then casting in the casing while also applying centrifugal force. , Completed this invention.

The object of the present invention is to solve the above-mentioned problems of the prior art and to mold various rotationally symmetric articles, which have been very difficult to be centrifugally molded, that is, to mold articles having a small inner diameter or a large wall thickness. Centrifugal molding can be used to integrally mold the core body and the elastic body, and further, the core body and the elastic body having a complicated shape can be integrally molded. A belt with a specially shaped inner peripheral surface can be manufactured by the centrifugal molding method, and bubbles in all products can be effectively removed, contributing to quality improvement and excellent in mass productivity. However, it is an object of the present invention to provide a polymer centrifugal molding apparatus capable of inexpensively supplying elastic products to the market.

[0011]

In order to achieve the above object, the first aspect of the present invention is to provide a liquid polymer raw material injection port in the central portion of the upper wall and to rotate on the lower surface of the central portion of the bottom wall. A bottomed cylindrical casing having a shaft attached thereto and at least one of an upper wall and a bottom wall of the casing being detachable from the peripheral wall, and arranged so as to face the polymer raw material inlet inside the casing upper wall. An injection polymer raw material receiving plate, and a cylindrical core for a molded article arranged in the middle of the receiving plate and the casing bottom wall, and between the inner surface of the casing upper wall and the injection polymer raw material receiving plate, a central portion. A polymer raw material compression inflow space portion having a substantially wedge-shaped cross section is formed, which is gradually tapered from the polymer raw material injection port to the peripheral edge, and the required portion of the peripheral edge of the receiving plate and the casing peripheral wall are formed. Between the corresponding portion of the surface, a flow gap of the liquid polymer raw material degassed by compression is provided, and between the outer peripheral surface of the molded article core and the inner peripheral surface of the casing peripheral wall under the receiving plate. A space for polymer molding which is continuous with the above-mentioned flow gap, a first air vent hole is formed at a required location on the peripheral wall of the molded article core, and a second air vent hole is provided at a required location on the casing bottom wall. The main point is a centrifugal molding machine for polymers.

With the apparatus of the first aspect of the present invention, it is possible to manufacture an elastic roll in which the surface of a cylindrical core body is coated with an elastic body (cot) formed by curing a polymer raw material.

The second invention is an apparatus for producing an elastic roll in which the surface of a ring-shaped core is covered with an elastic body (cot) formed by curing a polymer raw material.

Here, the difference from the case of the first invention is that a ring-shaped molded article core and a ring-shaped spacer having a collar portion are provided between the injected polymer raw material receiving plate and the casing bottom wall. The points are arranged alternately. Then, the ring-shaped spacers are arranged on both upper and lower sides of the core for molded articles, and for distribution of the liquid polymer raw material between a required portion of the flange peripheral edge of each ring-shaped spacer and a corresponding portion of the inner surface of the casing peripheral wall. A space for liquid polymer molding, which is provided with a gap, is surrounded by the outer peripheral surface of each core body for ring-shaped molded articles, the upper and lower spacers, and the inner peripheral surface of the peripheral wall of the casing, and is continuous with the above-mentioned distribution gap, below the receiving plate. Is provided, and a first air vent hole is formed in a required portion of a contact portion between the ring-shaped molded article core and the ring spacer, and a second air vent hole is formed in a required portion of the casing bottom wall. .

Next, a third aspect of the present invention is to manufacture an elastic-coated disk product in which the outer peripheral surface of the horizontal portion of the ring-shaped molded article having a substantially L-shaped cross section is coated with an elastic body formed by curing the polymer raw material. It is a device that does. Such an elastic body coated disc product can be used as, for example, a friction false twist disc for crimping synthetic fiber yarn.

Here, the point different from the case of the first invention is that a ring-shaped molded article core having a substantially L-shaped cross section and a ring-shaped spacer are provided in the middle between the injected polymer raw material receiving plate and the casing bottom wall. Are located alternately.
Then, the ring-shaped spacers are arranged on both upper and lower sides of the molded article core, and a liquid polymer raw material distribution gap is provided between a required portion of each ring-shaped spacer peripheral edge and a corresponding portion of the inner surface of the casing peripheral wall. A liquid polymer molding space surrounded by the outer peripheral surface of the horizontal portion of each ring-shaped molded article, the upper and lower spacers and the inner peripheral surface of the casing peripheral wall, and connected to the above-mentioned distribution gap, below the receiving plate. A first air vent hole is provided at a required position of the contact portion between the ring-shaped molded article core and the ring spacer, and a second air vent hole is provided at a required position of the casing bottom wall.

Finally, the fourth invention is an apparatus for manufacturing an elastic belt used for, for example, a power transmission belt by curing a polymer raw material.

Here, the point different from the case of the first invention is that at least three ring-shaped spacers are arranged in a stack between the injected polymer raw material receiving plate and the casing bottom wall. A tapered surface that tapers downward is provided on the lower surface of the uppermost ring-shaped spacer among the stacked ring-shaped spacers, and a tapered surface that tapers upward is provided on the upper surface of the lowest ring-shaped spacer. The upper and lower surfaces of the intermediate ring-shaped spacer are provided with tapered surfaces that taper upward and downward, respectively, for the purpose of distributing the liquid polymer raw material between the required portion of the peripheral edge of each ring-shaped spacer and the corresponding portion of the inner surface of the casing peripheral wall. A gap is provided, and a space for polymer molding having a substantially V-shaped cross section is provided below the receiving plate, surrounded by vertically adjacent ring-shaped spacers and the inner peripheral surface of the casing peripheral wall and connected to the above-mentioned flow gap. The first air vent hole is formed at a required position of the contact portion of the ring spacers vertically adjacent to each other, and the second air vent hole is provided at a required position of the casing bottom wall. Vent hole is opened.

In the above, examples of the polymer constituting the elastic body of the roll, the disk and the belt include epoxy resin, polyurethane, phenol resin, urea resin, unsaturated polyester resin, silicon resin, methacrylic resin, polyamide resin and the like. Any material that can be applied to cast molding can be used.

The viscosity of the liquid raw material of these polymers is, for example, about 300 to 150,000 cps.

[0021]

In the first aspect of the present invention, the liquid polymer raw material injected from the injection port at the center of the upper wall of the casing which is rotated by the rotation of the rotary shaft is received by the receiving plate facing the injection port, and is then subjected to rotary centrifugation. Due to the action of the force, the inside of the compression inflow space moves in the outer peripheral direction along the receiving plate. The compression inflow space has a substantially wedge-shaped cross-section that gradually tapers from the center of the polymer raw material injection port toward the peripheral edge, so the liquid polymer raw material here has a rotational centrifugal force, As a result of the interaction with the resistance against this, the bubbles are compressed and defoamed. And, since the bubbles having a smaller specific gravity with respect to the liquid polymer raw material are gradually collected toward the inlet in the center of the upper wall of the casing, only the liquid polymer raw material containing no bubbles is introduced into the circulation gap at the periphery of the receiving plate. Flows in and flows into the polymer molding space below the flow gap.

Here, the polymer raw material compression inflow space is
For example, it is desirable to form it radially when viewed from a plane, and each compression inflow space part not only has a narrower vertical width from the polymer raw material injection port to the periphery thereof,
It is preferable to have a substantially wedge-shaped cross section in which the lateral width is also narrowed and gradually tapered. However, the vertical width of the polymer raw material compression inflow space becomes narrower from the injection port toward the peripheral edge, but the left and right width may be left wide. Then, the circulation gap at the peripheral edge of the receiving plate is formed to have an appropriate width according to the left-right width of the tip end portion of each compression inflow space portion.

Actually, a groove for distributing the polymer raw material is provided on the inner surface of the peripheral wall of the casing so as to be continuous with the tip of each polymer raw material compression inflow space having a substantially wedge-shaped cross section. It is preferable to form a distribution gap between them. Since the polymer material compression inflow space that is radial when viewed from the plane and the distribution groove that is connected to the tip of this space are arranged at equal intervals, the injected polymer material flows inside the polymer molding space along the casing peripheral wall from the distribution gap. Flows evenly into.

Further, due to the action of the rotating centrifugal force, the liquid polymer raw material in the injection port is successively fed into the polymer molding space, so that the air having a small specific gravity in the polymer molding space is transferred to the center of the molded article core. It is pushed inward and passes through a large number of first air vent holes formed in the core for molded articles and escapes into the core. Then, the air in the core is discharged to the outside of the casing through the second air vent hole formed in the bottom wall of the casing.

As described above, in the centrifugal molding apparatus according to the present invention, only the liquid polymer raw material from which air bubbles have been removed in the compression inflow space can flow into the polymer molding space. Then, even if a small amount of bubbles remain in the liquid polymer raw material that has flowed into the polymer molding space, the centrifugal action works further in the polymer molding space, so the bubbles in the liquid polymer raw material are completely removed here. Can be removed. Moreover, since the air in the polymer molding space is gradually pushed out in the direction of the core opposite to the direction in which the centrifugal force acts by utilizing the rotational centrifugal force, the air in the molding space during inflow and curing. I will not be involved.

As described above, according to the present invention, the bubbles in the liquid polymer raw material are not removed only by the separation by the centrifugal force in the casing, but the centrifugal force is preliminarily utilized in the injected polymer compression inflow space. After removing the bubbles, only the defoamed polymer raw material is injected into the molding space, and the bubbles and air are removed while the centrifugal force is applied in the molding space as well. Since it has been removed, even when an article having a small inner diameter or an article having a large wall thickness is formed, it is possible to sufficiently remove air bubbles and perform the formation.

Further, since the air in the molding space is removed through the first air vent hole provided in the molded article core, it is possible to integrally mold the core and the elastic body. It does not take time and effort to fit an elastic body once formed into a cylindrical shape or a ring shape into the core body.

Next, in the second aspect of the present invention, a ring-shaped molded article core and a ring-shaped spacer having a flange are alternately arranged between the injected polymer raw material receiving plate and the casing bottom wall. It is a thing. Therefore, also in the device of the second invention, removal of bubbles in the liquid polymer raw material
Defoaming using centrifugal force in the injected polymer compression inflow space, and centrifugal force in the molding space surrounded by the outer peripheral surface of the molded article core body, the upper and lower spacers, and the inner peripheral surface of the casing peripheral wall. By the defoaming that was done, in the same way, 2
Since the air bubbles are removed at the stage, it is possible to sufficiently remove the air bubbles for molding, and the core body and the elastic body are firmly bonded. In addition, since a large number of ring-shaped molded article cores and ring-shaped spacers are alternately stacked, the surface of the ring-shaped core body is coated with an elastic body (cot) formed by curing the polymer raw material to achieve good quality. A large number of cored rolls can be manufactured at one time.

Further, in the third aspect of the invention, a ring-shaped molded article core having a substantially L-shaped cross section and ring-shaped spacers are alternately arranged between the injected polymer raw material receiving plate and the casing bottom wall. It is a thing. Therefore, also in the device of the third invention, the removal of bubbles in the liquid polymer raw material
Defoaming using centrifugal force in the injected polymer compression inflow space, and in the molding space surrounded by the outer peripheral surface of the horizontal part of the ring-shaped molded article core, the upper and lower spacers, and the inner peripheral surface of the casing peripheral wall. In the same way, bubbles are removed in two stages by defoaming using centrifugal force, so it is possible to sufficiently remove bubbles and mold, and the outer peripheral surface of the horizontal part of the core body is complicated such as unevenness. Even if it has a different shape,
Air bubbles can be sufficiently removed, and the core body and the elastic body are firmly bonded. In addition, since a large number of ring-shaped molded article cores having a substantially L-shaped cross section and ring-shaped spacers are alternately stacked, a polymer raw material is provided on the outer peripheral surface of the horizontal portion of the substantially L-shaped ring-shaped molded article core. It is possible to manufacture a large number of elastic-body-coated disk products such as friction false-twisting disks for crimping synthetic fiber yarn with good quality, which are coated with an elastic body formed by curing.

Further, in the fourth aspect of the present invention, an uppermost ring-shaped spacer having a downwardly tapering tapered surface and an upwardly tapering tapered surface are provided between the injected polymer raw material receiving plate and the casing bottom wall. At least three ring-shaped spacers, which are the lowest ring-shaped spacers and intermediate ring-shaped spacers having tapered surfaces that taper upward and downward respectively, are arranged in a stack. Also in the apparatus of the fourth aspect of the invention, the bubbles in the liquid polymer raw material are removed by defoaming by utilizing centrifugal force in the injected polymer compression inflow space, and the ring spacers vertically adjacent to each other and the inner peripheral surface of the casing peripheral wall. By defoaming using the centrifugal force in the molding space surrounded by and, in the same way, so to speak, the bubbles are removed in two steps, so it is possible to remove the bubbles sufficiently and perform molding. By freely setting the shape of the spacers, it is possible to easily manufacture a belt having a special shape on the inner peripheral surface. Further, since a large number of ring-shaped spacers having tapered surfaces are stacked, it is possible to manufacture a large number of high-quality elastic belt products used for, for example, power transmission belts at one time.

According to the apparatus of the present invention, an elastic roll (first and second inventions) in which the entire surface of the cylindrical core is covered with the elastic body, or the surface of the core is partially covered with the elastic body. Rotationally symmetric articles such as discs (third invention), and belts having a special shape on the inner peripheral surface (fourth invention)
Various polymeric elastomeric products can be molded, etc.

As in the second to fourth inventions, a large number of ring-shaped molded article cores and ring-shaped spacers are alternately stacked, or a large number of ring-shaped spacers having tapered surfaces are stacked. As a result, a large number of high-quality molded products can be manufactured at one time, which is suitable for mass production.

[0033]

Embodiments of the present invention will now be described in detail with reference to the drawings.

[Embodiment 1] FIGS. 1 to 3 show a first embodiment of the present invention.
An example is shown to produce an elastic roll (18) in which the surface of a cylindrical metal core (10) is coated with an elastic body (cot) (14) formed of polyurethane rubber.

In the figure, the polymer centrifugal molding apparatus has a liquid polymer raw material injection port (5) at the center of the upper wall (2).
The rotary shaft (6) is attached to the lower surface of the central portion of the bottom wall (3), and both the top wall (2) and the bottom wall (3) are removable from the peripheral wall (4). Bottom cylindrical casing (1), injected polymer raw material receiving plate (7) arranged so as to face the polymer raw material inlet (5) inside the casing upper wall (2), the receiving plate (7) and the casing It consists of a cylindrical core (10) for molded articles, which is arranged in the middle of the bottom wall (3). Above the polymer raw material inlet (5) in the center of the upper wall (2) of the casing (1), the tip of the supply nozzle (16) is visible. The upper wall is attached to the upper end of the casing peripheral wall (4) with a bolt (not shown) to form an upper wall (2), and the bottom plate is attached to the lower end of the casing peripheral wall (4) with a bolt (not shown). As a result, the bottom wall (3) is formed.

Then, between the inner surface of the upper wall (2) of the casing (1) and the injected polymer raw material receiving plate (7), the polymer raw material injection port (5) in the central portion is centered to the peripheral edge. A polymer raw material compression inflow space portion (8) having a substantially wedge-shaped cross section which is gradually tapered is formed. Here, the polymer raw material compression inflow space portion (8) is formed radially as seen from a plane as shown in FIG. 2, and each compression inflow space portion (8) is centered on the polymer raw material injection port (5). As a result, not only the vertical width becomes narrower toward the peripheral edge, but also the horizontal width becomes narrower, and it has a substantially wedge-shaped cross section.

A gap (9) for flowing the liquid polymer raw material degassed by compression is provided between a required portion on the periphery of the receiving plate (7) and a corresponding portion on the inner surface of the casing peripheral wall (4).
The distribution gap (9) is formed to have a width corresponding to the left-right width of the tip of each compression inflow space (8).

In this embodiment, on the inner surface of the peripheral wall (4) of the casing (1), there is formed a concave groove (15) for polymer raw material distribution, which has a substantially wedge-shaped cross section and is continuous with the tip of each polymer raw material compression / inflow space (8). A circulation gap (9) is formed between the peripheral edge of the receiving plate (7) and the inner surface of the casing peripheral wall (4). The bottom of the polymer material distribution groove (15) is inclined so as to gradually open outward as it goes downward. Further, a tapered surface (17) tapering downward is provided on the outer periphery of the lower surface of the injected polymer raw material receiving plate (7),
Further, a core body positioning upper annular convex portion (36) having an outer diameter equal to the inner diameter of the cylindrical molded article core body (10) is provided at the center of the lower surface of the receiving plate (7) so as to project downward. ing. Further, at the center of the upper surface of the casing bottom wall (3), a core positioning lower annular projection (37) having the same outer diameter is provided in an upwardly protruding shape.

Then, between the injected polymer raw material receiving plate (7) and the casing bottom wall (3), a cylindrical molded article core body (10) is provided at both upper and lower ends thereof with annular protrusions for core body positioning. Under the injected polymer raw material receiving plate (7), the outer peripheral surface of the molded article core (10) and the inner peripheral surface of the casing peripheral wall (4) are accommodated in the parts (36) (37). And a polymer molding space (11) continuous with the above-mentioned flow gap (9). In addition, a first air vent hole (12) is formed at a required position on the peripheral wall (10a) of the molded article core (10), and a second air vent hole (13) is opened at a required position on the casing bottom wall (3). Has been.

In the above, while rotating the rotary shaft (6) to rotate the centrifugal molding device of the casing (1), the supply nozzle (16) causes the injection port (5) in the central portion of the casing upper wall (2). A liquid polymer raw material was injected from above.
As the liquid polymer raw material, a polyurethane rubber raw material [viscosity 600 cps, trade name Adiprene (registered trademark) L-100, manufactured by DuPont, USA] was used.

The injected polymer raw material is injected through the injection port (5).
After being received by the receiving plate (7) opposed to, the inside of the compression inflow space (8) is moved to the outer peripheral direction along the receiving plate (7) by the action of the rotational centrifugal force. Compressed inflow space (8)
Has a substantially wedge-shaped cross section that gradually tapers from the center of the polymer material injection port (5) toward the periphery of the polymer material injection port (5). It is compressed and defoamed by the interaction with the resistance force to. Then, the air bubbles having a smaller specific gravity with respect to the liquid polymer raw material are gradually collected toward the inlet (5) in the central portion of the upper wall (2) of the casing (1), so that they are used for circulation around the periphery of the receiving plate (7). Only the liquid polymer raw material containing no bubbles flows into the gap (9), and the flow gap (9)
It evenly flows into the lower polymer molding space (11).

Then, by the action of the rotational centrifugal force, the polymer raw material is successively fed into the polymer molding space (11) from the injection port (5), and the polymer molding space (1).
Since the air in 1) has a low specific gravity, the core for molded articles (1
0) and is passed through a large number of first air vent holes (12) formed in the molded article core body (10).
It escapes to the inside of 0). Further, the air inside the core body (10) is discharged to the outside from the bottom of the casing (1) through the second air vent hole (13) formed in the casing bottom wall (3).

When the molding space (11) is completely filled with the polymer raw material, the inside of the casing (1) is maintained at a predetermined temperature to cure the polymer raw material, and the elastic material is applied to the surface of the cylindrical core (10). Elastic roll coated with (14) (18)
Was manufactured.

As described above, in the centrifugal molding apparatus according to the present invention, only the liquid polymer raw material from which bubbles have been removed in the compression inflow space (8) can flow into the polymer molding space (11), The air in the polymer molding space (11), which has a smaller specific gravity than the liquid polymer raw material, is gradually pushed out by the action of the rotating centrifugal force into the inside of the core body (10) in the direction opposite to the centrifugal direction. When the raw material flows in and is hardened, the molding space (11)
The air inside is not trapped in the polymer.

After molding, the casing bottom wall (3) is removed by loosening bolts (not shown), and the product of the elastic roll (18) shown in FIG. 3 is taken out from the bottom of the casing (1). A shaft (not shown) was fitted into the product of the elastic roll (18) thus obtained and used as an elastic roll for a textile machine. In addition, this elastic roll (18) product is
The polymer does not contain air bubbles, and since the polymer has also entered the inside of the first air vent hole (12) of the core body (10), the core body (10) and the elastic body (14) covering the core body (10) are Are more firmly connected.

A second wall provided on the casing bottom wall (3)
It is desirable that the air vent hole (13) has a shape that allows the air in the polymer molding space (11) to be easily discharged during rotation, and specifically, one or more air vent holes (13) inclined downward and outward. In addition to the above, the casing bottom wall (3) may have a part of a propeller shape to form a required number of air vent holes (13).

[Second Embodiment] FIGS. 4 to 6 show a second embodiment of the present invention.
An example is shown. Here, the difference from the case of the first embodiment is that an elastic body (cot) formed of polyurethane rubber on the surface of the ring-shaped metal core body (20).
The point is that a large number of elastic rolls (28) (see FIG. 6) coated with (29) are manufactured at one time.

First, referring to FIG. 4, the structure of the bottomed cylindrical casing (1) of the polymer centrifugal molding apparatus and the injection polymer raw material receiving plate (7) arranged so as to face the polymer raw material injection port (5) is as follows. The same as in the first embodiment.

Then, in the middle of the injected polymer raw material receiving plate (7) and the casing bottom wall (3), there are four ring-shaped molded article core bodies (20) and a collar portion (25). The three spacers (23) are arranged alternately and concentrically, and the ring-shaped spacers (23) are arranged on both upper and lower sides of the molded article core body (20). Each ring-shaped spacer (23) has a central vertical tubular portion (24),
Of the stacked ring-shaped spacers (23), the uppermost ring-shaped spacer (23a) is composed of the collar part (25) connected to this, and the vertical cylindrical part (24) of this is formed. A flange portion (25) is provided at the upper end portion of the above, and an annular step portion (26) for receiving the core body (20) is provided at the lower half portion of the vertical tubular portion (24). In the lowermost ring-shaped spacer (23b), the vertical cylindrical portion (2
The lower end of 4) is provided with a collar part (25), and the upper half part of the vertical tubular part (24) is also provided with an annular step part (26). In the intermediate ring-shaped spacer (23c),
An annular stepped portion (26) (26) for receiving the core body (20) is provided with a collar portion (25) at the center thereof and on both upper and lower sides of the collar portion (25) of the vertical tubular portion (24). Are provided respectively.

Similar to the case of the first embodiment, the polymer raw material distributing groove (15) is formed in the inner surface of the peripheral wall (4) of the casing (1), and the polymer raw material compression inflow space (8) having a substantially wedge-shaped cross section. Are provided so as to be continuous with each other, a flow gap (9) is formed between the peripheral edge of the receiving plate (7) and the inner surface of the casing peripheral wall (4), and the collar portion of each ring-shaped spacer (23) is formed. (25) A gap (19) for flowing the liquid polymer raw material is formed by the peripheral edge and the portion of the distribution groove (15) on the inner surface of the casing peripheral wall (4). A core body (20) for each ring-shaped molded article is provided below the backing plate (7).
And a space (21) for polymer molding which is surrounded by the outer peripheral surface of the upper and lower spacers (23) and (23) and the inner peripheral surface of the casing peripheral wall (4) and is continuous with the above-mentioned flow gap (9) or (19). Has been.

Further, as shown in FIG. 5, at four points of the stepped portion (26) of each ring-shaped spacer (23) and the vertical tubular portion (24) above or below or both above and below the stepped portion (26). When the notch (27) in the radial direction is provided and the core body (20) for a molded article and the ring-shaped spacer (23) are combined with each other, the first air vent hole (22) is formed at the abutting portion thereof. It is forced. The second air vent hole (13) is formed at the center of the casing bottom wall (3) as in the case of the first embodiment.

While rotating this centrifugal molding apparatus, a liquid nozzle was used to inject a liquid polymer raw material into the inlet (5) at the center of the casing upper wall (2) from above. Here, the same polyurethane rubber raw material as in the case of the first embodiment was used as the liquid polymer raw material.

In the injected liquid polymer raw material, air bubbles are removed in advance in the compression inflow space (8), and only the liquid polymer raw material containing no air bubbles is provided on the lower side of the receiving plate (7).
It flows into one polymer molding space (21). Further, the air in each molding space (21) is gradually extruded into the core (20) through the first air vent hole (22), so that when the polymer raw material flows in and cures, The air in the molding space (21) is not trapped in the polymer.

When the molding space (21) is completely filled with the polymer raw material, the interior of the casing (1) is maintained at a predetermined temperature to cure the polymer raw material, and the ring-shaped core (20) is obtained.
The elastic roll (2) whose surface is covered with an elastic body (29)
8) was produced.

After molding, the casing bottom wall (3) was removed, and the four elastic rolls (28) shown in FIG. 6 could be taken out from the bottom of the casing (1). The elastic body (2) of the elastic roll (28) thus obtained is
Both ends and the outer peripheral surface of the 9) portion were appropriately polished to obtain an elastic roll (28) product. A shaft (not shown) was fitted into the product of the elastic roll (28) thus obtained, and the product was used as an elastic roll for a textile machine.

[Third Embodiment] FIGS. 7 to 9 show a third embodiment of the present invention. Here, the point different from the case of the first embodiment is that an elastic body (39) made of polyurethane rubber is formed on the outer peripheral surface of the horizontal portion (30a) of the core body (30) for a ring-shaped molded article having a substantially L-shaped cross section. ) Coated friction false twist disk for crimping synthetic fiber yarn (38) (see FIG. 9)
Is in the point of manufacturing. Here, the core (30) was made of polyacetal resin (containing 20% by weight of glass beads), and the core of the friction false twisting disk was used as it was. Further, in order to obtain a stronger bond between the core body (30) and the elastic body (39) after molding, a narrow annular ridge (34) is provided on the outer peripheral surface of the horizontal portion (30a) of the core body (30). Has been.

First, referring to FIG. 7, the configuration of the bottomed cylindrical casing (1) of the polymer centrifugal molding apparatus and the injection polymer raw material receiving plate (7) facing the liquid polymer raw material injection port (5) is the same as the first embodiment. It is similar to the embodiment.

Then, in the middle of the injected polymer raw material receiving plate (7) and the casing bottom wall (3), four ring-shaped cores (30) having a substantially L-shaped cross section are crossed in a ring shape. The five rectangular spacers (33) are arranged alternately and concentrically. Except for the lowermost ring-shaped spacer (33b), the remaining ring-shaped spacers (33), which are the first to fourth from the top, are the cores (30) for molded articles.
Of the concentric body (3
It is in contact with the outer peripheral surface of the vertical portion (30b) of (0). The lowermost ring-shaped spacer (33b) is placed on the upper surface of the casing bottom wall (3) and abutted on the lower surface of the horizontal portion (30a) of the lowest molded article core (30).

Similar to the case of the first embodiment, the polymer raw material distributing groove (15) is formed on the inner surface of the peripheral wall (4) of the casing (1), and the polymer raw material compression / inflow space (8) having a substantially wedge-shaped cross section. Are provided so as to be continuous with each other, and a circulation gap (9) is formed between the peripheral edge of the receiving plate (7) and the inner surface of the casing peripheral wall (4).
3) Distribution groove (1) on the peripheral edge and the inner surface of the casing peripheral wall (4)
5) and the gap for the flow of the liquid polymer raw material (1
9) is formed. Then, below the receiving plate (7), the horizontal portion (30) of each core body (30) for ring-shaped molded articles is formed.
a) A polymer molding space (31) surrounded by the outer peripheral surface, the upper and lower spacers (33) (33) and the inner peripheral surface of the casing peripheral wall (4) and connected to the polymer raw material distribution gaps (9) (19). It is provided.

Further, as shown in FIG. 8, among the ring-shaped spacers (33) in the stacked state, the uppermost ring-shaped spacers (33a) are radially and vertically aligned at four positions on the inner peripheral surface and the lower surface. Notches (35) are provided, and notches (35) are similarly provided in the radial direction and the vertical direction at four positions on the inner peripheral surface and the upper surface portion of the lowermost ring-shaped spacer (33b), and the middle portion is further formed. Notches (35) are provided in the radial direction and the vertical direction at four locations on the inner peripheral surface and the upper and lower surfaces of the ring-shaped spacer (33c) of FIG.
When the ring spacer (33) is combined with the ring-shaped spacer (33), the first air vent hole (32) is formed at the abutting portion thereof. The second air vent hole (13) is formed at the center of the casing bottom wall (3) as in the case of the first embodiment.

While the centrifugal molding apparatus was being rotated, the liquid polymer material was injected from above into the injection port (5) at the center of the casing upper wall (2) by the supply nozzle (16). As the liquid polymer raw material, a polyurethane rubber raw material [viscosity 800 cps, trade name Vulcolan (registered trademark), manufactured by Bayer GmbH, West Germany] was used.

The injected liquid polymer raw material is preliminarily devoid of bubbles in the compression inflow space (8), and only the liquid polymer raw material containing no bubbles is provided at the bottom of the receiving plate (7).
It flows into one poly 7-molding space (31). Further, the air in each molding space (31) is gradually pushed out into the core (30) through the first air vent hole (32), and therefore, when the polymer raw material flows in and cures, The air in the molding space (31) is not caught in the polymer.

When the molding space (31) is completely filled with the polymer raw material, the inside of the casing (1) is maintained at a predetermined temperature to cure the polymer raw material, and the core of the ring-shaped molded article having a substantially L-shaped cross section is formed. Friction false twisting disk (38) for crimping synthetic fiber yarn, wherein the outer peripheral surface of the horizontal portion (30a) of the body (30) is covered with an elastic body (39) made of polyurethane rubber.
Was manufactured.

After molding, the casing bottom wall (3) was removed, and four false twist disks (38) shown in FIG. 9 could be taken out from the bottom of the casing (1) at a time. In addition, the friction false twist disc (3
The elastic body (39) part of 8) was ground to obtain a friction false twist disc (38) product. In this case, a narrow annular ridge (34) is provided on the outer peripheral surface of the horizontal portion (30a) of the core body (30), and it goes without saying that the elastic body (39) does not contain bubbles. The joint portion between the body (30) and the elastic body (39) does not contain bubbles, and the core body (30) and the elastic body (3) are not included.
A stronger bond with 9) was obtained and the friction false twist disc (38) product had excellent quality.

[Fourth Embodiment] FIGS. 10 to 12 show a fourth embodiment of the present invention. Here, the point different from the case of the first embodiment is that the power transmission V-belt (48) (see FIG. 12) made of polyurethane rubber is manufactured.

First, referring to FIG. 10, the structure of a bottomed cylindrical casing (1) of a polymer centrifugal molding apparatus and an injection polymer raw material receiving plate (7) arranged so as to face the liquid polymer raw material injection port (5). Is similar to the first embodiment.

A total of five ring-shaped spacers (43) are arranged in a stack between the injected polymer raw material receiving plate (7) and the casing bottom wall (3). Among the stacked ring-shaped spacers (43), a taper surface (46) tapering downward is provided on the lower surface of the uppermost ring-shaped spacer (43a) and an upper surface of the lowermost ring-shaped spacer (43b) is directed upward. Taper surface (4
7) is provided and three intermediate ring spacers (43
Tapered surfaces (46) and (47) tapering upward and downward are provided on the upper and lower surfaces of C).

Further, as in the case of the first embodiment, the concave groove for polymer raw material distribution (15) is formed in the inner surface of the peripheral wall (4) of the casing (1), and the polymer raw material compression inflow space (8) having a substantially wedge-shaped cross section. ), A circulation gap (9) is formed between the periphery of the receiving plate (7) and the inner surface of the casing peripheral wall (4), and the periphery of each ring-shaped spacer (43) and the casing. A distribution gap (19) for the liquid polymer raw material is formed in the inner surface of the peripheral wall (4) with the distribution groove (15). On the lower side of the receiving plate (7), ring-shaped spacers (43) (4
3) and the inner peripheral surface of the casing peripheral wall (4) and a cross-section substantially V which is continuous with the above-mentioned flow gaps (9) (19)
A shaped polymer molding space (41) is provided.

Also, as shown in FIG. 11, notches (45) are provided in the radial direction at four locations on the lower surface of the uppermost ring-shaped spacer (43a) of the stacked ring-shaped spacers (43). Also, notches (45) are similarly provided in the radial direction at four positions on the upper surface of the lowest ring-shaped spacer (43b), and further four positions on both upper and lower surfaces of the intermediate ring-shaped spacer (43c). In each case, when notches (45) are provided in the radial direction and these ring-shaped spacers (43) are overlapped with each other, vertically adjacent ring-shaped spacers (43)
(43) The first air vent hole (4
2) is formed. The casing bottom wall (3)
The point that the second air vent hole (13) is formed in the central part of is the same as the case of the first embodiment.

While the centrifugal molding apparatus was being rotated, the liquid polymer material was injected from above into the injection port (5) at the center of the casing upper wall (2) by the supply nozzle (16). Here, as the liquid polymer raw material, a polyurethane rubber raw material [viscosity 800 cps, trade name Hyprene (registered trademark)]
L-100, manufactured by Mitsui Toatsu Chemicals, Inc.] was used.

In the injected liquid polymer raw material, air bubbles are removed in advance in the compression inflow space portion (8), and only the liquid polymer raw material containing no air bubbles is provided on the lower side of the receiving plate (7).
It flows into one polymer molding space (41). Further, the air in each molding space (41) is gradually pushed out into the ring-shaped spacer (43) through the first air vent hole (42), so that when the polymer raw material flows in and cures. The air in the molding space (41) is not caught in the polymer.

When a predetermined amount of the polymer raw material flows into the molding space (41), the inside of the casing (1) is maintained at a predetermined temperature to cure the polymer raw material, and thus the inner peripheral surface is V-shaped. V belt (48) for power transmission was manufactured. After molding, the casing bottom wall (3) was removed, and four V-belts (48) shown in FIG. 12 could be taken out from the bottom of the casing (1) at a time.

Since the other points of the second to fourth embodiments are similar to those of the first embodiment, the same parts are designated by the same reference numerals in the drawings. In addition, the second to fourth examples are for mass production of the elastic roll (28), the friction false twist disc (38) for crimping synthetic fiber yarn, and the V belt (48). The core body or the spacer may be arranged so that a plurality of these products can be manufactured. Although the casing (1) is arranged in the vertical direction in the first to fourth embodiments, the casing (1) may be arranged in the horizontal direction, as a matter of course. Also, the second
In the embodiment and the third embodiment, the first air vent holes (22) (32) have the ring-shaped spacers (23) (3).
Although it is formed by providing the notches (27) and (35) in 3), it goes without saying that these air notches may be provided on the core body (20) (30) side. According to the polymer centrifugal molding apparatus of the present invention, in addition to the rolls, disks, and belts shown in the above-described examples, elastic bodies used for various applications such as tubes, sheets, and cots can be manufactured. It is a thing.

[0074]

As described above, the polymer centrifugal molding apparatus according to the first aspect of the present invention has the liquid polymer raw material inlet in the center of the upper wall and the rotary shaft attached to the lower surface of the center of the bottom wall. At the same time, at least one of the upper wall and the bottom wall is detachable with respect to the peripheral wall, and a bottomed cylindrical casing, and an injection polymer raw material receiver arranged so as to face the polymer raw material injection port inside the casing upper wall. Plate, and a receiving plate and a core for a cylindrical molded article that is arranged between the receiving plate and the bottom wall of the casing, and between the inner surface of the upper wall of the casing and the injection plate for the injected polymer raw material A polymer raw material compression inflow space having a substantially wedge-shaped cross section is formed which gradually tapers from the inlet to the peripheral edge, and the required portion of the peripheral edge of the receiving plate and the inner surface of the casing peripheral wall are formed. A gap for circulation of the liquid polymer raw material that has been degassed by compression is provided between the compliant portion and the outer peripheral surface of the molded article core body and the inner peripheral surface of the casing peripheral wall below the receiving plate. A polymer molding space that is continuous with the flow gap is provided, and a first air vent hole is provided at a required location on the peripheral wall of the molded article core body, and a second air vent hole is provided at a required location on the casing bottom wall. It is a thing.

Next, according to a second aspect of the present invention, a ring-shaped molded article core and a ring-shaped spacer having a collar portion are alternately provided between the injected polymer raw material receiving plate and the casing bottom wall. The ring-shaped spacers are arranged on both upper and lower sides of the molded article core body, and the liquid polymer raw material is provided between the required portion of the flange peripheral edge of each ring-shaped spacer and the corresponding portion of the inner surface of the casing peripheral wall. A circulation gap is provided under the receiving plate, which is surrounded by the outer peripheral surface of each ring-shaped molded article core body, the upper and lower spacers, and the inner peripheral surface of the casing peripheral wall, and which is continuous with the circulation gap. A space is provided, and a first air vent hole is formed at a required position of the contact portion between the ring-shaped molded article core and the ring spacer, and a second air vent hole is provided at a required position of the casing bottom wall. It is what is kicked.

According to a third aspect of the present invention, a ring-shaped molded article core having a substantially L-shaped cross section and a ring-shaped spacer are alternately provided in the middle of the injected polymer raw material receiving plate and the casing bottom wall. The ring-shaped spacers are arranged on both upper and lower sides of the molded article core body, and a gap for circulation of the liquid polymer raw material is provided between a required portion of each ring-shaped spacer peripheral edge and a corresponding portion of the inner surface of the casing peripheral wall. A space for polymer molding which is provided below the receiving plate and which is surrounded by the outer peripheral surface of the horizontal portion of each ring-shaped molded article, the upper and lower spacers and the inner peripheral surface of the casing peripheral wall, and which is continuous with the distribution gap. Is provided, and a first air vent hole is formed at a required position of the contact portion between the ring-shaped molded article core and the ring spacer, and a second air vent hole is provided at a required position of the casing bottom wall. It is what is.

Finally, in the fourth aspect of the present invention, at least three ring-shaped spacers are arranged in a stack between the injected polymer raw material receiving plate and the casing bottom wall, and the ring-shaped spacers in the stacked state are arranged. Of the uppermost ring-shaped spacers, a taper surface that tapers downward is provided on the lower surface, and a taper surface that tapers upward is provided on the upper surface of the lowest ring-shaped spacer. Is provided with taper surfaces that taper upward and downward, respectively, and a gap for flowing the liquid polymer raw material is provided between a required portion of each peripheral edge of the ring-shaped spacer and a corresponding portion of the inner surface of the casing peripheral wall. A substantially V-shaped cross section that is surrounded by the ring spacers vertically adjacent to each other and the inner peripheral surface of the casing peripheral wall on the lower side and is continuous with the above-mentioned flow gap. The polymer molding space is provided, and the first air vent holes are formed at the required positions of the contact portions of the vertically adjacent ring spacers, and the second air vent holes are formed at the required positions of the casing bottom wall. It is a thing.

According to the present invention described above, in any case, the removal of the bubbles in the liquid polymer raw material is not carried out only by the separation by the centrifugal force in the casing, but is preliminarily centrifuged in the injected polymer compression inflow space. After removing air bubbles using force, only the defoamed polymer raw material is injected into the molding space, and the bubbles and air are removed by applying centrifugal force in the molding space, so to speak, in two stages. Since the bubbles are removed in step 1, the polymer can be molded by sufficiently removing the bubbles.

Therefore, according to the present invention, various rotationally symmetric articles, which have been very difficult to be centrifugally formed in the past, are produced, that is, articles having a small inner diameter or a large wall thickness, and a core body and an elastic body. The integral molding, and further the integral molding of the core body having a complicated shape and the elastic body can be carried out by utilizing centrifugal molding. Further, in the production of the belt of the fourth invention, a belt having a special shape not only on the outer peripheral surface but also on the inner peripheral surface can be produced by the centrifugal molding method.

Further, according to the present invention, air bubbles in all products can be effectively removed, which contributes to the improvement of quality and has excellent mass productivity, and is suitable for elastic rolls and synthetic fiber yarn crimps. The effect is that elastic product such as friction false twist disk or belt can be supplied to the market at low cost.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a polymer centrifugal molding apparatus for producing an elastic roll according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view of an elastic roll product manufactured in the first embodiment.

FIG. 4 is a schematic vertical sectional view of a polymer centrifugal molding apparatus for producing elastic rolls according to a second embodiment of the present invention.

FIG. 5 is an enlarged perspective view of a spacer with a collar portion used in FIG.

FIG. 6 is a partially enlarged perspective view of an elastic roll product manufactured in the second embodiment.

FIG. 7 is a schematic vertical sectional view of a polymer centrifugal molding apparatus for producing a friction false-twist disk for crimping synthetic fiber yarn according to a third embodiment of the present invention.

FIG. 8 is an enlarged perspective view of the ring-shaped spacer used in FIG.

FIG. 9 is a partially enlarged perspective view of a friction false-twist disk product for crimping synthetic fiber yarn manufactured in a third example.

FIG. 10 is a schematic vertical sectional view of a polymer centrifugal molding apparatus for manufacturing a belt according to a fourth embodiment of the present invention.

11 is a partially enlarged perspective view of the ring-shaped intermediate spacer used in FIG.

FIG. 12 is a partially enlarged perspective view of a belt product manufactured in a fourth embodiment.

[Explanation of symbols]

 1 Bottomed Cylindrical Casing 2 Top Wall 3 Bottom Wall 4 Circumferential Wall 5 Liquid Polymer Raw Material Injecting Port 6 Rotating Shaft 7 Injection Polymer Raw Material Receiving Plate 8 Cross Section Wedge Polymer Raw Material Compressing Inflow Space 9 For Distribution of Degassed Liquid Polymer Raw Material Gap 10 Cylindrical molded article core 10a Peripheral wall 11 Polymer molding space 12 First air vent hole 13 Second air vent hole 18 Elastic roll 19 Liquid polymer raw material flow gap 20 Ring-shaped molded article core 21 Polymer Molding space 22 First air vent hole 23 Ring-shaped spacer 25 Collar portion 28 Elastic roll 30 Ring-shaped molded article core body 30a Horizontal portion 31 Polymer molding space 32 First air vent hole 33 Ring-shaped spacer 38 False twist disc 41 Polymer molding space 42 First air vent hole 43 Ring-shaped spacer 43a Uppermost ring-shaped spacer 43b Lowermost ring-shaped spacer 43c Intermediate ring-shaped spacer 46 Tapered surface tapering downward to the lower surface 47 Tapered surface tapering upward 48 V-belt

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display area B29L 29:00 4F

Claims (4)

[Claims] 1. A liquid polymer raw material injection port (5) is provided in the central portion of the upper wall (2), and a rotating shaft (6) is attached to the lower surface of the central portion of the bottom wall (3) and the peripheral wall (4) is attached. A bottomed cylindrical casing (1) in which at least one of the upper wall (2) and the bottom wall (3) is detachable,
An injection polymer raw material receiving plate (7) arranged to face the polymer raw material injection port (5) inside the casing upper wall (2), and an intermediate portion between the receiving plate (7) and the casing bottom wall (3). Cylindrical core for molded article (1
0), and between the inner surface of the upper wall (2) of the casing (1) and the injected polymer raw material receiving plate (7), the polymer raw material injection port (5) in the central portion is centered to reach the peripheral edge. A polymer raw material compression inflow space (8) having a substantially wedge-shaped cross section is formed so as to be gradually tapered, and between the required portion of the peripheral edge of the receiving plate (7) and the corresponding portion of the inner surface of the casing peripheral wall (4).
A gap (9) for flowing the liquid polymer raw material that has been degassed by compression is provided, and the outer peripheral surface of the molded article core (10) and the inner peripheral surface of the casing peripheral wall (4) are provided below the receiving plate (7). A space (11) for polymer molding, which is continuous with the above-mentioned gap (9) for distribution, is provided between the cores (1).
0) at the required location on the peripheral wall (10a) of the first air vent hole (1
2) A centrifugal molding apparatus for polymers, in which the second air vent hole (13) is opened at a required position of the casing bottom wall (3) while the second air vent hole (2) is opened. 2. The liquid polymer raw material injection port (5) is provided in the central portion of the upper wall (2), and the rotating shaft (6) is attached to the lower surface of the central portion of the bottom wall (3), and with respect to the peripheral wall (4). A bottomed cylindrical casing (1) in which at least one of the upper wall (2) and the bottom wall (3) is detachable,
An injection polymer raw material receiving plate (7) arranged so as to face the polymer raw material inlet (5) inside the casing upper wall (2) and an intermediate portion between the receiving plate (7) and the casing bottom wall (3). And a ring-shaped spacer (23) having a ring-shaped molded article core (20) and a collar portion (25) arranged in the interior of the casing (1), the inner surface of the upper wall (2) and the injected polymer raw material. Between the support plate (7) and the polymer raw material injection port (5) in the center, a polymer raw material compression inflow space portion (8) having a substantially wedge-shaped cross section is formed which gradually tapers toward the peripheral edge. A ring-shaped spacer (23) is provided between a required portion of the peripheral edge of the receiving plate (7) and a corresponding portion of the inner surface of the casing peripheral wall (4) to provide a flow gap (9) for passing the liquid polymer raw material degassed by compression. ) Is a core for molded articles ( 0) on both upper and lower sides of the ring-shaped spacer (23), and a gap for circulation of the liquid polymer raw material between a required portion of the peripheral edge of the collar portion (25) and a corresponding portion of the inner surface of the casing peripheral wall (4). (19) is provided, and on the lower side of the receiving plate (7), the outer peripheral surface of each core body (20) for ring-shaped molded articles, the upper and lower spacers (23) (23), and the inner peripheral surface of the casing peripheral wall (4). A space (21) for polymer molding, which is surrounded by and is continuous with the above-mentioned distribution gaps (9) and (19), is provided, and a ring-shaped molded article core (2) is provided.
0) and the ring-shaped spacer (23) are provided with a first air vent hole (22) at a required position in the contact portion, and
The second air vent hole (1
3) An apparatus for centrifugal molding of polymer, in which is opened. 3. A liquid polymer raw material injection port (5) is provided in the central portion of the upper wall (2), and a rotary shaft (6) is attached to the lower surface of the central portion of the bottom wall (3), and with respect to the peripheral wall (4). A bottomed cylindrical casing (1) in which at least one of the upper wall (2) and the bottom wall (3) is detachable,
An injection polymer raw material receiving plate (7) arranged so as to face the polymer raw material inlet (5) inside the casing upper wall (2) and an intermediate portion between the receiving plate (7) and the casing bottom wall (3). And a ring-shaped spacer (33) having a substantially L-shaped cross section disposed in the inner surface of the casing (1), the inner surface of the upper wall (2) of the casing (1), and the injected polymer raw material receiving plate. A polymer raw material compression inlet / outlet space (8) having a substantially wedge-shaped cross section is formed between (7) and a central portion of the polymer raw material injection port (5), and the taper is gradually tapered toward the peripheral edge. (7) A ring-shaped spacer (33) is provided between the required portion of the peripheral edge and a corresponding portion of the inner surface of the casing peripheral wall (4) to provide a flow gap (9) for the liquid polymer raw material degassed by compression. Core for molded article (30) Disposed on both the upper and lower sides, a liquid polymer raw material flow gap (19) is provided between a required portion of the peripheral edge of each ring-shaped spacer (33) and a corresponding portion of the inner surface of the casing peripheral wall (4), and a receiving plate On the lower side of (7), the horizontal portion (30) of the core body (30) for each ring-shaped molded article is formed.
a) A polymer molding space (3) surrounded by the outer peripheral surface, the upper and lower spacers (33) (33), and the inner peripheral surface of the casing peripheral wall (4) and continuous with the above-mentioned flow gaps (9) (19).
1) is provided, a first air vent hole (32) is opened at a required position of a contact portion between the ring-shaped molded article core body (30) and the ring-shaped spacer (33), and the casing bottom wall (3). (2) A centrifugal molding apparatus for polymer, wherein a second air vent hole (13) is formed at a required position of (1). 4. The upper wall (2) has a liquid polymer raw material injection port (5) in the central portion thereof, and the rotary shaft (6) is attached to the lower surface of the central portion of the bottom wall (3), and the liquid polymer raw material injection port (5) is attached to the peripheral wall (4). A bottomed cylindrical casing (1) in which at least one of the upper wall (2) and the bottom wall (3) is detachable,
The injection polymer raw material receiving plate (7) arranged so as to face the polymer raw material injection port (5) inside the casing upper wall (2), and stacked between the receiving plate (7) and the casing bottom wall (3). Of at least three ring-shaped spacers (43) arranged in a line, and between the inner surface of the upper wall (2) of the casing (1) and the injected polymer raw material receiving plate (7), the polymer raw material pouring in the central portion is injected. A polymer raw material compression inflow space portion (8) having a substantially wedge-shaped cross section is formed, which is gradually tapered from the inlet (5) toward the periphery of the inlet plate (5), and the required portion of the peripheral edge of the receiving plate (7) and the casing peripheral wall (4) are formed. Below the uppermost ring-shaped spacer (43a) of the stacked ring-shaped spacers (43), a gap (9) for flowing the liquid polymer material degassed by compression is provided between the inner surface and the corresponding part. The tapered surface tapers downwardly (46) is provided, tapers upwardly to the upper surface of the lowermost ring-shaped spacer (43 b) the tapered surface (4
7) is provided, and tapered surfaces (46) (47) that taper upward and downward, respectively, are provided on the upper and lower surfaces of the intermediate ring-shaped spacer (43c), and the required portions of the periphery of each ring-shaped spacer (43) are provided. A gap (19) for circulating the liquid polymer raw material is provided between the inner wall of the casing peripheral wall (4) and the corresponding portion, and the ring-shaped spacers (43) (adjacent to the bottom) are provided below the receiving plate (7). 43) and the inner peripheral surface of the casing peripheral wall (4) and a polymer molding space (41) having a substantially V-shaped cross section which is continuous with the above-mentioned flow gaps (9) (19) and which are vertically adjacent to each other. A first air vent hole (42) is formed at a required position of the abutting portions of the ring spacers (43) (43) to be fitted, and a second air vent hole (13) is opened at a required position of the casing bottom wall (3). Is poly Over centrifugal molding apparatus.