WO2020071215A1

WO2020071215A1 - Molding method

Info

Publication number: WO2020071215A1
Application number: PCT/JP2019/037736
Authority: WO
Inventors: 誉也新實; 洋介林; 健一村尾
Original assignee: キョーラク株式会社
Priority date: 2018-10-03
Filing date: 2019-09-26
Publication date: 2020-04-09

Abstract

[Problem] To provide a molding method with which it is possible to significantly improve molding efficiency. [Solution] A first sheet-shaped resin and a second sheet-shaped resin in a molten state extruded from an extruder are directly dropped downward to be arranged between divided molds. Air between one divided mold and the first sheet-shaped resin is depressurized to bring the first sheet-shaped resin into intimate contact with a mold cavity of the one divided mold, and air between the other divided mold and the second sheet-shaped resin is depressurized to bring the second sheet-shaped resin into intimate contact with a mold cavity of the other divided mold. Mold closing is performed with an intermediate mold interposed between the divided molds brought into intimate contact with the respective sheet-shaped resins. The intermediate mold has protrusion parts butted against the outsides of outer edges of the mold cavities of the respective divided molds.

Description

Molding method

{Circle over (1)} The present invention relates to a molding method for vacuum molding a resin sheet, and more particularly to a molding method capable of efficiently molding a molded article.

方法 As a method of molding various molded products, a method of thermoforming (vacuum molding) a resin sheet is known. For example, Patent Document 1 discloses a vacuum forming method of a sheet in which a heat-softened forming sheet is brought into suction contact with a forming die having irregularities on a forming surface by a vacuum suction means to form the sheet. There has been proposed a technique for preventing the thickness from becoming thin and preventing the thickness from being reduced.

In this type of vacuum forming method, it is common to put the resin into a sheet in advance, and then place the sheet for molding softened by heating at the time of molding to perform the molding, but realize more efficient molding Therefore, a molding method combining primary molding by extrusion and secondary molding by vacuum has also been proposed. According to such a molding method, the extruded molten resin sheet is used as it is, and is vacuum-molded, so that the once molded resin is re-heated. It is possible to mold the part without causing problems.

In particular, the extruded molten resin sheet is drooped downward as it is, and the vertically extending resin sheet is clamped to form a vacuum so that the resin is extruded in the secondary direction, as compared with the case where the resin is extruded in the lateral direction. It is possible to feed the resin sheet out of the extrusion die in a non-contact state without having to support the molten resin sheet until the mold is closed.

JP-A-2003-260731

In recent years, in the field of plastic molding, further improvement in molding efficiency has been demanded, and the extruded molten resin sheet is drooped downward as it is, and the vertically extending resin sheet is clamped by vacuum forming. There is also a demand for an improved method.

The present invention has been proposed in view of the above-mentioned conventional circumstances, and has as its object to provide a molding method capable of significantly improving molding efficiency.

In order to achieve the above object, a molding method according to a first invention of the present application is a method in which a molten first sheet-like resin and a second sheet-like resin extruded from an extruder are directly dropped downward and divided. The first sheet-shaped resin is placed between the molds, and the air between the one divided mold and the first sheet-shaped resin is depressurized to bring the first sheet-shaped resin into close contact with the mold cavity of one of the divided molds, while the other divided The second sheet-shaped resin is brought into close contact with the mold cavity of the other divided mold by reducing the pressure of the air between the mold and the second sheet-shaped resin. It is characterized in that the mold is interposed and the mold is clamped.

In the molding method of the first invention of the present application, two sheet-shaped resins are simultaneously vacuum-formed by two split molds, so that the molding is performed twice as much as in the case of molding one sheet-shaped resin. Efficiency is obtained. In vacuum molding, the treatment of burrs remaining around the molded article becomes a problem. However, in the molding method of the present invention, since the intermediate mold is interposed and the mold is clamped, the peripheral mold is formed around each divided mold. In this case, the sheet-shaped resin is cut off, and the burr treatment is easy.

On the other hand, in the method in which the extruded molten resin sheet is dripped downward as it is, and the resin sheet extending in the vertical direction is clamped by vacuum forming, for example, when a concave molded product is formed, uneven cooling may occur. In some cases, inconveniences such as deformation of the molded product may occur. In the vacuum molding, when using a divided mold, as a method of cooling the surface of the sheet-shaped resin that is not formed in the mold, the entrance and exit of the refrigerant with respect to the entire closed space partitioned by the parting line. It is conceivable to provide convection by providing about one or two systems. However, in this case, the flow of the fluid (refrigerant) cannot be regulated, and the fluid velocity tends to be uneven in some places, and the whole cannot be uniformly cooled due to the occurrence of a stagnation point or the like.

第 The second invention of the present application has been devised to solve such inconvenience. That is, in the molding method of the second invention of the present application, the molten sheet-like resin extruded from the extruder is suspended downward, and disposed between the molding die and the closed space forming die. When the sheet-shaped resin is brought into close contact with the mold cavity of the molding die by reducing the pressure between the mold and the sheet-shaped resin, a plurality of surfaces are formed on the surface of the closed space forming mold facing the molding die. The fins are arranged substantially in parallel, and in each area divided by the fins, cooling by air is performed from the closed space forming mold side.

Furthermore, the configuration of the second invention of the present application can be combined with the configuration of the first invention of the present application. This is the third invention of the present application. That is, in the molding method of the third invention of the present application, the first sheet resin and the second sheet resin in a molten state extruded from an extruder are drooped downward as they are and arranged between the split molds, The first sheet-shaped resin is brought into close contact with the mold cavity of one of the divided molds by reducing the pressure of the air between one divided mold and the first sheet-shaped resin, and the other divided mold and the second sheet-shaped resin. The second sheet-shaped resin is brought into close contact with the mold cavity of the other divided mold by reducing the pressure of the air between the resins, and the facing surface of each divided mold with each sheet-shaped resin facing each divided mold. In this method, an intermediate mold having a plurality of fins arranged substantially in parallel is interposed therebetween, and after clamping, the mold is cooled by air from the intermediate mold side.

In the molding method according to the second and third aspects of the present invention, fins for rectification are provided to perform cooling by the refrigerant (air), so that the refrigerant flows into the space regulated by the fins. Combined with the fact that the speed of the refrigerant is improved and that the flow of the refrigerant is likely to be turbulent, the surface of the sheet-shaped resin that is not shaped in the mold is cooled more uniformly and promptly, and the accuracy is improved. High vacuum forming is realized.

According to the first invention of the present application, it is possible to provide a molding method capable of significantly improving molding efficiency as compared with a method of molding a sheet-like resin one by one. Further, according to the present invention, burr treatment is easy, and in this regard, molding efficiency can be improved.

According to the second aspect of the present invention, it is possible to suppress the occurrence of deformation due to non-uniform cooling, and to realize highly accurate vacuum forming.

It is a figure which shows the shaping | molding process in the shaping | molding method of 1st Embodiment in a process order, and is a figure which shows the process of hanging a sheet-shaped resin. It is a figure which shows the process which makes a mold advance and adsorbs a sheet-like resin to a mold. It is a figure which shows the process which retreats a mold frame and starts suction in a mold cavity. It is a figure which shows the shaping process of a sheet-like resin by vacuum suction. It is a figure which shows a mold clamping process. It is a figure which shows the molded article taken out. It is a figure which shows the shaping | molding process in the shaping | molding method of 2nd Embodiment in a process order, and is a figure which shows the process of hanging a sheet-shaped resin. It is a figure which shows the shaping process of a sheet-like resin by vacuum suction and cooling by air. FIG. 4 is a schematic front view showing a surface of the mold for forming a closed space facing a molding die. FIG. 2 is a schematic cross-sectional view showing a cross section of a molding die and a closed space forming die in a mold closed state. It is a figure which shows the shaping | molding process in the shaping | molding method of 3rd Embodiment in order of a process, and is a figure which shows the process of hanging a sheet-shaped resin. It is a figure which shows the shaping process of a sheet-like resin by vacuum suction and cooling by air. 3 shows an example of a forming method for forming an inner rib. 9 shows another example of a molding method for forming an inner rib.

Hereinafter, an embodiment of a molding method to which the present invention is applied will be described in detail with reference to the drawings.

(First embodiment)
In the molding method of the present embodiment, two sheet-like resins extruded from an extruder are simultaneously vacuum-molded by two split molds having mold cavities opposed to each other. Therefore, two molded products can be molded simultaneously by one-time clamping, and a molding efficiency twice as high as that of ordinary vacuum molding can be realized.

Here, first, the molding apparatus used in the molding of the present embodiment will be described. As shown in FIG. 1, the molding apparatus includes two extruders 1 from which the sheet-shaped resin droops from each of the extruders 1. It is extruded in the form.

Each extruder 1 is a conventionally known type, and detailed description thereof is omitted, but a cylinder 12 provided with a hopper 11, a screw (not shown) provided in the cylinder 12, and a screw connected to the screw. A hydraulic motor 13, an accumulator 14 in which the inside of the cylinder 12 communicates with the cylinder 12, and a plunger 15 provided in the accumulator 14. The molten resin is melted and kneaded by the rotation of the screw, and the molten resin is transferred to the accumulator 14 and stored in a certain amount. The molten resin is sent toward the T-die 16 by driving the plunger 15, and the continuous Resin is extruded, and a pair of rollers 18 are arranged at intervals. While being pressed is fed downward.

Below the extruder 1, two split

molds

21 and 22 are arranged so that the

mold cavities

21A and 22A are opposed to each other, and an intermediate mold 23 is arranged on these two split

molds

21 and 22. Have been. Each of the

split molds

21 and 22 has a plurality of vacuum suction holes 21B and 22B facing the inner surfaces (molding surfaces) of the

mold cavities

21A and 22A. Further, on the outer peripheral portion of each of the

split molds

21 and 22,

molds

31 and 32 are provided so as to be able to advance and retreat. In addition, the

vacuum suction holes

31A and 32A are also provided in the mold frames 31 and 32, respectively, facing the surfaces in contact with the sheet-like resin.

The intermediate mold 23 has one abutment surface 23A in contact with the split mold 21 and the other abutment surface 23B in contact with the split mold 22. Each abutment surface 23A, 23b has The split

molds

21 and 22 have

protrusions

23C and 23D which are abutted along the outer periphery of the

mold cavities

21A and 22A. The projecting

portions

23C and 23D of the intermediate mold 23 abut against the outside of the

mold cavities

21A and 22A of the

split molds

21 and 22, and the sheet-like resin is sandwiched, so that the outer peripheral portion of the formed sheet-like resin is reduced. It becomes a cut-out shape, and it becomes easy to remove burrs on the outside of the molded product.

In addition, in the present embodiment, the intermediate mold 23 has an annular structure corresponding to the outer peripheral shape thereof according to the shapes of the

mold cavities

21A and 22A of the

split molds

21 and 22. That is, the intermediate mold 23 has a shape in which the center portion is hollowed out. By forming the intermediate mold 23 as a hollow annular structure as described above, there is an advantage in that cost can be reduced due to reduction of mold raw materials and the molding device can be reduced in weight.

The above-described molding apparatus is based on vacuum molding, and therefore, the intermediate mold 23 does not require a special mechanism such as an air blowing mechanism.

Next, the molding steps in the molding method of the present embodiment will be described in the order of the steps.

In the molding method according to the present embodiment, first, as shown in FIG. 1, the sheet resins S1 and S2 are continuously extruded from the extrusion slit 17 of each extruder 1. In the extruded sheet resins S1 and S2, the extrusion speed and the feeding speed at which the sheet resins S1 and S2 are fed downward by the pair of rollers 18 according to the extrusion speed of the respective sheet resins S1 and S2. Is adjusted by adjusting the rotation speed of the pair of rollers 18, and when the sheet-like resins S 1 and S 2 pass between the pair of rollers 18, the sheet-like resins S 1 and S 2 are pulled downward by the pair of rollers 18. As a result, the sheet-like resins S1 and S2 are stretched and thinned, and as a result, drawdown or neck-in is effectively prevented. The adjustment of the interval between the extrusion slits 17 may be performed in conjunction with the adjustment of the rotation speed of the pair of rollers 18.

The thermoplastic material used for the sheet-like resins S1 and S2 is arbitrary. For example, a polyethylene resin, a polypropylene resin, an ethylene-vinyl acetate copolymer, a vinyl chloride resin, an ABS resin (acrylonitrile- (Styrene-butadiene resin), polyamide resin, polystyrene resin, polyester resin, and engineering plastics such as polycarbonate and modified polyphenylene ether. Further, a foamed resin or the like can be used.

シート The sheet resins S1 and S2 which are extruded from the extrusion slits 17 of the respective extruders 1 and stretched and thinned are suspended between the

split molds

21 and 22 and the intermediate mold 23. At this time, the mold frames 31 and 32 provided in each of the

split molds

21 and 22 are in a retracted state. That is, the tip surfaces of the mold frames 31 and 32 are substantially flush with the opposing surfaces of the

split molds

21 and 22.

Next, as shown in FIG. 2, the

molds

31 and 32 of the

split molds

21 and 22 are advanced (that is, moved toward the sheet-like resins S1 and S2), and each of the sheet-like resins S1 and S2 is moved. Make contact with the main surface. At this time, vacuum suction is performed by the

vacuum suction holes

31A and 32A provided in the

molds

31 and 32, and the sheet-shaped resins S1 and S2 are adsorbed to the

molds

31 and 32. As a result, a sealed space is formed by the respective sheet-shaped resins S1, S2, the corresponding

molds

31, 32, and the

mold cavities

21A, 22A.

Subsequently, as shown in FIG. 3, the

molds

31 and 32 are retracted to their original positions in a state where the sheet-shaped resins S1 and S2 are sucked, and the sheet-shaped resins S1 and S2 are brought into contact with the

split molds

21 and 22. After that, suction from the mold vacuum suction holes 21B and 22B provided in the

mold cavities

21A and 22A of the

split molds

21 and 22 is started.

The air in the sealed spaces (

mold cavities

21A, 22A) is sucked from the mold vacuum suction holes 21B, 22B provided in the

mold cavities

21A, 22A of the divided

molds

21, 22, as shown in FIG. As described above, the sheet-shaped resins S1 and S2 are adsorbed on the inner surfaces of the corresponding

mold cavities

21A and 22A, respectively, so that the sheet-shaped resins S1 and S2 are respectively formed on the inner surfaces (molding surfaces) of the corresponding

mold cavities

21A and 22A. ).

(5) Next, as shown in FIG. 5, the molding die including the split dies 21 and 22 and the intermediate die 23 is clamped. The divided

molds

21 and 22 are butted via the intermediate mold 23 by the mold clamping. That is, one abutment surface 23 A of the intermediate mold 23 contacts the split mold 21, and the other abutment surface 23 B contacts the split mold 22. As a result, the sheet-shaped resin S1 is sandwiched between the one abutting surface 23A of the intermediate mold 23 and the split mold 21, and the sheet-like resin S1 is sandwiched between the other abutting surface 23B of the intermediate mold 23 and the split mold 22. The resin S2 is sandwiched between the

molds

21A, 23B of the intermediate mold 23 along the outer peripheral edges of the

mold cavities

21A, 22A of the divided

molds

21, 22. Each of the sandwiched sheet-like resins S1 and S2 is cut off by the

projections

23C and 23D.

FIG. 6 shows molded

articles

41 and 42 taken out of the mold. The molded

products

41 and 42 formed by shaping the sheet-shaped resins S1 and S2 in the

mold cavities

21A and 22A of the

split molds

21 and 22 have burrs b on the outer periphery thereof. The

cutout portions

41a and 42a having a small thickness are formed by the cutout by 23D. The

cutout portions

41a and 42a can be easily cut off, and the burr b on the outer peripheral portion can be easily dropped.

In the above-described embodiment, molding can be performed with twice the efficiency as compared with the case where one sheet of resin is molded. Deburring after molding is also easy. Together with these effects, it is possible to greatly improve the molding efficiency despite the simple change of interposing an intermediate mold.

(Second embodiment)
The molding method of the present embodiment is a closed space forming mold for forming a closed space by abutting the molding resin when forming the sheet resin extruded from the extruder by vacuum molding with the molding die. Are provided with rectifying fins to achieve uniform cooling.

成形 The molding apparatus used in the present embodiment includes an extruder 1 as shown in FIG. 7, and a sheet-like resin is extruded from the extruder 101 in a hanging manner. The extruder 101 includes a cylinder 112 provided with a hopper 111, a screw (not shown) provided in the cylinder 112, a hydraulic motor 113 connected to the screw, and an accumulator 114 that communicates with the cylinder 112. , A plunger 115 provided in the accumulator 114. The resin pellets supplied from the hopper 111 are melted and kneaded by the rotation of a screw by a hydraulic motor 113 in a cylinder 112, and the resin in a molten state is transferred to an accumulator 114 and stored in a fixed amount. Thereafter, the molten resin is sent toward the T-die 116 by driving the plunger 115, and the continuous sheet-shaped resin S is extruded through the extrusion slit 117, while being pressed by a pair of rollers 118 arranged at intervals. It is sent downward.

成形 Below the extruder 101, a molding die 122 and a closed space forming die 140 are arranged so as to face each other. A plurality of vacuum suction holes 122B are formed in the molding die 122 so as to face the inner surface (molding surface) of the mold cavity 122A. A mold 132 is provided on the outer periphery of the molding die 122 so as to be able to advance and retreat. The mold frame 132 is also provided with a vacuum suction hole 132A facing the surface in contact with the sheet-shaped resin S.

The closed space forming mold 140 is configured to abut the forming mold 122 to form a closed space. The closed space forming mold 141 is abutted against the forming mold 122, and the sheet resin S is discharged. By being sandwiched, the outer peripheral portion of the formed sheet-shaped resin S is cut off, so that the burr on the outside of the molded product can be easily removed.

FIG. 8 is a view showing a shaping step of the sheet-shaped resin S. The sheet-shaped resin S is adsorbed on the inner surface of the cavity 122A of the molding die 122 and is along the inner surface (molding surface) of the mold cavity 122A. Shaped into shape. Further, the closed space forming mold 140 is abutted against the forming mold 122 to perform mold clamping, and the cooling air is shaped from the closed space forming mold 140 to form the sheet resin S forming mold. The surface opposite to the surface in contact with 122 is sprayed and cooled.

At this time, a plurality of fins 141 are arranged and formed on the surface of the closed space forming mold 140 facing the forming mold 122, and the closed space forming mold 140 is abutted against the forming mold 122. The closed space formed is divided into elongated spaces by these fins 141. Thereby, the cooling efficiency is improved and the cooling is made uniform.

FIG. 9 shows a surface of the closed space forming die 140 facing the molding die 122, and a plurality of (in this example) the opposite surface along the direction in which the sheet-shaped resin S hangs down. Of the fins 141 are arranged substantially in parallel. Thus, the closed space formed by abutting the closed space forming mold 140 against the molding die 122 is divided into four spaces as shown in FIG. In each of the divided spaces, an air supply port 142 for supplying air to a position above the closed space forming mold 140 in a direction in which the sheet-shaped resin S hangs is formed. An air outlet 143 serving as an air outlet is formed below the mold 140.

The fin 141 serves as a rectifying plate, and as shown in FIGS. 8 and 10, air supplied from an air supply port 142 provided above the closed space forming mold 140 is rectified. In this state, the air flows downward in the elongated space divided by the fins 141, and is discharged from an air outlet 143 formed below the closed space forming mold 140.

As described above, the fin 141 is provided on the closed space forming mold 140, and the closed space formed by abutting the closed space forming mold 140 against the forming mold 122 is divided into an elongated space, thereby providing air. And the sheet-like resin S is uniformly cooled. As a result, deformation of a molded product obtained by molding the sheet-shaped resin S is suppressed, and highly accurate vacuum molding is realized.

In the molding method of the present embodiment, in the elongated space divided by the fin 141, air flows from above to below. However, air may flow from below to above. . Further, in the elongated space divided by the fins 141, the direction of air flow may be alternately set to the opposite direction.

(Third embodiment)
In the present embodiment, the molding method of the second embodiment is applied to the molding method of the first embodiment. The difference from the first embodiment is that the intermediate mold is a mold for forming a closed space that forms a closed space with each of the divided molds, and fins are provided on the surface facing each divided mold.

FIGS. 11 and 12 are diagrams for explaining the molding method in the present embodiment. The same members as those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

As described above, the characteristic feature of the present embodiment is that the intermediate mold 23 is a closed space forming mold that forms a closed space with each of the divided

molds

21 and 22, and the opposing surface of each of the divided

molds

21 and 22. Is provided with the fins 51.

To explain this point in detail, in the first embodiment, the intermediate mold 23 is annular, but in the present embodiment, the intermediate mold 23 has a surface facing each of the

split molds

21 and 22. Is provided with a concave portion for forming a closed space. When the intermediate mold 23 is sandwiched between the divided

molds

21 and 22 and the mold is clamped, one surface of the intermediate mold 23 and the divided mold are separated. 21 forms a closed space, and the other surface of the intermediate mold 23 and the split mold 22 form a closed space.

A plurality of fins 51 are arranged on the surface of the intermediate mold 23 facing the split mold 21 and the surface of the intermediate mold 23 facing the split mold 22. The fact that a plurality of (three in this example) fins 51 are arranged substantially in parallel with each other along the direction in which the sheet-shaped resin S hangs on the surface facing each of the

split molds

21 and 22 is described above. This is the same as the second embodiment.

In each of the divided spaces, an air supply port 52 for supplying air is formed at an upper position in a direction in which the sheet-shaped resin S hangs, and an air discharge port 53 serving as an air outlet is formed at a lower position. It is formed in the same manner as in the second embodiment. However, in the case of the present embodiment, since air needs to be supplied from both sides of the intermediate mold 23, an air supply port 52 is formed at the center of the upper end surface of the intermediate mold 23, and each divided port is branched from the air supply port 52. An opening 52a is formed on a surface facing the

molds

21 and 22. Similarly, an air exhaust port 53 is formed at the center of the lower end surface of the intermediate mold 23, and an opening 53a is formed on the surface facing each of the

split molds

21 and 22 so as to branch therefrom.

In this manner, by forming the intermediate mold 23 as a mold for forming a closed space and forming the fins 51 on the surfaces facing the divided

molds

21 and 22, the molding of the sheet-like resins S1 and S2 is performed as shown in FIG. As shown in the figure, the air flows downward in the elongated space divided by the fins 51 in a state where the air is rectified, and the same effect as in the second embodiment can be obtained. As a result, it is possible to simultaneously achieve significant improvement in molding efficiency and high-precision vacuum molding.

(Fourth embodiment)
In the present embodiment, instead of providing the fins in the closed space forming mold or the intermediate mold, ribs are provided on the sheet-like resin, and the ribs are used as the fins to achieve efficient cooling.

However, when the rib is used as a current plate, it is necessary to form a high rib. However, if a high-profile rib is formed by molding a sheet-like resin in a molten state, there is a possibility that inconveniences such as falling down before curing may occur.

Therefore, in the present embodiment, as shown in FIG. 13, for example, when a protruding pin 203 is protruded from a molding die 201 for shaping the sheet-shaped resin S to form a rib, the opposing closed space forming A slit 202A is provided in the mold 202, and the tip of a rib formed by projecting the protrusion pin 203 is sandwiched and supported by the slit 202A so that the rib does not fall down even if the protrusion pin 203 is retracted. I have.

FIG. 14 shows a modified example. In this example, an insert part 204 is mounted on a mold 202 for forming a closed space, and the tip of a rib formed by protruding a protruding pin 203 is welded and supported. Like that. The insert component 204 is, for example, an injection molded product, a foam molded product, or the like.

In each case, high ribs can be formed, and these ribs can be used as rectifying plates instead of fins. The inside of the closed space is divided by the rib, and efficient cooling is realized. The provision of an air supply port and an air exhaust port in the closed space forming mold 202 in each of the spaces divided by the ribs is the same as in the second and third embodiments.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, in the first embodiment described above, the intermediate mold 23 is a hollow annular mold, but is not limited to this, and may be a non-hollow (so-called solid) mold.

1,101 Extruder 11,111 Hopper 12,112 Cylinder 13,113 Hydraulic motor 14,114 Accumulator 15,115 Hydraulic cylinder 16,116 T die 17,117 Extrusion slit 18,118

Roller

21,22

Split mold

21A,

22A Mold cavities

21B, 22B Vacuum suction holes 23 Intermediate dies 23C,

23D Projections

31, 32 Mold frames 31A, 32A Vacuum suction holes 41, 42 Molded

products

41a, 42a Cut-off portions b Burrs 51 Fins 122 Molding mold 140 Closed Space forming mold 141 Fin 142 Air supply port 143 Air discharge port 201 Molding mold 202 Closed space forming mold 202A Slit 204 Insert part

Claims

The first sheet-like resin and the second sheet-like resin in a molten state extruded from the extruder are drooped downward as they are and arranged between the split molds,
The first sheet-shaped resin is brought into close contact with the mold cavity of one of the divided molds by reducing the pressure of the air between one divided mold and the first sheet-shaped resin, and the other divided mold and the second sheet-shaped resin. By depressurizing the air between the resins, the second sheet-shaped resin is brought into close contact with the mold cavity of the other split mold,
A molding method characterized in that an intermediate mold is interposed between divided molds in which respective sheet-shaped resins are adhered, and the molds are clamped.
The molding method according to claim 1, wherein the intermediate mold has a protruding portion that is abutted along an outer peripheral edge of a mold cavity of each of the divided molds.
3. The molding method according to claim 1, wherein the shape of the intermediate mold is annular.
The mold formed on the outer peripheral portion of each split mold is brought into contact with each sheet-like resin in a state protruding from the abutting surface with the intermediate mold to form a sealed space, and each split mold and sheet The molding method according to any one of claims 1 to 3, wherein the pressure between the resin particles is reduced.
The molten sheet-like resin extruded from the extruder is hung downward, placed between the molding die and the closed space forming die, and the air between the molding die and the sheet-like resin is reduced in pressure. When the sheet-like resin is brought into close contact with the mold cavity of the molding die,
A plurality of fins are arranged substantially in parallel on the surface of the closed space forming mold facing the molding die, and in each area divided by these fins, cooling by air is performed from the closed space forming mold side. A molding method characterized by performing.
6. The molding method according to claim 5, wherein in each area divided by the fin, an air outlet is provided at one end of the mold for forming a closed space, and an air outlet is provided at multiple ends.
The first sheet-like resin and the second sheet-like resin in a molten state extruded from the extruder are drooped downward as they are and arranged between the split molds,
The first sheet-shaped resin is brought into close contact with the mold cavity of one of the divided molds by reducing the pressure of the air between one divided mold and the first sheet-shaped resin, and the other divided mold and the second sheet-shaped resin. By depressurizing the air between the resins, the second sheet-shaped resin is brought into close contact with the mold cavity of the other split mold,
An intermediate mold in which a plurality of fins are formed in a substantially parallel arrangement on the surface facing each divided mold is interposed between the divided molds in which each sheet-shaped resin is adhered, and after clamping, the air is blown from the intermediate mold side. A molding method characterized by performing cooling by a method.
8. The molding method according to claim 7, wherein in each of the areas divided by the fin, an air outlet is provided at one end of the intermediate mold and an air outlet is provided at multiple ends.