JP2007131007A - Manufacturing method and apparatus of multi-layer sheet molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remarkably improve manufacturing efficiency of a multi-layer sheet by automating a molding cycle, in which sheets extruded through respective monolayer T dies overlie one another and further compression molded. <P>SOLUTION: Molten resins are forced into respective T dies, ranging from 14a to 14c, of a multiplex T die 14 which is composed by assembling T dies to extrude monolayer sheets, in a number corresponding to that of the layers. monolayer sheets ranging from 16A to 16C, extruded through respective T dies from 14a to 14c, are superposed to overlie outside the multiplex T die as the resins remain molten or semi-molten to form an intermediate multi-layer sheet molded article 16. Further, the intermediate sheet molded article 16 is compression molded, and a multi-layer sheet molded article made into desired shape is obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for producing a multilayer sheet molded product, and more specifically, to efficiently produce multilayer sheet molded products of various shapes by laminating extruded single layer sheets and then compression molding them. The present invention relates to a manufacturing method and apparatus capable of performing the above.

  Manufacturing technology that combines injection molding and press molding methods, or combined extrusion molding and vacuum molding, to produce relatively wide and complex three-dimensional single-layer sheet molded products from thermoplastic resin materials. It is known.

  In order to manufacture this type of sheet molded product, after extruding the molten resin into a sheet form from an extrusion die or the like, the extrusion die or the like is directed to the mold of the compression molding machine in order to compress the molten resin. Must be moved. Conventionally, various apparatuses have been proposed in which an extrusion die or the like can be moved on a lower mold of an open mold along a pre-programmed trajectory (Japanese Patent Publication No. 59-17931, Japanese Patent Laid-Open Publication No. Sho-05). 63-137814).

  In addition, an example in which a sheet stamping molding method is applied is also known. In this sheet stamping molding method, a once molded sheet is cut into a predetermined size, softened by reheating before compression molding, and then supplied to a compression molding machine for final molding. This sheet stamping molding method includes the steps of extrusion of molten resin, cutting of the sheet, heating, and compression molding. However, power consumption increases due to reheating, and there are restrictions on the shape of the sheet that can be supplied to the compression molding machine.

  In these conventional techniques, since the opening shape of the extrusion die is constant, a sheet having a constant width is extruded. For this reason, it is not suitable for the manufacture of a sheet molded product whose width changes in a planar shape.

  As a prior art, there is an apparatus for supplying an extruded sheet into a shape corresponding to a final molded product and supplying it to a compression molding machine in order to obtain a sheet molded product having a change in width (Japanese Patent Publication No. 1-25689). ).

  In this apparatus, the cross-sectional shape of the sheet extruded from the supply port facing the mold can be changed in accordance with the shape of the final molded product.

  The above is a technique related to a single-layer sheet molded product, but there is a multilayer molded sheet molded product that molds a product in which sheets having different strength, hardness, color, or the like are laminated. For example, it is a sheet molded product composed of three layers such as a base material, an intermediate layer, and a skin material.

  Japanese Patent Publication No. 5-2491 and Japanese Patent Application Laid-Open No. 5-24128 disclose a method and apparatus for manufacturing this type of multilayer sheet molded product. In this prior art, a multilayer sheet is extruded after being laminated in a common T-die from discharge nozzles of a plurality of injection devices. This multilayer sheet is supplied to a mold of a compression molding machine in order to apply compression molding in the next step.

  However, conventionally, a single layer sheet is laminated inside a T die and then extruded. For this reason, it is difficult to control the temperature for each single-layer sheet, and in particular, in the case where the intermediate layer is added with a foaming agent, the unfoamed temperature until immediately before being subjected to compression molding under the heat of the surrounding molten resin or T-die. It was difficult to keep the state.

  In the cutting process of the sheet extruded from the T die, the cutting blade is moved at right angles to the width direction of the sheet at the T die extrusion port to perform cutting (Japanese Patent Publication No. 60-44124).

  In this sheet cutting, the molten resin adheres to the periphery of the extrusion opening of the T-die, and the resin burned by heat tends to adhere to the cut surface of the sheet, and the cutting blade is heated to a high temperature, resulting in poor sharpness. This is performed in a situation where the molten resin is also likely to adhere to the blade.

  Moreover, in the manufacturing process of the multilayer sheet molded product, in the sheet cutting process, when the viscosity of the molten resin is low and the adhesiveness is strong, cutting with a cutting blade becomes more difficult. To prevent the molten resin from adhering to the cutting blade waiting near the T die extrusion port, and to keep the cutting blade always clean, various cleaning means are attached to the cutting blade relatively frequently. It was necessary to clean.

  Such cleaning of the cutting blade delays the molding cycle and greatly reduces the manufacturing efficiency. Further, if the cleanliness of the cutting blade is insufficient, the quality of the molded product is deteriorated.

  Furthermore, in the production of a conventional multilayer sheet molded product, it is an object to improve the efficiency of the production process of a sheet having a complicated shape. In particular, when manufacturing a multilayer sheet molded product having various molding patterns with respect to the material, thickness, shape, etc. of the sheets of each layer, a series of steps of lamination, cutting and compression while simultaneously extruding the sheets of each layer from the T-die Is not realized only by the reciprocation of one stroke of the T die.

  Accordingly, an object of the present invention is to provide a sheet molded product manufacturing method capable of dramatically increasing manufacturing efficiency by automating a molding cycle in which sheets extruded from each single-layer T die are stacked and further compression molded. To provide an apparatus.

In order to achieve the above object, the manufacturing method according to the present invention is a method of manufacturing a multilayer sheet molded product in which sheets made of a resin are laminated, and T dies for extruding a single layer sheet are assembled by the number of layers. Preparing a compound T die, feeding molten resin to each T die of the compound T die, and extruding a single layer sheet of molten resin from each T die; and a single layer sheet extruded from each T die The resin is melted or semi-molten outside the compound T-die and stacked and stacked to form a multilayer sheet intermediate molded product, and the sheet intermediate molded product is compression molded to be shaped into a desired shape And a step of obtaining a multilayered sheet molded product.
Further, the production method according to the present invention is a method for producing a multilayer sheet molded product in which sheets made of a resin are laminated, and prepares a multiple T die in which T dies for extruding a single layer sheet are assembled for the number of layers, The molten resin is pumped to each T die of the compound T die, and a single layer sheet of the molten resin is extruded from each T die, and the single layer sheet extruded from each T die is disposed outside the compound T die. The resin is superposed and laminated in a molten or semi-molten state, and a multi-layer sheet intermediate molded product is formed, and the compound T die is inserted between molds arranged in the vertical direction, and the mold is inserted into the mold. A step of supplying a sheet intermediate molded product, a step of cutting the sheet intermediate molded product into a predetermined length, and a multilayer in which the sheet intermediate molded product is compression-molded with a mold and shaped into a desired shape Get sheet molded products And extent and is characterized in that it consists of.
Furthermore, the manufacturing method according to the present invention is a method for manufacturing a multilayer sheet molded product in which sheets made of a resin are laminated, and prepares a multiple T die in which T dies for extruding a single layer sheet are assembled for the number of layers, The molten resin is pumped to each T die of the compound T die, and the single layer sheet of the molten resin is extruded from each T die, and the single layer sheet extruded from each T die passes between a pair of nip rollers facing each other. And rotating the nip roller pair and sandwiching the single layer sheet between the nip roller pair, the single layer sheet is stacked on the outside of the compound T die while the resin is melted or semi-molten. , A step of forming a multi-layer sheet intermediate molded product, and a gold nip disposed in the vertical direction together with the duplex T-die while continuing the lamination by the nip roller pair. A step of interposing, a step of fixing the downstream end of the sheet intermediate molded product to the mold, a step of retracting the nip roller pair together with the compound T-die while continuing the lamination by the nip roller pair, The step of cutting the sheet intermediate molded product by stopping the rotation of the pair of nip rollers and the extrusion of the molten resin while continuing the retreat of the T die, and compressing the sheet intermediate molded product with a mold to obtain a desired shape And a step of obtaining a multilayer sheet molded product shaped into the above.

  Further, a manufacturing apparatus for carrying out the method according to the present invention is an apparatus for manufacturing a multilayer sheet molded product in which sheets made of resin are laminated, and melts a resin material for each layer, A plasticizing means for each layer to be pressurized and fed, a compound T die connected to each of the plasticizing means, and a T die for extruding a single layer sheet of molten resin, and the plasticizing means, Transfer means for moving the compound T die integrally with the molten or semi-molten single layer sheet disposed on the compound T die and extruded from each of the compound T dies. By means of laminating means for forming a multi-layer sheet intermediate molded product, means for cutting the sheet intermediate molded product arranged in the double T-die into a predetermined length, and the sheet for performing compression molding. Comprising a mold intermediate molded article is fed, the sheet intermediate molded article is characterized in that comprising a compression molding means for shaping into a desired shape.

As is clear from the above description, according to the present invention, the sheet extruded from each single-layer T die is laminated, and further, the molding cycle for compressing and molding is automated, and the production efficiency is dramatically improved. You can do it.
Further, according to the present invention, it is possible to efficiently manufacture even a multilayer sheet molded product having various shape patterns such that the width of the sheet is different for each layer.

  Furthermore, according to the present invention, since the sheet extruded from each single-layer T die can be cut quickly and smoothly and sent to the compression process, an improvement in manufacturing efficiency can be achieved.

Next, a method for producing a multilayer sheet molded product according to the present invention and a production apparatus for carrying out this method will be described in detail below with reference to the accompanying drawings.
1. Multi-layer sheet molded product manufacturing equipment
FIG. 1 thru | or FIG. 7 shows one Embodiment of the manufacturing apparatus of the multilayer sheet molded product based on this invention. In this embodiment, a multilayer sheet molded product consisting of three layers is molded. As the plasticizing means 10 that melts the resin material for each single-layer sheet and pressurizes and feeds the molten resin, three injection devices 10a, 10b, and 10c of an injection molding machine are arranged in parallel as shown in FIG. It is arranged. Connected to the discharge nozzles 12a, 12b, and 12c of the injection devices 10a, 10b, and 10c are T dies 14a, 14b, and 14c for extruding the molten resin pumped from the injection devices 10a, 10b, and 10c in the form of a single layer sheet. Has been. Each of the T dies 14a, 14b, and 14c is provided with a deckle as a widening amount adjusting means for adjusting the width of the extruded single layer sheet (see FIG. 9). The compound T die 14 is configured by arranging and arranging T dies 14a, 14b, and 14c. The single-layer sheet extruded from each of the T dies 14a, 14b, and 14c of the compound T die 14 is obtained by extruding a molten or semi-molten resin. Thereafter, each single-layer sheet is laminated in a molten or semi-molten state to form a multilayer intermediate sheet product. The multilayer sheet intermediate molded product cut into a predetermined length is supplied to a compression molding machine 18 as compression molding means. The compression molding machine 18 includes an upper mold 24a, a lower mold 24b, and a mold clamping mechanism for clamping the mold together with a mechanism for moving the upper mold 24a up and down to open and close both molds. After the multilayer sheet intermediate molded product is placed on the lower mold 24b, the upper mold 24a descends and compression molding is performed.

  In FIG. 1, the injection devices 10 a to 10 c are placed on a base 19 provided on a bed 17. The base 19 can be reciprocated by a base moving mechanism having a drive motor and a pinion rack mechanism (not shown) incorporated in the bed 17. As the base 19 moves, the duplex T-die 14 reciprocates and can enter between the open upper die 24a and the lower die 24b of the compression molding machine 18 from the standby position indicated by the solid line in FIG. The position of the T compound T die 14 indicated by the alternate long and short dash line in FIG. 1 is the position where the most advanced advancement starts to supply the multilayer sheet intermediate molded product to the lower mold 24b.

  Thus, the compound T die 14 is provided so as to be able to advance and retreat between the upper die 24a and the lower die 24b arranged in the vertical direction of the compression molding machine 18 by the transfer means 22 together with the injection devices 10a to 10c.

  As shown in FIG. 3, the single-layer sheets 16 </ b> A to 16 </ b> C extruded from the respective T dies 14 a, 14 b, and 14 c are overlapped in the vicinity of the extrusion port of the duplex T-die 14 to form a multilayer sheet intermediate molded product 16. Laminating means 26 for molding is provided integrally with the duplex T-die 14. In the present embodiment, the lamination means 26 is provided upstream of the cutting means 20 that cuts the multilayer sheet intermediate molded product 16 into a predetermined length. The laminating means 26 sandwiches the intermediate single-layer sheet 16C between the single-layer sheets 16A and 16B of both outer layers so that air is not caught between the single-layer sheets 16a to 16c. A pair of nip rollers 26a and 26b are provided. In this case, the nip rollers 26a and 26b are connected to the cylinders 27a and 27b. When the nip rollers 26a and 26b are driven and advanced by the cylinders 27a and 27b, the single-layer sheets 16A to 16C are nipped while rotating to overlap each other. The multilayer sheet is laminated on the intermediate molded product 16.

  In addition, such a lamination | stacking means 26 can respond also to the lamination | stacking operation | work from which the length of one of the single layer sheets 16A thru | or 16C differs, and has a predetermined intermittent pattern. In this case, the nip rollers 26a and 26b are moved forward and backward in accordance with the pattern, so that multilayer molded products having various shapes can be manufactured smoothly.

  Further, a cutting means 20 for cutting the multilayer intermediate sheet product 16 is provided below the extrusion port of the compound T die 14. The cutting means 20 is configured to move forward and backward together with the compound T die 14 by being integrally attached to the compound T die 14 together with the stacking means 26. In addition, as shown in FIG. 5, the cutting means 20 in the present embodiment is configured such that the laminated multilayer sheet intermediate molded product 16 is held from both sides and cut by a required cutting blade. There are various variations in the embodiment of the cutting means 20, which will be described later.

  Next, FIG. 5 is a schematic diagram showing the arrangement of limit switches for positioning the entire structure of the apparatus for manufacturing a multilayer sheet molded product and the position of the compound T die 14 and for controlling the operation of each part in sequence. FIG. 7 is a block diagram showing the configuration of the sequence automatic control system.

  In FIG. 5, LS is a limit switch having contacts 1 to 4 constituting a part of the transfer means 22. A contact operating member 30 that opens and closes each contact of the limit switch LS is attached to a base 19 on which the injection devices 10a to 10b are mounted. As the base 19 moves, each contact of the limit switch LS is turned on / off by the contact operating member 30 in accordance with the position of the compound T die 14. In this case, the contacts LS1 to LS4 correspond to the positions LS1 to LS4 in the lower mold 24b of the compression molding machine 18, respectively. The ON / OFF signals of the contacts of these limit switches LS are sent from the transfer means 22 to the sequencer 34 shown in FIG. Based on this signal, the sequencer 34 controls the operation of the forming means of the manufacturing apparatus according to the sequence control program.

  In this embodiment, when the base 19 moves forward and the contact actuating member 30 turns on the contact 1 of the limit switch LS, the extrusion port of the duplex T-die 14 seems to be directly above the position LS1 of the lower mold 24b. Is set to When the double T-die 14 is retracted from this position and the contacts 2, 3 and 4 are turned on, respectively, a position where the multilayer sheet intermediate molded product 16 extruded from the double T-die 14 is cut by the cutting means 20 Corresponds to the positions LS2, LS3, LS4. When the compound T die 14 is located at the position shown in FIG. 5, the contact 3 of the limit switch LS is on and the position LS4 on the lower die 24b is on. If 16 is cut, its cut end is positioned at LS4 on the lower die 24b.

  In FIG. 5, reference numeral 31 denotes an injection cylinder for advancing the screws 11a to 10c for pushing out the molten resin from the injection devices 10a to 10c.

  FIG. 7 shows a control system centering on a sequencer 34 for each forming means for manufacturing a multilayer sheet molded product. The molding pattern of each single-layer sheet of the multilayer sheet molded product can be set by the setting panel 35. The central processing unit 32 sequentially executes a sequence control program for instructing the operation order of each forming means according to the set forming pattern, and gives a command to the sequencer 34. Sequencer 34 performs sequence control of each forming means based on the command.

  The T dies 14a to 14c of the compound T die 14 are provided with widening amount adjusting means 42a to 42c for adjusting the widths of the extruded single-layer sheets 16A, 16B and 16C, and the sequencer 34 has a widening amount adjusting means 42a. To 42c. The details of the widening amount adjusting means 42a to 42c will be described later.

  In this embodiment, the compression molding means 18 includes a mold exchanging means 36 for exchanging the molds and a means 38 for heating or cooling the molds. The operation of the heating / cooling means 38 is controlled by the sequencer 34.

Hereinafter, based on FIG. 5, FIG. 6, FIG. 7, the operation | movement in the manufacturing process of a manufacturing apparatus is demonstrated in relation to the manufacturing method of a multilayer sheet molded product. Hereinafter, the multilayer sheet intermediate molded product 16 is described as a sheet intermediate molded product 16.
In FIG. 5, in each of the injection devices 10a to 10c of the plasticizing means 10, the screws 11a to 11c move forward, and the molten resin is pumped to the T dies 14a to 14c of the duplex T die 14 through the discharge nozzles 12a to 12c. The From the T dies 14a to 14c, the molten resin is extruded as single layer sheets 16A to 16C, respectively.

  As the base 19 advances, the duplex T-die 14 enters between the opened upper mold 24a and lower 24b while extruding the single-layer sheets 16A to 16C. During this time, the single-layer sheets 16A to 16C are sandwiched by the pair of nip rollers 26a and 26b outside the composite T-die 14 so that they are overlapped and stacked in a molten state. In this way, the sheet intermediate molded product 16 in which the single-layer sheets 16A to 16C are laminated is formed.

  When the compound T die 14 further enters between the upper die 24a and the lower die 24b, the contact 1 of the limit switch LS is turned on. At this time, the compound T die 14 is positioned just above the position LS1 of the lower mold 24b. Therefore, the leading end portion of the sheet intermediate molded product 16 hanging from the compound T die 14 is set at the position LS1 of the lower die 24b.

  The sequencer 34 commands the transfer means 22 to move backward, and the duplex T-die 14 starts moving backward. During the retreat of the compound T-die 14, the sheet intermediate molded product 16 continues to be pushed out and is gradually placed on the lower die 24b.

  When the duplex T-die 14 reaches a position immediately above the position LS3 in FIG. 5, the contact 4 of the limit switch LS is turned on. Upon receiving this ON signal, the sequencer 34 operates the cutting means 20. The cutting means 20 cuts the sheet intermediate molded product 16 with the cutter. By this cutting, the rear end portion of the sheet intermediate molded product 16 that has been cut is positioned exactly at the position LS4, and the sheet intermediate molded product 16 is cut into a predetermined size and the lower mold 24b is Can be placed on top.

  In this way, the sheet intermediate molded product 16 can be sequentially supplied onto the lower mold 24b while laminating the single layer sheets 16A to 16C extruded from the compound T die 14 while the compound T die 14 is advanced and retracted.

  Further, since the single-layer sheets 16A to 16C in a molten state are held and cut in layers, the cutting terminals can be fused. As a result, there are advantages in that the setting to the mold at the start of the next cycle is easy and simple and the yield is improved.

In the final compression molding step, the upper mold 24a is lowered and the sheet intermediate molded product 16 is compressed between the lower mold 24b. Through this compression step, a multilayer sheet molded product finally formed into a desired shape is manufactured.
Regarding the supply of the sheet intermediate molded product 16 to the upper mold 24a and the lower mold 24b, as shown in FIG. 4, the T dies 14a to 14b are combined so that the thickest or heaviest single-layer sheet 16B is on the lower side. It is preferable to arrange and supply. In this case, in order to form the thickest or heaviest single-layer sheet 16B, the injection device 10b as the plasticizing means and the single-layer T die 14b have the shortest length of the pressure feed line between them, and the discharge nozzle It is preferable to connect via the shortest distance via 12b (see FIG. 2). By comprising in this way, the pressure loss of the resin during pumping to the T-die 14b can be reduced, and space saving can be realized.
2. Molding pattern of multilayer sheet molding products
Next, various molding patterns of a multilayer sheet molded product that can be molded using the manufacturing apparatus will be described with reference to FIG.

Molding pattern 1
FIG. 8A shows a three-layer structure comprising a single-layer sheet 16A as a skin, a single-layer sheet 16B as a base material, and a single-layer sheet 16C as an intermediate layer, all of which have the same molding pattern. The sheet molded product 40a is shown. As the resin material, the same kind of thermoplastic resin material, for example, polyolefin resin is used.

Molding pattern 2
FIG. 8B shows a multilayer sheet molded product 40b in which each single-layer sheet 16A, 16B, 16C has a different molding pattern. In this case, the molding pattern differs for each width size for each of the single-layer sheets 16A, 16B, and 16C forming each layer. By controlling the widening amount adjusting means 42a to 42c of the single-layer T dies 14a, 14b, and 14c for extruding each layer according to each molding pattern, a multilayer sheet molded product 40b whose width varies for each layer can be easily manufactured. can do.

Molding pattern 3
A multilayer sheet molded product 40c shown in FIG. 8C has a two-layer structure. The multilayer molded product 40c has a molding pattern in which a skin is formed by single layer sheets 16A and 16C made of a two-tone color or a different material, and a substrate is formed by the single layer sheet 16B.

Molding pattern 4
A multilayer sheet molded product 40d shown in FIG. 8 (d) is a three-layer multilayer sheet molded product made up of single-layer sheets 16A, 16B, and 16C. It has a molding pattern with a two-layer structure consisting of 16B and 16C. In this case, the lamination of the single-layer sheets 16A, 16B, and 16C by the lamination means 26 is intermittently cut according to the length of the molten sheet 16A, and only the surface-layer molten sheet 16A is individually cut by the cutting means 20, Furthermore, by stopping the supply of the molten resin from the injection device 10a to the T die 14a that extrudes the single-layer sheet 16A, a multilayer sheet molded product 40d having a partially different number of layers can be easily manufactured.

Molding pattern 5
(E) of FIG. 8 shows the multilayer sheet molded product 40e which consists of three layers which uses the single layer sheet 16A used as an outer skin, the single layer sheet 16B used as a base material, and the single layer sheet 16C used as an intermediate layer as a foamed resin material. . In this case, the widths of the single-layer sheets 16A, 16B, and 16C change with the same molding pattern.

  When the sheet 16C of the intermediate layer is made of a foamed resin, a foaming agent is added to the resin material that is plasticized by the injection device 10c. The injection device 10c plasticizes the resin at a relatively low temperature at which foaming does not occur, and supplies the plastic to the T die 14c. On the other hand, the temperature of the molten resin of the single-layer sheet 16A serving as the skin and the single-layer sheet 16B serving as the base material is controlled to be 50 to 100 ° C. or higher than the temperature of the molten resin of the intermediate layer 16C.

  As can be seen from FIGS. 3 and 4, the duplex T-die 14 is not a combination of the T dies 14 a, 14 b, and 14 c, but a collection of independent T dies. There is no direct heat conduction from the T dies 14a, 14b to the T dies 14c disposed between the T dies 14a, 14b on both sides, and therefore the temperature of each T die 14a, 14b, 14c. Are easy to manage individually. In addition, since the molten resin extruded from each T die 14a, 14b, 14c is laminated outside the compound T die 14, the intermediate T die 14c is compared with the molten resin extruded from the T die 14a, 14b. The molten resin extruded from can be extruded without being foamed while keeping the temperature of the molten resin at a relatively low temperature. Thereafter, the sheet is supplied to the compression molding machine 18 as the intermediate sheet molded product 16 including the single-layer sheet 16 </ b> C of the intermediate layer that remains unfoamed.

  In FIG. 5, in the compression molding process, such an intermediate sheet molded product 16 is compressed by the upper mold 24a and the lower mold 24b. Next, the upper mold 24a and the lower mold 24b are taken out while being clamped by a mold attaching / detaching device (not shown), replaced by the mold replacing means 36, and the heating / cooling means 38 heats the mold to a predetermined temperature, The single layer sheet 16C of the intermediate layer is foamed.

  That is, since it takes time to foam, the mold exchanging means 36 preferably replaces the mold for foaming the intermediate sheet molded product 16 with a new mold. Thereby, in the mold 24A in the middle of foaming, the intermediate layer 16C can be sufficiently foamed. Then, after foaming, the mold 24A is cooled, and a multilayer sheet molded product 40e having a foamed resin as the intermediate layer 16C can be obtained. In this way, it is possible to produce a multilayer sheet molded product 40e with good moldability and excellent aesthetics by leaving it unfoamed at the stage of lamination and foaming during compression molding in a mold. it can.

  Further, by providing the mold exchanging means 36, the compression molding machine 18 can immediately shift to the next molding cycle, so that the production efficiency of the multilayer sheet molded product 40e having the foamed resin layer can be improved.

3. Automatic control of the width of a single-layer sheet by means of adjusting the amount of widening of the T-die
Next, automatic control of the widening amount adjusting means 42a to 42c for manufacturing a multilayer molded product having the various molding patterns described above will be described.

  FIG. 9 shows the widening amount adjusting means 42a provided in the T die 14a. The other T dies 14b and 14c are also provided with widening amount adjusting means having the same configuration.

  Reference numeral 50 denotes an extrusion port of the T die 14a. A pair of deckles 52a and 52b are attached to the extrusion port 50 so as to face each other so as to be movable in the width direction of the sheet. The deckles 52a and 52b can move in the direction of approaching or separating from each other at the same time, thereby changing the width of the extrusion port 50.

  The deckles 52a and 52b are driven using the servo motor 54 as a drive motor. In FIG. 9, the drive mechanism of the deckle 52a is not shown, but the same configuration is provided. A ball screw 58 is coupled to the drive shaft of the servo motor 54 via a coupling 56. On the other hand, a moving member 60 incorporating a ball nut is attached to the end of the deckle 52b. A ball nut (not shown) of the moving member 60 is screwed into the ball screw 58. When the ball screw 58 is rotated by being driven by the servo motor 54, the rotational power of the servo motor 54 is transmitted to the deckle 52b for linear movement along the extrusion port 50 using the linear guides 62a and 62b as guides.

Accordingly, by controlling the servo motor 54, the positions and speeds of the deckles 52a and 52b can be controlled. Then, while the molten resin is extruded from the extrusion port 50, the width of the extruded molten resin can be set to an arbitrary size by positioning the positions of the deckles 52a and 52b at predetermined positions. Further, while the molten resin is extruded from the extrusion port 50, the width of the molten resin can be continuously changed by controlling the positions of the deckles 52a and 52b continuously.
Such position and speed control of the deckles 52a and 52b includes the following control methods.

Open loop control method
FIG. 10 shows an embodiment of an open-loop control system for deckle position control in the case of manufacturing a multilayer sheet molded product having various molding patterns shown in FIG.

  That is, the positions of the injection device 10 (10a, 10b, 10c) and the duplex T-die 14 (14a, 14b, 14c) are detected by the contacts 1 to 4 of the limit switch LS as already described in FIG. The sequencer 34 controls the extrusion operation of the molten resin according to the position of the compound T die 14.

  Further, based on the molding pattern set by the setting panel 35, the CPU 32 calculates a command to be given to the sequencer 34. The sequencer 34 gives a position (speed) command to the servo motor 54, and performs open loop control of the positions (speeds) of the deckles 52a and 52b.

  Further, the sequencer 34 controls the moving speed of the screws 11a to 11c through the electromagnetic flow rate adjusting valve 39 with the flow rate of the pressure oil sent to the injection cylinder 33 that advances the screws 11a to 11c according to the molding pattern. Thereby, the discharge amount of molten resin can be controlled. In this case, the amount of change (change speed) in the molten sheet width by the position (speed) control of the deckles 52a and 52b and the amount of change (change speed) in the discharge amount of the molten resin are set to be the same. Only the width of the sheet can be changed while the thickness of the sheet extruded from the dies 14a to 14c is substantially uniform.

  In addition, instead of the injection apparatus 10 as the plasticizing means, when the continuous extrusion molding is performed by an extruder, the discharge amount of the molten resin can be changed by adjusting the rotation speed of the screw of the extruder.

Closed loop control method
FIG. 11 shows an embodiment of a closed loop control system for deckle position control in the case of manufacturing a multilayer sheet molded product having various molding patterns shown in FIG.

  In this case, the change amount of the sheet width is programmed or set in advance from the setting panel 35 according to the forming pattern, and the CPU 32 sends the position commands of the deckles 52a to 52c according to the forming pattern via the sequencer 34 to the servo motor 54. (54a, 54b, 54c) is given, and the deck position (speed) in the T die 14 is adjusted to change the sheet width of the molten resin.

  The positions and speeds of the deckles 52a to 52c are fed back to the sequencer 34 by an encoder 66 (40a, 40b, 40c) attached to the servo motor 36. Further, the screw position and speed of the injection device 10 are also fed back from the detector 68 to the sequencer 34. In this way, the positions (speeds) of the deckles 52a to 52c are compared with the command value, and the positions (speeds) of the deckles 52a to 52c are controlled so as to match the command value. The sequencer 34 compares the position (speed) of the screws 11a to 11c with the command value, and operates the flow rate of the pressure oil supplied to the injection cylinder 31 via the flow rate adjustment valve 39 so as to match the command value. As a result, the amount of molten resin discharged is similarly controlled.

  In addition, when it replaces with the injection apparatus 10 as a plasticizing means and performs continuous extrusion molding with an extruder, the rotation speed of the screw of an extruder is adjusted.

4). Example of sequence program for multilayer sheet molded products
Furthermore, FIG. 12 shows an example of a sequence program for forming a multilayer sheet molded product in the automatic production system.
For example, the deckels 52a to 52a, the injection devices 10a to 10c, and the cutting means 20 when a sequence program for manufacturing a multilayer molded product composed of the single-layer sheets 16A, 16B, and 16C shown in FIG. Examples of time charts of the operation of the stacking means 26 are shown in FIGS.

  For the single-layer sheet 16A having a short length, the position (speed) of the deckle 52a in one cycle, the plasticizing operation of the resin of the injection device 10a, the cutting operation by the cutting means 20, and the roll contact operation operation by the laminating means 26 are shown in FIG. Set as shown in 12 (b).

  For the single-layer sheets 16B and 16C, the operation of each part in one cycle is set to perform the same operation as shown in FIG.

  As shown in these time charts, since the single-layer sheet 16A is short, the operation sequence of the injection apparatus 10a and the deckle 52a is such that the extrusion of the single-layer sheet is finished before the other single-layer sheets 16B and 16C. Set. Further, while the single-layer sheet 16A is extruded, the single-layer sheets 16B and 16C are laminated, and the single-layer sheet 16A is first cut simultaneously with the end of extrusion. Thereafter, the extrusion of the single-layer sheets 16B and 16C continues. When the sheet is extruded by a predetermined length, it is cut simultaneously with the stop of the extrusion.

  Note that the single-layer sheets 16A, 16B, and 16C have a speed at which the deckles 52a to 52c narrow the width of the extrusion port so that the single-layer sheets 16A, 16B, and 16C are extruded with a constant thickness, and a resin flow rate that is pumped from the injection devices 10a to 10c. The decrease rate is set in the same way.

  On the other hand, FIG. 12D shows a case where the thickness is changed only for the single-layer sheet 16C. In this case, the discharge amount of the molten resin in the injection device 10c is changed. .

5. Various embodiments of the cutting means
Hereinafter, various embodiments of the cutting means used in the cutting step will be described.

Embodiment 1 of cutting means
FIG. 13 shows the configuration of the cutting means 100 of the multilayer intermediate sheet product 16, and FIG. 14 shows its operating state.

  The cutting means 100 in this embodiment is disposed downstream of the stacking means 26. The cutting means 100 includes a pad member made up of a pair of pads 110 and 110 that sandwich the sheet intermediate molded product 16 from both side surfaces thereof. Each of the pads 110 and 110 is formed in a circular curved surface on the contact surface side with the sheet intermediate molded product 16 to guide the sheet intermediate molded product 16 laminated while being extruded. Further, each pad 110 is divided into two parts in the vertical direction, and the divided pads 110a and 110b are arranged symmetrically and slightly apart in the vertical direction. A pair of left and right pads 110, 110 made up of these divided pads 110a, 110b are connected to driving means 112, 112 made up of actuators such as fluid pressure cylinders, respectively.

  The contact surface on the circular curved surface where each pad 110, 110 contacts the sheet intermediate molded product 16 is preferably coated with a non-adhesive coating layer for preventing adhesion of the molten resin of the sheet intermediate molded product 16. Apply processing. Further, passages 116 and 116 through which a coolant for cooling the portion where the sheet intermediate molded product 16 is in contact with the pads 110 and 110 flow are provided in the pads 110 and 110, and the passages 116 and 116 are provided. It constitutes a cooling means. Further, in order to make it easy to peel the sheet intermediate molded product 16 from the contact surfaces of the pads 110 and 110, the sheet intermediate molded product 16 includes an air blow passage 118 that ejects air from the inside of each pad 110 toward the sheet intermediate molded product 16. Air blowing means is provided. A gap 120 is formed between the divided pads 110a and 110b. In this case, the circularly curved contact surfaces of the divided pads 110a and 110b protrude most toward the sheet intermediate molded product 16 side, and the gap 120 is provided between the protruding portions.

  A cutter 122 is accommodated in the gap portion 120 of one of the divided pads 110a and 110b so as to protrude toward the sheet intermediate molded product 16. The cutter 122 is positioned so that the blade 122a at the tip thereof slightly protrudes from the surface of the pad 110. The other end of the cutter 122 is attached to a cutter moving means 124 for moving the cutter 122 in the width direction of the sheet intermediate molded product 16.

  FIG. 15 shows a cutter moving means 124 that moves the cutter 122 between the divided pads 110a and 110b. The cutter 112 is attached to an actuator 128 that slides along a guide bar 126 disposed in the width direction of the sheet intermediate molded product 16.

  The operation of the cutting means 100 configured as described above will be described. When the single-layer sheets 16A, 16B, and 16C are extruded from the T dies 14a to 14c of the compound T-die 14, respectively, the single-layer sheets 16A, 16B, and 16C are overlapped by being sandwiched between the nip roller pairs 26a and 26b of the stacking unit 26. Then, the laminated sheet intermediate product 16 is formed. The sheet intermediate molded product 16 passes between the pads 110 and 110 of the cutting means 100 while being laminated.

  When the driving means 112 of the cutting means 100 is actuated, as shown in FIG. 14, the sheet intermediate molded product 16 between the pads 110, 110 at a position about 30 to 100 mm away from the extrusion port of the dual T die 14. Hold on.

  Due to the cooling action of the refrigerant flowing through the passage 116 of the pad 110, the portion of the entire sheet intermediate molded product 16 that is in a molten or semi-molten state that is in contact with the pad 110 is cooled. As shown in FIG. 16, the hatched portion is the cooled portion. The cutter 122 is disposed so as to face the cooling portion. When the cooling portion of the sheet intermediate molded product 16 is in a semi-solidified state that can be easily cut, the cutter moving means 124 is operated. Accordingly, the cutter 122 that has been waiting at one side end of the sheet intermediate molded product 16 can cut the sheet intermediate molded product 16 while moving in the width direction of the sheet intermediate molded product 16.

  In this way, in the molten sheet intermediate molded product 16, only the portion to be cut is cooled to facilitate cutting into a semi-solidified state, and then cutting is performed. For this reason, the sheet intermediate molded product 16 can be cut quickly and smoothly without adhering the molten resin to the blade of the cutter 122. Moreover, the cutting terminal of each layer of the sheet intermediate molded product 16 can be fused, and the setting to the mold of the compression molding machine in the next cycle can be facilitated.

  The sheet intermediate molded product 16 is cut by the cutter 122 while being sandwiched between the pads 110 and 110. For this reason, it is possible to prevent air from being caught between the single-layer sheets 16A to 16C during the cutting process.

  After cutting, the driving means 112 moves the pads 110 and 110 backward. At this time, air blow is performed so that the sheet intermediate molded product 16 is easily peeled off from the surfaces of the pads 110 and 110. Air is vigorously ejected from the air blow passage 118 toward the sheet intermediate molded product 16. By performing this air blow simultaneously with the receding of the pad 110, it is possible to avoid a situation in which the sheet intermediate molded product 16 adheres to the pad 110 and sticks to the surface of the pad 110 due to the presence of the molten resin.

  In addition, about a pair of pad 110 which has the cooling function with which the cutting | disconnection means 100 is provided, a roll-shaped thing can also be used for each division pad 110a, 110b, respectively.

  FIG. 17 shows a form in which the cutting means 100 is used for cutting a single-layer sheet 102.

  In FIG. 17, the sheet 102 extruded from the single-layer T die 104 is cut.

  In this manner, the cutting of the single-layer sheet can be achieved easily and smoothly using the cutting means 106 having the same configuration as that of the embodiment of FIG.

Embodiment 2 of cutting means
18 and 19 show another embodiment of the cutting means. The cutting means 140 according to this embodiment is of a type in which the multilayer sheet intermediate molded product 16 is sandwiched and cut by a pair of pads 110 and 110, as in the cutting means 100 of FIG. Therefore, the same components as those of the cutting means 100 of FIG. 13 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this cutting means 140, in one pad 110, a thin metal plate 142 that functions as a cutter is accommodated in the gap 120 between the divided pads 110a and 110b. The metal thin plate 142 is a thin plate longer than the width of the sheet intermediate molded product 16. Further, the metal thin plate 142 is accommodated in the gap 120 so as to protrude from the surface of the pad 110 that comes into contact with the sheet intermediate molded product 16. In this embodiment, as shown in FIG. 20, both ends of the thin metal plate 142 are held by holders 144 and 144, respectively. These holders 144 and 144 are coupled to an actuator 146 such as a fluid pressure cylinder. The actuator 146 constitutes cutter operating means for causing the metal thin plate 142 to protrude from the gap portion 120 of the pads 110 and 110 with respect to the sheet intermediate molded product 16.

  In addition, as a cutter for cutting the sheet intermediate molded product 16, a metal wire made of a piano wire or the like can be used instead of the metal thin plate 142. Further, when cutting the sheet intermediate molded product 16, the metal thin plate 142 or the metal wire can be easily cut by heating with a heating means such as a heater built in an appropriate pad 110. . In this case, it is also effective to use, for example, a nichrome wire that generates heat when energized as the metal wire.

  The operation of the cutting means 140 configured as described above will be described. When the single-layer sheets 16A, 16B, and 16C are extruded from the T dies 14a to 14c of the compound T-die 14, respectively, the single-layer sheets 16A, 16B, and 16C are overlapped by being sandwiched between the nip roller pairs 26a and 26b of the stacking unit 26. Then, the laminated sheet intermediate product 16 is formed. The sheet intermediate molded product 16 passes between the pads 110 and 110 of the cutting means 140 while being laminated.

  And as FIG. 19 shows, the sheet | seat intermediate molded product 16 is clamped between the pads 110 and 110 in the position about 30-100 mm away from the extrusion port of the compound T die 14.

  Therefore, the actuator 146 of the cutter operating means is operated. As shown in FIG. 21, the sheet metal 142 that has been waiting while facing one side surface of the sheet intermediate molded product 16 presses the sheet intermediate molded product 16, causing the sheet intermediate molded product 16 to be sheared.

During this time, the sheet intermediate molded product 16 remains sandwiched between the pads 110 and 110, and air is prevented from being caught between the single-layer sheets 16A to 16C of the sheet intermediate molded product 16 during the cutting process. Can do.
Further, by heating the metal thin plate 142, the sheet intermediate molded product 16 can be cut more easily.

  After the cutting, the actuator 146 moves the thin metal plate 142 backward. The driving means 112 moves the pads 110 and 110 backward. At this time, air blow is performed so that the sheet intermediate molded product 16 is easily peeled off from the surfaces of the pads 110 and 110. Air is vigorously ejected from the air blow passage 118 toward the sheet intermediate molded product 16. By performing this air blow simultaneously with the receding of the pad 110, it is possible to avoid a situation in which the sheet intermediate molded product 16 adheres to the pad 110 and sticks to the surface of the pad 110 due to the presence of the molten resin.

In addition, about a pair of pad 110 which has the cooling function with which the cutting | disconnection means 140 is provided, the thing of a roll shape can also be used for each division pad 110a, 110b, respectively.
The cutting means 140 can also be used for cutting a single layer sheet.

Embodiment 3 of cutting means
Next, FIG. 22 shows cutting means according to the third embodiment.

  The cutting means 150 according to the third embodiment is different in arrangement position from the cutting means 100 of the first embodiment and the cutting means 140 of the second embodiment. The cutting means 150 of the present embodiment cuts before the single-layer sheets 16A, 16B, and 16C are laminated, with the mouths of the extrusion ports of the T dies 14a, 14b, and 14c of the duplex T-die 14 as cutting positions. Configured. The stacking means 26 is arranged at a position downstream of the cutting means 150.

  In this embodiment, a metal wire, preferably a piano wire, is used as the cutter. The piano wire 152 is provided so as to be in contact with or close to the opening surfaces 15a, 15b, and 15c of the respective T dies 10 through which the extrusion ports through which the single-layer sheets 16A, 16B, and 16C are extruded are opened. It is done. Four holders 156a, 156b, 156c, and 156d are provided as means for stretching the metal wire 152 so that the metal wire 152 comes into contact with the opening surfaces 15a, 15b, and 15c of the extrusion port of the duplex T die 14. Yes. The holders 156a, 156b, 156c, and 156d are used to stretch the metal wire 152 and intersect the single-layer sheets 16A, 16B, and 16C extruded from the T dies 14a, 14b, and 14c at right angles in the width direction. So that it is stretched.

  As shown in FIG. 23, the holders 156a, 156b, 156c, and 156d are supported by the gantry 154. In FIG. 23, the double T-die 14 is omitted and the T-die 14a is shown, and the illustration is simplified for convenience of explanation. The metal wire 152 is wound around a pair of reels 160 and 160 that are rotationally driven by a drive motor 158. One reel 160 is a reel that feeds the metal wire 152, and the other reel 160 is a reel that winds the fed metal wire 152. The metal wire 152 is fed between the reels 160 and 160 by a certain length for each cutting operation of the molding cycle. As a result, the portion of the metal wire 152 used for cutting is wound on the reel 160 in the next cycle, and a new portion of the metal wire 152 is stretched over.

  Next, means for causing the stretching means to travel in the sheet width direction while the metal wire 152 is stretched will be described.

  The gantry 154 and the reel 160 are attached to sliding means 164 that slides along guide bars 162 and 162 extending in the width direction of the single-layer sheets 16A to 16C. In this embodiment, a rodless cylinder is used for the slide means 164.

  In cutting the sheet intermediate molded product 16, the metal wire 152 is heated by an appropriate heating means, whereby the cutting can be performed more easily. Further, it is also effective to use a nichrome wire that generates heat when energized as the metal wire 152.

  The action of the cutting means 150 configured as described above will be described in relation to the cutting method. Single-layer sheets 16A to 16C are extruded from the T dies 14a to 14c of the compound T die, respectively. When the sliding means 164 waiting on one side end of the single-layer sheets 16A to 16C starts to slide along the guide bar 162, the metal wire 152 is connected to each T die 14a to 14c in the width direction of the single-layer sheets 16A to 16C. It moves while contacting along the opening of the extrusion opening. Therefore, the metal wire 152 can cut the single-layer sheets 16A to 16C all together at the extrusion port while moving. By thus cutting the single-layer sheets 16A to 16C along the extrusion opening surfaces of the T dies 14a to 14c, it is possible to prevent the sheet from remaining at the extrusion openings. When the cutting is completed, in preparation for the next molding cycle, the metal wire 152 is wound around the reel 160 at the portion where the single-layer sheets 16A to 16C are cut, and the new portion is stretched. Thereby, in the next cycle, the single-layer sheets 16A to 16C can be smoothly cut with the metal wire 152 to which the molten resin is not attached.

  The cut single-layer sheets 16A to 16C are sandwiched and stacked between the nip rollers 26a and 26b of the stacking means 26, and the sheet intermediate molded product 16 is supplied to the lower mold 24b of the compression molding machine 18. .

  Next, FIGS. 24 and 25 show an embodiment in which a thin metal plate 170 is used as a cutter instead of the metal wire 152. When the metal thin plate 170 is used, as shown in FIG. 24, the metal thin plate 170 is bent so as to be in contact with the opening surfaces 15a, 15b, 15c of the extrusion port of the dual T die 14. In FIG. 25, the double T-die 14 is omitted and the T-die 14a is shown, and the illustration of the metal thin plate 170 is simplified for convenience of explanation. However, the metal thin plate 170 is attached to the mount 154, and the sheet It can move in the width direction. 25, the same components as those in FIG. 23 are denoted by the same reference numerals, and detailed description thereof is omitted.

Embodiment 4 of cutting process and cutting means
FIG. 26 shows another embodiment of the cutting process of the multilayer sheet intermediate molded product 16. In the case of this embodiment, unlike the previous embodiments, in particular, the multilayer sheet intermediate molded product 16 is formed into a single-layer T die 14a by using a nip roller that also serves as a laminating means without providing a cutter for cutting. , 14b and 14c are cut from the mouths of the extrusion ports.

  Below the compound T die 14, single layer sheets 16A, 16B, and 16C extruded from the T dies 14a, 14b, and 14c of the compound T die 14 are laminated on the sheet intermediate molded product 16, and this sheet intermediate molded product. Take-off cutting means 182 is provided for cutting 16 by pulling 16 from the mouth of the extrusion port.

  Therefore, the cutting means 182 in the present embodiment is configured such that each single-layer sheet extruded from each single-layer T die 14a, 14b, 14c of the compound T die 14 as shown in FIGS. A pair of opposed nip rollers 182a and 182b for forming the layers 16A to 16C into multi-layers by removing the air entrainment are arranged close to the extrusion port. The nip rollers 182a and 182b are configured to move integrally with the compound T die 14 as in the above-described embodiments.

  Details of the cutting means 182 are shown in FIG. Support shafts 184a and 184b projecting from both ends of a pair of opposed nip rollers 182a and 182b are rotatably supported via bearings 186, respectively. Further, pulleys 188a and 188b are attached to the support shafts 184a and 184b. Pulleys 192a and 192b are attached to output shafts of drive motors 190a and 190b for rotationally driving the nip rollers 182a and 182b. The pulleys 192a and 192b are arranged to face the pulleys 188a and 188b attached to the support shafts 184a and 184b. Timing belts 194a and 194b are wound around these pulleys 188a and 192a, 188b and 192b, respectively. Further, an actuator 196 such as an air cylinder is connected to an appropriate position in order to make the nip rollers 182a and 182b facing each other approach and separate from the support shafts 184a and 184b.

  Next, the operation of the compound T die 14 and the nip rollers 182a and 182b in the stacking process and the cutting process will be described.

  First, as shown in FIG. 26 (a), the single-layer sheets 16A, 16B, and 16C are extruded from the T dies 14a, 14b, and 14c, respectively, while the composite T die 14 moves forward. When the leading ends of the single-layer sheets 16A, 16B, and 16C pass between the nip rollers 182a and 182b, this state is detected by a sensor (not shown). At this time, the actuator 196 advances the nip rollers 182a and 182b. Thereby, the single-layer sheets 16A, 16B, and 16C are press-contacted between the nip rollers 182a and 182b, and are laminated on the sheet intermediate molded product sheet 16.

  The compound T die 14 moves forward and reaches a forward position corresponding to the front end side of the molds 24a and 24b of the injection compressor 18 as shown in FIG. The drive motors 190a and 190b rotate the nip rollers 182a and 182b in predetermined directions indicated by arrows, respectively. Thereby, the sheet | seat intermediate molded product 16 can be laminated and formed, and the front-end | tip part can be located in the edge part of the lower side metal mold | die 24b. When this state is appropriately detected by a sensor (not shown), the pressing member 200 of the mold exchanging means 36 described above moves, and the leading end of the sheet intermediate molded product 16 is moved to one end of the lower mold 24b. Secure to.

  Next, as shown in FIG. 26 (b), the front end portion of the sheet intermediate molded product 16 is fixed to the end portion of the lower mold 24b, and at the same time, the duplex T die 14 moves backward together with the cutting means 182. To do. In this case, the rotational speed of the nip rollers 182a and 182b is set so as to correspond to the moving speed of the compound T-die 14, so that the lamination speed of the sheet intermediate molded product sheet 16 and the lower mold 24b of the sheet intermediate molded product 16 are increased. The supply speed can be synchronized.

  In this way, while the compound T die 14 reaches the rear ends of the upper die 24a and the lower die 24b, as shown in FIG. The extrusion of the sheet from each of the 14 T dies 14a to 14c is stopped. At the same time, the rotation of the sheet intermediate molded product 16 is stopped while the sheet intermediate molded product 16 is held between the nip rollers 182a and 182b. Next, the nip rollers 182a and 182b are rotated again at the rotational speed or the rotational speed suitable for cutting, so that the sheet intermediate molded product 16 is torn off at one time from the mouths of the extrusion ports of the respective T dies 14a to 14c. Can be cut. The cutting terminal can also be fused. Thereafter, the rotation of the nip rollers 182a and 182b is stopped, and the nip rollers 182a and 182b are moved in directions away from each other. The compound T die 14 and the like are retracted from the upper die 24a and the lower die 24b and stopped at the standby position. In the meantime, the compression molding machine 18 can compress the sheet intermediate molded product 16 to produce a multilayer sheet molded product.

  In the above-described embodiment, it is preferable that the surface of the nip rollers 182a and 182b is subjected to, for example, a non-adhesive coating process in order to prevent adhesion of the molten resin. Further, in order to keep the nip rollers 182a and 182b at an appropriate temperature while the sheet intermediate molded product 16 is sandwiched, it is preferable to provide temperature control means including a refrigerant passage (not shown) inside the nip rollers 182a and 182b. . Further, scrapers 202a and 202b are attached to the nip rollers 182a and 182b so that the intermediate sheet 16 can be easily peeled off from the surface thereof (see FIG. 26B), or air blow means or the like is provided. You may make it attach.

  In this way, the single-layer sheets 16A, 16B, and 16C extruded from the T dies 14a, 14b, and 14c of the compound T die 14 are sandwiched by the nip rollers 182a and 182b, so that they can be stacked on the sheet intermediate molded product 16. In addition, the sheet intermediate molded product 16 can be picked up by the nip rollers 182a and 182b, and can be cut from the mouth of the extrusion port of the double T-die 14, so that proper lamination can be performed without entraining air between the sheets. The sheet intermediate molded product 16 can be smoothly supplied to the mold for compression molding.

Embodiment 5 of cutting means
Next, FIG. 28 and FIG. 29 show cutting means according to the fifth embodiment.

  The cutting means 210 according to the fifth embodiment, like the cutting means 150 of the third embodiment described above, uses the mouth of the extrusion port of each T die 14a, 14b, 14c of the compound T die 14 as a cutting position. Each single-layer sheet 16A, 16B, 16C is configured to be cut before being laminated.

  In FIG. 28, 212 is a holder that holds the cutters 214a to 214c. The holder 212 is attached to the tip of the swing plate 216. The swing plate 216 is swingably attached to the bracket 220 via a fulcrum 218.

  As the swing plate 216 swings, the cutters 214a to 214c attached to the holder 212 come into contact with the mouths of the extrusion ports of the T dies 14a, 14b, and 14c of the compound T die 14, or a predetermined It can be separated by a short distance. The spring 222 always urges the swing plate 216 in a direction in which the cutters 214a to 214c come into contact with the mouths of the extrusion ports of the T dies 14a, 14b, and 14c by the elastic force.

  The means for running the cutter support means configured as described above is shown in FIG. In FIG. 29, the illustration is simplified and only the T die 14 a of the dual T die 14 is illustrated.

  The above-described cutter support means is attached via a bracket 220 to slide means 226 that slides along guide bars 224 and 224 extending in the width direction of the single-layer sheets 16A, 16B, and 16C. In this embodiment, a rodless cylinder is used for the slide means 226.

  Next, 228 is an eccentric guide bar. The eccentric guide bar 228 is disposed in parallel to the guide bar 224. Two eccentric cam grooves 230a and a backward cam groove 230b are formed along the length of the outer periphery of the eccentric guide bar 228. As shown in FIG. 28, the cam groove 230a engages with a guide pin 232 fixed to the swing plate.

  In FIG. 29, the slide means 226 is located at the standby position. When the slide means 226 moves forward to cut the single-layer sheet sheets 16A, 16B, and 16C, the guide pin 232 engages with the outward cam groove 230a. When the cutting is finished and the return movement is made to the standby position, the guide pin 232 engages with the cam groove 230b for the return path.

  Since the guide pin 232 is engaged with the outward cam groove 230a and the backward cam groove 230b, the eccentric guide bar 228 can be rotated 90 degrees by the reciprocating motion of the slide means 226. . Further, as shown in FIG. 28, the center of rotation of the eccentric guide bar 228 is eccentric by a predetermined eccentric amount ε so that the radius of the cam groove 230b for the return path is longer.

The operation of the cutting means 210 configured as described above will be described in relation to the cutting method.
Single-layer sheets 16A to 16C are extruded from the T dies 14a to 14c of the compound T die, respectively. The slide means 226 waiting on one side end of the single-layer sheets 16A to 16C starts to slide along the guide bar 224. At this time, the eccentric guide bar 228 is in the rotational position shown in FIG. While the sliding means 226 moves forward, the guide pin 232 engages with the forward cam groove 230a. Therefore, the cutters 214a to 214c attached to the tip of the swing plate 216 via the holder 212 are aligned with the T die opening surfaces 15a to 15c of the T dies 14a to 14c in the width direction of the single layer sheets 16A to 16C. Move while touching. Accordingly, the cutters 214a to 214c can cut the single layer sheets 16A to 16C all together at the T die opening surfaces 15a to 15c while moving. By thus cutting the single-layer sheets 16A to 16C along the extrusion opening surfaces of the T dies 14a to 14c, it is possible to prevent the sheet from remaining at the extrusion openings.

  As soon as the cutting is finished, the sliding means 226 stops running after traveling to the forward end. Further, since the guide pin 232 tries to switch from the cam groove 230A for the forward path to the cam groove 230b for the backward path, the eccentric guide bar 228 rotates 90 degrees counterclockwise.

  When switched to the cam groove 230b, the eccentric guide bar 228 is slightly rotated so as to float counterclockwise via the guide pin 232 because the center of rotation of the eccentric guide bar 228 is eccentric by a predetermined eccentric amount ε. As a result, the cutters 214a to 214c that have been in contact with the T die opening surfaces 15a to 15c of the T dies 14a to 14c are separated.

  Thus, when the slide means 226 starts to retract to the original standby position while the guide pin 232 is engaged with the return-direction cam groove 230b, the cutters 214a to 214c have the T-die opening surfaces 15a to 15c of the T-die 14a to 14c. Move away from the distance. Therefore, it is possible to prevent the residual molten resin inside from dripping from the T die opening surfaces 15a to 15c of the T dies 14a to 14c and sticking to the cutters 214a to 214c. In the next cycle, the single-layer sheets 16A to 16C can be smoothly cut by the cutters 214a to 214c in which the molten resin is not attached.

  The cut single-layer sheets 16A to 16C are sandwiched and stacked between the nip rollers 26a and 26b of the stacking means 26, and the sheet intermediate molded product 16 is supplied to the lower mold 24b of the compression molding machine 18. .

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and many design changes can be made without departing from the spirit of the present invention.

  For example, instead of an injection molding machine, as a plasticizing means for a molten resin material bonded to a compound T die, it is possible to use an apparatus configured to allow intermittent operation in the same manner as an injection molding machine by combining a plunger with an extruder. it can.

  In addition, the compound T die that moves forward and backward with respect to the mold of the compression molding means, the laminating means, and the cutting means are arranged on a fixed plate on which the lower mold is attached, for example, straddling the lower mold. Guide means configured to move integrally along the guide rail may be provided. As a result, the double T-die can be moved forward and backward stably and reliably in conjunction with the injection molding machine. Further, the molding operation can be stabilized even if the combination of the heavy duplex T die, the laminating means, and the cutting means is cantilevered on the discharge nozzle side of the injection molding machine.

1 is a schematic side view showing one embodiment of an apparatus for carrying out a method for producing a multilayer molded product according to the present invention. It is a schematic plan view of the manufacturing apparatus of FIG. It is a principal part expanded sectional view which shows the structure of the compound T die with which the said manufacturing apparatus is provided. It is a figure which shows a mode that the sheet | seat extruded from the said compound T die is supplied to the lower mold | type of a compression molding machine. It is a schematic sectional drawing which shows the principal part of the manufacturing apparatus by this invention. It is a figure which shows the state which supplied the sheet | seat cut | disconnected in FIG. 5 to the metal mold | die. It is a system block diagram of the sequence automatic control system of the manufacturing apparatus by this invention. The perspective view which shows the multilayer sheet molded product which has a respectively different shaping | molding pattern manufactured by this invention. It is a figure which shows the structure of a widening amount adjustment means. It is a control system diagram of the control device of the open loop system with which the manufacturing apparatus by this invention is equipped. FIG. 3 is a control system diagram of a closed loop control device provided in the manufacturing apparatus according to the present invention. It is a time chart which shows operation | movement of each part of the manufacturing apparatus of a multilayer sheet molded product. It is a schematic sectional drawing which shows 1st Embodiment of a sheet cutting means. It is a schematic sectional drawing which shows the state which the sheet cutting means by 1st Embodiment act | operated. It is a side view which shows the arrangement position of the sheet cutting means by 1st Embodiment. It is a figure explaining the cutting operation of a sheet with a cutter. It is explanatory drawing of the sheet cutting means applied to the cutting | disconnection of a single layer sheet. It is a schematic sectional drawing which shows the principal part of the sheet | seat cutting means by 2nd Embodiment. It is a schematic sectional drawing which shows the state which the sheet | seat cutting means by 2nd Embodiment act | operated. It is a top view which shows arrangement | positioning of the cutter of the sheet cutting device by 2nd Embodiment. It is a figure explaining the sheet | seat cutting operation of the cutter of the sheet cutting device by 2nd Embodiment. It is a perspective view which shows the sheet | seat cutting means by 3rd Embodiment. It is a schematic perspective view of the sheet cutting means of FIG. It is a figure which shows the modification of the sheet | seat cutting means of FIG. It is a schematic perspective view of the modification of the sheet | seat cutting means of FIG. It is process explanatory drawing which shows operation | movement of the cutting | disconnection means by 4th Embodiment. It is a top view which shows arrangement | positioning of the cutting | disconnection means by 4th Embodiment. It is explanatory drawing of the cutting | disconnection means by 5th Embodiment. It is a schematic perspective view of the cutting | disconnection means by 5th Embodiment.

Explanation of symbols

10 Injection device (plasticizing means)
14 Duplex T-die 14a-14c T-die 16 Multi-layer sheet intermediate molded product 16a-16c Single-layer sheet 18 Compression molding machine (compression molding means)
20 Cutting means 22 Transfer means 24a Upper mold 24b Lower mold 26 Laminating means 52a 52b Dickel 54 Servo motor

Claims (4)

A method for producing a multilayer sheet molded product in which sheets of resin are laminated,
Prepare multiple T dies in which T dies that extrude a single layer sheet are gathered by the number of layers, feed molten resin to each of the T dies of the dual T die, and extrude a single layer sheet of molten resin from each T die Process,
A step of forming a multi-layer sheet intermediate molded product by laminating and laminating the single layer sheet extruded from each of the T dies while the resin is melted or semi-molten outside the compound T die; and
Compression molding the sheet intermediate molded product to obtain a multilayer sheet molded product shaped into a desired shape;
A method for producing a multilayer sheet molded product, comprising: A method for producing a multilayer sheet molded product in which sheets of resin are laminated,
Prepare multiple T dies in which T dies that extrude a single layer sheet are gathered by the number of layers, feed molten resin to each of the T dies of the dual T die, and extrude a single layer sheet of molten resin from each T die Process,
A step of forming a multi-layer sheet intermediate molded product by laminating and laminating the single layer sheet extruded from each of the T dies while the resin is melted or semi-molten outside the compound T die; and
A step of allowing the compound T-die to enter between molds arranged in a vertical direction, and supplying the sheet intermediate molded product to the mold;
Cutting the sheet intermediate molded product into a predetermined length;
A step of compression-molding the sheet intermediate molded product with a mold to obtain a multilayer sheet molded product shaped into a desired shape;
A method for producing a multilayer sheet molded product, comprising: A method for producing a multilayer sheet molded product in which sheets of resin are laminated,
Preparing a double T die in which T dies for extruding a single layer sheet are gathered for the number of layers, feeding a molten resin to each T die of the double T die, and extruding a single layer sheet of molten resin from each T die When,
Passing the single layer sheet extruded from each of the T dies between a pair of opposing nip rollers;
By rotating the nip roller pair and sandwiching the single layer sheet between the nip roller pair, the single layer sheet is stacked and laminated outside the compound T die while the resin is melted or semi-molten. A step of forming an intermediate molded product;
A step of allowing the nip roller pair to enter between the molds arranged in the vertical direction together with the duplex T-die while continuing the lamination by the nip roller pair;
Fixing the downstream end of the intermediate sheet product to the mold;
Retreating the nip roller pair together with the duplex T-die while continuing the lamination by the nip roller pair;
Cutting the sheet intermediate molded product by stopping the rotation of the nip roller pair and the extrusion of the molten resin while continuing to retract the compound T-die;
Compressing the sheet intermediate molded product with a mold to obtain a multilayer sheet molded product shaped into a desired shape;
A method for producing a multilayer sheet molded product, comprising: An apparatus for producing a multilayer sheet molded product in which sheets of resin are laminated,
Plasticizing means for each layer that melts the resin material for each layer, pressurizes and feeds the molten resin,
A compound T die connected to each of the plasticizing means and formed by a collection of T dies for extruding a single layer sheet of molten resin;
Transfer means for integrally moving the plasticizing means and the duplex T-die;
A stacking means for forming a multi-layer sheet intermediate molded product by superimposing a molten or semi-molten single layer sheet disposed on the compound T die and extruded from each T die of the compound T die;
Means for cutting the sheet intermediate molded product into a predetermined length disposed on the compound T die;
A compression molding means comprising a mold to which the sheet intermediate molded product is supplied in order to perform compression molding, and shaping the sheet intermediate molded product into a desired shape;
An apparatus for producing a multilayer sheet molded product, comprising:

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