JP4686208B2 - Manufacturing apparatus and manufacturing method for thermoplastic resin sheet having multilayer structure - Google Patents

Description

  The present invention relates to a colored band obtained by laminating a multilayer resin sheet and a thermoplastic resin sheet having a colored portion in the width direction in which a colored band made of a colored thermoplastic resin is embedded using an extrusion mold. The present invention relates to a manufacturing apparatus and a manufacturing method for a thermoplastic resin sheet having a multilayer structure in which is embedded in the width direction.

  Windshield glass used for automobiles, airplanes, etc., laminated glass bodies used for building windows, etc. are interlayer films made of polyvinyl butyral resin plasticized between two opposing glass plates Is sandwiched between. Such a laminated glass body has a high strength, and even if it is broken, no fragments are scattered around.

In order to produce an intermediate film used in such a laminate, generally, polyvinyl butyral resin that is heated and melted while being kneaded in a cylinder is fed to an extrusion mold and extruded from the extrusion mold. A method for obtaining a thin-film intermediate film is known.
The interlayer film thus obtained is colorless and transparent, and transmits most of the light. Therefore, in order to limit the transmission of the light, an attempt is made to provide a band-like colored portion in a part in the width direction of the interlayer. . For example, in a thermoplastic resin sheet used for a windshield of an automobile, a colored portion having a concentration gradient is provided in the upper region of the sheet, thereby reducing the sun rays that illuminate the driver through the windshield.

As a method for obtaining a sheet having such a colored band, for example, Patent Document 1 describes a method using a T die.
Here, a method of manufacturing a sheet in which a colored band having a predetermined width is enclosed in a thermoplastic resin is disclosed. In this method, the thermoplastic resin main stream enters the manifold and is extruded from the slit die extrusion mold through the extrusion passage, and the colored thermoplastic resin is extruded from the probe orifice and sealed in the main stream. It is.
That is, a manifold to which a thermoplastic resin is supplied, a probe that is disposed in the manifold and feeds the colored thermoplastic resin into the manifold, a slit-shaped die orifice as an extruded sheet outlet, a manifold, A thermoplastic resin sheet having a three-layer structure in which a colored thermoplastic resin is embedded in a thermoplastic resin using an extrusion mold having a land portion provided between the slit-shaped die orifice In the state where the thermoplastic resin mainstream enters the manifold, and the thermoplastic resin is extruded from the die for slit die extrusion through the land portion, the colored thermoplastic extruded from the orifice provided in the probe The resin is contained in the mainstream resin.
However, this method has the following problems.

Since the colored resin is extruded in parallel with the flow direction of the mainstream resin, the boundary between the colored strip embedded in the mainstream resin and the mainstream resin is clear. That is, the edge of the colored band appears clearly. Although the wedge shape can be used to make the boundary between the colored band and the mainstream resin slightly obscure, there is a limit.
Since the probe is arranged only on one side of the manifold, the flow of the thermoplastic resin sent from the manifold through the land to the slit-shaped die orifice becomes non-uniform, and the extruding flow rate of the resin becomes non-uniform. The thickness in the width direction tends to be uneven.
Since the probe is fixed to the main body of the mold only on one side, the position of the probe may change in the manifold, and the shape of the colored band and the thickness of the sheet become unstable.
There was such a problem when the T-die method was adopted.

  On the other hand, as a method for obtaining a sheet having a colored band, for example, Patent Document 2 describes a method using an L die. In this method, when the thermoplastic resin enters the manifold from the side surface of the mold and is extruded from the slit die extrusion mold, the flow direction of the mainstream resin of the thermoplastic resin in the L die changes direction. The edge of the colored band formed by the colored thermoplastic resin injected into the main flow of resin from the orifice of the probe using the flow of the resin flowing in the width direction is thinly spread in the main flow resin and embedded in the main flow of resin. A method for obtaining a thermoplastic resin sheet in which the edge of the colored band is obscured is described. Also, this method can make the resin flow in the manifold uniform compared to the method using a T-die, and the position of the opening through which the colored thermoplastic resin is extruded into the manifold does not change. The shape and sheet thickness can also be stabilized.

However, these methods are all methods for producing a one-layer thermoplastic resin sheet.
The thermoplastic resin sheet in which the colored band is embedded is not only used per se, but recently it is desired to use it as a multilayer resin sheet laminated with other thermoplastic resin sheets having various functions.
As a method of forming a multilayer sheet, it is also possible to obtain a desired multilayer thermoplastic resin sheet by laminating by a hot press using a pressure roll. However, with such a method, a single sheet can be obtained, but bubbles tend to remain on the laminated surface, and there is a limit to the adhesive strength of the adhesive surface.

Japanese Examined Patent Publication No. 1-343606 JP-A-4-94142

Therefore, a method of directly producing a multilayer resin sheet by co-extruding another thermoplastic resin sheet together with the thermoplastic resin sheet in which the colored band is embedded using a T die was considered. However, when the T-die is used, the obtained colored band becomes a vivid band, and thus a thermoplastic resin sheet in which the edge of the colored band is unclear cannot be obtained.
In order to obtain a thermoplastic resin sheet in which the edge of the colored band is unclear, it is necessary to use an L die, but unlike the case of the T die, a multilayer resin sheet is manufactured in the mold structure of the L die. I can't.

  Accordingly, an object of the present invention is to provide a manufacturing apparatus and a manufacturing method for manufacturing a thermoplastic resin sheet having a multilayer structure in which a thermoplastic resin sheet in which the edge of a colored band is unclear and another thermoplastic resin sheet are laminated. It is to be.

    The thermoplastic resin sheet manufacturing apparatus of the present invention includes, as a first aspect, a first resin layer made of a first thermoplastic resin and a first resin layer formed of the first thermoplastic resin. An extrusion path (1) for producing a thermoplastic resin sheet in which colored bands made of colored thermoplastic resin are embedded in the width direction is incorporated in one of the molds, and the extrusion path (1) is a probe. And side plates are provided on both sides of the manifold in the width direction, a first resin supply path for supplying the first thermoplastic resin into the manifold, and the first thermoplastic resin to the outside from the manifold. A land portion is provided at the outlet to be extruded, the probe is disposed in the manifold, and both ends thereof are supported by the both side plates, respectively, and the probe is colored thermoplastic in the manifold. Provide resin And the opening of the colored resin supply path is provided at a position where the first thermoplastic resin has a flow in the width direction in the manifold, and the width of the first thermoplastic resin. The thermoplastic resin sheet extrusion path (1) in which the opening of the first resin supply path and the opening of the colored resin supply path are arranged in this order toward the flow direction, and the thermoplastic resin. An extrusion path (2) for producing a multilayer resin sheet is incorporated in the other side of the mold, and a combined flow path is formed in which a plurality of thermoplastic resin supply flow paths are assembled into one flow path. A multilayer resin sheet extrusion path (2) having a feed block and a land portion through which the thermoplastic resin multilayered through the feed block is extruded outward from the manifold, the extrusion path (1) and the extrusion path (2) join Colored band characterized in that it is discharged from the mold outlet is apparatus for producing a thermoplastic resin sheet having a multilayer structure that is embedded in the width direction, the objects can be achieved.

Moreover, the manufacturing apparatus of the thermoplastic resin sheet of this invention, More preferably, in the 1st resin layer formed with the 1st resin layer which consists of a 1st thermoplastic resin, and this 1st thermoplastic resin An extrusion path (1) for producing a thermoplastic resin sheet in which a colored band made of a colored thermoplastic resin is embedded in the width direction;
The extrusion path (1) includes a die plate, a manifold, a first resin supply path for supplying a first thermoplastic resin into the manifold, and the first thermoplastic resin is pushed out from the manifold. A land portion is provided at the outlet, and the die plate is fixed to a wall surface on the back side of the manifold, and the die plate has a nozzle portion for supplying colored thermoplastic resin into the manifold. The opening of the portion is provided at a position where the first thermoplastic resin has a flow in the width direction in the manifold, and the first resin is supplied toward the flow direction in the width direction of the first thermoplastic resin. This is an apparatus for manufacturing a thermoplastic resin sheet in which the opening of the passage and the opening of the colored resin supply passage are arranged in this order, and thereby the above-described object is achieved.

Moreover, the manufacturing apparatus of the thermoplastic resin sheet of this invention is the 1st resin layer which consists of a 1st resin layer which consists of a 1st thermoplastic resin as a 2nd aspect, and the 1st resin layer formed with this 1st thermoplastic resin. An extrusion path (1) for producing a thermoplastic resin sheet in which a colored band made of a thermoplastic resin colored inside is embedded in the width direction is incorporated in one of the molds, and the extrusion path (1) is , A probe, and side plates are provided on both sides in the width direction of the manifold, a first resin supply path for supplying the first thermoplastic resin into the manifold, and the first thermoplastic resin from the manifold A land portion is provided at an outlet to be pushed outward, the probe is disposed in the manifold, and both end portions thereof are supported by the both side plates, respectively, and the probe has colored heat in the manifold. Plastic resin A colored resin supply path is provided, and the opening of the colored resin supply path is provided at a position in the middle of the flow of the first thermoplastic resin in the manifold in the outlet direction, and the first thermoplastic resin The extrusion path (1) of the thermoplastic resin sheet in which the opening of the colored resin supply path is arranged at the edge in the width direction of the flow, and the extrusion path (2) for producing a multilayer resin sheet made of thermoplastic resin It is incorporated in the other side of the mold, and the extrusion path has a feed block in which a plurality of thermoplastic resin supply paths are gathered into one, and a multi-layered heat block is formed through the feed block. It has a multi-layer resin sheet extrusion path (2) having a land portion where the plastic resin is pushed out from the manifold, and the extrusion path (1) and the extrusion path (2) are merged and discharged from the mold outlet. Characterized by It has a multilayer structure in which the color band is embedded in the width direction, which object of the present invention are achieved by.
Furthermore, the manufacturing method of the thermoplastic resin sheet of the present invention uses the thermoplastic resin sheet manufacturing apparatus according to claim 1 or 2, and uses the first resin layer made of the first thermoplastic resin, A thermoplastic resin sheet in which a colored band made of a colored thermoplastic resin is embedded in a width direction in a first resin layer formed of a first thermoplastic resin is formed on one side of a mold, and a multilayer A thermoplastic resin sheet having a multilayer structure in which a colored band is embedded in the width direction, wherein a resin sheet is formed on the other side of the mold and joined in an extrusion path before being discharged from the mold outlet This is a manufacturing method, whereby the above object is achieved.

(Function)
In the apparatus of the first aspect, since the opening of the colored resin supply path is provided at a position where the first thermoplastic resin has a flow in the width direction in the manifold, the flow direction of the colored thermoplastic resin The flow direction of the first thermoplastic resin is different. The outer portion of the colored thermoplastic resin in contact with the first thermoplastic resin is greatly affected by the flow of the first thermoplastic resin, and the central portion of the colored thermoplastic resin is less affected by the flow of the first thermoplastic resin. Therefore, although the central portion of the colored thermoplastic resin flows from the opening in the direction of substantially extruding the colored thermoplastic resin, the outer colored thermoplastic resin is in the direction of extruding from the orifice of the colored thermoplastic resin and the first thermoplastic resin. It will flow to the synthesized method with the flow direction of the resin.
Further, since the transparent resin exists in the combined direction of the flow directions of the two resins, the colored resin is diluted with the transparent resin. As a result, the width of the colored thermoplastic resin (hereinafter referred to as the colored band) becomes longer, and the thickness of the colored band gradually decreases as it moves toward the moving direction. The thickness becomes very thin, resulting in a gradation portion in which a dark colored portion and a thin colored portion are sequentially formed.

In the apparatus of the present invention, the opening of the colored resin supply path provided in the probe is pushed out from the opening of the probe by providing the first thermoplastic resin at a position where the first thermoplastic resin has a flow in the width direction in the manifold. As described above, the colored thermoplastic resin is affected by the flow in the width direction of the first thermoplastic resin, and a sheet having the above-described gradation portion is manufactured.
In addition, since the probe is disposed over the entire width of the manifold, the flow of the thermoplastic resin supplied into the manifold does not disturb the entire width of the manifold. Furthermore, since both ends of the probe are supported by the both side plates of the manifold, the position of the opening of the probe does not vary within the manifold.

  In another apparatus of the present invention, the opening of the colored resin supply path provided in the die plate is provided at a position where the first thermoplastic resin has a flow in the width direction in the manifold, As described above, the colored thermoplastic resin extruded from the opening is affected by the flow in the width direction of the first thermoplastic resin, and the sheet having the above-described gradation portion is manufactured.

Further, since the die plate is disposed over the entire width of the manifold, the thermoplastic resin supplied into the manifold does not disturb the flow in the entire width portion of the manifold. Furthermore, since the die plate is fixed to the wall surface on the back side of the manifold, the position of the die plate opening does not fluctuate within the manifold.
Regarding the extrusion path (1), in the apparatus of the second aspect, the thermoplastic resin supplied to the manifold is fed from the probe disposed in the manifold to the edge in the width direction in the manifold. The thermoplastic resin colored in the thermoplastic resin from the slit exit of the land on the outside of the manifold is enclosed at the edge of one end in the sheet width direction.

On the other hand, with respect to the extrusion path (2), the thermoplastic resin supplied to the feed block and flowing through a plurality of supply flow paths can be separated into two flow paths along the way, or the flow of other resins can be reduced. A supply path may be arranged in a desired order by providing a flow path for inserting the path in the middle. The supply channels at a plurality of locations are gathered into one combined channel before reaching the feed block outlet, and the thermoplastic resin flowing through each supply channel is multilayered in the combined channel. When the multilayered resin passes from the manifold to the land portion, a multilayer resin sheet is obtained.
Further, when the sheets formed in the respective extrusion paths are joined, the sheets are integrated to form a multilayered thermoplastic resin sheet.

  All of these series of multilayering processes are carried out in a closed mold, and a resin in a state where fluidity is maintained at high temperature can be directly brought into contact, so that the multilayered thermoplastic resin sheet is placed on the laminated surface. It does not contain bubbles and has strong adhesion on the laminated surface.

  According to the method of the present invention, a thermoplastic resin sheet having a multilayer structure including a thermoplastic resin sheet having a colored band as described above can be obtained. In particular, since the colored band is formed by actively utilizing the flow in the width direction of the first thermoplastic resin in the manifold, the dark colored portion where the coloring is dark and uniform is adjacent to the dark colored portion. In this way, it is possible to continuously produce a thermoplastic resin sheet that can be used particularly suitably as a colored band for an automobile windshield, by forming a colored band consisting of gradation portions that gradually become lighter in the sheet width direction. A thermoplastic resin sheet having a multilayer structure can be produced while maintaining the capability. Further, according to the apparatus of the present invention, a thermoplastic resin sheet can be obtained in which the resin flow in the manifold is uniform and the shape of the colored band and the thickness of the sheet are stable. Therefore, even if sheets with colored bands are laminated in a multilayer resin sheet mold, the flow of resin is not uneven, and a sheet having a stable thickness can be discharged from the mold outlet.

Example 1
FIG. 1 and FIG. 2 show a mold structure on the extrusion path (1) side for producing a thermoplastic resin sheet in which a colored band is embedded. Although the structure is originally a part of the mold, for convenience of explanation, in FIG. 1 and FIG. 2, a part of the structure of the mold is shown as an integral extrusion mold 1 for convenience.

  The extrusion path (1) has an extrusion mold 1 and a probe 2. The mold 1 supplies a melted first thermoplastic resin a into the manifold 3 in which the probe 2 is disposed, side plates 15 and 16 provided in the width direction of the manifold 3, and the manifold 3. A first resin supply passage 4, a slit 6 as an exit of the extruded sheet, and a land portion 7 as a resin passage through which resin is sent from the manifold 3 to the slit 6.

  The manifold 3 has a substantially circular cross section and is provided over almost the entire width of the extrusion mold 1. A first resin inlet 41 is provided at one end of the manifold 3, and the first thermoplastic resin a passes through the first resin supply path 4 and the resin inlet 41 from a resin extruder (not shown). 3 is supplied. When the resin a supplied into the manifold 3 is filled in the manifold 3, the resin a moves in the axial direction of the manifold 3, that is, in the width direction of the extrusion mold 1, and is pushed out from the land portion 7 to the slit 6. A thermoplastic resin sheet having approximately the same dimensions as the width of the manifold 3 is extruded.

The probe 2 disposed in the manifold 3 is formed in a substantially cylindrical shape. The probe 2 is arranged in the manifold 3 over the entire width thereof and substantially concentrically with the manifold 3 or slightly eccentric to the land 7. Both ends of the probe 2 are respectively supported by the both side plates 15 and 16, and a gap 17 is formed between the outer surface of the probe 2 and the inner wall surface of the manifold 3 over the entire circumference.
One side of the probe 2 (the resin inlet 41 side) is hollow, and a colored resin supply path 5 is formed therein.

The colored resin supply path 5 is opened in the manifold 3, and an orifice 8 is formed in the opening. The colored resin supply path 5 is connected to a colored thermoplastic resin extrusion apparatus (not shown), and the colored thermoplastic resin extruded from the extrusion apparatus flows into the manifold 3 from the colored resin supply path 5 through the orifice 8. To do.
The shape of the orifice 8 portion is shown in FIG. The orifice 8 includes a substantially rectangular first opening 81 that is long in the lateral direction, and a substantially triangular second opening 82 that is continuous with the first opening 81 and has a vertically narrowing width. The orifice 8 is provided so as to face the land portion 7 side. The vertical distance of the orifice 8 is set smaller than the vertical distance of the slit 6.
The first opening 81 of the orifice 8 is located on the first resin supply path 4 side, and the second opening 82 is located on the opposite side. The length of the orifice 8 is preferably not more than half the length of the slit 6, and more preferably 1/10 to 1/3.

Next, a method for producing a thermoplastic resin sheet using the above-described extrusion path (1) will be described.
A transparent thermoplastic resin (hereinafter referred to as transparent resin) a is supplied into the manifold 3 through the first resin supply path 4 and the inlet 41 toward the extrusion path (1). The transparent resin a is sequentially filled in the manifold 3 from the inlet 41 side, and is pushed out from the slit 6 through the land portion 7. In a stable state in which the transparent resin a is supplied into the manifold 3 and pushed out from the slit 6, the flow vector (the flow direction and flow velocity of the resin) of the transparent resin a varies depending on the position in the manifold 3. Yes.

  As shown in FIG. 4, the direction of the vector A of the flow of the transparent resin a is a combination of the width direction of the manifold 3 and the sheet pushing direction. The reason why the transparent resin a causes the flow in the width direction in the manifold 3 is that the inlet 41 of the transparent resin a is provided on a part of the wall surface of the manifold 3 (the left end portion in FIG. 1). To do. Usually, on the back side of the manifold 3, the vector A of the resin flow in the width direction of the manifold 3 is relatively large, and the vector A of the resin flow in the sheet pushing direction is small. On the slit 6 side of the manifold 3, the resin flow vector A in the width direction of the manifold 3 is small, and the resin flow vector A in the sheet pushing direction is large. In the land portion 7, there is almost no resin flow in the width direction of the manifold 3, and there is only a resin flow in the sheet pushing direction.

On the other hand, a colored thermoplastic resin (hereinafter referred to as colored resin) b supplied into the colored resin supply path 5 of the probe 2 is sent from the orifice 8 of the probe 2 into the manifold 3.
Here, the orifice 8 is located in the manifold 3 at a location where the flow of the transparent resin a in the width direction occurs. Accordingly, the colored resin b exiting from the orifice 8 is affected by the flow of the transparent resin a as follows.
The colored resin b delivered from the orifice 8 flows in the delivery direction (substantially the sheet extrusion direction). The flow direction of the colored resin b close to the orifice 8 is the sheet pushing direction. The flow of the portion of the colored resin b that contacts the transparent resin a is changed by the flow of the transparent resin a. Since the flow vector A of the transparent resin a has a flow vector in the width direction of the manifold 3 as described above, the outer portion of the colored resin b (portion close to the transparent resin a) flows in the transparent resin a. The vector B of the original colored resin b flow and the vector A of the transparent resin a flow flow as a combined vector C. In the central portion of the colored resin b where the influence of the flow of the transparent resin a is small, the flow almost flows in the sheet pushing direction.

  Thus, since the direction of the resin flow vector is different between the inner side in the thickness direction of the colored resin b and the outer side (side closer to the transparent resin a), as shown in FIGS. 5 (a) to (c), The width of the colored band 12 becomes gradually longer, and the thickness of the tip portion on the moving side of the colored band 12 becomes very thin. Moreover, since the transparent resin a exists on the moving direction side of the outer portion of the colored resin b, the colored resin b is diluted with the transparent resin a.

The sheet thus obtained is colored between the first resin portion 10 made of only transparent resin and the first resin layers 11 and 11 made of transparent resin, as shown in FIG. 5 (c). A colored portion 13 having a three-layer structure sandwiched between the bands 12 is formed in the width direction. In the coloring portion 13, a gradation portion 14 is formed which becomes gradually thinner from the dark portion toward the first resin portion 10 side.
The shape of the gradation portion 14 includes the position of the orifice 8 provided in the probe 2 in the manifold 3, the shape and size of the orifice 8, the supply amount and flow rate of the transparent resin a and the colored resin b, the viscosity of each resin, and the like. Determined by.

  When the position of the orifice 8 of the probe 2 is moved toward the slit 6 in the manifold 3, the flow component in the width direction that the colored resin b receives from the transparent resin a becomes small. Thus, the width of the colored band 12 and the gradation portion 14 becomes small. Conversely, when the position of the orifice 8 of the probe 2 is moved to the back side in the manifold 3, the flow component in the width direction that the colored resin b receives from the transparent resin a becomes large. The width increases. As the orifice 8 shape of the probe 2 is increased in the width direction, the width of the colored band 12 and the gradation portion 14 is increased.

  If the ratio between the supply amount of the colored resin b and the supply amount of the transparent resin a is changed, the flow vector A of the transparent resin a and the flow vector B of the colored resin b are changed. The cross-sectional shape and width dimension of the gradation part 14 vary. The ratio of the supply amount of the colored resin b and the supply amount of the transparent resin a is preferably, for example, the supply amount of the color resin b / the supply amount of the transparent resin a = 0.5 / 10 to 2/10. Further, the temperature of the colored resin b and the transparent resin a is preferably approximately isothermal, but is not limited.

  In the present invention, the thermoplastic resin used as the transparent resin a and the colored resin b different from that is, for example, polyethylene, polypropylene, polystyrene, polycarbonate, vinyl chloride resin, nylon resin, polyvinyl acetal, acrylic resin, acetal resin, Examples thereof include thermoplastic resins such as polyester resins. As the transparent resin a and the colored resin b, one kind or two or more kinds which can be integrated with each other is selected. Plasticizers, fillers, and the like may be added to these thermoplastic resins. As the laminated glass sheet, it is preferable to use a polyvinyl butyral resin plasticized to the transparent resin a and the colored resin b.

On the other hand, FIG. 14 shows a mold structure on the side of the extrusion path (2) for producing the multilayer resin sheet. The extrusion path (2) for forming the multilayer resin sheet includes an extrusion mold 1x and a feed block 2x.
The mold 1x is formed with a manifold 3x, and the manifold 3x is formed with a land 4x. The resin supplied to the manifold 3x spreads in the manifold and then passes through the slits of the land 4x to be formed into a sheet shape. On the other hand, the feed block 2x is connected to the back surface of the mold 1x and is connected to the manifold 3x.
The feed block 2x has two paths, a supply path c and a supply path d, for supplying two types of resins.

Two types of transparent resin c and transparent resin d can be supplied to the feed block 2x from the respective paths. In the feed block, a supply path c separated into two paths is formed with the supply path d interposed therebetween, and the supply path c and the supply path d are an integral path at the outlet of the feed block 2.
Therefore, the supplied resin is collected in a single path in the feed block and discharged as a multilayered resin, and this process is sealed, and since the high temperature resin contacts, the contact surface of each resin is A multi-layered resin is formed while maintaining a close contact state. Since the multi-layered resin spreads in the manifold 3 while maintaining the multi-layered state, it passes through the slits of the land 4x and is formed into a multi-layer resin sheet.
Here, the feed block that discharges a three-layered resin using two types of thermoplastic resins has been described. However, the feed block may be any one that discharges a multi-layered resin. Therefore, the feed block is provided with a plurality of supply paths, and it is sufficient that the feed block has an integrated path at the outlet of the feed block. In addition, the resin to be multilayered is not limited to different types of resins, and is not particularly limited as long as each layer is recognized as a different layer, such as different additives and colors even if the resin type is the same. The multilayer resin sheet may be colored but is preferably transparent.

FIG. 15 shows an overall structure 1xx of a mold having an extrusion path (1) and an extrusion path (2).
Mold 1 forming the extrusion path (1) and the extrusion path (2), mold 1x (which is expressed as a separate body for the sake of convenience and is originally an integral mold structure 1xx. This may be assembled as a mold to form an integrated mold 1xx.) The extrusion path 111 from the outlet of the die joins in the middle. This process is sealed, and is extruded as an integral sheet in which the layers are in close contact after the surface of the high-temperature thermoplastic resin sheet comes into contact at the joining portion of the extrusion path 111.

(Example 2)
FIGS. 6 to 9 show other preferred embodiments. In this embodiment, a die plate 20 is used in place of the probe 2 of the first embodiment of the mold 1a.
The die plate 20 is fixed to the back side of the manifold 31, and a nozzle portion 24 formed at the tip of the die plate 20 projects into the manifold 31. The nozzle portion 24 is provided over almost the entire width of the manifold 31, and the end portion of the nozzle portion 24 on the first resin inlet 41 side is bent so that the flow of the first resin is not disturbed. An opening 25 is provided on the resin inlet 41 side of the nozzle portion 24. As shown in FIG. 8, the opening 25 is formed in a horizontally long shape, and includes a rectangular first opening 26, semicircular second openings 27 provided on both sides of the first opening 26, and Three openings 28 are provided. The third opening 28 has a smaller radius of curvature than the second opening 27, and the tip of the third opening 28 protrudes compared to the second opening 27. The nozzle portion 24 is provided with a resin supply path 29 for supplying the transparent resin a. The resin supply path 29 penetrates the extrusion mold 1.

  The manifold 31 has a substantially triangular cross section. The manifold 31 has three wall surfaces, and one wall surface 32 is provided on the back side of the manifold 31. The rear wall surface 32 is arranged vertically, and the other two wall surfaces 33, 34 are continuously inclined from the upper and lower portions of the rear wall surface 32 toward the land portion 7. The front end portions of the inclined surfaces 33 and 34 are separated by a gap having the same dimensions as the slit 6. The nozzle portion 24 protrudes into the manifold 31 from the inner wall surface 32, and the space of the manifold 31 is divided into two vertically by the nozzle portion 24. The vertical width dimension of the opening 25 provided in the nozzle portion 24 is preferably 1/2 or less, more preferably 1/10 to 1/3, of the vertical width dimension of the slit 6.

Next, a method for producing a thermoplastic resin sheet using the above-described apparatus will be described.
This apparatus is different from the first embodiment only in that the colored resin b is supplied into the manifold 31 from the opening 25 provided in the die plate 20 part.
The colored resin b fed into the manifold 31 from the opening 25 is affected by the flow of the transparent resin a in the manifold 31, and the colored band 12 of the colored resin b is embedded in the transparent resin a as described above. A thermoplastic resin sheet is obtained. In this aspect, the shape and size of the colored band 12 are the position in the opening 25 manifold 31, the shape and size of the opening 25, the supply amount and flow rate of the transparent resin a and the colored resin b, the viscosity of each resin, and the like. Determined by.

(Example 3)
Still another embodiment is shown in FIGS. In this embodiment, instead of the probe 2 of the mold 1a of the first embodiment, a probe 35 having different outer diameters in the axial direction is used. As the probe 35 moves from the resin inflow path side (left side in FIG. 10) to the right side, the outer diameter of the probe 35 gradually decreases. Accordingly, the position of the orifice 38 provided in the probe 35 is sequentially located in the back of the manifold 3 as it goes to the right side of the probe 35.

When extruding a sheet using such an apparatus, the colored resin b fed from the right side portion of the orifice 38 to the manifold 3 is more transparent than the colored resin b fed from the left side portion of the orifice 38. Since the resin flow vector in the width direction is large, the width of the colored band 12 and the gradation portion 14 can be formed relatively large.
That is, the right side portion of the orifice 38, particularly the right end portion, is located in the back of the manifold 3 as compared with the other portions. As a result, the colored resin b fed from the right end portion is more Under the influence of the flow in the direction, the thickness of the front end portion of the colored band 12, that is, the gradation portion 14 is further reduced.

The shape of the probe 35 can be variously changed as shown in FIG. 12 and FIG. The probe 2 shown in FIG. 12 has a circular cross-sectional shape and is configured to have a smaller diameter from one end side to the other end side. The probe 2 shown in FIG. 13 has an elliptical cross-sectional shape. Is.
Example 4
You may change into the extrusion path | route (not shown) corresponding to a T-die system different from the extrusion path | route (1) described in Example 1. FIG. For example, a probe is provided, side plates are provided on both sides of the manifold in the width direction, a first resin supply path for supplying a first thermoplastic resin into the manifold, and the first thermoplastic resin is connected to the manifold. A land portion is provided at an outlet that is pushed out to the outside, the probe is disposed in the manifold, and both end portions thereof are respectively supported by the both side plates, and the probe is colored in the manifold. A colored resin supply path for supplying a thermoplastic resin is provided, and the opening of the colored resin supply path is provided at an intermediate position in the flow of the first thermoplastic resin in the manifold in the outlet direction. The extrusion path (1) of the thermoplastic resin sheet in which the opening of the colored resin supply path is arranged at the edge in the width direction of the thermoplastic resin flow, while the extrusion path ( ) May be an apparatus having a.
That is, regardless of whether the structure of the extrusion path (1) is the L die type or the T die type, the high-temperature thermoplastic resin sheet supplied from the extrusion path (1) and the extrusion path (2) at the junction of the extrusion path Can be extruded as an integral sheet with the layers in close contact.

The horizontal sectional view of the manufacturing device of the thermoplastic resin sheet of the present invention. II-II sectional view taken on the line of FIG. The front view of the probe of a manifold part. The figure explaining the flow of transparent resin and colored resin. (A)-(c) is an effect explanatory view of a thermoplastic resin sheet. The horizontal sectional view of the other suitable example of an embodiment of the manufacture device of the thermoplastic resin sheet of the present invention. VII-VII sectional view taken on the line of FIG. (A), (b) is the front view and top view of FIG. IX-IX sectional view taken on the line of FIG. The horizontal sectional view of the other suitable example of an example of the manufacturing apparatus of the thermoplastic resin sheet of this invention. XI-XI sectional view taken on the line of FIG. (A), (b) is the front view and top view of another probe. (A), (b) is the front view and top view of another probe. The metal mold | die schematic diagram by the side of the extrusion path | route (2) which manufactures the multilayer resin sheet of this invention. FIG. 15 is a cross-sectional view taken along line AA in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mold for extrusion molding 2 ... Probe 3, 31, 35 ... Manifold 4 ... 1st resin supply path 5 ... Colored belt resin supply path 6 ... Slit 7 ... Land part 7, 8 ... Opening 10 …… First resin portion 11 …… First resin layer 12 …… Colored band 13 …… Colored portion 14 …… Gradation portion 20 …… Die plate 24 …… Nozzle portion 25 …… Opening portion a …… 1st thermoplastic resin b ...... Colored thermoplastic resin 1x ... Extrusion mold 2x ... Probe 3x ... Manifold 4x ... Land c ... Second thermoplastic resin supply path d ... Third thermoplastic resin supply path

Claims (4)

  A first resin layer made of the first thermoplastic resin and a colored band made of a colored thermoplastic resin are embedded in the width direction in the first resin layer formed of the first thermoplastic resin. An extrusion path (1) for producing a thermoplastic resin sheet is incorporated in one of the molds, the extrusion path (1) includes a probe, and side plates are provided on both sides in the width direction of the manifold, A land portion is provided at a first resin supply path for supplying the first thermoplastic resin into the manifold, and an outlet through which the first thermoplastic resin is pushed out from the manifold. And both ends thereof are respectively supported by the both side plates, and the probe has a colored resin supply path for supplying a colored thermoplastic resin into the manifold, and an opening of the colored resin supply path Part is the first The opening of the first resin supply path and the colored resin supply path are provided in a position where the thermoplastic resin has a flow in the width direction in the manifold, and toward the flow direction in the width direction of the first thermoplastic resin. The extrusion path (1) of the thermoplastic resin sheet in which the openings are arranged in this order and the extrusion path (2) for producing a multilayer resin sheet made of a thermoplastic resin are incorporated in the other of the mold, The extrusion path has a feed block formed with a combined flow path in which a plurality of thermoplastic resin supply paths are gathered into one, and a multi-layered thermoplastic resin is pushed out from the manifold through the feed block. A multi-layer resin sheet extrusion path (2) having a portion, wherein the extrusion path (1) and the extrusion path (2) merge and are discharged from the mold outlet in the width direction. Buried The thermoplastic resin sheet manufacturing device having a layer structure. A first resin layer made of the first thermoplastic resin and a colored band made of a colored thermoplastic resin are embedded in the width direction in the first resin layer formed of the first thermoplastic resin. an apparatus for producing a thermoplastic resin sheet are, and extrusion path (1) is incorporated into one of the mold, the extrusion path (1) is provided with a Daipure bets, a manifold, a first in the manifold A land portion is provided at a first resin supply path for supplying the thermoplastic resin and an outlet through which the first thermoplastic resin is pushed out from the manifold, and the die plate is formed on a wall surface on the back side of the manifold. In addition to being fixed, the die plate has a nozzle portion for supplying colored thermoplastic resin into the manifold, and the opening of the nozzle portion has a flow of the first thermoplastic resin in the width direction within the manifold. position Provided, and toward the width direction of the flow direction of the first thermoplastic resin, a thermoplastic resin sheet in which the opening of the opening portion of the first resin feed passage colored resin feed passage are arranged in this order The extrusion path (1) and the extrusion path (2) for producing a multilayer resin sheet made of thermoplastic resin are incorporated in the other mold, and one extrusion path is provided for a plurality of thermoplastic resins. A multi-layer resin sheet extrusion path (2) having a feed block in which a combined flow path is formed and having a land portion through which the multilayered thermoplastic resin is pushed out from the manifold through the feed block. The extrusion path (1) and the extrusion path (2) are merged and discharged from the mold outlet, and a thermoplastic resin sheet having a multilayer structure in which colored bands are embedded in the width direction is provided. apparatus.   A first resin layer made of the first thermoplastic resin and a colored band made of a colored thermoplastic resin are embedded in the width direction in the first resin layer formed of the first thermoplastic resin. An extrusion path (1) for producing a thermoplastic resin sheet is incorporated in one of the molds, the extrusion path (1) includes a probe, and side plates are provided on both sides in the width direction of the manifold, A land portion is provided at a first resin supply path for supplying the first thermoplastic resin into the manifold, and an outlet through which the first thermoplastic resin is pushed out from the manifold. And both ends thereof are respectively supported by the both side plates, and the probe has a colored resin supply path for supplying a colored thermoplastic resin into the manifold, and an opening of the colored resin supply path Part is the first Thermoplastic in which the opening of the colored resin supply path is arranged at the edge in the width direction of the flow of the first thermoplastic resin, provided in the middle of the flow of the thermoplastic resin flowing in the outlet direction in the manifold The extrusion path (1) of the resin sheet and the extrusion path (2) for producing the multilayer resin sheet made of thermoplastic resin are incorporated in the other mold, and a plurality of thermoplastic resin supply paths are provided in the extrusion path. Multi-layer resin sheet extrusion path (2) having a feed block formed with a combined flow path formed into one, and having a land portion through which the multilayered thermoplastic resin is pushed out from the manifold through the feed block A thermoplastic resin sheet having a multilayer structure in which colored bands are embedded in the width direction, wherein the extrusion path (1) and the extrusion path (2) merge and are discharged from the mold outlet Manufacturing equipment. It forms with the 1st resin layer which consists of a 1st thermoplastic resin, and this 1st thermoplastic resin using the thermoplastic resin sheet manufacturing apparatus of any one of Claims 1-3. A thermoplastic resin sheet in which a colored band made of a thermoplastic resin colored in the first resin layer is embedded in the width direction is formed on one side of the mold, and a multilayer resin sheet is formed on the other side of the mold And a method for producing a thermoplastic resin sheet having a multilayer structure in which colored bands are embedded in the width direction, which are merged in an extrusion path before being discharged from a mold outlet.

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