JP4600066B2 - Laminate film manufacturing apparatus and method - Google Patents

Description

  The present invention relates to an apparatus and a method for manufacturing a laminated film.

  In general, a laminated film obtained by laminating a plurality of molten materials in the thickness direction is used in various applications, and among them, the use of a multilayer laminated film in which the number of laminated layers is 5 or more is diverse. For example, it is utilized as what can prevent the breakage | damage and scattering of glass significantly by affixing the film laminated | stacked on the glass surface excellent in tear resistance. Moreover, the demand as an optical interference film is also high. For example, when a large number of layers having a high refractive index and layers having a low refractive index are alternately laminated, an optical interference film that selectively reflects or transmits light of a specific wavelength by structural light interference between these layers. Such multilayer laminated films have a wide range of uses for reflective polarizing plates, colored films, metallic gloss films, reflective mirror films, etc., by making the wavelength region of light that is selectively reflected or transmitted visible light. is there.

  As an apparatus and method for manufacturing a laminated sheet, conventionally, a plurality of layers (particularly, two types) of molten resin are supplied to each manifold, and the molten resin from each manifold is divided into a plurality of layers by dividing it through a plurality of slits. And is discharged from a die having a slit gap extending in the film width direction perpendicular to the direction of the laminated molten resin layers and the flow direction of the laminated molten resin layers after passing through the slits. . The laminated sheet discharged from the die is then subjected to stretching or the like in some cases and formed into a laminated film.

  Such a laminated film manufacturing apparatus is configured, for example, as shown in FIG. FIG. 1 is a schematic perspective view of a configuration example of a general laminated film manufacturing apparatus. In this apparatus, different types of molten resins are introduced and laminated from the resin introduction pipe (A) 1 and the resin introduction pipe (B) 2 into the laminating apparatus 3 provided with the manifold and slit as described above. Thereafter, the molten materials thus laminated are widened in the film width direction in the die 5 through the conduit 4 and discharged as a laminated sheet 6 through a slit gap in the die (not shown). The discharged laminated sheet 6 is brought into contact with the surface of a casting drum 7 which is a cooling and solidifying means, for example, and is cooled and solidified to become an unstretched film 8. A layer or an easy-adhesion layer is formed, or after being stretched simultaneously or sequentially in the film width direction or the film flow direction in a stretching step (not shown), it is wound to form a laminated film (not shown).

  A laminating apparatus 9 that the present inventors consider suitable as the laminating apparatus 3 is configured as shown in FIG. 2, for example. FIG. 2 is a schematic perspective view showing the internal space of the laminating apparatus 9 of FIG. 1, and shows the space portion formed in the laminating apparatus 9, that is, the flow path of the molten material. The laminating apparatus 9 expands the resin introduction paths 10 and 11 for introducing the A resin and the B resin as molten materials into the inside thereof, and the A resin and the B resin introduced by the introduction paths 10 and 11 in the film lamination direction. Manifolds 12 and 13 and rows of slits 14 and 15 for guiding the molten materials from the manifolds 12 and 13 to the downstream side are further provided. A certain junction is provided, and the A resin and B resin from the slits 14 and 15 are alternately laminated in multiple layers so that a multilayer laminated sheet can be formed. At this time, the merging center plane of the A resin and the B resin is 28. Each of the slits 14 and 15 is formed, for example, by providing a slit plate processed in a comb shape at the center of the laminating apparatus 9, and each resin manifold 12 and 13 is provided on both sides thereof, and each resin is in the slit. To flow into.

  In recent years, for example, in laminated films for optical applications manufactured using these apparatuses, there is an increasing demand for an increase in the number of laminations that determine the optical characteristics and the lamination accuracy of each layer. As a means for controlling the stacking accuracy, for example, a technique as disclosed in Patent Document 1 is known. This is to control the temperature distribution of a laminating apparatus (multilayer feed block) that branches the molten material into multiple layers, thereby optimizing the flow of the molten material and improving the laminating accuracy.

Further, in the conventional laminated film manufacturing apparatus, various studies have been made for the purpose of improving the laminating accuracy of the junction where a plurality of molten materials merge as described above. There was no disclosure of the technology, and it was only necessary to join the devices. In other words, the effect of the flow path shape on the stacking accuracy after completion of the stacking (after joining) has not been studied in detail, and the laminated molten material flows into the base through the conduit flow path connecting the stacking apparatus and the base, In general, it is widened once in the thickness direction as well as widened in the film width direction.
JP 2003-112355 A

  However, in the above-described conventional technology, it is necessary to control the temperature corresponding to each layer in the feed block with high accuracy, and the entire equipment including the heater and the control device becomes complicated and huge, which is required for improvement and maintenance of the equipment. There is a problem that the cost becomes very large.

  In addition, according to the knowledge of the present inventors, as described above, it is a lamination completion part (merging part) that a plurality of molten materials undergo a process of being greatly widened once in the lamination direction of the film after lamination. It was found that the stacking accuracy deteriorated regardless of the stacking accuracy.

  The object of the present invention is to focus on the above-mentioned problems, and by optimizing the molten material flow path after laminating in the film laminating direction, a simple and highly effective laminated film manufacturing apparatus that does not require a complicated apparatus configuration or control apparatus Is to provide. Another object of the present invention is to provide a method for producing a laminated film using the laminated film producing apparatus.

In order to achieve the above object, according to the present invention, a laminating apparatus for laminating a plurality of molten materials, a widthwise widening section for widening the molten material laminated in the laminating apparatus in the film width direction, and the widthwise widening A laminated film manufacturing apparatus comprising a die having a slit gap for extruding the molten material widened in a section, wherein the molten material is laminated in a laminating direction and a central axis of the molten material flow path (where the flow path The central axis represents a representative path of the flow of the laminated molten material, and the central axis is a point in the central surface of the molten material where the molten material flows. A line that is generally a curved line with a point located in the center of the flow path in the stacking direction as a starting point and a point positioned in the center in the stacking direction and the film width direction at the exit of the slit gap as an end point. The center plane is a plane that includes the stacking direction in the stacking completion part and that divides the volume of the flow path of the molten material from the inlet of the stacking apparatus to the stacking completion part. ) , The angle α formed by the wall surface forming the flow path of the molten material and the central axis in each part between the lamination completion part and the widthwise widening part inlet in the laminating apparatus is −85 °. More than + 15 ° (the angle α is minus in the direction in which the flow of the molten material is reduced, plus in the direction in which it is widened, and 0 ° in the direction parallel to the central axis) A film manufacturing apparatus is provided.

  In addition, the value of t2 / t1 is 0.02 or more and 2 or less, where t1 is the stacking direction dimension of the stacking completion portion in the molten material flow path, and t2 is the stacking direction dimension of the widthwise widened portion entrance. An apparatus for producing a laminated film is preferable.

  In particular, when the stacking direction dimension of the stacking completion portion in the flow path of the molten material is t1, and the stacking direction dimension of the widthwise widened portion entrance is t2, the value of t2 / t1 is 0.2 or more and 1.05 or less. An apparatus for producing a laminated film is preferable.

  Moreover, when the dimension of the slit gap in the stacking direction is t3, a laminated film manufacturing apparatus characterized by t3 ≦ t1 and t3 ≦ t2 is also preferable.

  Further, when the area of the cross section orthogonal to the central axis of the flow path of the stacking completion portion is A1, and the area of the cross section orthogonal to the central axis of the width direction widening portion entrance is the A2 / An apparatus for producing a laminated film, wherein the value of A1 is 0.8 or more and 1.2 or less is also preferable.

  Further, when the circumferential length of the cross section orthogonal to the central axis of the flow path of the lamination completion portion is L1, and the peripheral length of the cross section orthogonal to the central axis of the flow path of the widthwise widened portion entrance is L2, L2 An apparatus for producing a laminated film, wherein the value of / L1 is 0.8 or more and 1.2 or less is also preferable.

  According to the present invention, a plurality of molten materials are supplied to the laminated film manufacturing apparatus according to any one of the above, and the molten materials stacked from the slit gap of the laminated film manufacturing apparatus are extruded. Provided is a method for producing a laminated film, which comprises cooling and solidifying to form a laminated film.

  Fig.3 (a) is a schematic sectional drawing showing a part of one Embodiment of the manufacturing apparatus of the laminated | multilayer film of this invention. In FIG. 3A, the horizontal direction in the figure is the lamination direction of each molten material layer, the vertical direction is the central axis direction of the flow path of the molten material, and the direction perpendicular to the paper surface (in the lamination direction and the central axis direction of the flow path) The direction perpendicular to each other is the film width direction. In FIG. 3A, for the sake of simplicity, the central axis 27 of the flow path is in a straight line in the three-dimensional space from the stacking completion portion 16 of the stacking apparatus 9 to the slit gap 25, and the stacking direction is the stacking apparatus 9 FIG. 2 illustrates a case where the layers from the stacking completion part 16 to the slit gap 25 are coincident with each other, and shows a cross section including the central axis 27 of the flow path. FIG. 3B is a diagram showing a cross section in the in-plane direction including the central axis of the flow path of the die shown in FIG. In FIG. 3B, the horizontal direction in the figure is the film width direction, the vertical direction is the central axis direction of the flow path of the molten material, and the direction perpendicular to the paper surface is the lamination direction. The molten material that has been stacked in the stacking completion part 16 of the stacking apparatus 9 passes through the flow path 21 in the conduit 20 that connects the stacking apparatus 9 and the base 22, and then passes through the width-direction widening section inlet 23 to the base 22. The film is widened in the film width direction by the inner manifold 24, passes through the slit gap 25, and is discharged in a sheet form from the slit gap outlet 17. Here, the lamination completion part 16 is a cross section including the lamination direction of the molten material, and contacts among all the layers laminated in the laminating apparatus among the portions where the resin of each layer contacts the adjacent layer for the first time. A cross section including a point on the most downstream side of the flow path. The width-direction widened portion inlet 23 is a cross section of the flow path perpendicular to the central axis of the flow path of the molten material, and the molten material laminated at the lamination completion portion 16 starts widening in the film width direction. The uppermost cross section of the flow path.

FIG. 4 shows the details centering on the conduit portion of FIG. FIG. 4 shows a cross section in the plane including the laminating direction of the flow path of the molten material, that is, the flow path of the molten material and the central axis of the flow path, formed in the laminating apparatus 9, the conduit 20 and the base 22, and is the same as FIG. The horizontal direction in the figure is the lamination direction of the molten material, the vertical direction is the central axis direction of the flow path of the molten material, and the direction perpendicular to the paper surface is the film width direction. According to the knowledge of the present inventors, in FIG. 4, the wall surface 26 that forms the flow path of the molten material in each part from the lamination completion part 16 to the widthwise widened part inlet 23, and the lamination of the molten material By setting the angle α between the direction and the central axis 27 of the flow path of the molten material within the above range, the lamination accuracy of the laminated film to be molded can be improved. Here, when the wall surface 26 and the central axis of the flow path have different angles in each part, the respective angles α _i (i = 1, 2, 3...) Are all in the above range. That is, according to the knowledge of the present inventors, in the section from the stacking completion portion 16 to the widthwise widening portion inlet 23, if there is a section where the flow path shape is widened by exceeding α = 15 ° in the stacking direction, The boundary surface of each layer of the melted material becomes unstable, the amount of widening of each layer varies, and the lamination accuracy of the formed laminated film is significantly deteriorated. On the other hand, when the flow path shape is reduced in the stacking direction, the boundary surface of each layer of the molten material is relatively stable, the ratio of the reduced width of each layer is substantially constant, and the stacking accuracy is unlikely to deteriorate. If there is still a section of α = -85 ° or less, the flow path will be greatly bent, the boundary surface of each layer of molten material will be disturbed, the lamination accuracy will deteriorate, and in some cases the molten material will stay and melt. There is a problem that the material is thermally deteriorated. If there is at least one wall surface having an angle α deviating from the above range, a desired stacking accuracy may not be obtained.

  Here, the central axis 27 of the flow path is defined in detail.

  The central axis of the flow path represents a typical path of the flow of the laminated molten material. This central axis is a point in the center of the merged center of the molten material, and is located at the center in the stacking direction of the flow path in the stacking completion part 16 (left and right at the stacking completion part 16 in FIG. 3A). A point located at the center in the laminating direction and the film width direction at the slit gap outlet (corresponding to the center point) (both center points on the left and right at the slit gap outlet 17 in FIGS. 3A and 3B) Is generally a curved line. Here, the molten material confluence center plane is a plane including the stacking direction in the stacking completion part, and is a plane that bisects the volume of the flow path of the melted material from the inlet of the stacking apparatus to the stacking completion part. Say. FIG. 5 is a cross-sectional view in a cross section perpendicular to the laminating direction of the laminating apparatus 9 described above. As in this example, when the molten materials merge symmetrically, the merged central surface 28 of the molten materials is a plane that bisects the flow path space of the laminating apparatus 9 to the left and right. If the volume of the left channel in FIG. 5 is larger than that on the right side, the merge center plane 28 is inclined to the left.

As described above, the central axis 27 of the flow path is a point in the merging center plane in the stacking completion portion 16 and starts from the central point G ₀ in the stacking direction of the flow paths. The next point on the central axis of the flow path is in the downstream direction at the point G ₀ ^{′ which is the} in-plane direction of the merging center and is perpendicular to the stacking direction in the downstream direction D ₀ by a minute length Δ. This is the barycentric point G ₁ of the plane figure (flow channel cross section) surrounded by the intersection of the vertical plane P ₁ and the flow channel. Flow path points further next on the central axis of, G ₁ that advances to the flow direction D ₁ toward the center of gravity G ₁ from the center point G ₀ of new starting point and destination G ₁ by a small length Δ ^'in a center of gravity G ₂ of plane figure surrounded by the line of intersection of a plane perpendicular P ₂ and the flow path in the flow path direction D _1. Similarly, a curve connecting the center of gravity points of the cross section of the flow path toward the downstream is the central axis 27 of the flow path. This is shown in FIG. FIG. 6 illustrates a method for determining the central axis 27 of the flow channel when the flow channel is bent in the stacking direction, and illustrates a cross section of the molten material at the merged central plane.

Next, the angle α formed by the central axis 27 of the flow path and the wall surface will be defined in detail. In FIG. 4, the portion of the wall surface 26 that forms an angle α with the central axis 27 is a point wx where a straight line extending in the laminating direction from each point x of the central axis 27 in the flow path cross section and the wall surface 26 intersect. . The angle α is defined as an angle formed by the direction Dwx of the wall surface 26 in the plane including the straight line and the flow path direction and the flow path direction Dx at this point. This is shown in FIG. FIG. 7 exemplifies a method of determining the angle α when the flow path is bent in the stacking direction, and illustrates a cross section in a plane including the stacking direction of the flow path and the direction of the central axis 27 of the flow path. It is. However, the wall surface 26 is a surface that is in contact with the molten material, and includes processing such as scratches and dents on the wall surface, irregularities due to surface roughness of the wall surface, holes for measuring temperature, and chamfering. Absent. In order to show a state in which the angle α is determined by eliminating these influences, the case of FIG. 4, which shows a case where the flow path is not bent and the central axis 27 of the flow path is formed in a straight line, is taken as an example. explain. Here, FIG. 8 is a schematic cross-sectional view showing a part of an embodiment of the laminated film manufacturing apparatus of the present invention, and is an explanatory view of how the angle α is determined. In the flow channel having the shape as shown in FIG. 4, the diameter is ¼ of the smaller dimension among the dimensions in the stacking direction of the stacking completion portion 16 or the widthwise widening portion inlet 23 along the wall surface 26 as shown in FIG. 8. The angle formed between the movement locus of the center of the circle 29 and the center axis 27 when the circle 29 of t1 / 4 or t2 / 4 is rolled is approximated to the angle α. In addition, the angle α represents an angle formed with the central axis 27 with respect to the flow direction of the molten material, the direction in which the resin flow is reduced is minus (α ₁ and α ₄ in FIG. ₄ ), and the direction in which the resin is widened is plus ( the alpha ₂ and alpha _5), the direction parallel to the central axis 27 is defined as 0 ° (the alpha ₃ and alpha _6).

  In the present invention, there is a specific relationship between the stacking direction dimension t1 of the stacking completion part 16, the stacking direction dimension t2 of the widthwise widened part inlet 23, and the stacking direction dimension t3 of the slit gap outlet 17 of the base. It is preferable to have.

  That is, it is preferable that the value of t2 / t1 is 0.02 or more and 2 or less. When this value exceeds the above range, the same problem as the above-described retention problem occurs, and the stacking accuracy may deteriorate. Furthermore, according to the knowledge of the present inventors, it is more preferable that the value of t2 / t1 is 0.2 or more and 1.05 or less. In other words, higher stacking accuracy can be obtained by making the change in t1 and t2 smaller.

  Moreover, it is preferable that t3 ≦ t1 and t3 ≦ t2. That is, it is not preferable to go through the process of widening in the laminating direction again after the lamination is completed and immediately before becoming the laminated sheet after widening in the width direction, since the deterioration of the laminating accuracy due to staying becomes more noticeable.

  Here, t1, t2, and t3 are the average values of the dimensions in the stacking direction of the channels at the points arranged at equal intervals in the direction orthogonal to the channel direction and the stacking direction in the channel cross sections at the respective positions. Say.

  In the present invention, between the area A1 and the circumferential length L1 of the cross section orthogonal to the central axis of the flow path in the lamination completion portion 19, and the same area A2 and the circumferential length L2 in the widthwise widened portion inlet 23 Preferably have a specific relationship.

  That is, the value of A2 / A1 is preferably 0.8 or more and 1.2 or less. Moreover, it is preferable that the value of L2 / L1 is 0.8 or more and 1.2 or less. This is to make the pressure loss of the lamination completion portion 19 and the widthwise widening portion inlet 23 substantially the same. If the pressure loss is outside the above range, the retention of the molten material tends to be remarkable and the lamination accuracy tends to deteriorate.

  According to the present invention, as described below, in the laminated film manufacturing apparatus, the shape of the flow path cross section from the lamination completion part in the lamination apparatus to the widthwise widening part in the die is made into a specific relationship, so that after lamination Therefore, it is possible to manufacture a laminated film with higher lamination accuracy.

  Embodiments of the present invention will be described in detail below, but the present invention is not limited to the embodiments including the following examples, can achieve the objects of the invention, and does not depart from the gist of the invention. Various changes within the scope are naturally possible.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, it is assumed that the central axis of the flow path is formed in a straight line from the lamination completion part of the laminating apparatus to the slit gap of the die.

FIG. 9 is a schematic view showing a cross section in the film width direction of a channel portion formed inside a laminating apparatus, a conduit, and a base as an example of an embodiment of the present invention. Two types of molten resin extruded from an extruder (not shown) are laminated in a laminating apparatus 9. The molten resin that has been laminated in the lamination completion section 16 of the lamination apparatus 9 passes through the flow path in the conduit 20 that connects the lamination apparatus 9 and the base 22, and then passes through the width-direction widening section inlet 23 in the base 22. After that, it is widened in the width direction and discharged onto a casting drum (not shown) in the form of a sheet. Here, the flow path between the stacking completion part 16 and the width direction widening part inlet 23 is always reduced in width, and the angles α _{1 to} α ₄ are all formed to be 0 ° to −85 °. ing. In addition, the stacking direction dimension of the stacking completion part 16 is t1, the cross-sectional area perpendicular to the central axis of the flow path in the stacking completion part 16 is A1, the circumferential length is L1, and the stacking of the widthwise widening part inlet 23 is similarly performed. Assuming that the direction dimension is t2, the same area at the widthwise widened portion entrance 23 is A2, and the same circumference is L2, the flow is such that the above relationship is established among t2 / t1, A2 / A1, and L2 / L1. A road is formed.

FIG. 10 is a schematic view showing a cross section in the film width direction of a space portion formed inside a laminating apparatus, a conduit and a base as an example of an embodiment of the present invention different from FIG. In FIG. 10, the flow path between the stacking completion portion 16 and the widthwise widening portion inlet 23 is configured so that it does not shrink or widen immediately after the stacking is completed, and then contracts once and then widens. The angles are formed such that α ₁ and α ₄ = 0 °, α ₂ and α ₅ are in the range of 0 ° to −85 °, and α ₃ and α ₆ are in the range of 0 ° to 15 °. Similarly to the example shown in FIG. 9, a flow path is formed between t2 / t1, A2 / A1, and L2 / L1 so that the above relationship is established.

FIG. 11 is a schematic view showing a cross section in the film width direction of a space portion formed in a laminating apparatus, a conduit, and a base as an example of an embodiment of the present invention different from FIGS. 9 and 10. In FIG. 11, the flow path between the stacking completion portion 16 and the width-direction widening portion inlet 23 is formed with a uniform width without substantially shrinking or widening. That is, α ₁ and α ₂ = 0 °, and in the same way as the example shown in FIGS. 9 and 10, the flow paths are set so that the above relationship is established among t2 / t1, A2 / A1, and L2 / L1. Is formed.

  Further, in all the above embodiments, when the dimension in the stacking direction of the slit gap outlet 17 of the base is t3, in all the above embodiments, t3 ≦ t1 and t3 ≦ t2 are satisfied.

The result of actually manufacturing a laminated film and evaluating the lamination accuracy using the laminated film manufacturing apparatus of the present invention will be described. The specific method for producing a laminated film in this example is as follows.
(1) Polymer: A layer; polyethylene terephthalate (PET) resin (thermoplastic resin F20S manufactured by Toray Industries, Inc.), B layer: cyclohexanedimethanol copolymerized PET (thermoplastic resin PETG6763 manufactured by Eastman)
(2) Preparation: Each resin is dried and then supplied to the extruder. The extruder was set at 280 ° C., and after passing through a gear pump and a filter, each resin was supplied to the feed block and joined.
(3) Laminating apparatus (feed block): slit gap corresponding to each layer; A layer 0.75 mm, B layer 0.6 mm (both processing accuracy 0.01 mm), slit width 26 mm, slit length 18 mm, and A layer The resin was discharged from a slit composed of 101 layers and 100 B layers, the target lamination ratio was A: B = 2: 1, and both surface layer portions were A layers. In addition, the flow path cross-sectional shape of the lamination completion part is a rectangle.
(4) Flow path: The feed block and the base were combined so as to form a flow path as shown in FIG. Each dimension is as shown in Table 1. In addition, the flow path cross section of the width direction widening part entrance is a rectangle.
(5) Discharge: After the lamination is completed in the feed block, the laminated resin that has passed through the conduit is supplied to a T-die as shown in FIG. 1 and extruded into a sheet shape, and then the surface temperature is 25 by electrostatic application (DC voltage 8 kV). It was rapidly cooled and solidified on a casting drum kept at ° C. and molded.
(6) Surface treatment: The formed cast film is conveyed by a roll, and in the coating apparatus, both surfaces of the cast film are subjected to corona discharge treatment in the air, the wetting tension is 55 mN / m, and the glass transition temperature Tg18 is applied to the treated surface. A laminated film composed of a polyester resin at 0 ° C./a polyester resin having a Tg of 82 ° C./silica particles having an average particle diameter of 100 nm was applied to form a transparent, easy-to-slip and easy-adhesive layer.
(7) Heat treatment: Subsequently, the film was sequentially guided to a biaxial stretching machine, preheated with hot air at 95 ° C., and then stretched 3.5 times in the longitudinal direction (film longitudinal direction) and lateral direction (film width direction). Further, heat treatment was performed with hot air at 230 ° C., and at the same time, 5% relaxation treatment was performed in the vertical direction, followed by 5% relaxation treatment in the horizontal direction.

Moreover, the measurement and evaluation of the lamination | stacking thickness and lamination | stacking precision in a present Example were based on the following method.
(1) Lamination thickness: The layer structure of the film was determined by observation with an electron microscope with respect to a sample obtained by cutting a cross section using a microtome. That is, using a transmission electron microscope (HU-12 type, manufactured by Hitachi, Ltd.), the cross section of the film was magnified 3000 to 40000 times, a cross-sectional photograph was taken, and the layer structure and each layer thickness were measured. Samples were taken at 10 points that were roughly equally divided in the film width direction. In the examples, a sufficient contrast was obtained, but this was not performed. However, depending on the combination of resins used, the contrast may be increased using an appropriate dyeing technique.
(2) Lamination accuracy: A value obtained by dividing the difference between the maximum thickness and the minimum thickness of each of the A layers and B layers by the average thickness among the respective lamination thicknesses in each sample obtained in (1). The stacking accuracy of each of the A layer and the B layer of the sample is set, and the average value of the stacking accuracy of each sample is set as the stacking accuracy of the present embodiment.

  The results are shown in Table 1.

  A laminated film was produced in the same manner as in Example 1 except that the dimensions in FIG. 9 were changed as shown in Table 1. The results are shown in Table 1.

  A laminated film was produced in the same manner as in Example 1 except that the dimensions in FIG. 9 were changed as shown in Table 1. The results are shown in Table 1.

  A laminated film was produced in the same manner as in Example 1 except that the dimensions in FIG. 9 were changed as shown in Table 1. The results are shown in Table 1.

  The flow path was formed in the shape shown in FIG. Otherwise, a laminated film was produced in the same manner as in Example 1. The results are shown in Table 1.

The flow path was shaped as shown in FIG. 11 and the dimensions are shown in Table 1. Otherwise, a laminated film was produced in the same manner as in Example 1. The results are shown in Table 1.
[Comparative Example 1]
A laminated film was produced in the same manner as in Example 1 except that the dimensions in FIG. 9 were changed as shown in Table 1. The results are shown in Table 1.
[Comparative Example 2]
The flow path was formed in the shape shown in FIG. Otherwise, a laminated film was produced in the same manner as in Example 1. The results are shown in Table 1.

  Although this invention is suitable for manufacture of the multilayer laminated film comprised with a plastic film etc., the application range is not restricted to these.

It is a schematic perspective view of the manufacturing apparatus of a common laminated film. It is a fragmentary perspective view of internal space which shows the internal structure of the lamination apparatus of the manufacturing apparatus of a general laminated | multilayer film. It is a schematic film width direction sectional view which shows the manufacturing apparatus of the laminated | multilayer film of this invention. It is the schematic of the lamination direction cross section of the nozzle | cap | die part of Fig.3 (a). It is the elements on larger scale which show the detail of the conduit | pipe part of Fig.3 (a). It is sectional drawing in a cross section perpendicular | vertical to the lamination direction of a lamination apparatus. It is explanatory drawing which defines a central axis and is sectional drawing in the confluence | merging center plane of the molten material of a lamination apparatus. It is explanatory drawing which defines the angle of a wall surface, and is sectional drawing in the cross section in the plane containing the lamination direction of the flow path in the position x in the middle of a flow path, and the direction of the central axis 27 of a flow path. It is the schematic which showed the method to measure the angle which the wall surface of the conduit | pipe part of this invention and the central axis comprise. It is the schematic showing the film width direction cross section of the space part formed in the inside of the lamination apparatus which shows the example of 1 embodiment of this invention, a conduit | pipe, and a nozzle | cap | die. It is the schematic showing the film width direction cross section of the space part formed in the inside of the lamination apparatus which shows another example of this invention, a conduit | pipe, and a nozzle | cap | die. It is the schematic showing the film width direction cross section of the space part formed in the inside of the lamination apparatus which shows another example of this invention, a conduit | pipe, and a nozzle | cap | die.

Explanation of symbols

1 Resin introduction pipe (A)
2 Resin introduction pipe (B)
3 Multilayer Feed Block as Laminating Device 4 Conduit 5 Base 6 Resin Sheet 7 Casting Drum 8 Unstretched Film 9 Multilayer Feed Block 10 Resin Introducing Pipe (A)
11 Resin introduction pipe (B)
12 Manifold in the feed block 13 Manifold in the feed block 14 Slit in the feed block 15 Slit in the feed block 16 Lamination completion part 17 Slit gap outlet 18 Side plate 19 Slit plate 20 Conduit 21 In-conduit channel 22 Base 23 Widening in the width direction Part inlet 24 Manifold 25 in the base 25 Slit 26 in the base 26 Channel wall surface 27 Central axis 28 Confluence central surface 29 Circle approximating the wall shape

Claims (7)

A laminating device for laminating a plurality of molten materials, a widthwise widened portion for widening the molten material laminated in the laminating device in a film width direction, and a slit gap for extruding the molten material widened in the widthwise widened portion An apparatus for producing a laminated film having a die having a lamination direction of the molten material and a central axis of a flow path of the molten material (here, the central axis of the flow path is the center axis of the laminated molten material). It represents a typical flow path, and the central axis is a point in the central plane of the molten material where the molten material is joined, and the starting point is a point located at the center in the stacking direction of the flow path at the stacking completion portion. And a line that is generally curved, with the end point at the center in the laminating direction and the film width direction at the slit gap exit, and the in-plane of the merging center is the line in the laminating completion portion. A plane that includes the layer direction refers to a plane that bisects the volume of the flow path of the molten material from the inlet of the lamination unit up to the stacking completion unit.) In the cross section including, stacked in the stacking device The angle α formed by the wall surface forming the flow path of the molten material and the central axis in each part from the completed part to the widthwise widened part entrance is −85 ° or more and + 15 ° or less (the angle α is An apparatus for producing a laminated film, characterized in that the direction in which the flow of the molten material is reduced is minus, the direction in which it is widened is plus, and the direction parallel to the central axis is 0 ° . The value of t2 / t1 is 0.02 or more and 2 or less, where t1 is a dimension in the stacking direction of the stacking completion portion in the flow path of the molten material, and t2 is a dimension in the stacking direction of the entrance of the widened portion in the width direction. The manufacturing apparatus of the laminated film of Claim 1 characterized by the above-mentioned. The t2 / t1 value is 0.2 or more and 1.05 or less, where t1 is the stacking direction dimension of the stacking completion portion in the molten material flow path, and t2 is the stacking direction dimension of the widthwise widened portion entrance. The manufacturing apparatus of the laminated | multilayer film of Claim 1 characterized by the above-mentioned. The apparatus for producing a laminated film according to any one of claims 1 to 3, wherein t3 ≦ t1 and t3 ≦ t2 when the dimension in the lamination direction of the slit gap is t3. The value of A2 / A1, where A1 is the area of the cross section orthogonal to the central axis of the flow path of the stacking completion part, and A2 is the area of the cross section orthogonal to the central axis of the flow path of the widened portion entrance Is 0.8 or more and 1.2 or less, The manufacturing apparatus of the laminated film in any one of Claims 1-4 characterized by the above-mentioned. When the circumferential length of the cross section orthogonal to the central axis of the flow path of the stacking completion portion is L1, and the peripheral length of the cross section orthogonal to the central axis of the flow path of the widened width portion entrance is L2, L2 / L1 The value of is 0.8 or more and 1.2 or less, The manufacturing apparatus of the laminated film in any one of Claims 1-5 characterized by the above-mentioned. A plurality of molten materials are supplied to the laminated film manufacturing apparatus according to any one of claims 1 to 6, and each molten material laminated from the slit gap of the laminated film manufacturing apparatus is extruded, cooled and solidified. A method for producing a laminated film, comprising forming a laminated film.

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