JP5976473B2 - Multi-layer strip manufacturing equipment - Google Patents

Description

The present invention relates to a production equipment of the multilayer strip.

  For example, like a laminator line, cast film line, and sheet forming line, multiple types of film (or sheet-like) molten materials are merged and extruded while being drawn from an extrusion die to produce a multi-layer strip (manufactured object) ) Is used in many fields.

  The width of the multilayer strip extruded from the extrusion die is generally narrower than the extrusion width, and the film thickness at both ends in the width direction of the multilayer strip is thicker than the film thickness at the center. This phenomenon is called the so-called neck-in phenomenon, and the forming of both ends in the width direction of the multilayer strip becomes unstable, which causes film fluctuations and film width fluctuations. Sometimes.

  Therefore, in Patent Document 1, as the resin for molding both ends in the width direction of the resin film, a resin having a higher “extension viscosity” or a resin having a lower “MFR” than the resin at the center in the width direction is used. Is disclosed.

JP 2002-240126 A

  However, joining materials having different physical properties at the end with respect to the central portion in the width direction in this way generates molten resin at both ends in addition to the original extruder that generates molten resin at the central portion. This means that the equipment of the extruder needs to be “prepared separately”, and there is a problem that the cost increases greatly.

  The present invention has been made in view of such conventional situations and problems, and it is an object of the present invention to obtain a manufacturing apparatus for a multilayer strip that is less likely to cause a problem of film separation at the end in the width direction at a low cost. It is said.

The present invention relates to a multilayer structure in which a plurality of types of molten materials extruded in a molten state by a plurality of extruders are joined in a laminating direction to form a laminate, and the laminate is stretch-molded to produce a multilayer strip. The apparatus for manufacturing a strip-shaped body includes a joining portion that joins the molten materials to form the laminated body, and the laminated body is formed by branching a part of the plurality of types of molten materials into the joining portion. Forming a side flow path leading to an end in the width direction, and the merging portion has a pedestal block having a recess, and an attachment block that is shaped to correspond to the recess and is detachably assembled to the pedestal block; The pedestal block and the attachment block
The above-mentioned problem is solved by forming a flow path for the molten material .

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing apparatus of the multilayer strip | belt-shaped body which is hard to produce the problem of the film separation of the edge part of the width direction can be obtained at low cost.

1 is an exploded perspective view (including a partially enlarged perspective view of a part) of a laminated body forming assembly in an example of an embodiment of an apparatus for producing a multilayer strip according to the present invention. The perspective view which assembled the laminated body formation assembly of FIG. The perspective view which shows the joining state of the resin in the manufacturing apparatus of FIG. Sectional drawing which showed typically the variation of the width direction cross section (cross section seen from the arrow IV direction of FIG. 3) of the multilayer strip manufactured in the said manufacturing apparatus.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is an exploded view (including a partially enlarged perspective view of a part) of a laminated body forming assembly 14 in a manufacturing apparatus 12 for a multilayer strip (laminated film in this embodiment) according to an example of an embodiment of the present invention. FIG. 2 is a perspective view of the laminated body forming assembly 14 in an assembled state.

  The laminated body forming assembly 14 joins three types (plural types) of molten resins (molten materials) A, B, and C extruded in a molten state by three unillustrated extruders in the stacking direction, and has a predetermined thickness. The laminated body 40 (see FIG. 3: described later) is formed. Thereafter, the laminated body 40 is stretch-molded to a predetermined thickness by the extrusion die attachment 18 and a roller (not shown), thereby forming a multilayer belt-like body (not shown) that is a manufacturing object. Of the molten resins A, B, and C in this embodiment, the most moldable material is the molten resin A.

  The laminated body forming assembly 14 according to this embodiment mainly includes an inflow unit 22, a stacking order control unit 24, a merging unit 26, and an outflow unit 28.

  The inflow unit 22 includes three inflow ports 22A to 22C that respectively receive three types of molten resins A, B, and C that have been extruded from the extruder.

  In the stacking order control unit 24, the flow paths of the molten resins A, B, and C are formed so that the three types of molten resins A, B, and C that have flowed into the inflow unit 22 are in a predetermined arrangement. In this embodiment, the stacking sequence control unit 24 includes a pedestal block 24A and a stacking sequence conversion block 24B that is detachable from the pedestal block 24A. Accordingly, the stacking order can be arbitrarily changed by changing only the stacking order conversion block 24B.

  The merging unit 26 constitutes the “merging portion J” of the multilayer strip manufacturing apparatus 12 according to the present embodiment, and includes a pedestal block 26A and an attachment block 26B that is detachably assembled to the pedestal block 26A. It is configured. The merge unit 26 merges the molten materials A, B, and C to form a thick laminate 40. The configuration of the “merging portion J” configured by the merging unit 26 will be described in detail later.

  The outflow unit 28 includes a discharge path 28 </ b> A that sends the laminated body 40 that has flowed out from the merging unit 26 to the extrusion die attachment 18 side.

  The extrusion die attachment 18 is provided in the lower part of the laminate forming assembly 14 and extends the thick laminate 40 into a thin and wide multilayer strip. In addition, a known cooling line (not shown) using an extrusion die (not shown) and a plurality of rollers is attached to the subsequent stage of the extrusion die attachment 18.

  Here, the merging unit 26 constituting the merging portion J will be described more specifically.

  As described above, in this embodiment, the merge unit 26 merges the molten resins A, B, and C to form a thick laminate 40, and includes a pedestal block 26A and an attachment block 26B. ing.

  The pedestal block 26A of the merging unit 26 includes a V-shaped recess 26A1 in which the attachment block 26B is incorporated. The attachment block 26B has a shape corresponding to the recess 26A1 as a whole, and is detachably assembled to the base block 26A.

  The attachment block 26B is integrated with the recess 26A1 of the pedestal block 26A, and has a function of joining the molten resins A, B, and C sent from the stacking order control unit 24 while shaping them into a plate shape. Since it is an attachment type, it is possible to deal with various stacking modes by simply replacing the attachment block 26B.

  In the present embodiment, the confluence unit 26 has a V-shaped recess 26A1 in the base block 26A and an inverted triangle corresponding to the V-shaped attachment block 26B. . However, the merging unit may be any unit as long as it fulfills the function of merging the molten resin. For example, the shape of the recess of the base block may be U-shaped, and the specific shape etc. It is not limited to the shape of the form.

  A joint portion 26A2 is continuously formed below the concave portion 26A1 of the base block 26A. The joined molten resin A, B, C is joined at the joining portion 26A2 to form the laminate 40. The laminated body 40 of this embodiment has three layers (the same applies to a multilayer strip that is a product object).

  As shown in the enlarged view of the main part in the circle of FIG. 1 and FIG. 3, the attachment block 26 </ b> B is the most of the laminated body 40 of the three types of molten resin A, B, C flow paths 50, 52, 54. The flow path 50 of the molten resin A laminated | stacked on the surface side is equipped with the dam part 26B1. This dam portion 26B1 forms a side flow path 50A for branching the flow path 50 of the molten resin A and guiding it to the end of the laminated body 40 in the width direction. That is, the side flow path 50A is such that a part of the flow path 50 of the molten resin A on the outermost surface side of the laminated body 40 is branched and wraps around the ends of the molten resins B and C. The end portion functions so as to be composed of only one type of molten resin A.

  Next, the operation of the multilayer strip manufacturing apparatus 12 will be described.

  Since the multilayer strip according to this embodiment is a three-layer laminate film, first, the molten resins A, B, and C constituting the multilayer strip are melted by three unillustrated extruders. -Generated.

  The three types of molten resins A, B, and C are flowed into the laminated body forming assembly 14 from the three inlets 22A to 22C of the inflow unit 22. The molten resins A, B, and C that have flowed into the stacked body forming assembly 14 are arranged in the stacking order of the multilayer strips to be formed by the stacking order control unit 24. In this example, the molten resin A flows into the front surface side, the molten resin C flows into the back surface side, and the molten resin B flows into the center in the stacking direction because of the characteristics required for the multilayer strip that is the manufacturing object.

  The three types of molten resins A, B, and C arranged in a predetermined stacking order enter the merging unit 26 constituting the merging portion J, where they are merged after being shaped into a plate shape (see FIG. 3). . Among the three types of molten resins A, B, and C, a part of the flow channel 50 of the molten resin A laminated on the most surface side is formed in the side flow channel 50A formed in the merge unit 26 at the stage of this merge. It is branched and guided to the ends of the molten resins B and C, that is, the ends of the laminated body 40 in the width direction.

  As a result, as schematically shown in FIG. 4A, the width direction end of the laminate 40 is constituted only by the molten resin A laminated on the most surface side of the laminate 40. Become. The laminated body 40 formed in this way flows to the outflow unit 28 through the joint portion 26A2 of the base block 26A.

  An extrusion die attachment 18 is provided on the downstream side of the outflow unit 28, and the laminate 40 is thinly stretched and formed here. At this time, the neck-in phenomenon inevitably occurs, but in this embodiment, since the molten resin A having a good moldability is disposed at the end of the laminate 40 in the width direction, the occurrence of the neck-in phenomenon is minimized. Can be suppressed, and good stretching properties can be obtained.

  Further, in this embodiment, the molten resin A (most front side) of the three types of molten resins A, B, and C is extended as it is at the end in the width direction of the laminate 40. Therefore, compared to the case where another resin having different physical properties from any of the three types of molten resins A, B, and C is used for the end portion, the molten resin A, B, C and the end portion (ear portion) in the center in the width direction are used. The film separation from the molten resin A hardly occurs.

  In addition, as the material of the end portion, instead of preparing a separate material, the original material constituting the strip itself is used, so an extruder for generating a molten resin for the end portion is provided. There is no need to prepare separately, and the cost of the manufacturing apparatus can be reduced.

  In the above-described embodiment, the multilayer belt-shaped body has three layers, and the molten resin A located on the most surface side of the laminated body 40 is used as a material that constitutes the widthwise end of the multilayer belt-shaped body. However, in the present invention, the position at which the molten material in the laminate is adopted as the material of the end portion is not particularly limited to this configuration.

  There are several guidelines for selecting the material that forms the end in the width direction.

  The first selection guideline is consideration of stretchability (formability).

  It is preferable to select a material having good stretchability as a material to be disposed at the end portion among a plurality of types of molten materials constituting the multilayer strip. This selection particularly contributes to minimizing the occurrence of the neck-in phenomenon.

  The second selection guideline is consideration of the arrangement position in the stacking direction.

  Preferably, it is preferable to select a material laminated on the most front side or the most back side as a material to be arranged at the end. Thereby, in particular, the occurrence of so-called film separation can be effectively suppressed.

  Note that the configuration that can be most effective when focusing on prevention of film separation is, for example, as shown in FIG. 4B, the molten resin D laminated on the most front side of the laminate 70 and the most back side. It is to adopt what laminated | stacked 2 types of molten materials of the molten resin F laminated | stacked as a raw material of the width direction edge part of the said laminated body 70. FIG. In this configuration, as a result, the material boundary between the central portion 71 and the end portion 72 does not appear at all on the front surface and the back surface of the multilayer belt-like body, so that the film breakage can be prevented almost completely. In addition, when this configuration is adopted, when cutting the width direction end part in post-processing, the width direction dimension before cutting the end part can be made as small as possible with respect to the width direction dimension of the final product. The advantage that can be reduced is also obtained. This is because the boundary between the center portion 71 which is originally a multilayer and the end portion 72 which is only two layers does not appear at least in appearance, so that the appearance of the product can be achieved even if the cutting position is slightly shifted. This is because it does not affect the top. Further, by utilizing the fact that no boundary appears in the end of the multilayer belt, the cutting position is set at the position X1 of the two layers, thereby protecting the molten resin E with the molten resins D and F on the front and back surfaces. It is also possible to maintain the function to be performed even after the end cutting. This configuration is effective when, for example, the internal molten resin E has a property of being easily changed when exposed to air. Thus, the consideration of the arrangement position in the stacking direction greatly affects the selection of the material of the end portion. Further, as is clear from the above description, in the present invention, the material at the end in the width direction does not necessarily need to be one kind of material.

  The third selection guideline is consideration of familiarity characteristics with other materials.

  It is effective to consider the familiar properties with other molten resins from the viewpoint of hardly causing separation of the membrane. That is, it is possible to determine which molten resin is used for the end portion with the selection guideline that is the most familiar combination.

  The fourth selection guideline is economic considerations.

  In particular, when it is difficult to recycle when cut, it is preferable to use a material that is as cheap as possible as the material of the end portion. However, for example, as shown in the example of A of the molten resins A, B, and C in FIG. 4A and the example of I of the molten resins G, H, I, and K in FIG. When “1 type” material is used as the material, it is easy to recycle the cut end. For this reason, the freedom degree of economical choice can be expanded greatly. In other words, by using one type of material at the end, the strip as a product is a “multilayer” and can be easily collected by recycling, even though no special end material is used. become able to. Thereby, for example, even if the material itself is somewhat expensive, it is possible to employ a technique in which the material itself is used at the end in anticipation of good stretchability and recycled after cutting.

  These first to fourth selection guidelines may interfere with each other in the selection. However, the priority order is not particularly limited, and is appropriately set at the end in consideration of individual specific situations. You can select the material to use. In some cases, elements and situations other than the first to fourth guidelines may be considered. Variations are not limited to the above-described FIGS. 4A to 4C. For example, as shown in FIG. 4D, the melt on the most surface side among the melting materials L to P constituting the laminated body 90 is performed. The material L and the inner molten material N may be used in two layers at the end.

  In the present invention, the type of “strip-shaped body” is not particularly limited, and can be applied to any meltable material such as a metal in addition to a resin, and similar effects can be obtained. Further, the number of stacked layers is not limited as long as it is plural (two or more layers). In short, it is sufficient if n ≦ N−1 is satisfied, where N is the number of layers in the center of the laminate and n is the number of layers at the end. N is an integer of 2 or more.

  The present invention can also be regarded as a multilayer strip that satisfies such a condition.

J Junction part 12 Manufacturing apparatus 14 Laminate body assembly 18 Extrusion die attachment 26 Junction unit 26A Base block 26B Attachment block 28 Outflow unit 40 Laminate 50A Side flow path

Claims (6)

Manufacture of a multi-layered belt-shaped body in which a plurality of types of molten materials extruded in a molten state by a plurality of extruders are joined in the laminating direction to form a laminated body, and the multilayer body is stretch-molded to produce a multilayered strip-shaped body In the device
A merging portion for joining the molten materials to form the laminate,
Forming a side flow path that branches a part of the plurality of types of molten materials to the end in the width direction of the laminated body at the joining portion;
The merging portion is composed of a pedestal block having a recess, and an attachment block that is shaped to correspond to the recess and is detachably assembled to the pedestal block ,
An apparatus for producing a multilayer strip , wherein a flow path for the molten material is formed by the pedestal block and the attachment block . In claim 1,
When N is the number of layers in the center in the width direction of the laminate and n is the number of layers at the end, N is an integer equal to or greater than 2 and n ≦ N−1 holds. An apparatus for producing a multi-layered strip as a feature. In claim 1 or 2,
The production of a multilayer strip, wherein the molten material guided to the end portion in the width direction of the laminate through the side flow path is composed of only one of the plurality of types of molten materials. apparatus. In any one of Claims 1-3,
The molten material guided to the end portion in the width direction of the laminate through the side flow path is a molten material that is laminated on the most surface side or the most back surface side of the laminate among the plurality of types of melt materials. An apparatus for producing a multilayer strip characterized by comprising. In any one of Claims 1-3,
The molten material guided to the end portion in the width direction of the stacked body through the side flow path is a molten material other than the molten material stacked on the top surface side and the backmost surface side of the stacked body among the plurality of types of molten materials. An apparatus for producing a multi-layered strip, comprising: In any one of Claims 1, 2, and 4,
The molten material guided to the end portion in the width direction of the stacked body through the side flow path is two types of the plurality of types of molten materials that are stacked on the top surface side and the backmost surface side of the stacked body. An apparatus for producing a multi-layered strip, characterized by comprising:

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