KR0151736B1 - Multilayer blow molding method and apparatus - Google Patents

Abstract

The present invention has different partition areas along at least one of its resin species, number of layers, and layer thicknesses along the molded product cross-sectional circumferential wall, and the least butterfly of the formed partition areas is formed on the molded product cross-sectional circumferential wall in any one resin layer. A method for producing a multilayer blow molded article having a predetermined butterfly, wherein the resin species extending along the molded article longitudinal wall are different partition regions, whereby each partition region exhibits excellent physical properties corresponding to the role of each region of the molded article, An apparatus and such blow molded articles are provided. At this time, the wall thickness ratio of the resin layer is changed along each partition region and the molded article longitudinal section wall, or the multi-layer blow molded article in which the partition width of the partition region in each said resin layer is changed along the molded article longitudinal section wall is produced. To provide a method, an apparatus and a blow molded article as such. The method, the apparatus and the molded article of the present invention are particularly useful as blow molded articles such as bumpers for automobiles, seating places and the like of chairs, doors of boiler rooms and the like.

Description

Multi-layer blow molding method and apparatus

FIG. 1 is a conceptual diagram showing a cross section of a multi-layer flyson obtained by the first multi-layer blow molding method and apparatus according to the first embodiment of the present invention.

2 is a cross-sectional explanatory diagram of a multilayer blow molding apparatus used in carrying out the multilayer blow molding method used in carrying out the first multilayer blow molding rice method.

FIG. 3 is an explanatory diagram showing an extract of the flow of molten resin in the molding apparatus of FIG.

4 and 5 are cross-sectional views taken along line IV-IV and line V-V showing the lotus root portion of Fig. 2, respectively.

FIG. 6 is a cross-sectional explanatory diagram showing a door of a boiler room which is a multilayer blow molded article formed using the apparatus shown in FIG.

FIG. 7 is a cross-sectional explanatory view showing a cross section of a multilayer parison extruded from the apparatus shown in FIG.

8 and 9 are explanatory views for explaining a situation in which blow molding is performed by die-fastening a multilayer parison by a die divided into four molds.

FIG. 10 is a cross-sectional explanatory diagram showing a blind ring in a state where it is applied to the multilayer blow molding apparatus shown in FIG.

FIG. 11 is a private view of the blind ring of FIG.

12 is a plan explanatory diagram showing a modification of the lotus root portion.

FIG. 13 is a cross-sectional explanatory view showing a multilayer parison formed using the lotus root of FIG. 12. FIG.

14 to 17 are cross-sectional explanatory views showing bumpers for automobiles molded using the multilayer blow molding apparatus of the first embodiment.

18 is a cross-sectional explanatory diagram of a multilayer blow molding apparatus used in carrying out the second multilayer blow molding method according to the second embodiment of the present invention.

FIG. 19 is a private facility view showing the cylinder body for forming the flow path of FIG. 18. FIG.

FIG. 20 is an explanatory view showing an extract of the flow of molten resin in the molding apparatus of FIG.

21 to 23 are explanatory views showing a state in which a molten resin flows through a resin distribution pipe having a branching passage and a confluence passage.

24 to 26 are cross-sectional explanatory diagrams showing the multilayer parison obtained by the method and apparatus of Example 2. FIG.

FIG. 27 is a private facility map showing a seating position and a back of a chair formed by using the multilayer parison of Example 2. FIG.

FIG. 28 is a cross-sectional explanatory diagram showing a seating position or a back of the chair of FIG. 27; FIG.

FIG. 29 is a perspective explanatory view showing the appearance of wrinkles due to the curling of the flyson toward the lesser resin flow rate during extrusion of the multilayer flyson. FIG.

30 is an explanatory cross-sectional view showing a multilayer blow molding apparatus for carrying out the third method of the present invention according to the third embodiment.

FIG. 31 is an explanatory diagram schematically illustrated to describe the periphery of the ring-shaped flow path butterfly control valve of FIG. 30.

FIG. 32 is a perspective explanatory view showing a flow path butterfly control valve in the ring form of FIG.

33 and 34 are plan explanatory views for explaining the operating state of the ring-shaped flow path butterfly control valve.

35 is a perspective explanatory diagram showing a multilayer parison obtained by the method and apparatus of Example 3. FIG.

36 is an explanatory diagram showing a cross section of a multilayer parison obtained by the method and apparatus of Example 3. FIG.

FIG. 37 is a cross-sectional explanatory diagram showing a situation in which die fastening a multilayer parison obtained by the method and apparatus of Example 3 with a mold is shown. FIG.

38 is a cross-sectional explanatory diagram showing a multilayer blow molding apparatus for carrying out the fourth method of the present invention according to the fourth embodiment.

39 to 42 are explanations for explaining the mounting state of the flapping nail.

43 is a partial perspective explanatory view showing a fixed state of each of the flow path forming cylinder bodies and the outer flow path forming copper cylinder body constituting the multicylindrical cylindrical flow path forming portion.

44 and 45 are explanatory views for explaining the multiple cylindrical flow path of Example 4. FIG.

45 is an explanatory diagram for explaining the multilayer parison formed in the fourth embodiment.

FIG. 47 is an explanatory diagram for explaining a situation of changing the segmentation butterfly in the angular section by the flapping nail.

48 is an explanatory diagram for generally explaining a multilayer parison extruded by the fourth method and apparatus of the present invention.

49-52 is a partial cross-sectional explanatory drawing for demonstrating the multilayer parison obtained by the conventional method.

* Explanation of symbols for main parts of the drawings

1: multi-torus part 2: lotus root part

3: Oct Pass Part 4: Nozzle Part

5: bolt 6: mold

9. blind ring

The present invention relates to a novel multilayer blow molding method, an apparatus for carrying out the method and a hollow molded article obtained by the method. More specifically, a multilayer for molding a hollow molded article having a multilayered structure having at least two layers or more in the wall thickness direction and having at least two layers or more different resin regions along the circumferential wall in any one layer constituting the multilayered structure. The present invention relates to a blow molding method, a multilayer blow molding apparatus used to carry out the method, and a hollow molded article molded by the method.

Background Art Conventionally, various proposals have been made regarding a method and apparatus for manufacturing a blow molded article having a plurality of layers made of different kinds of thermoplastic resins by blow molding, or a blow molded article obtained, and specifically, a multi-layered Parison formed. In the form of), the following is mentioned.

That is, in the special publications 52-37,026 and the special publications 57-53,175, for example, as shown in FIG. 49, a resin layer formed concentrically by resin species A and B in the cross-sectional shape, respectively ( And the multilayer thickness P of the resin layer 1, 2 having a uniform shape in its entirety, ie, in the axial direction (discharge direction during extrusion) and the circumferential direction. It is disclosed and blow molding of a gasoline tank of an automobile, a container of mayonnaise, a cappuccine, etc. which are consumed in an automobile by carrying out multilayer blow molding using such multilayer Parison P is actually performed.

In addition, Japanese Patent Laid-Open Nos. 62-138,227 and 2-13,908 are called thickening multi-layer blow systems. For example, as shown in Fig. 50, the resin species are the same as in the case of Fig. 49 above. A resin layer (1, 2) formed concentrically by A and C, respectively, and between each resin layer (1, 2) a resin layer (B) by another resin species B in a predetermined region in the parison axial direction ( A multilayer parison P with 3) is disclosed, and it is described that such a multilayer parison P is blow-molded to mainly form a gasoline tank of an automobile.

In addition, Japanese Patent Application Laid-Open Nos. 63-101,512 and 63-106,984 disclose the connection blow method. As shown in FIG. 51, for example, resin species A, as shown in FIG. Multilayered parison P which has resin layers 1 and 2 formed concentrically by B, and whose wall thickness ratios of these resin layers 1 and 2 are changed along the parison axial direction, is disclosed. The blow molding of the multilayer Parison P is mainly carried out to form intake ducts mainly disposed in the engine compartment of an automobile. In FIG. 51, the wall thickness of the resin layer 1 is thicker than the wall thickness of the resin layer 2 at the upper and lower ends of the flyson, and the wall thickness of the resin layer 2 is the resin layer 1 at the center portion. Although the example of the multilayered fliesson thicker than the wall thickness is shown, the pattern of the change of the wall thickness of the resin layer is of course not limited to this.

Also, Japanese Patent Application Laid-Open No. 2-15,373 and the like describe a blow molding method called an X-change blow method, and the purpose of forming intake ducts mainly installed in the engine compartment of an automobile is the same as in the case of FIG. For example, as shown in FIG. 52, multilayer Parison P formed by sequentially changing resin species A, resin species B, and resin species A at one end thereof in the parison axial direction is disclosed. .

In addition, Japanese Patent Application Laid-Open No. 3-57,020, which relates to the invention of one of the inventors of the present invention, has a two-layer structure in which two kinds of resins are laminated in a single side plate in which the parison is vertically split along the axial direction at the center of the cross section. A multilayer parison is disclosed in which the other half is made of one type of resin, and the layer parison is equalized over the entire length of the parison axial direction, and a container for carrying various articles is provided. It is described as being suitable for molding. However, in the Parison having such a layer structure, as described later, the Parison, which is deformed to the single layer side by the squeeze from the die head, is rounded up, and as shown in FIG. none. In addition, this method is an extremely unusual method of blow molding using a mold divided into seven parts, and the molded article is also limited to a very special one having a deep double wall structure. There is a problem that application is impossible in the case of blow molding. Furthermore, this publication discloses practically no specific method and mechanism for forming such multilayer parison.

By the way, the physical property of the blow molded article obtained by blow molding mainly depends on the characteristics of the thermoplastic resin used there. For this reason, according to the use of a molded article, a use place, etc., this molded article is extremely important at the point of improving the different quality in each area | region of the part part.

For example, in the case of an automobile bumper, the facer portion must be beautiful in appearance, and the beam portion is required to be strong enough to withstand the impact caused by the impact or the like. In addition, in the case of the seat and the registration stand of the chair, since the part on the surface side is a part directly contacted by a person, it is required that the material is rich in elasticity and has a soft and soft skin texture, and furthermore, As for the part on the back side, it is necessary to support the weight of the person who is fixed to an ear such as the legs of the chair, so that it is essential to have excellent strength and rigidity. In addition, in the case of a door of a boiler room, since the surface side is exposed to the outside, it is required to be excellent in appearance, and the back side shields the atmosphere which is full of high temperature steam and steam, and the oil droplet is floating, and heat resistance, Hot water resistance, oil resistance, and the like are required, and since the upper and lower sections are opened and closed in contact with a rail provided in a door silt or lintel, excellent friction resistance and heat resistance are required. For this reason, according to the role which each part part has, and the physical property requested | required by the part part in these molded articles, it is preferable to select resin suitable to satisfy these, and to shape | mold the whole integrally.

In the case of producing such a molded article by the blow molding method, it is not possible to respond to the multilayered flyson by merely multilayering it in the wall thickness direction, and to form a plurality of divided regions having different resin species in the flyson circumferential direction. In addition, the multilayering in the parison wall thickness direction and the division by the dissimilar resin in the parison circumferential direction are necessary.

However, in the above-described conventional multilayer blow molding method, even if multilayering in the parison wall thickness direction is possible, it is impossible to partition by heterogeneous resin in the parison circumferential direction, and according to the role of the partial part of the hollow molded article, These molded articles could not be molded using a plurality of resins having physical properties.

For this reason, conventionally, for an automobile bumper, for example, there is no method other than manufacturing the facer section and the beam section as separate parts, and manufacturing them as a part can reduce costs. There was a problem that there was not. In addition, there is no method other than forming the part on the front side and the part on the back side separately, and then assembling it to manufacture the part where the seat and the back of the chair are leaning, and can be manufactured integrally in a single process. Since there was no manufacturing cost, there was also a problem in terms of strength.

Accordingly, it is an object of the present invention to have different compartments with respect to any one or more of their resin species, number of layers and layer thicknesses along the perimeter cross section of the molded article, the least butterfly of which is in the formed compartment region, In which the resin species extending along the molded product longitudinal section wall have at least one eighth of their periphery in the peripheral wall of the molded article, and the resin species extend along the longitudinal section wall, and each partition region corresponds to the respective role of each region that the blow molded article should have. The present invention provides a method, an apparatus for manufacturing a multilayer blow molded article, and such a blow molded article.

Further, another object of the present invention is to have a partition area that is different from each other with respect to any one or more of the main species, the number of layers, and the layer thickness along the molded product cross-sectional peripheral wall, and at the same time, the wall thickness ratio of the resin layer in each partitioned area. The present invention provides a multi-layer blow molded article that changes along a molded article longitudinal section wall and the change in wall thickness along each of the partition zones and the molded article longitudinal section walls corresponds to the respective role of each region that the blow molded article should have.

In addition, another object of the present invention is, for example, in a hollow molded article such as a bumper for a car, a seating position of a chair, a back of a chair, a door of a boiler room, etc., and they have a plurality of partition areas different in resin species, It is to provide a multi-layer blow molded article corresponding to the respective role of each zone that each of the compartments should have a blow molded article as a product.

That is, firstly, the present invention forms a multi-layered parasitic through which the plurality of thermoplastic resins are cylindrically extruded from the die head, and the entire wall thickness is substantially uniform, and the overall wall thickness thereof is substantially uniform. In the case of guiding the flyson into a plurality of divided molds in which the flyson can be accepted and blow molding by die-fastening the die, the resin species along the circumferential direction of the flyson with respect to the multilayer flyson At least one of the number of layers and the thickness of the layers, and at least one of the minimum widths of the formed partitions has a partition width of 45 ° or more in the circumferential direction of the flyson in the resin layer. The multilayer blow molding rice method is characterized in that the resin species extending in the parison axial direction are different partition regions.

In this method, the outermost layer of the multilayer parison is a layer which firstly determines a partition region having different resin species, and the mold is divided into a plurality of mold structures corresponding to the partition region having different resin species. In blow molding by die fastening, the boundary portions of the partitioned regions having different resin species are cut by the joined portions of the respective mold structures, and the boundary lines of the divided regions having different resin species are aligned along the ridge lines of the molded articles. In this way, it is possible to reliably prevent the boundary line of the partition area from which the resin species differ from the ridge line of each part of the molded article to damage the aesthetics.

In the multilayer blow molding apparatus for carrying out this first method, a plurality of thermoplastic resins are cylindrically extruded from a die head to form a multilayer over the entire circumference thereof, and a multilayer fly having a substantially uniform wall thickness. A device is formed by forming a hand and guiding the extruded multilayer parison into a mold in an open state capable of accepting the parison, and die-fastening the die to perform blow molding. The die head is a compression device. A multi-torus portion which expands a plurality of molten resins extruded from the concentric ring-shaped flow path, and a flow path for forming a partition region where resin species differ from each other along the circumferential circumferential direction of each resin layer constituting the multilayer parison. Octot part which forms the flow path which connects the lotus root part which comprises this part, and the said multi-torus part and a lotus root part. And a nozzle portion located below the lotus root portion for discharging the multilayer parison, wherein the number of resin species used during extrusion of the Paris parison is m (but an integer of 8≥m≥2) and extruded. The division area formed along the circumferential direction of the parisson with respect to said multilayer parisson with respect to said at least one of the resin species, the number of layers, and the layer thickness with respect to the said multilayer parisson. The multi-torus portion has a flow path for spreading the molten resin introduced from m inlets into a concentric ring of m weight when the number of ps is p (an integer of p≥2), and the lotus root portion is each molten resin. Is a m-type n-layer p-distribution pattern which has a predetermined flow path, and the molten resin in which the oct path portion is expanded from a multi-torus portion to a m-weighted concentric ring-shaped flow path has a lotus root portion according to the resin species. Partitioned m The flow path leading to the pattern flow path of the vertical n-layer p-compartment can be configured as the same device.

In the multi-layer blow molding apparatus, the multi-torus portion, the lotus root portion, the oct path portion, and the nozzle portion constituting the die head are each composed of independent parts, and each of these parts can be easily disassembled and assembled. Accordingly, various types of shapes can be selected for the lotus root portion, and the resin species of the molten resin supplied to the multi-torus portion and the number thereof are appropriately selected. The multilayer parison which has a laminated constitution is formed, and it can use suitably for the use requested | required with various hollow molded articles.

In this multilayer blow molding apparatus, the m 'type n' layer p 'is formed by using a die head for discharging the multilayer fly-son of the p-compartment of the n-type m layer (in this case, an integer of n≥3 or more). Used when forming a multilayer parison of compartments (where m 'n' and p 'are all two or more and integers satisfying the conditions of m≥m', n≥n 'and p≥p') With respect to the lotus root portion, the same multi-torus portion, lotus root portion, oct path portion, and the like are prepared by preparing a detachable blind ring for closing the n-n 'sufficient flow path bottom opening from the outside of the n-layer pattern flow path. By using the die head provided with the nozzle part, a multilayer parison with fewer layers can be formed, and a multi-layer blow molding apparatus can be constructed for multipurpose use.

Therefore, according to the multi-layer blow molding apparatus configured as described above, a plurality of thermoplastic synthetic resins, each of which are separately melted, are joined in the die head portion, and the normal circular or elliptical shape of the nozzle portion located at the tip of the die head, or the fitting of a circular arc and a straight line, or the like. Through the slits having the shape of a circle deformed, extruded multilayered parisons having various patterns of resin species m, number of layers n, and parison circumferential partitions p, and a plurality of hollow molded articles having different resin species in these multilayered parisons It is possible to produce a variety of multi-layer blow molded articles having a partition region of which the resin constituting each of the partition regions exhibits physical properties according to the role that each region plays in the hollow molded article.

That is, the multi-layer blow molded article molded by such a first method and apparatus is a plurality of thermoplastic resins cylindrically extruded from the die head and formed on the entire circumference thereof so as to be multi-layered and substantially uniform in overall wall thickness. A hollow molded article is formed by forming one multilayer flyson and blow molding the multilayer flyson, and the hollow molded article is different from each other with respect to any one or more of the resin species, the number of layers, and the layer thickness along the peripheral wall of the molded article. At least one of the molded compartments, wherein at least one of the molded compartments has at least one eighth of their periphery at their periphery in the cross section of the molded article in the resin layer and differs in resin species extending along the molded article longitudinal section wall; Area, and each partition area has a structure corresponding to each role of each area that the blow molded article should have have.

For this reason, the multilayer blow molded article molded by this method and apparatus has, for example, a bumper for automobiles, and in order to impart beautiful physical properties to the facer portion corresponding to the outer surface thereof, for example, ABS resin or the like. For example, PP-GF resin or the like may be used to select a resin of the resin and to impart a property that the beam portion corresponding to the inside thereof can withstand impacts such as a collision and also be inexpensive. It is good to choose. As another example, for the same thing as the door of a boiler room, the surface side selects resin, such as ABS resin which is excellent in an external appearance, and the back side PPS-GF resin which is excellent in heat resistance, oil resistance, and hot water resistance, etc. It is preferable to select a resin such as POM resin which is excellent in wear resistance, heat resistance, and the like for the portion of the upper and lower cross-sections.

Secondly, in the present invention, a m-type (but integer of m≥2) thermoplastic resin is compressed in a die head to form a multilayer parison, and the extruded multilayer parison is divided into a plurality of parisons. P into a mold in an open state that can accept the die and die-tightening the mold to carry out blow molding, having a partition butterfly of a predetermined angle in the flyson circumferential direction and having different resin species extending in the flyson axis direction. A multilayer parison, which has a partition region (but an integer of p≥2) and is the number of layers n of each partition region (where n is an integer of 1 or more and the number of layers of any one or more partition regions is 2 or more). The first partition is n ₁ , the second compartment is n ₂ ..., the p compartment is n _p , and the maximum number of layers is n _k layers of the k compartment, respectively. When (1≤k≤p), the die head corresponds to the maximum number of layers nk A flow path of a number of molten resins is formed, and in a partition area other than the k-th section, any one of resins forming the partition area is flowed into a plurality of flow paths so that the molten resin flows in the entire number of flow paths corresponding to the maximum layer number nk. It is a multilayer blow molding method which has the characteristic that it flows and forms the multilayer parison which is substantially uniform in the whole wall thickness irrespective of the difference of the number of layers n in each division area.

In this multi-layer blow molding rice method, according to the experiments of the present inventors, for example, the partition butterfly as disclosed in Japanese Patent Application Laid-Open No. 3-57,020 has 180 ° and two partition regions (partition number p = 2) equal to each other. In the case where a multi-layer blow molding is carried out by forming a multilayer parison, one of which is a plural partition region composed of a plurality of resin layers and the other partition region is a single-layer partition region composed of a single resin layer, In general, the resin flow rate of the molten resin flowing through the multilayer partition region side is higher than the resin flow rate of the molten resin flowing through the single layer compartment region side, and thus the multilayer flyson formed is squashed and squashed to the side with the low resin flow rate, and molding is performed. It is easy to be impossible, but in this case, even in the fault zone, the fault zone and the same number of flow paths Is the flow rate of the molten resin flowing through the multilayer compartment and apparently the monolayer compartment region by flowing molten resin so that it may be a single layer in appearance but is actually a multilayer formed by the same resin, and substantially equalize the entire wall thickness of the formed multilayer flyson. It is possible to maintain the balance of, thereby preventing the occurrence of such a situation as described above. According to the experiments of the present inventors, the total flow rate of the molten resin flowing to the multilayer compartment region is in the range of 0.7 to 1.3 weight times, preferably 0.8 to 1.2 weight times, more preferably the flow rate of the melt resin flowing to the monolayer compartment region. Preferably, the thickness is adjusted in the range of 0.9 to 1.1 times by weight, and thus, in the multilayer Parish formed by adjusting the resin flow rate of the molten resin in this way, the total wall thickness irrespective of the difference in the number of layers n in each partition area. Can be made substantially uniform.

The multi-layer blow molding apparatus for carrying out this second method extrudes a plurality of thermoplastic resins in a cylindrical shape from the die head to form a multilayer parison with a substantially uniform wall thickness thereof, and the extruded multilayer It is a device that divides the parison into a plurality of divided molds and accepts the parison, and die-fastens the mold to perform blow molding. m (wherein an integer of 8≥m≥2), and the number of extruded multilayer parisons is n (wherein n is an integer of 1 or more, and the number of layers of any one or more compartments is 2 or more). The die head when the number of partition regions formed along the circumferential direction of p is about p (two integers) with respect to any one or more of the resin species, the number of layers, and the wall thickness of the multilayer parison. Of the number corresponding to n A nozzle for discharging a multi-layer flyson mounted on a lower end of a multi-cylindrical flow path forming portion formed by assembling a common flow-forming cylinder body into a multi-cylinder shape and woven into an outer flow-path forming cylinder body. The outer wall surface of the said flow path forming cylinder body is comprised, and the flow path of a molten resin corresponds with the inner wall surface of the flow path formation cylinder body corresponding to the partition number p of each resin layer formed, and adjacent to the outer side. As a device in which a groove portion is formed, and at least a tip portion of an extrusion device corresponding to the number m of the resin species and an upper end of each flow path formed in the multi-cylindrical flow path forming portion are connected by a resin distribution pipe. Can be configured.

In this multilayer blow molding apparatus, the number of extrusion apparatuses is equal to the number m of resin species, and at least one branch passage and at least one confluence passage are provided in the resin distribution pipe, and either of these branch passages or confluence passages is provided. Or it is good to provide a flow path switching valve both. In this way, a branch channel and a confluence path are provided in the resin distribution pipe, and the resin distribution pipe flows from the flow path switching valve to control the molten resin supplied to the multi-cylindrical flow path forming portion at the tip of the extrusion apparatus. It is possible to change the number m, the number of layers n, and the number of divisions p of the resin layer of the multi-layer flyson to be formed without requiring time, such as exchanging related parts, and to prepare a multi-layer flyson of various patterns required for various blow-molded articles. Can be.

Therefore, according to the second multi-layer blow molding method and apparatus thereof, as in the case of the first method and apparatus, a plurality of thermoplastic synthetic resins that are separately heated and melted are respectively joined in the die head portion, and the die Through the slits of the nozzle portion located at the head end, a multilayer flyson having various patterns of the number m of resin species, the number of layers n and the parison circumferential partition number p is extruded, and the hollow molded product is formed from the resin paper. It is possible to produce a variety of multilayer blow molded articles having a plurality of different partition zones, and the resin constituting each of the partition zones exhibiting physical properties according to the role of each zone in the hollow molded article.

Particularly preferred that blow molding is possible with this second method and apparatus are chairs and various tables where the seating area and / or the back are leaned from a hollow molded article made of thermoplastic resin. Specifically, the number of layers of the resin constituting the surface side to nf, and that if the number of the outermost exposed the number of layers of the resin constituting the side when a n _b at the same time the n _f ≠ n _b in the outer resin layer is the front side and If there is divided into two areas that make up the side, these will is formed of a respective divided area a plurality of resin are different from each other, preferably in the stories of the resin n _f is 3 constituting the front surface side, a further back side Number of floors of the resin constituting n _b is apparently 1 of thermoplastic resin is a chair and a table.

As for the chair, in the seating area and / or the back, the outermost resin layer exposed to the outer surface of the three resin layers on the surface side and in direct contact with the human body has a bending modulus of at least 5,000 kg f / cm 2. And a hard resin having a Rockwell hardness of 60 or more, and the resin layer constituting the rear surface side is preferably formed of the same hard resin as the resin constituting the inner resin layer on the front surface side. In terms of the table, the outermost resin layer exposed on the outer surface of the three resin layers on the surface side is formed of ABS resin, the intermediate resin layer is formed of adhesive resin, and the inner resin layer is an olefin elastomer. It is preferable that it is formed of resin, and the resin layer which comprises the back surface side is formed of resin of the same system as resin which comprises the inner layer of the said surface side. Particularly preferred is a chair or table made of a thermoplastic resin molded in this way, for example, a chair installed in an electronic airplane or a theater having an openable and simple table stored on the back of the back.

Third, the present invention is a cylindrical extrusion of a plurality of thermoplastic resins in the die head to form a multilayer parison with substantially uniform wall thickness, and the extruded multilayer parison is divided into a plurality of flies. In blow molding by guiding the mold into an open mold that can accept a hand, and die-tightening the mold, any of the resin species, the number of layers, and the wall thickness of the multilayer flyson is oriented along the circumferential direction of the flyson. It is a multi-layer blow molding method in which different partition regions are formed with respect to one or more, and the wall thickness ratio of the resin layer in each partitioned partition region is changed along the flyson discharge direction.

In the multilayer blow molding method as described above, the multilayer parison has at least two outermost layers and an innermost layer of two resin layers whose wall thicknesses change in two partition regions and in the flyson discharge direction. The wall thickness ratio of the innermost layer and the outermost layer of the one partitioned area in the cross section at any position in the axial direction is r ₁ , and the wall thickness ratio of the innermost layer and the outermost layer of the other partitioned area is in once to r _2, while each variation of these r ₁ and r ₂ to the wall thickness that is approximately one product of the ratio r ₁ and r ₂ it is recommended to discharge the multi-layer parison.

The multi-layer blow molding apparatus for carrying out the third method is a multi-layer blow molding apparatus for carrying out the second method, wherein the multi-cylindrical flow path forming portion has two partition butterflies having 180 ° and equal to each other. A partition area (partition number p = 2) is formed and divided into a plurality of flow path parts for forming a multi-cylindrical flow path forming part and a resin confluence part for joining a plurality of resins flowing down the multi-flow path part. And between the multiple flow path portions and the resin confluence portion, it is located below each flow path of the multiple flow path portions, and reciprocates in a direction orthogonal to the flow direction of the molten resin. Ring-shaped flow path butterfly valves are provided to change the wall thickness ratio of the resin layer in each partition region along the fly-sone discharge direction. Since the stand is configured.

Therefore, according to the multilayer blow molding apparatus configured as described above, a plurality of thermoplastic resins are cylindrically extruded from the die head to form a multilayer parison with a substantially uniform wall thickness, and the multilayer parison is formed by blow molding. A hollow molded article, wherein one of the resin species, the number of layers, and the layer thickness has a partition region different from each other with respect to at least one along the molded article cross-sectional perimeter wall, and the resin layer in each partition region partitioned. The multi-layer blows in which the wall thickness ratios of the micrometers vary along the longitudinal section walls of the molded part, and the wall thickness ratio changes along the respective partition zones and the molded longitudinal section walls correspond to the respective regions and wall thickness ratios of the hollow molded part. Molded articles can be produced.

Therefore, similarly to the case of the method and apparatus of the third multilayer blow molding, a multilayer fly-son having various patterns of the number m of resin species, the number of layers n and the number of parison circumferential sections is extruded, and the multilayer fly In addition to being able to produce a variety of multi-layer blow molded parts at hand, by operating a flow path butterfly valve disposed within the die head, the wall thickness ratios of the innermost and outermost layers along the parison axial direction with respect to each compartment area can be achieved. It becomes possible to change, and it is possible to produce blow molded articles having a pattern of significant change in physical properties in the part of the blow molded article. Moreover, since the wall thickness ratio can be changed along the parison axial direction in this way, when a plurality of cavities are provided in the mold in the vertical direction, respectively, and blow molding a plurality of hollow molded products simultaneously in one multilayer fly hand, The directions of the cavities can be installed in alternating symmetrical positional relationship, whereby the die tightening force can be applied uniformly to the entire mold when the die is tightened and blow-molded, and the workability of the blow molding is remarkably. Improve.

In the fourth aspect of the present invention, a plurality of thermoplastic resins are cylindrically extruded from a die head to form a multilayer parison, whose overall wall thickness is substantially uniform, and the extruded multilayer parison is divided into a plurality. In blow molding by guiding the mold into an open mold capable of accepting flyson, and die-tightening the die, the delamination is performed along the circumferential direction of the at least one resin layer constituting the multilayer flyson. A multi-layer blow molding method is provided in which different partition regions are formed with respect to any one or more of the resin species, the number of layers, and the layer thickness, and the partition width of each partitioned partition region is changed along the flyson ejection direction.

In the multi-layer blow molding method, in forming a multi-layered flyson of m type, n-layer, and p-compartment, the pattern of change along the flyson discharge direction of the partition butterfly in the temporary partition area is determined by one of the following methods. It is preferable to form so that a resin layer may mutually differ. By forming the multilayer parison in this manner, for example, when the molded article is a polyhedron whose shape is surrounded by a curved line having a complex curve, the resin forming the parison is required. There is an advantage that it can meet such a demand by selecting to be suitable for the physical properties requiring the kind.

In the multi-layer blow molding apparatus for carrying out the fourth method, in the multi-layer blow molding apparatus for carrying out the second method, a multi-channel which forms a multi-cylindrical flow path with respect to the multi-cylindrical flow path forming portion. Section and a resin joining section for joining the plurality of resins flowing down the multiple flow path sections, and the partition width in the circumferential direction of the parison circumference of each partition region in each resin layer is changed between the multiple flow path sections and the resin joining sections. A compartment butterfly control unit is provided, and the compartment butterfly control unit is mounted on a substantially hemispherical rod-shaped hemisphere shell portion corresponding to the number n of layers and swings on the spherical outer surface of these hemisphere shell portions. The multi-layered parison is formed at a position corresponding to the lower end of the partition wall forming the boundary of each partition region formed in the multi-channel part. It consists of a tongue-like flapping nail that changes the partition width of each partition area, and the partition bow of each partition area partitioned in each resin layer changes in the flyson discharge direction. It can be configured by making it possible to form.

Further, the partition butterfly control unit provided between the multiple flow path portion and the resin confluence portion may be formed integrally with the multiple flow passage portion or the resin confluence portion side, or may be formed separately from these multiple flow passage portions and the resin confluence portion. have.

Therefore, according to the multilayer blow molding apparatus configured as described above, a plurality of thermoplastic resins are cylindrically extruded from the die head to form a multilayer parison with a substantially uniform wall thickness, and the multilayer parison is blow molded to blow A molded article can be formed, and the blow molded article has a partition area different from each other with respect to any one or more of its resin species, the number of layers, and the layer thickness along the circumferential wall of the molded article, and at the same time The compartment bow is changing along the molded article longitudinal wall, and each compartment is a multi-layer blow molded article corresponding to the role of each region that the hollow molded article should have.

Therefore, according to this fourth multi-layer blow molding method and apparatus, similarly to the case of the first method and apparatus, it has various patterns of the number m of resin species, the number of layers n and the number of parison circumferential sections p. Extrude the multilayer parison and produce various multilayer blow molded articles from the multilayer parison, and change the parcel butterfly along the parison axial direction with respect to each parcel area by the parcel butterfly control unit respectively installed in the die head. It is possible to produce a blow molded article having a pattern of remarkable physical property change in both the cross-sectional direction and the longitudinal cross-sectional direction of the hollow molded article, and according to the use, it is possible to produce the performance of the resin such as heat resistance, water resistance, heat insulation, sound insulation, abrasion resistance, etc. It can be sufficiently pulled out from a part of the molded article, and the product performance of the blow molded article can be easily improved.

Based on the Example shown to an accompanying drawing below, the multilayer blow molding method of this invention, its apparatus, and the hollow molded article obtained by this method are demonstrated concretely.

Example 1

This Example 1 relates to the first multilayer blow molding method of the present invention, the apparatus and the hollow molded article obtained by the method, and the cross-sectional shape of the multilayer flyson P ₁ obtained by the method and the apparatus is shown in FIG. Conceptually represented. The multi-layer parison P ₁ are the different types of resin R _1, R ₂ ..... R _m the use, in a direction to be a plurality of parison wall thickness layers L _1, L ₂ and L ..... _n At the same time, a plurality of partition regions S ₁ , S ₂ ..... S _p are formed in the circumferential direction of the Parison circumference, and m, n, and p compartments (where m is the number of resin species, n: number of layers, p: number of partition regions in the circumferential direction of the parison circumferential direction). In FIG. 1, the cross section is divided into p sections, the maximum number of layers in each section is n layers, and the maximum number m of resin species is combined within a range of n or less. In addition, in this FIG. 1, multi-layer parison in a uniform thickness over the entire cross-section around the circumferential direction of P _1. However, any one or two or more if necessary divided area S _1, S ₂ ..... S _p in is also possible to change the thickness, but also and that can change the number n of the resin layer L _1, L ₂ ..... L _n in each gwihoek area S _1, S ₂ ..... S _p in, Condensed resin layers L ₁ , L ₂ ..... L _n are formed over the entire circumferential circumference of the parison, and the necessary number of divisions in each resin layer L ₁ , L ₂ ..... L _n The areas S ₁ , SL ₂ ..... S _p may be formed.

In this way, all of the partition regions S ₁ , SL ₂ ..... S _p formed along the circumferential circumferential direction are circumferential directions in any one resin layer L ₁ , L ₂ ..... L _n . Therefore, it is necessary to have a compartment of an angle of at least 45 ° or more and the resin species extending in the fly axial direction are different from each other. Thus, when one of the compartments is blown by die-fastening the flyson into a mold, There is an advantage that the mold dies out of the mold cavity and the parison portion of the compartment does not constitute any part of the blow molded article at all.

Fig. 2 shows a cross-sectional explanatory diagram of the multilayer blow molding apparatus used in carrying out the first multilayer blow molding method, and Fig. 3 shows the flow of molten resin of the molding apparatus. One explanatory diagram is shown.

This molding apparatus basically flows five kinds of molten resins A, B, C, D and E extruded from five extruders in which the die head H is not shown through the resin introduction passage 1b. The lotus root part 2 which comprises the multi-torus part 1 extended by (1a), the flow path 2a for forming the division area | region which mutually differs resin type along each resin which comprises a multilayer parison, and these The molten resins A, B, C, D, and E, which are connected between the multi-torus portion 1 and the lotus root 2 and developed in the five concentric annular flow paths 1a in the multi-torus portion 1, An oct-pass portion 3 for forming a flow path 3a guiding in a direction to a pattern flow path 2a of m, n-layer, and p-compartments partitioned by the lotus root part 2 according to the resin species; Located below the lotus root part 2, and passes through the pattern flow path 2a of the m type, n-layer, and p compartment of the lotus root part 2, and It consists of the molten resin A, B, C, D and E joined in a room with a nozzle portion (4) having a slit (4a) which discharges a multi-layer parison having a cylindrical shape P1.

In the first embodiment, the lotus root portion 2 is a cross-sectional view taken along the IV-IV line and V-V line cross-sectional view of FIG. 2 as shown in FIGS. 4 and 5 (in contrast, in FIG. The cross section of the lotus root portion is a cross-sectional view taken along line II-II of FIGS. 4 and 5), and a plurality of arc-like and slit-like flow paths 2a through which molten resin flows, of which each flow path is located on the same circumference ( 2a) There are two kinds of bridge portions 2b and 2c connecting the ends.

That is, the bridge portion 2b is provided for the purpose of merely mechanically connecting the lotus root portion 2 forming the plurality of arc-shaped and slit-like flow paths 2a to each part so as not to be scattered. Is formed in the flow paths 2a of the resins A and E. In order to reduce the trace of the resin flow path segmentation by the bridge portion 2b in the molded article, the butterfly is as narrow as possible and the length is as short as possible. Therefore, in FIG. 5, the V-V section of FIG. 2, this bridge portion 2b does not already exist. The bridge portion 2c on the other hand essentially prevents the flow of resin, and is provided in the flow paths 2a of the resins B, C, and D in FIG. 2, and is indicated by broken lines in FIG. Likewise, it is developed in an arc shape so that the flow of resin can be prevented reliably, and the length thereof also extends to approximately the entire length of the longitudinal length of the lotus root portion 2 as shown in FIG.

Further, reference numeral 29 denotes a parison controller shaft driven by the hydraulic cylinder 30. The die core 4b of the nozzle unit 4 is moved up and down while the parison controller shaft 29 is moved up and down. The slits 4a of the die from which the multilayer flyson is discharged can be adjusted.

In Example 1, the multi-torus portion (`), the lotus root portion (2), the oct-pass portion (3) and the nozzle portion (4) constituting the die head H are each composed of independent parts that can be disassembled and assembled. The bolt 5a and the nozzle portion 4 connecting the octopath portion 3 and connecting the multi-torus portion 1 and the lotus root portion 2 to the lotus root portion 2; The whole is integrally assembled with the bolt 5b. Therefore, according to the multilayer blow molding apparatus of Example 1, various shapes including the lotus root portion 2 and, in some cases, the oct pass portion 3 are prepared, and m, n, and p compartments are prepared. according to the lotus root portion 2 and the case of a multi-layer parison is required in forming P ₁ having a layer structure is selected a oct-path section 3 and bokcheul parison to match the desired this to the die head H P ₁ formed This makes it possible to appropriately respond to the required use for various blow molded articles.

For Example 1, a multilayer blow molded article as G _1, having a structure as shown in Figure 6 also tried to blow molding the door of the boiler chamber having a high-performance, such as thermal insulation, thermal insulation, sound insulation.

In other words, resin A, which is the structural base material of the door, has a very good blow moldability, a relatively high level of strength, and economical glass fiber reinforced polypropylene (PP-GF), and high temperature steam, steam and oil. As a resin that forms the inner surface of a door that is directly exposed to an atmosphere containing droplets, glass fiber reinforced polypropylene sulfide (PPS-GF), which is excellent in heat resistance, hot water resistance, chemical resistance and oil resistance, is used again. Resin C, which forms the outer surface of the door to be exposed, uses acrylonitrile-butadiene-styrene copolymer (ABS) having a smooth, beautiful surface and excellent gloss, and forms upper and lower cross-sections of the door in contact with the door rail. As resin D, polyacetal (POM), which is excellent in friction resistance, surface activity, and the like, is used, and is also in contact with each other as resin E positioned between two kinds of resins. Using an adhesive resin capable of adhering the hard resin chakhagi each other, in the extrusion device (not shown) through the die head H shown in FIG. 2 multi-layer parison P ₁ was extruded. The extruded multilayer parison P ₁ has five types (resin A, B, C, D and E), three layers (inner layer, intermediate layer, outer layer), four compartments (45 in outer layer) as shown in the cross section in FIG. Two compartments of resin D having a compartment butterfly of °, a compartment of resin B having a compartment of 135 ° and a compartment of resin C having a compartment of 135 °.

Next, a multi-layered parison using a mold provided respectively just below the die head H with respect to the P ₁ was blow-molding the multi-layer blow-molded products G1 (the door of the boiler chamber) in accordance with a conventional method. The mold 6 used at this time is divided | segmented into four metal mold | die structures 6a, 6b, and 6c corresponding to four division area | regions from which the said resin species differ, as shown in FIG. 8 and FIG. And blow-molding 6b and 6c to cut the boundary portion 8 of the partition region where the resin species differ from each other by the fitting portions 7 of the respective mold bodies 6a, 6b and 6c. Therefore, along the ridge line of the molded article, the resin species are made to coincide with the boundary lines of the different partition regions. The multilayer blow molded article G1 thus formed has a length of at least 1/8 or more of the circumference of the circumferential wall of the molded article cross section of the two partitioned regions of the resin D constituting the upper and lower cross sections. In addition, in the case of a mold divided into two constituents of right and left, as in a conventional mold for blow molding, the recess on the upper surface side of the peripheral wall of the molded product cross section becomes an undercut that inhibits the die opening operation of the lateral mold constituents. In the case of the metal mold | die 6 of FIG. 8 and FIG. 9, by die-tightening the metal mold | die 6 divided | segmented into four structures as mentioned above, it can prevent that the undercut to the opening-and-closing direction is prevented.

FIG. 10 is a die blower for discharging a multilayer fly-son of a p-compartment of m-type and n-layer (in this case, an integer greater than or equal to 3) in the multilayer blow molding apparatus shown in FIG. M 'species, n' layers, and p 'compartments (where m', n 'and p' are any two or more, and integers satisfying the conditions of m≥m ', nn' and p≥p ') Removable blind ring 9 for closing the bottom opening of the flow path of the n-n 'layer on the outside of the pattern flow path 2a with the n-layer portion with respect to the lotus root portion used when forming the multilayer parison. The prepared example is shown, and this blind ring 9 has the shape as shown in FIG. Of course, the shape of the blind ring 9 is not limited to that shown in Fig. 11, but may be any one that can close the lower end of the flow path for the n-n 'layer outside the pattern flow path 2a. Even if it is a top, it may also be a circular arc. By using such a blind ring 9, the multi-torus portion 1, the lotus root portion 2, and the oct pass portion 3 of the die head H can be extruded in advance in order to extrude a large number of layers n multi-layer parison P ₁ . and a prepared release can easily form a multi-layer parison P ₁ of less stories n, it is possible to configure the blow molding apparatus for multi-purpose use.

12 shows a modified example of the lotus root portion 2, wherein the lotus root portion 2 is formed in three concentric circles with semicircular arcs with the center line 0 as the boundary, and thus the pattern flow passage 2a. As shown in FIG. 13, up to 5 types, 3 layers, and 2 compartments (equivalent compartments of 180 ° to the left and right) are formed by exchanging with 5 kinds of molten resins in exchange with the lotus root portion of FIG. Multilayer parison P ₁ )) can be extruded. In addition, this lotus root part 2 is used, and in one partition area, only one so-called single side which formed the external single resin layer which consists of any one of these 3 types of resins is a double layer, and the other half is an external single layer. The flyson can also be easily formed, and at this time, the same resin can be flown to all of the three flow paths 2a forming the partition area on the single-layer side in appearance, so that the wall thickness of the entire multilayer flyson can be made uniform.

In addition, in Example 1, as shown in FIG. 3, the arrangement of the concentric annular flow paths 1a in the multi-rotor portion 1 is aligned from the inner side to the outer side so as to match the layer configuration in the lotus root portion 2. Although the flow path 3a of the oct path part 3 is formed, it is not specifically limited, For example, the molten resin C which flows through the outermost flow path 1a in the multi-lotus part 1 is a lotus root part. You may connect through the oct path part 3 so that it may lead to the outermost flow path 2a of (2). In addition, the oct-pass section 3 is of a different type, for example, some of the flow paths 1a of the multi-lotus section 1 are closed, and only the lotus root section ( Even if one having the flow path 3a connected to the pattern flow path 2a of 2) is prepared, the molten resin having a small resin type m may be distributed into several partition regions, S ₁ , S ₂ ..... S _p . good.

Next, FIGS. 14 to 17 show a bumper G ₂ for automobiles of a multilayer blow molded article having various cross-sectional shapes formed by using the multilayer blow molding apparatus of the first embodiment.

The bumper G ₂ for automobiles of FIG. 14 serves as a bumper structural member, forms a hollow rib so as to absorb a shock during a collision, and shows a beam portion 10 that exhibits excellent strength and rigidity, and the beam portion 10 of the beam portion 10. It is composed of a facer portion 11 that fills the entire front surface and forms a front outer surface and directly contacts the human eye. In this embodiment, the beam portion 10 is made of PP-GF resin, and the facer portion 11 is made of ABS resin. In addition, the bumper G ₂ for automobiles of FIG. 15 has an adhesive resin layer 12 for adhering between the beam portion 10 of the bumper structural member and the facer portion 11 constituting the front outer surface thereof. In the present invention, multi-layer blow molding was performed using a so-called three-layer, three-layer, two-part, multi-layered parison, and the adhesion between the beam portion 10 and the facer portion 11 was further strengthened. Further, the bumper G ₂ for showing a 16-degree, will form a resin layer 13 made of a recycled resin in the interior of the bumper structure bujaeui beam 10, it is one to effectively reusing the recycled resin. In addition, the bumper G ₂ for automobiles of FIG. 17 is a device having the structure of FIG. 16 interposed with an adhesive resin layer 12, and can be multi-layer blow-molded by using a so-called four-layer, four-layer, two-part multi-layer flyson. have.

In this manner, the automobile bumper G ₂ , which is multilayer blow-molded, can significantly reduce its production cost, and the whole part is formed integrally with the multilayer blower, so that the facer part 11 exposed to human eyes and using expensive resin is required. Since the wall thickness can be made as thin as possible, and the amount of the expensive resin used can be greatly reduced, the product cost can be significantly reduced. Moreover, it becomes possible to use recycle resin in the part which does not reach human eyes, such as the inside of the beam part 10, and exhibits the industrially outstanding effect.

Example 2

This Example 2 relates to the second multilayer blow molding method of the present invention, an apparatus thereof, and a blow molded article obtained by the method.

In the multilayer blow molding apparatus for carrying out this second method, as shown in Figs. 18 and 19, basically, the number of resin species used in the compression of the multilayer parison P ₂ is m (where, m> 2, and the number of extruded multilayer parison P ₂ is n (wherein n is an integer of 1 or more, and the number of layers of any one or more compartments is 2 or more), and the multilayer parison of the resin species, the number and layers one or more different divided area with respect to each other in the thickness with respect to P ₂ number of divided area is formed so as to have along the parison in the circumferential direction P (However, an integer from P≥2) once, The multi-cylindrical flow path forming portion 20 formed by combining the die head H in the number of cylindrical flow path forming cylinder bodies 20d corresponding to the number of layers n (n = 3 in the second embodiment) and the multiple It is comprised by the nozzle part 21 attached to the lower end of the cylindrical flow path formation part _2, and discharges the multilayer fly-on P2. In addition, the outer wall of each of the flow path forming cylinders 20a, 20b, and 20c corresponds to the number of partitions P of each resin layer (in this embodiment 2, P = 2 and 180 ° of the partition butterfly). And the grooves 23 constituting the flow paths 22a, 22b and 22c of the molten resin together with the inner wall surfaces of the flow path-type cylinder bodies 20b and 20c and the outer shell flow path forming cylinder body 20d adjacent to the outside thereof. ) Is formed, and at least the tip of an unillustrated extrusion apparatus corresponding to the number m of the resin species and the upper end of each of the flow passages 22a, 22b, 22c formed in the multi-cylindrical flow path forming portion 20; Is connected to the resin distribution pipes 24a, 24b, 24c, 24d, 24e, and 24f, and this is expressed as shown in FIG.

In the second embodiment, the number of layers is 3 and the number of partitions is 2, so that up to six types of resins A, B, C, D, E, and F can be supplied. It is possible to form a partition region having. And each resin distribution pipe 24a, 24b, 24c, 24d, 24e, 24f connected to the front-end | tip part of an extrusion apparatus, as shown in FIG. 21 and FIG. 22, respectively has one branch 25 and One confluence passage 26 is provided, and flow path switching valves 27 are provided in both of the branch passages 25 and the confluence passages 26, respectively. The flow path switching valve 27 provided in the branch passage 25 and the oil passage 26 of each resin distribution pipe 24a, 24b, 24c, 24d, 24e, 24f is, for example, as shown in FIG. Likewise, the melted resin supplied to the two flow paths 22b of the multi-cylindrical flow path forming part 20 can be controlled through the resin distribution pipes 24c and 24d at the tip end of the extrusion apparatus. That is, in FIG. 22, the situation where two types of resins C and D are switched by the flow path switching valve 27 and supplied to the flow path 22b on the opposite side, respectively, is shown in FIG. The situation where the resin C is supplied from only the equity piping 24c, is distributed to the left and right by the branch path 25, and the same resin C is supplied to the two flow paths 22b as a whole through the mixing path 26 is illustrated. Therefore, the flow path formed by the cylinder body 20b for forming one flow path by adopting the resin distribution pipes 24a, 24b, 24c, 24d, 24e, and 24f having such a branch passage 25 and the mixing passage 26 is adopted. By the operation of the flow path switching valve 27, a combination of four types of resins (C, D), (D, C), (C, C), and (D, D) is possible. And, since it is the same as it is possible for the entire flow path (22a, 22b and 22c), for example multi-layer parison of a layer structure of the pattern P ₂ which can form need not use all of the 6 kinds of resins is not large. Therefore, first, the number and type of resins to be used are determined in accordance with the required physical properties, and then the most suitable one is selected from among the layered patterns of the multi-layered parison P ₂ that can be formed next, and the flow path switching valve 27 By setting), a hollow molded article of a desired specification can be obtained. At this time, the parts in the die head H need not be replaced at all.

In FIG. 18, part 28 is a bolt used when combining and fixing three flow path forming cylinder bodies 20a, 20b, and 20c into the outer flow path forming cylinder body 20d. Denotes a flyson controller shaft driven by the hydraulic cylinder 30, and while the flyson controller shaft 29 is moved up and down, the die core 21a of the nozzle portion 21 is moved up and down to discharge the multilayer flyson. The gap between dies can be adjusted.

Multi-layer parison obtained by the method and apparatus of Example 2 P ₂ are, for deulmyeo six kinds (R ₁ ~R _6, A~F resin) layer 3 (L ₁ ~L ₃₎ 2 compartments (S _1, S If a multi-layer structure of _{Fig. 2),} and the 24-degree cross-sectional shape as shown in, can be freely changed separately between the n number of floors in the two divided area S ₁ and S ₂ 1~3 channel.

According to the method and apparatus of the second embodiment, as shown in FIG. 25, the partitioned area S ₁ is composed of an apparent single-layered partitioned area made of a single resin A, and the partitioned area S ₂ is formed of three kinds of resins A. , B, can be prepared in a multi-layer divided area having a three-layer multi-layer parison P ₂ consisting of C. And, such a multi-layer parison P ₂ is, specifically, is suitable for molding a place G4 is expected to sit where G ₃ and the like of the chair, such as shown in Fig. 27 and 28 degrees. That is, in the seating G ₃ and the back G ₄ , the surface side exposed to the outer surface and in direct contact with the human body is composed of a multilayer partition area S ₂ having three resin layers A, B, and C, The resin B of the outer resin layer is made of a soft resin having a bending elastic modulus of 80 or less, for example, an elastomer, having softness, good skin contact, and non-slip, and resin A of the inner resin layer has a bending elastic modulus of 10,000 kgf / It is formed of a hard resin having an excellent strength and rigidity of, for example, cm 2 or more and Rockwell hardness of 60 or more, for example, polypropylene (PP), and in the middle of bonding between the resin layer B on the outside and the resin layer A on the inside. The resin layer is composed of the adhesive resin C, and the resin layer A constituting the back side is formed of the same hard resin as that described above, for example, PP because it can support a human body weight.

Here, according to the experiments of the present inventors, in the multilayer fly-on P ₂ shown in FIG. 25, the total flow rate of the molten resin flowing to the multilayer compartment region S ₂ is the apparent flow rate of the molten resin flowing to the monolayer compartment region S ₁ . It is good to adjust in the range of 0.7-1.3 weight times, Preferably it is 0.8-1.2 weight times, More preferably, it is the range of 0.9-1.1 weight times. For example, as shown in FIG. 26, when the resin A on the single-layer partition area S ₁ side flows into only a single flow path and is literally (really) monolith, and the balance of the flow rate of this molten resin is out of the above range, the die head As shown in FIG. 29, the multilayer parison P ₂ extruded from the nozzle portion 21 of H is shrunk and rounded toward the side having a smaller resin flow rate (in this case, the single-layer partition region S ₁ side). It occurs, and the molding impossible occurs. In the multilayer fly-son formed by controlling the total flow rate of the molten resin flowing to the multilayer partition area S ₂ and the flow rate of the melt resin apparently flowing to the single layer partition area S ₁ , the difference between the number of layers n in each partition area is determined. Regardless, the overall wall thickness can be made substantially uniform.

Example 3

The third embodiment relates to the third multilayer blow molding method, the apparatus and the hollow molded article obtained by the method.

The multilayer blow molding apparatus for implementing this third method is basically the same as the multilayer blow molding apparatus for implementing the second method shown in FIG. 18, as shown in FIGS. 30 and 31. In addition, it has the following features. That is, in the die head H, two cylindrical zones (partition number P = 2) are formed in the multi-cylindrical flow path forming section 20 in the same manner as in the second embodiment, having a partition butterfly of 180 ° and mutually equal. The multi-cylindrical flow path forming section 20 assembles the three cylindrical flow path forming cylinders 20e, 20f, and 20g and the outer shell flow path forming cylinder body 20h into a multi-cylinder shape, and It is divided into the multiple flow path part 20x which forms the cylindrical flow paths 22a, 22b, and 22c, and the resin confluence part 20y which joins several resin which flowed down this multiple flow path part 20x, and these multiple Between the flow path part 20x and the resin confluence part 20y, it is located below each flow path 22a, 22b, 22c of the said multiple flow path part 20x, and can reciprocate in the direction orthogonal to the direction which a molten resin flows. In addition, the lower end opening widths of the respective flow paths 22a, 22b, and 22c are changed so as to A ring-shaped flow path butterfly control valve 31 for varying the thickness of the resin layer along the flyson discharge direction is provided therebetween.

In Figs. 30 and 31, reference numerals 21, 28, 29, and 30 denote nozzle parts and three flow path-forming cylinder bodies 20e, 20f, and 20g, respectively, as in the case of the second embodiment. ) Is a bolt fly-on controller shaft and a hydraulic cylinder used in combination with the outer channel forming cylinder body 20n for fixing.

In the third embodiment, the flow path butterfly control valve 31 is provided with two link portions 31a, which are provided in concentric circles and connected to each other at predetermined positions, as shown in FIG. 31c), and these link portions 31a and 31c are provided with inclined surfaces 33 abutting the seat 32 formed at the lower end of the flow path forming cylinder bodies 20f and 20g. And this flow path butterfly control valve 31 is connected with the hydraulic cylinders 34 provided in the both sides of the movement direction, and as shown in FIG. 33 and FIG. 34 by these hydraulic cylinders 34, It moves so as to move left and right, and when it moves to either side, the lower end opening butterfly in the partition area of one side of the flow path 22a, 22c of the said multiple flow path part 20x is narrowed, and the opposite side, respectively. The lower end opening butterfly in the compartment area of the other side is made wider, the lower end opening butterfly in the former compartment area of the other flow path is made wider, and the lower end opening butterfly in the latter compartment area is made narrower. That is, 33 degrees In passage butterfly control valve 31 is moved to the divided area S ₁ of one side to the stroke end and, at this time, the divided area S ₁ side of the outer charge (35a) and the other divided area of the S in The layer thickness of the inner side layer 36b on the _two sides is the maximum, and the layer thickness of the inner layer 35b on the side of the partition region S ₁ and the outer layer 36a on the side of the partition region S ₂ is minimum. Similarly, there is In flow butterfly control valve 31 in FIG. 3 is moved to the S ₂ divided area on the other side to the stroke end, where the outer layer of the first contrast to the case 3 degrees divided area S ₁ side (35a) with a layer thickness of the inner layer (36b) on the other side of the divided area S ₂ side, and is a minimum, and dividing the area S ₁ side of the inner layer (35b) and a divided area S ₂ side of the outer layer (36a of the Layer thickness is maximum. 33 and 34, reference numeral 38 denotes a hydraulic pipe for operating the pair of hydraulic cylinders 34, and reference numeral 40 denotes a vector indicating a moving direction and moving butterfly of the flow path butterfly control valve 31. to be.

Therefore, in this Example 3 In, 35 as shown in Fig., Multi-layer parison P3 formed has a charge and configuration of a three-kind three-layer second portion, and the two divided area S _1, S _2, the The wall thicknesses of the outer layers 35a and 36a and the inner layers 35b and 36b are changed into the upper portion 37a and the lower portion 37bs along the flyson discharge direction at the boundary of the central portion thereof in the axial direction. In addition, the wall thickness t ₁ of the inner layer 35b of the one partitioned area S ₁ in the cross section at any one position in the axial direction of the multi-layer flyson P ₃ and the wall thickness of the outer worm 35a. a t1 the non-wall thickness between t ₂ and also if the ratio wall thickness between t2 and the other divided area S2 of the wall thickness of the inner layer (36b) to t1 and the wall thickness of the outer layer (36a) to r _2, the These r ₁ and r ₂ are respectively changed so that the product of the wall thicknesses r ₁ and r ₂ is approximately 1.

Therefore, according to the method and apparatus of this Example 3, the number of resin species and the number of layers n are the same as in the case of the methods and apparatuses of Examples 1 and 2, and the number of partitions P in the circumferential direction is two different. of having a pattern extruding a multi-layer parison P _3, and in the multi-layer parison P _3, as well as be able to produce a number of multi-layer blow-molded article, standing because operating the flow path butterfly control valves disposed respectively in the die head, and each divided area With respect to S ₁ and S ₂ , it is possible to change the wall thickness ratios of the innermost layer and the outermost layer along the parison axial direction, and it is possible to produce blow molded articles having a pattern of remarkable physical property change in a part of the hollow molded article. In addition, at this time, since the wall thickness ratio can be changed along the parison axial direction, when a plurality of cavities are provided in the mold in the vertical direction, respectively, and blow molding a plurality of blow-molded articles simultaneously in one multilayer parison The direction of each cavity can be installed in mutually symmetrical positional relationship. Accordingly, the die tightening force can be applied uniformly to the entire mold when blow molding by die tightening the mold. Improve.

For example, in the case where the seating area and the back of the chair shown in FIGS. 27 and 28 of the second embodiment are molded, as shown in FIGS. 36 and 37, the die head H The relationship between the two partition regions of the innermost layer and the outermost wall thickness ratio in the cross section of the multilayer parison P3 extruded from the nozzle portion 21 is the opposite between the upper portion 37a and the lower portion 37b. In addition, the two upper and lower cavities 39a and 39b formed in the mold 39 are provided in symmetrical positional relations facing each other in the opposite direction, and accordingly die fastening each mold half. At the time of blow molding, the die clamping force is applied uniformly to the entire mold 39.

Example 4

This Example 4 relates to the fourth multilayer blow molding method of the present invention, the apparatus and the hollow molded article obtained by this method.

The multilayer blow molding apparatus for implementing this fourth method is basically the same as the multilayer blow molding apparatus for implementing the second method shown in FIG. 18, as shown in FIGS. 38 and 39. In addition, it has the following features. That is, in the die head H, the multi-cylindrical flow path forming unit 20 assembles three cylindrical flow-path forming cylinders 20i, 20j, and 20k into each other in a multi-cylinder shape and forms a cylindrical body for forming an outer flow path (20 m). Is divided into a multi-channel flow section 20x for combining the multi-cylindrical flow paths 22a, 22b and 22c and a resin confluence section 20y for joining a plurality of resins flowing down the multi-channel flow path 20x. The division flow control part 41 which changes the division butterfly of the parison circumferential direction of each division area in each resin layer between these multiple flow path parts 20x and the resin joining part 20y is the said multiple flow path part ( 20x) is integrally installed. The partition butterfly control section 41 is a hemispherical bar portion having a substantially hemispherical shape formed integrally with a lower end of each of the flow path forming cylinders 20i, 20j, and 20k and the outer flow path forming cylinder body 20m. (42a, 42b, 42c, 42d) and swingably mounted on the outer surfaces of the hemispheres of the hemisphere shell portions 42a and 42c, and constitute a boundary of each partition region formed in the multi-channel portion 20x. It is provided at a position corresponding to the bottom of the partition wall, and is composed of tongue-like flapping nails 43a and 43c for varying the partition width of each partition region of the formed multilayer flyson, and partitioned of each partition region in each resin layer. It is possible to form a multi-layer flyson in which the segmented butterfly changes along the flyson discharge direction.

In the fourth embodiment, the hemispherical shell portions 42a, 42b, 42c, and 42d constituting the compartment butterfly control section 41 and tongue-like flapping nails 43a mounted on the hemisphere outer surface so as to be able to swing. The relationship with 43c) is shown in Fig. 39 showing the hemisphere shell portion 42d positioned at the outermost side, the hemisphere shell portion 42d positioned at the inner side thereof, and the flapping nail 43d mounted on the spherical outer surface thereof. It is shown typically. In the flapping nails 43a and 43c, as shown in Figs. 40, 41, and 42, which represent the flapping nail 43d as a representative, the flapping nail 43d is provided. A drive shaft 45 is connected to a drive device 44 (shown in FIG. 38) for driving, and the drive shaft 45 has a torque shaft 45a for transmitting a rotational motion to the flapping nail 43d. ) And a support pipe 45b which is screw-fitted to the flaking nail 43c and is formed in a cylinder shape to hold the torque shaft 45a from the outside thereof, and these torque shafts 45a and the support pipe 45b. ) And a pin 45c for integrally coupling the < RTI ID = 0.0 > The upper and lower surfaces of the flapping nails 43a and 43c are spherical inner surfaces of the hemispherical shell portions 42b and 42d positioned outside thereof, and spherical outer surfaces of the hemisphere shell portions 42a and 42c positioned inside thereof. It is formed in each sphere so as to follow. Moreover, as shown in FIG. 43, an arch-shaped high is formed in the upper part of each flow path forming cylinder body 20i, 20j, 20k and the outer shell flow path forming cylinder body which comprise the multiple cylindrical flow path forming part 20. As shown in FIG. The tops 46i, 46j, 46k, 46m are formed, and each flow path forming cylinder body 20i, 20j, 20k is formed by bolts 28 passing through these fixing parts 46i, 46j, 46k, 46m. The shaft 30a of the hydraulic cylinder 30 which is fixed concentrically in the outer cylinder flow path forming cylinder body 20m and attached to the outer cylinder flow path forming cylinder body 20m is the flow path forming cylinder body 20i. It is fixed to the upper end of the parison controller shaft 29 penetrating the inside, and the hydraulic cylinder 30 moves the parison controller shaft 29 up and down, whereby the die core 21a of the nozzle portion 21. It is possible to adjust the interval of the die discharged by the multilayer fly hand by moving the up and down movement.

In the fourth embodiment, the two multiple cylindrical flow paths 22a and 22d shown in FIG. 38 are divided into four partition regions S ₁ , S ₂ , and S ₃ , respectively, as shown in FIGS. 44 through 46. , S ₄ , and the multiple cylindrical flow paths 22a and 22d are continuous at the lower end of the partition wall (not shown) which partitions into the partition areas S ₁ , S ₂ , S ₃ , and S ₄ . Each flapping nail 43a and 43c is provided, respectively. In addition, the partition area is not formed in the other multiple cylindrical flow path 22b. A resin distribution pipe 24a is connected to the two partition regions S ₁ and S3 formed in the multi-cylindrical flow passage 22a for supplying the molten resin A from an extruder outside the city. In another two partition regions S ₂ and S ₄ formed in the flow passage 22a, a resin distribution pipe 24b is connected to supply the molten resin B in an extrusion apparatus not shown, and a multi-cylindrical flow passage ( A resin distribution pipe 24c is connected to supply molten resin C to 22b), and again, not shown in the two partition regions S ₁ , S ₂ , S ₃ formed in the multi-cylindrical flow path 22d. A resin distribution pipe 24d is connected to supply the molten resin D from the extrusion apparatus, and in another two regions S ₂ and S ₄ formed in the multi-cylindrical flow passage 22d, an extrusion apparatus not shown is shown. In order to supply the molten resin E, the resin distribution pipe 24e comes into contact. It belongs. In addition, in FIG. 44, in resin A and resin B which form an inner resin layer, resin which forms the outer resin layer about resin C is more than resin C which forms the outer resin layer. It is necessary to flow above D and Resin E, respectively. The reason is to not interfere with the flow of the resin inside and the flow of the resin outside from the resin distribution pipes 24a, 24b, 24c, 24d, and 24e. That is, for example, when the resin distribution pipes 24a and 24b are lower than the resin distribution pipe 24c, the multiple cylindrical flow paths which are located at the innermost side in the multiple flow paths 20x in the resin distribution pipes 24a and 24b. Resin A and B which flow into 22a must penetrate the layer of resin C which flows down in the multiple cylindrical flow path 22c located in the outer side.

And, Fig. 47, there is a multi-cylindrical flow path (22c) to a flat development in the green blocks. FIG area _{S 1, S 2, S 3} , S ₄ of the compartment butterfly control situation is shown. The four flapping nails 43d provided on the partition wall 47 which partitions the flow path 22c into four are rocked at a predetermined timing and a butterfly, so that these partition regions S ₁ , S ₂ , S ₃ , and S ₄ are separated. You can change the compartment width. In addition, arrow 48 of the figure shows the direction of the flow of molten resins D and E. FIG.

In addition, the 48 degrees, the first is to display the multi-layer parison p ₄ generally being extruded by the method and apparatus of 4, m kinds of n layer p blocks (m: the type, n the number of the resin R: the resin layer L a number, p: a pattern diagram showing an example of the number of flies divided area S of the hand circumferentially) with multi-layer parison showing a situation in which changes in accordance with the direction of the bow of each compartment being Paris hand extrusion P _4.

In addition, in the fourth embodiment, the position of the partition wall which partitions each partition area of the multiple cylindrical flow path 22a, and the position of the partition wall which partitions each partition area of the multiple cylindrical flow path 22d are provided in the same position. Therefore, although the flapping nails 43a and 43c are located on the extension line of the same partition wall, it does not need to do in particular like this, You may shift the mounting position of these flapping nails 43a and 43c from side to side, and at this time The resin layer may be formed to have a partitioned area having different pattern of change from the outer layer side and the inner side to be controlled by performing separate flapping (movement of shaking the neck).

Here, the assembly procedure of the die head H of Example 4 is briefly described as follows.

(1) As shown in FIG. 38, the multiple flow path portion 20x and the division butterfly control portion 41 integrally formed are assembled with the bolds 28 by overlapping each other.

② Next, using a jig, insert and hold each flapping nail 43a, 43c into a gap between the hemispherical shell portions 42a and 42b on a predetermined stick and the hemisphere shell portions 42c and 42d on a stick, respectively. do.

(3) Then, the torque shaft 45a is inserted from the outer side of the bar upper hemisphere shell portion 42d positioned at the outermost side, and the square portions 49 at the ends thereof are formed in square flanks 43a and 43c. It fits in the hole 50, and each flapping nail 43a and 43c is fixed.

(4) In this state, each of the support pipes 45b is inserted from the outside of each of the torque shafts 45a, and the male thread portion 51 formed at the tip thereof is the female thread portion 52 of each flapping nail 43a, 43c. Screw on.

⑤ Thereafter, the pin 45c is struck between the respective torque shafts 45a and the support pipes 45b on the outside thereof, and the pins 45c are integrally coupled to each other to drive the shafts of the flapping nails 43a and 43c. 45).

⑥ Assemble the drive device 44 to the drive shaft 45 of each of the flapping nails 43a and 43c assembled in this way.

(7) After the assembling work of all the flapping nails 43a and 43d is completed in this way, the resin confluence part 20y is attached below the multiple flow path part 20x and the division butterfly control part 41 assembled in said (1).

⑧ Again, the Parison controller shaft 29 is inserted from below on the central axis of the multiple flow path portion 20x, the division butterfly control portion 41, and the resin confluence portion 20y assembled in the above 7, and the upper end thereof is multiplied. It connects to the shaft 30a of the hydraulic cylinder 30 provided in the upper part of the flow-path part 20x.

(9) Finally, the resin distribution pipes 24a, 24b, 24c, 24d, and 24e are connected to predetermined positions of the multiple flow path portions 20x.

Accordingly, with the multilayer blow molding apparatus of this embodiment 4 by extruding a thermoplastic resin of 5 species in the die head H into the cylindrical form the whole wall thickness of the substantially uniform multi-layer parison P _4, the multi-layer Paris Blow molding hand P ₄ can be used to form various blow molded articles. As for these blow molded articles, each of the resin species m, the number of layers n, and the layer thickness has different partition regions S along the periphery of the molded article cross section, and is partitioned in each resin layer. It is possible to produce a multilayer blow molded article in which the section width of the partition region S is changed along the molded article longitudinal section wall. For this reason, blow molded articles having a pattern of remarkable physical property change can be produced in both the cross-sectional direction and the longitudinal cross-sectional direction of the blow-molded article. It can obtain sufficiently in the partial part of and the product performance of a blow molded article can be improved easily.

Claims (20)

Cylindrically extruded a plurality of thermoplastic resins from the die head to form a parison having a multilayer structure and a uniform wall thickness, wherein the multilayer parison is divided into a plurality of components, and the multilayer parison In the blow molding by guiding the mold into the mold in an open state and die-tightening the mold, the above-described layered flyson is formed along the circumferential direction of the flyson, the resin type, the number of layers and the layer thickness. Multi-layer blow molding method characterized by having different partition regions with respect to any one or more of them. The method of claim 1, wherein m kinds of thermoplastic resins are extruded, wherein m is an integer of m ≧ 2; The p-part of the multilayered plies is composed of different kinds of resins extending in the axial direction of the fly-sons with a compartment butterfly of a predetermined center angle in the circumferential direction of the fly-sons, wherein p is 8≥ has partitions of an integer of p ≧ 2, and the number of layers in each partition is n layers (where n is an integer of 1 or more and one or more partitions are 2 or more layers); The number of floors in the first partition area is n ₁ , the number of floors in the second partition area is n ₂ , and the number of floors in the p-compartment area is n _P , and the minimum number of these is nk (1≤k in the k-th partition area). ≤ p), the flow path of the molten resin corresponding to the maximum number of layers n _K is formed in the die head, and in the partition areas other than the k-th partition area described above, among the resins constituting these partition areas. Either one is supplied through the additional flow paths or through the entire number of flow paths corresponding to n _K , so that the wall thickness of the Parish of the multilayer is kept uniform in all parts irrespective of the number n of layers in each partition area. Multi-layer blow molding method characterized in that. The multi-layer parison has two compartments (partition number p = 2) equal to each other, each having a compartment butterfly of 180 °, wherein one of the two compartments is a plurality of layers. A resin containing a single layer of resin, the other containing a single layer of resin of the same resin, and also in a single layer of a single layer, by supplying a predetermined molten resin through the same number of flow paths as in a multi-layered partition. A multilayer blow molding method, characterized in that the wall thickness of the entire parison is uniform. The multilayer blow molding method according to claim 2 or 3, wherein the partition area of the multilayer is formed of three layers using three kinds of thermoplastic resins. 4. The multilayer according to claim 2 or 3, wherein the total flow rate of the molten resin flowing through the partition region of the multilayer is adjusted to 0.7 to 1.3 weight times the total flow rate of the molten resin flowing through the partition region of the single layer. Blow molding method. The multilayer blow molding method according to claim 1, wherein the wall thickness ratio of the resin layers in each partition region is changed along the extrusion direction of the parison. 7. The fly fly of claim 6, wherein the multi-layer flyson has two compartments and at least two resin layers of the outermost layer and the innermost layer of which the wall thickness ratio changes in the extrusion direction of the flyson. In a cross section at one position in the axial direction of the hand, the ratio of the wall thickness of the innermost layer and the outermost layer in one of the two compartments is equal to r ₁ , in the other compartment. when the maximum ratio of the wall thickness of the inner layer and the outermost layer la r _2, the while a product of the ratio r ₁ and r ₂ to the above-described wall thickness variation of these r ₁ and r ₂ such that approximately one Sikkim extruding a multi-layer parison Multi-layer blow molding method characterized by. The method of claim 1, wherein the width of each compartment is changed along the extrusion direction of the parison during extrusion. The multi-layer fly of the m-type resin-n layer-p-compartment pattern of Claim 8 which changes the width | variety of each division area | region in any one resin layer in a different pattern along the extrusion direction of the said parison. Multi-layer blow molding method characterized by forming a hand. The partition zone according to claim 1, wherein the partition zone having the least butterfly among the partition zones composed of different kinds of resins in one resin layer has a partition width of 45 °; And said partition zones extend in the axial direction of said parison of said multilayer. 11. The method according to claim 10, wherein the parison of the multilayer has partition regions composed of different kinds of resins in the outermost resin layer; The multilayer parison is guided into a mold divided into a plurality of components corresponding to the partition regions; Multi-layer blow molding, characterized in that the mold constructs are in contact with each other, cutting off the boundaries of the compartments made of different kinds of resins, and aligning the boundaries of the remaining compartments along the ridges of the respective parts of the molded article. Way. The multi-layer blow molding method according to claim 4, wherein the total flow rate of the molten resin flowing through the partition region of the multilayer is adjusted to 0.7 to 1.3 weight times the total flow rate of the molten resin flowing through the partition region of the single layer. An apparatus for carrying out the molding method according to claim 1, wherein a plurality of thermoplastic resins are extruded to form a cylindrical parason so that at least one of resin type, number of layers and layer thickness is changed in at least one partition region. Molded toilet comprising the means for. 14. The apparatus of claim 13, further comprising: a multitorus portion for deploying a plurality of molten resins exiting the extruder into concentric ring flow paths; A lotus root constituting flow paths for forming partition regions made of different resins in the circumferential direction of each resin layer of the multi-layer parison; An octopus for forming flow paths connecting the multi-torus portion and the lotus root portion, and a nozzle for extruding the multilayered flyson positioned below the lotus root portion. A number of kinds of resins used in the above-described paraffin extrusion of the multilayer, wherein m is an integer of m≥2; The number of layers in the above-described multilayer parison is n (where n is an integer of n ≧ 2); When p (where p is an integer of 8≥p≥2) is defined as p (where p is an integer of 8≥p≥2) formed in the circumferential direction of the above-mentioned multilayered layer in the circumferential direction of any one or more of resin type, number of layers and layer thickness, The multi-torus portion has flow paths for deploying the molten resin introduced from the m inlets into flow paths on the concentric ring of m-ply, and the lotus root portion contains molten resins of a predetermined m type of resin-n layer-p. Flow paths for dispensing in a pattern of compartments, wherein the oct path portion is used to separate molten resins from the m-ply concentric ring-shaped flow paths in the multi-torus portion, according to the resin type, And a flow path for guiding the flow paths for the pattern of the resin-n layer-p block of the resin. 15. The molding apparatus as claimed in claim 14, wherein the multi-torus portion, the lotus root portion, the oct path portion, and the nozzle portion constitute independent parts of the die head and are disassembleable and assembled. The above-described die head for extruding a multilayered flyson in a m-resin-n-layer-p-compartment (where n is an integer of n≥3) pattern, wherein the m-type is used. Resin-n'layer-p'compartment (wherein m ', n' and p 'are each an integer of 2 or more, m≥m', n≥n 'and p≥p') And a detachable blind ring attached to the lotus root portion to close the lower openings of the flow paths of the n-n 'layer outside the entire flow paths of the n-layer. The method of claim 13, wherein the number of kinds of resins used in the Parisian extrusion of the multilayer is m (wherein m is an integer of m≥2); The number of layers in the above-described multilayer parison is n (where n is an integer of 1 or more and one or more partition regions are 2 or more layers); When p (where p is an integer of 8≥p≥2) is defined as p (where p is an integer of 8≥p≥2) in the circumferential direction of the above-mentioned multilayered flyson, the number of partition regions formed differently with respect to any one or more of the resin type, the number of layers and the layer thickness is n. A multi-cylindrical flow path forming portion consisting of two flow path forming cylinder bodies and a shell body; It includes a die head is mounted to the lower end of the multi-cylindrical flow path forming portion is composed of a nozzle unit for extruding a multi-layer flyson, wherein the flow path forming cylinder body has p grooves on the outer wall surface in each resin layer The grooves constitute flow paths of molten resins together with an inner wall surface of an adjacent outer flow path forming cylinder body, and connect the leading ends of the extruder and the upper end of each flow path formed in the multi-cylindrical flow path forming part. Molding apparatus characterized by comprising a m-type resin distribution pipe. 18. The method according to claim 17, wherein the number of extruders described above is equal to the number m of resin types; At least one branch path and at least one confluence path are provided in the resin distribution pipe, and a flow path switching valve is provided in one or both of the branch paths or confluence paths. 19. The multi-cylindrical flow path forming section according to claim 17 or 18, wherein two partition zones (compartment number p = 2) having a partition butterfly of 180 degrees are formed; The multi-cylindrical flow path forming portion is divided into a multi-flow path portion forming a multi-cylindrical flow path, and a resin confluence portion for joining molten resins flowing down through the multi-flow path portion, wherein the multi-flow path portion and the resin confluence portion and In between, the reciprocating motion is possible in the direction orthogonal to the direction in which the molten resin flows, located below each flow path of the multiple flow path part, and the butterfly of the lower end opening of each flow path is changed to And a ring-shaped flow path butterfly control valve for varying the wall thickness ratio of the resin layer along the flyson extrusion direction. 19. The method according to claim 17 or 18, wherein the multi-cylindrical flow path forming portion is divided into a multi-flow path portion forming a multi-cylindrical flow path and a resin confluence portion for joining molten resins flowing down through the multi-flow path portion. A partition butterfly control section is provided between the multiple flow path section and the resin confluence section to change the section width of the parison circumferential direction of each partition area in each resin layer, and the partition width control section described above corresponds to the number of floors n. A hemispherical bar-shaped hemisphere shell body of which number; Consists of a tongue-like flapping nail movably mounted on the outer surface of each hemisphere shell body at a position corresponding to the lower end of the cliff forming the boundary of each partition region formed in the multi-channel portion, each resin layer And forming the above-mentioned multilayer parison so that the parcel butterfly of each parcel region in E is varied along the extrusion direction of the parison.