JP2012026239A - Artificial thatch-like material and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial thatch-like material which is usable as a substitute of thatch keeping a maintenance cost of a thatched roof low and reducing a risk of fire as well, and which does not damage the atmosphere of the thatch with an appearance very similar to natural thatch, and to provide a method of efficiently manufacturing it.SOLUTION: The artificial thatch-like material R includes: a core part 1 composed of a thermoplastic resin; and an outer layer part 2 composed of the thermoplastic resin with irregular wrinkles 21 formed on the surface. Also, the manufacturing of the artificial thatch-like material R adopts a process including: a first step of forming a rod-like core part 1 and a cylindrical outer layer part 2 by an extrusion molding machine M; a second step of expanding the outer layer part 2 in a balloon shape in outer open space; a third step of forming the irregular wrinkles 21 on the surface by squeezing an expanded outer layer part 3 at the entrance of the die hole Hof a sizing device S; and a fourth step of integrating the core part 1 and the outer layer part 2 by cooling and shaping in the sizing device S.

Description

  INDUSTRIAL APPLICABILITY The present invention is an improvement of an artificial rod, and more specifically, an artificial rod that can be used as a substitute for a rod and has an appearance very close to that of a natural rod and does not impair the atmosphere of the rod. It relates to a typical manufacturing method.

  As is well known, one of the oldest roof structures in Japan is thatched roofs that use firewood materials such as Susuki and Chigaya. Even in modern times, there are cases in which thatched roofs are constructed in private houses for the purpose of leaving Japanese traditional culture and handing down techniques, or for the recent demands of nature-oriented consumers.

  However, when constructing the above-mentioned thatched roof, if natural dredging is used as in the conventional case, the dredging with low durability will be damaged immediately and it will be necessary to replace it at an early stage, which tends to increase the maintenance cost. In addition, natural firewood is very flammable, so there is a great risk of fire.

  Therefore, conventionally, a technique for replacing the above-mentioned flamewood with a resin product that is difficult to burn has been proposed (see Patent Document 1), and by using such a resin product, problems of durability and fire can be solved. However, on the other hand, the resin molded product has a very artificial appearance, and the natural atmosphere of the cocoon is easily damaged.

  On the other hand, in the technical field of resin molding, after extruding a resin material to which a foaming agent has been added from an extruder, the molded body is once expanded with foaming gas in the external space and then compressed again with a sizing device. Thus, a technique for applying a fine grain pattern to the surface of an artificial jar is also known (see Patent Document 2), and it is considered that such a rod-shaped molded body can be used as a substitute for a ridge material to solve the above-mentioned appearance problem. It is done.

  However, since the rod-shaped molded body having the above-mentioned wood grain pattern has a low expansion rate in the external space at the time of molding, it is best to attach a fine linear groove on the peripheral surface of the rod, and the surface of the stem of the cocoon is not satisfactory. The regular pattern could not be expressed. And since the said rod-shaped molded object was a single layer, it was not able to express correctly the cross section of the stalk.

  In addition, although a technique for manufacturing an artificial coral having a modified cross section by a manufacturing method similar to the above-described prior art is also known (see Patent Document 3), this also complicates the cross sectional shape of the rod-shaped molded body. Although it was possible, the pattern of the stem surface and the cross-sectional structure of the stem could not be reproduced.

Japanese Unexamined Patent Publication No. Sho 63-156153 (Pages 1-5, Fig. 1-4) Japanese Examined Patent Publication No. 48-24821 (pages 1-4, Fig. 1-3) Japanese Examined Patent Publication No. 49-41341 (pages 1-6, Fig. 1-6)

  The present invention has been made in view of the above problems, and its purpose is to use it as a substitute for a kite that can reduce the maintenance cost of a thatched roof and also reduce the risk of fire. Another object of the present invention is to provide an artificial rod-like product that can be made and that does not impair the atmosphere of the kite with an appearance very close to that of a natural kite, and an efficient manufacturing method thereof.

  Means employed by the present inventor for solving the above-described problems will be described with reference to the accompanying drawings.

  That is, the present invention is characterized in that the artificial rod-like material R is composed of a core portion 1 made of a thermoplastic resin; and an outer layer portion 2 made of a thermoplastic resin having irregular wrinkles 21 formed on the surface thereof. is there.

  By the way, the above-mentioned “artificial fence R” means a grass plant such as reeds and reeds, or a similar artificial plant such as reed, and is used only for reeds that are roofing materials. It is not intended to limit.

  Further, according to the present invention, if necessary, the thermoplastic resin of the core portion 1 may be made of a crystalline resin that is difficult to hold the foamed gas to increase the amount of foam gas released from the core portion 1 to the outside. it can.

  In the present invention, if necessary, a dye or pigment as a colorant may be added to the thermoplastic resin of the outer layer portion 2 to form a complex shading pattern along the wrinkles 21 on the surface of the outer layer portion 2. .

  On the other hand, in the present invention, if necessary, a white thermoplastic resin can be used for the core portion 1 and a brown thermoplastic resin can be used for the outer layer portion 2 to achieve a screen-like appearance. .

  Moreover, in this invention, the biomass powder which pulverized the plant raw material to the thermoplastic resin of the said outer layer part 2 can be mixed as needed, and the texture or fragrance of a plant can also be added.

  Moreover, in this invention, the vascular bundle of a stem cross section can also be expressed by providing the void part 3 between the core part 1 and the outer layer part 2 as needed.

Further, in the present invention, as a method for efficiently producing the artificial rod-like material R, the rod-shaped core portion 1 is formed from a thermoplastic resin mixed with a foaming agent by an extruder M, and the outside of the core portion 1 is formed. A first step of forming a cylindrical outer layer portion 2 from a thermoplastic resin not containing a foaming agent; in an external open space in which the core portion 1 and the outer layer portion 2 are extruded from the die D of the extruder M A second step of inflating the outer layer portion 2 in a balloon shape by the gas released from the core portion 1; introducing the expanded outer layer portion 2 and the core portion 1 into the die hole H ₃ of the sizing device S; A third step of squeezing the outer layer 3 expanded at the entrance of the die hole H ₃ to form irregular wrinkles 21 on the surface; the core 1 and the outer layer introduced into the die D ′ of the sizing device S; Integrate the two by cooling and shaping A method including the fourth step can be adopted.

  In the present invention, in the first step, the core portion 1 is divided into a plurality of fine cores 11, 11..., And in the third and fourth steps, the fine cores 11, 11. It can be introduced into the die D 'and integrated together, whereby the surface area of the core 1 in the second step can be increased and the amount of foaming gas released can be improved.

  In the present invention, a rod-shaped artificial rod-shaped object is constituted by the core portion and the outer layer portion, and the outer layer portion is ballooned by the foaming gas released from the core portion in the external space extruded from the extruder during molding. By forming it into a shape and pressing it with a sizing device, an irregular and large wrinkle pattern was formed on the surface of the outer layer part, making it possible to express a complex pattern on the surface of the stalk.

  In addition, since the artificial rod-shaped object has a two-layer structure of a core part and an outer layer part, it is possible to faithfully represent the cross-sectional structure of the stem composed of the epidermis and the medulla. It is possible to finish the appearance closer to a real cocoon.

  It should be noted that not all foaming gas is released from the core part to the outside during the molding of the artificial rod-like material, and it is considered that the gas remains in the core part to some extent. Since microbubbles are formed in the core, they can be used to represent medullary tissue with many voids.

  Therefore, according to the present invention, an artificial cage-like product having excellent durability and high practicality that does not impair the atmosphere of natural kites and an efficient production method thereof can be provided. Therefore, the practical utility value of the present invention is very high. .

It is a whole perspective view showing the artificial rod-shaped object in Example 1 of this invention. It is the front view and side view showing the artificial cage in Example 1 of this invention. It is a cross-sectional explanatory drawing of the X-X 'cross section showing the void of the artificial rod-shaped object in Example 1 of this invention. It is process explanatory drawing for demonstrating the manufacturing method of the artificial cage | basket in Example 1 of this invention. It is a cross sectional view of a P ₁ -P ₁ 'cross section and Q ₁ -Q _1' sectional represents the state of the die at the time of manufacture of the artificial Kaya-like material in the first embodiment of the present invention. It is process explanatory drawing for demonstrating the manufacturing method of the artificial cage | basket in Example 3 of this invention. It is a cross sectional view of a P ₂ -P ₂ 'cross section and Q ₂ -Q _2' sectional represents the state of the die at the time of manufacture of the artificial Kaya-like material in Example 3 of the present invention.

“Example 1”
First, a first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a core portion, and what is indicated by reference numeral 2 is an outer layer portion. Also, what is indicated by reference numeral 3 is a void portion.

[Composition of artificial cage]
In this Example 1, the rod-shaped artificial rod-like material R is made of a core 1 made mainly of a thermoplastic resin (material: polypropylene), and a thermoplastic resin (material: polypropylene) is made a main material. The outer layer portion 2 is formed outside (see FIGS. 1 and 2). Further, irregular wrinkles 21 are provided on the surface of the outer layer portion 2.

  In addition, a pigment as a colorant is added to the thermoplastic resin of the outer layer portion 2, and this pigment gathers around the wrinkle 21 and becomes darker than the other portions. A shade pattern is formed. In Example 1, a white thermoplastic resin is used for the core portion 1 and a brown thermoplastic resin is used for the outer layer portion 2.

  By comprising as mentioned above, the surrounding surface and cross section of the artificial cage | basket R can be finished in the external appearance close | similar to a natural cocoon. Specifically, a wrinkle pattern on the surface of the outer layer part 2 can be used to express a hull outer skin pattern, and the two-layer structure of the core part 1 and the outer layer part 2 can reproduce the outer skin and pith of the stem section.

  Further, in Example 1, biomass powder (material: wood flour) obtained by pulverizing plant raw materials is mixed with the thermoplastic resin of the outer layer portion 2 so that the texture and scent of plants are added to the artificial rod-like material R. Can be added.

  In addition, in Example 1, since a void portion 3 is provided between the core portion 1 and the outer layer portion 2 in a part of the artificial cage R, the artificial cage is formed at the portion where the void portion 3 appears. If the material R is cut, a vascular bundle of the stem cross section can also be expressed (see FIG. 3). In addition, by providing the void portion 3, the weight of the artificial cage R can be reduced.

[Manufacturing method of artificial bowl]
Next, a method for manufacturing the artificial cage R will be described. First, as a first step, a rod-shaped core 1 is formed from a thermoplastic resin mixed with a baking soda-based foaming agent using an extruder M, and wood powder, talc, and pigment are formed outside the core 1. A cylindrical outer layer portion 2 is formed from a thermoplastic resin mixed with (see FIGS. 4 and 5).

  Incidentally, in Example 1, the addition amount of the baking soda-based foaming agent in the core 1 is 1 part by weight with respect to 100 parts by weight of the resin. The mixing amount of the wood powder of the outer layer part 2 is about 27 parts by weight with respect to 100 parts by weight of the resin, and the mixing amount of talc is about 24 parts by weight with respect to 100 parts by weight of the resin. In addition, talc is mixed in order to improve the rigidity and formability of the artificial cage.

On the other hand, with respect to the molding temperature of the extrusion molding machine M (die temperature), the core 1 200 ° C., the outer layer 2 and 190 ° C., the size of the die hole H is 6mm in diameter the die hole H ₁ of the core 1, the die hole of H ₂ outer portion 2 has a diameter of 10mm · thickness 1 mm.

  Next, as a second step, the core part 1 and the outer layer part 2 are pushed out from the die D of the extrusion molding machine M, and in the external open space, the foaming gas is released from the heated core part 1 to the outside. The outer layer part 2 is inflated into a balloon shape using the released gas.

  At this time, in order to release a sufficient amount of gas from the core 1, it is necessary to use a resin having a property that it is difficult to hold the foamed gas as the thermoplastic resin of the core 1. In this embodiment, polypropylene that is particularly suitable among crystalline resins having a low melt tension is used.

Then the next third step, the outer layer 2 and the core portion 1 which has been the expansion, is introduced into the die hole H ₃ of the sizing device S, squeezing the outer layer 3 inflated at the entrance of the die hole H ₃ And irregular wrinkles 21 are formed on the surface.

Note that in Example 1, the size of the die hole H ₃ of the sizing device S, but diameter than the die holes of H ₂ outer layer 2 of the extruder M is a smaller diameter 6 mm, die hole H ₃ of the sizing device S The size of the wrinkles can be adjusted by changing the size.

  Finally, as a fourth step, the core part 1 and the outer layer part 2 introduced into the die D 'of the sizing device S are cooled and formed to integrate them. By the way, during this cooling shaping, the void portion 3 is formed by contraction of the foaming gas existing between the core portion 1 and the outer layer portion 2.

  By adopting the manufacturing method including the first to fourth steps as described above, the artificial rod-shaped object R having the wrinkle pattern can be continuously and efficiently manufactured without using a special apparatus.

“Example 2”
Next, Example 2 of the present invention will be described below. In Example 2, PET-G, which is an amorphous resin, was used for the thermoplastic resin of the core 1 and the production was performed under the same conditions as in Example 1. As a result, the artificial rod R could be produced without any problem. Therefore, it was confirmed that a resin material having a low melt tension and hardly holding the foaming gas can be used for the core 1 even if it is an amorphous resin.

“Example 3”
Next, Embodiment 3 of the present invention will be described below with reference to FIGS. In Example 3, high-density polyethylene (HDPE), which is a crystalline resin, was used as the thermoplastic resin of the core 1, and rice flour was used as biomass powder to be mixed in the outer layer 2. Incidentally, in Example 3, the mixing amount of rice flour is about 33 parts by weight with respect to 100 parts by weight of the resin, and the mixing amount of talc is about 25 parts by weight with respect to 100 parts by weight of the resin. The molding temperature of the extruder (M) is 190 ° C. for the core 1 and 180 ° C. for the outer layer.

  In the second embodiment, the core portion 1 is divided into a plurality of fine cores 11, 11, and formed in the first step at the time of manufacture. In the third and fourth steps, these fine cores 11 11... Were introduced into a die D ′ of the sizing device S and integrated together (see FIGS. 6 and 7).

  By adopting this method, the surface area of the entire core portion 1 can be increased in the second step, and the amount of foaming gas released can be improved. Moreover, when it manufactured on said conditions, the artificial rod-shaped object R was able to be produced without a problem.

Comparative Example 1
Next, Comparative Example 1 of the present invention will be described below. In Comparative Example 1, polystyrene (PS), which is an amorphous resin, was used for the thermoplastic resin of the core 1 and the production was performed under the same conditions as in Example 3. As a result, the escape of the foaming gas from the core part 1 is poor during the second step, and the core part 1 expands greatly. Could not be introduced.

In addition, the data obtained about the manufacturing conditions of the said Examples 1-3 and the comparative example 1 and the presence or absence of molding processability are shown in the following Table 1.

  The present invention is generally configured as described above. However, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the claims. For example, The resin material of the core 1 can be a polyolefin resin (polypropylene, polyethylene, etc.), a polyester resin (PET, polylactic acid), a polyamide resin (nylon) as long as the melt tension is low and it is difficult to hold the foaming gas. A suitable resin can be arbitrarily selected from a crystalline resin such as) or an amorphous resin.

  In addition, as for the foaming agent added to the resin material of the core part 1, inorganic foaming agents such as sodium bicarbonate, sodium carbonate, ammonium bicarbonate, ammonium carbonate, ammonium nitrite, and N, N'-dimethyl-N, N ' -Nitroso compounds such as dinitroso ・ terephthalamide, N, N'-dinitroso ・ pentamethylene ・ tetramine, azodicarbonamide, azodicarboxamide, azobisisobutyronitrile, azocyclohexylnitrile, azodiaminobenzene, barium azodicarboxy Azo compounds such as benzene, benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, P, P'-oxybis (benzenesulfonyl hydrazide), sulfonyl hydrazide compounds such as diphenylsulfone-3,3'-disulfonyl hydrazide, calcium azide, 4,4 ' -Diphenyldisulfur Azide compounds such as phonyl azide and p-toluenesulfonyl azide can be used alone or in combination of two or more.

  On the other hand, as for the biomass powder to be mixed in the outer layer portion 2, wood powder, bamboo powder other than rice flour, rice bran powder, and the like can be used as long as the plant raw material is powdered.

  Further, the amount of the foaming agent added can be freely adjusted between 0.1 and 10 parts by weight with respect to 100 parts by weight of the resin, and the amount of biomass powder mixed is also set to 100 parts by weight of the resin. On the other hand, it can adjust between 5-80 weight part.

  Moreover, the artificial fence-like material R can be used not only as a roofing material but also for other uses such as a flooring material, a rug, or a wall covering, and any of them can be used within the technical scope of the present invention. Belonging to.

  In recent years, the cultural value of thatched roofs has been reviewed again due to the growing nature orientation, and recently, the number of buildings that use thatched roofs has been increasing. On the other hand, there are still few craftsmen who change roofs, and the current situation is that even if a thatched roof is constructed, the subsequent maintenance becomes difficult.

  Under such circumstances, the artificial basket-like product of the present invention and the method for producing the same are useful techniques that can provide a durable alternative to a kite that does not impair the atmosphere of the kite. The value is very high.

1 core
11 Fine core 2 outer layer
21 Wrinkle 3 Void part R Artificial bowl M Extruder S Sizing equipment D Die H Die hole

Claims (10)

  An artificial rod-shaped article comprising: a core portion (1) made of a thermoplastic resin; and an outer layer portion (2) made of a thermoplastic resin having irregular wrinkles (21) formed on the surface thereof.   2. An artificial cage according to claim 1, wherein a crystalline resin is used for the thermoplastic resin of the core (1).   A complex shade pattern is formed along the wrinkles (21) on the surface of the outer layer (2) by adding a dye or pigment as a colorant to the thermoplastic resin of the outer layer (2). Or the artificial rod-shaped object of 2.   The artificial rod-shaped article according to claim 3, wherein a white thermoplastic resin is used for the core portion (1) and a brown thermoplastic resin is used for the outer layer portion (2).   The artificial material according to any one of claims 1 to 4, wherein a biomass powder obtained by pulverizing a plant raw material is mixed with a thermoplastic resin of the outer layer portion (2) to add a texture or fragrance of the plant. Bowl.   The artificial rod-shaped article according to any one of claims 1 to 5, wherein a void portion (3) is provided between the core portion (1) and the outer layer portion (2). A rod-shaped core (1) is formed from a thermoplastic resin mixed with a foaming agent by an extruder (M), and a tubular resin is formed outside the core (1) from a thermoplastic resin not containing a foaming agent. A first step of forming an outer layer part (2); in an external open space where the core part (1) and the outer layer part (2) are extruded from the die (D) of the extruder (M); A second step of inflating the outer layer portion (2) in a balloon shape by the gas released from (1); and the expanded outer layer portion (2) and the core portion (1) in the die hole of the sizing device (S) A _{third step} for introducing irregular wrinkles (21) on the surface by squeezing the outer layer portion (3) introduced into (H ₃ ) and expanded at the entrance of the die hole (H ₃ ); And a fourth step of cooling and shaping the core portion (1) and the outer layer portion (2) introduced into the die (D ′) of (S) and integrating them. Method of manufacturing that artificial Kaya-like material.   The method for producing an artificial rod-shaped article according to claim 7, wherein a crystalline resin which does not easily hold foaming gas is used for the thermoplastic resin of the core (1).   In the fourth step, the core (1) and the outer layer (2) are cooled and shaped so that the void (3) is formed between the core (1) and the outer layer (2). The method for producing an artificial rod according to claim 7 or 8.   In the first step, the core part (2) is divided into a plurality of fine cores (21, 21 ...), and in the third and fourth steps, these fine cores (21, 21 ...) are formed. The method for producing an artificial rod-like object having a wrinkle pattern according to any one of claims 7 to 9, wherein the sizing device (S) is introduced into a die (D ') to be integrated.