KR100232972B1 - A extruding method for grain typed resin and a steel pipe of grain typed resin - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide an extrusion molding method for coating and forming a straight grained resin in a stable state and a straight grained resin coated steel tube manufactured by the molding method.

The present invention incorporates black, brown, red and other multicolored colored heat-resistant grade pellets having a softening melting temperature higher than that of a thermoplastic synthetic resin having a soft melt fluidity mixed with wood powder, and from near the center of the heating tube of the extruder. The heating temperature of the front part is set in the range of 165-180 ° C. A plurality of partitions for distributing the flow of the soft melted resin are provided in the melt flow passage of the die, and extrusion molding is performed while generating the same number of weld lines in the flow of the resin.

Description

A extruding method for grain typed resin and a steel pipe of grain typed resin}

The present invention mainly includes an extrusion molding method for coating and forming a straight grained resin in a stable state, particularly on the surface of a coated resin of a resin coated steel pipe, or a surface of a flat plate integrally formed with a steel pipe, or a surface of a synthetic resin that is extruded, and this molding method. It relates to a straight-coated resin coated steel pipe produced by.

In the conventional method of extruding a relatively thick sheet or the like, extrusion molding is performed by mixing colored pellets having poor dispersibility with thermoplastic resin such as polyvinyl chloride having poor soft melt flowability, thereby causing color unevenness. The shaping | molding method which makes color unevenness at this time into a grain of wood pattern is performed generally.

However, polyvinyl chloride resin has excellent weather resistance and adhesiveness, but when incinerated for disposal, it causes graphite and chlorine gas, which is harmful to the human body, causing it to be a factor of pollution problems.

In order to avoid this pollution problem, it can be considered to adopt ABS resin or AAS resin instead of polyvinyl chloride resin.However, this type of resin has good fluidity during melting. When coating in a thin layer, there is a problem that spurs the dispersion and mixing of the colored pellets, and eventually only changes the color tone of the whole, and there is a problem that the desired wood grain pattern cannot be obtained. In other words, even if the extrusion process is carried out by mixing waste pellets, easy-incineration and safe thermoplastic resins, and mixing and dispersing colored pellets having poor dispersibility, the colored pellets are kneaded when extruded into a thin layer by an extruder. There is a problem that molding of a pattern is difficult.

Accordingly, an object of the present invention is an extrusion molding method of a straight-grained resin which can accurately and reliably form a so-called straight grained grain pattern or a grained grain pattern as required in the circumferential direction of a steel pipe or the width direction of a flat plate member. And to provide a straight grained resin coated steel tube.

As a means for solving the above problems, the straight grained resin extrusion molding method according to the invention of claim 1 is a method of extruding the grained resin, softening than the resin to a thermoplastic synthetic resin having good softening melt fluidity mixed with wood powder Mixing black, brown, red and other multicolored colored heat-resistant grade pellets with high melting temperature, and extruding by setting the heating temperature of the front part in the range of 165-180 ° C from the center of the heating tube of the extruder; A plurality of partitions for distributing the flow of the soft melted resin are provided in the melt flow passage of the die, and extrusion molding is performed while generating the same number of weld lines in the flow of the resin.

In the straight wood grain resin extrusion molding according to the invention of claim 2, the thermoplastic synthetic resin having a good softening melt fluidity of the wood powder according to claim 1 is mixed with ABS resin or AAS resin at a ratio of 20% -40%. It is characterized by mixing.

In the straight grain-patterned resin extrusion method according to the invention of claim 3, the partition described in claim 1 is formed by forming a plurality of partitions in a batch of equal parts or a batch of boiling fractions.

In the straight grained resin extrusion molding method according to the invention of claim 4, the partition described in claim 1 or 3 is formed by forming on one or two of a die or a spout.

In addition, the straight-coated resin corrugated steel pipe according to the invention of claim 5 incorporates black, brown, red, and other multicolored heat-resistant grade pellets having a softening melting temperature higher than that of the thermoplastic synthetic resin having a softening melt fluidity mixed with wood powder. It is extruded to cover the outer circumference of the thin steel pipe by setting the heating temperature of the front part from the vicinity of the center of the heating tube of the extruder to the range of 165-180 ° C. A plurality of partitions are provided in an arrangement in which the circumference of the steel pipe is divided into equal parts, and the same number of weld lines are generated in the axial direction in the flow of the distributed resin to form straight grains of wood.

The present invention does not have a problem of generating graphite and noxious gas during incineration of waste materials, and mixes wood powder in a mixing ratio of 20% to 40%, and has good softening melt fluidity when heated, and specifically, For example, ABS resin or AAS resin is used, and multicolored colored heat-resistant grade pellets having a softening melting temperature higher than or equal to 20 ° C. and higher than the resin are mixed. It is carried out by extrusion molding in the range of.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of an essential part of an extrusion machine used for molding a wood grain resin coated steel pipe of the present invention.

2 is a cross-sectional view of a cross dice used in the first embodiment of the present invention.

FIG. 3 is a development view showing the arrangement of the molten resin flow path and the partition of the cross dice cut along line 10-10 of FIG. 2; FIG.

Figure 4 is a conceptual diagram showing the flow of the steel pipe coating resin and the placement of the weld line.

Fig. 5 is a perspective view of a straight-coated resin coated steel tube formed by the first embodiment.

Fig. 6 is a sectional view of the cross dice used in the third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the arrangement of the melted resin flow path and the partition of the cross die taken along line 14-14 of FIG. 6; FIG.

FIG. 8 is an enlarged cross-sectional view of the molten resin channel of FIG. 7 and the wood grain pattern formed thereby; FIG.

Fig. 9 is a perspective view of a steel pipe formed by molding a resin coating having a straight pattern on a flat plate portion according to a third embodiment;

10A and 10B show a second embodiment of the present invention, FIG. 10A is a cross-sectional view of the snout cut along the line 17'-17 'of FIG. 10B, and FIG. 10B is cut along the line 17-17 of FIG. 10A. A cross section of one snout.

* Explanation of symbols for the main parts of the drawings *

C: heating vessel C3-C4: front portion from near the center of the heating vessel

2,2 ': molten resin flow path 4: partition

9: spout 10: thin steel pipe

R: weld line

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the extrusion method of the straight grain resin and the straight grain resin coated steel tube of the present invention.

The steel pipe of the present invention is molded using an extruder of the cross die type shown in FIG. First, the structural outline of the main part of the extruder of FIG. 1 will be described. In the heating cylinder C, the screw S is freely inserted in a rotational direction. The head H is provided in the front-end | tip of the said heating cylinder C, and the cross dice D is attached to this head H at right angles with the said heating cylinder C. As shown in FIG. The cross die (D) has a structure in which a thin steel pipe (10) penetrates in a direction perpendicular to the heating tube (C), and moves forward in the direction of the arrow (K) in synchronization with the extrusion of the soft melted resin. The soft molten resin extruded from the heating tube C by the rotation of the screw S is coated on the outer circumferential surface of the thin steel pipe 10 in a uniform thin layer through the cross die D.

However, in the case of forming a straight grained wood grain pattern, the cross die type extruder may also be used in any one or two of the cross dice D or the spout 9 of Fig. 2, Fig. 3, Fig. 6, Fig. 7, As shown in Fig. 8, a plurality of partitions 4 for distributing the flow of the softened melted resin to the molten resin flow passage are formed by arranging equal parts or arranging parts according to the design of the wood grain pattern. As one form of the molding result, the straight-coated resin coated steel pipe of claim 5 as shown in FIG. 5 or the wood grain flat plate member of FIG. 9 can be obtained.

According to the molding method of the present invention, a synthetic resin having good soft melt fluidity mixed with wood powder has a heating temperature of 140 ° C (C1-C2) from the base (left part of FIG. 1) to the vicinity of the center of the heating tube of the extruder. Since it is set as low as about -160 degreeC, even if it starts softening and melting, the multicolored colored heat-resistant grade pellets whose softening temperature to softening melting temperature is about 20 degreeC do not soften and melt at the said heating temperature. Subsequently, the water support material proceeds from the center of the heating tube to the high temperature zone (Division C3-C4), and softening melt proceeds to increase the fluidity, while the multi-colored heat-resistant grade pellet gradually starts to soften and melt. Stretched to shape. In the process of coating the outer peripheral surface of the steel pipe 10 through the head (H) and cross dice (D), the softening molten resin is further compressed, and each colored heat-resistant grade pellet forms a wood grain pattern (colored pattern) in a stripe shape. do.

The set temperature of four places (C ₁ -C ₄ ) which divided the heating vessel (C) in the axial direction, and the two places (D ₁ , D ₂ ) which divided the cross die (D) in the penetrating direction of the thin steel pipe (10). Set temperature (see FIG. 1) is controlled as having a significant effect on the formation of wood grain patterns. Hereinafter, the change of temperature pellets and colored pellets for each part of the extruder will be described through examples.

(Heater: C)

Site C ₁ ; Temperature 145 ℃; No change of pellet

C ₂ ; Temperature 160 ℃; No change of pellet

C ₃ ; Temperature 165 degrees Celsius; pellet increases slightly

C ₄ ; Temperature 175 ℃; pellets stretch 15-30mm

(Head H) Temperature 200 degrees Celsius; Pellet stretches a little thin continuously

(Dice D)

D ₁ ; Temperature 200 ° C .; The pellets are continuously stretched into thin threads

D ₂ ; Temperature 210 ℃; pellets continuously stretch in stripe shape

In other words, when the temperature of the front portion (section C ₃ -C ₄ ) is in the range of 165-175 ° C from near the center of the heating vessel C, good wood grain pattern is formed. And the synthetic water support material mixed with wood powder becomes light brown ground color called wood color unique to wood powder when it softens and melts in each part of C ₁ -C ₄ of the heating tube. In addition, black, brown, red and other colored heat-resistant grade pellets are not softened and melted in the division of low temperature zone C ₁ -C ₂ because the softening melting temperature is set high before and after 20 ℃ for the ABS resin of the main raw material. Maintain a circular state of.

The colored heat-resistant grade pellet gradually starts softening melting as the progress of the heating zone C from the vicinity of the center to the high temperature region of the front part (Section C ₃ -C ₄ ). As the flow increases, it grows into a real shape.

As an example, the thickness of the resin layer with increased fluidity to suit the softening and melting in the heating vessel C is sequentially compressed to 12 mm in division C ₁ , 6 mm in C ₂ , and ₃ mm in C ₃ and C ₄ to be thin and long. do.

The colored pellets also increase the degree of softening melting, and are further increased when passing through the narrowed tap water 14 of the head H, and are brought into an elongated state intermittently in the form of a thin and long thread. In addition, when proceeding to the cross die (D), in the first division (D ₁ ), the outer peripheral surface of the thin steel pipe is already covered, but the layer thickness of the softening melted resin at this time is compressed to 2 mm, and the colored pellet is slightly widened. When the second segment (D ₂ ) is reached, the softening melt layer thickness is further narrowed to 1 mm, so that the colored pellets become wider and become a pattern that is tightly muscled, and the colored pattern is apparent. It becomes a grain of wood pattern.

In addition, if the temperature of the front part (parts C ₃ -C ₄ ) is too low (for example, 150-160 ° C) in the center of the hot zone of the heating tube (C), the colored pellets are used to define the circle of pellets. It passes through the state and is sent to the cross dice (D). In such a case, even if the temperature rises sharply at the site of the head H and the cross die D, the colored pellet is softened and is extruded as it is, and the colored pellets are only formed as particulate color spots and node spots. On the contrary, when the temperature of the front part (part C ₃ -C ₄ ) is too high (for example, 190 ° C. or more) near the center of the heating tube (C), the colored pellet softens and melts in the heating tube (C). Fluidity occurs, kneaded and dispersed, and the whole color tone (background color) changes black, but wood grain patterns are not formed.

First Embodiment

Next, a description will be given of an embodiment of extrusion molding the straight-coated resin coated pipe according to the invention of claim 5 as shown in FIGS. 2 to 5. As a first point of the characteristics of the invention as described in claim 1, black, brown, red and other multicolored color heat-resistant grades having a soft melt temperature of about 20 ° C. higher than that of the synthetic resin in a thermoplastic resin having good fluidity mixed with wood powder Mixing the pellets and softening and melting the heating temperature of the front portion (C ₃ -C ₄ ) in the range of 165-180 ° C. near the center of the heating tube C of the extruder as shown in Fig. 1 have already been shown. As described in 1, separate description is omitted.

In this connection, the compounding example of the thermoplastic synthetic resin is specifically indicated as follows.

(Formulation example: 1)

74 weight% of ABS resin which mixed 40% of wood powder,

10% by weight of black ABS heat-resistant grade pellets,

10% by weight of brown ABS heat-resistant grade pellets,

6% by weight of red ABS heat-resistant grade pellets,

These blended raw materials are mixed, fed to an extruder through the hopper 15, and coated and adhered to the outer circumferential surface to which the adhesive is applied in advance.

(Example: 2)

71.5 weight% of ABS resin which mixed 40% of wood powder,

20% by weight of beige ABS heat-resistant grade pellets,

8.5% by weight of orange ABS heat-resistant grade pellets,

This coating resin was light brown and formed a milky white grain pattern.

(Combination example: 3)

74 weight% of AAS resin which mixed wood powder 40%,

10% by weight of black AAS heat-resistant grade pellets,

10% by weight of brown AAS heat-resistant grade pellets,

6% by weight of red AAS heat-resistant grade pellets,

A second point of the features of the present invention as set forth in claim 1 is to provide a plurality of partitions for distributing the flow of the flowable resin in the soft melted resin flow path of the cross die (D), which is applied to an extruder as shown in FIG. The extrusion is performed while generating the same number of weld lines in the resin flow.

Fig. 2 shows a cross dice 13 which is improved for carrying out the present invention. Reference numeral A represents the flow of the resin. This cross die 13 is applied to an extrusion molding machine as shown in Fig. 1, where the tap water 2 leading from the heating vessel C to the head H reaches the outer circumference of the thin steel pipe 10. At two or more flow paths (3a, 3b) circumferentially surrounding the outer circumference of the steel pipe (10). As shown in the developed view in FIG. 3, the flow paths B are divided into 16 partitions 4 arranged in a manner of dividing the circumference of the thin steel pipe 10 into 16 equally and distributing the flow A of resin to 16. Therefore, the resin covering the outer circumferential surface of the thin steel pipe 10 via each flow path B is divided into 16 equal parts of the circumference of the thin steel pipe 10 as shown in the conceptual diagram shown in FIG. The weld line R and a continuous stripe of colored pellets are formed in the axial direction in the vicinity thereof. The appearance of the resin-coated steel pipe thus manufactured is equally spaced in the circumferential direction as illustrated in FIG. 5, and the weld lines R parallel to the axial direction form a wood grain pattern.

The partitions 4 of the cross dice 13 are provided in plural or in batches which are divided into molten resin flow paths according to the design of the wood grain pattern. When the arrangement of the boiling portion is made, there is a straight grained wood grain pattern with no gaps. The partition 4 may be provided in any one or both of the molten resin passage or the spout 5 of the cross die 13. have. This also depends on the design of the wood grain pattern.

Second Embodiment

10A and 10B show the circumference of the plurality of partitions 4 for distributing the flow of the soft melted resin to the spout 9 of the cross die 13 covering the synthetic resin on the outer circumference of the thin steel pipe 10 as in FIG. The embodiment arrange | positioned equally is shown. By the spout 9 of this structure (even alone), as described above, the weld lines R parallel to the axial direction of the steel pipe 10 can be formed in the same arrangement as the partition 4 in the same number. A straight grain of wood grain pattern can be obtained on the appearance of the molded resin coated steel pipe. Of course, by using together with the partition 4 of the cross die 13 of 1st Embodiment mentioned above, it can shape | mold to a stable state more reliably and accurately.

Third Embodiment

Next, as shown in FIG. 9, FIGS. 6 to 9 are axially aligned on the upper surface of the flat plate 6 of the steel pipe member integrally formed with the extruded coated resin and integrally formed with the flat plate 6 in the tangential direction. The cross die | dye 16 improved in order to extrusion-extrude the parallel grained grain pattern layer 7 is shown. In the case of the cross dice 16, the water supply 2 which is connected to the heating cylinder C of the molding machine has a width that is slightly larger than the width dimension of the same flat plate 6 in the vicinity of the flat plate 6 to be molded. A plurality of partitions 4 are formed at predetermined intervals, which are extended and lined horizontally in the resin flow passage 2 'of the largest width portion and distribute the flow of the resin. The width dimension is slightly reduced to match the covering width of the wood grain pattern layer 7 of the flat plate portion at the end from the portion where the partition 4 is installed (Fig. 7, Fig. 8) and the depth of the same flow path 2 '. Finally, it becomes narrow enough to become the coating layer thickness of wood grain pattern resin (refer FIG. 6). In addition, the cross die 16 coats the synthetic resin on the outer circumferential surface of the thin steel pipe 10, and at the same time, the spout 8 for integrally extruding the flat plate portion 6 also moves forward and backward in the traveling direction K of the steel pipe. They are united in a batch. Therefore, the soft melted resin extruded in the molding machine passes through the flow path 2 'divided by the partition 4 of the cross die 16, and then is slightly compressed and joined again to coat the upper surface of the flat plate 6. As shown in Fig. 8, the conceptual diagram in which the molding resin layer E is developed is slightly enlarged, and the stripes of the colored pellets are parallel in the axial direction together with the weld lines R in which the overall width of the wood grain layer 7 is equally divided. The appearance of the wood grain pattern 7 of the flat plate portion 6 thus produced is shown by weld lines (R) parallel to the axial direction at equal intervals in the axial direction, as illustrated in FIG. 9. You can get a grain of wood pattern.

Also in the present embodiment, the partition 4 of the cross dice 16 is provided in plural or in an arrangement of equally divided resin flow paths in accordance with the design of the wood grain pattern. Uneven straight grains of wood are formed. Developing the second embodiment, it will be appreciated that resin coating of wood grains, in particular straight grains, can be carried out with the exact same technique for extruded planar or curved plate members.

As described above, according to the present invention, even when the material of the coated resin of the resin coated steel pipe is incinerated, the problem of pollution does not occur in terms of graphite, harmful gas, etc., and the fine grained pattern on the coated resin is extruded. It can form stably and efficiently, and can increase the design value and economic value of resin coated steel pipe. And by using the wood grain pattern resin coated steel pipe according to the use place and use, it can contribute to the improvement of the design aesthetics of the structure.

The present invention also provides a method of forming a grained pattern on the surface of an extruded plate member or the like, or a so-called straight grained grain pattern or a grained pattern as required in the circumferential direction of the steel pipe or the width direction of the plate member. It is possible to form precisely and reliably, further increase their design value and economic value, and contribute to the improvement of the design aesthetic appearance of the structure depending on the use place and use of the wood grain resin coated steel pipe.

Claims (5)

In the method of extruding wood grain resin, a mixture of black, brown, red and other multicolor colored heat-resistant grade pellets having a softening melting temperature higher than this resin is mixed with a thermoplastic resin having good softening melt fluidity mixed with wood powder. The extrusion temperature by setting the heating temperature of the front portion from the center of the heating vessel to the range of 165-180 ° C., and installing a plurality of partitions for distributing the flow of the molten molten resin to the melt flow passage of the die. Extrusion molding method, characterized in that the extrusion molding while generating the same number of weld lines in the flow. The method of claim 1, wherein the thermoplastic resin having good softening melt fluidity mixed with wood powder is mixed with ABS resin or AAS resin at a mixing ratio of 20% to 40%, respectively. . The extrusion molding method of straight patterned resin according to claim 1, wherein the partition is formed by forming a plurality of partitions in a batch of equal parts or a batch of boiling parts. The extrusion molding method of straight patterned resin according to claim 1 or 3, wherein the partition is formed by forming on one or two of a die or a spout. The coated resin of resin coated steel pipe is mixed with thermoplastic resin having good softening melt fluidity mixed with wood powder and mixed with colored, heat-resistant grade pellets of black, brown, red and other colors having higher softening melting temperature than this resin, and heating tube of extrusion molding machine. The extrusion temperature was formed to cover the outer circumference of the thin steel pipe by setting the heating temperature of the front portion from the center of the front portion to 165-180 ° C. A straight grain resin coated steel pipe, characterized by arranging a plurality of partitions in a batch and generating the same number of weld lines in the axial direction in the flow of distributed resin to form a grain of wood grain.