JP5230014B2 - Synthetic resin material hard-soft coextrusion molding method and rain gutter formed by this method - Google Patents

Description

The present invention relates to a hard and soft coextrusion molding method of a synthetic resin material in which a hard synthetic resin material and a soft synthetic resin material are joined in a molding die and extruded to produce a rain gutter , and a rain formed by this method. The present invention relates to an improved invention of a bag .

Conventionally, hard as hardness simultaneously molded article formed by the extrusion molding method軟同, elongated synthetic resin moldings include, for example, gutter, such as square or cylindrical Tatetoi and eaves gutters (e.g., Patent Documents 1). These gutters are made of a hard synthetic resin material, and a part is made of a soft synthetic resin material, so the bulk of the gutter can be reduced by folding or flattening the soft synthetic resin portion. Can be transported and stored in the same condition.

Japanese Patent Publication No. 48-42887

By the way, in this kind of rain gutter , a soft synthetic resin portion is formed in a band shape in the longitudinal direction between hard synthetic resin portions, and a hard synthetic resin portion and a soft synthetic resin portion appear alternately on the cut surface. That is, the hard synthetic resin portion and the soft synthetic resin portion are joined so that the respective thin plate-like synthetic resin portions are arranged side by side and the side end faces are butted together, and the joint boundary surface is formed by the hard-soft simultaneous molding. It is a belt-like surface that is substantially perpendicular to the front and back surfaces of the product, and whose height is the thickness of the hard-soft simultaneous molded product.

  In this way, the hard synthetic resin part and the soft synthetic resin part are joined by joining their band-shaped side end faces to each other, so the joining area is extremely small, and it has been pointed out that the joining force is weak in the past. It was. Particularly, in recent years, the thickness has been reduced for the purpose of reducing the material or with the progress of the extrusion molding technology, but it goes without saying that the thinner the thickness, the weaker the bonding force.

The present invention has been proposed in view of such circumstances, and the object thereof is a hard-soft coextrusion molding method capable of increasing the bonding strength between the hard synthetic resin portion and the soft synthetic resin portion, and the formation by this method. Is to provide a rain gutter .

In order to achieve the above object, the method of hard and soft simultaneous extrusion molding of a synthetic resin material according to claim 1 supplies a hard synthetic resin material and a soft synthetic resin material for each material to a corresponding lane of a molding die. In a method for co-extrusion of hard and soft synthetic resin materials, a long gutter having a joint boundary surface between a hard synthetic resin portion and a soft synthetic resin portion is manufactured. One of the synthetic resin materials and the soft synthetic resin material is supplied in a molten state to the supply portion of the lane through a corresponding lane having a detour bonding boundary surface forming portion for forming a detour bonding boundary surface. and, in the supply portion of the lane, also supply the other synthetic resin material in a molten state, without merging into one synthetic resin material, the downstream side of the supply unit, the other synthetic resin material, the detour Bonding interface formation main part Is continuously provided, shaped to form a bypass junction interface formed on both surfaces, it was allowed to pass through the bypass junction interface formed auxiliary part of the partition wall shape by merging with one of the synthetic resin material, hardness A detour joint interface having a larger joint area than the thickness of the hard-soft co-molded product is formed on the co-molded product.

  In the method of co-extrusion molding of the synthetic resin material according to claim 2, the detour joint interface is an inclined surface.

  In the method of co-extrusion molding of the synthetic resin material according to claim 3, the detour joint boundary surface is a curved surface.

  In the hard and soft simultaneous extrusion molding method of the synthetic resin material according to claim 4, the detour joint boundary surface is a male and female structure surface.

  In the method of coextrusion molding of the synthetic resin material according to claim 5, the detour joint interface is a folded surface.

The rain gutter according to claim 6 is formed by the hard-soft co-extrusion method of the synthetic resin material according to any one of claims 1 to 5.

According to the hard and soft simultaneous extrusion molding method of the synthetic resin material according to claim 1, a detour joint interface forming main part and a detour for forming a joint interface between the hard synthetic resin part and the soft synthetic resin part on the molding die By providing a detour joint boundary surface forming portion composed of a joint boundary surface forming auxiliary portion and forming a detour joint boundary surface having a larger joint area than the thickness of the hard and soft simultaneous molded product in the hard and soft simultaneous molded product. Therefore, the bonding area between the hard synthetic resin portion and the soft synthetic resin portion can be increased, and the bonding strength can be increased.

According to the hard and soft coextrusion molding method of the synthetic resin material according to claim 2, since the detour joint boundary surface is an inclined surface, the detour composed of the detour joint boundary surface forming main portion and the detour joint boundary surface forming auxiliary portion A joining boundary surface formation part can be made into a simple shape.

According to the hard and soft coextrusion molding method of the synthetic resin material according to claim 3, since the detour joint boundary surface is a curved surface, the detour joint boundary surface forming main portion and the detour joint boundary surface forming auxiliary portion having a simple shape With the constructed detour joint interface forming portion, the joint area can be increased.

  According to the hard and soft coextrusion molding method of the synthetic resin material according to claim 4, since the detour joint boundary surface is a male and female real structural surface, the joining force can be enhanced by the real structure.

  According to the hard and soft coextrusion molding method of the synthetic resin material according to the fifth aspect, since the detour joint boundary surface is a folded surface, the joint strength can be increased by the engagement of the hard synthetic resin portion and the soft synthetic resin portion.

According to the rain gutter according to claim 6, since a high bonding strength is obtained, it can be stored in a flat state before shipment and used for a long product such as a rain gutter formed in a three-dimensional state on site.

BRIEF DESCRIPTION OF THE DRAWINGS It is a reference example of the principle explanatory drawing of the soft-soft coextrusion molding method of the synthetic resin material of this invention, (a) is a schematic cross-sectional view of a shaping | molding die, (b) is a schematic front view of the molded article exit side of a shaping | molding die. . It is a fragmentary perspective view of the hard-soft simultaneous molded product shape | molded by the shaping | molding die shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is an example of the principle explanatory drawing of the soft-soft coextrusion molding method of the synthetic resin material of this invention, (a) is a schematic cross-sectional view of a shaping | molding die, (b) is a schematic front view of the molded article exit side of a shaping | molding die. (A)-(g) is the schematic longitudinal cross-sectional view which showed the various examples of the cross-sectional shape of the soft synthetic resin part of a hard-soft simultaneous molded article, (a) is a soft synthetic resin part, a hard synthetic resin resin part, FIG. (A) is a longitudinal cross-sectional view at the time of molding of a square ridge which is an example of a hard / soft co-molded product formed by the hard / soft co-extrusion molding method, (b) is a partially enlarged view of the hard / soft co-molded product, and (c). FIG. 4 is a partially enlarged view showing a state where the part shown in FIG. (A) is a longitudinal cross-sectional view at the time of construction of the same square shape iron, (b) is the perspective view. It is a longitudinal cross-sectional view of the eaves ridge which is another example of the hard-soft simultaneous molded article formed by the same hard-soft simultaneous extrusion molding method.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a reference example of a principle explanatory diagram of a method for co-extrusion molding of a synthetic resin material according to the present invention. FIG. 1 (a) is a schematic cross-sectional view of a molding die for carrying out the method. b) is a schematic front view of the molded die outlet side of the molding die. FIG. 2 is a partial perspective view of the hard and soft simultaneous molded product molded by the molding die shown in FIG.

  The molding die 10 shown in FIG. 1 allows the hard synthetic resin material 1 and the soft synthetic resin material 2 to be simultaneously passed in a state where they are heated and melted, and has a uniform cross section and a long hard and soft simultaneous molded product 20 ( It is an extrusion mold for manufacturing (refer FIG. 2). The molding die 10 is provided with lanes corresponding to the hard synthetic resin material 1 and the soft synthetic resin material 2 (main lane 11 and tributary lane 12). In addition, about the extruder which extrudes a synthetic resin material, since it is a general purpose apparatus, illustration is abbreviate | omitted.

  As shown in FIG. 2, the hard and soft simultaneous molded product 20 molded by the molding die 10 has a hard synthetic resin portion 21 and a soft synthetic resin portion 22 alternately appearing in the cross section. In the principle diagram (FIG. 1), an example of a hard and soft simultaneous molded product 20 (see FIG. 2) in which a soft synthetic resin portion 22 appears between an L-shaped hard synthetic resin portion 21 and a flat hard synthetic resin portion 21 is illustrated. Yes. That is, in the molding die 10, two main lanes 11 corresponding to the L-shaped hard synthetic resin portion 21 and the flat hard synthetic resin portion 21, and a tributary lane 12 corresponding to the soft synthetic resin portion 22, respectively. Is formed.

In the example of the principle explanatory diagram, the hard synthetic resin material 1 is the main material, and the soft synthetic resin material 2 which is the sub-material is interposed between the main materials, and the molded soft synthetic resin portion 22 can be bent. Although an example of manufacturing the hard-soft simultaneous molded article 20 is shown, the reverse arrangement may be used. Alternatively, the soft synthetic resin material 2 may be passed through the main lane 11 and the hard synthetic resin material 1 may be passed through the tributary lane 12.

  As the synthetic resin material, polyethylene, polypropylene, vinyl chloride resin, ABS resin, polycarbonate, or the like can be used. If the joint strength of the hard synthetic resin material 1 and the soft synthetic resin material 2 is taken into consideration, the synthetic resin material that is the main raw material is made common and the additives are different, so that the hard synthetic resin material 1 and the soft synthetic resin material are different. It is desirable to make 2.

  As shown in FIG. 2, a curved joint boundary between the hard synthetic resin portion 21 and the soft synthetic resin portion 22 (hereinafter referred to as a joint boundary line 23) appears in the cross section of the hard and soft co-molded product 20. Since it is extrusion molding, a detour joint boundary surface 24 (indicated by a reference numeral together with the joint boundary line 23 in the figure) is formed in the longitudinal direction of the hard and soft co-molded product. Yes.

  In the method of the present invention, the joint boundary line 23 is not the shortest straight line in the thickness direction of the molded product of the hard and soft co-molded product 20 but the detour joint boundary surface 24 detoured into a curved surface as shown in the figure. Both synthetic resin materials are partitioned.

  In the example of the principle diagram, along the longitudinal direction between the flat hard synthetic resin portion 21 and the soft synthetic resin portion 22 and between the L-shaped hard synthetic resin portion 21 and the soft synthetic resin portion 22, respectively. Bonding boundary surfaces are formed, and both of these bonding boundary surfaces serve as a detour bonding boundary surface 24.

  Hereinafter, the manufacturing method of the hard-soft simultaneous molded product 20 in which such a detour joint interface 24 is formed will be specifically described.

  First, the hard synthetic resin material 1 which is the main material heated and melted is supplied to the main lane 11 corresponding to the main material of the molding die 10 (not shown; positioned on the upper side in FIG. 1A). More, it passes through the forming die 10. In the portion of the molding die 10 from the supply port to the portion A in the figure, a bypass joint boundary surface forming portion 14 for forming the bypass joint boundary surface 24 in the hard and soft simultaneous molded product 20 is provided and flows. When the hard synthetic resin material 1 passes through the end portion 14a of the detour joint boundary surface forming portion 14 and reaches the junction 13 (A portion in the figure) adjacent to the end portion 14a, the detour joint boundary surface It is controlled so that it is in a molten state to the extent that the shape of 24 can be maintained.

  On the other hand, the soft synthetic resin material 2, which is a heat-melted secondary material, is supplied from the supply port 12a of the tributary lane 12 on the side of the main lane 11, and in the molten state, is co-flowed with the hard synthetic resin material 1. A is started to reach the A part, and is joined so as to be in contact with the detour joint boundary surface 24 formed at the end of the hard synthetic resin material 1 supplied to the joining part 13 in the molten state, and downstream together with the hard synthetic resin material 1 It is trying to pass to the side.

  In this way, the hard synthetic resin material 1 and the soft synthetic resin material 2 are joined in a molten state with the detour joint interface 24 having a certain shape as a boundary, and are extruded from the molded product outlet of the molding die 10 in the joined state. Then, after being cooled and solidified by sizing, the hard-soft simultaneous molded article 20 is formed.

  In this way, both synthetic resin materials are joined and solidified by the detour joint boundary surface 24 in the molding die 10, and in order to perform such control, the composition at the time of supply, which is a control element thereof, is used. It is necessary to adjust the melting temperature of the resin material, the length of the lane, the end position of the detour joint boundary surface forming portion 14, the position of the joining portion 13, the passing speed, and the like. If adjustment is not made so that the joints can be made at the part A, for example, the bypass joint boundary surface 24 is not formed in the hard synthetic resin material 1 at the part A, the adjustment is performed by the method shown in the principle explanatory diagram of FIG. can do.

In the molding die 10 shown in the explanatory diagram of FIG. 3, as in the molding die 10 of FIG. 1, from the supply port (not shown) of the main lane 11 to the A part (supply part) in the figure, hard and soft simultaneous molding are performed. A bypass junction boundary surface forming main portion 14A for forming the bypass junction boundary surface 24 on the product 20 is provided, and the branch lane 12 is also provided at the same position, but on the downstream side from the A portion (supply portion). Further, a detour joint boundary surface formation auxiliary portion 14B is provided.

That is, the soft synthetic resin material 2 supplied from the supply port 12a of the tributary lane 12 is not controlled to the extent that the detour joint interface 24 can be held by the hard synthetic resin material 1 in the portion A (supply portion). The synthetic resin material 1 is not merged, but is allowed to co-flow through the detour joint boundary surface formation auxiliary portion 14B provided continuously with the detour joint boundary surface formation main portion 14A. In other words, in the explanatory diagram of the present principle, the detour joint boundary surface forming portion 14 is constituted by the detour joint boundary surface forming main portion 14A and the detour joint boundary surface forming auxiliary portion 14B. In addition, in FIG. 3, the detour junction boundary surface 24 of a continuous waveform shape is illustrated.

  The detour bonding boundary surface formation auxiliary portion 14B has a shape for forming the detour bonding boundary surface 24 on both sides so that the hard synthetic resin material 1 and the soft synthetic resin material 2 can flow in a molten state on both sides thereof. The partition wall is formed.

  And in the terminal part 14a of this detour joint interface formation part 14, ie, the terminal part of detour joint interface formation auxiliary part 14B, detour joint interface 24 was formed in hard synthetic resin material 1, and passed the terminal part 14a. By the way, both synthetic resin materials merge in a molten state. At the junction 13, the soft synthetic resin material 2 is in close contact with the detour joint interface 24 formed in the molten hard synthetic resin material 1, and then joined in the molten state. After being extruded from the molded product outlet and cooled and solidified by sizing, the hard-soft simultaneous molded product 20 is formed.

  As described above, the forming die 10 shown in FIG. 3 is obtained by adjusting the position of the merging portion 13 by adding the detour bonding boundary surface forming auxiliary portion 14B to the detour bonding boundary surface forming main portion 14A. . Further, according to the molding die 10 provided with the detour joint boundary surface formation auxiliary portion 14B having the formation surfaces on both sides in this way, the detour joint interface surface 24 is formed in the soft synthetic resin material 2 in the molten state, The hard synthetic resin material 1 can also be bonded to the detour bonding interface 24. In the example of the principle explanatory diagram of FIG. 3, the bypass junction boundary surface forming main portion 14 </ b> A may also have a partition wall shape.

  Next, the detour joint interface 24 of the hard and soft co-molded product 20 formed as described above will be described with reference to FIG.

  FIG. 4A shows a cross-sectional perspective view of the hard and soft simultaneous molded product 20 having the detour joint interface 24. The detour joint boundary surface 24 is formed in a slope shape, and the joint area thereof is the area of the joint boundary surface S corresponding to the thickness L of the hard and soft simultaneous molded product 20 shown on the right side of FIG. Therefore, the bonding strength between the hard synthetic resin portion 21 and the soft synthetic resin portion 22 is also high.

  In the example shown in FIG. 4A, the detour joint boundary surface 24 of the inclined surface is formed so that the soft synthetic resin portion 22 is bilaterally symmetric, but in the example of FIG. 4B, the soft synthetic resin portion The detour joint boundary surfaces 24 on both sides of 22 are formed in parallel. According to these, the detour joint boundary surface formation part in a shaping | molding die can be made into a simple shape.

  Further, in the example of FIG. 4C, a detour joint boundary surface 24 with a continuous curved surface is shown, similar to the example of the principle explanatory diagram of FIG.

  4 (d), 4 (e), and 4 (f), the hard synthetic resin portion 21 and the soft synthetic resin portion 22 are joined by a male / female structure, and the hard / soft simultaneous molded product 20 shown in FIG. 4 (d). The soft synthetic resin portion 22 has two male real parts, and the hard-soft co-molded product 20 in FIG. 4E has the soft synthetic resin portion 22 has two female real parts. In the simultaneous molded product 20, the soft synthetic resin portion 22 includes both a male real part and a female real part. According to these, since it is actual joining, joining force can be strengthened.

  Further, the hard-soft co-molded product 20 in FIG. 4G is formed of a bent surface in which the detour joint interface 24 is continuous.

  In all of the examples shown in FIG. 4, since the bypass joint boundary surface 24 is formed, the joint area is the area of the joint boundary surface S corresponding to the thickness L of the hard and soft simultaneous molded product 20 (see FIG. 4A). It is possible to increase the bonding force without fail. In the example of FIGS. 4A to 4C, the joint area of the detour joint interface 24 can be increased to about 1.4 times the area of the joint interface S shown in FIG. In the examples of (d) to (g), it can be increased by about twice. Of course, it can be even larger.

  In this way, various shapes of the detour joint interface 24 can be assumed, but for example, one having a detour joint interface 24 having a different shape, such as one having a folded surface and the other having an actual structure.

  Examples of the hard and soft simultaneous molded product 20 having the above-described detour joint interface 24 include a hard and soft simultaneous molded product for forming a long product. The hard-soft co-molded product 20 manufactured by such a molding method can be obtained by deforming the soft synthetic resin portion 22 after molding if the soft synthetic resin portion 22 is manufactured so as to be disposed at an appropriate position in the cross section. It can be formed into a product of the shape.

  Fig.5 (a) is a longitudinal cross-sectional view at the time of the shaping | molding of the square ridge which is an example of the hard-soft simultaneous molded product shape | molded by said hard-soft simultaneous extrusion molding method.

  In the state of being extruded from the molding die 10 (see, for example, FIG. 1), the square rod 5 has a shape in which two substantially flat molded portions formed using a hard synthetic resin material as a main material are polymerized. In addition, both ends of each molded portion are connected by a soft synthetic resin portion 22, and the soft synthetic resin portion 22 is also formed at the center of each substantially flat plate-shaped molded portion. That is, four sets of combinations of the hard synthetic resin portion 21 and the soft synthetic resin portion 22 are continuously formed in a flat ring shape. In addition, 5a in a figure is a reinforcement rib.

  FIGS. 5B and 5C show enlarged views of some soft synthetic resin portions 22 of the four sets. Since the soft synthetic resin portion 22 is foldable, it is deformed from the shape of FIG. 5B at the time of molding to the shape of FIG. 5C, or from the shape of FIG. 5C to FIG. 5A. It can be transformed into a shape. In addition, the detour joint boundary surface 24 between the hard synthetic resin portion 21 and the soft synthetic resin portion 22 in this example is a simple actual structure surface in which protrusions and recesses are formed at both ends.

  In this way, the other soft synthetic resin portions 22 can be freely deformed in the same manner, so that the flat state is changed to the three-dimensional state, and the rectangular ridge 5 as shown in FIGS. 6A and 6B is formed. can do. The soft synthetic resin portion 22 preferably has a small elastic restoring force so that when deformed to form a predetermined product, the deformed shape can be maintained. In the case of 5, since the shape can be held by the heel support (not shown), the elastic restoring force may be large.

  FIG. 7 is a longitudinal sectional view at the time of forming eaves which is another example of the hard-soft simultaneous molded product formed by the above-described hard-soft simultaneous extrusion molding method.

  The eaves cage 6 includes a front portion 6a provided with a front end locking portion 6d for locking with a heel support (not shown), a bottom portion 6b, and a rear end locking portion for locking with the heel support. A rear portion 6c provided with 6e is formed of a hard synthetic resin material, and a soft synthetic resin portion 22 is formed between the hard synthetic resin portions 21 formed of the hard synthetic resin material. The detour joint boundary surface 24 between the hard synthetic resin portion 21 and the soft synthetic resin portion 22 in this example is a simple actual structural surface in which protrusions and recesses are formed at both ends.

  As shown by an imaginary line, the front portion 6a, the bottom portion 6b, and the rear portion 6c are in a flat (flat) state, and the front portion 6a and the rear portion 6c are bent in the direction of the arrow. Thus, the eaves 6 in a three-dimensional state is formed.

As described above, if the square basket 5 or eave basket 6 is formed by the hard-soft co-molded product formed by the above-mentioned hard-soft co-extrusion molding method, it is not bulky when stored in a warehouse or transported by truck. In this way, the flat state can be maintained, thereby saving space and reducing the packaging material.

  In addition, since the number of transports in one transport increases and the transport count decreases, it is possible to contribute to a reduction in carbon dioxide emissions. It has been proved by experiments that the amount of discharge can be reduced to about 1/3 in the case of a square basket and about 2/3 in the case of an eaves.

  In addition, the co-molded product 20 by the co-extrusion method has a bonding strength higher than that of the conventional one due to the formation of the detour bonding boundary surface 24. Especially suitable for products that need to be repeated many times. For example, rain gutters used in cold regions can be removed and stored while avoiding damage due to snow during snowfall, and can be reattached after the snowfall, but can be flattened during storage, requiring a lot of storage space In addition, a detoured joint interface is formed between the hard synthetic resin part and the soft synthetic resin part, and the joint strength is getting higher, so even if it is three-dimensional and flattened every season, it will not be damaged Long life can be expected.

DESCRIPTION OF SYMBOLS 1 Hard synthetic resin material 2 Soft synthetic resin material 10 Molding die 11 Mainstream lane 12 Tributary lane
A Supply unit 13 Junction unit 14 Detour joint boundary surface forming unit
14A Detoured joint interface formation main part
14B Detoured joint boundary surface formation auxiliary portion 20 Hard and soft co-molded product 21 Hard synthetic resin portion 22 Soft synthetic resin portion 23 Joint boundary line 24 Detour joint boundary surface 5 Square ridge 6 Eaves

Claims (6)

The hard synthetic resin material and the soft synthetic resin material are supplied to the corresponding lanes of the molding die for each material and then joined together to provide a joint interface between the hard synthetic resin portion and the soft synthetic resin portion. In the method of hard and soft co-extrusion of synthetic resin material to produce a long rain gutter ,
Said hard synthetic resin material, one of the synthetic resin material of the soft synthetic resin material, is passed through the corresponding lane had a bypass joining boundary surface forming the main portion for forming the bypass junction interface the supply lanes Supply in a molten state to the part ,
The supply of the lane, also supply the other synthetic resin material molten state, without merging into one of the synthetic resin material described above, the downstream side of the supply unit, the other of synthetic resin material, After passing through the partition wall-shaped detour joint boundary surface forming auxiliary portion, which is connected to the detour joint boundary surface forming main portion and formed on both sides with the shape for forming the detour joint boundary surface, Hard and soft co-extrusion of synthetic resin material, characterized in that by joining together with a synthetic resin material, a bypass joint interface having a larger joint area than the thickness of the hard and soft co-molded product is formed in the hard and soft co-molded product. Molding method. In claim 1,
A method of hard and soft coextrusion molding of a synthetic resin material, wherein the detour joint interface is a slope. In claim 1,
The detour joint boundary surface is a curved surface, and is a method of coextruding hard and soft synthetic resin materials. In claim 1,
A method of co-extrusion molding of a synthetic resin material, wherein the detour joint interface is a folded surface. In claim 1,
A method for co-extrusion of hard and soft synthetic resin material, wherein the detour joint interface is a male and female real structural surface. A rain gutter formed by the method of coextruding a soft and soft synthetic resin material according to any one of claims 1 to 5.

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