JPH0462025A - Manufacture of core-reinforced resin eaves-gutter - Google Patents

Abstract

PURPOSE:To enable a reinforced core material to be extrusion-covered uniformly with thermoplastic resin, and moreover strengthen the edge part of a eaves-gutter by folding the side peripheral part of a reinforced core material into a sleeve or loop form and turning it back to be a double-layered shape, and extrusion-covering the surface of an eaves-gutter shaped reinforced core material laminated on the reinforced core material of an eaves-gutter main body with thermoplastic resin. CONSTITUTION:An adhesive agent-applied reinforced core material 10 is allowed to pass through a heating path 60 and heated to be softened, and molded by a heat forming device 61 into an eaves-gutter comprising an eaves-gutter edge part and an eaves-gutter main body. In this case, the reinforced core material 11' of a one side eaves-gutter edge part 41 is folded along the longitudinal direction in its one side peripheral part of the reinforced core material 10 and made into a sleeve, and the terminal peripheral part 11'' is laminated on the reinforced core material 10 of the eaves-gutter main body. The reinforced core material 10' of the other side eaves-gutter edge part 40 is formed such that the other side peripheral part of the reinforced core material 10 is folded back to be a double layered form for forming a hollow loop in its tip peripheral part 10'' and the terminal peripheral part 10'' is laminated on the reinforced core material 10 of the eaves-gutter main body 30. The eaves-gutter molded reinforced core material 10 is introduced into the cross-head mold 70 of an extruder 71, and the surface of the reinforced core material 10 is extrusion-covered with a thermoplastic resin 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a core-reinforced resin eaves gutter in which a reinforcing core material is extrusion coated with a thermoplastic resin.

(Prior technology) A reinforcing core material in the shape of an eave gutter, consisting of a gutter ear and a gutter body, is introduced into a crosshead mold of an extruder, and its surface is extruded and coated with thermoplastic resin to form a core reinforced resin eave. Methods of manufacturing gutters are known.

In this type of method for manufacturing eaves gutters, the reinforcing core material of the gutter ears is bent into a groove shape, and a thermoplastic resin is extruded and coated on the surface of the reinforcing core material. Eaves gutters manufactured by such conventional methods are
There are cases where the gutter ear portion 4 is formed into a groove shape as shown in Figure (A), and cases where the gutter ear portion 4 is formed into a cylindrical shape as shown in Figure 4 (B). Note that 1 is a reinforcing core material, 2 is a thermoplastic resin coated on both sides of the reinforcing core material 1, and 3 is a gutter main body.

In the former case, the gutter is generally attached by inserting the locking piece of the gutter hanging fitting from above into the groove of the gutter ear so that the eaves gutter is suspended from above. In the latter case, the gutter holder is generally supported from the outside by a metal fitting, and the gutter holder is attached by pinching the cylindrical part of the gutter ear with the clamping piece of the metal fitting and holding it down with a screw.

(Problem to be Solved by the Invention) However, in the conventional manufacturing method of core-reinforced resin eaves gutters, the reinforcing core material of the gutter ears is melted and extruded on the inside and outside of the reinforcing core material in the crosshead mold. This creates a pressure difference in the resin, which causes the reinforcing core material to become biased, resulting in backflow, uneven thickness of the coating resin at the gutter ears, and smooth contact between the reinforcing core material and the crosshead mold. There are molding problems such as not being able to extrude properly.

In addition, in the core-reinforced resin eaves gutters manufactured by such a method, the reinforcement of the gutter ears, particularly in the vicinity of the end edge of the reinforcing core material, is insufficient. Therefore, when eaves gutters are exposed to direct sunlight and become hot, the gutter ears may open or deform, or the gutter hanging fittings or gutter holders attached to the gutter ears may come off. , and the function of the gutter ears is not fully demonstrated. Additionally, if dropped from a height during construction, the gutter ears may crack.

The present invention is intended to solve the above-mentioned problems, and its purpose is to perform smooth extrusion, uniformly extrusion coat the thermoplastic resin on the reinforcing core material of the gutter ears, and to An object of the present invention is to provide a method for manufacturing a sufficiently reinforced core-reinforced resin eaves gutter.

(Means for Solving the Problems) A method for manufacturing a core-reinforced resin eaves gutter according to the present invention includes introducing a reinforcing core material in the shape of an eave gutter, which is composed of a gutter ear portion and a gutter body portion, into a crosshead mold of an extruder. In the method of manufacturing core-reinforced resin eaves gutters by extruding and coating the surface with thermoplastic resin, the reinforcing core material of the gutter ears is made by (1) bending the side edges of the strip-shaped reinforcing core material; (2) The side edge of the belt-shaped reinforcing core material is formed so that a loop is formed at the tip edge of the reinforcing core material. The reinforcing core material for the gutter ears in the crosshead mold is
It is characterized by being supported by an elongated core inserted from the outside into the cylindrical hollow part or loop-shaped hollow part, thereby achieving the above object.

Hereinafter, the method of the present invention will be explained in detail with reference to the drawings.

Fig. 1 is a schematic diagram showing an example of the method of the present invention, and Fig. 2 is a schematic diagram showing an example of the method of the present invention.
FIG. 3 is a longitudinal sectional view of the crosshead mold shown in the figure, and FIG. 3 is a sectional view taken along line XX in FIG.

In FIG. 1, reference numeral 10 denotes a belt-shaped reinforcing core material, and this reinforcing core material 10 is generally made of a large number of rovings such as glass fiber, nonwoven fabric, woven fabric, net, etc., and thermoplastic resin such as vinyl chloride resin. It is made by impregnating it with a thermosetting resin such as unsaturated polyester resin.

First, the reinforcing core material 10 in the form of a strip is unwound from the rolled body, and the coating machine 50 applies adhesive to both side edges of the reinforcing core material 10 along the longitudinal direction. Examples of adhesives include acrylic, ethylene-vinyl acetate copolymer (EVA), polyester, styrene-butadiene-styrene block copolymer (SBS), and styrene-isoprene-styrene block copolymer (SI S ) type hot melt adhesives are preferably used.

When using a hot melt adhesive, in addition to the method of applying with the coating machine 50, a method of heat-pressing a band-shaped hot melt adhesive can also be adopted. In addition, curable adhesives, emulsion adhesives, and solvent adhesives can also be used.

In this example, an adhesive is used as described above, but if the reinforcing core material itself has thermal adhesive properties, the reinforcing core material can be bonded to the reinforcing core material by heat without using an adhesive as described above. The terminal edge of the gutter is laminated and bonded to the reinforcing core material of the gutter body. So no adhesive is needed. Note that it is not essential that the terminal edge of the reinforcing core material be adhered to the reinforcing core material of the gutter main body, and it is sufficient that they are simply overlapped. However, it is desirable that the terminal edge of the reinforcing core material be laminated and bonded to the reinforcing core material of the gutter body.

In the present invention, "lamination" means both of the above meanings.

The reinforcing core material 10 coated with the adhesive is passed through a heating furnace 60, and if the core material is impregnated with a thermoplastic resin, it is heated here to such an extent that the reinforcing core material 10 is softened. Subsequently, the softened reinforcing core material 10 is passed through a heating forming device 61 composed of an upper die and a lower die for shaping, or a large number of rollers for shaping, where the gutter ears and the gutter body are separated. It is shaped into a gutter-like shape consisting of parts.

In this case, as shown in FIG. 4, the reinforcing core material 11' of the gutter ear portion 41 on one side is formed by bending one side edge of the reinforcing core material 10 along the longitudinal direction to form a cylindrical shape. It is formed by laminating the edge portion 11 on the reinforcing core material 10 of the gutter body portion 30. In addition, the reinforcing core material 10゛ of the gutter ear portion 40 on the other side is
The other side edge of the reinforcing core material 10 is folded back along the longitudinal direction so that a hollow loop is formed at the leading edge io"', and the final edge 10" is folded over the end of the gutter body 30. It is formed by laminating the reinforcing core material 10.Although the folded and doubled portions may simply be overlapped, it is preferable that they be bonded to each other.

When forming the reinforcing core material 10 into an eaves gutter shape using the heating forming device 61, as shown in FIGS. - The elongated cores 62 are inserted into the cylindrical hollow part of the reinforcing core material of the gutter ear part and the loop-shaped hollow part of the folded and doubled tip edge in the mold 70. This elongated core 62 is made to have a cross-sectional shape similar to the cylindrical and loop-shaped reinforcing core material of the gutter ear, and is fixed externally by suitable fixing means, for example near the entrance of the heating forming device 61. , the heating forming device 61 and the crosshead mold 70 are reliably set at predetermined positions.

Then, the both side edges of the reinforcing core material 10 are transferred so as to be wrapped around this elongated core 62, and when the gutter ear portion is formed by the heating forming device 61, the terminal edge portion 10'' of the reinforcing core material 10'' is transferred. and 11'' are pressed against the reinforcing core material 10 of the gutter body.The adhesive applied to the reinforcing core material 10 or the resin impregnated in the reinforcing core material 10 is softened by heat from the heating forming device 61. , so that the terminal edges 10'' and 11'' of the reinforcing core material are connected to the reinforcing core material 10 of the gutter body.
There are cases in which they are laminated and bonded, and cases in which they are simply overlapped but not bonded.

The reinforcing core material 10 shaped into the eaves gutter shape in this way is introduced into the crosshead mold 70 of the extruder 71, where thermoplastic resin is applied to the surface of the reinforcing core material 10 shaped into the eaves gutter shape. 2
0 is extrusion coated. In this case, as shown in Figure 3,
With the cylindrical hollow part and the loop-shaped hollow part of the reinforcing core material of the gutter ear part being supported by the elongated core 62, the thermoplastic resin 20 is extruded and coated on the surface. As the material, resins with good weather resistance such as vinyl chloride resin, acrylic resin, and nylon resin are preferably used.

The crosshead mold 70 has a slit shaped like an eave gutter, as shown in FIG. 2, and a semi-finished product of the eave gutter 100, in which the surface of the reinforcing core material 10 is coated with the thermoplastic resin 20, is drawn out from this slit. Ru. The length of the land portion of the crosshead mold 70 is appropriately determined depending on the extrusion temperature, extrusion speed, resin used, etc., and the gap between the slits is also designed to have a desired eave gutter shape.

Note that 72 is a resin passage of the crosshead mold 40;
The thermoplastic resin 20 is extruded from this resin passage 72, and as a result, the thermoplastic resin is extruded onto the surface of the eaves gutter-shaped reinforcing core material 10 (see FIG. 3) consisting of the gutter ears and the gutter body. 20 is extrusion coated.

Pressure of the molten resin is applied to the reinforcing core material 10 of the gutter ear part in the crosshead mold, and the terminal edges 10'" and 11" of the reinforcing core material are pressed against the reinforcing core material 10 of the bridge main body,
Normally, the adhesive melts at this point, thereby laminating and bonding the terminal edges 10' and 11' of the reinforcing core to the reinforcing core 10 of the bridge body. However, as mentioned above, the terminal edge 1 of the reinforcing core material
It is not essential to bond 0' and 11'' to the reinforcing core material 10 of the gutter body (they may simply be overlapped).

However, it is desirable to adhere the terminal edges 10'' and 11'' of the reinforcing core to the reinforcing core 10 of the gutter body.

A semi-finished product of the eaves gutter 100, which is formed by extrusion coating the thermoplastic resin 20 on the surface of the eave gutter-shaped reinforcing core material 10, is led out from the slit of the crosshead mold 70, and then sized using a cooling mold, etc. It is passed through apparatus 80 where it is surface finished and cooled. Thereafter, it is taken up by a tensioning device 90 such as a caterpillar tensioning machine, and cut into a certain length by a cutting machine to manufacture the eaves gutter 100.

Note that the thermoplastic resin 2 coated on the surface of the reinforcing core material 10
If the adhesiveness of the reinforcing core material 10 is poor, an adhesive is applied to the entire surface of the reinforcing core material 10. Furthermore, by extending the terminal edges 10'' and 11'' of the reinforcing core material 10 to the bottom of the gutter body section 30, the reinforcing core material 10 in this portion may be formed double and strengthened.

In the above example, the gutter ears 41 on one side were formed into a cylindrical shape and the gutter ears 40 on the other side were formed into a groove shape, but the gutter ears 40 on both sides
．． 41 may be formed into a cylindrical shape, and the gutter ears 40 on both sides may be formed into a cylindrical shape.
．． 41 may be formed into a groove shape.

As in the above example, if the gutter ear part 41 on one side is formed into a cylindrical shape and the gutter ear part 40 on the other side is formed into a groove shape, there are two methods: mounting with a gutter hanger and gutter holder with a metal fitting. It is convenient because either mounting method can be used.

(Function) The side edges of the reinforcing core material are bent to form a cylindrical shape, or the tip edge is folded back to form a loop, making it double, and the final edge is attached to the reinforcing core material of the gutter body. When the gutter-shaped reinforcing core material, which is laminated to form gutter ears, is introduced into the crosshead mold of an extruder and the surface is extruded and coated with thermoplastic resin, the terminal edge of the reinforcing core material is formed by resin pressure. Since it is strongly pressed against the reinforcing core material of the gutter main body, and in some cases is bonded, the reinforcing core material in this part is prevented from shifting.

Moreover, at this time, if the reinforcing core material of the gutter ear part in the crosshead mold is supported by an elongated core inserted from the outside into the cylindrical hollow part or loop-shaped hollow part, the reinforcing core material of the gutter ear part will be The thermoplastic resin is moved by the resin pressure within the crosshead mold and is not biased, so that the thermoplastic resin is evenly and smoothly extruded and coated on the surface of the gutter selvage.

In addition, in the obtained eaves gutter, the reinforcing core material of the gutter ear part is formed into a cylindrical shape or is folded back so as to form a loop at the tip edge to form a double layer, and the end edge of the reinforcing core material is formed in the gutter body. Since it is laminated to the reinforcing core material of the gutter body and integrated with the reinforcing core material of the gutter body, the gutter ears are sufficiently strengthened compared to conventional eaves gutters.

(Example) Examples and comparative examples of the present invention are shown below.

1旌■1 In this example, the eaves gutter shown in FIG. 4 was manufactured by the method shown in FIGS. 1 to 3.

First, a large number of glass rovings (14400: Nittobo Co., Ltd.) are arranged in the longitudinal direction and introduced into a fluidized bed, where they are defibrated and blown up by pressurized air to remain in a floating state. Chemical) was fluidized and impregnated, passed through a heating furnace and heated to 180°C, and then passed through a pair of heated pinch rolls with a surface temperature of 180°C and thermocompressed to completely melt the resin blend powder. A reinforcing core material in the form of a belt with a thickness of approximately 0.4 m, a width of 300 m, and a glass roving content of 30% by volume was prepared.

An EVA-based hot melt adhesive is applied to both side edges of this strip-shaped reinforcing core material at 170°C to a thickness of 50 μm, passed through a heating furnace to soften it by heating to 80°C, and then processed using a heating forming device. It was formed into a gutter shape consisting of a gutter ear and a gutter main body as shown in Figure 4 and cooled.

At this time, two elongated cores, left and right, were inserted into the crosshead mold from the outside through the formation position of the gutter lugs in the heat forming device, and their rear ends were fixed to the entrance portion of the heat forming device. Both side edges of the strip-shaped reinforcing core material are transferred so as to be wrapped around each elongated core, and when the gutter ears are shaped by the heating forming device, the end edges of the reinforcing core material are wrapped around the gutter main body. Laminated with reinforced core material.

Subsequently, a reinforcing core material shaped like an eaves gutter is introduced into the crosshead mold, and one portion of the vinyl chloride resin compound is applied to the surface of the reinforcing core material.
The coating was melt extruded to a thickness of about 0.4 mm at 85°C. In this case, the cylindrical hollow part of the reinforcing core material of the tool part and the loop-shaped hollow part of the folded and doubled tip edge are supported by the elongated core and are smoothly transferred inside the crosshead mold. This was then uniformly extrusion coated with a vinyl chloride resin formulation.

Then, the EVA-based hot melt adhesive was melted in the crosshead mold, and the terminal edge of the reinforcing core material was adhered to the reinforcing core material of the gutter body with this adhesive. In this way, a square eaves gutter semi-finished product having a cylindrical fixture part on one side and a groove-shaped fixture part on the other side as shown in FIG. 4 was formed.

Next, the surface was finished using a sizing device, cooled, and pulled out using a tensioning machine to manufacture eaves gutters. The line speed was 3 m/min. In this eaves gutter, the coating resin layer covering the reinforcing core material of the equipment part was coated with a uniform thickness like the coating resin layer of the gutter main body part.

This eaves gutter was cut to a length of 4 m to make a test piece, and this was
After leaving the device open for 5 hours at 0° C., the state of thermal deformation of the device portion was observed, and the thermal deformation of the device portion was extremely small. In addition, a 4m long eaves gutter can be set vertically and 2
When an impact test was performed by dropping the product from above, no abnormality was found in the equipment.

In addition, the cylindrical equipment part of the 23I111+ gutter holder on one side was clamped with the clamping piece of the metal fitting, held down with a screw, and attached, and this was pulled to measure the tensile strength between the eaves gutter and the gutter hanging metal fitting. The tensile strength was 75 kg, which was strong. Similarly, we inserted and attached the locking piece of the gutter hanging fitting of Tsuji 23 Kaku into the groove-shaped device part on the other side, and when we pulled it and measured the tensile strength between the eaves gutter and the gutter hanging fitting, the tensile strength was It was powerful at 75kg.

Implementation [The EVA hot melt adhesive was not applied to both side edges of the reinforcing core material in the form of a strip, but otherwise the same procedure as in Example 1 was carried out. In this case, the vinyl chloride resin in the reinforcing core material melts in the crosshead mold, and this vinyl chloride resin causes the final edge of the reinforcing core material to adhere to the reinforcing core material in the gutter body (there may be gaps in some parts). had) been done. In addition, the cylindrical hollow part of the reinforcing core material of the tool part and the loop-shaped hollow part of the folded and doubled tip edge are smoothly transferred within the crosshead mold while being supported by the elongated core. , which was uniformly extrusion coated with a vinyl chloride resin formulation.

Regarding this eaves gutter, the state of thermal deformation was observed in the same manner as in Example 1, and it was found that the thermal deformation of the equipment part was very small. In addition, no abnormalities were found in the equipment during impact tests due to drops. Furthermore, the tensile strength between the metal fittings of the eaves gutter and gutter holder, and the tensile strength between the eaves gutter and gutter hanging fittings was 60 kg, which was strong.

As shown in Figure 2 (a), the reinforcing core material of the tool part on one side was formed so as to overlap. Further, as shown in FIG. 2(b), the reinforcing core material of the other tool part was molded so that its terminal edge was slightly separated within the tool part. Other than that, the same procedure as in Example 2 was carried out. In this case, the shaped reinforcing core material was non-uniformly extruded and coated with a vinyl chloride resin compound on both sides.

Regarding the twenty-eight gutter, the state of thermal deformation was observed in the same manner as in Example 1, and it was found that the thermal deformation of the equipment part was larger than that in Example 1. In addition, cracks were observed in the equipment part of the impact test due to dropping. Furthermore, the tensile strength between the eaves gutter and the gutter holder was 40 kg, and the tensile strength between the eave gutter and the gutter hanging metal fitting was 40 kg.

(Effects of the Invention) As described above, according to the method for manufacturing core-reinforced resin eaves gutters of the present invention, the reinforcing core material of the equipment part does not move and shift due to resin pressure within the crosshead mold, and the back Smooth extrusion is performed without any flow, and the reinforcing core material of the tool part is evenly extruded and coated with thermoplastic resin.

In addition, the core-reinforced resin eaves gutter obtained by the method of the present invention is
The equipment will be sufficiently strengthened. Therefore, even when used in high-temperature environments exposed to direct sunlight, the equipment will not be deformed, the opening of the equipment or the gutter holder will not cause the metal fittings or the gutter hanging metal fittings to come off, and it will not be affected by the impact of falling from a high place. It is also strong (and can fully demonstrate the function of the equipment part.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an example of the method of the present invention, and Fig. 2 is a schematic diagram showing an example of the method of the present invention.
FIG. 3 is a longitudinal sectional view of the crosshead mold shown in the figure, FIG. 3 is a sectional view taken along line XX in FIG. 2, FIG. is a partially cutaway vertical sectional view showing an eaves gutter obtained by a conventional method. 10...Reinforcement core material, 10゛...Double reinforcement core material, 1
0″...Reinforcing core material at the end edge, 101″...Loop-shaped reinforcing core material, 11″...Cylindrical reinforcing core material, 11″'・
・・Reinforcing core material of the terminal edge, 20 ・・Thermoplastic resin, 30
...Gutter body part, 40...Equipment part on the other side, 41...
Equipment section on one side. 50... Coating machine, 60... Heating furnace,
61... Heat forming device, 62... Elongated core, 70... Crosshead mold, 72... Resin passage of crosshead mold, 80... Sizing device, 9
0... Collection device.

Claims (1)

[Claims] 1. A reinforcing core material in the shape of an eaves gutter consisting of a gutter ear portion and a gutter body portion is introduced into a crosshead mold of an extruder, and a thermoplastic resin is extruded and coated on the surface of the core material. In the method for manufacturing reinforced resin eaves gutters, the reinforcing core material for the gutter ears is: (1) The side edges of the strip-shaped reinforcing core material are bent to form a tube, and the final edge is used as the reinforcing core material for the gutter body. (2) The side edges of the strip-shaped reinforcing core material are folded back so that a loop is formed at the tip edge to form a double layer, and the final edge is formed as the gutter main body. The reinforcing core material of the gutter ears in the crosshead mold is formed by laminating it on the reinforcing core material of
A method for manufacturing a core-reinforced resin eaves gutter, characterized in that it is supported by an elongated core inserted from the outside into the cylindrical hollow part or loop-shaped hollow part.