JPS6114303B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a synthetic resin roof base material having heat insulating performance.

[Background technology]

Conventionally, asphalt roofing and the like have been mainly used as roof base materials, but roof base material A consists of roofing boards 13 and tiles 1 as shown in Figure 1.
Since the tiles 14 are installed so as to be sandwiched between the roof tiles 14 and the hanging bars 15 on which the tiles 14 are placed, rainwater that has entered from the tiles 14 is blocked by the hanging bars 15 that are long in the direction perpendicular to the slope of the roof, and the rainwater is collected here. 15 and roof boards 1, which accumulates and causes rain leaks.
In addition, this roof base material A does not have any heat insulation performance, and there is also a problem in this respect.

Therefore, in order to solve the problems of rainwater damming and heat insulation, it is possible to use roof base material A provided in Japanese Utility Model Publication No. 51-48506. As shown in FIG. 2, this product is made by stacking a paper sheet 30 and a foam sheet 31 and bonding both sheets 30 and 31 along vertical and horizontal lines.
A sealed bubble chamber 3 is formed between 0 and 31. In this case, the glued portion becomes a water channel 4, allowing rainwater to flow down without being blocked by the hanging bar 15, and the bubble chamber 3 provides heat insulation performance. It is. However, in this case, the paper sheet 30 has insufficient water resistance, and while the bubble chamber 3 has sufficient heat insulation performance, it is necessary to further provide heat insulation performance with the foam sheet 31, which is generally expensive. This results in excessive quality and is disadvantageous in terms of cost.

Here, it is considered that it is preferable to use synthetic resin sheets in place of the paper sheet 30 and the foam sheet 31 in the roof base material A of Japanese Utility Model Publication No. 51-48506 in terms of water resistance and cost. In manufacturing the roof base material having the structure of the air bubble chamber 3 and the running water groove 4 using synthetic resin sheets,
Similar to what is described in Publication No. 48506, 2
Two synthetic resin sheets are stacked and both synthetic resin sheets are adhered along vertical and horizontal lines, and the bonded portion is formed as a water flow groove 4, and a bubble chamber 3 is formed between the synthetic resin sheets in the area surrounded by the water flow groove 4. It will be done. However, this manufacturing method involves two steps: first, a synthetic resin sheet is formed by extrusion, and then the two formed synthetic resin sheets are stacked one on top of the other and bonded together. Therefore, a problem arises in that the number of man-hours for molding increases.

[Purpose of the invention]

The present invention has been made in view of the above points, and provides a roof that can be manufactured with fewer man-hours through a series of extrusion molding processes of a synthetic resin roof base material having a structure having bubble chambers and water channels. The object of the present invention is to provide a method for manufacturing a base material.

[Disclosure of the invention]

Therefore, in the method for manufacturing a roof base material according to the present invention, the molten synthetic resin is melted using an extrusion die 8 having an upper slit 5 and a lower slit 6 that are vertically parallel, and a plurality of connecting slits 7 that connect the upper and lower slits 5 and 6. 9 is extruded and compressed air is blown between the connecting slits 7 to form a hollow extruded product 11 having a plurality of hollow chambers 10 parallel to the extrusion direction. Next, before the hollow extruded product 11 is cooled, Press the hollow extruded product 11 from above and below at predetermined intervals in a direction perpendicular to the extrusion direction,
A water flow groove 4 extending in the width direction of the hollow extruded product 11 is formed on the surface, and by forming the water flow groove 4, the portion pushed out from the upper slit 5 and the portion pushed out from the lower slit 6 are fused together to form a hollow chamber. 10 is divided into a large number of independent bubble chambers 3, and by extrusion molding of the hollow extrusion product 11 and subsequent pressing, the bubble chambers 3 and water flow grooves are separated in a series of extrusion molding steps. The present invention will be described below in detail with reference to Examples.

FIG. 3 shows an apparatus used in the present invention, in which a mandrel 18 is attached to a die body 17, and an upper slit 5, a lower slit 6, and an upper and lower slit 5,
An extrusion die 8, as shown in FIG. Further, a compressed air supply pipe 20 is connected to the mandrel 18, and the compressed air supply path 21 in the mandrel 18 is connected to each connecting slit 7, at the tip of the extrusion die 8.
It is opened between 7 and 7. A lower roller 22 and an upper roller 23 are disposed in front of the extrusion molding machine 19, and pressure ribs 24 are protruded from the upper roller 23 at regular intervals. 25 is a cooling die through which water is passed.

However, when manufacturing the roof base material A using such a device, first the molten synthetic resin 9 such as polyvinyl chloride or polyethylene is extruded from the extrusion die 8, and at the same time compressed air is injected from the tip of the mandrel 18. The upper soft synthetic resin sheet 1 is blown out through the upper slit 5, the upper soft synthetic resin sheet 2 is connected through the lower slit 6, and the connecting piece 16 connects the upper and lower soft synthetic resin sheets 1 and 2 through the connecting slit 7.
are formed respectively, and a hollow extruded product 11 having a plurality of hollow chambers 10 formed in parallel in the extrusion direction as shown in FIG. 6 is extruded. Next, before this hollow extruded product 11 is cooled down, the upper and lower rollers 2
2 and 23, press the upper surface of the hollow extruded product 11 with the pressure rib 24 as shown in FIG. urge In this way, by bending the upper soft synthetic resin sheet 1 downward and fusing it to the lower soft synthetic resin sheet 2, the hollow chamber 10 is divided to form a large number of independent bubble chambers 3, and water can flow. This is to form the groove 4. Note that a press plate 26 as shown in FIG. 5b may be used instead of the upper and lower rollers 22, 23.

In this way, a large number of independent bubble chambers 3 are formed between the upper and lower two soft synthetic resin sheets 1 and 2, as shown in FIG.
A roof base material A is continuously manufactured by extrusion molding, in which a plurality of parallel drainage grooves 4 extending over the entire length in the width direction are formed by bending downward. The roof base material A thus formed is laid on the roof board 13 so that the slope of the roof (in the direction of the arrow X) and the running water groove 4 are parallel, as shown in FIG. 15. Therefore, rainwater that has entered below the tiles flows down along the roof slope through the water gutter 4 without being stopped by the hanging beams 15.

The roof base material A shown in FIG. 8b is the one shown in FIG.
Both the upper and lower soft synthetic resin sheets 1 and 2 are bent and fused so that a A device with ribs 24 protruding is used.

〔Effect of the invention〕

As described above, in the present invention, while extruding the molten synthetic resin using an extrusion die having vertically parallel upper and lower slits and a plurality of connecting slits connecting the upper and lower slits, compressed air is injected between the connecting slits. A hollow extruded product with a plurality of hollow chambers parallel to the extrusion direction is formed by blowing into the roof base material, and then, before the hollow extrusion is cooled, the hollow extrusion is shaped in a direction perpendicular to the extrusion direction. Press from above and below at intervals to form running water grooves in the width direction of the hollow extruded product on the surface, and by forming these running water grooves, the part extruded from the upper slit and the part extruded from the lower slit are fused together. Since the hollow chamber is divided into a large number of independent bubble chambers, the hollow extruded product formed by an extrusion die having upper and lower slits and connecting slits can be pressed at predetermined intervals to form a hanging frame. It is possible to manufacture a roof base material that has drainage channels that prevent rainwater from being dammed up and independent bubble chambers that provide heat insulation performance, and the roof base material can be manufactured through a series of extrusion molding processes. It can be manufactured continuously with a small number of man-hours without requiring a two-step molding process.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a sectional view of another conventional example, Fig. 3 is a sectional view showing an example of an apparatus used in the present invention, and Fig. 4 is a part of an extrusion die used in the same. Fig. 5 a and b are a partially cutaway perspective view of a part of the same process, Fig. 6 is a partially cutaway perspective view of the hollow extruded product in the above, and Fig. 7 is an example of a roller used in the above. Figures 8a and 8b are partially cutaway perspective views of the roof base material manufactured by the above.
The figure is a partially cutaway enlarged perspective view of the roof underlayment in the construction state. 1 and 2 are soft synthetic resin sheets, 3 is a bubble chamber, 4
is a running water groove, 5 is an upper slit, 6 is a lower slit, 7
8 is a connecting slit, 8 is an extrusion die, 9 is a molten synthetic resin, 10 is a hollow chamber, and 11 is a hollow extruded product.

Claims (1)

[Claims] 1. While extruding the molten synthetic resin using an extrusion die having vertically parallel upper and lower slits and a plurality of connecting slits connecting the upper and lower slits, compressed air is blown from between each connecting slit,
A hollow extruded product with a plurality of hollow chambers formed parallel to the extrusion direction is extruded, and then, before the hollow extruded product is cooled, the hollow extruded product is pressed from above and below at predetermined intervals in a direction perpendicular to the extrusion direction. Then, a water flow groove extending in the width direction of the hollow extruded product is formed on the surface, and the formation of the water flow groove fuses the part pushed out from the upper slit and the part pushed out from the lower slit, thereby making the hollow chamber independent. A method for manufacturing a roofing base material, which is characterized by decomposing it into a large number of bubble chambers.