JPS6234544B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a thick asphalt sheet in which a thickly woven synthetic fiber nonwoven fabric is impregnated with asphalt, or a thick asphalt sheet in which both the front and back sides are impregnated with different asphalt.

Asphalt sheet, which is a type of waterproof material conventionally known as asphalt roofing, is made by making a raw fabric by paper-making waste cotton, etc., or by creating a raw fabric using short synthetic fibers, and then asphalt is applied to this. Asphalt roofing was formed by impregnating it with However, as this asphalt roofing is approximately 1mm thick, it is weak against tension, etc., and cannot follow cracks in the underlying concrete, causing it to tear.It takes two or three layers to form a complete waterproof layer. It was required that the material be overlaid.

In order to eliminate these material disadvantages and the disadvantages of complicated work, we used endless long-fiber synthetic fibers to create a nonwoven fabric with a thickness of approximately 6 mm using the needle punch method or glue. Asphalt sheets were developed by impregnating asphalt with asphalt. As mentioned above, this asphalt sheet is 3 to 4 times thicker than conventional asphalt roofing, and because it uses a raw material formed by entangling endless fibers, it is strong against tension. Not only is it expected to be completely waterproof because it has characteristics that allow it to sufficiently follow large cracks that occur in the underlying concrete layer, but it is also thick enough to achieve the purpose of waterproofing even with just one layer applied. It is. However, it is not easy to completely impregnate a thick raw non-woven fabric with high viscosity asphalt, and the applicant devoted himself to this research and used a roll with needle-shaped protrusions on the tip to open it on the non-woven fabric surface. We have developed a method in which asphalt is impregnated by drilling holes, or by using a deep asphalt melting tank and utilizing temperature and liquid pressure differences. However, these methods have the disadvantage that the speed is slow and the production efficiency is not as high as expected, and that all of them use an asphalt melting tank, resulting in large-scale equipment.

The present invention was made in order to eliminate the above-mentioned inefficient manufacturing method, and a pair of heated press rolls are provided in multiple stages, a nonwoven fabric is inserted through these, and the opposite Molten asphalt is stored in a recess formed by a pair of press rolls to impregnate the raw fabric layer with asphalt to produce an asphalt sheet, or one of the top press rolls of a multi-stage press roll is used. The molten asphalt is stored in the recess formed by the original fabric sheet, and the upper stage is placed in the recess formed by the original fabric sheet and the pressing roll on the opposite side of the upper stage of the pair of press rolls in the next stage. The present invention provides a method for producing an asphalt sheet, in which asphalt and molten asphalt and molten synthetic resin material different from each other are impregnated from both the front and back sides of the original sheet.

Embodiments of the invention will be described in detail with reference to the accompanying drawings:
FIG. 1 shows a nonwoven fabric 1 impregnated with the same asphalt 3 from both sides at the same time.
A pair of heated press rolls 2, 2 are provided in series in multiple stages. In the figure, there are three stages 2' and 2'', but there may be four or more stages.Then, the raw nonwoven fabric 1 is inserted between each roll. As shown in the figure, the pressure rolls 2'', 2'' in the lower stage are directly opposed to each other only by heat pressing, and the molten asphalt 3 is stored in the recess formed by the facing portion of each roll in the upper stage and the original fabric sheet 1. be.

When the hot press rolls 2, 2', 2'' are configured in this way and the nonwoven fabric sheet 1 is moved downward, the molten asphalt 3 is sequentially transferred to the upper press roll 2 and the next press roll. 2′ penetrates into the inside of the fabric, and then the lowest pressure roll 2″
The asphalt sheet A is obtained by pressing the asphalt sheet to completely impregnate the original fabric layer. The asphalt used here may be any of blown asphalt, modified asphalt, and rubber asphalt.

Figure 2 shows a non-woven fabric 1 impregnated with asphalts 3 and 4 of different nature from both the front and back sides, in which only one layer of thick asphalt sheet is used, and two layers have different properties against tension, tearing or cutting. This figure shows an example of manufacturing an asphalt sheet having characteristics similar to those of the above asphalt sheets laminated together.

In the figure, the pair of heated press rolls 2 are 2',
The nonwoven fabric material 1 is inserted between each of these press rolls. Move it downward.

As shown in the figure, the pressure roll 2'' on the lowest stage is directly opposed to the other using only a heat press, and the pressure roll 2'' on the top stage
molten asphalt 3 is stored in a recess formed between one of the rolls 2 and the nonwoven fabric material 1,
Molten asphalt 4, which is different from the asphalt above, is stored in a recess formed between the upper roll 2 and the roll 2' in the other direction of the next stage press roll 2' and the nonwoven fabric raw fabric 1. If there are five pressure rolls, this combination is repeated.

When the hot press rolls 2, 2', and 2'' are configured in this way to move the nonwoven fabric 1 downward, the molten asphalt 3 is released from the uppermost press roll 2 onto the nonwoven fabric 1. It is impregnated only from one side and transferred to the next stage press roll 2', and from this press roll 2', the surface of the unimpregnated layer of the nonwoven fabric raw material 1 is impregnated with foreign molten asphalt 4, and then the lowermost stage press roll 2 '' to obtain an asphalt sheet A' completely impregnated with different asphalt on both sides.

The asphalt used here may be blown asphalt, modified asphalt, rubber asphalt, or synthetic resin, and the combination thereof may be changed.

In the method for producing a thick asphalt sheet according to the present invention, the impregnation hot press rolls are provided in multiple stages, so even if the raw nonwoven fabric has a considerable thickness, the infiltration is completely carried out over several stages. Furthermore, since it is hot pressed using the lowest pressure roll, there is no chance of uneven impregnation. Furthermore, the forming speed is carried out while the original fabric is in progress, and has the effect of forming at a speed several times faster than the conventional method of immersing it in a melting tank.

Example 1 (According to the method shown in Figure 1 of the attached drawing) The raw nonwoven fabric used endless long fibers of polypropylene fibers, had a thickness of 5 mm, and had a needle punch count of 5 mm.
140/cm ² , asphalt for impregnation has a softening point of 95℃,
Bronze asphalt with a penetration level of 35 was used. The temperature of the molten asphalt is 150°C.

Each pressure roll is a metal roll with a diameter of 20 cm and has a built-in heater inside. The surface temperature of this roll is adjusted to be maintained at 160°C, and a roll length of 2 m is used, matching the width of the original fabric. The amount of asphalt stored on one roll is 12 kg, and it will be added sequentially.

Asphalt sheet A obtained by installing pressure rolls in three stages, setting the roll pressure of each pressure roll to 30Kg/ ^cm2 , and feeding the raw nonwoven fabric at a speed of 14m/min.
cut it and observed its cross section using an electron microscope, and found that it was completely impregnated with asphalt to the core.

Example 2 (According to the method shown in FIG. 2 of the drawing) The shape, roll pressure, and surface temperature of the press rolls were those of Example 1, and the rolls were arranged in three stages. 6 kg of molten blown asphalt was loaded on one of the uppermost pressure rolls, and 6 kg of rubber asphalt with a softening point of 105℃ and a penetration of 37 was loaded on one of the next pressure rolls, and the temperature was set to 155℃. I kept it. The nonwoven fabric was a 6 mm thick fabric fabricated by the needle punch method, and the feeding speed was 12 m/min. The obtained asphalt sheet A' was cut and its cross section was observed using an electron microscope, and it was confirmed that the asphalt was impregnated almost evenly from the other side and completely penetrated to the core.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the method of the invention, and FIG. 2 shows another embodiment. 1... Original nonwoven fabric, 2... Heating press roll,
3, 4... Molten asphalt.

Claims (1)

[Scope of Claims] 1. A pair of heated press rolls is provided in multiple stages of three or four stages in series, and a thickly woven synthetic fiber nonwoven fabric raw material is introduced from above into the heated press rolls, A method for producing a thick asphalt sheet, characterized in that molten asphalt is accumulated on the upper press rolls except for the lowest press roll, and asphalt is impregnated into the raw nonwoven fabric as it passes through. 2 A pair of heated press rolls are arranged in series in multiple stages of three or five odd stages, and a thickly woven synthetic fiber nonwoven fabric is introduced from above to the heated press rolls, and the bottom stage is The molten asphalt is accumulated on one of the uppermost press rolls, excluding the press roll, and the molten asphalt from the upper stage, such as molten synthetic resin, is placed on the roll on the opposite side of the next press roll. If there are five heat press rolls, this is repeated and the different waterproofing material is impregnated from both the front and back sides of the nonwoven fabric as it passes through. Features: A manufacturing method for thick asphalt sheets.