JPH08246358A - Laminated sheet for asphalt roofing - Google Patents

Abstract

PURPOSE: To obtain a laminated sheet for an asphalt roofing, having a high strength and elastic modulus and excellent in dimensional stability by laminating low shrinkable nonwoven fabrics to the front and back surfaces of an interlayer part comprising specific glass fibers, polyvinyl alcohol-based fibers or polyester fibers and integrating the fabrics with the interlayer. CONSTITUTION: This laminated sheet for an asphalt roofing is obtained by laminating low shrinkable nonwoven fabrics such as polyester-based spunbonded nonwoven fabrics to both the front and the back surfaces of an interlayer part formed by arranging glass fibers, polyvinyl alcohol-based fibers or polyester fibers having >=5g/d tensile strength, >=2g/d stress at 3% elongation and <=0.5% dry elongation in heat treatment at 180 deg.C for 10min in one direction or both the direction and a direction crossing the one, then carrying out the needle punching treatment, integrating the fabrics with the interlayer part and impregnating the integrated sheet with a mixed resin of urea/melamine with an acrylic ester, etc.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a laminated sheet used as a base fabric for asphalt roofing.

[0002]

2. Description of the Related Art In recent years, as a base fabric for asphalt roofing, a heat-pressed non-woven sheet, a needle-punched non-woven sheet and the like have been used. However, when the nonwoven sheet is used as a base fabric for asphalt roofing, the nonwoven sheet is stretched by the processing tension during the asphalt impregnation process and is commercialized while the strain remains. There was a problem that when it was installed, it was heated by sunlight and contracted. Since the roofing material does not exhibit the desired waterproof performance due to shrinkage, efforts have been made to eliminate such shrinkage.
In order to eliminate shrinkage, it is conceivable to eliminate elongation during the asphalt impregnation process or to make the constituent fibers of the non-woven sheet have stress against heat shrinkage.

Various proposals have been made to solve the above problems and improve the strength and elastic modulus, which are the drawbacks of conventional needle punched nonwoven sheets. For example, in Japanese Unexamined Patent Publication (Kokai) No. 51133583, a nonwoven web is subjected to needle punching from one side thereof, followed by heat setting, and then needle punching from the other side to suppress damage to the fiber due to needling, Moreover, a method of improving the entanglement of fibers to obtain a non-woven sheet having high strength and high elastic modulus has been proposed. Further, Japanese Patent Publication No. 60 25543 discloses that an oil agent is applied in advance to reduce needle penetration resistance and needle punch density is increased and needle entanglement is improved to improve fiber strength. A method of obtaining a non-woven sheet having a high elastic modulus has been proposed. However, all of these methods are intended to improve the entanglement between the fibers, and there is a limit to improving both the strength and the elastic modulus of the fibers, and the former method has a non-woven web. Since the needle punching process is performed twice from both sides, the process is complicated and the product cost is increased. In view of the performance required for the above-mentioned applications, both the strength and the elastic modulus are still insufficient, and a nonwoven sheet having sufficient dimensional stability has not been obtained.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a laminated sheet for asphalt roofing having high strength, high elastic modulus and dimensional stability. Is.

[0005]

As a result of intensive studies, the present inventors have found that in order to obtain a laminated sheet for asphalt roofing having high strength, high elastic modulus and dimensional stability, one direction or the above The inventors have found that it is possible to suppress the elongation during asphalt processing by inserting fibers having specific physical properties in a direction orthogonal to that, and have reached the present invention.

That is, the present invention comprises a glass fiber, a polyvinyl alcohol fiber, and a polyester fiber, and has a tensile strength of 5 g / d or more and a stress of 2 g at 3% elongation.
/ D or more, and a fiber having a dry heat shrinkage of 0.5% or less when heat-treated at 180 ° C. for 10 minutes, exists in one direction or in the direction and the direction intersecting with the intermediate layer part,
The nonwoven fabric laminated on both the front and back surfaces of the intermediate layer portion is entangled with the fibers constituting the nonwoven fabric on the front and back surfaces by needle punching, and the fibers are integrated by being entangled with the fibers constituting the intermediate layer portion. The gist is a laminated sheet for asphalt roofing, which is characterized by the following.

Further, the present invention comprises a glass fiber, a polyvinyl alcohol fiber, and a polyester fiber, the tensile strength is 5 g / d or more, the stress at 3% elongation is 2 g / d or more, and 180 ° C. for 10 minutes. A fiber having a dry heat shrinkage ratio of 0.5% or less during heat treatment existing in one direction or in the direction and a direction intersecting with the fiber, and a nonwoven fabric laminated on both front and back surfaces of the intermediate layer. Is entangled with the fibers constituting the nonwoven fabric on the front and back sides by needle punching, and the fibers are integrated by being entangled with the fibers constituting the intermediate layer portion, and the fibers are fixed by resin impregnation. The main feature is a laminated sheet for asphalt roofing, which is a feature.

Further, the present invention provides a laminated sheet for asphalt roofing, characterized in that the nonwoven fabric constituting the laminated sheet for asphalt roofing has a low shrinkage.

The present invention will be described in detail below. The intermediate layer portion of the present invention is composed of fibers made of a polyester polymer, a polyvinyl alcohol polymer or glass.

Examples of the polyester-based polymer include polyethylene terephthalate and polybutylene terephthalate having a fiber-forming property, or acid components such as phthalic acid, isophthalic acid, glutaric acid, adipic acid and sulfoisophthalic acid having these as main components, diethylene glycol, Examples thereof include copolymerized polyesters in which diol components such as propylene glycol, 2,2-bis (4-hydroxyethoxyphenyl) propane, bisphenol A, and polyalkylene glycol are copolymerized in the range of up to 15 mol%. In the case of these copolymers, it is usually difficult to improve the strength, and it is preferable to use the former polymer because it is necessary to take measures such as increasing the draw ratio when producing fibers.

As the polyvinyl alcohol polymer, polyvinyl alcohol having a fiber-forming property or ethylene, vinylpyrrolidone or other vinyl group is used.
A copolymerized polyvinyl alcohol or the like copolymerized in an amount of not more than mol%, preferably not more than 2 mol%, can be used. In the present invention, when the polyester-based polymer or polyvinyl alcohol-based polymer is used as the material of the fiber, the heat-resistant agent, stabilizer and the like which are usually used for fibers in the polymer are the effects of the present invention. Can be added as long as it does not deteriorate.

Further, the glass may be any one having ordinary fiber-forming properties.

The fiber constituting the intermediate layer portion of the present invention has a tensile strength of 5 g / d or more, a stress at 3% elongation of 2 g / d or more, and a dry heat shrinkage ratio of 0 when heat-treated at 180 ° C. for 10 minutes. It is less than 0.5%. The physical properties of the fibers constituting the intermediate layer portion of the present invention are such that the tensile strength is 5 g / d or more, the stress at 3% elongation is 2 g / d or more, and the dry heat shrinkage factor is 0.1 after heat treatment at 180 ° C. for 10 minutes. If it is not more than 5%, the dimension will not be stable due to thermal environmental factors such as sunlight irradiation when the roofing material obtained using the laminated sheet of the present invention is applied.

In the intermediate layer portion of the present invention, the constituent fibers are
It is necessary to exist in one direction or the above-mentioned direction and a direction intersecting with the above-mentioned direction. When the fibers forming the intermediate layer portion are present in one direction, it is preferable that the distance is 3 to 30 mm.

When the fibers constituting the intermediate layer portion are present in one direction and in a direction intersecting with the one direction, the fibers may be arranged or knitted, but the dimensional stability of the laminated sheet may be improved. It is preferable to knit a net from the side. The existing state includes an orthogonal shape in which the fibers are orthogonal to and intersecting in one direction, an oblique shape in which the fibers are obliquely intersecting in one direction, a honeycomb state, and the like. It is preferable that they are present at intervals of 3 to 30 mm in the direction. In the case of a honeycomb state, the honeycomb shape formed by the fibers is preferably about 3 to 6 sides.

The fiber constituting the intermediate layer portion of the present invention may be either a multifilament or a monofilament.

The wire diameter of the fibers constituting the intermediate layer portion of the present invention is such that when the tip of the needle punch needle hits the fiber used for the intermediate layer portion, it does not break easily, and it escapes due to the inertia of the needle and the hole in the bed plate. In order to make it enter, it is preferable that the diameter is 0.5 mm or less in terms of circle.

The fibers constituting the intermediate layer portion of the present invention may be those which are firmly solidified with a resin or may be flexible without using a resin, but for the purpose of dimensional stability of the laminated sheet. Is preferably hardened with a resin. The resin as used herein refers to a thermoplastic resin such as polyvinyl acetate or acrylic acid ester, a thermosetting resin such as an epoxy resin, a phenol resin, a urea / formalin resin, or the like. The above resins may be used alone or in combination with other resins, and the kind of the resin is not particularly limited, but a thermosetting resin is used because it is necessary to withstand heat during asphalt processing. Is preferred. However, even if a thermoplastic resin is used, it can be used without any trouble if mechanical conditions such as adjustment of tension during processing are adjusted.

As a method of adhering the resin to the fibers constituting the intermediate layer portion of the present invention, a method of directly adhering the resin to the fibers or a method of adhering the resin after knitting the net is adopted.

The nonwoven fabric used in the present invention is made of thermoplastic synthetic fiber as a material. For example, polyethylene terephthalate, polyester-based polymers such as polybutylene terephthalate or acid components such as phthalic acid, isophthalic acid, glutaric acid, adipic acid, sulfoisophthalic acid, etc. as described above for the intermediate layer portion, diethylene glycol,
Propylene glycol, 2,2-bis (4-hydroxyethoxyphenyl) propane, bisphenol A, copolymers obtained by copolymerizing diol components such as polyalkylene glycol up to 15 mol%, polyethylene, polypropylene, etc. Polyolefin polymers, polyamide polymers such as nylon 6 and nylon 66, etc. are used, and fibers made of these polymers alone, or bonded type composite fibers or core-sheath type composites in which two or more kinds of polymers are combined Any of the fibers can be used.

The non-woven fabric used in the present invention is a long fiber non-woven fabric,
Although any short fiber non-woven fabric may be used, when asphalt roofing using the laminated sheet of the present invention requires high strength, it is preferable to use long fiber non-woven fabric.

The single yarn denier of the fibers constituting the nonwoven fabric used in the present invention is preferably in the range of 1 to 20 denier, and when it exceeds 20 denier, it is entangled with the fibers constituting the intermediate layer portion by needle punching treatment, Also, the entanglement between the front and back nonwoven fabrics of the fiber becomes insufficient. Further, when the thickness is less than 1 denier, when the laminated sheet is subjected to heat pressure contact, heat is transmitted to the center of the fibers constituting the intermediate layer portion and the fibers constituting the non-woven fabric, and the laminated sheet becomes plastic, so that only a sheet having no sense of volume is obtained. Sometimes I can't.

The basis weight of the nonwoven fabric used in the present invention is not particularly limited and may be appropriately selected depending on the application, but is preferably 30 to 200 g / m ² for the purpose of the present invention.

In the laminated sheet of the present invention, the intermediate layer portion and the non-woven fabric laminated on both front and back surfaces thereof are integrated by needle punching. That is, by this needle punching process, the fibers constituting the nonwoven fabric laminated on the front and back surfaces are entangled with each other, and the fibers are entangled with the fibers constituting the intermediate layer portion, whereby the laminated sheet is integrated.

The needle punching process has a needle density of 2
0 to 100 times / cm ² is preferable. Needle density is 10
When it exceeds 0 times / cm ² , the entanglement between the fibers forming the intermediate layer and the fibers forming the non-woven fabric laminated on both front and back surfaces is improved, but the fibers forming the intermediate layer and the needle collide. This may cause the surface of the laminated sheet to be uneven, or may cause needle friction or needle breakage. When the needle density is less than 20 times / cm ² , the entanglement between the fibers and the non-woven fabric and the entanglement between the fibers constituting the non-woven fabric laminated on both front and back surfaces are deteriorated, and the inter-layer portion and the non-woven fabric layer are separated. Delamination may occur, which is not preferable.

The laminated sheet of the present invention can be impregnated with resin after the needle punching treatment. For resin impregnation, after laminating the intermediate layer portion and the non-woven fabric laminated on both front and back surfaces thereof, a laminated sheet is formed in the resin layer using a general resin such as an acrylic ester, an epoxy resin, and a phenol resin. A method of squeezing with a squeezing means such as a mangle roll and then drying with a band dryer, a method of applying resin foam foamed with a foaming machine to a laminated sheet and then drying with a hot air dryer, etc. are used. The resin impregnation amount is preferably 10 to 30% by weight. If it is less than 10% by weight, it is not preferable because the integrity between the intermediate layer portion and the nonwoven fabric laminated on both front and back surfaces thereof is insufficient and the dimensional stability of the laminated sheet is deteriorated. This is not preferable because the sheet becomes hard and it becomes difficult for the asphalt to be impregnated during the asphalt impregnation process. By impregnating the resin, the fibers constituting the non-woven fabric laminated on both front and back surfaces and the fibers constituting the intermediate layer portion are fixed, and the intermediate layer portion and the front and back surfaces thereof are laminated together. The integrity with the non-woven fabric is improved.

Further, in the laminated sheet of the present invention, it is preferable that the nonwoven fabric has a low shrinkage because the constituent fibers of the laminated sheet can withstand heat during asphalt processing. Here, the low shrinkage means that the area shrinkage rate of the single-layer nonwoven fabric when heat-shrinked is less than 5%. If the area shrinkage of the non-woven fabric is less than 5%, the laminated sheet of the present invention using the non-woven fabric is
Heat shrinkage of 2 as a sheet for asphalt roofing
% Or less will be sufficiently satisfied. In order to make the non-woven fabric to have a low shrinkage, it is preferable to perform the heat treatment after the needle punching treatment. As the heat treatment, for example, a method of hot-pressing the laminated sheet using a hot-pressing roll, a method of shrinking the nonwoven fabric itself with a hot-air dryer and joining it to the intermediate layer portion, or the like is used. By subjecting the laminated sheet of the present invention to the heat treatment, the constituent fibers of the non-woven fabric itself contract, so that the stress becomes large, and the laminated sheet can withstand the heat during asphalt processing. Further, the integrity between the intermediate layer portion and the non-woven fabric laminated on both front and back surfaces thereof is improved.

Further, when the laminated sheet of the present invention is subjected to both heat treatment and resin impregnation treatment, the bondability between the intermediate layer portion and the nonwoven fabric laminated on both front and back surfaces thereof can be further improved. .

[0029]

In the laminated sheet of the present invention, nonwoven fabrics are arranged on both sides, fibers having high strength and high elasticity are interposed in the intermediate layer portion, the intermediate layer portion and the nonwoven fabric are laminated and needle punched, and both front and back surfaces are laminated. The fibers that make up the non-woven fabric are entangled with each other, and the fibers that are entangled with the fibers that make up the intermediate layer part are integrated, so high strength and high elasticity that cannot be obtained with conventional needle-punched nonwoven fabrics It becomes a laminated sheet which has a heat resistance during asphalt processing.

Further, the laminated sheet of the present invention in which a low shrinkage nonwoven fabric is used by resin impregnation and / or heat treatment is a laminated sheet having higher strength and elasticity.
The sheet can withstand the heat of asphalt processing.

[0031]

The present invention will be described below in detail with reference to examples. In addition, the measurement and evaluation of various characteristics in the examples,
It carried out by the following method.

(1) Cutting strength of intermediate layer fibers (g /
d): According to the method described in JIS L-1069, a constant speed extension type tensile tester (Tensilon manufactured by Orienteik Co., Ltd.) was used to measure 10 points at a pulling speed of 20 cm / min, and the obtained load during cutting was obtained. The value is divided by the fineness of the fiber (d), and the average value is cut strength (g / d) of the fiber.
And

(2) Stress (g / d) at 3% elongation of the intermediate layer fiber: According to the method described in JIS L-1069, 3% at a tensile speed of 20 cm / min per 10 points of the sample.
The load value at the time of elongation was measured, each load value was divided by the fiber fineness (d), and the average value was taken as the stress (g / d) at the time of 3% elongation of the fiber.

(3) Tensile strength of laminated sheet (kg / 5c
m width): In accordance with the strip method described in JIS L-1096, using a constant-speed extension type tensile tester (Tensilon manufactured by Orienteic Co., Ltd.), 10 cm sample widths and 10 cm gripping intervals for 10 sample pieces each having a width of 5 cm. Speed 10c
The tensile strength of the laminated sheet (kg / 5 cm width) was determined by measuring the average tensile strength obtained in m / min.

(4) Stress (k in 3% elongation of laminated sheet
g / 5 cm width): Tensile speed 10 cm per 10 points of the sample according to the strip method described in JIS L-1096
The load value at 3% elongation was measured in 1 / min, each load value was divided by the sample width of 5 cm, and the average value was taken as the stress at 3% elongation of the laminated sheet (kg / 5 cm width).

(5) Dimensional stability after asphalt impregnation (%): Asphalt roofing in which a laminated sheet was impregnated with asphalt was left in a hot air high temperature dryer at 80 ° C. for 1 week, and the dimensional change was measured to obtain the asphalt impregnation. The subsequent dimensional stability was defined as (%).

Example 1 Polyethylene terephthalate having a melting point of 260 ° C. and an intrinsic viscosity (measured at 20 ° C. using a mixed solvent of phenol / ethane tetrachloride in weight) at a pore size of 0.35 mm and a number of holes of 16
Using a spinneret of No. 0, it was discharged from the spinneret at a melting temperature of 285 ° C., sucked and drawn by an air sacker at a spinning speed of 4,500 m / min, and a fiber having a single yarn fineness of 3.0 denier after being taken up was wire netting. Collected on top and made into a web. The web was weakly pressure-bonded with a heat pressure-bonding roll to obtain a nonwoven fabric. The basis weight of the obtained non-woven fabric was 40 g / m ² .

Next, the wire diameter is 0.5 mm and the tensile strength is 5.5.
g / d, a glass fiber having a stress of 4 g / d at 3% elongation and a dry heat shrinkage rate of 0% when treated at 180 ° C. for 10 minutes was arranged at 10 mm intervals in the longitudinal direction to form an intermediate layer portion. After laminating the above-mentioned non-woven fabrics on both front and back surfaces of the intermediate layer portion and using a needle punching machine equipped with an organ company needle (PPD-1 No. 40), needle punching treatment was performed at a needle density of 45 times / cm ² , and then the temperature was changed. A laminated sheet was obtained by pressing with a heating roller at 230 ° C.

Example 2 The same as Example 1 except that after the needle punching treatment, the heating treatment was not performed and the mixed resin of urea melamine resin and acrylic ester resin was impregnated at 25% by weight. Similarly, a laminated sheet with resin was prepared.

Example 3 15.0% by weight of a mixed resin of urea melamine resin and acrylic ester resin was added to the laminated sheet obtained in Example 1.
It was impregnated to prepare a laminated sheet with resin.

Example 4 In Example 1, instead of using the intermediate layer portion made of glass fiber, wire diameter 0.7 mm, tensile strength 6 g / d, 3%
Except that a polyvinyl alcohol fiber having a stress of 3 g / d during extension and a dry heat shrinkage of 0.2% when treated at 180 ° C. for 10 minutes was arranged at 10 mm intervals in the longitudinal direction to form an intermediate layer portion. A laminated sheet was obtained in the same manner as in Example 1. The obtained laminated sheet was prepared by the same process as in Example 3 except that the mixed resin of urea melamine resin and acrylic ester resin was 18.0.
A laminated sheet with a resin was prepared by impregnating the resin with a weight percentage.

Example 5 In Example 1, instead of using the intermediate layer part made of glass fiber, the wire diameter was 0.5 mm, the tensile strength was 6.2 g / d,
Stress at 3% elongation is 3.5 g / d and 10 at 180 ° C
A laminated sheet was prepared in the same manner as in Example 1 except that a net formed by knitting polyester fibers having a dry heat shrinkage ratio of 0.4% during the treatment for 10 minutes at intervals of 10 mm in both the warp direction and the weft direction was used as the intermediate layer portion. Obtained. The obtained laminated sheet was impregnated with a mixed resin of urea melamine resin and acrylic ester resin in an amount of 16.0% by weight in the same manner as in Example 3 to prepare a laminated sheet with resin.

Example 6 In Example 1, the intermediate layer portion had a wire diameter of 0.5 mm, a tensile strength of 5.5 g / d, and a stress of 3 g elongation of 4 g / d, and 180.
A laminated sheet was obtained in the same manner as in Example 1 except that a net in which glass fibers having a dry heat shrinkage of 0% at 10 ° C. for 10 minutes were knitted at intervals of 10 mm in both warp and weft directions was used. . The obtained laminated sheet was impregnated with 15.0% by weight of a mixed resin of urea melamine resin and acrylic ester resin in the same process as in Example 3 to prepare a laminated sheet with resin.

Comparative Example 1 A laminated sheet was obtained in the same manner as in Example 1 except that the intermediate layer portion was not used.

Comparative Example 2 The laminated sheet obtained in Comparative Example 1 was processed in the same manner as in Example 3 to prepare a laminated sheet with a resin.

Evaluation after Asphalt Impregnation Using the laminated sheets obtained in Examples 1 to 6 and Comparative Examples 1 and 2, asphalt impregnation was carried out at an asphalt temperature of 180 ° C. and a tension of 0.7 kg / cm during processing. Created asphalt roofing.

Physical properties of the laminated sheets obtained in Examples 1 to 6 and Comparative Examples 1 to 2, and Examples 1 to 6 and Comparative Example 1
The dimensional stability of the asphalt roofing obtained from the laminated sheets of Nos. 2 to 2 was evaluated, and the results are shown in Table 1.

[0048]

[Table 1]

As is clear from the table shown in Table 1,
The laminated sheets obtained in Examples 1 to 6 satisfying the constitutional requirements of the present invention have a high-strength, high-modulus fiber arranged in the intermediate layer portion, and a non-woven fabric and an intermediate layer laminated on both front and back surfaces. Since the parts are integral with each other, the tensile strength and the stress at the time of 3% elongation were both excellent.

On the other hand, the laminated sheets of Comparative Examples 1 and 2 had low tensile strength and low stress at 3% elongation, as is apparent from Table 1.

As for the dimensional stability of the asphalt roofing impregnated with asphalt, as is clear from Table 1, the asphalt roofings obtained in Examples 1 to 6 have specific physical properties in the intermediate layer portion. Since the fibers are arranged and the non-woven fabric laminated on both front and back surfaces and the intermediate layer portion are integrated, the longitudinal and lateral expansion and contraction are small and the dimensional stability is excellent.

On the other hand, the asphalt roofing obtained in Comparative Examples 1 and 2 had insufficient dimensional stability.

[0053]

INDUSTRIAL APPLICABILITY The laminated sheet for asphalt roofing of the present invention comprises a non-woven fabric arranged on both sides, a fiber having high strength and high elasticity is interposed in the middle layer, and the middle layer and the non-woven fabric are laminated to form a needle. Not achievable with conventional needle-punched non-woven fabrics, because fibers constituting the non-woven fabrics punched and laminated on the front and back sides are entangled with each other and the fibers are entangled and integrated with the fibers constituting the intermediate layer portion. It becomes a laminated sheet with high strength and elasticity, and can withstand the heat during asphalt processing.

Further, the laminated sheet of the present invention in which a low shrinkage nonwoven fabric is used by resin impregnation and / or heat treatment is a laminated sheet having higher strength and elasticity.
The sheet can withstand the heat of asphalt processing.

Therefore, when an asphalt roofing is prepared using the laminated sheet for asphalt roofing of the present invention, an asphalt roofing having extremely small internal strain and excellent dimensional stability can be obtained.

Claims (3)

[Claims] 1. A glass fiber, a polyvinyl alcohol fiber, or a polyester fiber, having a tensile strength of 5 g /
d or more, stress at 3% elongation is 2 g / d or more, and 180
A fiber having a dry heat shrinkage of 0.5% or less when heat-treated at 10 ° C. for 10 minutes is laminated on an intermediate layer portion existing in one direction or the above-mentioned direction and a direction intersecting with the intermediate layer portion, and both surfaces of the intermediate layer portion. The asphalt roof is characterized in that the formed nonwoven fabric is entangled with fibers constituting the nonwoven fabric on both front and back surfaces by needle punching, and the fibers are integrated by being entangled with the fibers forming the intermediate layer portion. Laminated sheet for ing. 2. A glass fiber, a polyvinyl alcohol fiber, or a polyester fiber, which has a tensile strength of 5 g /
d or more, stress at 3% elongation is 2 g / d or more, and 180
A fiber having a dry heat shrinkage of 0.5% or less when heat-treated at 10 ° C. for 10 minutes is laminated on an intermediate layer portion existing in one direction or the above-mentioned direction and a direction intersecting with the intermediate layer portion, and both surfaces of the intermediate layer portion. The formed nonwoven fabric is entangled with the fibers forming the nonwoven fabric on the front and back sides by needle punching, and the fibers are integrated by being entangled with the fibers forming the intermediate layer portion, and the fibers are fixed by resin impregnation. A laminated sheet for asphalt roofing, which is characterized by 3. The laminated sheet for asphalt roofing according to claim 1, wherein the nonwoven fabric has a low shrinkage.