JPH11348162A - Cured sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cured sheet capable of being drastically reduced in its weight, strong and tough against cracking, crushing and a track, excellent in cushioning properties, corrosion fine splits and durability generating no embossing of reinforcing fibers and excellent in workability in a bad work environment. SOLUTION: In a cured sheet, laminated sheets obtained by laminating a plurality of unidirectionally oriented continuous fiber reinforced thermoplastic resin sheets on both surfaces of a foamed resin material wherein compression hardness measured by JIS K6767 is 0.5-7.0 kg/cm<2> and ball drop resilience measured by JIS K6401 is 20-40% so that the orientation direction of fibers cross each other at a right angle to form a laminate and a skin material is provided on the single surface or both surfaces of this laminate and the ratio of the thickness of the foamed resin material and the sum of the thicknesses of the laminated sheets constituting both surfaces of the foamed resin material is 1.0 or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving operation which is light, has excellent rutability, and has excellent cushioning properties.
The present invention relates to a curing sheet suitable for protecting floors and walls during interior construction work and protecting soft ground during civil engineering work.

[0002]

2. Description of the Related Art Conventionally, plywood, foamed PP sheet and stampable sheet have been used as curing sheets.

However, curing sheets using plywood are
The strength and shape retention cannot be said to be sufficient, and cracking and crushing will occur when moved by a heavy caster or the like. On the other hand, when the thickness is increased in order to improve the strength, the weight becomes too large, and the handling becomes difficult. Further, the plywood is corroded with time, and swelling and pitting are observed on the surface, and the corrosion lowers the strength. At the same time, deformation such as bending tends to occur.

[0004] In order to solve the problems of weight reduction, crushing, cracking and corrosion, a cured sheet of a foamed PP sheet has been provided.
However, new problems such as not only insufficient crushing and cracking, but also a habit at the time of storage (at the time of leaning) and a trace of a caster rut at the time of carrying heavy weight have occurred.

[0005] In order to solve the problem of habit and rut during storage (right and left), a curing sheet of a stampable sheet has been provided. However, although the problem of habits and ruts during storage (when leaning) can be solved, cracks when moving heavy objects, floating of glass fibers due to friction with casters, or in direct sunlight When used in places with severe environmental conditions, such as damage caused by floating glass fibers, reduced strength, or places where water or oil is used, new problems such as slippage occur, and the cushioning is inferior. Could not be used as.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such circumstances, and enables a drastic reduction in weight, is strong against cracks and crushed ruts, and has a cushioning property.
Excellent durability, such as corrosion protection and no lifting of reinforcing fibers, and excellent workability in poor working environments.For protection of floors and walls and civil engineering work during moving and interior work. It is intended to provide a curing sheet used for protecting soft ground.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that JIS K 6767
The compression hardness measured at 0.5 kg / cm ² or more and 7.0 kg / cm ² or less, and the rebound resilience measured at JIS K 6401 is 20% or more
A laminated sheet in which a plurality of continuous fiber-reinforced thermoplastic resin sheets oriented unidirectionally on both sides of a foamed resin body of 40% or less are laminated such that the fiber arrangement is orthogonal to one side or both sides of the laminated body The above object can be achieved by setting the ratio (former / latter) of the thickness of the foamed resin body to the sum of the thicknesses of the laminated sheets constituting both surfaces of the foamed resin body to 1.0 or more. And completed the present invention.
That is, the present invention provides a curing sheet characterized by the sheet configured as described above.

In the present invention, the continuous fiber-reinforced thermoplastic resin sheet oriented in one direction is simply referred to as a “continuous fiber-reinforced thermoplastic resin sheet” and the continuous fiber-reinforced thermoplastic resin sheet is arranged such that the fiber arrangement is orthogonal. A laminated sheet obtained by simply laminating a plurality of sheets into a “laminate sheet”, and a laminate obtained by laminating the laminated sheet on both sides of the foamed resin body is simply referred to as a “laminate”, and a skin material is provided on one or both sides of the laminate. The laminate may be simply referred to as a “curing sheet”.

The compression hardness of the foamed resin body is 1.0 kg / cm ²
More preferably 4.0 kg / cm ² or less, the skin material is preferably a thermoplastic sheet, a thermoplastic resin net or a nonwoven fabric, the thickness of the skin material is 0.05 mm or more
It is preferably 0.2 mm or less. Further, the resin used for the unidirectionally oriented continuous fiber reinforced thermoplastic resin sheet, foamed resin body and skin material is preferably a polyolefin-based resin.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. Examples of the resin used as the thermoplastic resin for the unidirectionally oriented continuous fiber reinforced thermoplastic resin sheet used in the present invention include polyethylene, polyolefin resins such as polypropylene, polyamide-6 (nylon-6),
Polyamide-6,6 (nylon-6,6), polyamide-6,12 (nylon-6,12), polyamide-6
10 (nylon-6,10), polyamide-6,12
Polyamides such as (nylon-6,12), polyamide-11 (nylon-11), polyamide-12 (nylon-12), polyamide-MXD6 (nylon-MXD6), and acrylics such as acrylonitrile-styrene copolymer. Examples thereof include (co) polymers, polyalkylene terephthalates such as polyethylene terephthalate, and polycarbonate. For example, a resin composition can be formed from different kinds of resins, such as a resin composition of polyamide-6 and polypropylene, and this resin composition can be used as a thermoplastic resin.

Among the above thermoplastic resins, polyolefin resins are recommended as resins which are desirable from the viewpoints of strength, abrasion resistance, chemical resistance, price and ease of recycling when they become waste. . As polyolefin resin,
A crystalline homopolymer or a crystalline copolymer of an α-olefin having about 2 to 10 carbon atoms, a composition of two or more crystalline homopolymers, a composition of two or more crystalline copolymers Alternatively, the concept includes a composition of one or more crystalline homopolymers and one or more crystalline copolymers.

Examples of the α-olefin having 2 to 10 carbon atoms include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene. And the like, and not limited to one type, but may be a combination of two or more types. Among crystalline polyolefin (poly-α-olefin) resins,
Practically, crystalline polypropylene resins are most versatile. Polyethylene resins are suitable for low-temperature applications, and poly-4-methyl-1-pentene resins are suitable for applications where high-temperature use is desired.

Further, the polyolefin resin used in the present invention may be a modified product. For example, when using polypropylene, a dicarboxylic acid such as maleic acid,
Alternatively, a modified product modified with an anhydride thereof (maleic anhydride or the like) can be used. When a modified product is used in the present invention, it is generally desirable that the modification ratio of the used modified product, for example, the grafting ratio when modifying maleic anhydride on polypropylene, is 1 to 10%.

The continuous fiber reinforcing material used in the unidirectionally oriented continuous fiber reinforced thermoplastic resin sheet used in the present invention usually has an average single fiber diameter of 3 to 21 μm, preferably 9 to 21 μm. They are provided as a bundle of about 500 to 4000 pieces. This convergence is commonly referred to as rovings or ends. Further, these rovings and the like can be used in a form in which two or more rovings are combined.

Examples of the inorganic fibers that meet the above prerequisites include artificial fibers such as glass fibers, carbon fibers, synthetic resin fibers, and metal fibers. Among them, glass fiber is the most widespread fiber reinforcing material in view of both physical properties and price. The disadvantages are that they are relatively heavy (unfavorable in specific strength), are easily broken, and are susceptible to alkalis. Those which do not make these problems from the beginning, and which are the highest in specific strength, are carbon fibers. There are almost no applications that emphasize specific strength over price. These may be used alone or 2
You may combine more than seeds. Further, the continuous fiber reinforcing material surface-treated with a surface treating agent such as a coupling agent (for example, silane-based, titanate-based, boron-based, aluminate-based, or zircoaluminate) may be used.

In the following, the present invention will be described by selecting the most useful glass fibers in ordinary use among these fiber reinforcing materials.

The material of the glass fiber selected as a typical continuous fiber reinforcement constituting the continuous fiber reinforced modified propylene resin structure of the present invention is usually hard glass (potassium glass commonly known as "E glass"). ). Organic fibers meeting the above prerequisites include, for example, mechanically superior wholly aromatic polyamide (trade name: aramid) fiber, PET
Fiber, PBT (poly-1,4-butylene terephthalate) fiber, wholly aromatic polyester (trade name: Kepler) fiber, and the like. These may be used alone or in combination of two or more.

In order to produce a continuous fiber reinforced thermoplastic resin sheet oriented in one direction, the above-mentioned molten state is placed inside a continuous fiber reinforced material arranged substantially parallel to the length direction of the sheet (the flow direction of the resin). Can be mentioned. When impregnating the continuous fiber reinforcement with resin, it is possible to spread the continuous fiber reinforcement in a planar shape as uniformly as possible, and to impregnate the spreader uniformly with the resin. This is preferable in that the strength can be improved.

The method of impregnating the continuous fiber reinforcement with the resin may be any method that can impregnate the resin into the continuous fiber reinforcement. For example, as the impregnation method, JP-B-63-37694, JP-B-4-41886.
And Japanese Patent Application Laid-Open No. 61-229534. This type of continuous fiber reinforced thermoplastic resin sheet is, for example, after uniformly opening a continuous fiber reinforced material such as roving in a flat shape, and then uniformly mixing the resin melt-kneaded in the extruder into the continuous fiber reinforced material. It can be formed by impregnation.

The continuous fiber reinforced thermoplastic resin sheet preferably has a thickness of 0.1 mm to 0.5 mm. Within this range, the resin sheet can be easily manufactured with good production efficiency, and can be easily reduced in weight when combined, and is excellent in handleability.

The unidirectional continuous fiber reinforced material is contained in the continuous fiber reinforced resin sheet preferably in an amount of 10 to 80% by volume, more preferably 20 to 70% by volume. Within this range, necessary bending rigidity and abrasion resistance as well as required toughness are obtained, and molding processing is easy. It is understood that the reason for this is that the resin is sufficiently impregnated into the continuous fiber reinforcement within this range. It is recommended that these fibers be arranged in a certain direction.

The foamed resin used in the present invention includes:
Examples include polyethylene foam, polypropylene foam, polystyrene foam, and polystyrene foam having a polypropylene foam in the outer layer. In addition, from the viewpoint of treating industrial waste, a composite structure in which the resin used for the resin foam and the resin used for the continuous fiber-reinforced thermoplastic resin sheet oriented in one direction are both made of a thermoplastic resin is preferable. Further, a composite structure composed of the same thermoplastic resin is more preferable.

The foam may be composed of closed cells or open cells. The use of closed cells improves the strength. The foam may be a crosslinked body or a non-crosslinked body.

The foamed resin body used in the present invention is JIS K
The compression hardness measured at 6767 is 0.5 kg / cm ² or more and 7.0 kg / cm ²
The rebound resilience measured below JIS K 6401 is 20%
More than 40%. If the compression hardness is less than 0.5 kg / cm ² , a rut tends to be formed, and if the compression hardness exceeds 7.0 kg / cm ² , the cushioning property is poor. The compression hardness of the foamed resin body is 1.0 kg / cm ² or more
It is preferably 4.0 kg / cm ² or less. If the rebound resilience is less than 20%, the cushioning property is poor, and if it exceeds 40%, ruts are easily formed.

The skin material used in the present invention is an entire surface (an upper surface other than an end surface) of a laminate in which a plurality of the above continuous fiber reinforced thermoplastic resin sheets are laminated so that the arrangement direction of the fibers is orthogonal. And / or a lower surface) of a resin having a specific thickness and a specific performance. The resin forming the skin material layer may be different from the resin forming the above continuous fiber reinforced thermoplastic resin sheet,
Preferably, the same kind of resin as the resin forming the continuous fiber reinforced thermoplastic resin sheet is used.

The resin forming the resin skin material layer includes:
Poly-α-olefin resin (for example, polyethylene resin, polypropylene resin, poly-1-butene resin, poly-4-methyl-1-pentene resin, propylene-ethylene copolymer resin, and propylene-1-butene copolymer resin Or more), polyester resin (for example, one or more of polyethylene terephthalate, polybutylene terephthalate and polyethylene terephthalate isophthalate), polyamide resin (nylon) (for example, polyamide-6, polyamide-7, polyamide-66, polyamide- 610, polyamide-11 and polyamide-1
2), polyacetal, polyurethane, etc.
Examples of the composition include a composition composed of two or more kinds and a polymer alloy composed of two or more kinds.

As the thermoplastic resin forming the resin skin layer, the above-mentioned non-modified resin and modified resin may be used alone, or at least two of them may be used in combination to form a resin composition. May be used. In addition, what is preferable as the resin which forms the resin-made skin material layer is the same type of resin as the resin which forms the above-mentioned continuous fiber-reinforced thermoplastic resin sheet, or forms the above-mentioned continuous fiber-reinforced thermoplastic resin sheet. It has compatibility with the resin. When these resins are the same type of resin or have compatibility with each other, a high bonding force is formed at the interface between the resin skin material layer and the continuous fiber reinforced thermoplastic resin sheet. It is preferable from the viewpoint of economy and recycling.

The thermoplastic resin forming the resin skin layer may contain various additives as required, for example, antioxidants, heat stabilizers, ultraviolet absorbers, resinous destruction inhibitors, antistatic agents. , Lubricant, plasticizer, mold release agent, flame retardant (flame retardant), flame retardant aid and crystallization accelerator (nucleating agent; crystallization agent)
One or more dyes and pigments may be blended. These additives may be used in a form previously mixed with the above-mentioned crystalline thermoplastic resin serving as a matrix, or may be used in the form of a master batch.

The resin skin layer may be any sheet-like material capable of protecting the friction of the base material, but is preferably a sheet, a net or a nonwoven fabric in view of the characteristics in use. The thickness of the resin skin material layer used in the present invention is preferably 0.05 mm or more and 0.20 mm or less, and more preferably 0.1 mm to 0.15 mm. Within this range, the glass fibers are not raised due to friction with the casters, and the effect of reducing the weight and thickness can be effectively achieved.

Hereinafter, the method for producing the cured sheet of the present invention will be described in detail. Any method can be adopted as a method for forming a laminated sheet in which a plurality of continuous fiber-reinforced thermoplastic resin sheets oriented in one direction of the present invention are laminated such that the fiber arrangement is orthogonal. For example, after heating a laminate of a plurality of continuous fiber reinforced thermoplastic resin sheets laminated in such a manner that the arrangement is orthogonal to the flowable temperature or more in an oven, the laminate,
If the resin has a glass transition temperature of 30 ° C or higher, put it into a press mold heated to at least the glass transition temperature or lower, and if the glass transition temperature of the resin is lower than 30 ° C, press the mold at room temperature. Injection into the mold, press-molding the mold in a short time, and simultaneously perform shaping, degassing, and cooling, a so-called stamping molding method. 3kg / cm ² while heating above temperature
There is a so-called press molding method in which the resin is pressurized at a pressure of about 10 seconds to about 60 minutes, cooled to a temperature lower than the glass transition temperature of the resin, and then released from the mold.

The lamination of the skin material and the laminated sheet may be performed before or after the formation of the laminated sheet. That is, a method of bonding a skin material after manufacturing a laminated sheet by the above-described pressing method or the like, a method of bonding the skin material to a continuous fiber reinforced thermoplastic resin sheet oriented in one direction, and a pressing method as described above. A method in which a continuous fiber-reinforced thermoplastic resin sheet not bonded with a skin material is bonded so that the fiber orientation is orthogonal to the bonded resin sheet, or a skin material, such that the arrangement of a plurality of fibers is orthogonal. A method of laminating the laminated continuous fiber reinforced thermoplastic resin sheet and foamed resin body at once by a press method or the like can be given.

In order to attach the resin-made skin material layer to the continuous fiber-reinforced thermoplastic resin sheet as described above (regardless of whether or not it has already been formed into a laminated sheet, hereinafter simply referred to as a base material), for example, a resin is previously applied. After forming into a film, the film can be laminated by a method of laminating the film on the surface of the substrate, a method of coating a resin in a molten state on the surface of the substrate, or the like.

When the resin-made skin material layer is formed by lamination, for example, first, a resin and, if necessary, a modifier and the like are mixed, supplied to an extruder, melt-kneaded, and formed into a film. To form a film. Separately, for example, a continuous fiber reinforcement is impregnated with a molten resin to form a base material. Then, while keeping the base material in a semi-molten state, the base material is laminated by laminating with a previously wound film. Note that when bonding the substrate and the film, the substrate does not necessarily need to be in a semi-molten state, and the substrate may be cooled and solidified and then bonded to the film using an adhesive.

When the resin skin layer is formed by coating, the resin may be extruded and coated on the surface of the base material while the base material is kept in a semi-molten state. After the material is cooled and solidified, the substrate surface may be coated.

On the other hand, a method of integrating the skin material of the present invention with a laminated sheet obtained by laminating a plurality of continuous fiber-reinforced thermoplastic resin sheets oriented in one direction so that the fiber arrangement is orthogonal to the foamed resin body. As a skin material and a laminated sheet of a continuous fiber reinforced thermoplastic resin sheet were brought into contact with each other at a temperature equal to or higher than the melting point temperature, and the foamed resin body was simultaneously heated to a temperature lower than the melting temperature. ~ 80
A method of applying a pressure of 3 kg / cm ² or less in a press heated to 0 ° C., cooling, and integrating to form a composite.

At this time, it is necessary to degas air existing between the layers of the continuous fiber-reinforced thermoplastic resin sheet oriented in one direction in the laminated sheet. Usually, the continuous fiber-reinforced thermoplastic resin sheet oriented in one direction is removed. Degassing is performed by heating to above the melting point of the constituent resin and applying pressure at a pressure of 3 kg / cm ² or less. If the pressure is in this range, the resin foam will not be crushed, so this deaeration can be performed in the step of integrating with the foam. As a matter of course, it is acceptable to use a material which has been deaerated in advance and cooled to form a laminated sheet.

The heating of the skin material, the laminated sheet and the foam may be carried out without bringing the skin material, the laminated sheet and the foam into contact with each other, or by placing the skin material and the laminated sheet on the foam and mutually heating. Heating can also be performed in contact. When the magnification of the foam is high, the foam is easily melted by heat, so that the surface of the foam can be easily melted and integrated by the heat stored in the molten laminated sheet, so that the laminated sheet and the foam do not come into contact with each other. It is desirable to separately heat under different heating conditions.
On the other hand, when the expansion ratio is low, the foam is hardly melted by the heat, so the surface of the foam cannot be sufficiently melted only by the heat stored in the molten laminated sheet. It is desirable to adopt a method of heating while melting the surface of the foam.

In addition, a skin material is provided on one or both sides of a laminated sheet in which a plurality of continuous fiber reinforced thermoplastic resin sheets oriented unidirectionally on both sides of a foamed resin body are laminated so that the fiber arrangement is orthogonal. The method for producing a cured sheet having the above is particularly limited as long as the material is formed so as to have the above-mentioned laminating arrangement, and the constituent materials are heated to melt the thermoplastic resin and shape to obtain the cured sheet. It is not something to be done.

The ratio of the "thickness of the foamed resin body" constituting the cured sheet to the "sum of the thicknesses of the laminated sheets constituting both sides of the foamed resin body" (former / latter) is preferably 1.0 or more, 1.5 or more and 10 or less are more preferable. If the thickness ratio (former / latter) is less than 1.0, impact properties and cushioning properties are inferior, and phenomena such as cracking are observed. In addition, if it exceeds 10.0, the lightness is slightly inferior and it is not preferable depending on the use application.

The curing sheet is used not only once but repeatedly, and is required to have durability. For durability, the mechanical strength after repeated use is important, and the retention rate of mechanical strength after repeated use is preferably 80% or more, and 90%
The above is more preferred.

[0041]

The present invention will now be described in detail with reference to examples and sometimes to useful comparative examples.
However, the invention is not limited by these embodiments.

[Evaluation Method of Curing Sheet] (1) Evaluation of Lightness: Weight Measurement (2) Evaluation of Hardness to Crack: Evaluation was made based on surface impact strength. (Surface impact strength) 50m length from the center of the obtained sheet
Five flat plates having a width of 50 mm and a width of 50 mm were cut out, and a surface impact test was performed in accordance with ASTM D3763 except that this flat plate was used as a test piece, and the total energy was defined as the surface impact strength.

(3) Evaluation of crush resistance (evaluation of rut amount): A sheet having a length of 100 mm and a width of 100 mm was prepared, the thickness of the central portion of the sheet was measured, and a steel ball having a weight of 100 kg was fixed at the central portion. Leave for 1 hour continuously. Then remove the steel ball from the sheet, 24
After leaving for a time, the thickness of the same place as before was measured, and the rut amount was measured from the following equation. The lower the rut amount, the better the rutability.

[0044]

(Equation 1)

(4) Evaluation of cushioning property: Evaluation was made based on the rebound resilience. (Rebound resilience test) A rebound resilience test was conducted in accordance with JIS K 6401 except that a sheet having a length of 100 mm and a width of 100 mm was used as a test piece, and the rebound resilience was taken as a cushion characteristic. The higher the rebound resilience, the better the cushioning properties.

(5) Durability after repeated use: 900 m long
A sheet having a width of 1800 mm and a width of 1800 mm was prepared, and a carriage with casters on which a weight of 500 kg was placed was repeatedly transported on the sheet at a speed of 5 m / min, and the sheet surface was observed after repeating 200 times. From the center of the sheet after the test,
Cut out 5 strips of 100mm and 10mm width, perform bending test according to JIS k-7203, calculate bending stiffness, compare with bending stiffness of sheet before test, and maintain bending stiffness after test Was calculated. The higher the retention rate, the better the durability.

Example 1 A continuous fiber reinforced thermoplastic resin sheet was produced according to the production method of WO97 / 19805. That is, thickness 17μ, tex count 2310g
/ Km of glass fiber rovings, filled with a melt of maleic anhydride-modified polypropylene (MFR (230 ° C; 21.18N) 100g / 10min) adjusted to a temperature of 270 ° C and having a melting point of 164 ° C It was impregnated continuously while supplying to the impregnation tank. The impregnated roving passes through a 0.25 mm x 900 mm nozzle inside the continuous fiber reinforced thermoplastic resin sheet in which the resin is in a molten state, and then passes through the shaping rolls with a surface temperature of 50 ° C and a roll spacing of 0.25 mm to be integrated. , Thickness 0.25mm, width 90
A 0 mm unidirectionally oriented continuous fiber reinforced thermoplastic resin sheet was obtained. The glass fiber content of the obtained continuous fiber reinforced thermoplastic resin sheet was 46% by weight.

Using the continuous fiber reinforced thermoplastic resin sheet produced as described above and the following constituent materials, the laminate is laminated on [skin material / continuous fiber reinforced laminated sheet / foam sheet / continuous fiber reinforced laminated sheet / skin material]. It was a laminate.

・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm thick [0 degree / 90
Degree] (The fiber orientation direction of the continuous fiber reinforced thermoplastic resin sheet oriented in one direction was set to 0 degree) ・ Foam sheet: thickness 1.5 mm, compression hardness 2.5 kg / cm ² , rebound resilience 30%

Next, this laminate was sandwiched between aluminum plates to which a Teflon film for release was attached, placed in a press hot plate heated to 200 ° C., and pressed at a pressure of 5 kg / cm ² for 10 minutes. 5kg / cm into a cooling press plate adjusted to ℃
After pressurizing and cooling at a pressure of ² for 10 minutes, a laminate molded sheet (cured sheet) of 1.8 mm was obtained. After conditioning at 23 ° C for 48 hours,
The molded product was subjected to a weight measurement, a surface impact test, a rut amount measurement test, a rebound resilience test, and a durability test. Table 1 shows the evaluation results.

Examples 2 to 4 and Comparative Examples 1 to 4 The structure of the laminate of Example 1 was replaced as follows. The evaluation results are shown in Tables 1 and 2.

Example 2 Skin / Continuous fiber reinforced laminated sheet / foamed sheet /
Laminated sheet / skin material reinforced with continuous fiber ・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm [0 degree / 90
Degree] ・ Foam sheet: thickness 2.5mm, compression hardness 2.5kg / cm ² , rebound resilience 30%

Example 3 Skin material / Laminated sheet reinforced with continuous fiber / Foam sheet /
Laminated sheet / skin material reinforced with continuous fiber ・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm [0 degree / 90
Degree] ・ Foam sheet: thickness 4.0mm, compression hardness 2.5kg / cm ² , rebound resilience 30%

Comparative Example 1 Skin / Laminated sheet reinforced with continuous fiber / foamed sheet /
Laminated sheet / skin material reinforced with continuous fiber ・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm [0 degree / 90
Degree] ・ Foam sheet: thickness 2.5mm, compression hardness 2.5kg / cm ² , rebound resilience 60%

Comparative Example 2 Skin material / Laminated sheet reinforced with continuous fiber / foamed sheet /
Laminated sheet / skin material reinforced with continuous fiber ・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm [0 degree / 90
Degree] ・ Foam sheet: thickness 2.5mm, compression hardness 2.5kg / cm ² , rebound resilience 10%

Example 4 Skin material / Continuous fiber reinforced laminated sheet / foamed sheet /
Laminated sheet / skin material reinforced with continuous fiber ・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm thick [0 degree / 90
Degree] ・ Foam sheet: thickness 2.5mm, compression hardness 6.0kg / cm ² , rebound resilience 30%

Comparative Example 3 ・ Skin material / Laminated sheet reinforced with continuous fiber / Foam sheet /
Laminated sheet / skin material reinforced with continuous fiber ・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm thick [0 degree / 90
Degree] ・ Foam sheet: thickness 2.5mm, compression hardness 0.2kg / cm ² , rebound resilience 30%

Comparative Example 4 Skin / Continuous fiber reinforced laminated sheet / foamed sheet /
Laminated sheet / skin material reinforced with continuous fiber ・ Skin material: 0.1 mm PP sheet ・ Laminated sheet reinforced with continuous fiber: 0.5 mm [0 degree / 90
Degree] ・ Foam sheet: thickness 0.5mm, compression hardness 2.5kg / cm ² , rebound resilience 30%

Comparative Example 5 Using a 12 mm plywood, a molded product was subjected to a weight measurement, a surface impact test, a rut amount measurement test, a rebound resilience test, and a durability test. Table 2 shows the evaluation results.

Comparative Examples 6 and 7 The plywood of Comparative Example 5 was replaced as follows. Comparative Example 6 • A 3.0 mm expanded 1.3 times expanded PP sheet (specific gravity 0.70)
(Trade name: Happo, Mitsui Toatsu Co., Ltd.) Comparative example 7-2.0 mm stampable sheet (specific gravity 1.19) (trade name: Azdel, Ube Nitto Kasei Co., Ltd.)

[0061]

[Table 1]

[0062]

[Table 2]

From the above results, the following can be understood. -Examples 1-4: Excellent in surface impact strength, rutability, cushioning property, and durability after repeated use.・ Comparative Example 1: Inferior in rutability ・ Comparative Example 2: inferior in cushioning property ・ Comparative Example 3: inferior in rutability ・ Comparative Example 4: Inferior surface impact strength and cushioning property ・ Comparative Example 5: Light weight, surface impact Inferior in strength and cushioning property, and durability after repeated use is reduced due to corrosion of plywood and reduced strength. Comparative Example 6: Surface impact test, durability after repeated use,
Crushing of ruts and the like are observed, and strength is reduced. Comparative Example 7: Inferior in light weight and cushioning property, and durability after repeated use is such that glass fiber floats, glass fiber breakage is observed, and strength decreases.

As described above, according to the present invention,
It is lightweight, has excellent rutability and cushioning properties, has excellent corrosion resistance, does not have reinforced fibers, and has excellent workability in poor work environments. A curing sheet used to protect soft ground during protection and civil engineering work is obtained.

Claims (4)

[Claims] The compression hardness measured by JIS K 6767 is 0.
A continuous fiber-reinforced thermoplastic resin sheet unidirectionally oriented on both sides of a foamed resin body with a rebound resilience of 5 kg / cm ² or more and 7.0 kg / cm ² or less and a rebound resilience measured by JIS K 6401 of 20% or more and 40% or less. Is a curing sheet characterized by having a skin material on one or both sides of a laminated body obtained by laminating a plurality of laminated sheets such that a fiber arrangement direction is orthogonal to the laminated sheet, wherein the foaming sheet constituting the curing sheet is provided. A curing sheet characterized in that the ratio (former / latter) of the thickness of the resin body to the sum of the thicknesses of the laminated sheets constituting both surfaces of the foamed resin body is 1.0 or more. 2. A compression hardness, measured in JIS K 6767 of the foamed resin body is 1.0 kg / cm ² or more 4.0 kg / cm ² or less claim 1
The curing sheet described in 1. 3. The curing sheet according to claim 1, wherein the skin material is any one of a thermoplastic sheet, a thermoplastic resin net, and a nonwoven fabric, and has a thickness of 0.05 mm or more and 0.2 mm or less. 4. The cured sheet according to claim 1, wherein the resin used for the continuous fiber-reinforced thermoplastic resin sheet oriented in one direction, the foamed resin body and the skin material is a polyolefin-based resin.