JPH07102461A - Textile interior material and its processing - Google Patents

Abstract

PURPOSE:To provide a textile interior material having easily adjustable shape, dimension, etc., high designing flexibility of color arrangement, pattern, etc., light weight, airpermeability and excellent mechanical strength, heat-resistance, sound-insulation, etc. CONSTITUTION:This textile interior material having a thickness of 5mm is produced by using (A) a hot-melt core-sheath conjugate fiber consisting of a high-melting polyester fiber (melting point: 250-280 deg.C) having a fineness of 2-15de and a fiber length of about 51 mm as a the core fiber and a polyester fiber having a melting point of 110-130 deg.C as the sheath fiber and (B) a polyester fiber having a melting point of 250 deg.C (the fineness is 13de and the fiber length is about 51mm) as a non-fusible fiber, uniformly blending both fibers at a weight ratio of 60/40, heating the blended fibers in a hot-air circulating thermostatic chamber at 140 deg.C for about 15 min, placing on a plate (room temperature) of a compression molding machine immediately after taking out of the chamber and pressing under a pressure of 200t/cm<2>.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber interior material used as a building material, etc., and its processing method. More specifically, it is easy to adjust the shape, dimensions, etc., and the degree of freedom in color arrangement, design, etc. Highly lightweight, breathable, breathable, and has excellent mechanical strength, durability, heat insulation, sound insulation, etc., and a method of heating and softening, deforming and processing the required parts .

[0002]

2. Description of the Related Art As interior materials for building interior walls, flooring materials, ceiling materials, fittings, etc., wood such as cedar, spruce pine, cypress, hemlock, plywood, etc., hard vinyl chloride, fiber reinforced Various materials such as synthetic wood materials such as plastic, polyethylene foam, and rigid polyurethane foam are used. For interior materials of buildings, appropriate weight, water absorption, mechanical strength such as bending strength and impact strength, thermal characteristics such as heat insulation and heat retention, and cushioning and sound insulation are many. However, each of the above materials is used under the condition that the characteristics can be utilized depending on the characteristics of each material.

In each of the above interior materials, wood such as cedar and cypress is light in weight and excellent in bending strength, compression strength, etc., but it has a large water absorption amount and is slightly inferior in durability. Lack of heat insulation and sound insulation.Veneer boards are lightweight and excellent in workability, but have poor mechanical strength and durability, and like wood, they also lack heat insulation and sound insulation.There are various types of plywood. However, they are generally light in weight and have sufficient mechanical strength, but they also have a high water absorbency and a little inferior durability like wood.The rigid vinyl chloride sheet has excellent mechanical strength, but is very heavy and deforms due to heat ( The fiber reinforced plastic sheet has a very large mechanical strength, but is heavier than the above vinyl chloride sheet, and is a glass that is often used as a reinforcing material. Fiber is There are major problems in the work environment. Polyethylene foam, rigid polyurethane foam, and other foams are lightweight and have excellent heat insulation and sound insulation properties, but poor mechanical strength such as bending strength and impact strength. , Each have advantages and disadvantages.

Further, when each of the above interior materials is constructed while being processed on site, it requires a long period of construction and requires a high degree of skill, so it is necessary to secure a person with such high technology. This is not easy, but on the other hand, when using interior materials that have been processed in advance in accordance with the shape and dimensions of the construction site in a factory, etc., it is necessary to ensure that the required number of materials with the required shape and dimensions are prepared by the specified quantity and deadline. Moreover, it is not easy to change the shape or size of these members on site, and it is often difficult to deal with small design changes during construction.

[0005]

DISCLOSURE OF THE INVENTION The present invention is excellent in mechanical strength and durability, is easy to adjust the shape and size, is excellent in heat insulating property, sound insulating property, is lightweight and breathable, and has a surface. The interior material made of fiber that can be easily painted, printed, printed, etc. and has a color scheme and pattern of your choice, and the required shape with a simple device and method at construction sites, factories, etc. It is an object to provide a method of processing into dimensions.

[0006]

The fiber interior material of the first aspect of the present invention softens or melts at least the surface of the mixed fiber containing the heat-welding fiber and the non-heat-welding fiber. While heating above the temperature or immediately after heating, 50t
It is characterized in that it is formed by pressurizing to a pressure of not less than / cm ² and is formed of a fiber-welded molded article having a joint formed by heat-welding the heat-weldable fiber. In a second aspect of the invention, the heat fusible fiber is a core made of low melting point polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl chloride fiber, nylon fiber, ethylene vinyl acetate copolymer fiber, and high melting point type polyester fiber. One or more of adhesive core-sheath type fibers which are composed of a coating portion which covers the core and which is composed of a thermoplastic resin having a melting point lower than the melting point of the high melting point polyester fiber by 30 ° C. or more. It is characterized by being.

The third aspect of the present invention is that the heat-weldable fiber comprises:
A core made of high-melting point polyester fiber, and a core covering the core and having a melting point of 30 from the high-melting point polyester fiber.
A coating part made of a thermoplastic resin having a melting point lower than ℃,
The non-heat-welding fiber is an adhesive core-sheath type fiber, and the fiber interior material of the fourth invention is a high-melting point polyester fiber. An adhesive core-sheath fiber composed of a core and a coating part which covers the core and is made of a thermoplastic resin having a melting point lower than the melting point of the high melting point polyester fiber by 30 ° C. or more is provided. While heating above the temperature at which at least the surface of the part softens or melts, or immediately after heating, 5
It is characterized in that it is formed by pressurizing to 0 t / cm ² or more and is formed of a fiber-welded molded article having a joint formed by heat-welding the covering portion.

Further, the fifth invention is characterized in that at least a part of the fibers constituting the fiber-welded molded article is flame-retardant fiber, and the sixth invention is such that the ratio of the flame-retardant fiber is above. It is characterized in that it is 10 to 100% by weight when the total amount of fibers constituting the fiber-welded molded article is 100% by weight. The seventh invention is to press the mixed fiber containing the heat-weldable fiber and the non-heat-weldable fiber to a temperature at which at least the surface of the heat-weldable fiber is softened or melted or higher, or immediately after heating. It is formed of a fiber-welded molded article having a joint formed by heat-welding the heat-weldable fiber, having a density of 0.08 to 0.9 g / cm ³ and a basis weight of 10
It is characterized in that it is 0 to 2000 g / m ² . Also,
An eighth aspect of the present invention relates to the above-described method for processing a fiber interior material, which is characterized in that a required portion of the fiber interior material is heated and softened, and the fiber interior material is deformed in accordance with the shape of the surface to be processed and processed. And

The above-mentioned "heat-fusible fiber" (hereinafter referred to as "welding fiber") mainly has a heat-bonding (welding, fusing) effect, and includes low-melting point polyester fiber, polyethylene fiber,
1 of polypropylene fiber, polyvinyl chloride fiber, nylon fiber, ethylene vinyl acetate copolymer fiber, etc.
One kind or two or more kinds can be used. These melt by heating above the melting point to a high temperature, losing their original fiber shape and welding together to form multiple joints. The above-mentioned "non-heat-welding fiber" (hereinafter referred to as "non-welding fiber") is entangled and incorporated into the net-like body made of this welding fiber, and the above-mentioned "fiber-welding molded body" is obtained by compression molding this product. Is formed.

When the original fiber shape is lost and the surface is not heated to a high temperature and only the surface is softened or melted,
The welded fibers are adhered or welded to each other while maintaining the fiber shape. Further, the welding fiber is a "core" made of "high melting point type polyester fiber" and a thermoplastic resin which covers the core and has a melting point lower than the melting point of the high melting point type polyester fiber by 30 ° C or more. It is also possible to make an "adhesive core-sheath fiber" (hereinafter referred to as a core-sheath fiber) composed of In the case of this core-sheath type fiber, the volume of the fiber is not reduced even if the temperature is high, and the volume is not decreased. Also, since the core fiber is made of high melting point type polyester, thermal characteristics such as heat resistance and mechanical characteristics, etc. Is also excellent.
The core of the core-sheath fiber may be a solid body or a hollow body. The hollow body is lighter in weight and has excellent elasticity. Also, rubber elastic fiber can be used as the core.

The above-mentioned "non-welded fiber" may be one having a melting point higher than that of the above-mentioned welded fiber, and usually 1
A material having a high melting point of 50 to 280 ° C. is used. As these fibers, polyester fibers made of polyethylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, etc., nylon fibers made of nylon 66, other synthetic fibers, natural fibers, etc. can be used. As described above, as the welded fiber and the non-welded fiber, a combination of the high-melting point type polyester fiber and the low-melting point type polyester fiber, mutual fusion property, mechanical properties of the obtained interior material, and both fibers It is most preferable in consideration of the balance of melting point difference. Except for polyvinyl chloride fibers, the exemplified welded fibers and non-welded fibers including the above polyester fibers do not generate toxic gas when burned, and are preferable as interior materials for buildings, particularly houses.

The difference in melting point between the welded fiber and the non-welded fiber is 20
It may be about C or higher. If this difference is too small,
At the time of heating and melting, the non-welded fibers are also melted, resulting in a molded product with high rigidity lacking flexibility, which is inferior in heat insulating property and sound insulating property, which is not preferable. Further, depending on the type of each fiber or molding conditions such as heating temperature, the two can be appropriately welded and adhered to each other. In such a case, the two are not merely physically entangled, but also the interior material to be obtained. Various characteristics can be adjusted more widely.

The mixing ratio of the above-mentioned welded fiber and non-welded fiber is
Usually, the weight ratio is appropriately selected within the range of 10:90 to 90:10. As a result, a fiber interior material having desired performance can be obtained. That is, if the blending ratio of the welded fiber is increased, a softer fiber is obtained throughout the fiber interior material, while if it is reduced, a softer fiber is obtained throughout the fiber interior material. This welding fiber is 10%
When the amount is less than the above, the number of joints formed by heat welding between the welded fibers is reduced, and the strength of the entire fiber interior material becomes insufficient. On the other hand, when it exceeds 90%, the number of joints becomes excessive and the manufactured The fiber interior material becomes too hard, which is not preferable. Thus, the fiber interior material of the present invention, even by using mixed fibers with different blending ratio of the welded fibers and the non-welded fibers, depending on the purpose and application, hardness, mechanical strength, etc., its properties Can be changed appropriately. Further, the shapes of the welded fibers and the non-welded fibers (whether curled, twisted, etc.), thickness, length, etc. can be variously selected according to the purpose and application.

The fiber interior material made of a mixed fiber containing the welded fiber and the non-welded fiber has been described above. The fiber interior material of the present invention, like the fourth invention, is the welded fiber in the first invention. It is also possible to make a fiber interior material using only the core-sheath type fiber used as one of the above. This core-sheath type fiber is composed of a high melting point fiber forming a core and a coating portion formed of a low melting point thermoplastic resin, and a coating portion corresponding to a welding fiber and a core fiber corresponding to a non-welding fiber. It is an integrated structure. When such a core-sheath fiber is used, the mixture of the welded fiber and the non-welded fiber becomes non-uniform, and due to the uneven distribution of both fibers, there is no problem of non-uniformity of the interior material or deterioration of performance. It is preferable because it does not exist.

Further, at least a part of the fibers constituting the fiber-welded molded article may be "flame-retardant fibers". As the flame-retardant fiber, the welded fiber and / or the non-welded fiber or the core-sheath fiber itself may be flame-retardant, or other flame-retardant fiber may be blended. The flame retardancy can be imparted to the entire or required place of the fiber interior material, and can be used without any problem as an application requiring flame retardancy, for example, an interior material for a house, especially as an interior material for a kitchen or the like. . As the flame-retardant fiber, it is possible to use one in which the material resin forming the fiber itself is a flame-retardant resin, and a fiber made of a resin to which flame retardancy is imparted by adding an organic or inorganic flame retardant. .

Examples of the flame-retardant resin itself include aromatic nylon resin, phenol resin, vinylidene resin, vinyl chloride resin, and flame-retarded acrylic resin. Examples of the organic flame retardant include phosphorus-based flame retardants such as polyphosphate carbamate and polyphosphate ester, halogen-containing ester, phosphorus-halogen flame-retardant such as chlorine-containing polyphosphonate, halogenated phthalic anhydride, and chlorinated paraffin. Halogen-based flame retardants such as guanidine sulfamate, and sulfur-based flame retardants such as thiourea methylol compounds, and inorganic flame retardants include ammonium phosphate salts, ammonium salts such as ammonium sulfate salts, titanium chloride, and bismuth chloride. Examples of the flame retardant include metal chlorides such as the above and alkali metal salts such as sodium silicate and sodium borate. Flame-retardant processing is a method of spinning using a raw material resin in which the required amount of the flame retardant has been kneaded and added, and immersing the fiber in a solution in which the required amount of the flame retardant is dissolved in an appropriate solvent, taken out and dried. After that, it is carried out by a method such as heat treatment if necessary.

The above-mentioned flame-retardant fiber is 10 to 10 when the total amount of fibers constituting the fiber-welded article is 100% by weight.
Used in the range of 100% by weight. When the proportion of the flame-retardant fiber is less than 10% by weight, sufficient flame retardancy cannot be obtained, which is not preferable. Further, even if all the fibers are flame-retardant fibers as described above, there is no problem in terms of the performance of the obtained interior material, but it is not preferable from the viewpoint of product cost, from both aspects of flame-retardant performance and cost. The proportion of the flame-retardant fiber is more preferably in the range of 20 to 60% by weight.

The method for producing the fiber interior material of the present invention will be described below. The fiber interior material of the present invention is a mixed fiber of the above-mentioned welded fiber and non-welded fiber, or a core-sheath fiber (hereinafter,
Mixed fibers, etc.), and if necessary, flame-retardant fibers, etc., are mixed as uniformly as possible by a fiber blender, formed into a web by a card machine, and a plurality of the webs are stacked to form a welded fiber, or Core-sheath fiber coating (hereinafter,
At least the surface of (welded fiber, etc.) is softened or melted, and the non-welded fiber or the core fiber of the core-sheath type fiber is heated to a temperature range where it does not soften, does not melt or slightly melts, and is produced by compression molding. You can The interior material obtained by the above method has substantially the same surface shape as the above web. Therefore, according to the required surface shape of the interior material,
It may be manufactured in the same size, may be manufactured several times in size and cut and used, or may be manufactured in a fraction and manufactured by combining several sheets. It may be used. Further, the thickness of the web, the weight per unit area, etc. are not particularly limited, but it is usually preferable that the thickness is several mm and the weight per unit weight is several tens of g.

The compression molding may be carried out by sandwiching the (unheated) web at room temperature between the heating plates of the compression molding machine and heating and pressurizing the web to a predetermined thickness. , The web is heated in a constant temperature bath with a uniform temperature distribution in a hot air circulation type set to a predetermined temperature until at least the surface of the welded fibers is softened or melted, and the high temperature mixed fibers, etc. May be sandwiched between plates heated or cooled to a room temperature or a relatively low temperature of a compression molding machine to press and mold. No matter which method is used for manufacturing, the total thickness of a web in which a plurality of layers are stacked as described above is several tens of millimeters. Therefore, when the web is compressed to a predetermined thickness at a time, the thickness direction In some cases, a homogeneous interior material cannot be obtained. In such a case, the overlapped webs are compressed to, for example, a half thickness, held in that state for a while (several minutes), and then further compressed to obtain the target 1
It is also possible to adopt a method in which the thickness is about 10 mm, especially about 3 to 5 mm. Further, such stepwise molding is not limited to the above-mentioned two steps, and may be multistage molding if necessary.

In the method of heating the mixed fibers and the like in advance and then compressing them, the entire mixed fibers and the like are pressed and compressed while being uniformly heated from the surface layer to the central portion.
Suitable for manufacturing relatively thick interior materials, the joints formed by softening or melting of the welding fibers, etc. are uniform on the entire surface of the obtained interior material and from the surface layer to the center in the thickness direction. It is preferable because it is formed and a homogeneous interior material can be obtained. On the other hand, in the method of compression-molding mixed fibers that have not been preheated or that have been heated for a very short time between heating plates, even if the temperature of the plate of the compression molding machine is increased, the mixed fibers, etc. It is suitable for manufacturing relatively thin interior materials because it is difficult for heat to reach the inside.
Particularly in this case, the method of heating and compressing in multiple stages as described above is desirable. Further, the molding may be performed by using a mold having a predetermined size, or a method of cutting the peripheral edge of the molded product having a predetermined thickness by cutting the plate distance of the compression molding machine and cutting it without using the mold. Good.

In the above manufacturing method, the temperature at which the mixed fibers and the like are heated is 5 to the melting point of the resin forming the welded fibers and the like.
A temperature in the range of 50 ° C., particularly 5 to 20 ° C. higher is preferable. If this temperature is too low, the welded fibers or the like do not sufficiently adhere or weld to each other, and even if a small external force is applied to the obtained interior material, peeling and cracking are likely to occur, which is not preferable. On the other hand, when the temperature is too high, the fiber surface is thermally deteriorated,
In some cases, the welded fibers may flow in the mixed fibers to cause uneven distribution of both welded and non-welded fibers, or the coating may melt and flow and the structure of the core-sheath fibers may not be maintained. is there. Further, a sufficient number of joints are not formed, an interior material having a uniform structure cannot be obtained, and the strength becomes insufficient, which is not preferable.

In the first and fourth aspects of the invention, the pressure for pressing the mixed fiber or the like is 50 t / cm ² or more. Below this pressure, it is difficult to form a sufficient number of joints, the strength of the obtained interior material is insufficient, and the dimensional accuracy is also poor. The upper limit of the pressure is not particularly limited as long as the interior material having desired characteristics and dimensions can be obtained, but is usually 100.
When the heating temperature is t / cm ² , the heating temperature is relatively low, or the interior material is large, the pressure may be increased to about 400 to 500 t / cm ² . The fiber interior material of the seventh invention has a density of 0.08 to 0.9 g / cm ³ and a basis weight of 100 to 2
000 g / m ² , particularly preferably 150 to 1000 g /
in the range of m ^2, density, basis weight Within this range,
Good balance between rigidity and breathability of the obtained interior material,
It has excellent properties such as mechanical strength, heat insulation and sound insulation. The interior material in the above numerical range can be produced by appropriately setting the conditions of compression molding, and the heating temperature, pressure, etc. are not particularly limited as long as the interior material in the above numerical range can be obtained.

Next, a processing method using the fiber interior material of the present invention will be described. The fiber interior material of the present invention can be easily heated by heating the required portion to soften it.
It can be bent at an arbitrary angle such as 5 ° or 90 °, and can be pressed against a mold such as a cylindrical shape and heated to form a curved surface. This heating is performed, for example, by using a torch lamp, a hot air heater, a far infrared heater, etc., and separating them from the surface of the interior material by several tens of centimeters, taking care not to deteriorate the interior material surface by heating for several tens of seconds. Can be implemented. Therefore, it can be easily deformed at the construction site while conforming to the shape of the surface to be constructed, and does not require a large-scale device or the like, and does not require sophisticated processing technology. Similarly, it is easy to perform processing in advance in a factory or the like, and in this case, it is possible to insert into a predetermined mold and heat to a degree such that it is softened. Moreover, it is easy to change the shape, dimensions, etc. by heating it with a torch lamp or the like at the construction site as required.

[0024]

EXAMPLES The present invention will be specifically described below with reference to examples. Examples 1-2 A core-sheath type fiber was used as the welding fiber. The fineness of the core fiber is 2
-15 denier and a fiber length of about 51 mm were used.
The sheath portion of this fiber is a polyester fiber having a melting point of 110 to 130 ° C., and the core portion is a melting point (about 250 to 280).
Polyester fiber having a high temperature (about ° C) was used. As the non-welded fiber, a polyester fiber having a melting point of about 250 ° C. (fineness: 13 denier, fiber length: about 51 mm) was used (Example 1). These fibers were appropriately blended so that the weight ratio (non-welded fiber / welded fiber) was 60/40, and uniformly mixed by a fiber blender. Thereafter, the mixed fiber was made into a web having a length of about 1 m, a width of about 5 mm, and a basis weight of about 30 g / m ^{2 using} a card machine. Next, six webs were stacked and heated in a hot air circulation type thermostat set at 140 ° C for about 15 minutes, and immediately taken out, the internal space volume on the plate of the compression molding machine set at 140 ° C was set. Was placed in a spacer of 1 m × 1 m × 5 mm and pressed at a pressure of 200 t / cm ² for 20 seconds. Then, the pressure was removed, the molded product was taken out of the mold, and allowed to cool to obtain an interior material having a thickness of 5 mm. The weight of the obtained interior material was about 175 g / m ² , and the density was about 0.2 g / cm ³ .

In this example, the welding fiber used is a high melting point polyester fiber as a core, and even after heating, this fiber keeps almost its original shape, and the volume of the molded body is reduced little, and the product size is adjusted. It was possible to manufacture an interior material having a predetermined shape without requiring a processing step for. Moreover, the mechanical strength of the obtained interior material is also sufficient, and further, since both the welding fiber and the non-welding fiber are polyester fibers, heat resistance,
It has excellent durability and weather resistance. As the welding fiber, a core fiber made of a polyester hollow body (fineness 5 to 10 denier, fiber length 25 to 60 mm) was used (Example 2) in the same manner as described above (however, the number of webs was changed). When five interior materials were manufactured, a high quality interior material similar to the product of Example 1 was obtained except that it was lightweight and had a relatively large elasticity. In this example, the obtained interior material has a basis weight of about 140 g / m ² and a density of about 0.17 g / cm ^3.
Met.

Examples 3 to 4 In each of the examples, mixed fibers obtained by adding flame-retardant fibers to the mixed fibers of the welded fibers and the non-welded fibers used in Example 1 were used. An interior material was produced in the same manner as in Example 1 except that the heating time in 3 minutes, the plate temperature of the compression molding machine was room temperature, and the pressing time was 5 minutes. Here, in each of the embodiments,
The total amount of welded fiber, non-welded fiber and flame retardant fiber is 100
Flame-retardant fibers [polyester fibers having a melting point of 250 ° C. (fineness: 5 denier, fiber length: 51 mm)] at a ratio of 20 (Example 3) and 30 (Example 4)% by weight when the weight% is set.
Was mixed with 5% by weight of an organic polycarbamate polycarboate as a flame retardant. The obtained interior material can be improved in flame retardancy while maintaining its appearance such as mechanical strength, and can also be used for an interior wall of a house, particularly a place where fire is used such as a kitchen. It was The weight of the interior material obtained in Example 3 was about 185 g / m ² , the density was about 0.23 g / cm ³ , and the weight of the interior material obtained in Example 4 was about 180 g / m ² .
The density was about 0.21 g / cm ³ .

The present invention is not limited to the specific examples described above, but various modifications may be made within the scope of the present invention depending on the purpose and application. For example, in the present invention, a desired pattern can be provided on the surface of the interior material by uniformly mixing the fibers having different colors in the mixed fibers or arranging the mixed fibers on the surface of the mixed fibers. Also, by applying painting, printing, or printing on the surface, it is possible to make an interior material with a desired color scheme and pattern, and an interior material with a pattern with unevenness etc. on the surface by embossing method such as satin pattern You can also

[0028]

INDUSTRIAL APPLICABILITY The fiber interior material of the present invention can be produced by a simple method of compression-molding mixed fibers and the like, and the obtained interior material is easy to adjust the shape, dimensions, etc.,
It has a high degree of freedom in color arrangement and patterns, is lightweight and breathable, and has excellent mechanical strength, heat insulation, and sound insulation. Further, the tacker is effective, and there is no problem in working environment when manufacturing, processing, and constructing an interior material using glass fiber.

Claims (8)

[Claims] 1. 50 t / cm while heating a mixed fiber containing a heat-welding fiber and a non-heat-welding fiber to a temperature at which at least the surface of the heat-welding fiber is softened or melted, or immediately after the heating. An interior material made of a fiber, which is formed by pressurizing to ² or more and has a joint portion formed by heat-sealing the heat-welding fiber. 2. A core made of low melting point polyester fiber, polyethylene fiber, polypropylene fiber, polyvinyl chloride fiber, nylon fiber, ethylene vinyl acetate copolymer fiber, and high melting point type polyester fiber. One or more of adhesive core-sheath type fibers which are composed of a coating portion which covers the core and which is composed of a thermoplastic resin having a melting point lower than the melting point of the high melting point polyester fiber by 30 ° C. or more. The fiber interior material according to claim 1. 3. The heat-fusible fiber comprises a core made of a high melting point polyester fiber, a thermoplastic resin covering the core and having a melting point lower than the melting point of the high melting point polyester fiber by 30 ° C. or more. 3. The fiber interior material according to claim 1 or 2, which is an adhesive core-sheath type fiber composed of a covering portion and a non-heat-welding fiber which is a high melting point polyester fiber. 4. A core made of high melting point polyester fiber, and a coating part covering the core and made of a thermoplastic resin having a melting point of 30 ° C. or more lower than the melting point of the high melting point polyester fiber. The adhesive core-sheath type fiber to be formed is molded while being heated to a temperature at which at least the surface of the covering portion is softened or melted or higher, or immediately after being heated to a pressure of 50 t / cm ² or more, and the covering portion is heated. A fiber interior material, comprising a fiber fusion-molded article having a joint formed by welding. 5. The fiber interior material according to claim 1, 2, 3 or 4, wherein at least a part of the fibers constituting the fiber fusion-molded article is a flame-retardant fiber. 6. The proportion of the flame-retardant fibers is 10 to 100% by weight, when the total amount of fibers constituting the fiber-welded molded article is 100% by weight. Four
Or the fiber interior material described in 5. 7. A mixed fiber containing a heat-welding fiber and a non-heat-welding fiber is heated to a temperature at which at least the surface of the heat-welding fiber is softened or melted or higher, or is pressurized immediately after heating. It is formed of a fiber-welded molded body having a joint formed by heat-welding the heat-weldable fiber, and has a density of 0.08 to 0.9 g / cm ³ and a basis weight of 100 to 2
Fiber interior material characterized by being 000 g / m ² . 8. A desired portion of the fiber interior material according to claim 1, 2, 3, 4, 5, 6 or 7 is heated to soften it, and is deformed in accordance with the shape of the surface to be worked and processed. A method for processing the above fiber interior material, which is characterized in that