JP2015025211A - Base cloth for heat insulation surface material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To examine the possibility of new applications of used-paper pulp, e.g. newspapers, whose utilization by recycle comes to the limit now and provide base cloth for heat insulation surface materials excellent in strength properties and rigidity even when blended with used-paper pulp.SOLUTION: Base cloth for foam plastic-based heat insulation surface materials is a nonwoven fabric which mainly comprises cellulose fiber originated from used-paper pulp, glass fiber and a fibrous binder as essential components, with at least a part of the cellulose fiber, glass fiber and fibrous binder adhered through fusion.

Description

  TECHNICAL FIELD The present invention relates to a base fabric for heat insulating face material that reuses cellulose fibers derived from waste paper.

  From the standpoint of global environmental conservation, an agreement has been established to regulate the total amount of carbon dioxide emissions in each country. Accordingly, the importance of forest resources that absorb carbon dioxide and release oxygen is increasing. From the viewpoint of addressing these global environmental conservation issues and effectively using limited resources, it is required to increase the recycling rate of waste paper, and it is extremely important to expand the range of waste paper recycling Has become a serious problem. Conventionally, recovered recovered paper has been mainly reused as recycled paper, that is, paper raw material, and its utilization rate has been continuously increasing, and the used paper utilization rate of the entire paper and paperboard in 2010 was 62.5%. It has reached a high level. However, the waste paper utilization rate for paperboard has reached 90% and is almost saturated, and it is difficult to improve the utilization rate beyond this. On the other hand, the use as a raw material for paper is still around 40%, but the pulp obtained by deinking waste paper is a pulp with low whiteness due to insufficient peeling of ink from fibers. However, it is difficult to use high-grade printing paper and information paper, and it does not match the consumer's need for high-whiteness paper, and the usage rate does not improve. In addition, due to the proactive efforts of local government resource recovery, the recycling of business waste, and the increasing awareness of resource recycling by citizens, the recovered paper recovery rate in fiscal 2010 is at a high level of 78.2%. In the future, the amount of recovered paper will continue to increase, and it will be necessary to use it for other than raw paper. However, it has only been proposed to use waste paper as a board and use it for joinery etc. as an application to use waste paper, and these boards have not yet been sufficiently evaluated in the market. At present, there is a limit to the recycling of recovered used paper, and there is a problem that no concrete measures have been found for these unused used paper.

  In recent years, as an environmental measure on a global scale, there has been an emphasis on energy conservation measures for houses, and efforts such as eco-housing and eco-renovation have been actively carried out. As energy conservation measures for homes, there are a method of cooling and heating without waste and a method of using natural power. To cool and cool without waste, there is a method of improving the heat insulation performance so that the cold air and warm air of the air conditioning are not leaked. Has been taken. This method includes heat insulation work for outer walls, roofs, ceilings, and floors. Specifically, this method is achieved by using a certain amount of heat insulating material whose insulation performance has been confirmed for each part of the outer walls, roofs, ceilings, or floors. Is done.

  In general, heat insulating materials used in houses are roughly classified into foamed plastic heat insulating materials, natural materials (cellulose fiber, wool fiber, carbonized foam cork), and inorganic fiber heat insulating materials (glass wool, rock wool). In contrast to natural materials and inorganic fiber insulation, which traps air between thin fibers, foamed plastic insulation can confine gas in independent small bubbles, which is high. Insulation performance is demonstrated. Foamed plastic insulation is roughly divided into beaded polystyrene foam, extruded polystyrene foam, rigid urethane foam, phenolic foam, and polyethylene foam, depending on the material. Then, it has the fault that there is anxiety in the strength aspect called impact resistance. Therefore, in the case of foamed plastic insulation, for the purpose of imparting strength and improving workability, nonwoven fabric, glass paper, kraft pulp, calcium carbonate-containing paper, water, Aluminum oxide internal paper or the like is appropriately selected and pasted.

  Among these base fabrics for face materials, glass paper has been frequently used in recent years from the viewpoint of shape stability such as strength, dimensional stability and warpage. However, glass paper composed of glass fibers and organic binders has a high porosity, and as such, there is a problem such as slipping through when plastic foam resin is applied to a base material base fabric. Various methods have been proposed to prevent this. There has been proposed a sheet material in which glass fibers and pulp and / or other organic fibers are mixed in a specific range, and further an inorganic filler and an organic synthetic resin are added (see, for example, Patent Document 1). Moreover, the method of providing a coating layer in the single side | surface or both surfaces of the glass paper comprised from the inorganic fiber, the organic fiber, etc. is proposed (for example, refer patent document 2). Moreover, the nonwoven fabric sheet for surface materials using the glass fiber and cellulose fiber of a specific fiber diameter is proposed (for example, refer patent document 3). Furthermore, a heat insulating foam using a sheet for a surface material in which a synthetic resin impregnated layer is formed on one side of a sheet base material containing glass fiber and natural pulp has been proposed (for example, see Patent Document 4). . However, these patent specifications do not mention the pulp fibers themselves and do not describe the use of waste paper pulp. Moreover, the panel for building materials using the coating | covering material formed by laminating | stacking a waterproof synthetic resin film on the at least single side | surface of the nonwoven fabric containing glass fiber is proposed (for example, refer patent document 5). In this patent specification, there is a description regarding blending of used paper, etc., but from the viewpoint of warping deformation, there is a description that the blending amount is desirably 35% by weight or less. There is no.

  In general, compared with virgin pulp, waste paper pulp has a problem that it is difficult to control the fiber length and degree of fibrillation of cellulose fibers, and as a result, the obtained base fabric and paper have sufficient strength. There is a problem that the strain (rigidity) is weak and inferior in secondary processing.

Japanese Utility Model Publication No. 61-21240 JP-A-1-198336 JP-A-9-310284 Japanese Patent No. 4502087 Japanese Utility Model Publication No. 56-165822

  The object of the present invention is to examine the possibility of application to new uses of used paper pulp such as newspapers, whose use is currently limited due to its recycling. And it aims at providing the base fabric for heat insulating surface materials excellent in rigidity.

As a result of intensive studies to solve the above problems, the present inventors have
(1) Cellulose fiber derived from waste paper pulp, glass fiber, and fibrous binder are contained as essential components, and at least a part of the fibrous binder is melted, and the fibrous binders or the fibrous binder and cellulose fiber and glass fiber are included. A base fabric for foamed plastic heat-insulating surface material, which is a non-woven fabric bonded by fusion,
(2) The base fabric for foamed plastic heat-insulating face material according to (1), wherein the fibrous binder is a core-sheath type heat-fusible fiber,
(3) The base fabric for a foamed plastic heat insulating surface material according to (1), wherein the fibrous binder is a polyvinyl alcohol fiber,
I found.

  The foamed plastic heat insulating base fabric of the present invention comprises a nonwoven fabric containing cellulose fibers, glass fibers, and fibrous binders derived from waste paper pulp as essential components. Cellulose fiber fibrils are intertwined with glass fibers, and at least a part of the fibrous binder is melted, and the fibrous binders or the fibrous binder, and the cellulose fibers and glass fibers are melt-bonded, resulting in high physical strength. , The rigidity is excellent.

  Hereinafter, the base fabric for a foamed plastic heat insulating material of the present invention will be described in detail. The raw paper pulp used in the present invention includes upper white, ruled white, cream white, card, special white, medium white, imitation, fair white, Kent, white art, special upper cut, separate upper cut, newspaper, magazine, etc. Can be mentioned. More specifically, information-related paper such as non-coated computer paper, thermal paper, pressure-sensitive paper, etc., printer paper such as PPC paper, OA waste paper, art paper, coated paper, finely coated paper, matte paper, etc. Uncoated paper such as old coated paper, high quality paper, color quality, notebook, notepaper, wrapping paper, fancy paper, medium quality paper, newspaper, reprint paper, supermarket paper, imitation paper, pure white roll paper, milk carton Used paper and paperboard, such as chemical pulp paper and high-yield pulp-containing paper. Of course, any of printing, copying, printing, and non-printing materials is targeted.

  In addition to waste paper pulp, normal wood pulp-derived cellulose fibers, for example, commonly used chemical pulps such as LBKP and NBKP, and mechanical pulps (MP) such as GP and TMP may be used as appropriate. Cellulose fibers obtained from non-wood fiber raw materials such as kenaf, bamboo, hemp, and cotton can also be used as appropriate, but it is more preferable to use only cellulose fibers derived from waste paper pulp because of the problem of the present invention.

  Although there is no restriction | limiting in particular in the mass mean fiber length of the cellulose fiber derived from waste paper pulp in this invention, It is preferable that fiber length is 0.3 mm or more. When the mass average fiber length is shorter than 0.3 mm, the entanglement between the cellulose fibers and between the cellulose fibers and the glass fibers becomes weak and sufficient strength may not be obtained. Note that the mass average fiber length is the JAPAN TAPPI paper pulp test method no. The value measured by the method described in 52-89 is shown.

  In the base fabric for heat insulating face material of the present invention, the content of cellulose fiber derived from waste paper pulp is preferably 40 to 95% by mass, more preferably 55 to 90% by mass, and 60 to 80% by mass. More preferably. When the content is less than 40% by mass, the formation of the sheet may be deteriorated and the quality may vary. When the content exceeds 95% by mass, sufficient mechanical strength and rigidity may not be obtained.

  Examples of the glass fiber used in the present invention include glass wool, chopped strand, and glass flake, and any glass fiber may be used as long as it is difficult to break and has a fiber sheet forming ability. The fiber diameter of the glass fiber in the present invention is preferably 1 to 18 μm, more preferably 2 to 13 μm, still more preferably 3.1 to 10 μm. If the fiber diameter is less than 1 μm, it may be too thin and fall off from the heat insulating surface material base fabric during papermaking, resulting in insufficient mechanical strength. If the fiber diameter exceeds 18 μm, it will be too thick and the gap will be large. The workability may be inferior and the skin may be irritating. For example, the workability may be hindered and it may be difficult to use. Moreover, it is preferable that the fiber length of the glass fiber in this invention is 1-30 mm, 2-15 mm is more preferable, 3-10 mm is still more preferable. When the fiber length is less than 1 mm, the physical strength may be insufficient, and when the fiber length exceeds 30 mm, the formation of the sheet may deteriorate and the quality may vary.

  Further, from the viewpoint of protecting the global environment, recycled or reused glass fibers can be used as the glass fibers used in the present invention. Recycled glass fibers include those made by melting and re-firing glass waste materials as raw materials at glass fiber manufacturers. Reusable glass fibers include phenolic resin molding material cured products mainly made of glass fiber or glass wool. The thing which grind | pulverized the waste material is mentioned.

  In the base fabric for heat insulating face materials of the present invention, the glass fiber content is preferably 5 to 50% by mass, more preferably 10 to 40% by mass, and 15 to 35% by mass. Further preferred. If the content is less than 5% by mass, the mechanical strength and rigidity may be insufficient. If it exceeds 50% by mass, the formation of the sheet may be deteriorated and the quality may vary.

  Examples of the fibrous binder used in the present invention include heat-fusible fibers and wet heat-adhesive fibers. Examples of the heat-fusible fiber include a core-sheath type, an eccentric type, a side-by-side type, a sea-island type, an orange type, a multi-bimetal type composite fiber, or a single fiber. It is preferable to contain. The core-sheath type heat-fusible fiber softens and melts only the sheath part while maintaining the fiber shape of the core part, so that the fibers are melt-bonded to each other. Suitable for bonding. There are no particular restrictions on the resin component that constitutes the core and sheath of the core-sheath fiber, and any resin having fiber-forming ability may be used. For example, the core / sheath combination includes polyethylene terephthalate / polyester copolymer, polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, polyethylene terephthalate / ethylene-propylene copolymer, polyethylene terephthalate / ethylene-vinyl alcohol copolymer. , Polypropylene / polyethylene, and high melting point polylactic acid / low melting point polylactic acid. It is preferable that the melting point and softening point of the resin component in the core part are higher by 20 ° C. or higher than the melting point or softening point of the resin component in the sheath part from the viewpoint of easy production of the base fabric. As the core-sheath type heat-fusible fiber used in the present invention, a combination of core part: polyethylene terephthalate / sheath part: polyester copolymer is preferable because the strength of the base fabric for heat insulating face material becomes higher. The polyester copolymer used for the sheath is a copolymer of polyethylene terephthalate and one or more compounds selected from isophthalic acid, sebacic acid, adipic acid, diethyl glycol, 1,4-butadiol and the like. preferable.

  In addition, the wet heat adhesive fiber refers to a fiber that exhibits an adhesive function by flowing or easily deforming from a fiber state at a certain temperature in a wet state. Specifically, it is a thermoplastic fiber that is softened with hot water (for example, about 80 to 120 ° C.) and can be self-adhered or bonded to other fibers. For example, polyvinyl fibers (polyvinyl pyrrolidone, polyvinyl ether, polyvinyl alcohol). System, polyvinyl acetal, etc.), cellulose fibers (C1-3 alkyl cellulose such as methyl cellulose, hydroxy C1-3 alkyl cellulose such as hydroxymethyl cellulose, carboxy C1-3 alkyl cellulose such as carboxymethyl cellulose or salts thereof), modified vinyl type Fibers made of copolymers (copolymers or salts of vinyl monomers such as isobutylene, styrene, ethylene, vinyl ether and unsaturated carboxylic acids such as maleic anhydride or anhydrides thereof) . As the wet heat adhesive fiber used in the present invention, a polyvinyl alcohol fiber is preferable because the strength of the base fabric for heat insulating face material becomes higher.

  The fineness of the core-sheath type heat-fusible fiber in the present invention is preferably 0.5 to 5.5 dtex, more preferably 0.7 to 3.3 dtex, and still more preferably 1.1 to 2.2 dtex. If the fineness is less than 0.5 dtex, it may be too thin and fall off from the heat-insulating face material base fabric at the time of paper making, and sufficient strength may not be ensured. If the fineness exceeds 5.5 dtex, cellulose fiber derived from waste paper pulp In some cases, sufficient strength and required denseness cannot be ensured.

  The fiber length of the core-sheath type heat-fusible fiber in the present invention is preferably 0.1 to 20 mm, more preferably 0.5 to 10 mm, and still more preferably 2 to 5 mm. If the fiber length is shorter than 0.1 mm, it may fall off from the base fabric for heat insulating face material during papermaking, and if it is longer than 20 mm, the fiber may be tangled and become lumpy, resulting in uneven thickness.

  In the base fabric for heat insulating face material of the present invention, the content of the core-sheath type heat-fusible fiber is preferably 1 to 40% by mass, more preferably 2 to 20% by mass, and 3 to 10%. More preferably, it is mass%. If the content is less than 1% by mass, the strength and rigidity may be insufficient, and if it exceeds 40% by mass, the formation of the sheet may be deteriorated and the quality may vary.

  The fineness of the wet heat adhesive fiber in the present invention is preferably 0.5 to 4.4 dtex, more preferably 0.7 to 3.3 dtex, and still more preferably 1.1 to 2.2 dtex. If the fineness is less than 0.5 dtex, it may be too thin to drop off from the heat insulating face material base fabric at the time of paper making, and sufficient strength may not be ensured. If the fineness exceeds 4.4 dtex, fiber disaggregation and dispersibility In some cases, sufficient strength cannot be secured.

  The fiber length of the wet heat adhesive fiber in the present invention is preferably 0.1 to 20 mm, more preferably 0.5 to 10 mm, and still more preferably 1 to 5 mm. If the fiber length is shorter than 0.1 mm, it may fall off from the base fabric for heat insulating face material during papermaking, and if it is longer than 20 mm, the fiber may be tangled and become lumpy, resulting in uneven thickness.

  In the base fabric for a heat insulating face material of the present invention, the content of the wet heat adhesive fiber is preferably 0.5 to 30% by mass, more preferably 1 to 20% by mass, and 2 to 10% by mass. More preferably. If the content is less than 0.5% by mass, the strength and rigidity may be insufficient, and if it exceeds 30% by mass, the required denseness may not be ensured.

  In the base fabric for heat insulating face material of the present invention, synthetic fibers other than the fibrous binder can be added. These synthetic fibers include polyester, acrylic, polyolefin, polyvinyl alcohol, wholly aromatic polyester, wholly aromatic polyester amide, polyamide, semi-aromatic polyamide, wholly aromatic polyamide, wholly aromatic polyether, wholly aromatic polycarbonate, polyimide. , Polyamideimide (PAI), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), poly-p-phenylenebenzobisoxazole (PBO), polybenzimidazole (PBI), polytetrafluoroethylene (PTFE), ethylene- An appropriate amount of single fibers or composite fibers made of a resin such as a vinyl alcohol copolymer may be contained alone or in combinations of two or more. Moreover, you may contain what divided | segmented various split type composite fibers. Among these, polyester, acrylic, polyolefin, and polyvinyl alcohol are preferable, and polyester and polyvinyl alcohol are more preferable.

  In addition to the above, the anionic, nonionic, cationic or amphoteric retention improver, filter, and the like, which are conventionally used within the range not impairing the desired effects of the present invention, are included in the base fabric for heat insulating face material of the present invention. A liquid agent, a dispersant, a paper strength improver, and a sticking agent are appropriately selected and used as necessary. In addition, internal aids for papermaking such as pH adjusters, antifoaming agents, pitch control agents, slime control agents, etc. It is also possible to add agents appropriately depending on the purpose.

  In general, in the case of paper composed of cellulose fibers, the physical strength of the base paper can be improved by adding a paper strength improver, but when cellulose fibers and glass fibers are mixed, the cellulose fibers are derived from waste paper In this case, since the ionic state of the fiber surface is not uniform, the fixing of the paper strength improver and the effect thereof may not be sufficiently exhibited. However, in the base fabric for a heat insulating surface material of the present invention, at least a part of the fibrous binder is melted, and the physical strength is obtained by melting and bonding the fibrous binders or the fibrous binder to the cellulose fiber and the glass fiber. And improvement in rigidity can be achieved.

40-400 g / m < ² > is preferable, as for the basic weight in the base fabric for heat insulating face materials of this invention, 60-300 g / m < ² > is more preferable, and 80-200 g / m < ² > is still better. If it is less than 40 g / m ² , sufficient mechanical strength and dimensional stability may not be obtained. When it exceeds 400 g / m ² , when it is bonded to both surfaces of the foamed plastic heat insulating material, the basis weight of the product becomes heavy, the light weight characteristics may be lost and the workability may be inferior.

  100-700 micrometers is preferable, as for the thickness of the base fabric for heat insulating face materials of this invention, 200-600 micrometers is more preferable, and 300-500 micrometers is still more preferable. If it is less than 100 μm, sufficient mechanical strength and dimensional stability may not be obtained. If it is thicker than 700 μm, workability may be inferior when bonded to both surfaces of the foamed plastic heat insulating material.

  The base fabric for a heat insulating surface material of the present invention includes a circular paper machine, a long paper machine, a short paper machine, a slanted paper machine, a combination paper machine in which the same or different types of paper machines are combined. It can manufacture by the method of using and making paper. In addition to the fiber raw material, a dispersant, a paper strength enhancer, a thickener, an inorganic filler, an organic filler, an antifoaming agent, and the like are appropriately added to the raw material slurry as necessary. Prepare the raw slurry to a solid content concentration of about. This raw material slurry is further diluted to a constant concentration for papermaking. Next, the paper web is nipped by a press roll or the like, and then, using a heating device such as a hot air dryer, a heating roll, or an IR heater, moisture is removed and the fibrous binder is melted to increase the strength. To express. As the drying temperature at this time, when the core-sheath type heat-fusible fiber is used, the core part of the core-sheath type heat-fusible short fiber is at or above the temperature at which the fiber sheath part melts or softens. It is preferable that the temperature be lower than the temperature at which other contained fibers melt, soften or decompose. Moreover, when the wet heat adhesive fiber is used, it is preferable that the temperature of the wet paper web can be sufficiently removed and the strength can be developed.

  The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to the examples. In the examples, “%” and “part” represent “% by mass” and “part by mass”, respectively, unless otherwise specified. The measuring method of the physical property described in the Example and the comparative example was shown below.

1) Basis weight It measured by the method of JISL1096 description. The unit is g / m ² .

2) Thickness It was measured by the method described in JIS L 1096. The unit is μm.

3) Physical strength The longitudinal breaking strength was measured in accordance with the method described in JIS L 1096 as an index of physical strength. The evaluation criteria are as follows.
A: Strong tensile strength, good workability, no problem in practical use.
Δ: The tensile strength is slightly weak, but there is no practical problem.
X: The tensile strength is weak, it is difficult to process, and there are practical problems.

4) Rigidity Flexural rigidity was measured according to the method described in JIS-P8125 (stiffness test method using a paperboard Taber stiffness tester) as an index of stiffness. The evaluation criteria are as follows.
○: High rigidity, good workability, no problem in practical use.
Δ: The rigidity is slightly low, but there is no practical problem.
X: The rigidity is weak, it is difficult to process, and there is a problem in practical use.

Example 1
100% of old newspaper and magazine paper is defibrated with a drum pulper, removed foreign matter, deinked with an air diffuser, and dehydrated to 1.8% H ₂ O ₂ and NaOH 2.0% and 0.5% Na ₂ SiO ₃ were added, bleached at 60 ° C. for 3 hours, and deinked with an air diffuser to obtain deinked pulp A (freeness 340 ml CSF). . Deinked pulp A as cellulose fiber, 9 μm × 6 mm chopped strand glass fiber as glass fiber, and 2.2 dt × 5 mm core-sheath type heat-fusible fiber as fiber binder (core: polyethylene terephthalate / sheath) : Polyester copolymer, sheath melting point: 110 ° C., core melting point 260 ° C.) were each added to 60/30/10 in order to prepare a 1% aqueous slurry. Using this aqueous slurry, the web is made with a long paper machine, the wet web is dehydrated with a press roll, and then heated and dried at 135 ° C., which is equal to or higher than the sheath melting point of the fibrous binder. A base fabric for a heat insulating surface material of Example 1 was produced by melt-bonding cellulose fiber and glass fiber. In Example 1, it was observed that at least a part of the fibrous binder was melted and the fibrous binders, and the fibrous binder, the cellulose fibers, and the glass fibers were melt bonded.

(Example 2)
Deinked pulp A as the cellulose fiber, 9 μm × 6 mm chopped strand glass fiber as the glass fiber, and 1.1 dt × 3 mm polyvinyl alcohol fiber as the fiber binder in a blend of 65/30/5 each in water sequentially Addition and mixing were performed to prepare a 1% aqueous slurry. Using this aqueous slurry, the web is made with a long paper machine, the wet web is dehydrated with a press roll, and then heat-dried at 115 ° C., and the fibrous binders or fibrous binders and cellulose fibers and glass fibers are combined. The base fabric for heat insulating surface material of Example 2 was produced by melt bonding. In Example 2, it was observed that at least a part of the fibrous binder was melted and the fibrous binders, and the fibrous binder, the cellulose fibers, and the glass fibers were melt bonded.

Example 3
100% of used newspaper and magazine paper was defibrated with a drum pulper to obtain used paper pulp B from which foreign matter had been removed. Waste paper pulp B as cellulose fiber, glass wool fiber of 4 μm × 5 mm as glass fiber, and core / sheath type fusible fiber of 2.2 dt × 5 mm as fiber binder (core: polyethylene terephthalate / sheath: polyester) Polymer, sheath melting point: 110 ° C., core melting point 260 ° C.) were each added to 60/30/10 in order to prepare a 1% aqueous slurry. Using this aqueous slurry, the web is made with a long paper machine, the wet web is dehydrated with a press roll, and then heated and dried at 135 ° C. above the sheath melting point of the fibrous binder. The binder, cellulose fiber, and glass fiber were melt-bonded to produce a base fabric for a heat insulating surface material of Example 3. In Example 3, it was observed that at least a part of the fibrous binder was melted and the fibrous binders, and the fibrous binder, the cellulose fibers, and the glass fibers were melt bonded.

Example 4
Waste paper pulp B as cellulose fiber, 4 μm × 5 mm glass wool fiber as glass fiber, 1.1 dt × 3 mm polyvinyl alcohol fiber as fiber binder, 65/30/5 respectively, and added and mixed sequentially in water. A 1% strength aqueous slurry was prepared. Using this aqueous slurry, the web is made with a long paper machine, the wet web is dehydrated with a press roll, and then heat-dried at 115 ° C., and the fibrous binders or fibrous binders and cellulose fibers and glass fibers are combined. The base fabric for heat insulating surface material of Example 4 was produced by melt bonding. In Example 4, it was observed that at least a part of the fibrous binder was melted and the fibrous binders, and the fibrous binder, the cellulose fibers, and the glass fibers were melted and bonded together.

(Comparative Example 1)
Deinked pulp A as cellulose fiber, 4 μm × 5 mm glass wool fiber as glass fiber, and 2.2 dt × 5 mm polyethylene terephthalate (PET) single fiber (melting point 260 ° C.) as synthetic fiber to 60/30/10, respectively. A 1% aqueous slurry was prepared by adding and mixing in water. Using this aqueous slurry, a web was made with a long paper machine, the wet web was dehydrated with a press roll, and then heat-dried at 135 ° C. to prepare a base fabric for a heat insulating surface material of Comparative Example 1. In Comparative Example 1, a state in which the cellulose fiber and the glass fiber or the synthetic fiber were fusion bonded to each other was not observed.

(Comparative Example 2)
Waste paper pulp B as the cellulose fiber, glass wool fiber of 4 μm × 5 mm as the glass fiber, and 2.2 dt × 5 mm PET single fiber (melting point 260 ° C.) as the synthetic fiber in 60/30/10 each in order Addition and mixing were performed to prepare a 1% aqueous slurry. Using this aqueous slurry, a web was made with a long paper machine, the wet web was dehydrated with a press roll, and then heat-dried at 135 ° C. to prepare a base fabric for a heat insulating surface material of Comparative Example 1. In Comparative Example 2, a state in which the cellulose fiber and the glass fiber or the synthetic fiber were fusion bonded to each other was not observed.

  About the base fabric for heat insulating surface materials obtained in said Examples 1-4 and Comparative Examples 1-2, it evaluated by the evaluation test mentioned above, and the result is shown in Table 1 Table 2.

  From Table 1, it turns out that the base fabric for heat insulating surface materials of this invention is excellent in physical strength and rigidity as shown in Examples 1-4. On the other hand, as shown in Comparative Examples 1 and 2, when the type of fiber constituting the base fabric is out of the scope of the present invention, the physical strength and rigidity are large compared to the base fabric for heat insulating face material of the present invention. It turns out that it is inferior and cannot be put into practical use.

  As a utilization example of the present invention, a base fabric for a face material of a foamed plastic heat insulating material such as a bead method polystyrene foam, an extrusion method polystyrene foam, a rigid urethane foam, a phenol foam, a polyethylene foam or the like is suitable.

Claims (3)

  Contains cellulose fiber, glass fiber, and fibrous binder derived from waste paper pulp, and at least part of the fibrous binder is melted, and the fibrous binders or the fibrous binder and cellulose fiber and glass fiber are melt bonded. Base fabric for foamed plastic heat insulating surface material, which is a non-woven fabric.   The base fabric for a foamed plastic heat insulating surface material according to claim 1, wherein the fibrous binder is a core-sheath type heat-fusible fiber.   The base fabric for a foamed plastic heat insulating surface material according to claim 1, wherein the fibrous binder is a polyvinyl alcohol fiber.