JPH09268491A - Glass fiber mixed paper - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide an intermediate base fabric for a cushion floor material that does not use a release paper and a sealing process, which have been required in the prior art. SOLUTION: Front surface 70 to 85 g / m ² , back surface 7 to 11
It has a two-layer structure of g / m ² , 4 to 10% by weight of polyethylene synthetic pulp on the surface and 40 to 40% of rayon fiber on the back surface.
60% by weight blended, Frazier air permeability 10-20cc
/ Cm ² / s glass fiber mixed paper. [Effect] Without using release paper or sealing process, PVC sol is coated on both sides of the glass fiber mixed paper, there is no strike-through after coating with PVC sol, the surface is flat and the interlayer strength is a problem. Cushion flooring without.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass fiber mixed paper produced by wet papermaking, and relates to a glass fiber mixed paper used as an intermediate base fabric for a cushioning floor material for light walking which is coated with foamed vinyl chloride sol.

[0002]

2. Description of the Related Art As a cushioning floor material for light walking, a method of using a glass fiber mixed paper as a backing material (= backer material base cloth) and coating foamed PVC sol on it, and a glass fiber paper as an intermediate base cloth There is a method of applying foamed vinyl chloride sol on both sides of the glass fiber paper. The former is the mainstream, and it is used by attaching it to the floor surface with an adhesive. The latter is attached to the floor surface with an adhesive or used as a floor laying. Since it can be laid down, it does not require construction and has the advantage of being easily used at home.

The glass fiber paper used for the conventional intermediate base cloth is
A glass fiber having a diameter of 5 to 15 μm and a length of 3 to 20 mm is formed into a sheet by a wet papermaking method. Other than glass fiber, it is mainly composed of PVA fiber, PVA, or a binder such as vinyl acetate. Since the fiber is only glass fiber and the basis weight is as thin as 30 to 50 g / m ² , the quality is high and the air permeability is high. Frazier air permeability (JIS L
-1096) has a high air permeability of 300 cc / cm ² / s or more, and therefore has a very high viscosity when producing a cushion floor material (a B-type viscometer has a viscosity of 3,000 to 10,000 cp).
s) has good permeability. By coating the both sides of the glass fiber paper of the intermediate base cloth with vinyl chloride sol, when the vinyl chloride sol penetrates, the vinyl sol above and below the glass fiber paper adheres to each other to provide interlayer strength.

In the method for producing a cushion floor material from an intermediate base cloth, a step release paper is used as a support for the floor material, first, a vinyl sol is coated on the surface of the step release paper, and then the base cloth is dropped on the surface. A method in which the floor material is peeled off from the release paper after printing and foaming by submerging it in polyvinyl chloride sol, heating it once and gelling it, and then coating it with vinyl chloride sol. First, a method of sealing, heating and gelling a base cloth with polyvinyl chloride sol to form a sealing sheet, and coating vinyl chloride sol on and under the sealing sheet, printing and foaming. There are two methods, which is expensive because it consumes a large amount of release paper, and PVC sol leaks from the base cloth in the sealing process and the process becomes dirty. , There is a problem.

Further, the glass fiber-mixed paper used as the backer material cannot be used as an intermediate base cloth because the backside has no permeability of the vinyl chloride sol and the interlayer strength of the upper and lower vinyl chloride layers does not appear.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides an intermediate base cloth which does not use the release paper or the sealing step which have been required in the prior art, and can reduce the cost and improve the production efficiency. It is what An object is to provide an intermediate base cloth that can meet the following four requirements. Being a support without leakage of PVC sol to the back side. Permeability of PVC sol from the back side is good. There must be interlaminar strength of PVC after coating with PVC sol. Both the front and back surfaces after applying the PVC coating should be flat.

[0007]

In the present invention, an intensive study was conducted on what an intermediate base cloth should be in order to form a cushion floor material without using a release paper or a sealing process. As a result, a glass fiber-blended paper was devised in which the permeation of PVC sol from the back side was good, and the surface was clogged and the permeation of PVC sol was small. Therefore, a two-layer structure of a front surface and a back surface is used, and the front surface has a large basis weight to close the eyes and the back surface has a small basis weight to open the eyes. The one-layer structure is not preferable because permeation of the vinyl chloride sol from the back surface is poor. In addition to glass fiber, PVA fiber on the surface
Pulp, SBR latex, vinyl chloride latex, calcium carbonate, polyethylene synthetic pulp, the back side is made of pulp, PVA fiber, rayon fiber, and PVC sol is applied to the back side of PVC sol in the process of coating front side → back side, back side → front side There is no omission in the polyethylene synthetic pulp gelling oven (usually 180 ~ 200 ℃) and foaming oven (usually 20
It melts with heat of 0 to 230 ° C.) and adheres to vinyl chloride, and the penetration of the vinyl chloride sol from the back side is good, so the interlayer strength of the vinyl chloride after heating and gelation appears. This will be described in detail below.

The layer structure of the glass fiber mixed paper of the present invention has a basis weight of 70 g / m ^{2 to} 85 g / m ^{2 on the} front side and a basis weight of 7 g / m ^{2 on} the back side.
It consists of two layers of m ^{2 to} 11 g / m ² . The Frazier air permeability is 10 to 20 cc / cm ² / s. Surface weight 70g
If it is less than / m ² , the vinyl chloride sol will escape to the back surface, which is not preferable, and if it exceeds 85 g / m ² , the eyes will be clogged and the permeability of the vinyl chloride sol will deteriorate, which is not preferable. Frazier air permeability is 10c
If it is less than c / cm ² / s, the eyes will be clogged and the permeability of the vinyl chloride sol will be poor. If it exceeds 20 cc / cm ² / s, the vinyl chloride sol will escape to the back side, which is not preferable.

The surface layer will be described. It is necessary to close the eyes in order to prevent leakage of the vinyl chloride sol to the back side and to make the surface quality after applying the vinyl chloride sol flat. Glass fiber (fineness 5
55% by weight or more) and other than pulp, PVA fiber, polyethylene synthetic pulp 4 to 10% by weight, SBR latex, vinyl chloride latex, and calcium carbonate. Since the pulp is a flat fiber, the surface quality is flat, and the pulp, calcium carbonate, and polyethylene synthetic pulp clog the eyes, and the vinyl chloride sol does not escape to the back side. The PVA fiber and SBR latex increase the heat resistance strength, and the vinyl chloride latex and polyethylene synthetic pulp increase the adhesiveness to the vinyl sol. Polyethylene synthetic pulp does not melt by controlling the dryer temperature to a temperature lower than the melting point of the polyethylene synthetic pulp at the stage of papermaking, and melts when it is gelated / foamed after coating with PVC sol and adheres to PVC to form a cushion. The interlaminar strength as a flooring material comes out.

The glass fiber of the surface layer will be described. If the fineness of the glass fiber is smaller than 5 μm, the eyes are clogged too much, and it becomes difficult for the back surface to penetrate when applying the vinyl chloride sol, which is not preferable. When it is thicker than 10 μm, the eyes are too wide to open to the back surface when the vinyl chloride sol is applied to the surface, which is not preferable. If the fiber length is longer than 15 mm,
It is not preferable because the dispersibility of the fiber is deteriorated, the number of fibers is reduced, the number of contacts with the binder is reduced, and the strength is reduced. If the length is shorter than 5 mm, the tensile / tear strength becomes weak, which is not preferable. The glass fiber is mixed in an amount of 55% by weight or more.
If it is less than 55% by weight, the dimensional stability after gelling and foaming after coating with PVC sol is lowered, which is not preferable.

The polyethylene synthetic pulp of the surface layer will be described. It is a high-density polyethylene-based synthetic pulp and is fibrillated. Fiber length is 0.8-1.6m
m, the width of the fiber is 1 to 15 μm, and the freeness is 0.5 to 2.0 seconds / g according to TAPPI T221, which is effective for clogging. If the concentration is adjusted to 1.0% or less with warm water having a temperature of 50 ° C. or higher, it can be dispersed with pulper. The dryer temperature is controlled below the melting point of the polyethylene synthetic pulp so that it will not melt during the papermaking process. It melts by heating during gelling / foaming after coating with PVC sol and adheres to PVC to provide interlayer strength as a cushion floor material. Since it is thermoplastic, its heat resistance strength becomes weak. If the amount of polyethylene synthetic pulp is less than 4% by weight, the adhesion to vinyl chloride is weak, and if it exceeds 10% by weight, the heat resistance strength becomes weak and the printed pattern is misaligned or stretched due to the heat of gelation / foaming after coating with PVC sol. It is not preferable because it causes trouble.

The SBR latex, vinyl chloride latex and calcium carbonate for the surface layer will be described. The eyes are filled with calcium carbonate, the adhesiveness with the vinyl chloride sol is improved with the vinyl chloride type latex, and the heat resistance strength is imparted with the SBR latex. SB
R latex and vinyl chloride latex are used as a binder of calcium carbonate and agglomerated with polyamide epichlorohydrin resin to form flocs to improve the yield of papermaking from the Fourdrinier. Used internally, sprayed between layers, or used in combination with internal addition and spraying.

The back layer will be described. The fiber mixture is composed of pulp, PVA fiber, and rayon fiber having a fineness of 1.5 to 4.0 denier. By increasing the flatness with pulp, increasing the heat resistance strength with PVA fiber, opening the eyes with rayon fiber to increase the permeability of PVC sol, the PVC sol escapes from the back layer to the front layer and adheres to the polyethylene synthetic pulp. Increases the interlayer strength of PVC. Since the rayon fiber is a circular fiber, if the fineness is thicker than 4.0 denier, the flatness of the surface is deteriorated and the surface quality after coating with vinyl chloride sol is unfavorable. 40-60% by weight of rayon fiber is blended. If it is less than 40% by weight, clogging is caused and the penetration of the vinyl chloride sol is deteriorated, which is not preferable. If it exceeds 60% by weight, the flatness of the surface is deteriorated and the surface quality after coating with the vinyl chloride sol is deteriorated, which is not preferable. Basis weight is 7
The range of up to 11 g / m ² is preferred. If it is less than 7 g / m ² , the permeability of the vinyl chloride sol is improved, but it is not preferable because it is difficult to fabricate paper and defects are likely to occur and the flatness of the surface is deteriorated.
If it exceeds 11 g / m ² , the permeability of vinyl chloride sol is reduced, the adhesion with vinyl chloride is weakened, and the interlayer strength as a floor material is reduced,
Not preferred.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

Comparative Example 1 Glass fibers (9 μ × 6 mm, manufactured by Asahi Fiber Glass) were dispersed as follows. To the pulper, add water and nonion NS-206 (made by NOF CORPORATION) as an initial dispersant to 3.0% of the glass fiber gloss and stir, then add the glass fiber,
Stir for 15 minutes. After that, SN Dispersand 5034 (manufactured by San Nopco) was used as a dispersion stabilizer against the glass fiber gloss 4.
%, And then add high polymer polyacrylamide aqueous solution Acrypers L (made by Diafloc) to glass fiber 1.5.
% (Solid) was added, and the mixture was stored in a state of being stirred with a reciprocal reversing stirrer (Agitator manufactured by Shimazaki Seisakusho). (Hereinafter, the reciprocating reciprocating stirrer (agitator manufactured by Shimazaki Seisakusho) shall be used as the stirrer.)

NBKP Kamloops (freeness 470 mlcsf) and PVA fiber (VPB107-1 × 3) after beating with another pulper
, Melting point 70 ° C., made by Kuraray) and mixed and dispersed in water at a ratio of 75/25 to give Acripaz L 0.5% to fiber (solid)
Added, stirred and stored.

SBR latex (T-241
Polyamide epichlorohydrin resin (3, made by Japan Synthetic Rubber), calcium carbonate (NS100, Nitto powder), vinyl chloride latex (Zeon 351, made by Nippon Zeon) are mixed and dispersed in water at a ratio of 40/50/10. Polyfix 201, Showa High Polymer) was added to the total solid content of the latex in an amount of 6% to cause aggregation, and then the mixture was stirred and stored.

As a surface layer, the above glass / NBKP / PV
A / T-2413 / NS100 / Zeon 351 is 54/27/9/4
The mixture was mixed before the entrance of the primary screen so as to have a ratio of / 5/1 and sent to a Fourdrinier paper machine to form a web having a solid content of 80 g / m ² .

As the back layer, NBKP Kamloops (freeness 470 mlcsf) and PVA fiber (VPB107-1 × 3) after beating were used.
) Is mixed and dispersed in water at a ratio of 90/10, and 0.5% (solid) of Acripers L is added to the fiber and stored by stirring.
It was sent to a cylinder paper machine to form a web having a solid content of 10 g / m ² .

As described above, the surface layer 80 g / m ² and the back surface layer 1
A glass fiber mixed paper having a total basis weight of 0 g / m ² of 90 g / m ² was made by a Fourdrinier / Cylinder machine and a Yankee dryer.

Comparative Example 2 Glass fiber (9 μ × 13 mm, manufactured by Asahi Fiber Glass)
Was performed as follows. After adding water and 3.0% of nonionic NS-206 (manufactured by NOF CORPORATION) as an initial dispersant to glass fiber to the pulper and stirring, glass fibers were added and stirred for 15 minutes. After that, SN Dispersand 5034 (manufactured by San Nopco) was added as a dispersion stabilizer to glass fiber gross 4%, and then high molecular weight polyacrylamide aqueous solution Acrypers L (manufactured by Diafloc) was added 1.5% to glass fiber (solid). , Stirred and stored.

With another pulper, PVA fiber (VPB107-
1 x 3) is dispersed in water and Acrypers L is used for PVA.
Fiber 1.0% (solid) was added and stored by stirring.

Glass fibers and PVA fibers were mixed in a ratio of 95/5 in front of the primary screen and made into a 45 g / m ² sheet with a Fourdrinier paper machine, and then PVA binder (Poval 117, manufactured by Kuraray Co., Ltd.). ) And a polyamide-epoxy resin (Sumiraz 675, manufactured by Sumitomo Chemical Co., Ltd.) dissolved at a ratio of 93/7, impregnated with 5 g / m ² and dried with a hot air circulation type air dryer to obtain a basis weight of 50 g / m ² . A glass fiber paper consisting of one layer was produced.

Example 1 Glass fibers (9 μ × 6 mm, manufactured by Asahi Fiber Glass) were dispersed in the same manner as in Comparative Example 1, stirred, and stored. Another pulper beats NBKP Kamloops (freeness 470mlcsf)
And PVA fiber (VPB107-1 × 3) were mixed and dispersed in water at a ratio of 5/3, and 0.5% (solid) of Acripers L was added to the fiber and stirred to store. As in Comparative Example 1, SBR latex (T-2413), calcium carbonate (NS100), and vinyl chloride latex (Zeon 351) were mixed and dispersed in water at a ratio of 40/50/10 in another tank, and polyamide epichlorohydrin system was prepared. The resin (Polyfix 201) was added with 6% of the gross solid content of the latex to coagulate, and then stirred and stored.

Warm water at 60 ° C. was placed in another pulper, and polyethylene synthetic pulp (SWP E-790, Mitsui Zera Bag) was added to the hot water to a concentration of 1.0% (solid) and thirty pieces were separated. , A disintegrator (Top Finer, manufactured by Aikawa Tekko Co., Ltd.), sent to a storage tank, and stirred for storage.

The above glass fibers, NBKP and PVA fibers, S
The raw material of each storage tank for BR latex, calcium carbonate, vinyl chloride latex, and polyethylene synthetic pulp is glass in front of the entrance of the primary screen: NBKP: PVA: SWP:
T-2413: NS-100: Zeon 351 = 60/16/10/4 /
The mixture was mixed so as to be 4/5/1 and sent to a Fourdrinier paper machine to form a web having a solid content of 80 g / m ² as a surface layer.

NBKP Kamloops (freeness 470 mlcsf) and PVA fiber (VPB107-1 × 3) after beating in another tank
), Rayon fiber 1.5 denier 5 mm (manufactured by Daiwabo)
Was mixed in a ratio of 50/10/40 and sent to a cylinder paper machine to form a web having a solid content of 10 g / m ² as a back layer.

As described above, the surface layer is 80 g / m ² , the back surface layer 1
A glass fiber mixed paper having a total basis weight of 0 g / m ² of 90 g / m ² was made by a Fourdrinier / Cylinder machine and a Yankee dryer.

Comparative Example 3 The surface layer of Example 1 was 80 g / m ² and the back surface layer was 10 g / m ^2.
A total basis weight of 90 g / m ² was used as one layer, and the compounding amounts of the respective raw materials were set to be exactly the same as in Example 1, and a glass fiber mixed paper was made by a Fourdrinier paper machine and a Yankee dryer.

[0030] Comparative Example 4, Example 2-3, Comparative Example 5 the rear surface of the layer and respectively 6,7,11,12g / m ^2, except that the total basis weight 86,87,91,92g / m ² The glass fiber-mixed papers of Comparative Example 4, Examples 2 to 3 and Comparative Example 5 were produced in exactly the same manner as in Example 1.

Comparative Example 6, Examples 4 to 5 and Comparative Example 7 The surface layers were 66, 70, 85 and 91 g / m ² , respectively,
The back side layer is 9 g / m ^2, and the total basis weight is 75, 79, 94,
Same as Example 1 except that 100 g / m ² was used,
The glass fiber mixed papers of Comparative Example 6, Examples 4 to 5 and Comparative Example 7 were produced.

Comparative Example 8, Examples 6 to 7, Comparative Example 9 Except that the composition of the surface layer is set to 3, 7, 10, 13% by weight of SWP and 17, 13, 10, 7% by weight of NBKP, respectively. Is exactly the same as in Example 1, and Comparative Example 8 and Examples 6 to 7,
A glass fiber mixed paper having a total basis weight of 90 g / m ^{2 in} Comparative Example 9 was produced.

Example 8 and Comparative Example 10 The composition of the backside layer was made of rayon fiber 4 denier 6 mm, respectively.
(Daiwabo) 40% by weight, rayon fiber 6 denier 10
mm (manufactured by Daiwabo Co., Ltd.) The same as Example 1 except that the total basis weight of Example 8 and Comparative Example 9 was 90 g / m, except that the amount was 40% by weight.
The glass fiber mixed paper of No. ² was produced.

COMPARATIVE EXAMPLE 11, EXAMPLE 9, COMPARATIVE EXAMPLE 12 The composition of the back layer was made of rayon fiber 1.5 denier 5 m, respectively.
m (manufactured by Daiwabo Co., Ltd.) was the same as that of Example 1 except that the content was 35, 60, and 65% by weight, and the glass fiber mixed papers having a total basis weight of 90 g / m ² of Comparative Examples 11, 9, and 12 were prepared. Paper-made.

Tables 1 to 5 show Examples 1 to 9 and Comparative Examples 1 to 1.
2 shows the composition and basis weight of the two layers of the front surface and the back surface.

Tables 6 to 7 show Examples 1 to 9 and Comparative Examples 1 to 1.
2 shows the measurement results of physical properties, the interlayer strength and surface flatness of vinyl chloride of the cushion floor material after coating with vinyl chloride sol, and the evaluation result of strikethrough of vinyl chloride sol.

The physical property measurement items are Frazier air permeability (JI
SL-1096) and heat-resistant tensile strength (JIS
It is based on L-1096). Heat-resistant tensile strength is temperature 19
The sample is left in an environment of 0 to 200 ° C. for 3 minutes, and immediately thereafter, the tensile strength of a test piece having a width of 50 mm is measured with a Tensilon tensile tester.
Tensile strength of heat resistance is 10 according to the rule of thumb for manufacturing cushion floor materials.
If it is less than kg / 50 mm, it is deformed by heating during gelation and foaming, which causes inconvenience such as pattern shift. Heat-resistant tensile strength is 10
kg / 50 mm or more is acceptable, and less than is marked as x.

The coating of vinyl chloride sol was performed by the following method. Glass fiber mixed paper (or glass fiber paper) at a temperature of 12
After curing for 1 minute at 0 ° C., place on the glass plate with the surface layer facing up and tape the top. For the sample of the surface, PVC sol for surface (foaming type; viscosity 5,
000 cps) Coating with an applicator bar having a gap of 0.4 mm (coating amount (solid) 500 to 600 g / m ² ). Of the sample was heated in a hot air dryer at 220 ° C for 15 seconds
Gel the PVC sol. Place the sample with the PVCsol-coated side up on a glass plate and tape the top. A non-foaming transparent PVC sol is applied with an applicator bar having a gap of 0.6 mm (the coating thickness becomes 0.2 mm). The sample is heated in a hot air dryer at 220 ° C. for 2 minutes to foam the vinyl chloride foam. Place the sample on the glass plate with the back side up and tape the top. A backside PVC sol (foaming type; viscosity 8,000 cps) is applied with an applicator bar having a gap of 0.4 mm (applied amount (solid) 600 to 700 g / m ² ). The sample is heated in a hot air dryer at 180 ° C. for 2 minutes to foam the vinyl chloride foam. By the above procedure, the cushion floor material using the glass fiber mixed paper (or the glass fiber paper) as the intermediate base fabric is prepared.

Regarding the evaluation of strike-through of the vinyl chloride sol, the surface on the back side of the coated surface is observed as described above and after completion, and it is determined whether or not the strike-through is on the back side. A pigment such as blue may be mixed in the PVC sol for easy viewing.

The evaluation of the flatness of the surface of polyvinyl sol after coating is as follows.
Regarding the surface, after completion of the above, the sample is placed face up on a glass plate and judged visually. For the back side, after the above, the sample is placed on the glass plate with the back side facing up and visually determined. With respect to the flatness of the surface, the front surface and the back surface of Comparative Example 1 were used as a reference, and when the level was better or the same as that of Comparative Example 1, it was determined to be ◯, and when the level was inferior, to x.

The evaluation of the interlaminar strength of the vinyl chloride of the cushion floor material after coating with the vinyl chloride sol was carried out by cutting the cushion floor material after completion of the above into a sample having a width of 50 mm and a length of 200 to 250 mm. Peel on one PVC layer. The tips of the two peeled layers are fixed to the upper and lower chucks of the Tensilon tensile tester, one layer at a time, and the peel strength is measured according to JIS L-1096, and this is taken as the interlayer strength. Interlayer strength at this time is 3k
If g / 50 mm or more, it was judged as O, and if less than 3 kg / 50 mm, it was judged as X. The interlayer strength of 3 kg / 50 mm or more is based on the empirical rule of interlayer strength required for ordinary cushion floor materials.

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

[0045]

[Table 4]

[0046]

[Table 5]

[0047]

[Table 6]

[0048]

[Table 7]

Comparative Example 1 is a backer type glass fiber blended paper, which is clogged (Frazier breathability 1
0.1 cc / cm ² / s) Permeation of PVC sol is small, so when it is used as an intermediate base fabric, the interlayer strength cannot be obtained by coating from both front and back sides of PVC sol, which proves to be impossible. Comparative Example 2 is a glass fiber paper, which has wide open eyes (Fragile air permeability of 354 cc / cm ² / s) and a large amount of PVC sol penetrates, so that PVC sol escapes and flows to the back side, so that the surface is not flat. However, since the amount of permeation of PVC sol into the paper layer is large, the interlayer strength becomes high and the layers cannot be separated.

Example 1 and Comparative Example 3 have the same composition and basis weight, and differ only in that the layer constitution is two layers and one layer. Comparative Example 3
As described above, if the back surface is composed of one layer, the back surface includes circular fibers such as glass fibers, and the back surface has a flatness of x. The back surface is clogged with polyethylene synthetic pulp or calcium carbonate, the permeability of the PVC sol is reduced, and the interlayer strength becomes x.

Examples 1 to 3 and Comparative Examples 4 to 5 show the effect of setting the basis weight of the back net to 6 to 12 g / m ² . When the basis weight of the back surface is less than 7 g / m ² , the paper layer on the back surface is thin and the surface quality deteriorates, so that the flatness of the back surface after coating with vinyl chloride sol becomes x. When the basis weight of the back surface exceeds 11 g / m ² , penetration of the vinyl chloride sol deteriorates and the interlayer strength becomes x.

Examples 4 to 5 and Comparative Examples 6 to 7 show the effects of setting the basis weight of the fourdrinier on the surface to 66 to 91 g / m ² . When the basis weight of the surface is less than 70 g / m ² , the paper layer on the surface becomes thin, and the vinyl sol escapes to the back side and the flatness of the surface becomes poor. Surface basis weight is 8
If it exceeds 5 g / m ² , PVC sol does not penetrate into the paper layer and the interlayer strength becomes x.

Examples 6 to 7 and Comparative Examples 8 to 9 show the effect of setting the content of polyethylene synthetic pulp on the surface to 3 to 13% by weight. If the amount of polyethylene synthetic pulp is less than 4% by weight, the adhesion with vinyl chloride is weak and the interlaminar strength becomes x. As the amount of polyethylene synthetic pulp increases, the eyes become clogged and the heat resistance decreases,
If it exceeds 10% by weight, the permeation of the vinyl chloride sol is lowered, and the interlayer strength becomes x and the heat resistance strength becomes x.

Examples 1 and 8 and Comparative Example 10 show the effect of setting the fineness of rayon to 1.5 to 6 denier. When the rayon fineness is 1.5 denier and 4 denier, there is no problem with the flatness of the back surface. When the fineness is 6 denier, the unevenness of the layer on the back surface becomes large, so that the flatness of the back surface after coating with vinyl chloride sol becomes x.

Example 9 and Comparative Examples 11 to 12 show the effects of changing the amount of rayon 1.5 denier to 35 to 65% by weight. If it is less than 40% by weight, vinyl chloride sol does not penetrate into the paper layer and the interlayer strength becomes x. If it exceeds 60% by weight, the unevenness of the layer on the back surface becomes large, so that the flatness of the back surface after applying the polyvinyl chloride sol becomes x.

Looking at the Frazier air permeability of Examples 1 to 9 and Comparative Examples 1 to 12, if it is less than 10 cc / cm ² / s, the permeability of PVC sol is lowered and the interlayer strength becomes x. 20 cc /
If it exceeds cm ² / s, the vinyl sol will escape to the back side and the flatness will deteriorate. Frazier air permeability is 10 ~ 20cc / cm ²
It is necessary to be in the range of / s.

[0057]

Industrial Applicability As in the present invention, a surface having a basis weight of 70 to 85 g / m ² comprising glass fiber, wood pulp, PVA fiber, polyethylene synthetic pulp 4 to 10% by weight, calcium carbonate, SBR latex, and vinyl chloride latex. Layer, wood pulp, PVA fiber, rayon fiber 1.5 to 4 denier 40 to 60% by weight, grammage of 7 to 11 g / m2, and ^two layers of the backside layer of Frazier air permeability 10 to 20 cc /
If a glass fiber mixed paper having a cm ² / s is provided, the front and back surfaces of the glass fiber mixed paper are coated twice with vinyl chloride sol, the back surface does not come off, the surface is flat, and the interlayer strength of vinyl chloride is high. Cushion flooring can be produced without problems. This is a new method using glass fiber mixed paper as an intermediate base fabric. Conventionally, there have been only two methods, that is, using a glass fiber paper as an intermediate base cloth, using a process release paper, or performing a sealing process. The present invention has solved the high cost of process release paper and the low efficiency of lengthening the production line of the sealing process. The glass fiber mixed paper was used only as a backer material, but it became possible to use it as an intermediate base fabric.

Claims (1)

[Claims] 1. Glass fiber, wood pulp, PVA fiber,
Basis weight consisting of polyethylene synthetic pulp, calcium carbonate, SBR latex, vinyl chloride latex 70-85 g /
A glass fiber mixed paper comprising two layers of a back surface layer having a basis weight of 7 to 11 g / m ² consisting of an m ² surface layer, wood pulp, PVA fiber, and rayon fiber 1.5 to 4 denier, The front layer contains 4 to 10% by weight of polyethylene synthetic pulp, and the back layer contains 40 to 60% by weight of rayon fiber.
Frazier air permeability (JIS L-1096) is 10-2
A glass fiber mixed paper, characterized in that it is 0 cc / cm ² / s.