JP3039292B2 - Base paper for heat-sensitive stencil printing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sensitive stencil sheet perforated by a flash lamp or infrared ray irradiation with a halogen lamp, a xenon lamp, a flash bulb or the like, a pulsed irradiation with a laser beam or the like, or a perforated plate made by a thermal head or the like. is there.

[0002]

2. Description of the Related Art Conventionally, as heat-sensitive stencil base paper, natural fibers, chemical fibers or synthetic fibers or a thin paper, a nonwoven fabric, a gauze or the like obtained by mixing a thermoplastic resin film such as a polyester film, a vinylidene chloride film and a polypropylene film with a natural fiber, a synthetic fiber or a synthetic fiber. (Japanese Patent Laid-Open Nos. 51-2512 and 57-18) are known.
No. 2495).

[0003] However, these conventional heat-sensitive stencil base papers have the following disadvantages. That is, (1) Since the film and the porous support are bonded together using an adhesive, the transmission of the ink is hindered by the adhesive, resulting in poor image clarity.

(2) The adhesive used itself, for example, an acrylic resin or a vinyl acetate resin adhesive is easily softened, swelled and dissolved by a printing ink, so that it has poor ink resistance and is thermally cured. When a non-curable adhesive is used, the uncured material tends to remain, so that the thermal head is likely to fuse during plate making.When using a chlorine-based adhesive, toxic chlorine is generated by heating the thermal head. There are problems such as release.

(3) Further, when an adhesive is used, a bonding step is required in the production process of the base paper, and a solvent recovery facility is required because a solvent is used at the time of applying the adhesive. The cost is high.

(4) The use of adhesives and solvents deteriorates the working environment. It is also not preferable from the viewpoint of global environmental protection.

In order to improve these drawbacks, proposals have been made to minimize the amount of adhesive used (see, for example, JP-A-58-147396, JP-A-Hei.
At present, however, the above-mentioned drawbacks have not been completely eliminated.

As a method without using an adhesive, Japanese Patent Laid-Open Publication No. Hei 4-212891 is characterized in that a synthetic fiber is dispersed on one surface of a thermoplastic resin film and a fiber layer formed by thermocompression is formed. Heat-sensitive stencil paper has been proposed. However, this method has a length of 5
Since the method is a method in which synthetic fibers having a diameter of 0 mm or less are sprayed by wind force or static electricity, the dispersion of the fibers becomes non-uniform, so that the ink permeability becomes uneven and the image clarity becomes insufficient. Further, in this method, since the adhesiveness between the resin film and the fiber layer is not always sufficient, there is a problem that wrinkles and tears are likely to occur during film transport. In order to complete the adhesion, mix the binder fiber into the fiber layer,
Although it has been proposed to apply a small amount of an adhesive to the film surface, the use of a binder fiber or an adhesive impairs the ink permeability and consequently has a disadvantage in that the image clarity is reduced. In order to eliminate such disadvantages,
At present, there is a demand for a heat-sensitive stencil sheet that does not use any adhesive or binder.

On the other hand, Japanese Patent Application Laid-Open No. 61-276048 proposes a mesh fabric for a printing screen comprising a core-sheath type composite filament having a sheath component having good adhesiveness and a core component having good dimensional stability. However, this method is expensive since it is formed into a mesh fabric and then combined with a film. Furthermore, monofilaments have a large fineness, multifilaments have fiber bundles, and woven interlaced parts may impair the perforation of the film or impair ink permeability, resulting in poor image clarity. Did not.

[0010]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and integrates a film and a porous support without using an adhesive to provide excellent image clarity, and An object of the present invention is to provide a heat-sensitive stencil sheet having a low production cost.

[0011]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, a specific polyester film and a porous support made of a non-woven fabric of polyester fiber have been bonded to an adhesive. A heat-sensitive stencil printing paper composited without use has been found, and the present invention has been achieved.

The present invention for achieving the above object has the following configuration.

That is, a heat-sensitive stencil printing base paper in which a polyester fiber nonwoven fabric composed of two components having different melting points is fused to one surface of a polyester film, wherein the melting point Tm ₁ (° C.) of the polyester film is low. A heat sensitive stencil characterized in that the melting point Tm ₂ (° C.) of the melting point component and the melting point Tm ₃ (° C.) of the high melting point component satisfy the following relationship, and the polyester fiber nonwoven fabric is fused at the entanglement point of the fibers. It is a printing paper.

Tm ₂ ≦ Tm ₁ −30 Tm ₃ ≧ Tm ₂ +50 Tm ₃ ≧ Tm _{1 The} present invention will be described in detail below.

The heat-sensitive stencil sheet of the present invention is composed of a polyester film and fibers composed of two components having different melting points of polyester, and can be formed only when the melting points of the respective polymers are set as follows.

That is, the low-melting-point component of the fiber becomes an adhesive component between the porous support of the film and the fibrous nonwoven fabric and the fiber-entangled portion. Melting point of low melting point component (Tm ₂ )
Needs to be lower than the melting point (Tm ₁ ) of the film by 30 ° C. or more. Further, the melting point (T
m ₃ ) is 50 times lower than the melting point (Tm ₂ ) of the low melting point component of the fiber.
It is important that the temperature be higher by at least ° C and higher than the melting point (Tm ₁ ) of the film.

If the melting point (Tm ₂ ) of the low melting point component of the fiber is lower than the melting point (Tm ₁ ) of the film by 30 ° C. or more, the adhesiveness is poor. If the difference between the melting point (Tm ₃ ) of the high melting point component of the fiber and the melting point (Tm ₂ ) of the low melting point component of the fiber is less than 50 ° C.,
Deformation occurs during thermal bonding between the film and the fibrous nonwoven fabric, impairing ink permeability during printing. If the melting point (Tm ₃ ) of the high melting point component of the fiber is lower than the melting point (Tm ₁ ) of the film, the heat resistance at the time of perforation is inferior, and the fiber cannot be used as a support.

In particular, in recent years, films having a low melting point have tended to be used for films for heat-sensitive stencils so that they can be perforated with smaller energy in order to increase perforation sensitivity. A precise design is required.

The polyester used for the film and fiber in the present invention is a polyester containing aromatic dicarboxylic acid, aliphatic dicarboxylic acid and diol as main components. Although not particularly limited, preferably from the viewpoint of film forming properties and fiber spinning properties and physical properties, and sensitivity and thermal dimensional stability at the time of perforating the base paper, costs, and the like, for example, terephthalic acid, isophthalic acid, adipic acid and the like An acid component, ethylene glycol, 1,3-butanediol,
And diol components such as 2,2'-bis (4'-β-hydroxyethoxyphenyl) propane. These components can be used as two or more copolymers in view of the design of the melting point of the polymer.

The above-mentioned polyester can be produced by a conventionally known method. For example, a method in which an acid component is directly esterified with a diol component, and then the product of this reaction is heated under reduced pressure to remove the excess diol component and polycondensate to produce a dialkyl acid. There is a method of using an ester, performing a transesterification reaction between the ester and a diol component, and then performing polycondensation in the same manner as described above. At this time, if necessary,
As the reaction catalyst, conventionally known alkali metals, alkaline earth metals, manganese, cobalt, zinc, antimony, germanium, titanium compounds and the like can also be used. Also,
If necessary, a flame retardant, a heat stabilizer, an antioxidant, an ultraviolet absorber, an antistatic agent, an organic lubricant such as a pigment, a dye, a fatty acid ester, a wax, or an antifoaming agent such as a polysiloxane may be added. it can.

Further, lubricity can be imparted depending on the use (especially, polyester for film).
The method for imparting lubricity is not particularly limited, for example, clay, mica, titanium oxide, calcium carbonate, kaolin, talc, inorganic particles such as wet or dry silica,
There are a method of blending organic particles or the like having acrylic acid, styrene, or the like as a constituent, a method of so-called internal particles for precipitating a catalyst or the like to be added at the time of a polyester polymerization reaction, and a method of applying a surfactant.

The film of the present invention can be produced using the above-mentioned polyester by a conventionally known method. For example, a film can be produced by extruding a polymer onto a cast drum by a T-die extrusion method, and then stretching the polymer vertically or horizontally by a roll or a tenter. By adjusting the slit width of the die, the discharge amount of the polymer, and the rotation speed of the cast drum, a film having a desired thickness can be produced.

The porous support comprising a polyester fiber nonwoven fabric sheet according to the present invention can be produced by using the above-mentioned polyester by a conventionally known spunbonding method, papermaking method, or the like.

That is, polymers having different melting points are respectively melted from a compound spinning machine generally used for melt spinning of polyester, and a predetermined amount is measured by a gear pump and discharged from the compound spinneret.

In the spunbond method, a polymer discharged from a die is pulled at a high speed by an air ejector, and the obtained filaments collide with a collision plate to spread the fibers, and are collected in a belt conveyor to form a web. Manufactured. By appropriately setting the polymer discharge amount and the conveyor speed, the basis weight of the web can be arbitrarily set. This web is thermally fixed with a heating roll to obtain a nonwoven sheet. The heat fixation here means that when the sheet is rubbed and loosened by hand, it is adhered to the extent that it is divided into single fibers.
Pressing is performed at an arbitrary temperature of the heating roll.

In the papermaking method, on the other hand, the polymer discharged from the composite die is taken up at a high speed by an air ejector or a roll, and the tow of the fiber is taken up.
After drawing through a hot bath at 0 ° C. or a hot air bath, the tow of the fiber is used), and then cut into about 1 to 5 mm,
Paper can be made into sheets.

The thus-obtained film and fibrous nonwoven fabric are pressed and bonded together while heating to form a heat-sensitive stencil sheet. The method of thermocompression bonding for achieving sufficient adhesion is not particularly limited, but thermocompression bonding using a heating roll is particularly preferable from the viewpoint of processability. Here, sufficient adhesion means
Peeling strength between the film and the fibrous non-woven fabric support from the viewpoint of preventing the occurrence of wrinkles and tears when transporting the heat-sensitive stencil printing paper, as it is an adhesive that does not hinder the handling of the base paper and the conveyance during printing. Is preferably 1 g / cm or more, more preferably 5 g / cm or more.

The polyester fiber nonwoven fabric constituting the heat-sensitive stencil sheet of the present invention is composed of fibers composed of two components having different melting points. After obtaining each fiber with a single-component spinning machine, a method of mixing may be used. However, the two-component polymers described above are each melted, weighed with a gear pump, fed to a die, and combined with the two components by a die. A composite spinning method for producing a composite fiber is more suitable. The composite state is a state where at least the low melting point polymer is on the fiber surface, that is,
Examples include a core-in-sheath type, a bimetal type, and a shape in which a low-melting-point polymer is present in a part of an irregular cross section of a high-melting-point polymer. Further, a state in which fibers of the low melting point polymer and fibers of the high melting point polymer are mixed may be used. From the viewpoint of maintaining the adhesiveness with the film, the ratio of the low-melting polymer in the fiber is
It is preferably at least 5% by weight, more preferably at least 10%. On the other hand, the ratio of the low-melting-point polymer in the fiber is 70% from the viewpoint of maintaining the strength of the fiber and preventing the deformation of the fiber due to the lamination with the film and the deterioration of the image clarity of the print. Or less, more preferably 50% or less.

The fineness of the polyester fiber constituting the polyester fiber nonwoven fabric is preferably not less than 0.3 denier from the viewpoint of suppressing yarn breakage, and is preferably 0.5 denier or more.
It is more preferable that the denier is not less than denier. On the other hand, from the viewpoint of preventing the thickness and the basis weight of the support from becoming nonuniform and making the ink permeability uniform, the fineness is preferably 10 denier or less, more preferably 7 denier or less. .

The fibers constituting the polyester fiber nonwoven fabric which is the porous support constituting the heat-sensitive stencil printing base paper of the present invention may have the same fineness, or may be a mixture of fibers of different finenesses. There may be. Further, a multi-layer structure in which fibers having different fineness are laminated in a stepwise manner may be adopted.

The basis weight of the polyester fiber nonwoven fabric constituting the heat-sensitive stencil sheet of the present invention is preferably ² g / m ² or more, and more preferably 5 g / m ² , from the viewpoint of maintaining the strength as a support. Is more preferred. On the other hand, from the viewpoint of maintaining good ink permeability and improving image clarity, the basis weight is preferably 20 g / m ² or less,
More preferably, it is 15 g / m ² or less.

The polyester film constituting the heat-sensitive stencil printing base paper of the present invention is preferably a biaxially stretched film from the viewpoint of preventing wrinkles and tears during the transfer of the heat-sensitive stencil printing base paper. The thickness of the film is
The thickness is appropriately determined depending on the sensitivity required for the base paper and the like, but is preferably 0.5 μm or more, more preferably 1 μm or more, from the viewpoint of maintaining the form stability.
On the other hand, the thickness is preferably 10 μm or less, more preferably 7 μm or less, and even more preferably 5 or less, from the viewpoint of improving the piercing property in the heat-sensitive stencil and improving the image clarity.

The heat-sensitive stencil sheet of the present invention has a release agent layer on the film surface in order to stabilize the running property during perforation. As the release agent, conventionally known ones composed of silicone oil, silicone resin, fluorine resin, surfactant, petroleum wax, vegetable wax, etc. can be used, and the method of applying these is particularly limited. But not
The coating can be performed using a roll coater, a gravure coater, a reverse coater, a bar coater, or the like.

In the above composition, various additives can be used in combination as long as the effects of the present invention are not impaired. For example, antistatic agents, heat-resistant agents, antioxidants, organic particles, inorganic particles, pigments and the like can be mentioned. Various additives such as a dispersing aid, a surfactant, a preservative, and an antifoaming agent may be added to the coating composition for the purpose of improving dispersibility in water.

[0035]

The present invention will be described below in more detail with reference to examples. In addition, the measuring method measured in this example is described below.

<Melting Point (° C.)> Using a differential scanning calorimeter RDC220 type manufactured by Seiko Denshi Kogyo KK, a 5 mg sample was sampled, and the endothermic curve peak when the temperature was raised from room temperature at a rate of 20 ° C./min. Was determined from the temperature.

<Single fiber fineness (d; denier)> The single fiber fineness during spinning was measured by the following method (1), and the single fiber fineness as a heat-sensitive stencil sheet was measured by the following method (2).

(1) Before forming the fiber into a non-woven fabric sheet, a long fiber for measurement is taken out of a block, 10 samples of 0.9 m length are sampled, and each is weighed to obtain a fineness. did.

(2) Ten photographs were taken at arbitrary positions of the sample with an electron microscope at a magnification of 500 times, and the diameter of any fifteen fibers was measured for each photograph. This was performed on the photograph, and the fiber diameter of a total of 150 fibers was measured. The fineness was determined by setting the density to 1.38 g / cm ³ ,
The average value was shown.

<Fiber weight (g / m ² )> Test piece 20 cm
× 20 cm was taken and its weight was measured and converted to the weight per m ² .

<Evaluation of Adhesion Property> The sample was observed with an optical microscope.

<Evaluation of printability> The prepared stencil sheet for heat-sensitive stencil was supplied to RISOGRAPHIC manufactured by Riso Kagaku Kogyo Co., Ltd., and JIS first-level characters having a character size of 2 mm square were obtained by a thermal head plate making method. And a 5 mm square, a circle (black solid portion) of 2 to 10 mmφ with a black solid inside, and ruled lines of different thicknesses were prepared as originals.

Printing was performed using the plate-making manuscript, and the runnability, the sharpness of characters, the white spots in solid black portions, and the like were evaluated by visual judgment.

If there is no problem in the running property, the character is clear and no black spots appear on the solid black portion, and ○ indicates that the running performance is poor, the character is unclear, and white spots appear on the black solid portion. The results of the evaluation are shown in Table 1 with the symbol △, which is intermediate between の and ×, and which can be used practically.

Example 1 A polyester fiber nonwoven fabric was produced as follows.

As the low melting point component, a melting point (Tm ₂ ) of 190
25% by mole of isophthalic acid copolymerized polyethylene terephthalate at 60 ° C., and 6% by mole of isophthalic acid copolymerized polyethylene terephthalate (melting point Tm ₃ :
245 ° C). The two components were put into a composite spinning machine, and the low melting component was melted with a 250 ° C. melter to dissolve the chips and weighed at 13 g / min with a gear pump. The high melting component was melted with a 280 ° C. melter and 53 g / min with a gear pump. It was weighed and fed to a core-sheath type composite die having a hole diameter of 0.23 mmφ and 66 holes for spinning. The temperature of the flow path and the base of the molten polymer is 280 ° C., and the low melting point component has a sheath (core / sheath = 80 / sheath).
20).

After the polymer discharged from the spinneret is cooled and solidified, it is suctioned at a high speed by an air ejector (air pressure 4 kg / cm ² ), dispersed and collected on a net conveyor through a collision plate, and passed through a hot roll at 90 ° C. To obtain a nonwoven fabric sheet. This nonwoven fabric sheet had a basis weight of 15 g / m ² .
The fineness of the fibers ejected from the air ejector was 2 denier, the breaking strength was 3.5 g / d, and the elongation was 75%.
There was no problem with the processability such as the spinning property.

On the other hand, a polyester film was produced as follows.

Isophthalic acid 1 having a melting point (Tm ₁ ) of 225 ° C.
Using a 4 mol% copolymerized polyethylene terephthalate and a T-die cap temperature of 28 with an extruder having a screw diameter of 40 mm.
Extruded at 0 ° C., cast on a cooling drum having a diameter of 300 mm to form an unstretched film, and heated rolls at 90 ° C.
After stretching four times in the length direction, it is sent to a tenter type stretching machine, stretched four times in the width direction at 95 ° C, and further heat-treated in a tenter at 160 ° C for 5 seconds, and biaxially stretched polyester having a thickness of 2 µm. A film was obtained.

The polyester fiber nonwoven fabric sheet and the biaxially stretched film were laminated and pressed at 150 ° C. using a calender roll. In addition, when determining the temperature of the heating roll of the calender roll, 1 to 90 ° C. to 190 ° C.
A sample was prepared by changing the temperature every 0 ° C, and the state of the film surface, the state of the bonded portion between the film and the fiber, the deformation state of the fiber, and the like were observed with an optical microscope.
In addition, 150 ° C. was optimal for obtaining a film having sufficient fusion between the film and the fiber.

What was obtained above was the deformation of the film,
There was no flattening of the fibers, and the bonded portions between the film and the fibers and the entangled points between the fibers were fused to form a net state.

Further, on the upper surface of the film, a wax-based release agent was weighed after drying with a gravure coater at 0.1 g / g.
m ^{2 was} applied to prepare a heat-sensitive stencil printing base paper.

The base paper was evaluated for printing. The running properties of the base paper were also good, and the printed matter had clear characters and no black solid areas.

Example 2 Polyethylene terephthalate copolymerized with 40 mol% of isophthalic acid having a melting point (Tm ₂ ) of 110 ° C. was used as a low melting point component in polyester fiber, and a high melting point (Tm ₃ ) of 225 ° C. was used as a high melting point component. Using a polyethylene terephthalate copolymerized with 14 mol% of isophthalic acid, the spinning temperature was set to 270 ° C., and a sheet after collecting the conveyer was converted into a sheet according to Example 1, except that a hot roll at 70 ° C. was used. Obtained.

On the other hand, the polyester film has a melting point (T
m ₁ ) A biaxially stretched film was obtained according to Example 1 using polyethylene terephthalate copolymerized with 25% by mole of isophthalic acid at 190 ° C.

Further, the fibrous nonwoven fabric sheet and the biaxially stretched film were laminated to prepare a heat-sensitive stencil printing base paper. The appropriate temperature of the hot roll at the time of bonding was 90 ° C., and the bonding state was as good as that of Example 1.

The printing evaluation of the heat-sensitive stencil sheet was also good.

Comparative Example 1 Polyethylene terephthalate copolymerized with 25 mol% of isophthalic acid having a melting point (Tm ₂ ) of 190 ° C. was used as a low melting point component in polyester fiber, and a melting point (Tm ₃ ) 235 was used as a high melting point component. ° C
According to Example 1, a fibrous nonwoven fabric sheet was obtained using polyethylene terephthalate copolymerized with 10 mol% of isophthalic acid.

On the other hand, the polyester film has a melting point (T
m ₁ ) A biaxially stretched film was obtained according to Example 1 using polyethylene terephthalate copolymerized with 14 mol% of isophthalic acid at 225 ° C.

The thermocompression bonding between the above-mentioned fibrous nonwoven fabric sheet and the biaxially stretched film, and the bonding of the film and the fiber are performed in 15
Although 0 ° C. was required, the resulting product had a flattened fiber and a portion fused to an adjacent fiber.

Next, a wax-based release agent was applied to the upper surface of the film, and the printing was evaluated.

Although the obtained heat-sensitive stencil printing base paper had good running properties, the printed matter had poor character clarity and had white spots on solid black portions. It is considered that the flattening of the fibers and the fusion of adjacent fibers by thermocompression bonding hinder the ink permeability.

Comparative Example 2 Polyethylene terephthalate copolymerized with 25 mol% of isophthalic acid having a melting point (Tm ₂ ) of 190 ° C. was used as the low melting point component in the polyester fiber, and the melting point (Tm ₃ ) 245 was used as the high melting point component. ° C
According to Example 1, a fibrous nonwoven fabric sheet was obtained using polyethylene terephthalate copolymerized with 6 mol% of isophthalic acid. On the other hand, the polyester film has a melting point (Tm
₁ ) A biaxially stretched film was obtained according to Example 1, using polyethylene terephthalate copolymerized with 18 mol% of isophthalic acid at 215 ° C.

In the thermocompression bonding of the above-mentioned fibrous nonwoven fabric sheet and the biaxially stretched film, a temperature of a hot roll of 150 ° C. was required for bonding the film and the fiber. Thermo-compression bonded products have no deformation such as flattening of fiber,
And the entangled points between the fibers formed a tightly fused net state. However, the smoothness of the film surface was poor, probably due to insufficient thermal stability of the film with respect to the temperature of the hot roll.

Further, a wax-based release agent was applied to the upper surface of the film, and printing was evaluated. The printed matter had poor character clarity and had white spots on solid black portions. Observation with a microscope of this defective printing portion revealed that the hole had not been perforated. This is considered to be due to poor smoothness of the film surface and poor contact with the thermal head during perforation.

Comparative Example 3 Polyethylene terephthalate copolymerized with 40 mol% of isophthalic acid having a melting point (Tm ₂ ) of 110 ° C. was used as the low melting point component in the polyester fiber, and the high melting point component was a melting point (Tm ₃ ) of 170. ° C
Using a polyethylene terephthalate copolymerized with 30% by mole of isophthalic acid, the spinning temperature was set to 240 ° C., and a sheet after collecting the conveyor was converted to a sheet using a hot roll at 70 ° C. Obtained.

On the other hand, the polyester film has a melting point (T
m ₁ ) A biaxially stretched film was obtained according to Example 1 using polyethylene terephthalate copolymerized with 25% by mole of isophthalic acid at 190 ° C.

In the thermocompression bonding between the above-mentioned fibrous nonwoven fabric sheet and the biaxially stretched film, a temperature of a hot roll of 90 ° C. was required for bonding the film and the fiber. In the thermocompression-bonded product, the bonding portion between the film and the fiber and the entangled point between the fibers formed a mesh state in which the film was firmly fused.

Further, a wax-based release agent was applied to the upper surface of the film, and printing evaluation was performed. The printed matter was often faint and lacked the sharpness of characters. Observation of the plate with a microscope revealed that the perforated shape was distorted. Also, the base paper was distorted in the running direction. It can be considered that the heat resistance of the heat sensitive stencil is insufficient.

Table 1 summarizes the above evaluation results.

[0071]

[Table 1]

[0072]

The heat-sensitive stencil printing paper of the present invention does not use any adhesive for laminating the polyester film and the porous support of the polyester fiber non-woven fabric. For this reason, since the transmission of the printing ink is not hindered at all by the adhesive, the printed matter obtained by stencil printing using the heat-sensitive stencil sheet of the present invention has high image quality and excellent print clarity. . Further, since the fibers constituting the support are fused to each other at their interlacing points to form a network, the strength of the support is excellent, and the balance between the holding properties and the permeability of the printing ink is excellent.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41N 1/24 102

Claims (4)

(57) [Claims] 1. A heat-sensitive stencil sheet obtained by fusing a polyester fiber nonwoven fabric composed of two components having different melting points to one surface of a polyester film, wherein the melting point Tm ₁ (° C.) of the polyester film and the low Melting point Tm ₂ (° C.) of melting point component and melting point T of high melting point component
m ₃ (° C.) is heat-sensitive stencil sheet which satisfies the following relationship, and wherein the polyester fiber nonwoven fabric formed by fusing at entangling points of the fibers. Tm ₂ ≦ Tm ₁ −30 Tm ₃ ≧ Tm ₂ +50 Tm ₃ ≧ Tm ₁ 2. The heat-sensitive material according to claim 1, wherein the composition ratio (weight ratio) of the low melting point component and the high melting point component of the polyester fiber constituting the polyester fiber nonwoven fabric is 5/95 to 70/30. Base paper for stencil printing. 3. The polyester fiber nonwoven fabric has a fineness of 0.3 to 0.3.
The heat-sensitive stencil printing paper according to claim 1 or 2, wherein the base paper is made of 10-denier polyester fiber and has a basis weight of ² to 20 g / m2. 4. A polyester film having a thickness of 0.5 to 10
The heat-sensitive stencil sheet according to claim 1, 2 or 3, which is a biaxially stretched film of μm.