JPH0648059A - Manufacture of base paper for thermal stencil printing - Google Patents

Abstract

PURPOSE:To provide base paper which is excellent in uniformity and free from laminated wrinkles and a locally delaminating phenomenon concerning a method which prepares thermal stencil printing paper by sticking an extremely thin thermosensitive film and a porous base material together. CONSTITUTION:In manufacture of thermal stencil printing base paper wherein a thermosensitive layer is peeled off from a laminated film consisting of at least one thermosensitive layer and at least one reinforcing layer and the thermosensitive layer is made to adhere to a porous base material, peeling strength between the thermosensitive layer and reinforcing layer is at most 1.5g/25mm width, a free part is within four times a width of the thermosensitive layer during a distance from peeling the thermosensitive layer to sticking the base material thereto, and elongation of the thermosensitive layer is at most 0.5% during the above-mentioned section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a heat-sensitive stencil printing base paper (hereinafter referred to as a stencil printing base paper suitable for preparing a stencil master mainly by a thermal head, light irradiation (flash light, laser light) and the like.
Abbreviated as master. ), Particularly relates to a method for producing a master by laminating an ultrathin film having a thickness of a heat-sensitive film of 2 μm or less and a porous support.

[0002]

2. Description of the Related Art Conventionally, a single layer heat-sensitive film and a porous support (hereinafter abbreviated as support) have been laminated to produce a master. However, by reducing the thickness or changing the composition in order to improve the perforation sensitivity of the heat-sensitive film, the rigidity of the film is lowered, the handleability during the laminating step with the support is lowered, and the film is laminated with the support. Occasionally, problems such as wrinkles and curling occurred.

Therefore, a heat-sensitive layer and a reinforcing layer are laminated and stretched, and a porous support is attached to the exposed surface of the heat-sensitive layer, and then reinforced from a laminate of the heat-sensitive layer and the porous support. A method for peeling layers has been proposed (JP-A-60-1780).
31, JP 61-31236, JP 6
3-53097, JP-A-63-173637, JP-A-63-173694, JP-A-64-1
4092, JP-A-64-18689, etc.).

However, the above method also has some problems.

[0005]

In the above method, the heat-sensitive layer and the reinforcing layer are first in a state of being bonded at the time of laminating with the support, and then the reinforcing layer is peeled off after the support and the heat-sensitive layer are laminated. The feature is that even thin heat-sensitive films can be laminated efficiently. However, in the above method, the adhesive strength between the heat-sensitive layer and the support is higher than the peel strength between the heat-sensitive layer and the reinforcing layer, and the strength is such that the heat-sensitive layer and the reinforcing layer do not peel even in the peeling step at high speed. . If the adhesive strength between the heat-sensitive layer and the support is slightly higher than the peel strength between the heat-sensitive layer and the reinforcing layer, a local delamination phenomenon may occur, or the reinforcing layer may be overstretched or cut due to notches or the like. Occur.

[0006] Recently, there has been proposed a method of reducing the printing area due to the adhesive by reducing the adhesive area and sticking the heat-sensitive film and the support to form a master without sacrificing the printing durability. This method employs a method of curing the adhesive by irradiating energy rays such as ultraviolet rays and electron rays.
However, when an olefin resin, particularly a resin having a low degree of crystallinity, such as an ethylene-vinyl acetate copolymer having a vinyl acetate content of 10% by weight or more, is used in the reinforcing layer, hydrogen gas, which is considered to be due to a crosslinking reaction, when irradiated with energy rays. When it occurs, the reinforcing layer and the heat-sensitive layer may be peeled off, or the heat-sensitive layer may be broken if it is severe.

More importantly, the reinforcing layer cannot be reused. When the reinforcing layer is subjected to the laminating step, it may be contaminated with the adhesive or the solvent of the adhesive, or irradiated with an electron beam or ultraviolet ray for the purpose of curing the adhesive or the surface treatment agent. Resin is cross-linked or adhesive,
The reinforcing layer peeled off due to the penetration or penetration of the solvent is recovered and used as it is for packaging purposes, or it is re-pelletized and used for forming the above-mentioned multilayer film, or reworked to other products. It becomes extremely difficult to do.

[0008]

SUMMARY OF THE INVENTION The present invention comprises at least one
In the method for producing a heat-sensitive stencil sheet, the outermost heat-sensitive layer is peeled off from the laminated film composed of the two outermost heat-sensitive layers and the adjacent at least one reinforcement layer Peel strength between layer and reinforcing layer is 1.5g /
The width is 25 mm or less, the distance from the outermost layer to the heat-sensitive layer to be bonded to the support is 4 times or less the width of the heat-sensitive layer, and the elongation of the layer is 0.5 in the section. % Or less, a method for producing a heat-sensitive stencil printing base paper.

Peel strength between the heat-sensitive layer and the reinforcing layer of the present invention (J
(According to IS K-6854) needs to be 1.5 g / 25 mm width or less, preferably 0.5 to 1.0 g / 2.
It has a width of 5 mm. When the peel strength is larger than 1.5 g / 25 mm width, wrinkles are formed when the heat-sensitive layer is peeled from the multilayer film, and wrinkles are formed when the heat-sensitive layer is attached to the support. When the peel strength is particularly high (greater than 2.5 g / 25 mm width), peeling is difficult at a high speed of, for example, 100 m / min or more, and the heat sensitive layer breaks. As a method for forming a laminated film, a method of forming a film by coextrusion / costretching is preferably used. In this case, however, if the peel strength is too low, the film may be peeled off during stretching.

In order to reduce the peel strength to 1.5 g / 25 mm width or less, the crystallinity of the reinforcing layer is first measured by the wide-angle X-ray method.
Of a resin mainly composed of a polyolefin-based polymer of 55% or less is used, and the melting point of the composition is 25 ° C. or less,
And HLB (Revised 2nd edition, Oil and Fat Chemistry Handbook, p.710 ('
82, Maruzen)) is achieved by using a release agent containing 10 or more surfactants as a main component.

When the crystallinity of the polyolefin polymer exceeds 55%, the dispersibility in kneading the release agent and the bleed-out property are not good. Specific examples of preferable polyolefin-based copolymers include ethylene-based polymers (LDPE, LLDPE, VLDPE, etc.), ethylene / α-olefin copolymers, relatively low crystalline propylene-based copolymers, butene- 1-based copolymer, ethylene-
At least one kind may be selected from vinyl acetate copolymers, ethylene-unsaturated unsaturated carboxylic acids or their copolymers with alkyl esters, ionomers thereof, crystalline 1,2-polybutadiene and the like. Preferably ethylene-
It is a vinyl acetate copolymer, a copolymer of ethylene-aliphatic unsaturated carboxylic acid or alkyl esters thereof, and more preferably the latter. The composition may be a homopolymer composition of the above-mentioned polyolefin-based polymer, or other above-mentioned polyolefin-based polymer or other polyolefin-based polymer or other resin may be added in an amount of 50% by weight or less, more preferably 40% by weight, depending on the purpose. However, it may be blended in a ratio of 30% by weight or less. In many cases, blending allows stable stretching in a wide temperature range.

Specific examples of the surfactants preferably used next include polyoxyethylene (hereinafter abbreviated as POE) alkyl ester, POE alkyl ether, and PO.
E sorbitan alkyl ester, POE glycerin alkyl ester, polyglycerin alkyl ether, glycerin fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, higher fatty acid ester,
Nonionic surfactants such as N, N-bis (2-hydroxyethyl) alkylamine), phosphoric acid esters, and ammonium salts. Preferred are nonionic surfactants. More preferably, it is a blend of POE alkyl ether and the surfactant with an antistatic agent such as N, N-bis (2-hydroxyethyl) alkylamine).

The above surfactants may be used alone, or within the range not exceeding 50% by weight, the above surfactants or other surfactants, higher fatty acids, organopolysiloxanes, etc., or silica, mica, Particles such as resin particles (silicone resin etc.) may be blended. Examples of the organopolysiloxane include dimethylpolysiloxane (dimethyl silicone oil), modified silicone oil such as alkyl-modified, amino-modified, mercapto-modified, epoxy-modified, ether-modified, alcohol-modified and the like.

The amount of the release agent added to the reinforcing layer is 0.2-5.
%, Preferably 1 to 3% by weight. The thickness of the reinforcing layer is preferably 5 to 50 μm, more preferably 7 to 20.
μm. Further, the reinforcing layer is different from the reinforcing layer containing the above releasing agent for the purpose of improving the strength of the reinforcing layer, adjusting the bleeding amount or the bleeding speed of the releasing agent that bleeds out at the interface between the heat-sensitive layer and the reinforcing layer, and the like. The reinforcing layer may be laminated.

Materials used for the heat-sensitive layer of the present invention include thermoplastic resins such as polyester, polyamide,
Polyolefins (polyethylene, polypropylene, ethylene / α-olefin copolymers, propylene / α-olefin copolymers, etc.), ethylene-vinyl acetate copolymers and their oxides (ethylene / vinyl alcohol copolymers), polyvinyl chloride , Polyvinylidene chloride and copolymers thereof, and the like. Among them, a composition mainly having a crystallinity (by wide-angle X-ray method) of 30% or less in a sufficiently annealed thermoplastic resin, more preferably 20% or less, and further preferably 10%
The composition is mainly composed of the following copolyester or copolyamide. In some cases, even if the above value exceeds 30%, if the crystallinity when processed into a film is 30% or less, it can be preferably used.

Other resins may be blended with the resin within a range not exceeding 50% by weight. Furthermore, silica, titanium oxide, mica, calcium carbonate, inorganic particles such as talc,
You may add metal powders, such as copper, zinc, and aluminum, carbon, other pigments, dyes, crosslinked resin particles (silicone resin, styrene type, acrylic type, etc.), hollow particles, etc. at 5 wt% or less. Further, surface modifiers (for example, silicone resin modifiers, fluorine modifiers, etc.), antioxidants, infrared absorbers, etc. may be added.

Especially in the case of polyester, terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid,
Diphenylcarboxylic acid, sebacic acid, trimellitic acid,
At least one selected from dicarboxylic acids such as adipic acid and ester-forming derivatives thereof, alkylene glycols such as ethylene glycol and diethylene glycol and ester-forming derivatives thereof as a diol component, and cycloalkylediol such as butanediol and cyclohexanediol. , Cyclohexanedimethanol, bisphenol A, and derivatives thereof, and the like. Among them, particularly terephthalic acid (20 mol% or less may be copolymerized with isophthalic acid, adipic acid, etc.) as an acid component, and ethylene glycol (40 mol% or less as cyclohexanedimethanol, diethylene glycol, bisphenol A) as a diol component.
And the like) may be copolymerized). Further, when the composition is blended with ethylene-vinyl alcohol, propylene, a cellulosic resin or the like in an amount of 30% or less, preferably 1 to 10%, the resistance to an organic solvent such as toluene and ethyl acetate and the slipperiness are improved (as described above). It is not necessary to add particles), which is preferable. Further, as a blending effect, the peelability between the heat-sensitive layer and the reinforcing layer is improved, and stable peeling can be performed even at high speed. The thickness of the heat sensitive layer is 0.1 to 5
μm is preferable, and 0.5 to 2 μm is more preferable.

It is preferable that the heat-shrinkage layer has a heat shrinkage ratio at 100 ° C. (hereinafter, X) of 70% or less and a heat shrinkage stress at 100 ° C. (hereinafter, Y) of 100 g / mm ² or more,
More preferably, X is 1 to 65% and Y is 200 to 1500.
g / mm ² , particularly preferably X is 10 to 65% and Y is 2
It is 50 to 1200 g / mm ² . The heat-sensitive layer may be a single layer of the above composition, or may be laminated with, for example, a resin layer having good solvent resistance or a layer made of hot melt resin.

Next, the layers are arranged such that the heat-sensitive layer is M and the reinforcing layer is P.
Then, M / P, M / P / M, (M / P) _n M (however, n ≧ 2), M / P / M / P, (M / P) _n (however,
n ≧ 3) ... Of course, M and P may each be a single layer, or (M1 / M2), (P1 / P2, P1 /
P2 / P1 and P2 / P1 / P2) may be used to form a multi-layered structure.

The laminated film may be produced by extrusion lamination, coextrusion or the like, but the latter is preferable. The above composition is co-extruded from a multilayer T-die and a multilayer circular die to form a multilayer film or sheet-shaped stock, and the area stretching ratio is about 5 to 40 times by roll stretching, tenter stretching, tubular stretching, or the like. To stretch. Depending on the case, heat treatment may be performed under tension, a constant relaxation rate, free shrinkage, or post-treatments such as corona treatment and embossing.

The laminating method of the present invention is characterized in that the above laminated film is first fed out from a feeding roll, the outermost heat-sensitive layer is peeled off to form a single-layer film, and the support is laminated without a gap. . In this case, the distance from the peeling of the heat-sensitive layer to the monolayer film to the coating of the adhesive and the bonding to the support should be 4 times or less the width of the heat-sensitive film, preferably 3 times. It is preferably 2 times or less, more preferably 1 time or less. If it is longer than 4 times, the heat sensitive film will be thin, causing ear breakage,
Looseness and wrinkles are likely to occur. Preferably, the above-mentioned problems are less likely to occur when the heat-sensitive film is present in a single layer for a short time, so it is better to increase the laminating speed as much as possible. Since the laminated film of the present invention has a small peel strength, it can be peeled and laminated even at a high speed of about 200 m / min or more.

The elongation of the heat sensitive layer is 0.5% in the above section.
It is necessary to adjust it as follows. If it exceeds 0.5%, the curl in the longitudinal direction of the master tends to be higher than the practical level. It is preferably 0.2% or less. As a method of adjusting the elongation, there is a method of adjusting the take-up ratio (or draw ratio) between the peeling roll and the laminating roll, or the method of adjusting the tension based on the relationship between the load and the elongation measured in advance. For example, when adjusting with tension,
If the polyester having a tensile elastic modulus of 500 kg / mm ² and a thickness of 2 μm is a heat-sensitive layer, the elongation will be 0.2% or less if adjusted to about 2 kg / m width or less. The smaller the value, the smaller the curl of the master tends to be, but the tension is 0.2 when considering the transportability in the laminating apparatus.
~ 1.2 kg / m width, preferably 0.4-1.0 k
A g / m width is suitable.

The method for laminating the heat-sensitive layer in the above-mentioned laminated film and the support will be specifically described below with reference to the drawings. However, the present invention is not limited to the following method, peeling the outermost heat-sensitive layer from the laminated film,
In the laminating step with the porous support, the distance from peeling the outermost layer to laminating the support is 3 times the width of the laminated film.
Any method may be used as long as it is not more than double.

In the system shown in FIG. 1, a laminated film in which a reinforcing layer 2A containing a surface active agent, an antistatic agent and an anti-stick agent as a release agent is bonded to a heat sensitive layer 1A is fed from a raw roll 10 and peeled. Heat sensitive layer 1 with roll 101
A and the reinforcing layer 2A are separated, and the reinforcing layer 2A is wound up (roll 13). The heat-sensitive layer 1A separated into a single layer is 102
The adhesive is applied by the adhesive coating device, is laminated with the support 3 by the laminating roll 103, the adhesive is dried and solidified by the drying oven 104, and then wound as a product (roll 1
3). In this case, since the release layer contains a surfactant, an antistatic agent and an antistick agent, it is not necessary to apply a surface treatment agent on the film surface of the master.

In the system shown in FIG. 2, first, in the first step, a laminated film having a three-layer structure of [heat-sensitive layer 1A / reinforcing layer 2A / heat-sensitive layer 1B] is fed out from the original roll 10 and the peeling roll 101 is used.
To separate the heat-sensitive layer 1A and [reinforcing layer 2A / heat-sensitive layer 1B],
After that, the heat-sensitive layer 1A is bonded to the support 3 coated with the adhesive by the adhesive coating device 102, and is passed through the drying oven 104 to 105.
After applying the surface treatment agent with the surface treatment device of No. 1, the product is taken up as a product. The [reinforcing layer 2A / heat-sensitive layer 1B] peeled off by the peeling roll 101 is an in-process laminated film roll
To be wound up. In the second step, the laminated film wound around 14 is set on the roll 10 and similarly passed through to form a master. In this case, the reinforcing layer 2 peeled off at 101
A is wound on a roll 14 (the same roll as the roll in which the work-in-process laminated film was wound in the first operation).

In the system shown in FIG. 3, the laminated film is [heat sensitive layer 1A / reinforcing layer 2A / heat sensitive layer 1B / reinforcing layer 2B / heat sensitive layer 1].
C / reinforcing layer 2C / ...] and has a multi-layered structure.
And [reinforcing layer 2A / heat-sensitive layer 1B / reinforcing layer 2B / heat-sensitive layer 1C
/ Reinforcing layer 2C / ...], and the former (1A) is adhered to the support 3 coated with an electron beam curing type adhesive on the surface of the peeling roll without passing through a free state, Completely adhered by an electron beam irradiation device, and wound as a master product through a surface treatment agent coating device 105 and the like (roll 12). The latter is peeled off by the peeling roll 101 'into the reinforcing layer 2A and [heat-sensitive layer 1B / reinforcing layer 2B / heat-sensitive layer 1C / reinforcing layer 2C / ...].
The reinforcing layer 2A is wound up on a roll 13, and the [heat sensitive layer 1B
/ Reinforcing layer 2B / Heat-sensitive layer 1C / Reinforcing layer 2C / ...] is wound around a roll 14 and then supplied to the roll 10 again. By repeating the same operation as described above, a large number of laminated films are obtained. Can manufacture the master of.

In the system shown in FIG. 4, the laminated film used is [heat-sensitive layer / reinforcing layer] _n (where n ≧ 2) or [heat-sensitive layer / reinforcing layer] _n [heat-sensitive layer] (where n ≧ 2). With a laminated film having a layer structure, a multilayer film of [heat-sensitive layer 1A / reinforcing layer 2A / heat-sensitive layer 1B / reinforcing layer 2B / heat-sensitive layer 1C / reinforcing layer 2C / ...] is unwound from the original roll 10 and is peeled off by 101 peeling rolls. The heat-sensitive layer 1A and [reinforcing layer 2A / heat-sensitive layer 1B / reinforcing layer 2B / heat-sensitive layer 1C / reinforcing layer 2C / ...] are peeled off, and the former (1A) is coated with an adhesive using an adhesive coating device 102. It is worked and bonded to the support 3. The latter is also a peeling roll 1
At 01 ', it is peeled off from the reinforcing layer 2A [heat-sensitive layer 1B / reinforcing layer 2B / heat-sensitive layer 1C / reinforcing layer 2C / ...]. The reinforcing layer 2A is wound up on a roll 13 and [heat-sensitive layer 1B / reinforcing layer 2B
/ Heat-sensitive layer 1C / Reinforcing layer 2C / ...] is wound around a roll 14 and then supplied to the roll 10 again to repeat the same operation as described above to produce a large number of masters from a single laminated film. You can do it.

In the system shown in FIG. 5, the laminated film used is a laminated film having a layer structure of [heat sensitive layer / reinforcing layer] _n [heat sensitive layer] (where n ≧ 1). / Reinforcement layer 2A / Heat sensitive layer 1B / Reinforcement layer 2B /.../ Heat sensitive layer 1X / Reinforcement layer 2X / Heat sensitive layer 1Y / Reinforcement layer 2Y / Heat sensitive layer 1Z] 1Z, reinforcing layers 2A and 2Y, and [thermosensitive layer 1
B / reinforcing layer 2B /.../ Reinforcing layer 2X / heat-sensitive layer 1Y], and heat-sensitive layers 1A and 1 are laminated with the support 3 to form a master. The reinforcing layers 2A and 2Y are wound up as a roll 13. Further, [heat-sensitive layer 1B / reinforcing layer 2B /.../ Reinforcing layer 2X / heat-sensitive layer 1Y] is wound as a work-in-process on a roll 14, set on the roll 10 again, and subjected to a laminating operation.

The support used in the present invention is a natural fiber, a regenerated fiber, a synthetic fiber, a glassy material, a carbon-based material, which is capable of transmitting a printing ink and does not deform even under the heating condition where the heat-sensitive film is perforated. Thin paper, non-woven fabric made from inorganic fibers such as whiskers as a raw material or a mixture of these materials,
Woven cloth and the like can be mentioned. In the case of non-woven type thin paper,
Those having a basis weight of 30 to 2.5 g / m ² , preferably 20
~ 4 g / m ² . In particular, a thin paper obtained by mixing a natural fiber having an average diameter of 12 μm or less and a synthetic fiber having an average diameter of 5 μm or less is preferable, and the ratio of the former is 70 to 50.
% By weight, the latter 30 to 50% by weight. In the case of a woven type mesh, it is 500 to 15 mesh, preferably 300 to 50 mesh.

The heat-sensitive film and the support are adhered to each other by bonding or heat-bonding with an adhesive or the like under the conditions that the perforation suitability of the film and the ink permeation are not hindered. In this case, the adhesive is dissolved in a solvent and applied, or a hot melt type,
Eleon, latex type, reaction type, thermosetting type, moisture curing type, ultraviolet curing type, electron beam curing type, powder type, and other various adhesives may be used and applied to the film side or the support side or both to be laminated. .

[0031]

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

[0032]

Example 1 In the heat-sensitive layer (A), the acid component was terephthalic acid,
70 mol% of ethylene glycol as a diol component,
A substantially amorphous copolyester (Tg≈81) composed of 30 mol% of 1,4-cyclohexanedimethanol.
℃, crystallinity ≒ 0% (PET manufactured by Eastman Kodak Company
G6763 equivalent) and ethylene-vinyl alcohol copolymer (ethylene content: 44 mol%, melt index: 2 g / 10 minutes, Tg = 55 ° C.) blended with a 4 wt% dry tumbler were used, and a reinforcing layer (B ), An ethylene-methacrylic acid copolymer (EMAA: Vicat softening point = 80 ° C., melting point = 101 ° C., crystallinity≈30
%) 70% by weight, crystalline polypropylene (Vicat softening point = 125 ° C., melting point = 139 ° C., crystallinity ≈60%) 1
5% by weight of ethylene-α / olefin copolymer elastomer (density ≈ 0.88 g / cm ² , amorphous) blended with polyoxyethylene alkyl ether / N, N-bis (2-hydroxyethyl) ) An alkylamine / amino-modified silicone oil-1 / 1/1 containing 3% by weight of a release agent was used.

The heat-sensitive layer (A) and the reinforcing layer (B) were melt-extruded into a two-layer state of [A / B] using a multilayer circular die and rapidly cooled and solidified with a refrigerant to obtain a tube-shaped raw material. . This was subjected to tubular biaxial stretching in a stretching zone at an ambient temperature of 100 ° C., heat-set, and then cut open to obtain two multilayer films [A / B] having a width of 1 m. The thicknesses of the A layer and the B layer are 1.5 μm for the former and 10 μm for the latter,
The peel strength between layer A and layer B was 0.5 g / 25 mm width.

The film is lined in the manner shown in FIG.
A mixed thin paper (thickness 35 μm) of 0.1 denier polyester fiber = 60/40 (weight ratio) and the layer A were laminated using a vinyl acetate adhesive as an adhesive. Here, in FIG. 1, the distance between the peeling roll 101 and the adhesive coating device 102, the distance between the adhesive coating device 102 and the laminating roll 103, and the tension are 50 cm, respectively.
The width was 0.9 kg / m (the elongation of the heat sensitive layer was about 0.2%), and the laminating speed was 100 m / min.

The peeling of the A layer and the B layer and the lamination of the A layer and the thin paper were carried out smoothly, and the film was not broken and the wrinkles did not occur. Further, the curl property (measurement of the diameter when the master is rolled up by leaving it for 50 cm from the master product roll and leaving it in a free state: practically no problem if 20 mm or more) is at a problem-free level of 50 mm. It was.

Next, the space between the peeling roll 101 and the adhesive coating device 102 is set to 5 m, the space between the peeling roll 101 and the adhesive coating device 102, and the space between the adhesive coating device 102 and the laminating roll 1 are set.
When the distance from the adhesive film 03 was set to 50 cm, the ears of the heat-sensitive film entering the adhesive coating device were broken and the adhesive could not be applied. Therefore, when the ears of the heat-sensitive film entering the adhesive coating device were held by a cross guider (TK Pinch Expander Model PEX-11A manufactured by Toyo Kikai Co., Ltd.), the ears were not broken and laminating was not generated. The curl property was 40 mm, which was a pass level.

Next, the space between the peeling roll 101 and the adhesive coating device 102 is 50 cm, the space between the peeling roll 101 and the adhesive coating device 102, and the space between the adhesive coating device 102 and the laminating roll 1
When the distance from the sheet No. 03 was set to 5 m, a wrinkle was generated during lamination with the thin paper (laminating roll 103). When the tension of the heat-sensitive film was increased to a width of 3 kg / m (the elongation of the heat-sensitive layer was about 0.7%) as a countermeasure against wrinkles, the wrinkles disappeared, but the curling property was 5 mm, which was at a level not practical. In this case, the cross guider cannot be installed in front of the roll 103 (when the cross guider is installed at the above position because the adhesive is applied, the roll of the cross guider becomes dirty and this causes the film to run out. It becomes a cause.)

[0038]

[Example 2] For the heat-sensitive layer (C), a silicone resin powder (spherical shape, particle size 1 μm) was added to the above-mentioned copolymerized polyester.
Monodisperse) of 0.1 wt% and 25 ppm of silica having an average diameter of 6 μm were added, and the reinforcing layer (D) was replaced with the ethylene-vinyl acetate copolymer (instead of the EMAA used in Example 1). Vinyl acetate content: 15% by weight, melt index: 2 g / 10 minutes), polyoxyethylene alkyl ether / glycerin fatty acid ester = 1/1 was used as a release agent, and 2% by weight was added to the release layer. I was there.

The heat-sensitive layer (C) and the reinforcing layer (D) are melt-extruded into a three-layer state (C / D / C) using a multilayer circular die, and are rapidly cooled and solidified by a refrigerant to form a tube-shaped raw material. Obtained. This was subjected to tubular biaxial stretching in a stretching zone at an ambient temperature of 100 ° C., heat set and then cut open to obtain two multi-layer films [C / D / C] having a width of 1 m. C
The thickness of layer D and layer D is 1.8 μm for the former and 10 μm for the latter.
And the peel strength between layer C and D is 0.7 g / 25 mm
It was wide.

The film was laminated by the method shown in FIG. 2 on one side of the mixed paper and the layer C using a vinyl acetate adhesive as an adhesive. Here in FIG.
The distance between the peeling roll 101 and the laminating roll 103 is 50 cm, and the take-up ratio is 1.002 (elongation of the heat-sensitive layer is 0.2
%) And the laminating speed was 150 m / min. The peeling of the C layer and the D layer and the laminating of the C layer and the thin paper were performed smoothly, and no film breakage, wrinkles, and the like occurred.
Further, the rolled in-process laminated film roll 10
It was set smoothly, and when it was subjected to the laminating process again, it was performed smoothly. The curl of the resulting master was 45 mm, which was a pass level.

Next, the same procedure as described above was carried out except that only 2% by weight of the glycerin fatty acid ester was used as the release agent.
The peel strength was as large as 2.0 g / 25 mm width, and the peeling of the C layer and the D layer could not be done well, and it was manageable to peel at a line speed of about 10 m / min, but when laminated with a thin paper, wrinkle was generated.

[0042]

EFFECTS OF THE INVENTION According to the present invention, the handling property during the laminating step is improved, and the problems such as wrinkles, curling, and local delamination phenomenon when laminated with a support are solved. . In addition, since the reinforcing layer is not used in the laminating process, the reinforcing layer resin is irradiated with an electron beam or ultraviolet ray for the purpose of contamination or curing of the adhesive or the surface treatment agent by the adhesive or the solvent of the adhesive. With no deterioration or the like, the peeled layer can be used as it is for packaging or the like, or can be re-pelletized for film formation of the above-mentioned multilayer film, or for other products.

[Brief description of drawings]

FIG. 1 is a schematic view showing a manufacturing process of a heat-sensitive stencil printing base paper of the present invention.

FIG. 2 is a schematic view showing another manufacturing process of the heat-sensitive stencil printing base paper of the present invention.

FIG. 3 is a schematic view showing another manufacturing process of the base paper for heat-sensitive stencil printing of the present invention.

FIG. 4 is a schematic view showing another manufacturing process of the base paper for heat-sensitive stencil printing of the present invention.

FIG. 5 is a schematic view showing another manufacturing process of the base paper for heat-sensitive stencil printing of the present invention.

[Explanation of symbols]

 1A, 1B, 1C Heat-sensitive layer 2A, 2B, 2C Reinforcing layer 10 Laminated film original roll 11 Support roll 12 Master product roll 13 Reinforcing layer winding roll 14 Work-in-progress laminated film roll 101, 101 'Release roll 102 Adhesive coating Processing device 103 Laminating rolls 104, 104 'Drying furnace 105 Surface treatment agent coating device 106 Electron beam irradiation device

Claims (1)

[Claims] 1. A heat-sensitive stencil printing method in which the outermost heat-sensitive layer is peeled off from a laminated film composed of at least one outermost heat-sensitive layer and at least one adjacent reinforcing layer, and the laminate is bonded to a porous support. In the method for producing a base paper, the peel strength between the heat-sensitive layer and the reinforcing layer is 1.5 g / 25 mm width or less, and the distance from the outermost layer peeled to one heat-sensitive layer to attach the support is the heat-sensitive layer. A method for producing a heat-sensitive stencil sheet having a layer width of 4 times or less and an elongation of 0.5% or less in the section.