KR101337838B1 - Releasing sheet for processing and production process for the same - Google Patents

Abstract

An object of the present invention is to provide a release sheet for a process which has high gloss and is repeatedly used in a manufacturing process such as synthetic leather or marking film, which has high glossiness, and a manufacturing method thereof.

A process release sheet having a release layer made of thermoplastic resin formed by extrusion coating on at least one side of the support, wherein the smoothness of both sides of the support (JAPAN TAPPI paper pulp test method, reciprocal smoothness) is 100 seconds or more, and the release layer A process release sheet having a release sheet for a process and a release layer made of thermoplastic resin formed by extrusion coating on at least one side of a support, characterized in that the glossiness (JIS Z8741, 75 degree mirror glossiness) is 80% or more. A manufacturing method, wherein the exfoliation layer formed on the support during extrusion coating is brought into close contact with a release film having a surface having a maximum surface roughness Rt (JIS B0601) of 0.250 μm or less, and cooled with a cooling roll while being in close contact. Provided is a method for producing a sheet.

Description

Releasing sheet for processing and production process for the same

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of the manufacturing method of the peeling sheet for a process of this invention.

<Description of Symbols>

1: support feed roll

2: Support

3: pressurized roll

4: T-die

5: thermoplastic resin

6: cooling roll

7: release film

8: release film feed roll

9: tension roll

10: roll for winding

11: release roll

12: tension roll

13: extruder barrel

The present invention relates to a release sheet for a process having a high gloss and repeatedly used in a manufacturing process such as synthetic leather or marking film excellent in beauty, and a method for producing the same.

Synthetic leather, marking film, and the like generally use a process release sheet having a release layer made of a releasable resin on the surface of the support, and a synthetic resin such as a urethane resin, vinyl chloride resin, or polyamide resin on the release layer of the process release sheet. After apply | coating and drying the coating liquid which consists as a main component, the base material is laminated | stacked through the adhesive agent as needed on it, and it peels and removes a process release sheet after that, and is manufactured.

The surface of such synthetic leather, marking film, or the like is coated with a shape such as gloss, matte, or pattern, depending on the application. As a specific method of performing this mold pasting, for example, when extrusion coating the molten resin for peeling layer formation to the surface used as the base sheet of the above-mentioned release sheet for a process, peeling was performed by pressing a metal cooling roll tightly. The method of performing mold pasting by the process release sheet which has a layer is employ | adopted (for example, Unexamined-Japanese-Patent No. 2627821).

However, when manufacturing the peeling sheet for a process used by this method, by the foreign material mixed in the middle of manufacture, etc., the surface of a metal cooling roll is damaged, or it is continuous by the transfer electrodeposition material from molten resin to the surface of a roll. Glossiness nonuniformity, unevenness | corrugation nonuniformity, etc. generate | occur | produce on the surface of a roll from the time of manufacture, and the problem that the quality of the manufactured peeling sheet for a process falls over time arises. In order to avoid such a problem, the cooling roll which has high mirror property is calculated | required especially for manufacture of the release sheet for the processes for manufacturing synthetic leather and marking film which have high gloss and excellent beauty, but in this case, Much time and money were spent on maintaining, repairing, checking and replacing the cooling rolls.

Under such a situation, an object of the present invention is to provide a release sheet for a process having a high gloss, which is repeatedly used in a manufacturing process of a synthetic leather or a marking film excellent in aesthetics, and at the same time can be given a high gloss, and a method for producing the same. .

MEANS TO SOLVE THE PROBLEM As a result of carrying out various research in order to achieve the said subject, the peeling sheet provided with the peeling layer which has a specific mirror glossiness which consists of thermoplastic resins by extrusion coating on at least one side of the support body which has a specific double-sided smoothness. By this, the inventors found that the above problems can be achieved. Moreover, when cooling with a cooling roll in order to form the peeling layer which consists of thermoplastic resins by extrusion coating on the support body, it discovered that the said subject can be achieved by interposing a peeling film between a peeling layer and a cooling roll. This invention is completed based on such knowledge.

That is, the present invention,

(1) A process release sheet having a release layer made of a thermoplastic resin formed by extrusion coating on at least one side thereof, the smoothness of both sides of the support (JAPAN TAPPI paper pulp test method, quench type) ) Smoothness) is 100 seconds or more, the release layer for the process, characterized in that the glossiness (JIS Z8741, 75 degree mirror surface glossiness) of the release layer is 80% or more,

(2) the release sheet for process as described in said (1) whose thermoplastic resin is a homopolymer of (alpha) -olefin or a copolymer of (alpha) -olefin and another polymerizable monomer,

(3) The release sheet for process as described in said (2) whose thermoplastic resin is polypropylene resin and / or a pentene resin,

(4) A method for producing a process release sheet having a release layer made of a thermoplastic resin formed by extrusion coating on at least one side thereof, wherein a maximum surface roughness Rt (JIS B0601) is applied to the release layer face formed on the support during extrusion coating. A method for producing a release sheet for a process, wherein the release film having a surface of 0.250 μm or less is brought into close contact with each other and cooled with a cooling roll while being in an adhered state.

(5) After cooling with the said cooling roll, the peeling film is peeled from a peeling layer and the manufacturing method of the peeling sheet for processes as described in said (4) which winds up the peeling sheet for processes,

(6) The method for producing a release sheet for a process according to the above (4) or (5), wherein the thermoplastic resin is a homopolymer of? -Olefin or a copolymer of? -Olefin and another polymerizable monomer;

(7) The manufacturing method of the peeling sheet for processes as described in said (4) or (5) whose thermoplastic resin is a polypropylene resin and / or a pentene resin,

(8) The manufacturing method of the peeling sheet for a process in any one of said (4)-(7) whose smoothness (JAPAN TAPPI paper pulp test method, a quench smoothness) of both surfaces of a support body is 100 second or more,

(9) The manufacturing method of the peeling sheet for a process as described in any one of said (4)-(8) which a peeling layer has 80% or more of glossiness (JIS Z8741, 75 degree mirror glossiness).

The support used in the process release sheet of the present invention has a smoothness on both sides (JAPAN TAPPI paper pulp test method, reciprocal smoothness) of 100 seconds or more, preferably 200 seconds or more, more preferably 250 seconds or more. The support having such a smoothness can be obtained by applying a drying solution containing a kaolin, an adhesive component, or the like to a sheet of paper, usually, and then smoothing it with a super calender.

By setting the smoothness of the surface of the support (the peeling layer forming surface) to 100 seconds or more, the thickness of the peeling layer made of the thermoplastic resin extruded and coated on the support can be made thin, and even if the thickness is made thin, the peeling layer is recessed or voids (pinhole). And gloss non-uniformity can be prevented. By reducing the thickness of the release layer, when producing a resin film such as synthetic leather, the machine titration can be maintained satisfactorily, and roll winding for transporting and storing the release sheet for processing is easy, and roll replacement of the release sheet for processing is performed. The frequency can be increased without increasing the productivity.

Moreover, when setting the smoothness of the back surface (non-peel layer non-formation surface) of a support body to 100 second or more, when storing the process peeling sheet in roll state, even if the back surface of a support body and the peeling layer are in contact with the peeling layer surface, The shape of the back surface of the support can be transferred to prevent the glossiness of the release layer from decreasing.

The basis weight of the support is about 30 to 500 g / m ² , and preferably 50 to 300 g / m ² .

By setting the range of basis weight of the support as described above, when the thermoplastic resin is extrusion coated on the support, the machine titration can be maintained well.

Next, the thermoplastic resin used in order to form a peeling layer by extrusion coating is demonstrated.

As a thermoplastic resin used by this invention, the following polyolefin resin is mentioned. Polyolefin resins include ethylene, propylene, 1-butene, 2-methyl-1-butene, 2-methyl-1-pentene, 1-hexene, 2,2-dimethyl-1-butene and 2-methyl-1-hexene , 4-methyl-1-pentene, 1-heptene, 3-methyl-1-hexene, 2,2-dimethyl-1-pentene, 3,3-dimethyl-1-pentene, 2,3-dimethyl-1-pentene Homopolymers of α-olefins such as 3-ethyl-1-pentene, 2,2,3-trimethyl-1-butene, 1-octene, 2,2,4-trimethyl-1-octene, and these α-olefins; And copolymers with other polymerizable monomers. As another polymerizable monomer, For example, Vinyl compounds, such as vinyl acetate, styrene, acrylonitrile, methacrylonitrile, a vinyl ketone; Unsaturated carboxylic acids such as acrylic acid and methacrylic acid; Unsaturated carboxylic acid esters such as methyl acrylate, ethyl acrylate, n-propyl acrylate, methyl methacrylate, ethyl methacrylate, and n-propyl methacrylate; Unsaturated carboxylic acid amide, such as acrylamide and methacrylamide, etc. are mentioned. These polymerizable monomers can be used individually or in combination of 2 or more types. In the case of a copolymer of an alpha olefin and other polymerizable monomers, a copolymer having an electron in a molar ratio of 50% or more, more preferably 75% or more is preferable. Such thermoplastic resin may be used individually by 1 type, and may be used in combination of 2 or more type.

Among them, polypropylene resin mainly containing polypropylene and / or pentene resin mainly containing 4-methyl-1-pentene are preferable from the viewpoints of peelability, heat resistance and durability in repeated use.

The thickness of the said peeling layer is about 10-200 micrometers, Preferably it is 20-100 micrometers, More preferably, it is 30-80 micrometers.

In the manufacturing method of the peeling sheet for a process of this invention, the glossiness (JIS Z8741, 75 degree mirror glossiness) of the peeling layer which consists of said thermoplastic resin needs to be 80% or more. If this glossiness is less than 80%, it will be impossible to manufacture synthetic leather, marking film, etc. which have high gloss and are excellent in beauty. Preferred glossiness is at least 90%.

Next, the manufacturing method of the release sheet for a process of this invention is demonstrated.

In the manufacturing method of the peeling sheet for a process of this invention, a peeling layer is formed in at least one surface of a support body by extrusion coating. More specifically, coextrusion molding, tandem with a single extruder or extrusion coating with a single extruder which is commonly used is common.

As a support body, it is preferable that the smoothness of both surfaces (JAPAN TAPPI paper pulp test method, a ternary smoothness) is 100 second or more.

Next, the peeling film used by this invention is demonstrated.

As for the peeling film in this invention, it is essential that maximum surface roughness Rt (JIS B0601) has the surface of 0.250 micrometer or less. Peeling in this invention if it is a film which has a film which does not contain a filler, or a layer which does not contain a filler manufactured by methods, such as a T-die system or an inflation system, and a film whose maximum surface roughness Rt is 0.250 micrometer or less Can be used as a film. The maximum surface roughness Rt of the release film is preferably 0.150 µm or less.

There is no restriction | limiting in particular as resin for peeling film, if it is flexible resin, Polyester resin, silicone resin, alkyd resin, silicone modified alkyd resin, aromatic polyimide resin, aromatic polyamide resin, aromatic polyamideimide resin, polyether Ketone resins, polysulfone resins, polyethersulfone resins, polyetherimide resins, polyphenylene sulfide resins, polyethylene phthalate resins, polyethylene naphthalate resins, polycarbonate resins, cellulose triacetate resins, fluorine resins and the like are preferably used.

Among these, it is preferable that it is a film mainly made from a polyethylene phthalate resin and a polyethylene naphthalate resin from a viewpoint of price, strength, and heat resistance. The release film may be a laminate of films made of two or more different kinds of the above resin materials, but it is preferable that the surface serving as a mirror surface with respect to the release layer, that is, the surface in contact with the release layer, is a polyethylene phthalate resin or a silicone-modified alkyd resin. . Moreover, although the multilayer film which laminated | stacked the filler containing film with the film which does not contain a filler may be used, since the surface which contacts a peeling layer needs to make the maximum surface roughness 0.250 micrometer or less, it is set as the film which does not contain a filler. It is important.

The thickness of a peeling film is about 10-200 micrometers normally, Preferably it is 10-100 micrometers, More preferably, it is 20-75 micrometers. When the thickness is 10 µm or more, the strength or mechanical aptitude at the time of lamination is secured. When the thickness is 200 µm or less, transportation and storage are easy even when wound together with the process release sheet, and the frequency of roll replacement of the process release sheet is also increased. Productivity can be kept high.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows one Embodiment of the manufacturing method of the peeling sheet for a process of this invention. Based on FIG. 1, the manufacturing method of the release sheet for a process of this invention is demonstrated.

The support 2 fed from the support feed roll 1 is transferred to the lower part of the T-die 4 by the rotation of the pressure roll 3, but the corona discharge treatment and the ozone treatment are separated from the support in the vicinity of reaching the bottom. It is preferable from a viewpoint of improving adhesiveness with a layer. The thermoplastic resin 5 for forming the release layer is dropped from the T-die 4 and sandwiched together with the support 2 by the pressing roll 3 and the cooling roll 6 and being laminated on the support 2.

On the other hand, after the peeling film 7 is thrown in from the peeling film feed roll 8, it contacts the cooling roll 6 via the tension roll 9 so that wrinkles may not arise, and is conveyed by rotation of the cooling roll 6, Then, together with the release layer and the support, it is sandwiched between the press roll 3 and the cooling roll 6 and laminated on the release layer. In addition, although the peeling sheet for a process shows the state which wound the peeling sheet for processes with the peeling film 10 with the peeling film, you may wind up after peeling and removing a peeling film. In addition, code | symbol 11 is a release roll, 12 is a tension roll, and 13 is an extruder barrel.

The glossiness (JIS Z8741, 75 degree mirror surface glossiness) of the peeling layer of the peeling sheet for processes obtained as mentioned above becomes 80% or more.

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples at all.

Example 1

4-methyl-1-pentene-based resin [Brand name: DX820, Mitsui Chemical Co., Ltd.] on the surface side of the support [Photo paper made by Mitsubishi Paper Co., Ltd., basis weight: 170 g / m ² , smoothness: surface side 510 seconds, back side 420 seconds] Ltd.) is extruded to a thickness of about 50 μm at an extrusion molding temperature of about 300 ° C. using a T-die extruder to form a release layer, and at the same time, a release film [trade name: polyester film T-700, Mitsubishi Chemical Polyester Co., Ltd. thickness, 38 micrometers, A constitution: Two-layer structure product of a filler-free polyester resin layer and a filler containing polyester resin layer, and maximum surface roughness Rt of a filler-free polyester resin surface Rt: 0.100 micrometer] The filler-free polyester resin side was laminated on the release layer and passed between the press roll and the cooling roll to produce a release sheet for the process, and wound up on the roll. In addition, the corona discharge treatment and ozone treatment were performed on the support immediately before the support and the release layer were in contact, and the release film was peeled off and removed from the release layer before winding the process release sheet. .

Example 2

The release film was made from Toray Co., Ltd. polyester film [brand name: RC06, thickness: 38 micrometers, structure: two-layer structure product of a filler-free polyester resin layer and a filler-containing polyester resin layer, and a filler-free polyester resin surface] Was performed in the same manner as in Example 1 except that the maximum surface roughness of Rt was 0.070 µm].

Example 3

To: (PH 903A trade name) a support manufactured by Mitsubishi Paper Co. The paper sheet Aroma Co., San a release layer on the (basis weight:: 100g / m ^2, smoothness of the front surface 320 seconds, the backside 300 seconds) The polypropylene based resin , Release film made by Lintec Co., Ltd. (trade name: PD386010, thickness: 38 μm, structure: three-layer structure of filler-free silicone-modified alkyd resin layer, filler-free polyester resin layer, and filler-containing polyester resin layer) Width of the silicone-modified alkyd resin surface was measured in the same manner as in Example 1 except that the filler-free silicone-modified alkyd resin surface was laminated using a silicone-modified alkyd resin surface.

In Examples 1-3, the surface of the cooling roll did not become dirty even after continuous operation, and the peeling sheet for a process of 80% or more of glossiness of a peeling layer was able to be produced continuously.

Comparative Example 1

Example except using polyester film T-100 [manufactured by Mitsubishi Polyester Co., Ltd., thickness: 38 micrometers, structure: single-layered structure only by filler containing polyester resin layer, and maximum surface roughness Rt: 0.987 micrometer] It carried out like 1 and manufactured the peeling sheet for a process.

Comparative Example 2

The release sheet for a process was produced like Example 1 except having used good quality paper (basic weight: 127.9 g / m <^2> , smoothness: surface side 38 second, back side 32 second) as a support body.

Comparative Example 3

Except for changing to a polyester film made by Mitsubishi Polyester Co., Ltd. (trade name: T-300, thickness 38 μm, structure: single-layered structure only of filler-containing polyester resin layer, maximum surface roughness Rt: 0.305 μm) It carried out similarly to Example 1, and produced the peeling sheet for a process.

In Comparative Examples 1-3, the process release sheet of 80% or more of glossiness of the release layer could not be produced.

<Test method>

The following test was done using the peeling sheet for each process obtained by the said Example and a comparative example, and the result obtained was shown in Table 1.

<Test items>

1. Smoothness of Support

In accordance with the JAPAN TAPPI paper pulp test method, lump smoothness was measured.

2. Maximum surface roughness Rt of release film

It measured according to JIS B0601.

3. Glossiness of the release layer of the release sheet for the process

According to JIS Z8741, 75 degree mirror glossiness was measured.

4. Fabrication of Synthetic Leather and Its Mirror Properties

Urethane resin solution which becomes the skin layer of synthetic leather on the peeling layer of the peeling sheet for each process [A mixture of 15 weight parts of black coloring agents, such as 100 weight part of polyurethane resin solutions "Crisbon 7367SL" made by Dainippon Ink and Chemicals, Inc. ] Was apply | coated so that the thickness after drying might be set to 30 micrometers, and it heated and dried at 100 degreeC for 2 minutes, and formed the urethane resin layer. After applying the above-mentioned Crisbon 7367SL layer, "Crisbon is an organic polyisocyanate crosslinking agent made by a company such as 100 parts by weight of a urethane resin solution [manufactured by Dainippon Ink and Chemicals Co., Ltd., polyurethane resin solution" Chrisbon 4010 " NX "10 parts by weight of the mixture] was applied so that the thickness after drying was 50 µm, immediately affixed a brushed fabric on the adhesive layer, and heated at 100 ° C. for 5 minutes, and then aged at room temperature for 3 days, followed by a release sheet for processing. Was peeled off to prepare a synthetic leather. The specular property of the outer skin layer of the obtained synthetic leather was visually observed, and the good and bad appearances were evaluated based on the following criteria.

○: The surface of the epidermal layer is flat, and there is no cloudiness or gloss unevenness in the glossiness, and it shines.

(Triangle | delta): A thing with some blurriness and glossiness nonuniformity on the surface of a skin layer.

X: The blur of the surface of the epidermal layer is remarkable.

unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Smoothness of support
(Surface Side / Back Side) second 510/420 510/420 320/300 510/420 38/32 510/420 Surface roughness Rt of the release film ㎛ 0.100 0.070 0.080 0.987 0.100 0.305 Surface glossiness of the release layer of the release sheet for the process % 95 100 98 64 72 74 Mirrorability of Synthetic Leather
(Good and bad of appearance) - ○ ○ ○ × × △

As is clear from Table 1, it turns out that the process release sheet of this invention obtained by the Example was excellent compared with that in the process release sheet obtained by the comparative example also about any characteristic.

According to this invention, it can provide the peeling sheet for processes which has high gloss, is repeatedly used in manufacturing processes, such as a synthetic leather, marking film, etc. which is excellent in aesthetics, and can give high gloss.

Claims (9)

A process release sheet having a release layer made of thermoplastic resin formed by extrusion coating on at least one side of the support, wherein the smoothness of both sides of the support (JAPAN TAPPI paper pulp test method, reciprocal smoothness) is 100 seconds or more, and the release layer Glossiness (JIS Z8741, 75 degree mirror glossiness) of more than 80%, After the release layer was brought into close contact with the release film having a surface having a maximum surface roughness Rt (JIS B0601) of 0.250 μm or less on the release layer surface formed on the support during the extrusion coating, and then cooled with a cooling roll while keeping the adhesion state, the release film It is formed by peeling from the said peeling layer, The peeling sheet for processes characterized by the above-mentioned. The method of claim 1, The process release sheet whose thermoplastic resin is a homopolymer of (alpha) -olefin, or a copolymer of (alpha) -olefin and another polymerizable monomer. 3. The method of claim 2, The release sheet for processes whose thermoplastic resin is polypropylene resin or pentene resin. A method of manufacturing a release sheet for a process having a release layer made of thermoplastic resin formed by extrusion coating on at least one side of a support having a smoothness on both sides (JAPAN TAPPI paper pulp test method, a reciprocal smoothness) of 100 seconds or more. The peeling film which has a surface whose maximum surface roughness Rt (JIS B0601) is 0.250 micrometer or less is made to adhere to the peeling layer surface formed on the support body, and it cools with a cooling roll, keeping a close state, The said peeling layer has glossiness (JIS Z8741, 75 degree mirror glossiness) 80% or more, The manufacturing method of the process peeling sheet characterized by the above-mentioned. 5. The method of claim 4, After cooling with the said cooling roll, the peeling film is peeled from a peeling layer and the manufacturing method of the peeling sheet for processes which winds up the peeling sheet for processes. The method according to claim 4 or 5, The manufacturing method of the peeling sheet for a process whose thermoplastic resin is a homopolymer of (alpha)-olefin or a copolymer of (alpha) -olefin and another polymerizable monomer. The method according to claim 4 or 5, A process for producing a release sheet for processing wherein the thermoplastic resin is a polypropylene resin or a pentene resin. delete delete

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