JPH081684A - Sheet or regenerating mold - Google Patents

Abstract

PURPOSE:To simply and easily cut a sheet for regenerating a mold at the time of the use of the sheet in molds of several kinds different in dimension by providing marks for cutting the sheet into an appropriate dimension to the surface of the sheet composed of an unvulcanized rubber raw sheet being a matrix at predetermined intervals. CONSTITUTION:A sheet 10 for regenerating a mold is composed of an unvulcanized rubber raw sheet being a matrix and has three kinds of purposes, that is, a purpose for washing the surface of a mold, a purpose for washing the periphery of the cavity of the mold and a purpose for applying a release agent to the surface of the mold after washing in order to easily release the molded product molded for the first time after the washing of the surface of the mold. In all of these purposes, marks 11 for cutting the sheet 10 into an appropriate dimension are provided to the sheet. The marks 11 are formed by cutting and the depth thereof is set to about 2/3 the thickness of the sheet 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold reclaiming sheet used for cleaning and remanufacturing a mold such as a mold for a thermosetting resin molding material which is contaminated by repeated molding operations. is there.

[0002]

2. Description of the Related Art At the time of molding a thermosetting resin molding material, a mold release agent contained in the thermosetting resin molding material exudes to the surface of a mold to exert a mold releasing action. When such molding is repeated, the mold releasability of the molded product is remarkably deteriorated, the surface of the molded product is roughened, and the surface of the molded product is not glossy. It is considered that this is because the release agent is sequentially laminated on the surface of the mold by repeated molding, and gradually deteriorates due to oxidation to form a hard oxidation-deteriorated layer of the release agent. For example, as shown in FIG. 8, a molten epoxy resin molding material 6 is press-molded through a runner 5 by a pressing force of a plunger 4 into a cavity 3 formed by an upper mold 1 and a lower mold 2 for transfer molding. Then, as shown in FIG. 9, the mold is opened and the molded product 7 is taken out. When such a molding operation is repeated, the oxidation-deteriorated layer 7a of the release agent is formed in the cavity 3. Further, flash 8a also remains around the cavities of the mold seam 8 and the like. 9 is an air vent part. Once such an oxidation-deteriorated layer 7a of the mold release agent is formed on the cavity surface (mold surface), the mold release agent exudes from the molding material when molding the thermosetting resin molding material thereafter. However, it acts not on the mold surface but on the oxidation-deteriorated layer 7a of the above-mentioned release agent, and it becomes impossible to exert a sufficient release effect. In order to solve such a problem, conventionally, a thermosetting melamine resin molding material is put in the mold at the stage where the release agent oxidative deterioration layer 7a is formed (stage after 700 to 1000 shots). By molding and curing, the mold release agent oxidation deterioration layer 7a on the surface of the mold is integrated with the molding product 7, and the molding product 7 with the oxidation deterioration layer 7a integrated is taken out from the mold, It is done to wash. In this case, formalin is produced as a by-product as a condensate of the thermosetting melamine resin molding material to generate an odor and the like, which deteriorates the working environment and causes a decrease in cleaning workability. Further, the removal of the flash 8a adhering around the molding part such as the cavity is performed by rubbing around the mold molding part with a spatula or a brush every 50 to 100 shots to remove adhered contaminants such as flash. It is done by blowing off the air. However, it is complicated to clean the area around such a die molding portion with a spatula or a brush.

[0003]

DISCLOSURE OF THE INVENTION The present inventors have used unvulcanized rubber fabric as a base material for the purpose of removing the oxidative deterioration layer of the release agent on the mold surface as described above, and added glycol ethers thereto. A sheet-shaped mold detergent composition (hereinafter abbreviated as “sheet-shaped composition”) containing the same has been developed and a patent application has already been filed (Japanese Patent Application No. 61-252536). The mold cleaning with this sheet composition is performed as follows. That is, the sheet-shaped composition is sandwiched between upper and lower molds, and the sheet-shaped composition is brought into pressure contact with the surface of the mold by pressure during molding,
In that state, the sheet-shaped composition is heated and vulcanized by using heat during molding to convert the entire sheet-shaped composition into a vulcanized rubber, and a releasing agent on the surface of the mold during the vulcanization. The oxidation-deteriorated layer is integrated with the vulcanized rubber, the mold is opened, and the vulcanized rubber-made sheet-shaped composition having high strength and elasticity is peeled from the mold to obtain the above-mentioned sheet-shaped composition. This is performed by peeling the oxidative deterioration layer integrated with the object from the mold surface. The use of such a sheet-like composition does not cause the problems as in the case of using the thermosetting melamine resin molding material as described above. Then, the mold surface is also cleaned to the initial mirror-like state as in the case of cleaning using the melamine resin molding material. However, in general, the size of a mold in a transfer molding machine or the like varies depending on the manufacturer, and therefore, the sheet-shaped composition is set to the size of the largest one of them, and each mold is used in use. According to the above, cutting is carried out in a predetermined amount. However, it is inaccurate to carry out cutting in this manner, and in some cases, it is inconvenient that it cannot be used by cutting smaller than the size of the mold. In addition, there is a problem that fatigue is great because the nerve is used for cutting.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a die reclaiming sheet which can be accurately and easily cut.

[0005]

In order to achieve the above-mentioned object, the mold regenerating sheet of the present invention uses an unvulcanized rubber material as a base material, and cuts the sheet into appropriate dimensions on the sheet surface. The structure is such that the marks are provided at predetermined intervals.

That is, as described above, as a result of providing the mark on the sheet, it is possible to cut the sheet using the mark as a guide, and therefore, the sheet is cut more accurately than when cutting the sheet in the conventional amount. It is possible and easy to cut.

The mold reclaim sheet of the present invention uses an unvulcanized rubber fabric as a base material, and is intended to clean the mold surface (cavity surface) as described above. , Those for the purpose of cleaning around the cavity of the mold (around the molding part) and the mold after cleaning to facilitate the release of the molded product that is molded for the first time after cleaning the surface of the mold (cavity surface) There are three types, one for the purpose of applying a release agent to the surface. As shown in FIG. 1, for example, as shown in FIG. 1, all of these three types of mold reclaim sheets are provided with marks 11 at predetermined intervals for cutting the sheet 10 into appropriate dimensions. In FIG. 1, the mark 11 is formed by a cut, and the depth of the mark 11 is the sheet 10.
Is set to about 2/3 of the thickness. The sheet 10 can be cut to an appropriate size by utilizing the cut. The state of formation of this notch is shown in FIG. Instead of making a cut to about 2/3 as described above, a cut may be made to about half the thickness as shown in FIG.

The formation of such a cut is shown in FIG.
As shown in FIG. 5, a ribbon slitter having disc-shaped cutting blades 13 may be used on the rotary shaft 12 at predetermined intervals, or, as shown in FIG. Alternatively, an embossing cutter having a cutting edge 14 may be used. Further, a mark may be provided by printing instead of making the cut as described above. In this case, cutting is performed along the mark using a knife or the like. In addition, after printing, a cut may be made on the print. Further, the state of the mark is not limited to the grid pattern as shown in FIG. 1, and the parallel lines may be put in only one direction, or the mark may be put only in the peripheral portion of the sheet at regular intervals. May be. When the above-mentioned marks are formed at regular intervals, the marks also serve as a measure.

Next, the mold reclaim sheet used for cleaning the mold surface (cavity surface) will be described.

There are two types of mold reclaim sheets of this type.
The first one uses, as a base material, an unvulcanized rubber material made of a mixture of glycol ethers represented by the general formula (1) and unvulcanized rubber.

[0011]

Embedded image

The glycol ethers represented by the above general formula (1) include ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol. Monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol diethyl ether, diethylene glycol propyl ether, diethylene glycol dibutyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol It is possible to increase the glycol monomethyl ether and the like.

The glycol ether represented by the above general formula (1)
Among the ethers, n = 1 to 2, R ₁, R₂One of
When is hydrogen, the other is an alkyl group having 1 to 4 carbon atoms.
And also R₁, R₂When both are alkyl groups,
An alkyl group having 1 to 4 carbon atoms is preferable.
When n is 3 or more, the phase with rubber is
This will cause a decrease in solubility, and will also cause alkyl-based charcoal.
When the prime number is 5 or more, the release agent is added to the oxidation-deteriorated layer.
There is a tendency for poor permeability.

The above glycol ethers may be used as they are, or in water, methanol, ethanol, n-.
You may use it, mixing with alcohols, such as propanol, and organic solvents, such as toluene and xylene. When mixed with an organic solvent, the amount of the organic solvent is usually 50 parts or less with respect to 100 parts by weight of glycol ethers (hereinafter abbreviated as “part”), and most commonly 20 parts by weight or less.
It is done below the department. Further, a conventionally used release agent may be used in an appropriate amount, if necessary. When a release agent is used in combination, the amount of the release agent used is 10 parts or less per 100 parts of the total amount of the unvulcanized rubber material and the glycol ether, and most commonly 2 parts is used.
~ 5 copies are made.

As unvulcanized rubber, natural rubber (NR),
Chloroprene rubber (CR), butadiene rubber (BR),
Nitrile rubber (NBR), ethylene propylene terpolymer rubber (EPT), ethylene propylene rubber (EP
M), styrene-butadiene rubber (SBR), polyisoprene rubber (IR), butyl rubber (IIR), silicone rubber (Q), fluororubber (FKM), etc., as a main component or a mixture thereof, and further containing a vulcanizing agent. If necessary, a vulcanization accelerator, a reinforcing agent, etc. may be used. This unvulcanized rubber is vulcanized into a vulcanized rubber in the mold. The above-mentioned unvulcanized rubber is preferably EPT, SBR, NBR or a mixture thereof. The EPT is a cyclic or acyclic copolymer having ethylene, α-olefin and a non-conjugated double bond. To elaborate on this, EPT is a terpolymer consisting of ethylene, alpha-olefins (especially propylene) and the polyene monomers listed below,
Examples of the polyene monomer include dicyclopentadiene, 1,5-cyclooctadiene, 1,1-cyclooctadiene, 1,6-cyclododecadiene, 1,7-cyclododecadiene, 1,5,9-cyclododeca. Trien,
1,4-cycloheptadiene, 1,4-cyclohexadiene, norbornadiene, methylenenorbornene, 2-
Methylpentadiene-1,4,1,5-hexadiene,
1,6-heptadiene, methyl-tetrahydroindene, 1,4-hexadiene and the like. The copolymerization ratio of each monomer is preferably a terpolymer such that ethylene is 30 to 80 mol%, polyene is 0.1 to 20 mol%, and the rest is α-olefin. More preferably, ethylene is 30 to 60 mol%. The Mooney viscosity ML _{1 + 4} (100 ° C.) is preferably 20 to 70. Specific examples of the EPT include Mitsui EPTs 4021, 4045, and 4070 manufactured by Mitsui Petrochemical Co., Ltd. The SBR has a styrene content of 15 to 30 mol% and a Mooney viscosity ML _{1 + 4} (100
C.) of 20 to 80, preferably 35 to 60 are suitable. As a specific example, JSR-15 manufactured by Japan Synthetic Rubber Co., Ltd.
02, 1507 and 1778 can be listed.
The NBR has an acrylonitrile content of 20 to 60 mol%, preferably 25 to 45 mol%, and a Mooney viscosity ML.
_{1 + 4} (100 ° C) is 20 to 85, preferably 30 to 70
It is preferable to use the one described above. As a specific example, N-234L, 230S, 230SH manufactured by Japan Synthetic Rubber Co., Ltd.
Can be raised.

The glycol ethers are mixed with the unvulcanized rubber to form an unvulcanized rubber material. In this case, the glycol ether is usually blended in an amount of 10 to 60 parts with respect to 100 parts of the unvulcanized rubber. About 15 to 25 parts is preferable. The boiling point of the glycol ethers is preferably about 130 to 250 ° C. That is, the mold molding is usually performed at 150 to 185 ° C., and the boiling point of the glycol ether is 1
If the temperature is lower than 30 ° C, the evaporation during cleaning is significant, and therefore the cleaning work environment may be deteriorated. On the contrary, if the temperature is higher than 250 ° C, the evaporation becomes difficult and remains in the vulcanized rubber. Since the strength of the vulcanized rubber when it is taken out of the mold becomes weak and it deforms, it becomes difficult to sufficiently remove the oxidation-deteriorated layer of the release agent from the mold surface, and the cleaning workability deteriorates. This is because there is a tendency to let it happen.

In the mold reclaiming sheet using the unvulcanized rubber material as a base material, the unvulcanized rubber is added to the inorganic material such as silica, alumina, calcium carbonate, aluminum hydroxide, titanium oxide as a reinforcing agent. It is also possible to add a reinforcing agent (filler). In this case, the amount of the reinforcing agent used is preferably set to 10 to 50 parts with respect to 100 parts of unvulcanized rubber. Further, as described above, it is possible to add a release agent. Examples of the releasing agent include stearic acid, zinc stearate, carnauba wax, montan wax, stearyl ethylenediamide and the like.
It is possible to add 1 to 10 parts of these to 100 parts of unvulcanized rubber.

Another of the two types of mold reclaim sheets for cleaning the mold surface described above uses one or both of imidazoles and imidazolines instead of the above glycol ethers. Other than that, it is exactly the same as the above mold reclaim sheet.

As the imidazoles, it is possible to obtain good results by using the imidazoles represented by the following general formula (2). Typical examples of such imidazoles include 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 1-benzyl-2-methylimidazole, and 2,4-diamino-6 [2. '-Methylimidazolyl (1)'] ethyl-s
-Triazine, 2,4-diamino-6 [2'-ethyl-
4'-methylimidazolyl- (1) '] ethyl-s-triazine and the like.

[0020]

Embedded image

As the imidazolines, it is possible to obtain good results by using the imidazolines represented by the following general formula (3). Typical examples of such imidazolines include 2-methylimidazoline and 2-methyl-4.
-Ethylimidazoline, 2-phenylimidazoline, 1
-Benzyl-2-methylimidazoline, 2-phenyl-
4-methyl-5-hydroxymethyl imidazoline, 2,
4-diamino-6 [2'methylimidazolyl-
(1) ′] Ethyl-s-triazine, 2,4-diamino-6 [2′-methyl-4′-ethylimidazolyl-
(1) ′] Ethyl-s-triazine, 1-cyanoethyl-2-methylimidazoline, 1-cyanoethyl-2-methyl-4-ethylimidazoline and the like.

[0022]

Embedded image

Next, a specific example of the above-described two types of mold reclaiming sheet for cleaning the mold surface, in which glycol ethers are contained in the unvulcanized rubber material, will be described.

[Specific Example A] After the rubbers shown in Tables 1 and 2 below and the raw materials shown in the same table were kneaded with a kneading roll,
A sheet having a thickness of 7 mm was formed using a rolling roll, and a cut having a width of 10 mm and a depth of 5 mm was formed on the surface of the sheet in parallel with the width direction of the sheet.

[0025]

[Table 1]

[0026]

[Table 2]

Using the die reclaim sheet obtained as described above, the sheet is cut from the cut portion to have an appropriate dimension so as to fit several types of transfer molding machines having different die dimensions, and the sheet is reshaped as shown in FIG. It was used for cleaning the mold surfaces of the mold 1 and the lower mold 2. 10 is a sheet for remanufacturing the mold in a compressed state, 4
Is a plunger. The results are shown in Tables 1 and 2 above.
As shown in, the example product was extremely good as compared with the comparative example product.

SPECIFIC EXAMPLE B Next, a specific example of the above two types of mold reclaiming sheet for cleaning the mold surface, in which imidazoles are contained in the unvulcanized rubber material is shown. That is, the raw materials shown in Tables 3 to 5 described below were mixed in the proportions shown in the same table, kneaded with a kneading roll, and then formed into a sheet having a thickness of 7 mm using a rolling roll, and printing was performed to form cross-cut marks of 10 mm square. did.

[0029]

[Table 3]

[0030]

[Table 4]

[0031]

[Table 5]

Using the sheet for mold remanufacturing obtained as described above, the sheet is cut into a proper size by cutting with a knife in accordance with the printing marks of the above-mentioned base mesh so as to fit several types of transfer molding machines having different mold dimensions. It was used for cleaning the mold surface. The results are as shown in Tables 3 to 5 above, and the specific example product was extremely good as compared with the comparative example product.

Next, the mold reclaim sheet used for cleaning around the mold molding portion will be described.

This type of mold reclaim sheet is used more frequently than the above-mentioned mold surface cleaning mold reclaim sheet, in which an unvulcanized rubber base material is used as a sheet fiber base material. Is formed on one or both of the front surface and the back surface of the mold in a layered form, and has an extremely thin thickness of about 0.2 to 1.0 mm as compared with a mold for cleaning the mold surface (cavity surface). To be

As the sheet-like fiber base material used for the sheet for remanufacturing the mold, nonwoven fabrics of various materials, for example, organic fiber nonwoven fabric such as polyester nonwoven fabric, inorganic fiber nonwoven fabric such as glass paper and glass fiber nonwoven fabric, cellulose mixed glass Examples include paper and paper materials. In some cases, a woven fabric or the like may be used instead of the above non-woven fabric. As an example of the non-woven fabric, a non-woven fabric made of polyester fiber is manufactured by Asahi Kasei Co., Ltd.
E1050 and E1100 are mentioned, and as a soft cloth made of rayon fiber, Itochu Corporation D-30
38, D-3042. In addition, as a glass cloth made of glass fiber, WK-30 manufactured by Unitika Ltd.
25A-104, WL-110B-28, KC-080
8B-104-AB1.

The unvulcanized rubber material base material formed in layers on one or both of the front and back surfaces of the sheet-like fiber base material is used as the base material for the upper mold 1 and the lower mold 2 during the cleaning operation shown in FIG. The vulcanized rubber is heated and vulcanized around the dies such as the eyes, and at this time, contaminants such as burrs attached around the molding parts such as the die-matching part are integrated to form the reclaim sheet 10. When peeling and removing from the mold, contaminants such as burrs are peeled and removed from around the molding portion. As such unvulcanized rubber, the same rubber as that used for the mold reclaim sheet for cleaning the mold surface is used, and EPT, which is the same as the mold reclaim sheet, is particularly suitable. And, it is the same as the above-mentioned mold reclaiming sheet to mix silica or the like as a reinforcing agent to such unvulcanized rubber.

This mold forming part cleaning sheet is prepared by blending unvulcanized rubber with a reinforcing agent, etc., if necessary, and kneading with a kneading roll to form a thin sheet, and then laminating the sheet-like fiber base material. It can be produced by applying it to a calender roll for pressure integration.

Next, a specific example of the mold reclaim sheet used for cleaning the periphery of the mold molding portion will be described.

[Specific Example C] The raw materials shown in Tables 6 and 7 below are mixed and kneaded with a kneading roll, and then unvulcanized rubber and a non-woven fabric are calendered to a thickness of 0.5 mm.
The sheet was formed into a sheet shape, and a 10-mm square cross-shaped mark was formed by printing.

[0040]

[Table 6]

[0041]

[Table 7]

The mold reclaiming sheet obtained as described above was cut into a proper size by cutting with a knife from a printing mark so as to be suitable for a transfer molding machine having several mold sizes. Then, using this, cleaning around the mold forming part was performed. The results are shown in Tables 6 and 7 above, and it can be seen that the specific example products have excellent performance.

Next, the mold surface washed with the mold reclaiming sheet for cleaning the mold surface (when there is no mold release at all and molding is carried out as it is, the molded product adheres to the mold surface and is not released). The mold regenerating sheet for the purpose of applying a release agent to That is, this type of mold reclaim sheet contains a release agent instead of the glycol ethers and imidazoles of the mold reclaim sheet for the purpose of cleaning the mold surface.

As this type of release agent, stearic acid,
Long-chain fatty acids such as behenic acid, metal salts of long-chain fatty acids represented by zinc stearate and calcium stearate, carnauba wax, montan wax, ester wax represented by partially saponified ester of montanic acid, stearylethylenediamide Examples of the long-chain fatty acid amide, paraffins represented by polyethylene wax, and the like.

The sheet for remanufacturing the mold can be obtained by mixing the releasing agent and the unvulcanized rubber by a known method, for example, using a calender roll or the like, and the unvulcanized rubber is previously prepared. It can also be obtained by making a dough and kneading a release agent therein. In these cases, the release agent is usually added in an amount of 1 to 50 parts per 100 parts of the unvulcanized rubber material. Preferred is 3 to 20 parts. The melting point of the releasing agent is 200.
It is preferably one having a boiling point of 200 ° C or higher and a boiling point of 200 ° C or lower. Furthermore, what has a melting point of 50-150 degreeC is preferable. That is, the mold molding is usually 150 to 200.
If the melting point of the release agent is higher than 200 ° C., it does not exude to the mold surface and the boiling point is 200 ° C.
This is because if the temperature is lower than 0 ° C, even if it exudes into the mold, it tends to lose its function because it evaporates.

It should be noted that the unvulcanized rubber material in the mold reclaim sheet should be blended with other additives such as silica in the same manner as in the mold surface cleaning mold reclaim sheet. Is possible.

Next, a specific example of this mold reclaiming sheet will be described.

[Specific Example D] The raw materials shown in Tables 8 and 9 below were blended and formed into a sheet having a thickness of 7 mm by using a rolling roll, and a width of 10 mm and a depth of 5 mm parallel to the width direction of the sheet. The incisions were formed in a streak shape to obtain a sheet for regenerating a mold.

[0049]

[Table 8]

[0050]

[Table 9]

The release sheet obtained as described above is folded into appropriate dimensions by folding it from the above marks so as to fit the dies of several kinds of transfer molding machines having different die sizes, and the surface of the die is cleaned using this. The molded vulcanized rubber was taken out by sandwiching it between the thermosetting resin molding dies after completion of step 1 above, vulcanizing at 175 ° C. for 4 minutes, opening the mold immediately after vulcanization. afterwards,
A thermosetting resin molding material epoxy resin molding material (MP-10, manufactured by Nitto Denko Corp.) is molded by a usual molding method using the mold to which the release agent is applied as described above to obtain a molded product. The release state was examined. The results are shown in Tables 8 and 9 above in comparison with the results of the comparative example (one dummy shot).

As is clear from Tables 8 and 9, it can be seen that, according to the specific examples, extremely good releasability can be imparted.

[0053]

EFFECTS OF THE INVENTION The mold reclaiming sheet of the present invention is used for several kinds of molds having different mold sizes because the sheet surface is provided with marks for cutting the sheet into appropriate sizes at predetermined intervals. At this time, it is possible to easily and accurately cut from the mark. Therefore, the cleaning of the mold and the work of applying the release agent can be speeded up.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a cut portion of the present invention.

FIG. 3 is an explanatory diagram of a modified example of a cut portion.

FIG. 4 is an explanatory diagram of formation of the cut.

FIG. 5 is an explanatory diagram of formation of the cut.

FIG. 6 is an explanatory view of a usage state of an embodiment of the present invention.

FIG. 7 is a diagram illustrating a usage state of another embodiment.

FIG. 8 is an explanatory diagram of a conventional example.

FIG. 9 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 10 sheet 11 mark

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location C08K 5/3445 KDM C08L 21/00 LAY (72) Inventor Masayuki Sakamoto Oita Yoshida, Mitagawa Town, Saga Prefecture No. 2307 2 Inside Kyushu Nitto Denko Corporation

Claims (6)

[Claims] 1. A sheet for remanufacturing a mold, comprising an unvulcanized rubber material as a base material, and marks provided on the sheet surface for cutting the sheet into appropriate dimensions at predetermined intervals. 2. The mold regenerating sheet according to claim 1, wherein the unvulcanized rubber material contains glycol ethers. 3. The mold reclaiming sheet according to claim 1, wherein the unvulcanized rubber material contains at least one of imidazole and imidazolines. 4. The mold reclaim sheet according to claim 1, wherein the unvulcanized rubber material contains a release agent. 5. The mold reclaiming sheet according to claim 1, wherein the unvulcanized rubber base material is provided on at least one of the front surface and the back surface of the sheet-shaped fiber base material. 6. The mark is formed so that a cut can be made and cutting can be performed from the mark portion.
The mold reclaim sheet according to any one of 5 above.