KR102079735B1 - Method of manufacturing fire door - Google Patents

Abstract

The present invention relates to a method for manufacturing a fire door and, more specifically, to a method for manufacturing a fire door which can facilitate manufacture of panels respectively arranged on the front and rear surfaces of a stiffener and more strongly combine the panels respectively arranged on the front and rear surfaces of the stiffener. The method comprises: a cutting step of cutting an inner board into a plurality of panels; a bending step of bending one side of the plurality of panels by a roller molding machine to form a fit-coupling portion and bending the other side of the panels to form a fit-mating portion; an installation step of arranging a fire retardant on one of the plurality of panels; a coupling step of fitting and fixing the fit-coupling portion and the fit-mating portion in a state in which one surface of one of the plurality of panels faces one surface of another; and a bonding step of bonding, by a seaming machine, one of the plurality of panels to another.

Description

Fire door door manufacturing method {METHOD OF MANUFACTURING FIRE DOOR}

The present invention relates to a method of manufacturing a fire door, and more particularly, a method of manufacturing a fire door, which can more easily manufacture panels disposed on each of the front and rear surfaces of the reinforcement, and more firmly combine the panels disposed on the front and rear surfaces of the reinforcement. It is about.

Fire doors are doors that are installed in openings to prevent fire spreading and burning.In case of installation in building-oriented openings, combustion is mainly prevented from expansion when installed in openings in fire compartments such as internal firewalls. The purpose is.

In general, the fire door is completed through the side finish after installing the reinforcement inside the iron plate of the front plate and the back plate.

Reinforcing materials used in known fire doors include honeycomb, rock wool, etc. made of paper or aluminum.

The prior art Patent Publication No. 10-1995-0001057 (hereinafter referred to as the prior art) relates to a method of manufacturing a fire door to form a double-sided joint reinforcement, in more detail, a predetermined size of the interior plate 11 and the exterior plate ( In the manufacturing of the fire door 10 by overlapping the inner and outer sides 12 with an edge 13 and manufacturing the fire door 10, the reinforcing bar 20 is formed in any form between the inner plate 11 and the outer plate 12. The reinforcing table 20 is constructed by disposing and using a band-shaped steel sheet having the same width as the inner width Da of the inner and outer plates 11 and 12 in the width direction, and each reinforcing member is placed at several places. Small triangular projections 21 are symmetrically formed on the upper and lower ends of the upper and lower ends, and are formed by spreading them out from the plane to the outside. The triangular projections 21 have the same width as the inner width Da on the inner surface of the inner and outer plates 11 and 12. Was deposited in the next step. Characterized in that the bond produced by the rim 13 of the outer plate 11 (12).

This prior art uses a reinforcing agent to erect the strip-shaped steel plate in the width direction, to form a triangular projection that is heat-sealed by spot welding between the interior and exterior plates over a number of upper and lower ends, the triangular projection is located by spot welding The upper and lower ends of the inner plate and the outer plate were heated under pressure to bond them on both sides, thereby producing a high-quality fire door of high strength.

However, this prior art has a problem in that the ease of manufacture of panels disposed on each of the front and rear surfaces of the reinforcement does not include a configuration that more firmly combines the panels disposed on each of the front and rear surfaces of the reinforcement.

The present invention has been made to solve the above problems, it is an object of the present invention to provide a method for manufacturing a fire door that can be molded quickly to a large number of panels to improve the manufacturability.

In addition, an object of the present invention is to provide a method of manufacturing a fire door that can more firmly combine the panel.

It is another object of the present invention to provide a method of manufacturing a fire door, which does not burn well, endures well at high temperatures, is light, does not heat well, absorbs sound well and is not easily deteriorated.

The present invention for the purpose of solving the above problems has the following configuration and features.

The present invention is a cutting step of cutting a metal plate to produce a plurality of panels, one side of the plurality of panels by the roller molding machine is bent into a fitting portion, the other side of the panel is bent into a fitting portion bending Step, the installation step of arranging the fire retardant on any one surface of the plurality of panels, the one of the one of the plurality of panels and the other one surface of the other facing the fitting portion and the fitting corresponding part to fit And a bonding step in which any one of the plurality of panels and the other one are joined by a bonding step and a seaming machine.

In addition, the fitting counterpart may be bent inward from the other side of the panel, and the fitting coupling part may be bent vertically at one side of the panel, but may be bent in one direction such that an end is fitted to the fitting counterpart.

In addition, the fire retardant may include mineral fiber, and the mineral fiber may include at least one of glass fiber and glass wool.

The present invention having the above-described configuration and features has the effect of improving the manufacturability since it is possible to mold a large number of panels quickly by including a roller molding machine.

In addition, the present invention has the effect that the fitting between the fitting portion and the fitting counterpart is fixed, the coupling between the panels can be made more robust.

In addition, the present invention includes the fire retardant including the mineral fiber, it has the effect of not only burning well, but also at high temperatures, light and heat-resistant, absorbs sound well and does not easily deteriorate.

1 is a schematic flowchart of a fire door manufacturing method according to an embodiment of the present invention.
2 is a view for explaining a bending step.
3 is a view illustrating a panel including a fitting portion and a fitting counterpart.
4 is a view for explaining a process of applying the adhesive to the panel.
5 is a view for explaining a fire retardant.
6 is a view for explaining a state in which any one of the plurality of panels after the bonding step and the other is coupled.
7 is a diagram for explaining a seaming machine.
8 is a diagram for explaining a protective film.

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments (suns, aspects, and embodiments) (or embodiments) only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms “comprises” or “consists” are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In the present specification, the first to the second and the second and the like are only referred to to distinguish between the different components, and are not limited to the order of manufacture, and their names are used in the description and the claims. It may not match.

For reference, terms related to a direction or a position (up, up, down, down, one side, the other side, etc.) in the description of the embodiments of the present application are described based on the arrangement state of each component shown in the drawings. For example, an upper side may mean an upper side based on the vertical direction, and may mean an upper side based on FIGS. 3 and 6, and a lower side may refer to a lower side based on the vertical direction, referring to FIGS. 3 and 6. It may mean the lower side. In addition, one side may mean the left side based on FIG. 3, and the other side may mean the right side based on FIG. 3.

1 is a schematic flowchart of a fire door manufacturing method according to an embodiment of the present invention.

Hereinafter, a method of manufacturing a fire door according to an embodiment of the present invention will be referred to as 'this method' for convenience of description.

Referring to Figure 1, the method (fire door manufacturing method) includes a cutting step (S1), bending step (S2), installation step (S3), coupling step (S4) and bonding step (S5).

Cutting step (S1) is cut into a metal plate to produce a plurality of panels (P). Cutting step (S1) may be performed by a cutter (not shown) for cutting the metal plate. Since a cutter (not shown) will be apparent to those skilled in the art, more detailed description will be omitted.

The metal plate is to be manufactured by the panel P after the cutting step (S1), to give rigidity to the fire door prepared by the present method, is formed of a metal material that is easy to bend in the bending step (S2) described later.

A plurality of panels (P) manufactured after the manufacturing step (S1) may form the front or rear of the fire door manufactured by the present method and form the outer shell of the fire retardant (FR) to be described later.

For example, the metal plate may be formed of a metal material having excellent melting point and stiffness, moldability, etc. due to the properties of the fire door manufactured by the present method.

FIG. 2 is a view for explaining a bending step, and FIG. 3 is a view for explaining a panel including a fitting part and a fitting counterpart.

1 to 3, the bending step S2 is bent by one side of the plurality of panels P by the roller molding machine 2 and formed into fitting portions P1, and the plurality of panels P The other side of the) is bent to form a fitting portion (P2).

Here, one side may mean the left side based on FIG. 3, and the other side may mean the right side based on FIG. 3.

For example, the roller molding machine 2 may include a plurality of rollers, and the plurality of rollers may form the molding grooves 21 along the circumference of the outer periphery. A plurality of panels P manufactured in the cutting step S1 by an operator or a conveying unit (not shown) are supplied to the roller molding machine 2, and the plurality of panels P supplied to the roller molding machine 2 are It moves in one direction by unidirectional rotation of the roller, and is bent by the above-described forming groove 21 to form the fitting portion P2 on the other side of the panel P (one of the panel P). Of course, the fitting portion P1 may be molded by the roller molding machine 2).

As described above, the present invention can form a plurality of panels P quickly by molding the fitting portions P1 and the fitting counterparts P2 to the plurality of panels P continuously by the roller molding machine 2. There is an advantage that the manufacturability is improved.

The bending step S2 may be performed by various bending machines (not shown) in addition to the roller molding machine 2.

For example, referring to FIG. 3, the panel P after the bending step S2 will be described in more detail.

Fitting portion P2 may be bent inward from the other side of the panel (P). Here, the inner side is toward the center line along the longitudinal direction of the panel P (front-rear direction in FIG. 6 to be described later), and upwards to face one side direction (left direction based on FIG. 3). Upwards) may be bent.

In addition, the fitting portion P1 may be bent vertically (for example, upwardly and upwardly based on FIG. 3) at one side of the panel P, and the front of one panel P and the other panel ( In the situation where the rear surface of P) faces, the end portion of the fitting portion P1 may be bent in one direction to be fitted to the fitting portion P2. Here, one side direction may mean a left direction based on FIG. 3.

In another example, the fitting counter P2 may be bent in one direction from the other side of the panel P, and the end thereof may be bent again in the other direction, and the end of the fitting part P1 may be bent at one side. It may be bent vertically but the end is bent toward the other direction.

As such, the fitting coupling part (P1) and the fitting counterpart (P2) is fitted in the fire door prepared by the present invention, the coupling between the panel (P) after the bonding step (S4) and the bonding step (S5) to be described later. This has the advantage that it can be made more robust.

1 to 3, the bending step S2 is a width direction parallel to a direction connecting one side and the other side in the plurality of panels P (left-right direction based on FIG. 6 to be described later). Both ends (ends in the front direction and the end in the rear direction in accordance with FIG. 6 to be described later) are formed vertically (example upward) bent to form a step prevention molding step (3) It may include.

The step forming step (not shown) may be performed by the roller molding machine 2 or the bending machine (not shown).

Departure prevention portion (P3) will be described in more detail in the following description.

4 is a view for explaining the process of applying the adhesive to the panel, Figure 5 is a view for explaining the fire retardant.

1, 4 and 5, the installation step (S3) arranges the fire retardant (FR) on one surface of any one of the plurality of panels (P).

Before arranging the fire retardant FR on one side of the plurality of panels P in the installation step S3, any one of the plurality of panels P on one side of the plurality of panels P Adhesive 3 for adhesion of one side and the fire retardant FR may be applied. Adhesive 3 is commonly used in the art, more specific description thereof will be omitted.

The adhesive 3 may be evenly applied to one surface of any one of the plurality of panels P by an operator or the like.

Also, the fire retardant FR may be housed in the mold F by way of example. Here, the mold (F) is composed of a plate and a circumference of the plate to form a vertically projecting side wall of the plate to form an accommodating space for accommodating the fire retardant (FR) inside, the fitting portion of the panel (P) ( The separation of the mold F is suppressed by P1), the fitting counter P2, and the separation preventing part P3.

In the installation step (S3), the mold (F) is also coated on one side with an adhesive (3), so that the flame retardant (FR) is adhered, and the other side of the mold (F) is one surface of any one of the plurality of panels (the adhesive (3). ) May be adhered to and disposed on one surface to which it is applied.

In this way, by adhering any one of the plurality of panels P and the fire retardant FR through the adhesive 3, the panel P is loaded by the load of the fire retardant FR in the state of standing on the fire door manufactured by the present method. It can be suppressed that the departure-avoidance part (P3) and the like of the deformation, damage.

For example, the fire retardant FR may include mineral fiber (mineral fiber). In addition, the mineral fiber may include at least one of glass fiber and glass wool.

As such, the fire door prepared by the present invention includes a fire retardant (FR) containing mineral fiber, so that it does not burn well and is well resistant to high temperatures, is light and heat resistant, absorbs sound and is easily altered. There is an advantage that is not.

6 is a view for explaining a state in which any one of the plurality of panels after the bonding step and the other one is coupled.

Referring to FIGS. 1 and 6, the coupling step S4 includes the fitting coupling part P1 and the fitting counterpart P2 in a state in which one surface of the plurality of panels P and the other surface thereof face each other. It is the step of fixing it.

Here, one surface is a surface facing the direction in which the fitting portion P1 protrudes. One surface of one of the plurality of panels (P) and the other surface of the other face, and the inner surface of the fitting portion (P1) of any one of the plurality of panels (P) in the longitudinal direction (see Fig. 6 A plurality of panels facing the inner surface of the other one fitting portion P1) and the other inner side of the fitting part P1 facing the line extending in the vertical direction from the center line of the outer surface extending in a direction parallel to the front-back connecting direction). In the state in which the other of (P) is inverted (one of the plurality of panels P faces upward (upward with reference to FIG. 6) and the other facing downward (lower with reference to FIG. 6), Fit one of the fitting portion (P1) and the other fitting portion (P2) of the panel (P) of the fitting. Similarly, one of the plurality of panels (P) fitting the fitting portion (P2) and the other fitting fitting portion (P1) to fit.

As described above, since the fire retardant FR is disposed on one surface of any one of the plurality of panels P, after the bonding step S4, the fire retardant FR is formed different from any one of the plurality of panels P. One accommodating space (one of the plurality of panels P, one of the fitting portion (P1), fitting corresponding portion (P2), one side of the separation prevention portion (P3) and the other, fitting portion (P1), fitting The flame retardant FR (including the mold F) may be accommodated in the corresponding part P2 and the space formed by the separation prevention part P3.

In this way, the fitting coupling portion (P1) and the fitting corresponding portion (P2) is fixed by the fitting, there is an advantage that the coupling between the panel (P) can be made more robust.

In addition, it is possible to suppress the release of the fire retardant FR from the accommodation space in the state where the fire door manufactured by the present method is erected by the above-described release prevention part P3.

7 is a diagram for explaining a seaming machine.

1 and 7, the bonding step S5 is a step in which one of the plurality of panels P and the other are bonded by the seaming machine 5. Through this, the state in which each of the fitting coupling portions P1 and the fitting corresponding portions P2 are coupled to each other is fixed in the coupling step S4.

The seaming machine 5 is commonly used in the art, and a detailed description thereof will be omitted.

8 is a diagram for explaining a protective film.

1 to 8, as described above, the panel P of the fire door manufactured by the present method is easy to bend (form) and provide sufficient rigidity due to its use characteristics, and may be formed of a metal material having a high melting point. It was.

Fire doors manufactured by the present method are opened and closed due to their characteristics, so that external force may be repeatedly applied, and scratches, deformations, breakages, warpage, etc. may occur, and corrosion may occur due to cleaning and external moisture.

Therefore, the panel P may include a protective film G on its outer surface to protect it from such a harsh environment.

Referring to FIG. 8, the protective film G will be described in detail. The panel P further includes a protective film G provided on an outer surface of the protective film G, and the protective film G is formed on the outer surface of the panel P. In addition, the heat-generating layer (G2) provided on the upper portion of the penetration layer (G1) and the protective layer (G3) provided on the heat generating layer (G2) is characterized in that it may comprise.

Such a protective film (G) has excellent buffering and waterproofing effects on its own, and in particular, when electricity is applied to the heat generating layer (G2), the protective film (G) is heated to about 300 ° C., so that the penetration layer (G1) is melted, and thus fine pores or fine bends on the outer surface thereof. By sintering after filling, it not only has improved bonding strength, but also prevents lifting, thereby providing more robust protection and waterproofing (in the accompanying drawings, the micropores and microflexes are exaggerated).

In a specific embodiment, the penetrating layer (G1) comprises 20 parts by weight of polyvinyl acetate-based low-shrinkant and 50 parts by weight of the pressure-sensitive adhesive containing hydrogenated lozenter resin and polybutene, relative to 100 parts by weight of polyethylene.

For each composition, polyethylene is a component that is aliquoted from naphtha of petroleum, and is added as a thermoplastic resin, and has been adopted in that it has excellent water resistance and has a melting point of about 130 ° C. Each composition of the permeation layer (G1) is determined based on 100 parts by weight of this polyethylene.

In addition, the polyvinyl acetate-based low shrinkage agent is added as an anti-shrinkage agent for preventing the phenomenon of excessive contraction during the sintering of the penetrating layer (G1) and the lifting occurs. It is preferable that such a polyvinyl acetate-based low shrinkage agent is included in 20 parts by weight. If the polyvinyl acetate-based low shrinkage agent is less than the above range, the shrinkage preventing effect is insufficient.

In addition, the pressure-sensitive adhesive is added to impart adhesion to the penetrating layer (G1) to reinforce the binding force in micropores, fine bends, and the like, and particularly includes a hydrogenated ester of resin and polybutene. . The hydrogenated lozenster contributes heat resistance after sintering while imparting initial adhesion, and polybutene imparts tackiness. It is preferable that such an adhesive contains 50 parts by weight, but if it is less than the above range, the adhesive force is lowered.

The permeation layer (G1) is formed by injecting each composition into a polyethylene solution at a temperature of 130 ° C. or higher at which polyethylene can be melted, followed by sintering.

Next, the heat generating layer G2 includes 200 parts by weight of silver and 200 parts by weight of a functional binder including titanium dioxide and molybdenum dioxide, based on 100 parts by weight of ruthenium dioxide. The heating layer (G2) is characterized in that it is applied to the upper portion of the penetration layer (G1) in the form of a paste.

For each composition, ruthenium dioxide is a transition metal of the platinum group, which is provided in powder form to form the heat generating layer G2 in the form of a paste. When the ruthenium dioxide is excessively used, the exothermic temperature may be so high that it may damage the protective layer G3 to be described later. Therefore, the ruthenium dioxide may not exceed 20% by weight of the total composition of the exothermic layer G2. Each composition of the exothermic layer G2 is determined based on 100 parts by weight of this ruthenium dioxide.

And silver (Ag) is a transition metal, like ruthenium dioxide, is also provided in the form of a powder to form a heat generating layer (G2) in the form of a paste. It is preferable that such silver is included in an amount of 200 parts by weight. When used below the above range, it is difficult for the heating layer G2 to have a sufficiently low resistance value for generating current, and when used over the above range, the exothermic temperature becomes excessive. There is.

And functional binders are added for the combination of ruthenium dioxide and silver, and additionally facilitate the dispersion between the components, provide shortening of the exothermic saturation time and sustaining the exothermic effect. Functional binders include titanium dioxide and molybdenum disulfide. Titanium dioxide contributes to the sustaining of the exothermic effect. Particularly, molybdenum disulfide is a compound in which the molar ratio of molybdenum and silicon is 1: 2. The heat generation layer (G2) is prevented from melting at the time of heat generation, and silica is formed at a high temperature to shorten the heat generation effect and the heat generation saturation time considerably. It is preferable that such a functional binder is included in 200 parts by weight, when used in less than the above range, the effect is insufficient expression, when used in excess of the above range occurs a problem that the electrical flow at high temperature exotherm unstable.

The heating layer (G2) is ethylene glycol (terpene), butyl carbitol, ethyl cellosolve, ethyl benzene, isopropyl benzene, methyl ethyl ketone, dioxane, acetone, cyclohexanone, 3-methoxybutyl acetate, and the like It is prepared through a kneading process after mixing the compositions in an organic solvent.

Next, the protective layer G3 includes 300 parts by weight of a filler including calcium carbonate and bentonite, 100 parts by weight of naphthenic oil and 50 parts by weight of a heat resistant agent including barium aluminate and zirconia, relative to 100 parts by weight of butyl synthetic rubber. do.

For each composition, butyl synthetic rubber was employed in that it had appropriate cold resistance and heat resistance, had relatively high elasticity, and was excellent in thermal insulation effect. The protective layer (G3) is determined based on 100 parts by weight of butyl synthetic rubber.

And fillers include calcium carbonate and bentonite, calcium carbonate is used to add waterproofness, bentonite is relatively excellent in cation exchange capacity, can be firmly bonded, if the crack occurs in the protective layer (G3), moisture absorption It has the effect of preventing leakage while expanding through. In particular, the fillers are all composed of a composition having excellent binding strength can be made excellent compatibility between the protective layer (G3) and the penetration layer (G1). The filler is not particularly limited in use, but it is preferable to include 300 parts by weight from the viewpoint of increasing the bonding strength and economics.

And naphthene oil was added as a plasticizer, and it was employ | adopted in the point that there is little evaporation loss at high temperature, it is excellent in cold resistance, and can add an elastic retention effect. It is preferable that such naphthenic oil contains 100 parts by weight, and when used below the above range, flexibility and workability are lowered, and when it is used above the above range, the viscosity is excessively lowered so that the operation of the heating layer G2 is performed. Falling occurs and the crying phenomenon of the protective layer G3 occurs.

And the heat resistant agent is added to add heat resistance so that the protective layer (G3) to withstand the heat generated by the heat generating layer (G2) without melting, in particular to allow the protective layer (G3) to withstand high temperatures of 300 ℃ or more. The heat resistant agent includes barium aluminate and zirconia, which is added as a binder for combining zirconia with other compositions, and zirconia has a melting point of about 2700 ° C., excellent resistance to rapid temperature changes, and at least 1000 It is added to allow the protective layer G3 to withstand low thermal conductivity, heat resistance and fire resistance even at a high temperature of higher than or equal to ℃. In particular, the protective layer (G3) has a plurality of internal pores by the heat resistant agent, these pores lower the thermal conductivity and add heat resistance. It is preferable that such a heat resistant agent is included in 50 parts by weight, but when used outside the above range, the heat resistance is rather deteriorated.

The protective layer (G3) is prepared by mixing the naphthenic oil with each composition in powder form, and may further include a predetermined functional additive as necessary.

In the embodiment relating to the construction of the protective film (G), the penetration layer (G1) is laminated on the test block formed with the fine pores and fine bends, the heat generating layer (G2) is applied on the upper part, and then the protective layer on the upper part After stacking (G3), electricity was applied to the heat generating layer (G2) to form a protective film (G). When the cross section was enlarged and observed by cutting the test block in which the protective film G was formed, it was confirmed that the penetration layer G1 penetrated and hardened | cured in micropores and microbend | curve. In addition, cross-cut test, scratching test, and internal invasion test through water spraying were performed on the formed protective film G. The peeling rate was less than 0.5%, and the breaking rate was less than 3%. No invasion was detected at all.

The present invention described with reference to the accompanying drawings may be variously modified and changed by those skilled in the art, and such variations and modifications should be construed as being included in the scope of the present invention.

Panel: P Fitting: P1
Fitting part: P2 Breakaway part: P3
Roller molding machine: 2 Molding groove: 21
Fire Retardant: FR Mold: F
Glue: 3 Seaming Machine: 5

Claims (4)

Cutting a metal plate to produce a plurality of panels;
A bending step of bending one side of the plurality of panels by a roller molding machine to form a fitting part, and bending the other side of the panel to a fitting part;
An installation step of arranging a fire retardant on any one surface of the plurality of panels;
A coupling step of fitting and fixing the fitting coupling part and the fitting counterpart in a state in which one surface of the plurality of panels and the other surface thereof face each other; And
Joining one of the plurality of panels to the other by a seaming machine;
Including,
The fitting portion is bent inward from the other side of the panel,
The fitting portion is bent vertically at one side of the panel but bent in one direction so that the end is fitted to the fitting counterpart,
The bending step includes a stepped molding step in which both ends formed in a width direction connecting one side and the other side are vertically bent and molded into a breakaway prevention part.
The panel includes a protective film on the outer surface, the protective film includes a penetrating layer in contact with the outer surface of the panel, a heating layer provided on the upper layer and the protective layer provided on the heating layer,
The penetrating layer comprises 20 parts by weight of polyvinyl acetate-based low-shrinkant and 50 parts by weight of a pressure-sensitive adhesive containing hydrogenated Rosenster resin and polybutene, relative to 100 parts by weight of polyethylene,
The heat generating layer includes 200 parts by weight of silver and 200 parts by weight of a functional binder including titanium dioxide and molybdenum dioxide, based on 100 parts by weight of ruthenium dioxide,
The protective layer comprises 300 parts by weight of a filler containing calcium carbonate and bentonite, 100 parts by weight of naphthenic oil and 50 parts by weight of a heat resistant agent including barium aluminate and zirconia, relative to 100 parts by weight of butyl synthetic rubber. Fire door manufacturing method. delete delete delete

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