JP2006231821A - Manufacturing method and manufacturing device of glass fiber reinforced rigid polyurethane foam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing device of a high-quality glass fiber reinforced rigid polyurethane foam by making a surface of a glass fiber mat a surface with high smoothness by evenly pressing it without generating unevenness on the surface as much as possible while contacting the moving glass fiber mat with little resistance, and by making it possible to supply a foaming raw liquid composition. <P>SOLUTION: The manufacturing method comprises a glass fiber mat supplying step supplying the glass fiber mat 3 on a lower surface material 2 supplied from a lower surface material supplying unit, a pressing step pushing and pressing the upper side of the supplied glass fiber mat 3 over its width direction, a raw liquid composition supplying step supplying the rigid polyurethane foam foaming raw liquid composition U on the supplied glass fiber mat 3, and an upper surface material supplying step continuously supplying an upper surface material 7 to the upper surface of the glass fiber mat supplied with the raw liquid from an upper surface supplying unit. The pressing step is carried out by pressing with a pressing means 4 having a large number of lines arranged in substantially equal pitch along the width direction on the glass fiber mat 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a method for manufacturing glass fiber reinforced rigid polyurethane foam and an apparatus for manufacturing the same, and more specifically, heat insulation panel for ultra-low temperature, in particular, heat insulation of a storage facility for storing LNG, liquefied helium, liquefied nitrogen, etc. The present invention relates to a method for producing a glass fiber reinforced rigid polyurethane foam that can be used as a heat insulating panel suitable for the present invention, and an apparatus for producing a glass fiber reinforced rigid polyurethane foam suitable for carrying out this production method.

  A rigid polyurethane foam reinforced with glass fibers that can be suitably used as an insulation material for ultra-low temperatures (hereinafter sometimes abbreviated as “RPUF”) generally has a glass fiber mat placed on the bottom material. Then, by supplying the foamed stock solution composition for forming the rigid polyurethane foam to the glass fiber mat and impregnating it, and then supplying the top surface material to make a sandwich structure, the nipping is performed by the nip roll, the reaction is performed, and the foaming is performed. Manufactured.

  A technique for producing a glass fiber reinforced rigid polyurethane foam by supplying a plurality of glass fiber mats during production is known (Patent Document 1). Patent Document 1 discloses a technique for lifting a glass fiber mat as foaming proceeds to reduce non-uniformity of glass fibers.

  According to this method for producing a glass fiber reinforced rigid polyurethane foam, a glass fiber mat such as a continuous strand mat is supplied by unwinding a commercial product as it is from a roll-shaped raw material. The binder that binds the intersections of the yarns is released to some extent by nipping with the nip roll, and is expanded in the thickness direction by the progress of foaming and curing of the foaming stock composition, but most are the intersections of the yarns Foam hardening of the foamed stock solution composition proceeds while being bound by the binder.

  Therefore, the supplied glass fiber mat is lifted as the foaming progresses, and a plurality of glass fiber mats exist uniformly in the thickness direction of the obtained glass fiber reinforced rigid polyurethane foam. The glass fibers constituting the fiber mat do not spread uniformly in the thickness direction, and in the formed glass fiber reinforced rigid polyurethane foam, portions with high and low glass fiber concentration are generated between the layers of the glass fiber mat and the like. There is a problem that the property is not sufficient and the strength is likely to vary. Not only the surface of the supplied glass fiber mat has irregularities, but when the foaming stock solution composition is supplied, it tends to accumulate in the recesses and becomes thin in the projections, and at the end of foaming, the foam layer in the projections A thin glass fiber reinforced rigid polyurethane foam is finished, resulting in a non-uniform product in the thickness direction.

In order to eliminate such problems, a roll is disposed between the glass fiber mat supplying step and the foaming stock solution composition supplying step, and the glass fiber mat supplied is pressed downstream and fed to the surface. A method of reducing the unevenness was considered.
JP 2001-150558 A

  However, since the glass fiber mat itself is pulled by a double conveyor or the like disposed on the downstream side, depending on the pressing by the roll, the pulling force acts on the glass fiber mat and the fiber is stretched, and the surface is likely to be uneven. . Therefore, it is necessary to rotationally drive the roll. However, in order to rotate and press the roll, it is not easy to control the rotation speed, and the mechanism is complicated to accurately rotate the roll. There is. In addition, if the roll itself is contaminated to form irregularities, the glass fiber mat surface is directly affected, which is not preferable, and there is a problem that the frequency of maintenance work increases.

  Therefore, in view of the above-described problems of the prior art, the object of the present invention is to press the surface of the moving glass fiber mat uniformly without causing unevenness as much as possible while making contact with the surface of the moving glass fiber mat with a small resistance. It is an object of the present invention to provide a method and an apparatus for producing a high-quality glass fiber reinforced rigid polyurethane foam by making the surface of the surface highly smooth and supplying a foaming stock solution composition thereto.

  The above object can be achieved by the invention described in the claims. That is, the characteristic configuration of the method for producing a glass fiber reinforced rigid polyurethane foam according to the present invention includes a glass fiber mat supplying step of supplying a glass fiber mat onto the lower surface material supplied from the lower surface material supply device, and the supplied glass fiber. A pressing process for pressing the mat over the width direction, a raw liquid supplying process for supplying the rigid polyurethane foam foam concentrate solution onto the supplied glass fiber mat, and an upper surface material supply device for the upper surface supplied with the raw liquid A top surface material supplying step for continuously supplying a top surface material, wherein the pressing step includes a plurality of linear pressing means arranged at substantially equal pitches across the width direction on the glass fiber mat. It is to be performed by pressing.

  According to this configuration, since the resistance is smaller than when pressing with a roll, there is almost no non-uniform pulling force acting on the glass fiber mat, and therefore, the fibers of the glass fiber mat are not unnecessarily stretched, In addition, since it is not necessary to provide a driving device, the structure is simplified, not only can the equipment cost be reduced, but also maintenance work can be reduced. There is no risk of adverse effects on the product. In addition, in the case of pressing by a roller, it is difficult to accurately grasp the pressing state because the pressing part cannot be visually recognized, but in the above configuration, the pressing state can be easily visually recognized, and the surface state is appropriately maintained. Easy to deal with. And since it becomes a surface press compared with the linear press by a roll, the smoothness of the surface increases reliably and a high quality glass fiber reinforced rigid polyurethane foam can be manufactured.

  As a result, while making contact with the surface of the moving glass fiber mat with a small resistance, the surface is pressed evenly without causing unevenness as much as possible to obtain a highly smooth surface, and the foaming stock composition is supplied to the surface. It was possible to provide a method for producing a high-quality glass fiber-reinforced rigid polyurethane foam.

  The linear pressing means includes an inclined portion extending in an inclined manner from the base toward the surface of the glass fiber mat to be conveyed, and a substantially horizontal direction bent from the middle of the inclined portion and the surface of the glass fiber mat. It is preferable that the parallel portion on the free end side extends to press the surface of the glass fiber mat.

  According to this structure, the whole surface of a glass fiber mat can be pressed more uniformly easily and reliably.

  It is preferable that the inclination angle of the inclined portion is set to 20 to 40 ° with respect to the glass fiber mat, and the front end of the parallel portion is directed slightly upward.

  According to this configuration, the pressing means can be pressed with an appropriate pressing force, and the contact resistance of the pressing means with respect to the glass fiber mat can be extremely reduced.

  Moreover, the characteristic structure of the manufacturing apparatus of the glass fiber reinforced rigid polyurethane foam according to the present invention includes a lower surface material supply device that supplies a lower surface material, and a glass fiber mat is supplied onto the lower surface material supplied from the lower surface material supply device. Glass fiber mat supply device, presser means for pressing the supplied glass fiber mat over the width direction, stock solution supply means for supplying rigid polyurethane foam foam concentrate solution to the glass fiber mat, and the stock solution supply means An upper surface material supply device that continuously supplies the upper surface material to the upper surface of the rigid polyurethane foam foam concentrate solution, wherein the pressing means is substantially over the width direction on the glass fiber mat. The object is to have a large number of linear members arranged at an equal pitch.

  According to this configuration, while making contact with the surface of the moving glass fiber mat with a small resistance, the surface is uniformly pressed without causing unevenness as much as possible to obtain a highly smooth surface. Products can be supplied, and a high-quality glass fiber-reinforced rigid polyurethane foam manufacturing apparatus can be provided.

  The linear member is inclined from the base to the surface of the glass fiber mat to be conveyed, and is inclined from the base. The linear member is bent from the middle of the inclined portion and extends substantially horizontally with the surface of the glass fiber mat. It is preferable that the parallel portion on the free end side presses the surface of the glass fiber mat.

  According to this configuration, the entire surface of the glass fiber mat can be pressed more uniformly.

  The inclination angle of the inclined portion is 20 to 40 ° with respect to the glass fiber mat, and in order to hold a large number of the linear members at a predetermined pitch interval, the linear members are provided with interval holding means. Preferably it is.

  According to this configuration, the pressing means can be pressed with an appropriate pressing force, and the pitch interval of a large number of linear members can be maintained at a predetermined interval, and the pressing force can be maintained substantially constant with respect to the entire width of the glass fiber mat. .

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration of a main part of a manufacturing apparatus suitable for carrying out the present invention. A lower surface material 2 is supplied onto the conveyor device 1 from a lower surface material supply device (not shown) arranged on the upstream side of the device, and a glass fiber material for reinforcement is supplied from the glass fiber mat supply device (not shown). A plurality of layers of glass fiber mats 3 are supplied onto the lower surface material 2. The upper surface of the glass fiber mat 3 conveyed downstream by the conveyor device 1 is pressed using a pressing jig 4 as a pressing means so that the surface of the glass fiber mat 3 is less likely to be uneven, and subsequently polyurethane. A rigid polyurethane foam stock solution composition (hereinafter sometimes referred to as a foam stock solution) U is supplied from the foam stock solution composition supply device 5, and the glass fiber mat is impregnated with the foam stock solution (nipping step).

  In FIG. 1, the foaming stock solution U is supplied from the polyurethane foaming stock composition supply device 5 by discharging the foaming stock solution from the shower nozzle, but this nozzle is swung left and right in the width direction using a single nozzle. The foaming stock solution U may be supplied while being moved, and the supply method is not particularly limited. Further, on both side surfaces of the glass fiber mat 3, the lower surface material 2 is raised to cover both side surfaces of the glass fiber mat 3, but only a part is shown in FIG. 1. Note that the figure number R indicates the conveyance direction.

  Next, an upper surface material 7 is supplied from an upper surface material supply device (not shown) via a roll 6 to generate a sandwich structure, but the foaming stock solution U starts to foam during the conveyance, and the conveyor device also from the upper surface side. (Not shown) is pressed and transported in a state where a predetermined thickness is secured. Furthermore, it passes through the area | region enclosed by the heating oven (illustration omitted) arrange | positioned downstream, it is made to foam-harden (foaming process), and a glass fiber reinforced rigid polyurethane foam is produced.

  In this case, in this embodiment, since the glass fiber mat 3 supplied on the lower surface material 2 is pressed by the pressing jig 4 over the width direction, unevenness is hardly caused. Accordingly, the glass fibers constituting the individual glass fiber mats spread uniformly in the thickness direction, and variations in strength are less likely to occur, and a high-quality molded product can be manufactured. The holding jig 4 includes a frame body 4a and a holding member 4b supported by the frame body 4a. The frame body 4a is fixed to pillars (not shown) provided on both sides of the conveyance line, and the glass fiber mat with an appropriate pressing force through a pair of air cylinders C provided at both ends of the frame body 4a. Can be pressed.

  The holding jig 4 will be described in more detail with reference to FIGS. As shown in FIG. 2 (the frame 4a is omitted to avoid complication), the holding member 4b constituting the holding jig 4 is substantially parallel to the conveying direction over the width direction of the conveying line at a predetermined interval. Piano wires 4c, which are a large number of linear members that are arranged in parallel and bent from the middle in the length direction, are joined to a base portion 4d having a square pipe shape by welding or the like. And the full width of the glass fiber mat 3 is pressed substantially uniformly by the parallel piano wire 4c. When the glass fiber mat 3 is pressed linearly in this way, the contact resistance with the surface of the glass fiber mat 3 can be reduced, and uniform pressing can be performed, and the surface irregularities of the glass fiber mat 3 can be effectively generated. Can be blocked.

  The piano wire 4c joined to the base part 4d is bent from the base part 4d toward the surface of the glass fiber mat 3 to be conveyed, and is inclined from the middle of the inclined part 4c1 to be glass fiber. It consists of the surface of the mat 3 and a free end side parallel portion 4c2 extending in a substantially horizontal direction. As the piano wire 4c, the surface of the portion touching the glass fiber mat 3 and the tip of the parallel portion 4c2 are preferably as smooth as possible without irregularities and burrs in order to avoid catching the fiber. When the total width H of the line is about 1000 mm and the piano wire 4c having a diameter of about 2 mm is used, the length L1 of the inclined portion 4c1 may be about 150 to 180 mm, and the length L2 of the parallel portion 4c2 may be about 50 to 100 mm. preferable. The tip of the parallel part 4c2 is preferably extended to a position close to the polyurethane foam stock solution composition supply device 5, and the glass fiber is as close as possible to the position where the foam stock solution is introduced into the glass fiber mat 3 as much as possible. Pressing the mat 3 can achieve uniform impregnation. In this case, unlike pressing with a roll, even if the foaming stock solution adheres to the piano wire 4c, the glass fiber mat 3 is hardly affected. However, in order to make the portion that touches the glass fiber mat 3 as small as possible, the tip of the parallel portion 4c2 is slightly directed upward, and the vicinity from the bent portion corresponding to the end of the inclined portion 4c1 to the parallel portion is the glass fiber mat 3 You may make it press in contact with. In that case, when an appropriate amount of weight is placed on the base portion 4d, the pressing force of the piano wire 4c can be adjusted, and the tip of the parallel portion 4c2 can be directed somewhat upward.

  The pitch p of the piano wire 4c is preferably about 20 to 40 mm, and more preferably 20 to 30 mm. If it is less than 20 mm, the contact resistance with the glass fiber mat 3 tends to increase, and if it exceeds 40 mm, the pressing force is reduced, which is not preferable for uniform pressing. In addition, in order to hold the pitch of the piano wire 4c at a predetermined interval, the piano wire 4c is tied and fastened to the front end side (near the bending point) of the inclined portion 4c1 by interval holding means 4f such as fiber yarns. It is preferable that the distance between the lines 4c is not easily changed by an external force. Furthermore, the inclination angle θ of the inclined portion 4c1 is preferably about 20 to 40 ° with respect to the horizontal surface of the glass fiber mat 3 being conveyed. If it does in this way, as shown in FIG. 1, when pressing the surface of the glass fiber mat 3 with the piano wire 4c, the inclination part 4c1 of the piano wire 4c makes it difficult to contact the glass fiber mat 3, and raises contact resistance. In addition, the pressing force can be adjusted appropriately. In addition, the figure number 4e is a handle for making it easy to attach the pressing member 4b to the frame 4a, and is not necessarily required, and is omitted in FIG.

  Next, the RPUF used in this embodiment will be described. This RPUF is formed by using a rigid polyurethane foam stock solution having excellent low-temperature insulation performance. The rigid polyurethane foam stock solution uses a component containing an active hydrogen-containing compound, a foaming agent, a catalyst, etc. (polyol component) and a component mainly composed of a polyisocyanate compound (isocyanate component), and a polyol using a foaming machine. A component and an isocyanate component are mixed and used for forming a glass fiber reinforced rigid polyurethane foam as a foamed stock solution composition.

  As the polyisocyanate compound constituting the isocyanate component, any polyisocyanate compound known in the technical field of polyurethane can be used. Specifically, 4,4′-diphenylmethane diisocyanate, 2,4-toluene diisocyanate, Aromatic diisocyanate compounds such as 2,6-toluene diisocyanate and naphthalene diisocyanate, aliphatic diisocyanates such as 1,6-hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), hydrogenated m-xylylene diisocyanate (HXDI) , Cycloaliphatic diisocyanates such as norbornane diisocyanate, crude MDI (44V-10, 44V-20, etc. (manufactured by Bayer)), uretonimine-containing MDI (liquid MDI) Millionate MTL; polyfunctional isocyanates of Nippon Polyurethane Industry) and the like.

  Said polyisocyanate compound may be used independently and may use 2 or more types together. Among the above polyisocyanate compounds, the use of crude MDI is preferred because of ease of handling, reaction speed, excellent physical properties of the resulting RPUF, and low cost.

  As the active hydrogen group-containing compound which is the main component of the polyol component, a compound generally known as a polyol compound can be used. In particular, aliphatic polyols, aromatic polyols, amine polyols and the like exemplified below are known as polyols for rigid polyurethane foams.

  The aliphatic polyol is a polyfunctional active hydrogen compound, that is, an aliphatic or alicyclic polyfunctional active hydrogen compound as a polyol initiator, an alkylene oxide, specifically, propylene oxide (PO), ethylene oxide (EO), styrene. Examples thereof include polyfunctional oligomers obtained by ring-opening addition polymerization of one or more cyclic ethers such as oxide (SO) and tetrahydrofuran.

  Examples of the polyol initiator include glycols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,3-butanediol, 1,6-hexanediol, and neopentyl glycol, and triols such as trimethylolpropane and glycerin. And tetrafunctional alcohols such as pentaerythritol, polyhydric alcohols such as sorbitol and sucrose, and water.

  A polyol compound obtained by ring-opening polymerization of lactones such as ε-caprolactone together with alkylene oxide or together with alkylene oxide can also be used.

  Amine-based polyols contain at least one alkylene oxide, specifically propylene oxide (PO), ethylene oxide (EO), styrene oxide (SO), tetrahydrofuran, or the like as a primary or secondary amine as a polyol initiator. It is a polyfunctional polyol compound obtained by ring-opening addition polymerization.

  Examples of the initiator include amines such as ethylenediamine, toluenediamine, and diphenylmethanediamine, and alkanolamines such as monoethanolamine and diethanolamine.

  Examples of the aromatic polyol include a method of adding the above-mentioned alkylene oxide to a polyfunctional active hydrogen compound having an aromatic ring in the molecule, an ester of an aromatic polycarboxylic acid and a polyhydric alcohol, and the like.

  Specific examples of the polyol compound obtained by adding the above-described alkylene oxide to a polyfunctional active hydrogen compound include compounds obtained by ring-opening addition of at least one of PO, EO, and SO to hydroquinone, bisphenol A, and the like. The

  Specific examples of esters of aromatic polycarboxylic acids and polyhydric alcohols include ester polyols having a hydroxyl group terminal between terephthalic acid, phthalic acid, isophthalic acid, and the like, and ethylene glycol, diethylene glycol, and the like.

  The polyol compound preferably has a hydroxyl value of 200 to 600 mgKOH / g and an average functional group number of 2 to 6.

  The above polyol compounds may be used alone, or two or more of them may be used in combination to form RPUF having more preferable characteristics.

  In the production of the rigid polyurethane foam, catalysts, flame retardants, foaming agents, colorants, antioxidants, and the like well known to those skilled in the art can be used.

  As a blowing agent, a fluorocarbon compound having a small ozone depletion coefficient, for example, a fluorine-containing compound such as HFC-134a, HFC-245fa, and HFC-365mfc, an aliphatic or alicyclic hydrocarbon such as cyclopentane and n-pentane, and the like Water can be used. In particular, the use of HFC-245fa and HFC-365mfc is preferable because of its excellent low-temperature heat insulation performance.

  Catalysts include metals such as triethylenediamine, N-methylmorpholine, N, N, N ′, N′-hexamethylethylenediamine, tertiary amines such as DBU, dibutyltin dilaurate, dibutyltin diacetate, and tin octylate. A system catalyst is illustrated as a urethanization reaction catalyst. In addition, when water is used as one component of the blowing agent, the organotin catalyst is hydrolyzed and deteriorated, and therefore a tertiary amine catalyst is preferably used.

  The use of a catalyst that forms an isocyanurate bond that contributes to improvement in flame retardancy in the structure of the polyurethane molecule is also preferred, and examples thereof include potassium acetate and potassium octylate. Some of the above-mentioned tertiary amine catalysts also promote the isocyanurate ring formation reaction. A catalyst that promotes isocyanurate bond formation and a catalyst that promotes urethane bond formation may be used in combination.

  Furthermore, a flame retardant may be added, and examples of suitable flame retardants include metal compounds such as halogen-containing compounds, organic phosphate esters, antimony trioxide, and aluminum hydroxide.

  These flame retardants may deteriorate the physical properties of the rigid polyurethane foam obtained when, for example, an excessive amount of organophosphate is added, and foam foaming behavior when an excessive amount of metal compound powder such as antimony trioxide is added. Therefore, the amount of addition is preferably limited to a range that does not cause such a problem.

  A plasticizer may be used as necessary. Such a plasticizer is also preferably one that contributes to flame retardancy. Halogenated alkyl esters of phosphoric acid, alkyl phosphate esters, aryl phosphate esters, phosphonate esters, and the like can be used. β-chloroethyl) phosphate (TCEP, manufactured by Daihachi Chemical), tris (β-chloropropyl) phosphate (TMCPP, manufactured by Daihachi Chemical), tributyl phosphate, triethyl phosphate, cresyl phenyl phosphate, dimethylmethylphosphonate, etc. can be exemplified. One or more of these can be used. The addition amount of the plasticizer is preferably 5 to 30 parts by weight with respect to 100 parts by weight of the polyol component. If this range is exceeded, problems such as insufficient plasticization effects and reduced physical properties of the foam may occur.

  As a stock solution for forming a rigid polyurethane foam, a commercially available stock solution using a component selected from the above-described components can be used. Specifically, Soflan R115-90F, Soflan R115-90H, etc. (Toyo Tire & Rubber) Kogyo Co., Ltd.) and the like are exemplified.

The glass fiber material used to reinforce the RPUF is preferably a glass fiber having a large aspect ratio. As a suitable material, a glass long fiber mat-like product, specifically, a chop strand mat, a continuous strand mat, etc. Is exemplified. It is preferable to use a continuous strand mat because it is excellent in impregnation property of RPUF foaming stock solution and reinforcing property of foam.
[Another embodiment]
(1) As the face material used in the present invention, various flexible face materials, high-rigid face materials and the like can be used. Specific examples of the highly rigid breathable plate-like face material include gypsum board, woody plywood, and calcium silicate board. Examples of the flexible face material include flexible face materials such as paper face materials, resin-laminated paper face materials, aluminum sheets, steel plates, resin films, etc., which can be used without limitation, but the physical strength of the sheet itself is good. It is equipped with an aluminum sheet, glass cloth, and resin coating layer for reasons such as that it does not corrode even when condensed water is generated when used in highly heat-insulating applications, and it has good reaction adhesive strength with rigid polyurethane foam. The use of composite materials is preferred. Since such an aluminum sheet composite face material does not have any organic compound permeability, the glass fiber reinforced rigid polyurethane foam obtained by using the aluminum sheet composite face material is particularly suitable as a heat insulating material for an LNG storage tank.

  When a releasable face material such as release paper or release film is used, the skin surface of the glass fiber reinforced polyurethane foam formed by peeling and removing the releasable face material is adhered to another rigid polyurethane foam. Is possible.

In particular, for a thermal insulation panel for LNG and the like that requires flatness accuracy and thickness accuracy, the entire circumference of the manufacturing block is cut by several tens mm.
(2) The number of layers of the glass fiber mat 3 is preferably 3 to 6 layers, but can be appropriately changed according to the use, specifications and the like.

1 is a schematic perspective view of an essential part of a manufacturing apparatus for a glass fiber reinforced rigid polyurethane foam according to an embodiment of the present invention. Partial perspective view of a holding jig used in the manufacturing apparatus of FIG. Left side view of the holding jig in Fig. 2 Front view of the holding jig shown in FIG.

Explanation of symbols

2 Lower surface material 3 Glass fiber mat 4 Holding means 4c Linear member 4c1 Inclined portion 4c2 Parallel portion 4d Base portion 4f Space holding means 7 Upper surface material U Hard polyurethane foam concentrate solution composition

Claims (6)

A glass fiber mat supplying step for supplying the glass fiber mat onto the lower surface material supplied from the lower surface material supply device, a pressing step for pressing the supplied glass fiber mat over the width direction, and the supplied glass fiber mat. A glass fiber reinforced hard comprising: a stock solution supplying step for supplying a rigid polyurethane foam foaming stock solution composition; and a top surface material supplying step for continuously supplying a top material from a top material supply device to the top surface supplied with the stock solution. A method for producing a polyurethane foam, comprising:
A method for producing a glass fiber reinforced rigid polyurethane foam, wherein the pressing step is performed by pressing with a plurality of linear pressing means arranged at substantially equal pitches across the width direction on the glass fiber mat. The linear pressing means includes an inclined portion extending in an inclined manner from the base toward the surface of the glass fiber mat to be conveyed, and a substantially horizontal direction bent from the middle of the inclined portion and the surface of the glass fiber mat. The method for producing a glass fiber reinforced rigid polyurethane foam according to claim 1, comprising a parallel portion on the free end side extending to the surface and pressing the surface of the glass fiber mat. The manufacturing method of the glass fiber reinforced rigid polyurethane foam of Claim 2 which makes the inclination-angle of the said inclination part 20-40 degrees with respect to a glass fiber mat, and makes the front-end | tip of the said parallel part slightly upward. A lower surface material supply device that supplies the lower surface material, a glass fiber mat supply device that supplies the glass fiber mat onto the lower surface material supplied from the lower surface material supply device, and a presser that holds the supplied glass fiber mat in the width direction. Means, a stock solution supplying means for supplying the rigid polyurethane foam foam concentrate solution to the glass fiber mat, and a top surface material continuously with respect to the top surface of the rigid polyurethane foam foam concentrate solution supplied by the concentrate solution means. An upper surface material supply device for supplying glass fiber reinforced rigid polyurethane foam,
The apparatus for producing a glass fiber reinforced rigid polyurethane foam, wherein the pressing means has a large number of linear members arranged at substantially equal pitches across the width direction on the glass fiber mat. The linear member is inclined from the base to the surface of the glass fiber mat to be conveyed, and is inclined from the base. The linear member is bent from the middle of the inclined portion and extends substantially horizontally with the surface of the glass fiber mat. The apparatus for producing a glass fiber reinforced rigid polyurethane foam according to claim 4, wherein the parallel part presses the surface of the glass fiber mat. The inclination angle of the inclined portion is 20 to 40 ° with respect to the glass fiber mat, and in order to hold a large number of the linear members at a predetermined pitch interval, the linear members are provided with interval holding means. The apparatus for producing a glass fiber-reinforced rigid polyurethane foam according to claim 5.

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