JP6745511B2 - Reinforcement cloth for urethane foam molding and method for producing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a urethane foam molding reinforcing cloth and a method for manufacturing the same, and more specifically, it is excellent in workability, safety, certainty, and economical efficiency during manufacturing, and has high quality urethane foam. The present invention relates to a urethane foam molding reinforcing cloth capable of obtaining a molded body and a method for producing the same.

Conventionally, as a method for manufacturing a urethane foam molding reinforcing cloth and a urethane foam molded article using the same, as shown in FIG. 9, a thermoplastic resin magnetic material T made of a thermoplastic resin containing magnetic powder is used as the surface of a nonwoven fabric. There has been proposed a urethane foam molding reinforcing cloth 100 that is soaked in and fixed in a part of the above and a method for manufacturing a urethane foam molded article using the same (Patent Document 1).

The above-mentioned conventional technique is proposed as a method for eliminating the peeling of the magnetic substance piece in the conventional technique of fixing the magnetic substance piece to the cloth with a double-sided tape.
When such peeling occurs, a defective molded product occurs in which urethane leaks out between the reinforcing cloth and the molding die and the urethane is exposed on the surface of the molded product.

JP, 2015-48544, A

The urethane foam molding reinforcing cloth 100 using the conventional thermoplastic resin magnetic material T has the following problems.
(1) Since it is generally necessary to heat a thermoplastic resin to a temperature of 130° C. or higher to bring it into a molten state, it is necessary to prepare a special and expensive discharge device (extruder), and there is a risk of burns. There is a waste of energy.
(2) Due to the viscosity of the thermoplastic resin, a phenomenon occurs in which the yarn is pulled between the extruder and the nozzle of the extruder, the surface of the thermoplastic resin magnetic material T on the reinforcing cloth does not become flat, and The adhesion becomes weak, and the problem that the thermoplastic resin magnetic material T "falls off" from the mold occurs.
Moreover, it is necessary to remove the stretched resin like pulling a thread.
(3) After the thermoplastic resin is hardened, it loses flexibility and does not have shape conformability to the mold, which also causes a problem that the thermoplastic resin magnetic material T "falls off" from the mold.
(4) When a thermoplastic resin having a low melting point is used in order to improve the shape following property to the mold after the thermoplastic resin is cured, the thermoplastic resin remelts and adheres to the mold during urethane foam molding. There is a problem that it ends up.
In addition, when the thermoplastic resin is remelted, the urethane foam molding reinforcing cloth 100 is peeled from the mold, resulting in a defective molded product such as urethane squeezing out to the surface side of the molded product. There is.
(5) The molten thermoplastic resins are easily bonded to each other when they come into contact with each other, and thus when the cloths overlap with each other, there is a problem that they cannot be used as a reinforcing cloth for urethane foam molding.

In addition, the conventional method for manufacturing the reinforcing cloth 100 for urethane foam molding has the following problems.
(6) Since the melted thermoplastic resin tends to drip, the work procedure of pushing the tip of the nozzle against the cloth and then extruding the melted thermoplastic resin is adopted. The efficiency of the work to place it in is not good.

That is, in the conventional urethane foam molding reinforcing cloth and its manufacturing method, in the technique of impregnating and immobilizing the magnetic carrier containing the magnetic powder on a part of the surface of the nonwoven fabric, (1) an expensive device (2) The surface of the magnetic material or its carrier fixed to the reinforcing cloth is made flat, and (3) the resin makes the thread (4) The magnetic material carrier fixed to the reinforcing cloth has excellent flexibility and shape conformability. (5) The magnetic material fixed to the reinforcing cloth during urethane foam molding is used. We would like to solve the problem that the carrier melts and adheres to the mold, and it becomes impossible to maintain the close contact between the reinforcing cloth and the mold. 7) There is a problem that the work of continuously arranging the magnetic carriers at a plurality of locations should be efficient and quick.

Therefore, the present invention solves all of the above problems in the conventional urethane foam molding reinforcing cloth and the manufacturing method thereof, workability during manufacturing, safety, reliability, economic efficiency, excellent promptness, and, An object of the present invention is to provide a urethane foam molding reinforcing cloth capable of obtaining a high-quality urethane foam molded article and a method for producing the same.

The present invention relates to a urethane foam molding reinforcing cloth in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible nonwoven fabric, wherein the magnetic silicone is a liquid silicone rubber containing a magnetic powder. It is composed by including a part of it soaks into the inside of the non-woven fabric and is integrated with the non-woven fabric. The urethane foam molding reinforcing cloth is the most important feature.
In the urethane foam molding reinforcing cloth of the present invention, the weight ratio of the liquid silicone rubber to the magnetic powder may be in the range of 40:60 to 70:30.

Further, the present invention is a method for producing a urethane foam molding reinforcing cloth in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible non-woven fabric, the liquid metering device, and the liquid. A nozzle having a plurality of small holes on the end face portion, which is connected to a constant-quantity discharge device, and magnetic silicone obtained by mixing liquid silicone rubber and magnetic powder are prepared, and the nozzle is formed using the liquid constant-quantity discharge device. After extruding the magnetic silicone from the end face portion of, the method for producing a urethane foam molding reinforcing cloth, by pressing the end face portion of the nozzle against the surface of the non-woven fabric, to apply the required amount of magnetic silicone to the surface of the non-woven fabric It is characterized by.

In the method for producing a reinforcing fabric for urethane foam molding according to the present invention, the nozzle has an inner diameter of a small hole formed in an end surface portion thereof within a range of 0.5 mm to 1.5 mm and is formed in the end surface portion. It is preferable that the number of the small holes is set so that the magnetic silicone does not drip during the work even if the required amount of the magnetic silicone is pushed out to the end face portion of the nozzle.

In the method for manufacturing a urethane foam molding reinforcing cloth according to the present invention, the end surface portion of the nozzle may have a ridge having a height of 0.05 mm to 0.3 mm formed on the periphery.
Further, in the method for producing a reinforcing fabric for urethane foam molding of the present invention, the required amount of magnetic silicone extruded at one time from the end face portion of the nozzle is in the range of 0.07 g to 0.33 g, and the end face of the nozzle is area parts is in the range of 80 mm ² 500 mm ^2, the number of small holes formed in the end face of the nozzle may be within 5 to 49 amino range.

Furthermore, the present invention relates to a method for manufacturing a urethane foam molding reinforcing cloth in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible non-woven fabric. A nozzle connected to the device and having a plurality of small holes in the end face, and magnetic silicone obtained by mixing liquid silicone rubber and magnetic powder are prepared,
By extruding the magnetic silicone from the end face of the nozzle using the liquid discharge device, pressing the end face of the nozzle against the surface of the nonwoven fabric, further, by continuously extruding the magnetic silicone from the end face of the nozzle, magnetic A method for producing a reinforcing fabric for urethane foam molding, which comprises applying silicone in a strip shape (including linear shape) to the surface of the non-woven fabric. Is featured.

The reinforcing foam for urethane foam molding of the present invention in which the magnetic silicone configured as described above is partially arranged and fixed does not require heating of the magnetic silicone during production, and not only excellent workability and economical efficiency, Since the silicone rubber does not melt even if it is heated by the mold after curing, it is possible to use magnetic silicone having a low viscosity and avoid the phenomenon of string pulling.
Therefore, in the present invention, the surface of the magnetic silicone after curing is in a flat state, and since the flexibility can be maintained even after the liquid silicone rubber is cured, the adhesiveness to the urethane foam molding die is excellent, It is possible to provide a urethane foam molding reinforcing cloth capable of significantly reducing the occurrence of defective products in urethane foam molding.

By setting the weight ratio of the liquid silicone rubber and the magnetic powder within the range of 40:60 to 70:30, the viscosity of the obtained magnetic silicone does not become too high, and a urethane foam molding die is obtained. It is possible to provide a urethane foam molding reinforcing cloth that does not have insufficient adhesion with the attached magnet.
That is, if the amount of the magnetic powder is increased so that the weight ratio of the liquid silicone rubber to the magnetic powder exceeds 40:60, the viscosity of the obtained magnetic silicone becomes too high, which hinders stable production of the magnetic silicone. There is a risk that such problems may occur and workability may be reduced.
Further, if the amount of the magnetic substance powder is reduced so that the weight ratio of the liquid silicone rubber and the magnetic substance powder is lower than 70:30, the adhesion force between the magnet mounted on the urethane foam molding die may be insufficient. There is.

In the method for producing a urethane foam molding reinforcing cloth in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible non-woven fabric according to the present invention, the liquid metering device is used to discharge the reinforcing cloth from the end surface of the nozzle. By extruding the magnetic silicone and then pressing the end surface of the nozzle against the surface of the non-woven fabric so that the required amount of magnetic silicone is applied to the surface of the non-woven fabric, there is no risk of burns, low cost, and quick Further, it is possible to provide a reinforcing cloth for urethane foam molding which has excellent adhesion to the urethane foam molding die and can significantly reduce the occurrence of defective products in urethane foam molding.

In the method for producing a urethane foam molding reinforcing cloth in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible non-woven fabric according to the present invention, the small holes formed in the end surface portion of the nozzle are When the inner diameter is in the range of 0.5 mm to 1.5 mm, the production efficiency of the urethane foam molding reinforcing cloth can be increased, and the occurrence of defective products in urethane foam molding can be significantly reduced.
Here, when the inner diameter of the small hole formed in the end face portion of the nozzle is smaller than 0.5 mm, the discharge pressure may become too high, or the discharged magnetic silicone may be elongated and droop.
Further, when the inner diameter of the small hole formed in the end face of the nozzle is larger than 1.5 mm, the phenomenon that the liquid silicone rubber pulls the thread may occur.

In the method for producing a reinforcing fabric for urethane foam molding of the present invention, when a protrusion having a height of 0.05 mm to 0.3 mm is formed around the end face portion of the nozzle, the surface of the flexible nonwoven fabric is The magnetic silicone can be accurately and efficiently arranged and fixed so as to be exposed flat.
Here, when a ridge having a height of less than 0.05 mm is formed around the end face portion of the nozzle or when the ridge is not provided, the nozzle slides on the non-woven fabric and the magnetic silicone is placed in the correct position. It may not be possible to apply and apply the correct thickness.
On the other hand, when a protrusion having a height of more than 0.3 mm is formed around the end surface of the nozzle, the flatness of the surface of the cured magnetic silicone may be impaired.

In the method for producing a reinforcing fabric for urethane foam molding of the present invention, the required amount of magnetic silicone extruded at one time from the end surface portion of the nozzle is within the range of 0.07 g to 0.33 g, and the area of the end surface portion of the nozzle is There is in the range of 80 mm ² 500 mm ^2, when the number of the small holes formed in the end face of the nozzle is within five to 49 pieces of range, the effect of the present invention as described above It can be enjoyed more reliably.
Here, if the required amount of magnetic silicone extruded from the end face portion of the nozzle at one time is less than 0.07 g, the adhesion force with the magnet mounted on the urethane foam molding die may be insufficient.
On the other hand, when the required amount of the magnetic silicone extruded from the end surface of the nozzle at one time is more than 0.33 g, the magnetic silicone may stick out from the end surface of the nozzle or the surface of the magnetic silicone after curing may be roughened. There is.

Furthermore, if the area of the end face of the nozzle is smaller than 80 mm ² , the adhesion force with the magnet mounted on the urethane foam mold may be insufficient, and if it is larger than 500 mm ² , the magnet may be accidentally attracted to the adjacent magnet. There is a risk that the magnetic silicone will be wasted and the magnetic silicone will be wasted.
If the number of small holes formed in the end surface of the nozzle is less than 5, the surface of the magnetic silicone after curing may not be flat, or the magnetic silicone may drip.
On the other hand, even if the number of small holes formed in the end face portion of the nozzle is more than 49, the effect is not improved, and the ejection amount of the magnetic silicone may be too large.

In the method for manufacturing a reinforcing fabric for urethane foam molding of the present invention, magnetic silicone is extruded from the end face of the nozzle using a liquid discharge device, and then the end face of the nozzle is pressed against the surface of the nonwoven fabric, and further, the end face of the nozzle. When the magnetic silicone is applied in a strip shape on the surface of the nonwoven fabric by continuously extruding the magnetic silicone from the above, the work of applying the magnetic silicone to a plurality of places can be simplified and the work efficiency can be improved.
Further, it is possible to prevent the leakage of urethane even in a complicated shaped portion of the urethane foam molding die by eliminating a gap between the magnetic silicone arranged on the urethane foam molding reinforcing cloth and the urethane foam molding die.

FIG. 1 is a plan view, an enlarged partial sectional view, and a sectional view of a urethane foam molding die of a reinforcing cloth for urethane foam molding according to an embodiment of the present invention. FIG. 2 is a table showing the results of evaluating the practicality of the magnetic silicone used in the present invention. FIG. 3 is a front view showing an outline of the inside of a liquid dispensing apparatus and nozzles used for applying magnetic silicone onto a nonwoven fabric when manufacturing the urethane foam molding reinforcing cloth of the present invention. FIG. 4 is a perspective view showing an end surface portion of a nozzle and an inner surface of the nozzle used when manufacturing the urethane foam molding reinforcing cloth of the present invention. FIG. 5 is a front view showing a plurality of other embodiments of the end surface portion of the nozzle used when manufacturing the urethane foam molding reinforcing cloth of the present invention. FIG. 6 is a flow chart showing the method for producing the urethane foam molding reinforcing cloth of the present invention. FIG. 7 is a plan view of another embodiment of the urethane foam molding reinforcing cloth embodying the present invention. FIG. 8 is a flow chart showing another method for manufacturing the urethane foam molding reinforcing cloth of the present invention. FIG. 9 is an enlarged partial sectional view of a conventional urethane foam molding reinforcing cloth provided with a thermoplastic resin magnetic material.

The present invention relates to a urethane foam molding reinforcing cloth in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible nonwoven fabric, wherein the magnetic silicone is a liquid silicone rubber containing a magnetic powder. It is composed by including a part of it soaks into the inside of the non-woven fabric and is integrated with the non-woven fabric. The present invention provides a “urethane foam molding reinforcing cloth” and a manufacturing method thereof, which can be preferably embodied by the embodiments described below.
An embodiment of a urethane foam molding reinforcing cloth embodying the present invention and a method for producing the same will be described below with reference to the drawings.

As shown in FIG. 1, a urethane foam molding reinforcing cloth 10 according to an embodiment of the present invention is for manufacturing a urethane foam molding part of an automobile seat, and is made of a non-woven fabric made of organic fibers. And is cut according to the shape of the back side of the backrest of the automobile seat.
The urethane foam molding reinforcing cloth 10 is configured such that the magnetic silicone M cured in a state of being exposed on the surface side of the nonwoven fabric is partially arranged and fixed.
Since the liquid silicone rubber contains the magnetic powder, the magnetic silicone M has flexibility even after being cured, and also has magnetism to be attracted to the magnet.

Specifically, a thin disk-shaped magnetic silicone M having a diameter of about 18 mm and a thickness of about 0.3 mm is arranged and fixed at a plurality of places on the urethane foam molding reinforcing cloth 10 at positions separated from each other by several cm to several tens of cm. Has been done.
The magnetic silicone M is attracted to the magnet fixed so as to be embedded in the urethane foam molding die 1, whereby the urethane foam molding reinforcing cloth 10 is arranged at the correct position in the urethane foam molding die 1. In this state, the urethane foam molding die 1 can be brought into close contact with the inner surface thereof.
This urethane foam molding reinforcing cloth 10 provides a gap for degassing the gas in the mold 1 when the urethane 2 containing a foaming agent is injected into the mold 1 for foam molding. It has a function of protecting the surface of the urethane foam-molded product and preventing the foamed urethane 2 from directly making contact with the metal part and producing abnormal noise.

The non-woven fabric used in one embodiment of the present invention may be the same as that conventionally used, and is made of synthetic fiber such as polyester fiber, polypropylene fiber or polyethylene fiber, and has a thickness of 0. A thin and flexible material having a weight per unit area of about 5 mm to 3.0 mm and a weight per unit area of about 50 to 200 g/m ² can be preferably used, but a cloth such as other non-woven fabric having breathability, flexibility and appropriate strength. It is also possible to use.
Further, the nonwoven fabric used for the urethane foam molding reinforcing cloth 10 of the present invention may be a single layer or a multilayer.

The practicality of the magnetic silicone M used in the present invention is evaluated according to the weight ratio of the liquid silicone rubber and the magnetic powder as shown in FIG. That is, if the content of the magnetic powder is too large, the viscosity will increase too much, and if the content of the magnetic powder is too small, the adhesion with the magnet will be insufficient.
From the results of the practicability evaluation shown in FIG. 2 above, as the magnetic silicone M used in one embodiment of the present invention, the weight ratio of the liquid silicone rubber to the magnetic powder is 40:60 to 70:30. It is preferably within the range, and in a preferred embodiment, the weight ratio of the liquid silicone rubber to the magnetic powder is 50:50.
The magnetic silicone M that can be preferably used in the present invention is a viscous liquid (paste) before contacting with air, and most of it penetrates into the inside of the nonwoven fabric and is integrated with the nonwoven fabric, and at room temperature. By absorbing moisture (humidity) in the air, it hardens into a rubber-like state, but maintains flexibility.

Further, since the magnetic silicone M that can be suitably used in the present invention is composed of liquid silicone rubber and metal powder, even after it is cured into a rubber-like state by contacting with moisture in the air, the magnetic silicone M is -40°C. The morphological stability and flexibility can be maintained in the temperature range of degrees to 150 degrees Celsius.
Therefore, even if the urethane foam molding die 1 is heated during the urethane foam molding, the magnetic silicone M does not melt or the property does not change, and the urethane foam molding reinforcing cloth 10 adheres to the urethane foam molding die 1 closely. The state is stable, and it is possible to prevent defective urethane foam molded products from occurring.

Further, since the surface of the magnetic silicone M cured by being integrated with the urethane foam molding reinforcing cloth 10 on the surface of the urethane foam molding reinforcing cloth 10 is flat and has flexibility, The adhesiveness and the shape followability to the molding die 1 are good, and the state of being strongly attracted to the magnet arranged in the molding die 1 can be stably maintained even during molding.

Further, as the material/raw material for the magnetic powder in the present invention, powdered materials of iron, nickel, ferrite, compounds and alloys thereof, which have the property of being adsorbed by a magnet, can be preferably used.
The particle size of the magnetic powder in the present invention may be about 15 to 500 μm as in the case of the conventional magnetic powder using a thermoplastic resin magnetic material.
Then, in a preferred embodiment, ferric oxide having an average particle size of 25 μm can be used in consideration of safety, stability, availability and handling.

The magnetic silicone M that can be preferably used in the present invention is a liquid silicone rubber of "Sealant 45" manufactured by Shin-Etsu Chemical Co., Ltd. located at 2-6-1, Otemachi, Chiyoda-ku, Tokyo, and an iron powder company. It can be obtained by mixing ferric oxide having an average particle size of 25 μm available from Co., Ltd. as a magnetic powder.
As an example of the above-mentioned magnetic substance powder, iron powder for filler of RDL-500 manufactured by Powder Tech Co., Ltd., which is located at 217 Juyo-217, Kashiwa City, Chiba Prefecture, can be mentioned.

The coating amount of the magnetic silicone M (diameter 18 mm) of the present invention containing 50% of the liquid silicone rubber and 50% of the magnetic powder in the weight ratio of the liquid silicone rubber and the magnetic powder, and the magnet obtained by the magnetic silicone M. In order to test the relationship of the attraction force with the, the permanent magnet is attracted to the cured magnetic silicone M and then the permanent magnet is pulled up, and the attraction force between the two is measured, and the following results are obtained. It was

Application amount: Adsorption force with magnet 0.08g: Approximately 0.06kgf
0.12 g: about 0.10 kgf
0.14g: about 0.12kgf
0.16g: About 0.14kgf

Permanent magnet used: Mitsuya Co., Ltd. 7-18-47 Kano, Higashiosaka City, Osaka Prefecture
Magnet hook MHB-500
Pulling rate of permanent magnet: 90 mm/min

Here, when the same test was performed with a coating amount actually used for a conventional thermoplastic resin (diameter 15 mm) to which 40% by weight of magnetic powder was added, the following results were obtained.
Application amount: Adsorption force with magnet 0.18g: About 0.10kgf
The amount of iron powder in this applied amount is almost the same as the amount of iron powder in the applied amount of 0.14 g in the case of the magnetic silicone M. Therefore, even if the same amount of iron powder is used, in the case of the magnetic silicone M, the attraction force with the magnet is high.

As described above, the reason why the measurement result that the adsorption force obtained by the conventional thermoplastic resin magnetic material is low even with the same iron powder amount is obtained is that the surface of the thermoplastic resin magnetic material is not flat. It is considered that this is because the hardened thermoplastic resin magnetic material has low flexibility, which impairs the adhesion to the magnet surface.

That is, according to the magnetic silicone M of the present invention, it has been clarified that even if the amount of the magnetic silicone M used is reduced, it is possible to obtain the same attractive force as in the conventional case.
Furthermore, since the magnetic silicone M of the present invention has high flexibility even after curing and is excellent in adhesiveness with the curved portion of the molding die 1, even if the adsorption force is the same, A gap is unlikely to be generated between them, and the occurrence of defective molded products due to the urethane foam 2 leaking out can be reduced.
Further, when the magnetic silicone M is applied onto the non-woven fabric, the occurrence of defects due to "stringing" can be significantly reduced.

When 0.15 g of the magnetic silicone M of the present invention was applied onto a non-woven fabric and cured, a product (diameter: about 18 mm) was folded in half and its flexibility was measured. The average was 0.046 kgf and it was bent into a "U" shape. I was able to.
Similarly, 0.18 g of a conventional thermoplastic resin magnetic material was applied onto a non-woven fabric and cured (a diameter of about 18 mm) was folded in half and its flexibility was measured, and it was found that it was bent into a "U" shape. An average of 1.103 kgf was required.
From the above measurement results, it is clear that the magnetic silicone M of the present invention maintains flexibility even after curing.

In order to produce the magnetic silicone M used in one embodiment of the present invention, a one-component condensation reaction type liquid silicone rubber which does not require heating and magnetic powder are put in a degassing mixer and mixed. By doing so, it is possible to easily manufacture.
In addition, by adding a heating device to the nozzle 32 portion of the syringe 31 connected to the liquid fixed amount discharge device 30, the magnetic silicone M obtained by mixing the liquid silicone rubber and the magnetic substance powder, which causes a curing reaction by heating, is obtained. It can also be used.

Further, when the magnetic silicone M obtained by mixing the liquid silicone rubber that causes a curing reaction by heating with the magnetic powder without using a heating device at the nozzle 32 portion, the magnetic silicone M is applied. It is also possible to heat the urethane foam molding reinforcing cloth 10 to cure the magnetic silicone M, and dispose and fix the magnetic silicone M on the nonwoven fabric forming the urethane foam molding reinforcing cloth 10.
That is, even when the magnetic silicone M obtained by mixing the liquid silicone rubber which undergoes a curing reaction by heating and the magnetic powder is used, it has flexibility and heat resistance even after curing as in the present invention, It is possible to obtain the urethane foam molding reinforcing cloth 10 including the magnetic silicone M in which the incidence of defective products in urethane foam molding is significantly reduced.
However, when the above configuration is adopted, unlike the present invention, the time and effort of the heat treatment and the disadvantages associated with the heating are incurred.

In the method for manufacturing the urethane foam molding reinforcing cloth 10 of the present invention, in order to dispose and fix the magnetic silicone M on the nonwoven fabric, a liquid fixed amount discharge device 30 and a syringe 31 connected to the liquid fixed amount discharge device 30. The nozzle 32 is attached to the tip of the syringe 31 and has a plurality of small holes 32a on the tip (end face).
The liquid constant-volume discharge device 30 is connected to a compressed gas source 33, and supplies a predetermined amount of compressed air to the syringe 31 from a solenoid valve 35 whose drive time is controlled by a control circuit 34, thereby supplying a predetermined amount of liquid. What can be discharged can be preferably used.
An uncured and pasty magnetic silicone M is filled in the syringe 31 connected to the liquid fixed-quantity discharge device 30, and the nozzle 32 is attached to the tip of the syringe 31.

As the liquid constant-volume discharge device 30 as described above, a general-purpose device which is not equipped with a heating device and which can be obtained at a relatively low cost can be used, and for example, it is located in Shimorenjaku 8-7-4, Mitaka City, Tokyo. An air pulse type dispenser "MS-1D" manufactured by "Musashi Engineering Co., Ltd." can be used.
By using such a liquid fixed amount discharge device 30, the discharge amount of the magnetic silicone M can be precisely controlled and can be supplied from the end surface of the nozzle 32 by a constant amount, and the discharge amount can be appropriately increased or decreased. You can also
Further, the liquid fixed amount discharge device 30 can also control the electromagnetic valve 35 so that the magnetic silicone M is continuously discharged from the end surface portion of the nozzle 32.

In a preferred embodiment, the end surface portion of the nozzle 32 has a diameter of a plane portion in which the small hole 32a is formed is 18 mm and an area is about 255 mm ² , and the diameter of the small hole 32a is 1 mm.
Further, in one preferred embodiment, the number of the small holes 32a is 25 as shown in FIG. 4, and the end faces of the nozzles 32 are evenly arranged so as to have a constant space therebetween. Good.

In a preferred embodiment, the end surface of the nozzle 32 is provided with a ridge 32b having a height of 0.1 mm and a width of 1 mm on the periphery.
The protrusion 32b can prevent the end surface of the nozzle 32 from slipping when the end surface of the nozzle 32 is pressed onto the nonwoven fabric. Further, the protrusion 32b makes it possible to make the thickness of the magnetic silicone M applied onto the non-woven fabric constant and to make the surface shape of the applied magnetic silicone M flat.
The height of the protrusion 32b is preferably in the range of 0.05 mm to 0.3 mm.
When the height of the protrusion 32b is 0.05 mm or less, the effect of preventing the end surface of the nozzle 32 from slipping on the nonwoven fabric is lost. Further, if the height of the protrusion 32b is 0.3 mm or more, the surface of the applied magnetic silicone M may be difficult to be flat.

It is convenient that the nozzle 32 is made of a synthetic resin and is of a screw-in type so that it can be easily replaced when the small hole 32a is clogged.
The method for producing a urethane foam molded article using the urethane foam molding reinforcing cloth 10 in which the magnetic silicone M is partially arranged and fixed is a conventional urethane foam molding in which the thermoplastic resin magnetic material is partially arranged and fixed. The method is the same as when using a reinforcing cloth.
Specifically, first, the nonwoven fabric is fixed to the mold 1 and covered with a heat-resistant film, then heated with high-temperature steam to reduce the pressure inside the heat-resistant film so that the shape of the nonwoven fabric is the shape of the mold 1. Then, the nonwoven fabric is taken out from the cooled mold 1.

After that, an appropriate amount of paste-like magnetic silicone M is discharged from a small hole 32a penetrating the end surface of the nozzle 32 connected to the liquid constant-volume discharge device 30, and the end surface of the nozzle 32 is pressed against a predetermined position of the nonwoven fabric. The magnetic silicone M is applied and stamped on the non-woven fabric.
Then, a part of the magnetic silicone M penetrates into the inside of the nonwoven fabric, and the liquid silicone rubber is cured by contacting with air and reacting by reacting with moisture (humidity) in the air, and is integrated with the nonwoven fabric to form a predetermined nonwoven fabric. The urethane foam molding reinforcing cloth 10 is fixed in position (see steps S11 to S14 shown in FIG. 6), and can be manufactured easily, quickly and safely.
Here, before the nozzle 32 is pressed onto the nonwoven fabric, a predetermined amount of the magnetic silicone M is discharged to the end surface of the nozzle 32 in advance to apply the magnetic silicone M to a plurality of locations. It can be further speeded up.

Further, the magnetic silicone M coated on a non-woven fabric has a finger dry time according to JIS K 6249 of 5 minutes at 23 degrees Celsius and 50% RH, and 35 minutes to 45% RH at 5 degrees Celsius. Was 25 minutes.
Then, as long as the urethane foam molding reinforcing cloth 10 immediately after production is lightly overlapped with each other, uncured magnetic silicone M is not bonded to each other or bonded to another urethane foam molding reinforcing cloth 10. , No practical problem occurs.
Therefore, it is possible to suppress the occurrence of defective products of the urethane foam molding reinforcing cloth 10.

After arranging the non-woven fabric in which the magnetic silicone M is fixed at this predetermined position, that is, the urethane foam molding reinforcing cloth 10 according to the present invention along the inner surface of the urethane foam molding die 1 in which the magnet is embedded at a predetermined position. Then, urethane 2 containing a foaming agent is injected into the mold 1 to foam.
At this time, the cured magnetic silicone M is excellent in heat resistance and flexibility and adheres strongly to the magnet of the molding die 1 and is strongly adsorbed, so that the position of the urethane foam molding reinforcing cloth 10 is displaced in the molding die 1. Therefore, it is possible to avoid the formation of a gap between the urethane foam molding reinforcing cloth 10 and the molding die 1.
Therefore, the urethane foam molding reinforcing cloth 10 is bonded and integrated with the surface of the foamed urethane 2, and the urethane foam molded body molded so as to match the inner shape of the molding die 1 is taken out from the molding die 1. It is possible to manufacture a high-quality urethane foam molded article having no defective molding portion.
As a magnet embedded in the urethane foaming mold 1, for example, a neodymium magnet φ10×5 manufactured by Sankyo Supply Co., Ltd. located at 6-70-1F, Nakada 2-chome, Taishiro-ku, Sendai City, Miyagi Prefecture is preferably used. Can be used.

At the time of this molding, the non-woven fabric forming the urethane foam molding reinforcing cloth 10 plays a role of controlling discharge of air in the molding die 1 and generated gas in the die.
The urethane foam molding reinforcing cloth 10 of one embodiment of the present invention configured as described above does not require a heating device, and a magnetic material (magnetic silicone M) is simply formed on the nonwoven fabric forming the urethane foam molding reinforcing cloth 10. In addition, the magnetic material can be reliably arranged and fixed, and the magnetic material has excellent heat resistance and flexibility even after curing, and can be manufactured at low cost.

The shape of the nozzle 32 may be a cylindrical shape having a circular end surface, or a polygonal end surface such as a hexagon, an octagon, or a dodecagon.
The area of the end surface portion of the nozzle 32, as shown in FIG. 5, preferably a can be appropriately modified within the scope of 80 mm ² 500 mm ^2, the required amount of magnetic silicone M ejected once suitably Is in the range of 0.07 g to 0.33 g.
Since the liquid silicone rubber may be hardened and the small hole 32a on the end face of the nozzle 32 may be clogged with the nozzle 32, if it is made of resin and screwed, only the nozzle 32 can be easily replaced. It is possible to deal with clogging and deterioration of 32a.

The number of the small holes 32a provided in the end face portion of the nozzle 32 can be preferably set within the range of 5 to 49 in proportion to the area of the end face portion of the nozzle 32, but the magnetic silicone M drips. The amount can be appropriately increased or decreased within a range in which unevenness is not formed on the surface when it is applied or applied on a nonwoven fabric.
The diameter of the small hole 32a provided in the end face portion of the nozzle 32 is preferably within the range of 0.5 to 1.5 mm, and by setting it within these ranges, the magnetic substance powder may be clogged in the small hole 32a. It is possible to prevent the magnetic silicone M from dripping, to avoid stringing the magnetic silicone M, and to prevent the surface flatness of the magnetic silicone M cured on the nonwoven fabric from being impaired.
Further, regarding the shape (usually a circle, but may be a polygonal shape) and the size (diameter) of the small hole 32a provided in the end face portion of the nozzle 32, the magnetic silicone M may drop down, It can be appropriately changed within a range in which no unevenness is formed on the surface of the nonwoven fabric when applied.

As another embodiment of the present invention, like the urethane foam molding reinforcing cloth 20 shown in FIG. 7, the shape of the magnetic silicone M applied to the urethane foam molding reinforcing cloth 20 is not a dot shape but a strip shape. Alternatively, a linear application form may be adopted.
In this case, the nozzle 32 is pressed against the non-woven fabric while continuously ejecting the magnetic silicone M from the liquid constant-volume ejection device 30 or another liquid ejection device, and the nozzle 32 is moved to form a strip or a line on the non-woven fabric. The magnetic silicone M can be applied (see steps S21 to S24 shown in FIG. 8).

The present invention is not limited to the above embodiment, and may be implemented by appropriately changing the shape, quantity, arrangement, etc. of each part without departing from the spirit of the present invention.
For example, the present invention may be embodied and implemented in a urethane foam molding reinforcing cloth for manufacturing urethane foam molded articles of various shapes, such as a urethane foam molded part forming a seat surface of an automobile seat.

INDUSTRIAL APPLICABILITY The present invention is industrially applicable as a urethane foam molding reinforcing cloth capable of obtaining a high-quality urethane foam molding and a method for producing the same.

1 Urethane foaming mold 2 Urethane containing foaming agent (foam urethane)
10 Reinforcement cloth for urethane foam molding (one embodiment)
20 Reinforcement cloth for urethane foam molding (other embodiment)
30 Liquid dispensing device (liquid dispensing device)
31 Syringe 32 Nozzle 32a Small Hole 32b Ridge 33 Compressed Gas Source 34 Control Circuit 35 Solenoid Valve 100 Urethane Foam Reinforcing Fabric (Prior Art)
M magnetic silicone S11 to S14 procedure S21 to S24 procedure T thermoplastic resin magnetic material (prior art)

Claims (7)

A reinforcing cloth for urethane foam molding, in which magnetic silicone is partially arranged and fixed so as to be exposed flat on the surface of a flexible nonwoven fabric,
The magnetic silicone is composed of liquid silicone rubber containing magnetic powder, and a part of the liquid silicone rubber penetrates into the inside of the non-woven fabric and becomes integrated with the non-woven fabric. Reinforcement cloth for urethane foam molding, which maintains shape conformability and flexibility in close contact with a mold. The urethane foam molding reinforcing cloth according to claim 1, wherein the weight ratio of the liquid silicone rubber to the magnetic powder is in the range of 40:60 to 70:30. A method for producing a reinforcing fabric for urethane foam molding, in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible nonwoven fabric,
A liquid dispensing device,
A nozzle having a plurality of small holes in the end face portion, which is connected to the liquid constant-volume discharge device;
Magnetic silicone obtained by mixing liquid silicone rubber and magnetic powder,
Prepare
After the magnetic silicone is extruded from the end face of the nozzle using the liquid constant-volume discharge device, the end face of the nozzle is pressed against the surface of the non-woven fabric so that the required amount of magnetic silicone is applied to the surface of the non-woven fabric. A method for producing a reinforcing fabric for urethane foam molding, comprising: In the nozzle, the inner diameter of the small holes formed in the end surface portion is within a range of 0.5 mm to 1.5 mm, and the number of small holes formed in the end surface portion is equal to the required amount of magnetic silicone. The method for producing a reinforcing fabric for urethane foam molding according to claim 3, wherein the magnetic silicone is set so as not to hang down during the work even if the magnetic silicone is pushed out to the end face portion of the nozzle. .. The reinforcing cloth for urethane foam molding according to claim 3 or 4, wherein the end surface portion of the nozzle is formed with a ridge having a height of 0.05 mm to 0.3 mm on the periphery. Manufacturing method. The required amount of magnetic silicone extruded at a time from the end face of the nozzle is in the range of 0.07G～0.33G, the area of the end surface portion of the nozzle is in the range of 80 mm ² 500 mm ^2, wherein 6. The urethane foam molding reinforcement according to claim 3, wherein the number of small holes formed in the end surface portion of the nozzle is in the range of 5 to 49. Fabric manufacturing method. A method for producing a reinforcing fabric for urethane foam molding, in which magnetic silicone is partially arranged and fixed so as to be flatly exposed on the surface of a flexible nonwoven fabric,
A liquid ejection device,
A nozzle that is connected to the liquid ejection device and has a plurality of small holes in the end face portion;
Magnetic silicone obtained by mixing liquid silicone rubber and magnetic powder,
Prepare
By extruding the magnetic silicone from the end face of the nozzle using the liquid discharge device, pressing the end face of the nozzle against the surface of the nonwoven fabric, further, by continuously extruding the magnetic silicone from the end face of the nozzle, magnetic A method for producing a urethane foam molding reinforcing cloth, characterized in that silicone is applied to the surface of the non-woven fabric in a band shape.

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