JPS6257499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat insulating panel material in which a plate-shaped urethane foam layer is integrally covered with a metal plate from the surface to both end faces.

In general, this type of insulation panel material is produced by injecting a foamable urethane stock solution onto a metal plate with both ends bent upward, and then closing the open side of this metal plate with an appropriate mold to form a foamable urethane stock solution. It is manufactured by foaming under pressure.

In this case, the foamed urethane layer has no uneven foaming,
Moreover, it is possible to make a product with a smooth surface and high commercial value, but on the other hand, the airtightness per volume of the foamed urethane layer is large, resulting in a large overall weight, and moreover, a large amount of foamable urethane stock solution is required. In addition, since foaming is performed under pressure, a pressing means such as a mold is required, resulting in an increase in manufacturing costs.

On the other hand, the above problems can be solved by spontaneously foaming the foamable urethane stock solution, but in this case, the foaming of the foamable urethane stock solution becomes uneven and irregular irregularities occur on the surface. ,
Moreover, there is a problem in that gaps are created on both sides.

In addition, the exposed back side of the foamed urethane layer of such heat insulating panel material is protected by covering it with backing paper, but the backing paper is completely exposed to the back side of the insulating panel material. Since the adhesive is bonded to the adhesive, there is a problem that it may easily peel off from the edges or corners.

The present invention solves the above-mentioned conventional problems, and provides a lightweight and uniformly thick foamed urethane layer on a metal plate whose both ends are bent into upright bent pieces, and covers the foamed urethane layer. To provide a method for continuously and automatically manufacturing a heat insulating panel material having a structure in which the side edges of the backing paper are sandwiched between a foamed urethane layer and a foamed urethane layer by folding the folded pieces inward. be.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of an apparatus for carrying out the method of the present invention, in which reference numeral 1 denotes a metal hoop material having a constant width, made of a colored steel plate or the like, and wound around an uncoiler 7.

8 is a 12-stage primary forming machine that continuously forms the metal hoop material 1. As shown in FIG. 2, this primary forming machine 8 bends both ends of the metal hoop material 1 upward. At the same time, the upper and lower parts of the bent pieces are bent inwardly and outwardly in a dogleg shape, and these bent pieces form a connecting engagement piece 10a to be described later. A joining piece 10b is formed.

4 is a guide plate, and this guide plate 4 is arranged as shown in FIG. Above between the guide plates 4, the urethane stock solutions supplied from the urethane stock solution tank 11a for the P liquid and the urethane stock solution tank 11b for the R liquid are mixed to form a foamable urethane stock solution 6, which is placed on the metal between the guide plates 4. An air-mixing urethane injection device 9 is arranged for injection onto the hoop material 1.

Further, above the guide plate 4, a back paper holder 12 is arranged, in which a back paper 2 having a width approximately equal to the width of the upper surface of the metal hoop material 1 between the opposing surfaces of the bent pieces is wrapped, This back paper 2 is fed out in parallel above the metal hoop material 1 near the exit of the guide plate 4 at the same speed as the metal hoop material 1.

13 is a back paper meandering correction device for correcting the back paper 2 being fed out in a meandering manner.

3 is a Nippro roll, which presses the foamable urethane stock solution 6 injected onto the metal hoop material 1 from the upper surface of the back paper 2 to form the metal hoop material 1.
This is for spreading the foamable urethane stock solution 6 to a uniform thickness over the entire width between the facing surfaces of the paper and the back paper 2.

14 is a constant temperature furnace, in which the foaming urethane stock solution 6 is
This is for completely natural foaming.

15 is a heater for the constant temperature furnace 14;
This is for supplying hot air to 4.

Reference numeral 16 denotes a secondary forming machine for bending and forming the both-side bent pieces of the metal hoop material 1 further inward from the dogleg-shaped bent portion. 17 is a roller conveyor.

18 is a traveling cutting device, which cuts the metal hoop material 1;
The insulation panel material 5 is formed by cutting the insulation panel material 5 into predetermined lengths while moving in synchronization with the movement of the insulation panel material 5.

Next, a method for manufacturing the heat insulating panel material 5 will be explained based on FIG.

When the metal hoop material 1 is continuously fed out from the uncoiler 7 and supplied to the primary forming machine 8, both ends of the metal hoop material 1 are folded upward by the primary forming machine 8 as shown in FIG. The bent piece is formed by bending, and then extends below the guide plate 4. While passing through the guide plates 4, 4, the foamable urethane stock solution 6 is injected from the air mixing urethane injection device 9 onto the metal hoop material 1 between the guide plates 4, 4. The injected viscous foamable urethane stock solution 6 is collected on the metal hoop material 1 by the guide plate 4.

In order to prevent the foamable urethane stock solution 6 from overflowing from the guide plate 4, the amount of injection from the air mixing urethane injection device 9 is adjusted as appropriate, and the feeding speed of the metal hoop material 1 is adjusted appropriately.

On the other hand, at the entrance of the nip roll 3, the back paper 2 is continuously fed out so as to face the metal hoop material 1 with a small gap in between.
The foamable urethane stock solution 6 supplied between the back paper 2 and the metal hoop material 1 by pressing the upper surface with the nip roll 3 is spread uniformly in the width direction between the facing surfaces of the metal hoop material 1 and the back paper 2. Spread it out to a thickness.

Foaming urethane stock solution 6 that has been expanded in this way
After a so-called clean time, natural foaming gradually begins over the entire surface.

Next, the foaming urethane stock solution 6 is fed into a constant temperature furnace 14 to promote foaming and naturally foam, forming a foaming urethane layer 6' with a uniform thickness between the back paper 2 and the metal hoop material 1. . In this case, natural foaming involves forcibly suppressing foaming while applying a restraining force such as an external force to keep the thickness of the foam layer constant, whereas natural foaming involves applying no external force to foaming at all. This means to leave the foam as it is without causing any damage.

In this way, the foamable urethane stock solution 6 is spread to a uniform thickness by the Nipprol 3, so even if the above-mentioned natural foaming is carried out, the thickness of the foamable urethane layer 6' remains the same over the entire area. In addition to having a uniform thickness, the back paper 2 is bonded by the self-adhesive force of the foamed urethane layer 6'.

Next, the metal hoop material 1 leaving the constant temperature furnace 14 is
As shown in FIG. 2b, the rising bent pieces at both ends are bent inward by the secondary forming machine to cover the upper surface of both ends of the back paper 2, and the back paper 2 is Both ends are sandwiched between the upper surface of both sides of the foamed urethane layer 6' and the bent piece, and the ends of the bent pieces are further bent outward and connected to the connecting engagement piece 10a. and the engaged piece 10b. By the time the foam passes through the secondary molding machine 16, foaming has been completely completed.

Subsequently, the metal hoop material 1 is sent to a traveling cutting device 18 via a roller conveyor 17, and is sequentially cut into predetermined lengths to obtain a desired heat insulating panel material 5.

Furthermore, when connecting a plurality of heat insulating panel members 5, the engaged piece 10b for connection on one end side of the heat insulating panel material 5 engages with the engaging piece 10a on the other end side of the adjacent heat insulating panel member 5. It is something that is combined.

FIG. 4 shows another embodiment of the present invention, in which a traveling press cutting device 1 is installed next to the nip roll 3 and performs a cutting operation in synchronization with the traveling of the metal hoop material 1.
8' is provided to cut the metal hoop material 1 into predetermined lengths while the foamable urethane stock solution 6 is foaming.

In this case, since the foamable urethane stock solution 6 is spread over the metal hoop material 1 with a uniform thickness, there is no change in the thickness of the foam layer even if it is cut midway. In addition, since the front is also cut, cross-feeding is possible during the process, the length of the constant temperature furnace 14 is shortened, and the length of the secondary forming machine 16 is also shortened.
The length of the entire process line can be shortened.

In addition, when the thickness of the foamed urethane layer 6' after foaming is small, the guide plate 4 used in each of the above-mentioned embodiments is
Of course, as shown in FIG. 5, the positions may be placed on both sides of the metal hoop material 1 from the center to prevent both ends of the primarily formed metal hoop material 1 from touching the guide plate 4. . In this case, in order to spread the foamable urethane stock solution 6 toward the outside of the guide plate 4, both ends of the Nippro roll 3 are formed into tapered portions 3a that become smaller in diameter toward the end surface, and the foaming urethane stock solution 6 is The foaming urethane stock solution 6 is fed laterally.

As described above, according to the method for manufacturing a heat insulating panel material of the present invention, the metal hoop material that is continuously fed out is fed to the primary forming machine to form upright bent pieces on both side edges of the metal hoop material. After forming a bend and then injecting a foamable urethane stock solution onto this metal hoop material, a back paper having a width approximately equal to the width between the opposing inner surfaces of the bent piece is supplied onto the foamable urethane stock solution, and then The foamable urethane stock solution is pressed onto this backing paper using a nip roll, and the unfoamed foamable urethane stock solution is applied to the metal hoop material between the bent pieces on both sides along the bottom surface of the backing paper and the top surface of the metal hoop material. The paper is spread over the paper to a uniform thickness, and then the foamable urethane stock solution is naturally foamed, and then the folded piece is folded and formed on the upper side of the side edge of the back paper using a secondary forming machine. Therefore, the foamable urethane stock solution injected between the bent pieces on both sides of the metal hoop material is applied by pressing the backing paper placed along the top surface of the metal hoop material with a nip roll. The foamable urethane stock solution is then spread to a uniform thickness on a metal hoop material, and the foamable urethane stock solution is allowed to foam naturally in this state, making it possible to extremely reduce the density per volume of the foamable urethane layer, thereby reducing the overall weight. In addition, the amount of foamable urethane stock solution used is small, and pressing means such as molds are not required, so the manufacturing cost is low.In addition, the foamable urethane stock solution has a uniform thickness. Since it is completely covered with backing paper in the expanded state, the backing paper can prevent the foaming gas from dissipating randomly, and even though it is naturally foaming, there is no foaming unevenness and the foam has a uniform thickness. It can form a foamed urethane layer.

Furthermore, the back paper supplied on the metal hoop material is
Since the width is approximately equal to the width between the opposing inner surfaces of the bent pieces formed on both sides of the metal hoop material, the metal hoop material between the bent pieces is regulated by the inner surfaces of the bent pieces. After forming a foamed urethane layer with a uniform thickness by foaming the foamable urethane stock solution, the folded piece is folded onto the upper side of the side edge of the back paper using a secondary forming machine. Therefore, it is possible to obtain a heat insulating panel material in which the side edge of the backing paper is sandwiched and held between the upper surface of the side edge of the foamed urethane layer 6 and the folded piece, and the backing paper is held securely during use or handling. It can prevent peeling and reliably protect the foamed urethane layer.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a schematic configuration diagram of an apparatus for carrying out the method of the present invention;
Figures 2a and b are vertical sectional front views of the metal hoop material after primary and secondary forming, Figure 3 is a vertical sectional front view of the guide plate portion, and Figure 4 is a schematic configuration diagram showing another embodiment of the present invention. , FIG. 5 is a partially enlarged longitudinal sectional front view showing another example of the guide plate and the nip roll portion. DESCRIPTION OF SYMBOLS 1... Metal hoop material, 2... Back paper, 3... Niprol, 5... Heat insulation panel material, 6... Foaming urethane stock solution, 6'... Foaming urethane layer, 8...
Primary molding machine, 16... Secondary molding machine.

Claims (1)

[Claims] 1. The continuously fed metal hoop material is fed to a primary forming machine to bend and form rising bent pieces on both side edges of the metal hoop material, and then a foamable urethane stock solution is applied onto the metal hoop material. After injecting, supplying a back paper having a width approximately equal to the width between the opposing inner surfaces of the folded piece on top of the foamable urethane stock solution,
Next, the foamable urethane stock solution is pressed from above this backing paper with a nip roll, and the unfoamed foamable urethane stock solution is applied to the metal hoop between the folded pieces on both sides along the bottom surface of the backing paper and the top surface of the metal hoop material. It is characterized by spreading the paper to a uniform thickness, then allowing the foamable urethane stock solution to foam naturally, and then using a secondary forming machine to bend and form the folded piece onto the upper side of the side edge of the back paper. A method for manufacturing a heat insulating panel material.