JP2001079951A - Production of siding board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce a siding board lined and filled with a high quality plastic foam material like hard urethane foam. SOLUTION: The extrusion of a plastic sheet 11 by an extruder 10, the embossing processing due to an embossing roll 12, the molding and cooling of a surface material by a former 20, nail hole processing by a nail hole punching machine 40, corona treatment by a corona treatment machine 42, the injection of a urethane raw soln. from an urethane injector 43, the covering of a backing material by a backing material delivery machine, the foaming of urethane in a heating oven 45, cutting by a cutter 46 and accumulation by an accumulation device 47 are performed continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a siding board, and more particularly to a method for manufacturing a siding board. For example, the present invention relates to a method for manufacturing a siding board in which rigid urethane foam is backed and filled.

[0002]

2. Description of the Related Art In recent years, a siding board in which a back surface of a plastic material, particularly a polyvinyl chloride surface material is filled with a urethane foam as a backing material, is frequently used as an exterior material satisfying heat insulation and rigidity. It is becoming. Further, in such a siding board, connecting portions for male and female fitting are provided on both sides in the width direction, so that adjacent siding boards can be reliably connected to each other.

[0003] The above-mentioned siding board is manufactured by a profile extrusion method, but the profile extrusion method has a disadvantage that the production speed is lower than that of the post forming method, and the surface cannot be embossed. Overseas, on the other hand, siding boards made of plastic alone are manufactured by the post-forming method. However, lining boards filled with urethane foam are rarely seen overseas.

Accordingly, an object of the present invention is to provide a method of manufacturing a siding board capable of efficiently and high-quality manufacturing a siding board backfilled with a plastic foam material such as urethane foam.

[0005]

In order to achieve the above object, a method of manufacturing a siding board according to the present invention is characterized in that a male connecting portion and a nail are provided on one side in the width direction of a plastic long surface material having a substantially trough-shaped cross section. A method for manufacturing a siding board having a punched portion and having a female connecting portion on the other side, and a plastic foam material backed and filled on the back surface, wherein the plastic sheet is melt-extruded from an extruder die. After embossing and forming into a predetermined surface material shape by a post forming method, a stock solution of a plastic foam material is injected into the back surface, covered with the back material, and then heated in a heating furnace to foam the plastic foam material. It is characterized in that each step is performed continuously.

Further, the present invention provides a softening temperature of 50 to 95 ° C.
Is melt-extruded into a sheet by a simple or co-extrusion method, and a roll having an embossed pattern is used for 90 to 2 times.
The surface is embossed at a temperature of 10 ° C., and the sheet-like polyvinyl chloride is bent into a predetermined surface material shape by a post forming method, and is cooled to 30 to 60 ° C. by water cooling.
After solidifying by quenching, the stock solution of the plastic foam material is injected into the back surface and covered with the back material, and then 15 to 12 in a heating furnace.
Each step of foaming the plastic foam by heating at a temperature of 0 ° C. for 1 to 10 minutes is continuously performed.

Further, the present invention relates to a method of bending and forming a polyvinyl chloride sheet, which is melt-extruded from an extruder die and subjected to embossing, into a predetermined surface material shape by a post forming method at a temperature of 100 ° C. or more. Into the cooling water tank equipped with a draining former that drains water by vacuum suction at both ends of the entrance and exit, and cooled so that the surface temperature difference between the two connecting parts and the central part becomes 10 ° C or less, and then plastic foam on the back side The method is characterized in that the plastic foam is foamed by injecting an undiluted solution of the material, covering the material with the back material, and then heating in a heating furnace.

In addition, the surface material before injecting the stock solution of the plastic foam is subjected to corona treatment, dichromic acid treatment or flame treatment to give a surface wetting index of 39 dyn / cm.
It is characterized by the above.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an example of a siding board manufactured by the method of the present invention, FIG. 2 is a sectional view showing a surface material of the siding board, and FIG. FIG. 4 is a schematic view showing an example of the manufacturing apparatus, FIG. 4 is a perspective view of a main part of the manufacturing apparatus, and FIG. 5 is a sectional view of the main part.

First, a siding board 2 backed and filled with a plastic foam material, for example, urethane foam 1
Is a surface material 3 obtained by molding a plastic sheet into a substantially gutter shape.
And the urethane foam 1 filling the back surface of the surface material 3 and the back material 4 covering the back surface of the urethane foam 1. On one side in the width direction of the surface material 3, a male connecting portion 5 and a nailing portion 6 are provided, and on the other side, a female connecting portion 7 is provided.

Such a siding board 2 is shown in FIG.
Can be manufactured by sequentially performing the steps shown in (1) and (2). First, a plastic material is put into an extruder 10 and a plastic sheet 1 having a predetermined thickness and a predetermined width is set.
1 is melt-extruded by a simple or co-extrusion method. As a plastic as a raw material, polypropylene, polycarbonate or the like can be used, but in consideration of bending by a post forming method, it is preferable to use polyvinyl chloride having a softening temperature of 50 to 95 ° C. The thickness is 0.5
５5 mm, usually about 1 mm.

Next, the plastic sheet 11 extruded from the die of the extruder is passed between a pair of rolls in which an embossing roll 12 having an embossed pattern and a rubber roll 13 are opposed to each other, and embossing is performed on the front side (lower side). Is applied. At this time, by setting the temperature of the embossing roll 12 to 90 to 210 ° C., embossing can be reliably performed. The depth of the embossing is arbitrary, but is 100 to 300 μm
The degree is optimal.

Next, after being cooled to a predetermined temperature, usually a softening temperature or higher, preferably 100 ° C. or higher by a cooling roll 14, it is introduced into a former 20 via a guide roller 15, and is formed into a predetermined shape by a post forming method. Mold into

The former 20 comprises a first preformer 21 and a second preformer 2 as shown in FIG.
2, metal former 23, first drainer former 24,
It has a water tank 25 and a second draining former 26, and is bent stepwise by the first and second preformers 21 and 22, and is finally formed into a predetermined shape by the metal former 23. .

The first and second drainers 24, 2
As shown in FIG. 5, reference numeral 6 denotes a portion having a passing portion of the surface material 3 formed in a predetermined shape between an upper die 31 and a lower die 32 which are fastened and fixed by a clamp 30. The slits 31 and 32 communicate with the surface material passing portion.
3, 34, and vacuum suction units 35a, 35b, 36a, 36b connected to a vacuum pump (not shown) or the like are provided at positions corresponding to both ends and the center of the surface material 3, respectively. This vacuum suction unit is designed to increase or decrease the amount of cooling water flowing through each unit by adjusting the degree of vacuum in each vacuum suction unit. When the degree of vacuum is increased, the flow rate of cooling water from the water tank 25 increases. Will be.

Then, the degree of vacuum in each vacuum suction unit is set optimally so that the surface temperature difference between the two connecting parts 5, 7 of the surface material 3 and the central part is 10 ° C. or less, while the temperature is lower than the softening temperature, for example. By quenching to 30 to 60 ° C., it is possible to prevent the product from being warped or bent, and in particular, it is possible to reduce the difference in the heat shrinkage between the connecting portions 5 and 7 and the central portion to 5% or less. Therefore, occurrence of waving can be prevented.

The setting of the degree of vacuum at this time varies depending on the thickness of the surface material 3 and the like. The degree of vacuum is -15 to -25
By setting the pressure to mHg, the cooling efficiency of the two connecting portions 5 and 7 having a complicated shape can be increased more than that of the central portion. It can be:

Further, since the urethane stock solution is injected and foamed in the subsequent step, the back surface of the surface material 3 is in a receiving pan state facing upward. It does not remain on the back surface of the surface material and adversely affect the adhesion to the urethane foam 1 and the like.

The surface material 3 formed into a predetermined shape and extracted from the second drainer former 26 is provided with a nail hole punch 4
Then, the nailing portion 6 is punched and formed by passing through a take-off roll 41 and sent to the next corona processing machine 42. The corona treatment device 42 performs a corona treatment on the back surface of the surface material 3, that is, the surface on which the urethane foam 1 is filled. By performing such a corona treatment to make the surface wetting index 39 dyn / cm or more, the adhesion between the surface material 3 and the urethane foam 1 can be improved, and a forced heating test (70 ° C., 3 hours) Also, the occurrence of the swelling phenomenon of the surface material 3 at the time of is eliminated. As a means for improving the surface wetting index, other treatments such as dichromic acid treatment and flame treatment can be employed, but corona treatment is most suitable for in-line treatment.

Next, a urethane injector 43 is provided on the back surface of the surface material 3, that is, on the back surface side subjected to corona treatment by the corona treatment device 42.
The urethane stock solution is injected. The injection amount of the urethane stock solution is set so that the thickness after foaming is 5 to 35 mm, and usually the foaming amount according to the depth of the surface material 3 (the dimension from the nailing portion 6 to the surface portion). . The urethane stock solution may be either a one-pack type or a two-pack type.

After injecting the urethane undiluted solution, its upper surface (back side)
Is covered with the back material 4 fed from the back material feeding machine 44. As the back surface material 4, aluminum kraft paper, plastic film, metal foil, metal evaporated film, or the like can be used.

The surface material 3 coated with the urethane stock solution and covering the back material 4 is sent to a heating furnace (foaming furnace) 45, and is heated to a predetermined temperature suitable for urethane foaming, for example, 1
The urethane foams when heated to 5 to 120 ° C., and the siding board 2 in the state shown in FIG. 1 is obtained. The siding board 2 manufactured in a continuous long state is cut into a predetermined length by a cutting machine 46,
It is loaded into a container or the like by the accumulation device 47.

As described above, extrusion of the plastic sheet 11 by the extruder 10, embossing by the embossing roll 12, molding and cooling of the surface material 3 by the former 20, nailing by the nailing punching 40, and the corona processing machine 42. Corona treatment, injection of the urethane stock solution from the urethane injector 43, coating of the back material 4 by the back material feeder 44, foaming of urethane in the heating furnace 45, cutting by the cutter 46 and accumulation by the accumulator 47. Is carried out continuously, a high-quality siding board 2 having a desired embossed pattern on the surface side, having no surface waving, and having excellent adhesion between the urethane foam 1 and the surface material 3 is continuously formed. It can be manufactured efficiently.

[0024]

As described above, according to the method for manufacturing a siding board of the present invention, a siding board having a surface pattern, no surface waving, and excellent adhesion between a plastic foam material and a surface material is obtained. Quality siding boards can be manufactured continuously and efficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a siding board manufactured by the method of the present invention.

FIG. 2 is a cross-sectional view showing a surface material of a siding board.

FIG. 3 is a schematic view showing an example of a manufacturing apparatus for carrying out the method of the present invention.

FIG. 4 is a perspective view of a main part of the manufacturing apparatus.

FIG. 5 is a sectional view of a drainer.

FIG. 6 is a plan view of the lower die.

FIG. 7 is a sectional side view of the same.

[Explanation of symbols]

1 ... urethane foam, 2 ... siding board, 3 ...
Front surface material, 4 back surface material, 5 male connection part, 6 nailing part,
7 ... female connector, 10 ... extruder, 11 ... plastic sheet, 12 ... emboss roll, 13 ... rubber roll, 14
... Cooling roll, 15 ... Guide roller, 20 ... Former, 21 ... First preformer, 22 ... Second preformer, 23 ... Metal former, 24 ... First drainer, 25 ... Water tank, 26 ... Second drainer Former, 30
... clamp, 31 ... upper die, 32 ... lower die, 33, 34 ... slit, 35a, 35b, 36a, 36b ... vacuum suction part, 40 ... nail hole punching, 41 ... take-up roll, 42
... Corona treatment machine, 43 ... Urethane injector, 44 ... Back material feeding machine, 45 ... Heating furnace, 46 ... Cutting machine, 47 ... Collecting device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shuji Sasaki 13-2 Satsukicho, Kanuma-shi, Tochigi F-term in Chuo Corporation (reference) 2E110 AA57 BA03 BA12 BD02 BD23 DA03 DC08 EA09 GA24Z GA32W GA32X GB01X GB42X GB43W GB46W GB48W GB54Z GB63X 4F213 AA15 AA31 AA42 AD17 AF01 AG03 AH47 AH81 WA04 WA06 WA18 WA53 WA56 WA72 WA73 WA75 WA83 WA84 WB01 WB13 WC01 WF01 WF27

Claims (4)

[Claims] 1. A plastic long surface material having a substantially gutter-like cross section has a male connecting portion and a nailing portion on one side in the width direction, a female connecting portion on the other side, and a plastic A method for manufacturing a siding board in which a foam material is backed and filled, wherein a surface of a plastic sheet melt-extruded from an extruder die is embossed, formed into a predetermined surface material shape by a post forming method, and then formed on a back surface. A method for producing a siding board, comprising: injecting an undiluted solution of a plastic foam material, covering with a backing material, and subsequently heating a heating furnace to foam the plastic foam material. 2. A long surface material made of polyvinyl chloride having a substantially trough-shaped cross section, having a male connecting portion and a nailing portion on one side in the width direction, a female connecting portion on the other side, and a back surface. A method for producing a siding board in which a plastic foam material is backed and filled therein, wherein polyvinyl chloride having a softening temperature of 50 to 95 ° C is melt-extruded into a sheet by a simple or co-extrusion method, and a roll having an embossed pattern is used. The surface is embossed at a temperature of 90 to 210 ° C., and the sheet-like polyvinyl chloride is bent into a predetermined surface material shape by a post forming method, and rapidly cooled to 30 to 60 ° C. by water cooling to be solidified. After injecting an undiluted solution of a plastic foam material into the back surface and covering the back surface material, the solution is heated at a temperature of 15 to 120 ° C. in a heating furnace.
A method for manufacturing a siding board, wherein each step of foaming the plastic foam material by heating for 10 to 10 minutes is continuously performed. 3. A long surface material made of polyvinyl chloride having a substantially gutter-shaped cross section, having a male connecting portion and a nailing portion on one side in the width direction, a female connecting portion on the other side, and a back surface. A method for manufacturing a siding board in which a plastic foam material is backed and filled into a siding board. It is bent into a material shape, and subsequently introduced into cooling water tanks each equipped with a draining former for draining by vacuum suction at both ends of the entrance and exit, so that the surface temperature difference between the two connecting portions and the central portion becomes 10 ° C. or less. The plastic foam material is foamed by injecting an undiluted solution of a plastic foam material into the back surface and coating the back material with the back material, followed by heating in a heating furnace. Ding board manufacturing method. 4. The surface material before injecting the stock solution of the plastic foam material is subjected to a corona treatment, a dichromic acid treatment, or a flame treatment so as to have a surface wetting index of 39 dyn / cm or more. Item 4. The method for producing a siding board according to item 1, 2, or 3.