JPH0428219B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a glass wool cylindrical body molding device for molding a glass wool cylindrical body from a glass wool mat in the form of a strip, and particularly relates to a glass wool cylindrical body with an improved curing treatment means. This invention relates to a molding device.

[Prior art] For example, as an apparatus for forming and manufacturing a glass wool cylindrical body used as a coating heat insulating material for air conditioning equipment piping, etc., an uncured belt-shaped glass wool mat (hereinafter also referred to as a belt-shaped material) is formed into a spiral shape. There is an apparatus that continuously forms the film by rolling it up into a shape and subjecting it to heat and pressure treatment.

Conventionally, as such a glass wool cylindrical body forming apparatus, as shown in Japanese Patent Application Laid-Open No. 59-87130, a mandrel with a large number of holes bored in the peripheral wall,
A guide sheet winding means for winding a thin strip-shaped heat-resistant guide rail around a mandrel in a spiral shape and advancing in one direction, and a strip-shaped material being polymerized on the guide sheet, wound in a spiral shape, and advancing in one direction. Some devices include a band-shaped material winding means, a heating roller that heats and presses the wound band-shaped material from the outer circumferential side, and a means for supplying hot air to the mandrel.

In this conventional device, the heating roller is arranged so that its axis is parallel to the mandrel, and its flat surface is pressed against the strip material to heat and pressurize the material. Then, the strip-shaped material advances while being heated from the inner circumferential side by hot air blown out from the holes in the peripheral wall of the mandrel, and is heated and pressurized from the outer circumferential side by heating rollers, thereby being hardened and formed into a cylindrical shape.

[Problems to be Solved by the Invention] Since the strip material (glass wool mat) supplied to the cylindrical body forming apparatus has variations in thickness and density, the pressing force from the heating roller does not necessarily act uniformly. It's hard to do. Further, even if the surface is heated and hardened with a heating roller, the heating roller is released before the hardening progresses to the inside, and a bulging portion may occur due to the restoring force of the internal uncured portion. As a result, irregularities on the inner and outer circumferential surfaces of the glass wool cylindrical body and cracks in the hardened surface layer are often observed.

Therefore, in recent years, when it is desired to improve fitting operability, adhesion, appearance, etc. when heat-retaining coating of piping, etc., it has become difficult to obtain satisfactory molded products using conventional equipment.

Incidentally, polishing the surface of the molded product may be considered, but there are also drawbacks such as the shavings are wasted and the number of steps increases.

[Means for Solving the Problems] In order to solve the above problems, the present invention improves the curing means in the conventional cylindrical body forming apparatus, and uses a belt-shaped glass wool mat wrapped around a mandrel. When the glass wool mat is passed through a heating furnace, a cylindrical drawing member with a smooth inner peripheral surface that heats and pressurizes the outer peripheral surface of the glass wool mat is provided near the heating furnace.

[Function] In the present invention, since the entire circumference of the glass wool mat is heated and squeezed over a certain area, uniform hardening can be achieved. As a result,
High-precision cylindrical bodies can be formed without being affected by variations in material thickness or density, and without surface cracks due to restoring force (internal repulsion force). Moreover,
Since the inner and outer circumferential surfaces are formed to be smooth and hard during the molding stage, secondary processing such as polishing is not required, and advantages such as improved yield and shortened working time can be obtained.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5.

In each figure, a mandrel 1 is fixedly supported at one end by a support frame 2, and the other end is a free end. As shown in FIG. 5, the mandrel 1 is hollow and has a large number of holes 3 formed in its free end peripheral wall. For example, a region 1a that is approximately half of one end of the mandrel 1 is non-porous, and a region 1a that is approximately half of the other end of the mandrel 1 is non-porous.
In b, approximately 1/3 region 1b'' in the center has scattered holes 3, and approximately 1/3 region 1b on the other end side has densely packed holes 3. Note that 1b' The area is non-porous.

A hot air passage pipe 4 is provided inside a region 1a of approximately half of one end of the mandrel 1, and the mandrel 1 is
Hot air is arranged to flow inside the other end side 1b. A ring-shaped end wall 7 is provided at the other end of the mandrel 1, and an opening 8 for discharging hot air is formed in the center thereof. Then, hot air supplied from a hot air supply device to be described later into the mandrel 1 through the hot air passage pipe 4 is discharged outward through the hole 3 and the opening 8 in the peripheral wall.

A guide sheet winding means 10 is disposed on the outer periphery of one end of the mandrel 1 for winding up a thin ribbon-shaped heat-resistant guide sheet 9 in a spiral shape and advancing the guide sheet 9 toward the other end of the mandrel 1 . As the guide sheet 9, a sheet made of metal, paper, synthetic resin, etc. is used. Guide sheet winding means 10
These include a means (not shown) for feeding the guide sheet 9 so as to intersect the axis of the mandrel 1 at a predetermined angle, a pulley 11 and a belt that clamp the guide sheet 9 wound around the mandrel 1 from the outer circumferential side and apply rotational force. 12 etc.

The guide sheet 9, which is given a twisting force by the belt 12, is partially overlapped and sent to the other end, that is, the free end, of the mandrel 1 while rotating one after another. Note that the guide sheet 9 may be provided with small holes for passing hot air (not shown).

Adjacent to the guide sheet winding means 10, a belt-shaped material winding means 14 is provided for winding a belt-shaped glass wool mat 13 onto the guide sheet 9 in a spiral manner.

This band-shaped material winding means 14 includes means (not shown) for feeding the glass wool mat 13 so as to cross the axis of the mandrel 1 at a predetermined angle, and a pressing roller 15 for pressing the supplied glass wool mat 13 onto the guide sheet 9. It is assumed that the configuration has the following. The glass wool mat 13 is sequentially pressed and wound onto the guide sheet 9 by the pressing roller 15, and the mat edges overlap each other, and the glass wool mat 13 is sequentially rotated to the other end of the mandrel 1 together with the guide sheet 9. Sent.

The glass wool mat 13 is preformed into a band shape by a rotary gas jet method or other known method, and is in an uncured state when supplied to the mandrel 1.

As shown in FIG.
A roller 16 that heats the glass wool mat 13 from the outer circumferential side is disposed at a position immediately after wrapping. The heating roller 16 has its axis substantially parallel to the axis of the mandrel 1, and performs preliminary curing of the glass wool mat 13. That is, the glass wool mat 13 is heated and pressurized on the outer circumferential side of the overlapped edge of the glass wool mat 13, and the glass wool mat 13 is rolled.
The surface of the (wound body) is flattened and hardened to some extent.

Further, behind the heating roller 16, that is, on the advancing side of the glass wool mat 13, there is a heating furnace 17 that heats the outer peripheral side of the glass wool mat 13 over a certain area, and a throttle that heats and pressurizes the outer peripheral surface of the glass wool mat 13. A member 18 is provided.

The heating furnace 17, as shown in FIGS. 2 to 4,
It is composed of a cylindrical peripheral wall 19 made of a heat insulating material and a collar-shaped end wall 20 connected to both ends thereof, and is designed to surround the glass wool mat 13 in an area extending before and after the free end of the mandrel 1. . A hot air supply pipe 21 and a hot air discharge pipe 22 are provided on the cylindrical peripheral wall 19 and are connected to a hot air supply means 23 .

The hot air supply means 23 includes a blower 25 and a burner 24.
The hot air generated is supplied to a hot air supply pipe 21 of the heating furnace 17 and a branch hot air supply pipe 26 connected to one end of the mandrel 1. 2
Reference numerals 7 and 28 indicate dampers provided in the hot air supply pipes 21 and 26, respectively. Further, 29 indicates a blower driving motor.

The hot air supplied to the mandrel 1 heats the mandrel 1, and also blows out from the holes 3 in the peripheral wall of the mandrel 1 to heat the entire glass wool mat 13 from the inner peripheral side via the guide sheet 9.

Further, the hot air supplied to the heating furnace 17 heats the outer peripheral side of the glass wool mat 13. Heating furnace 1
The hot air that has flowed into the hot air outlet 7 flows back to the hot air supply means 23 via the hot air exhaust pipe 22 .

On the other hand, the aperture member 18 is made of metal, has a cylindrical shape with a smooth inner peripheral surface, and is arranged coaxially with the mandrel 1. It is attached to the end wall 20 of the heating furnace 17 via a bracket 30 and fasteners 31 such as bolts.

The rear half of this throttle member 18 is the heating furnace 17
The front half of the mandrel protrudes toward the front of the heating furnace 17 (toward one end of the mandrel 1). And this aperture member 18
Both ends, that is, the glass wool entrances and exits 32 and 33 are open in the shape of a flap. Although not shown, an electric heating source is connected to the aperture member 18, and the aperture member 1
8 may be actively heated.

A wound body of glass wool mat 13 whose outer peripheral surface has been preliminarily hardened by a heating roller 16 and has become smooth to some extent is inserted into the squeezing member 18, heated and pressurized, and subjected to a squeezing effect. This squeezing action acts on the wound body of the glass wool mat 13 continuously over a certain area in the axial direction and simultaneously in the entire circumferential direction. Moreover, the aperture member 18
are arranged concentrically with the mandrel 1, so that the squeezing action acts uniformly over the entire thickness of the glass wool mat 13. Furthermore, the inner peripheral surface 1 of the aperture member 18
Since the glass wool mat 8 is smooth and heated, the outer peripheral surface of the glass wool mat 13 is uniformly hardened.

As a result, the glass wool mat 13 does not swell due to its internal repulsion force, and its surface irregularities are smoothly corrected, and a good surface hardening finish is applied, and the glass wool mat 13 is sent out from the mandrel 1 and the heating furnace 17.

The cylindrical molded product 13a of the glass wool mat 13 sent out is cut into a predetermined length by a motor 34-driven cutter 35 provided at the outlet.
It becomes a cylindrical product.

The cylindrical product has no cracks or irregularities on the surface, and no gripping dents due to uncured parts occur. Therefore, when used as a heat insulating coating for piping,
It is easy to install, has good adhesion to piping, and has a beautiful appearance.

In the above embodiment, the guide sheet 9 was simply ejected from the free end of the mandrel 1, but as shown in FIG. Efficient sheet operation can be achieved.

A concrete example of actual molding is shown below.

In this molding example, the length of the mandrel is set as follows depending on the diameter of the molded product. 1 to 2 m when the molded product is 100 mmφ or less. 100~300
When mmφ, 2 to 4 m. 4 when 300~700mmφ
~6m.

The non-porous area 1a of the mandrel is 40-60% of the total length,
The other regions 1b', 1b'', and 1b are each 5 to 30% of the total length.

The hot air temperature supplied is 200~300℃, preferably
Adjust the temperature to 230-300℃.

Molding example 1 The outer diameter of the mandrel is 600 mm, the total length is 5.5 m, and each area is 3 m for 1a, 0.5 m for 1b', 1b'' and 1b.
are both 1m. Each wall thickness is 6mm,
3mm, 3mm, 1.6mm, 35 for 1b'' and 1b
Holes of mmφ were drilled with opening ratios of 19% and 30%, respectively.

The length of the heating furnace was 2.5 m, and the free end of the mandrel was aligned with the center of the furnace.

The hot air temperature was 270°C, and the production speed was 1 m/min.

The guide sheet is 0.3mm thick cardboard, 115mm
Two layers of wide ones were used.

A vinyl emulsion based adhesive was used to bond the guide sheets together.

A galvanized steel plate with a thickness of 0.8 mm was used for the drawing member. Its length was 1 m, and it protruded 20 cm from the heating furnace. The inner diameter was 650mmφ.

Glass wool mats are 1150mm wide and have a cotton collection of 180.
g/m ² in 10 layers. The feeding speed is approximately 18m/min. The resin impregnation rate was approximately 11%.

One presser roller with an outer diameter of 200 mmφ and a length of 1500 mm was used.

The heating roller had an outer diameter of 150 mmφ, a length of 500 mm, and a surface temperature of 350°C.

According to the above molding conditions, inner diameter 600 ± 1 mm, outer diameter 650
A material with a thickness of ±2 mm, a wall thickness of 25 ±1 mm, and a density of 64 Kg/m ³ was obtained. This was cut into a length of 2 m.

Molding example 2 The outer diameter of the mandrel is 34mmφ, the total length is 1800mmφ,
Each area is 800 mm for 1a, 200 mm for 1b', and 400 mm for both 1b'' and 1b.The thickness of each area is
2.3mm, 1.3mm, 0.6mm, 0.6mm. And 5
A mmφ hole was drilled with an aperture ratio of 15%.

The length of the heating furnace was 1.2 m, and the free width of the mandrel was aligned with the center of the furnace.

The hot air temperature was 260°C, and the production speed was 0.45 m/min.

The guide sheet is 0.11mm thick kraft paper, 40
Two layers of mm-wide pieces were used.

The adhesive used to bond the guide sheets together was the same as in the previous example.

The drawing member was made of galvanized steel plate with a thickness of 0.6 mm, and its length was 70 cm, protruding 15 cm from the heating furnace. The inner diameter was 84 mm.

Glass wool mat is 240mm wide and has a cotton collection capacity of approximately 220mm.
g/m ² in 10 layers. Note that the supply speed was approximately 2 m/min, and the resin ratio was 6%.

One presser roller with an outer diameter of 30 mmφ and a length of 330 mm was used.

The heating roller had an outer diameter of 30 mmφ, a length of 100 mm, and a surface temperature of 330°C.

According to the above molding conditions, the inner diameter is 34±1mmφ and the outer diameter is 84mm.
A material with a diameter of ±1 mm, a wall thickness of 25 ±1 mm, and a density of 53 Kg/m ³ was obtained. This was cut into a length of 1 m.

Results In both construction examples 1 and 2 above, molded products with smooth outer surfaces and high dimensional accuracy were obtained.

Ears molded from glass wool mat material can also be used, making it possible to omit sources.

[Effects] As detailed above, according to the present invention, by providing the cylindrical drawing member, the entire circumference of the glass wool mat can be uniformly hardened, and the material density and thickness can be uniformly cured. A hard, smooth and beautiful cylindrical molded product can be easily obtained without being affected by variations in thickness. Furthermore, there is also an effect that raw materials are not wasted during molding.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is an overall configuration diagram, FIG. 2 is an enlarged sectional view of the heating furnace section, FIG. 3 is a sectional view taken along the - line in FIG. 2, FIG. 4 is an enlarged sectional view of the aperture member, FIG. 5 is an enlarged view of the mandrel, and FIG. 6 is a partial view showing another embodiment of the present invention. 1... Mandrel, 3... Hole, 9... Guide sheet, 10... Guide sheet winding means, 13...
Glass wool mat, 14... Band-shaped material winding means, 17... Heating furnace, 18... Squeezing member, 23...
...Hot air supply means.

Claims (1)

[Scope of Claims] 1. A hollow mandrel having a peripheral wall with a large number of holes, and a guide sheet winding means for spirally winding a thin strip-shaped heat-resistant guide sheet onto the mandrel and advancing the same in one direction; A band-shaped material winding means for polymerizing and spirally winding a band-shaped glass wool mat on the guide sheet and advancing the same in one direction; A heating furnace for heating, a hot air supply means for supplying hot air into the mandrel, and a glass wool mat having a cylindrical shape with a smooth inner peripheral surface, located near the heating furnace, surrounding the mandrel, and passing through. 1. An apparatus for forming a glass wool cylindrical body, comprising: a drawing member for pressurizing the outer circumferential surface of the glass wool cylindrical body. 2. The apparatus for forming a glass wool cylindrical body according to claim 1, wherein the aperture member is arranged coaxially with respect to the mandrel, and the glass wool mat inlet portion is opened in the shape of a flap. 3. The glass wool cylindrical body forming apparatus according to claim 1, wherein at least a part of the drawing member is inserted into the heating furnace. 4. The apparatus for forming a glass wool cylindrical body according to claim 1, wherein the aperture member is heated by an electric heating source. 5. The apparatus for forming a glass wool cylindrical body according to claim 1, wherein the holes of the mandrel are mainly formed on the advancing end side of the glass wool mat. 6. The apparatus for forming a glass wool cylindrical body according to claim 5, wherein the holes in the mandrel gradually increase toward the advancing end of the glass wool mat.