JPS61202828A - Molding device for glass wool cylindrical material - Google Patents

Abstract

PURPOSE:To contrive an improvement in accuracy by making the titled cylindrical material cure uniformly, by providing a cylindrical narrowing component heating and pressuring the external circumferential surface and having a smooth internal circumferential surface in the vicinity of a heating furnace. CONSTITUTION:A heating furnace 17 heating an external circumferential side of a glass wool mat 13 extending over a fixed sphere of the same and a narrowing component 18 are arranged on the back of a heating roller 16. This narrowing action acts upon a wound material of the glass wool mat 13 extending over a fixed sphere in an axial direction continuously and over the whole sphere in a circumferential direction at a time. As, moreover, the narrowing component 18 is arranged concentrically with a mandrel 1, the narrowing action acts uniformly upon a mat 13 extending over the whole depth of the same. In addition to the above, as an internal circumferential surface of the narrowing component 18 is smooth and is under a heating state, an external circumferential surface receives curing action uniformly. In consequence of the above, favorable surface hardening finish is applied to the mat 13 which is sent out through the mandrel 1 and heating furnace 17.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a glass wool cylindrical body forming apparatus for forming a glass wool cylindrical body from a band-shaped glass wool mat.
In particular, the present invention relates to a glass wool cylindrical molding device with improved hardening treatment means.

[Conventional technology]

For example, as a device for forming and manufacturing glass wool cylindrical bodies that are used as heat-insulating coatings for air-conditioning equipment piping, etc., an uncured strip-shaped glass wool mat (hereinafter also referred to as "band-shaped material") is rolled up into a spiral shape. There is an apparatus that continuously forms a material by heating and pressurizing it.

Conventionally, as such glass wool cylindrical body forming equipment,
As shown in Japanese Patent Application Laid-open No. 59-87130, a mandrel with a large number of holes bored in the peripheral wall and a guide sheet in which a thin strip-shaped heat-resistant guide sheet is wound up in a spiral shape on the mandrel and the guide sheet advances in one direction. A winding means, a strip material winding means for polymerizing and spirally wrapping the strip material on a guide sheet and advancing the strip material in one direction, and a heating roller that heats and presses the wrapped strip material from the outer circumferential side. and,
Some devices are equipped with 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 peripheral surface is pressed against the band-shaped material to heat and pressurize it. 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] The band-shaped material (glass wool mat) supplied to such a cylindrical body forming device has variations in thickness and density, so the pressing force from the heated roller does not necessarily act uniformly. Moreover, 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 the restoring force of the internal uncured portion may cause a bulge. 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, ease of mating when heat-insulating coating of piping, etc.
In recent years, improvements in adhesion, appearance, etc. have been desired, and it has become difficult to obtain satisfactory molded products using conventional equipment.

It is also possible to polish the surface of the molded product, but
There are also disadvantages such as waste of shavings and an increase in the number of steps.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention improves the curing means in the conventional cylindrical body forming apparatus, and includes a band-shaped glass wool mer 21 wound around a mandrel. When passing the glass wool mat through a heating furnace, a cylindrical aperture member with a smooth inner circumferential surface that heats and pressurizes the outer circumferential surface of the glass wool mat is provided near the heating furnace.

[Function] In the present invention, since the entire periphery of the glass wool mat is heated and squeezed over a certain area, uniform hardening can be achieved. As a result, a highly precise cylindrical body can be molded 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.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In each figure, a mandrel 1 has one end fixedly supported by a support frame 2, and the other end is a free end. This mandrel 1
As shown in FIG. 5, the mandrel is hollow and has a large number of holes 3 in its free end peripheral wall.For example, the half area 1a of the side channel at one end of the mandrel l is non-porous. , among the regions 1b on the other end half, the central region tb'' has holes 3 in the form of scattered dots, and the region 1b'' on the other end side has holes 3 in a dense manner. Note that the region lb' is non-porous.

A hot air passage pipe 4 is provided inside a region 1a of a side path half of one end of the mandrel 1, and hot air flows into the other end side 1b of the mandrel 1 from a hole 6 of a partition wall 5 installed in the middle part of the mandrel 1. A ring-shaped end wall 7 is provided at the other end of the mandrel l, and an opening 8 for discharging hot air is formed in the center of the ring-shaped end wall 7. Then, hot air supplied from a hot air supply device to be described later into the mandrel 1 via a hot air passage pipe 4 is discharged outward through holes 3 and openings 8 in one circumferential 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 strip-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. The guide sheet winding means 10 includes means (not shown) for supplying the guide sheet 9 so as to intersect the axis of the mandrel 1 at a predetermined angle, and a means (not shown) for supplying the guide sheet 9 so as to intersect the axis of the mandrel 1 at a predetermined angle. It is composed of a pulley 11, a belt 12, etc., which provide the following.

The guide sheet 9, which is given a twisting force by the bell 12, is partially overlapped and sent to the other end of the mandrel l, that is, to the free end side, 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, there is provided a band-shaped material lateral application means 14 for superimposing and spirally winding the band-shaped glass wool mat 13 onto the guide sheet 9.

This band-shaped material wrapping means 14 is made of glass wool pine) 13
The structure includes a means (not shown) for supplying the glass wool pine so as to intersect the axis of the mandrel 1 at a predetermined angle, and a pressing roller 15 for pressing the supplied glass wool pine 13 onto the guide sheet 9. The glass wool mat 13 is sequentially pressed and wound onto the guide sheet 9 by the pressing roller 15, and the mat edges are overlapped with each other, and the glass wool mat 13 is sent to the other end of the mandrel 1 together with the guide sheet 9 while rotating one after another. .

The glass wool mat 13 is preformed into a band shape using a rotary gas jet method or other known method.
When it is supplied to the mandrel I, it is in an uncured state.

As shown in FIG. 1, a roller 16 that heats the glass wool mat 13 from the outer circumferential side is disposed immediately after the glass wool mat 13 is wound. The axis of this heating roller 16 is approximately parallel to the axis of the mandrel 1,
The glass wool mat 13 is pre-cured, that is, the raised portion of the outer peripheral side of the overlapping edge of the glass wool mat 13 is heated and pressurized, and the glass wool mat 13 is rolled one time.
The surface of the (wound body) is flattened and hardened to some extent.

In addition, 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 circumferential side of the glass wool mat 13 over a certain area, and a heating furnace 17 that heats and heats the outer circumferential surface of the glass wool mat 13. Squeezing member 1
8 are arranged.

As shown in FIGS. 2 to 4, the heating furnace 17 includes a cylindrical peripheral wall 19 made of a heat insulating material, and brim-shaped end walls 2 connected to both ends of the cylindrical peripheral wall 19.
A cylindrical peripheral wall 19 is provided with a hot air supply pipe 21 and a hot air discharge pipe 22, and is configured to surround the glass wool pine (glass wool pine) 13 in an area extending before and after the free end of the mandrel l. It is connected to means 23.

The hot air supply means 23 is configured such that the blower 25 supplies hot air generated by the burner 24 to the hot air supply pipe 21 of the heating furnace 17 and the branched hot air supply pipe 26 connected to one end of the mandrel 1.

Reference numerals 27 and 28 indicate dampers provided in each of the hot air supply pipes 21 and 26, and 29 indicates a blower driving motor.

The hot air supplied to the mandrel 1 heats the mandrel 1, blows out from the hole 3 in the peripheral wall of the mandrel 1, and passes through the guide sheet 9 to the glass wool pine) 1.
3. Heat the whole from the inner circumference side.

Further, the hot air supplied to the heating furnace 17 heats the outer peripheral side of the glass wool mat 13. The hot air that has flowed into the heating furnace 17 is returned 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 l. It is attached to the end wall 20 of the heating furnace 17 via a bracket 30 and fasteners 31 such as bolts.

This aperture member! 8, the latter half is inserted into the heating furnace 17 to be heated, and the front half is inserted into the heating furnace 1.
7 (one end side of the mandrel l). Both ends of this diaphragm member 18, that is, the glass wool inlets and outlets 32 and 33 are opened in a trumpet shape. Although not shown, an electric heating source may be connected to the aperture member 1B to actively heat the aperture member 18.

A wound glass wool mat 13 whose outer 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 is caused by the glass wool mat 1
It acts on the wound body No. 3 continuously over a certain area in the axial direction and simultaneously in the entire circumferential direction. Moreover, since the aperture member 18 is arranged concentrically with the mandrel l,
The squeezing action acts uniformly over the entire thickness of the glass wool mat 13. Furthermore, since the inner circumferential surface 18 of the squeezing member 18 is smooth and heated, the outer circumferential surface of the glass wool mat 13 is uniformly subjected to the curing action.

As a result, the glass wool mat 13 does not swell due to its internal repulsion force, and the 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 l and the heating furnace 17.

Cylindrical molded product 13a of the delivered glass wool mat 13
is cut into a predetermined length by a motor 34-driven cutter 35 or the like provided at the exit portion, resulting in 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 can be easily installed, has good adhesion to the piping, and has a beautiful appearance.

In the above embodiment, the guide sheet 9 was simply released from the free end of the mandrel l, but as shown in FIG. By passing the guide sheet through the inside and returning it to the guide sheet winding means, the guide sheet can be operated efficiently.

An actual molding example will be specifically 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.

Zoo ~300mmφ, 2~4m, 300~7
00 mmφ, 4 to 6 m @ The non-porous area 1a of the mandrel is 40 to 60% of the total length, and the other areas 1b', l
b" and lb" are each 5 to 30% of the total length.

The temperature of the hot air supplied is 200 to 300°C, preferably 23°C.
Adjust the temperature to 0 to 300°C.

Molding Example 1 The outer diameter of the mandrel was 600 mm, the total length was 5.5 m, and each area had a la of 3 m and an lb'' of 0.5 m.

! b'' and lb'' were both 1 m. What is the thickness of each wall?

8mm, 3mm, 3mm, and 1.8mm, respectively, and l
b" and lb" have holes of 35 mmφ each with an aperture ratio of 1.
Perforations were made in 9% and 30%.

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 and has a length of 115m.
Two layers of m width were used.

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

A 0.8 mm thick galvanized steel plate was used as the aperture member. Its length was 1.5 inches, and it was made to protrude 20 cm from the heating furnace.

The inner diameter was 650 mmφ.

The glass wool mat has a width of 1150mm and a collection amount of 180mm.
g/rrf was supplied in 10 layers.

The feeding speed was about 18 m/min, and the resin impregnation rate was about 11%.

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

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

According to the above molding conditions, the inner diameter is 600±Inm and the outer diameter is 650mm.
±2 mm, wall thickness 25±1 mm, and density 64 Kg/rn" 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 has la of 800 mm, lb' of 200 mm,
Both lb''' and lb'' were 400 mm. The wall thickness is 2, 3mm, 1, 3mm, and 0.6m respectively.
m, 0.8 mm. and.

A hole of 5 mmφ was drilled with an aperture ratio of 15%.

The length of the heating furnace was 1.2 m, and the free end 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 made of kraft paper with a thickness of 0.11 mm, and is made of 40
Two calendars with a width of mm were used.

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

A 0.6 mm thick galvanized steel plate was used as the aperture member, and its length was 70 cm, and it was made to protrude 15 cm from the heating furnace. The inner diameter was 84 mm.

Glass wool mat is 240mm 1l! , cotton collection quantity 2
Ten layers of 20 g/rrf were supplied.

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 mm and a length of 330 mm was used.

The heating roller has an outer diameter of 30 mmφ and a length of Zo.

mm, and the surface temperature was 330°C.

According to the above molding conditions, the inner diameter is 34±1mmφ and the outer diameter is 84±
innφ, wall thickness 25±1mm, density 53K g/m
This was cut into a length of In.

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

The ears made of glass wool mat material can also be used, saving resources.

[Effects] As detailed above, according to the present invention, by providing the cylindrical drawing member, it is possible to uniformly harden the entire circumference of the glass wool mat and throughout the interior, thereby reducing material density and thickness. A hard, smooth and beautiful cylindrical molded product can be easily obtained without being affected by variations in thickness. Also,
Another advantageous effect is that the X material is not wasted during molding.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being an overall configuration diagram, Figure 2 being an enlarged sectional view of the heating furnace section, and Figure 3 being a disconnection on the ■-■ line in Figure 2. Section number 4 is an enlarged sectional view of the drawing member part, FIG. 5 is an enlarged view of the mandrel, and FIG. 6 is a partial view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 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, 1g... Squeezing member. 23...Hot air supply means.

Claims (6)

[Claims] (1) A hollow mandrel with many holes drilled in the surrounding wall,
A guide sheet winding means for winding a thin strip-shaped heat-resistant guide sheet around the mandrel in a spiral shape and advancing the same in one direction; a heating furnace that heats the outer peripheral side of the wrapped band-shaped glass wool mat over a certain area in the traveling direction; a hot air supply means that supplies hot air into the mandrel; A glass wool cylindrical body having a cylindrical shape with a smooth surface and comprising a throttle member that is located near the heating furnace to surround the mandrel and pressurizes the outer circumferential surface of the glass wool mat that passes through it. molding equipment. (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 a trumpet shape. (3) The apparatus for forming a glass wool cylindrical body according to claim 1, wherein at least a portion 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.