JP3224592B2 - Manufacturing method, manufacturing apparatus and cylindrical heat insulating material for cylindrical heat insulating material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a tubular heat insulating material for keeping a tubular body such as a copper tube used for a cooler or the like warm.

[0002]

2. Description of the Related Art As a tubular heat insulating material for keeping a tubular body such as a copper tube used for a cooler or the like warm, as shown in FIG. The coated tubular heat insulating material 40 and the like are used. As shown in FIG. 7, the cylindrical heat insulating material 40 is
Is pulled out by a take-off machine 5, passed through a coating mold 6, and wound around a sheet-like foam 2 heated by a heater 7, so that a side edge 13 of the sheet-like foam 2
The coated tubular foams 3 are formed by heat fusion with each other, and then are taken up by the two grooved belts 8 and 9 of the take-up machine 5 while maintaining the shape thereof. After the multiple side walls are heat-sealed and pair-processed,
It was manufactured by a method such as winding with a winder 10.

[0003]

[Problems to be solved by the invention]

However, the groove shape of two grooved belts 8, 9 of the pull winding machine 5, as shown in FIG. 11, in a semicircular cross section, r = R (where r = radius of the grooved belt groove, R = radius of the cylindrical heat insulating material).
There was a drawback that the coated tubular foam 3 could not be pressed and taken over the product outer diameter of 0 or more. For this reason, as shown in FIG. 8, the side edges 13 of the sheet-like foam 2 cannot be sufficiently pressed and fused to each other.
As shown in (1), the side edge portion 13 of the sheet-like foam 2 that was not sufficiently fused was separated, and a seal crack 14 was sometimes generated in the tubular heat insulating material 40.

[0005]

According to the first and second aspects of the present invention, the side edges of the covering sheet constituting the outer layer of the cylindrical heat insulating material can be sufficiently fused, and the seal crack of the cylindrical heat insulating material is prevented. It is an object of the present invention to provide a method and an apparatus for manufacturing a tubular heat insulating material that can be manufactured.

A third object of the present invention is to provide a tubular heat insulating material suitable for keeping a tubular body such as a copper tube used for a cooler or the like warm.

[0008]

[Means for Solving the Problems]

In the method for producing a tubular heat insulating material according to the first aspect of the present invention, a tubular foam is transferred to a coating mold, and the outer periphery of the tubular foam is coated with a coating sheet in the coating mold. Thereafter, in a method of manufacturing a tubular heat insulating material in which the coated tubular foam is sandwiched between two grooved belts and pulled, the grooved sheet is positioned so that the side edge of the coated sheet is positioned at the center of one of the grooved belts. The method is characterized in that the interval between the central portions of the belt is set to be equal to or less than the diameter of the tubular heat insulating material, and the coated tubular foam is taken off.

[0010]

[0011]

[0012] A second aspect of the present invention, an apparatus for manufacturing a tubular heat insulating material, comprises a feeding section of a tubular foam, a feeding section of a covering sheet, a coating mold, and two grooved belts. In the manufacturing apparatus for a tubular heat insulating material provided with a take-up machine, the groove portions of the two grooved belts have a semicircular cross section with a radius r> R, and the center of the two grooved belts at the time of take-up. H <
2R. Where r = radius of the groove R = radius of the cylindrical heat insulator H = interval between the central parts of the two grooved belts at take-off

[0013] tubular insulation third aspect of the present invention is characterized in that it is Seise by the method of claim 1 Symbol placement of tubular insulation.

As the tubular foam, for example, a tubular non-crosslinked polyethylene foam can be suitably used, and as the covering sheet, a crosslinked polyethylene foam sheet can be suitably used.

[0015]

[Action]

In the first invention, the distance between the center portions of the grooved belts is set to be equal to or less than the diameter of the cylindrical heat insulating material so that the side edge of the cover sheet is positioned at the center of one of the grooved belts. By taking off the foam, the side edges of the covering sheet are strongly pressed and taken off. As a result, the side edges of the covering sheet are tightly adhered to each other, and no seal crack occurs.

[0017]

[0018]

In the second invention, since the groove portions of the two grooved belts of the take-up machine have a semicircular cross-section with a radius r> R, the coated tubular foam to be taken-off and the grooved belt are formed. Since the distance from the groove is the narrowest at the center of the groove of the grooved belt and the distance between the centers of the two grooved belts at the time of take-off is H <2R, the covering tubular foam is formed. The body can be pulled out more than the outer diameter of the tubular heat insulating material, and the central portion of the coated tubular foam is pressed particularly strongly.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments. 1 to 5 are views showing an example of a method and an apparatus for manufacturing a tubular heat insulating material of the present invention. FIG. 1 is a front view of an example of a method and an apparatus for manufacturing a tubular heat insulating material of the present invention. Reference numeral 4 denotes an extension frame on which the tubular foam 1 is set;
Is a feeding frame on which the sheet-like foam 2 of the covering sheet is set, and constitutes a feeding portion 15 of the tubular foam 1 and a feeding portion 18 of the sheet-like foam 2, respectively. 6 is fed out from the feed-out portion 18 on the outer periphery of the tubular foam 1 and has a heater 7.
This is a coating mold for coating the sheet-like foam 2 heated by the method. Reference numeral 16 denotes a cylindrical foam 1 provided between the feeding portion 15 of the cylindrical foam 1 and the coating mold 6 and forming a slack state 27 in the cylindrical foam 1 transferred to the coating mold 6.
The transfer unit. Reference numeral 34 denotes a take-up machine including an upper grooved belt 32 and a lower grooved belt 33, and reference numeral 10 denotes a take-up machine that winds the coated tubular foam 3. Reference numeral 19 denotes a pair processing apparatus for forming two sets of the coated tubular foams 3 manufactured in two series.
The pair processing device 19 may be omitted when not performing pair processing. 41 is a guide for the tubular foam 1;
Is a holding device for the upper part of the coated tubular foam 3.

FIG. 2 is a front view of a transfer section of the tubular foam, and FIG. 3 is a perspective view of a main part of the transfer section. Reference numeral 20 denotes a motor for driving the pair of rolls 21 and 22, the rotation speed of which is controlled by an output signal of the sensor 23. Reference numeral 25 denotes a gantry attached to a support 26, and a contact lever 28 and a sensor 23 are attached to the gantry 25. Sensor 23
May be attached to any position other than the gantry 25. The contact lever 28 is a rod-shaped body formed in a U-shape, and swings on the gantry 25 so as to contact the upper part of the tubular foam 1 and swing in accordance with the vertical movement of the tubular foam 1. The sensor 23 is movably mounted, and is mounted so as to detect the upper limit of the vertical movement of the tubular foam 1.

The contact lever 28 and the sensor 23 constitute a detecting means for detecting the slack state of the tubular foam 1, and the detecting means, the control means 24, the motor 20, the pair of rolls 2
The transfer section 16 of the tubular foam 1 is constituted by 1 and 22.

Although a sensor for detecting the lower limit of the tubular foam 1 may be provided, the sensor 23 for detecting the upper limit alone may be practically used to control the slack state 27 of the tubular foam 1. 29 is a roll 21 that can be moved up and down by a handle 31
30 is a roller 2 driven by the motor 20
No. 2 bearing.

Next, a method for manufacturing a tubular heat insulating material by the above-described apparatus for manufacturing a tubular heat insulating material will be described. The tubular foam 1 set on the feeding frame 4 is transferred by the transfer unit 16 to the coating mold 6 and the transfer unit 1.
6 and transferred to the coating mold 6 so as to form a slack state 27. When an excessive tensile force acts between the transfer unit 16 and the coating mold 6, the tubular foam 1 moves upward, and the contact lever 28 that is in contact with the tubular foam 1 detects the sensor 23. And the motor 20 is controlled by the detection output signal of the sensor 23 to increase the rotation speed of the roll 22. As a result, the transfer speed of the tubular foam 1 is increased, a required slack state 27 is formed between the coating mold 6 and the transfer section 16, and the excessive tensile force acting on the tubular foam 1 is eliminated. And fluctuations in tensile force are eliminated,
The outer diameter of the tubular foam 1 transferred to the coating mold 6 does not fluctuate, and the outer diameter of the tubular foam 1 does not decrease.

Next, the feeding platform 17 is moved by the coating mold 6.
From the sheet-like foam 2 heated by the heater 7
The outer peripheral portion of the tubular foam 1 is covered with the outer peripheral portion of the tubular foam 1 so that the side edge portion 13 is located at the upper central portion (or lower central portion) of the covering mold 6 to form the coated tubular foam 3. It is taken up by a take-up machine 34 composed of a lower grooved belt 33, and is pair-processed into a pair of coated tubular foams manufactured in another series and a pair of eyeglass-like tubular heat insulating materials by a pair processing device 19, and is wound up. 10
To take up. When the pair processing is not performed, the sheet is taken up by the take-up machine 34 and then wound up on the take-up machine 10 as it is.

FIGS. 4 and 5 show an example of a belt with upper and lower grooves, which can be used in the method and apparatus for manufacturing a tubular heat insulating material of the present invention. FIG. 4 is a cross-sectional view of an example of an upper and lower grooved belt, and FIG. 5 is a cross-sectional view showing a state when the coated tubular foam is taken off. Reference numerals 36 and 37 denote grooves of the upper and lower grooved belts 32 and 33, respectively. In this example, the radius R of the cylindrical heat insulating material 40 in which the sheet foam 2 is coated on the outer periphery of the manufactured cylindrical foam 1 is 12 mm. Therefore, the radius r of the grooves 32 and 33 is 1 so that r> R.
It is 2.5 mm. The coated tubular foam 3 is provided with a space H between the central portions 38, 39 of the upper and lower grooved belts 32, 33,
At the time of taking off, the outer diameter of the cylindrical heat insulating material 40 is 24 mm or less.
mm. At this time, the groove 3
Since the radius r of r> 2,33 is r> R, the grooves 32,33
When press-fitting the coated tubular foam 3, first, the central portion 38,
39 comes into contact, and the other parts do not come into contact with each other, and the other parts come into contact sequentially as the crimping proceeds. Therefore, the coated tubular foam 3 can be pressed against the outer diameter of the tubular heat insulating material 40 or more, and the central portion of the covered tubular foam 3 can be strongly pressed. Thereby, the side edge portion 13 of the sheet-like foam 2 constituting the outer layer of the coated tubular foam 3 located at the upper central portion (or the lower central portion) can be strongly pressed. As a result, the side edges 13 of the sheet-like foam 2 are tightly adhered to each other, and the seal cracking failure of the tubular heat insulating material 40 is eliminated.

FIG. 6 is a cross-sectional view of an example of a tubular heat insulating material produced by the method or apparatus for producing a tubular heat insulating material of the present invention. The tubular heat insulating material 40 is composed of a tubular foam 1 made of a non-crosslinked polyethylene high foam of an inner layer, and a sheet foam 2 made of a crosslinked polyethylene high foam of an outer layer. The part 13 is tightly adhered. In this example, no pair processing device is used.

[0028]

【The invention's effect】

According to the first invention, the interval between the center portions of the grooved belts is set to be equal to or less than the diameter of the cylindrical heat insulating material so that the side edge of the covering sheet is positioned at the center of one of the grooved belts. By pulling the coated tubular foam, the side edges of the coated sheet can be strongly pressed and pulled, so that the side edges of the coated sheet can be tightly adhered to each other. Seal cracking failure can be prevented.

[0030]

[0031]

According to the second invention, the grooves of two grooved belts take-off machines, by being a semicircular cross section of radius r> R, coated tubular foam the grooved take-off is Since the distance between the belt and the groove is the narrowest at the center of the groove of the grooved belt, and the distance between the centers of the two grooved belts at the time of take-off is H <2R, the covering cylindrical shape is obtained. The foam can be taken out by pressing the foam more than the outer diameter of the tubular heat insulating material and the central portion of the coated tubular foam particularly strongly.

In the cylindrical heat insulating material according to the third aspect of the present invention, the inner layer tubular foam and the coated cover sheet may have poor inner surface adhesion and / or
Also, it has no seal cracking failure and is suitable for keeping a tubular body such as a copper tube used for a cooler or the like warm.

[Brief description of the drawings]

FIG. 1 is a front view of an example of a method and an apparatus for manufacturing a tubular heat insulating material of the present invention.

FIG. 2 is a front view of a transfer section of the tubular foam.

FIG. 3 is a perspective view of a main part of a transfer unit.

FIG. 4 is a cross-sectional view of an example of two grooved belts that can be used in the method and the apparatus for manufacturing a tubular heat insulating material of the present invention.

FIG. 5 is a cross-sectional view showing a state when the coated tubular foam is taken off.

FIG. 6 is a sectional view of a tubular heat insulating material.

FIG. 7 is a front view of a conventional apparatus for manufacturing a tubular heat insulating material.

FIG. 8 is a sectional view of a conventional tubular heat insulating material.

FIG. 9 is a perspective view showing a state in which the outer diameter of the tubular foam is reduced.

FIG. 10 is a perspective view showing a state of poor inner surface adhesion of the coated tubular foam.

FIG. 11 is a cross-sectional view showing a state when the coated tubular foam is taken off.

FIG. 12 is a perspective view showing a state where a seal breakage of the tubular heat insulating material occurs.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical foam 2 Sheet-like foam 3 Coated cylindrical foam 4,17 Feeding stand 5,34 Take-off machine 6 Coating mold 7 Heater 8,9 Grooved belt 10 Winding machine 11 Outside diameter reduction part 12 Cavity DESCRIPTION OF SYMBOLS 13 Side edge part 14 Seal break 15, 18 Feeding part 16 Transfer part 19 Pair processing apparatus 20 Motor 21, 22 Roll 23 Sensor 25 Mount 26 Support | pillar 27 Slack state 28 Contact lever 32 Upper groove belt 33 Lower groove belt 36, 37 Groove part 38 , 39 Central part 40 Cylindrical insulation

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 63/00-63/48 B32B 1/00-35/00 F16L 59/147

Claims (3)

(57) [Claims] 1. A tubular foam is transferred to a coating mold, and in this coating mold, an outer periphery of the tubular foam is coated with a covering sheet, and then the coated tubular foam is formed into two grooved belts. In the method for manufacturing a tubular heat insulating material that is sandwiched and pulled, so that the side edge of the covering sheet is positioned at the center of one grooved belt,
A method for producing a tubular heat insulating material, wherein the interval between the central portions of the grooved belt is set to be equal to or less than the diameter of the cylindrical heat insulating material, and the coated tubular foam is taken off. 2. A manufacturing apparatus for a tubular heat insulating material, comprising: a delivery section of a tubular foam, a delivery section of a covering sheet, a coating mold, and a take-off machine including two grooved belts. The groove portions of the two grooved belts have a semicircular cross section with a radius r> R, and the interval between the central portions of the two grooved belts at the time of take-off is H <2R. Manufacturing apparatus for cylindrical heat insulating material. Where r = radius of the groove R = radius of the cylindrical heat insulator H = interval between the central parts of the two grooved belts at take-off 3. A tubular heat insulating material, characterized in that it is Seise by the method of claim 1 Symbol placement of tubular insulation.