JP4863573B2 - Equipment for manufacturing foam plastic cylinders - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for manufacturing a foamed plastic cylindrical body that forms a cylindrical heat insulating cover by rolling a foamed plastic sheet.
[0002]
[Prior art]
A cylindrical body made of foamed plastic such as polyethylene foam is widely used as a heat insulating cover or the like that covers a surface of a cold water pipe or an air conditioner refrigerant circulation pipe. One method for producing the foamed plastic cylindrical body is to process a strip-shaped sheet obtained by cutting a foamed plastic sheet into a strip having a certain width. For example, as shown in FIG. 5, the belt-like sheet a is rounded while being softened by heating with hot air blown from the blow-out port b, and thereafter, both side edges of the rounded belt-like sheet a are melted by the fusion heater d, This is led to a mold c to form a cylindrical body.
[0003]
[Problems to be solved by the invention]
However, in the manufacturing apparatus, since the hot air blown out from the outlet b hits the inner bottom surface of the belt-like sheet a, the entire belt-like sheet is not heated uniformly. As a result, as shown in FIG. The cross-section of the slab had a problem that it was deformed into a triangular mussel shape. In such a shape, it was difficult to adhere to the surface of the pipe, and there was a problem that the product value was impaired.
[0004]
The present invention solves the above-described problems, and an object of the present invention is to provide an apparatus for producing a foamed plastic cylinder capable of producing a cylinder as close to a perfect circle as possible.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the gist of the invention described in claim 1 is that a U-shaped curved recess is formed, and the inner wall of the recess is passed through the lower surface of the foamed plastic belt-like sheet. A guide body that curves the belt-like sheet into a U-shaped sheet having a U-shaped cross section, and a bottomed cylindrical body that is disposed on the inner side of the U-shaped sheet at a downstream position of the guide body and in the longitudinal direction of the cylinder plurality and to match the travel direction of the U-shaped sheet, the further peripheral surface of the bottomed cylindrical member, the upper surface portion leaving a mound air inlet consists slits cut in the circumferential direction in a C-shape The hot air blown from the uppermost point of the slit is set so as to reach the vicinity of the upper edge of the U-shaped sheet so that the hot air blows out toward the inner surface of the U-shaped sheet. Soften the U-shaped sheet A hot air blowing header that removes elastic strain generated by bending deformation, a fusion heater that melts both side edges of the U-shaped sheet at a downstream position of the hot air blowing header, and a cylinder at a downstream position of the fusion heater Forming an inner wall, passing both side edges of the U-shaped sheet so as to be heat-sealed, and forming the U-shaped sheet into a cylindrical body, and introduced into the guide body Production of a cylindrical body made of foamed plastic, characterized in that a belt-like sheet in a flat state advances at a constant speed and is molded into a cylindrical body by passing through the hot air blowing header, the fusion heater, and the molding die In the device.
[0006]
As in the first aspect of the invention, a guide body that curves the belt-like sheet into a U-shaped sheet in advance, and a hot air blowing header that blows hot air toward the inner surface of the U-shaped sheet at a downstream position of the guide body; Is provided, it is surrounded by the U-shaped sheet and the hot air can efficiently hit the inner surface of the U-shaped sheet and heat it. Then, on the peripheral surface hot air blowing header is in a bottomed circular cylindrical body, mound when the outlet port of multiple distributed so by opening該墳outlet port so as hot air blown toward an inner surface of the U-shaped sheet, The U-shaped sheet can be heated evenly. The above-mentioned problem of deforming into a triangular mussel shape associated with conventional non-uniform heating is eliminated. If hot air is blown into the curved U-shaped sheet, a part of the hot air in the U-shaped sheet can be stored in the U-shaped sheet and can be entrained in a later forming mold. Molding proceeds smoothly.
Hot air blowing header, the peripheral surface of the bottomed circular cylindrical body allowed and match the travel direction of the cylinder longitudinal direction the U-shaped sheet, further bottomed circular cylindrical body, the upper surface portion, leaving a circle A plurality of aeration openings made up of slits that are cut out in a C shape in the circumferential direction are opened and the hot air blown from the uppermost point of the slit is set so as to reach the vicinity of the upper edge of the U-shaped sheet. If so blown hot air toward the inner surface of the U-shaped sheet from the mound outlet port, it is possible to remove elastic strain generated in the curved and deformed to soften the U-shaped sheet. By softening the U-shaped sheet and removing the elastic strain generated by the curved deformation, the U-shaped sheet can be prevented from being elastically restored and returned to the belt-shaped sheet. On the other hand, since the belt-like sheet in a flat state introduced into the guide body proceeds at a constant speed and is processed into a cylindrical body by passing through the hot air blowing header, the fusion heater, and the forming die. The outer shape of the U-shaped sheet cannot be deformed and contracted simply by removing the elastic strain.
Furthermore, the hot air out header in the bottomed cylindrical body, and when the slit forming the mounds outlet port in the circumferential direction of the hot air blowing header, the distance between the mound outlet port and the U-shaped sheet inner surface at all points The U-shaped sheet that progresses in the molding process can cross the hot air blown out from the slit, so that uniform heating to the U-shaped sheet is further improved.
If the aeration port is a slit that is cut out in a C shape in the circumferential direction of the hot air blowing header, and a plurality of slits are provided in the advancing direction of the U-shaped sheet, the hot air from the aeration port can be used without waste. It can be spread evenly over the entire surface of the character sheet. The U-shaped sheet in a softened state that is heated evenly by the hot air blowing header is guided into a forming die in a state of retaining heat throughout the entire sheet, so that the cylindrical body is close to a perfect circle. To be molded.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the manufacturing apparatus of the foamed plastic cylindrical body according to the present invention will be described in detail. 1 to 4 show one embodiment of a manufacturing apparatus for a foamed plastic cylindrical body according to the present invention. FIG. 1 is a perspective view showing a main part of the manufacturing apparatus, FIG. 2 is a longitudinal sectional view of FIG. FIG. 4 is an AA arrow view of FIG. 2, and FIG. 4 is an enlarged front view of the hot air outlet header.
[0008]
The foamed plastic cylinder manufacturing apparatus includes a guide body 2, a hot air blowing header 6, a fusion heater 8, and a mold 3. The guide body 2, the hot air blowing header 6, and the fusion heater 8 are arranged substantially in a line and sequentially arranged at predetermined intervals from the feeding side of the belt-shaped sheet 1 as the raw material to the mold 3 for forming the cylindrical body 9. (FIGS. 1 and 2). The belt-like sheet 1 in a flat state introduced into the guide body 2 advances in the direction of the arrow in FIG. 1 at a constant speed and passes through the hot air blowing header 6, the fusion heater 8, and the molding die 3, thereby forming a cylindrical body that is the final shape. It will be molded into 9.
[0009]
The guide body 2 is a guide that abuts the lower surface 11 of the belt-like sheet 1 and curves the belt-like sheet 1 in a flat plate state into a U-shaped cross section with respect to the traveling direction. The guide body 2 of this embodiment forms a U-shaped (including semicircular) curved recess 2a by bending a rectangular plate into a U-shape. When the curved surface of the recess 2a is directed upward and the inner wall 21 of the recess 2a passes through the lower surface 11 of the horizontally progressing strip-shaped sheet 1 made of foamed plastic, the strip-shaped sheet 1 is shown in FIG. Thus, the U-shaped sheet 1a having a substantially U-shaped cross section in the longitudinal direction (including a semicircle) is rounded.
[0010]
As the belt-like sheet 1, for example, a belt-like elastic sponge sheet obtained by cutting a polyethylene foam foam plastic sheet (large-area purchase standard sheet) having a thickness of about 10 mm into a belt having a constant width of about 125 mm is used. Therefore, the belt-like sheet 1 can be easily bent even in the short width direction of about 125 mm. If the width direction of the strip-shaped sheet 1 in the flat plate state is resisted by its elasticity along the dent 2a and passed through the guide body 2, the strip-shaped sheet 1 is easily deformed into a U-shaped cross section.
[0011]
The guide body 2 may have any shape as long as it can be curved into the U-shaped sheet 1a by passing the inner wall 21 of the U-shaped recess 2a so as to be applied to the lower surface 11 of the belt-shaped sheet. For example, the U-shaped curved recess 2a is cut out on the plate piece, the plate piece is erected, and the inner wall 21 (in this case, the inner edge) of the recess 2a is applied to the lower surface 11 of the belt-like sheet 1. The guide body 2 that rounds the character sheet 1a may be used. In the guide body 2 made of a plate piece, it is preferable that the guide body 2 is installed at intervals, and the shape of the U-shaped sheet 1a is more reliably maintained.
[0012]
The hot air blowing header 6 is a bottomed cylindrical body having a plurality of air vents 7 dispersed on the peripheral surface thereof, and hot air is blown out from the air vent 7 toward the U-shaped sheet inner surface 12. It is. Reference numeral 4 denotes a hot air blower with a built-in nichrome wire heater, and a bottomed tubular hot air blowing header 6 is provided so as to be orthogonal to the tip of the blower tube 5 of the blower.
[0013]
The hot air blowing header 6 is located at a position downstream of the guide body 2 and inside the U (curved inner surface) of the U-shaped sheet 1a in a section where the U-shaped sheet 1a is elastically restored and does not return to the belt-shaped sheet 1. Side). The hot air outlet header 6 of the present embodiment is formed into a bottomed cylindrical body 6 a and a slit 7 a that is a gas inlet 7 in the circumferential direction of the hot air outlet header 6. The cylindrical diameter of the bottomed cylindrical body 6a is formed to be slightly smaller than the width of the U-shaped sheet 1a, and the longitudinal direction of the bottomed cylindrical body 6a and the traveling direction of the U-shaped sheet 1a are made to coincide with each other. 6 is disposed inside the U-shaped sheet 1a. As shown in FIG. 3, the hot air outlet header 6 is arranged so that the distance from the cylindrical wall 61 of the hot air outlet header 6 to the inner surface 12 of the U-shaped sheet 1a is substantially the same at all points of the cylindrical wall 61. The reach distance from 7 to the U-shaped sheet inner surface 12 is set to be approximately equal. The air vent 7 is not provided in the disc 62 in the both end surfaces of the bottomed cylindrical body 6a which is a hot air blowing header body.
[0014]
As described above, the slits 7a are formed in the circumferential direction of the bottomed cylindrical body 6a which is a hot air blowing header body, but are not formed in a circle. As shown in FIG. 3, the slit 7 a is cut out in a C shape leaving an upper surface portion 63 (an arc range of about 100 ° to 120 °) of the bottomed cylindrical body 6 a . The hot air blower 4 is activated and the hot air passing through the blower cylinder 5 and sent to the hot air blowing header 6 is blown outward as indicated by broken line arrows in FIG. The hot air jetted from the uppermost point 71 of the slit 7a is set so as to reach the vicinity 13 of the upper edge of the U-shaped sheet 1a. This is because the hot air from the air vent 7 is distributed evenly over the entire U-shaped sheet 1a without waste. The slit width ε is about 1 mm to 5 mm, and a plurality of slits 7 a are provided at a pitch interval P of 10 mm to 50 mm in the traveling direction of the U-shaped sheet 1 a (FIG. 4).
In the present invention, the bottomed cylindrical body 6a includes a cylindrical body having a flat upper surface portion 63. Since the upper surface portion 63 where the slit 7a is not formed is not a place where hot air blows out, it is not necessary to set the reach distance to the U-shaped sheet inner surface 12 substantially equal, and the bottomed cylindrical body 6a shown in FIGS. This is because the same action and effect can be obtained.
Cross-sectional explanatory drawing is shown.
[0015]
The hot air blown out from the slit 7a serving as the air inlet 7 is controlled to a predetermined temperature in a range of 100 ° C. to 350 ° C., and a plurality of U-shaped sheets 1a fed into the hot air blow-out header 6 pass through the hot air blower. As a result, heat is sequentially applied from the air inlet 7 to soften the whole, and elastic strain generated by bending deformation by the guide body 2 is removed. If hot air is blown on the U-shaped sheet 1a in a stationary state, the U-shaped sheet 1a melts and contracts in a short time, but the U-shaped sheet 1a is molded at a predetermined speed. Since it progresses toward 3 (continuous operation), the outer shape of the U-shaped sheet 1a cannot be deformed and contracted simply by removing the elastic strain.
[0016]
The fusion heater 8 is a device that melts both side edges 13 of the U-shaped sheet 1 a at a downstream position of the hot air blowing header 6. The fusion heater 8 is disposed immediately before the mold 3. Since the molding die 3 is present in front of the molding die 3, the upper half portion of the U-shaped sheet 1a has been narrowed down as shown in FIG. 1, and both side edges 13 of the U-shaped sheet 1a approach. The fusion heater 8 is disposed close to the side edges 13 that are close to each other, and the side edges 13 of the U-shaped sheet 1a are efficiently softened and melted to advance both to heat fusion. The fusion heater 8 is a hot air dryer with a built-in nichrome wire heater so that hot hot air whose temperature is controlled in a range of 100 ° C. to 400 ° C. can be locally applied to both side edges 13 of the belt-like sheet 1 (see FIG. 2). Since the U-shaped sheet 1a has already received heat from the hot air blowing header 6, it is possible to soften and melt the side edges 13 of the U-shaped sheet 1a by applying a relatively small amount of heat from the fusion heater 8. it can.
[0017]
The molding die 3 forms a cylindrical inner wall 31 at a position downstream of the fusion heater 8 and passes the U-shaped sheet 1a through both sides 13 and 13 of the U-shaped sheet 1a so as to be thermally fused. This is a cylindrical mold that is molded into the cylindrical body 9. The mold 3 in a side view as viewed from the left side in FIG. 1 is arranged so that the lower half circle portion of the cylindrical inner wall 31 and the arc portion of the lower half of the curved recess 2a of the guide body 2 substantially coincide. Established. In the process of passing through the mold 3, the U-shaped sheet 1 a is joined and integrated on both side edges 13, 13 of the U-shaped sheet melted by the fusion heater 8. The foamed plastic cylindrical body 9 has a diameter of about 40 mmφ. The heated U-shaped sheet 1a is brought into contact with the cylindrical inner wall 31 and formed into a cylindrical body 9 close to a perfect circle. Since the U-shaped sheet 1a passes through the molding die 3 while retaining the heat received from the hot air blowing header 6 and the fusion heater 8 throughout, the U-shaped sheet 1a is formed into the cylindrical body 9 from the U-shaped sheet 1a. It is extremely rare for deformation distortion to remain. The cylindrical body 9 exiting the molding die 3 has almost no residual strain due to the molding process from the belt-like sheet 1 to the cylindrical body 9. The cylindrical body 9 having the hollow portion O that has been molded subsequently enters a cooling step (not shown) and is cooled.
The cylindrical body 9 is then commercialized by one linear cut in the longitudinal direction of the cylindrical side surface of the cylindrical body 9 with a cutting blade or the like so that the cylindrical body 9 can be attached later to a water pipe or the like. In addition, even if it cuts linearly, since elastic distortion and the distortion accompanying shaping | molding are removed and it shape | molds in the cylindrical body 9, it does not elastically restore to the strip | belt-shaped sheet | seat 1. FIG.
[0018]
The apparatus for manufacturing a cylindrical body made of foamed plastic having such a structure rolls the belt-like sheet 1 in advance into a U-shaped sheet 1a that is one step closer to the cylindrical body 9 by the guide body 2, and further blows hot air inside the U-shaped sheet 1a. Since the header 6 is disposed and hot air is blown onto the inner surface 12 of the U-shaped sheet 1a, heat can be efficiently transmitted to the U-shaped sheet 1a.
[0019]
Further, the hot air blowing header 6 is formed as a bottomed cylindrical body with a plurality of air vents 7 dispersed on its peripheral surface, and hot air blows out from the air vent 7 toward the inner surface 12 of the U-shaped sheet 1a. Therefore, the U-shaped sheet 1a can be heated evenly, and the elastic deformation strain accompanying the formation of the U-shaped sheet 1a can be effectively removed. In particular, when the hot air blowing header 6 is a bottomed cylindrical body 6a and a slit 7a is provided as a vent 7 in the circumferential direction, any portion of the U-shaped sheet 1a that is advanced by the molding process is formed from the slit 7a. Since the hot air blown out is surely crossed, the entire U-shaped sheet 1a is heated evenly. As in the present embodiment, when a plurality of slits 7a are formed at appropriate intervals along the traveling direction of the U-shaped sheet 1a, the U-shaped sheet 1a is gradually heated and increases in temperature as it crosses the slit 7a. As a result, the entire surface of the U-shaped sheet can be heated uniformly without causing alteration or the like due to a rapid rise in temperature.
[0020]
In addition, since the U-shaped sheet 1a in the softened state heated uniformly by the hot air blowing header 6 is guided into the molding die 3 in a state of retaining heat over the entire sheet, the cylindrical body 9 is formed. The cylindrical body 9 is formed in a shape close to a perfect circle. As in the prior art, the problem of the triangular mussels having the planar portion that was not partially heated by the belt-like sheet 1 or the U-shaped sheet 1a remains. In particular, as in the present invention, the hot air blown into the U-shaped sheet 1a from the hot air blowing header 6 or the fusion heater 8 is formed by the curved U-shaped sheet 1a so that the hot air is outside the U-shaped sheet 1a. Therefore, a part of the hot air is brought into the molding die 3 together with the U-shaped sheet 1a, and the cylindrical body 9 in the molding stage is pressed against the cylindrical inner wall 31 and shaped. For this reason, the cylindrical body 9 that is closer to a perfect circle in the molding die 3 is neatly molded. According to the apparatus for manufacturing a foamed plastic cylindrical body of the present invention, the cylindrical body 9 close to a perfect circle can be reliably manufactured, and can be brought into close contact with a predetermined pipe surface.
Furthermore, it is possible to provide the guide body 2 so that the lower half of the U-shaped sheet 1a substantially matches the shape of the lower half of the cylindrical body 9, and if this form is maintained and heated by the hot air blowing header 6, In the pre-molding stage through the hot air blowing header 6, it is possible to form the lower half of the cylindrical body 9 and remove the elastic strain of this portion. The molding accuracy of the cylindrical body 9 can be further improved.
[0021]
In addition, in this invention, it is not restricted to what is shown to the said embodiment, According to the objective and a use, it can change variously in the range of this invention. The shape, size, material, and the like of the belt-like sheet 1, the guide body 2, the hot air blowing header 6, the air inlet 7, the fusion heater 8, the mold 3, and the cylindrical body 9 can be appropriately selected according to the application. For example, although the plurality of slits 7a are provided around the hot air blowing header 6 in this embodiment, the small air holes 7 are formed in a dot shape with appropriate intervals around the hot air blowing header 6. Many may be established. Further, the air inlet 7 may be opened in the front and rear discs 62 of the hot air blowing header 6. The belt-like sheet 1 is not limited to the foamed polyethylene sheet of the embodiment, and other foamed plastic sheets can be used.
[0022]
【Effect of the invention】
As described above, the apparatus for manufacturing a foamed plastic cylindrical body according to the present invention is capable of efficiently applying heat to the U-shaped sheet by arranging a guide body, a hot air blowing header, and a fusion heater in front of the mold, In addition, the entire U-shaped sheet is uniformly heated by the heat from the air vent of the hot air blowing header, so that the deformation distortion associated with the formation from the belt-shaped sheet to the U-shaped sheet and the cylindrical body is effectively removed. As a result, a cylindrical body close to a perfect circle can be produced, and an excellent effect is exhibited.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an apparatus for producing a foamed plastic cylindrical body according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the apparatus of FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an enlarged front view of a hot air blowing header.
FIG. 5 is a perspective view schematically showing a conventional body manufacturing apparatus.
FIG. 6 is a cross-sectional view of a heat insulating cover formed by a conventional forming apparatus.
[Explanation of symbols]
1 Belt-shaped sheet 11 Lower surface 1a U-shaped sheet 12 Inner surface
13 Upper edge vicinity 2 Guide body 2a Recess 21 Inner wall 3 Mold 31 Cylindrical inner wall 6 Hot air blowing header 63 Upper surface part 7 Air vent 7a Slit
71 Topmost point 8 Fusion heater 9 Cylindrical body

Claims (1)

A U-shaped curved recess is formed, and a guide for bending the belt-like sheet into a U-shaped sheet having a U-shaped cross section by passing through the inner wall of the recess so as to be applied to the lower surface of the foamed plastic belt-like sheet Body,
Is disposed inside the U-shaped sheet downstream position of the guide body, and the bottomed cylindrical body allowed and match the travel direction of the cylinder longitudinal direction the U-shaped sheet, further periphery of the bottomed cylindrical body A plurality of air vents made of slits that are cut out in a C shape in the circumferential direction are left dispersed on the surface, and hot air blown out from the uppermost point of the slit is formed on the U-shaped sheet. Hot air that softens the U-shaped sheet and removes the elastic strain generated by the curved deformation so that hot air blows out from the air vent set to reach the vicinity of the upper edge toward the inner surface of the U-shaped sheet. A callout header;
A fusion heater for melting both side edges of the U-shaped sheet at a downstream position of the hot air blowing header;
A molding die that forms a cylindrical inner wall at a position downstream of the fusion heater, passes the both side edges of the U-shaped sheet so as to be thermally fused, and molds the U-shaped sheet into a cylindrical body. Equipped,
A belt-like sheet in a flat state introduced into the guide body proceeds at a constant speed, and is formed into a cylindrical body by passing through the hot air blowing header, the fusion heater, and the forming die. Equipment for manufacturing foamed plastic cylinders.

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