Method of producing double-wall plastic material tubes

专利摘要:
1525450 Plastics tube W HEGLER 14 July 1977 [24 Aug 1976] 29649/77 Heading F2P [Also in Division B5] In making a double-walled tube of plastics material (particularly of polyethylene, polypropylene or polyamides) with a transversely corrugated outer wall 2 and a smooth inner wall 1, the corrugations are formed by means of a system of circulating dies, openings 4 are made either in the outer wall so as to connect the corrugation channels to the external atmosphere, or between the two walls (Fig. 8, not shown) so as to connect together the corrugation channels and the openings are subsequently welded closed after the inner tube has cooled. The openings may be pierced when the tube leaves the dies or when it is moving through the system of dies preferably when the tube walls are vertical or substantially so. Blister like elevations 3 may be formed in which the openings are pierced and the openings may be in the crest or the walls (Fig. 9, not shown) of the corrugations. The closing of the openings may be by hot surface welding or by ultrasonic welding. The height of the corrugations and the wavelength thereof can be 8 to 12% of the internal diameter of the tube.
公开号:SU708992A3
申请号:SU772512604
申请日:1977-08-10
公开日:1980-01-05
发明作者:Хеглер Вильхельм；Хеглер Ральф-Петер
申请人:Hegler Wilhelm；Hegler Ralf Peter；
IPC主号:

专利说明:

form at the exit of the pipe from the conveyor or in the conveyor.
In addition, when the outer pipe is corrugated in a conveyor, protrusions are formed in tofras, in which holes are then pierced, and the holes are sealed by surface heating or ultrasonic welding, and the holes are formed in the corrugations along the horizontal plane of the pipe.
The manufacture of double-wall plastic pipes according to the proposed method will make it possible to eliminate the pressure drop in the annular corrugations when the pipes are cooled, which will increase their quality.
FIG. Figure 1 shows a tube with molded holes in annular corrugations, a cross section; in fig. 2 - the same, horizon. Regular cut; in fig. 3 - pipe with welded holes, horizontal section; in fig. 4, a known double-walled tube (for clarification of pressure molding); in fig. 5 - tube with punctured holes, cross section; in fig. 6 - the same, vertical longitudinal section; in fig. 7 - pipe with corrugations having openings communicating with each other, cross section; in fig. 8 is a partial section of the pipe of FIG. 7; in fig. 9 - pipe with protrusions formed on the side of the corrugations, section.
The method of manufacturing double-walled plastic pipes is carried out as follows (Fig. 2 and 4).
Extruded simultaneously outer 1 and inner 2 tubular thermoplastic billet. Then, the outer pipe 1 is corrugated with the help of half-molds placed on parallel branches of the conveyor (not shown in the drawings) using the pressure difference in the corrugated section. Next, the inner tube 2 is connected to the corrugations 3 of the outer tube 1 by feeding compressed air into the cavity of the inner tube. 2 and cool the product.
On the conveyor with forms (not shown in the drawings), the outer tube 1 is cooled so that it becomes stable. Since the inner pipe 2 transfers heat only through small sections 4 between the corrugations 3, in which the outer I and inner 2 pipes are welded to one another, the inner pipe is insufficient. precisely cooled and remains in a thermoplastic state. In order to remove heat from the inner tube 2, the outer tube 1 is cooled more intensively, for example, by means of a water bath or by spraying with water. The air in the annular corrugation 3, which when the pipes 1 and 2 are connected, has a temperature in the order of 2PO ° C and a pressure of 1.2 atm, is cooled to room temperature, which causes a decrease in pressure in the annular corrugation 3 to about 0.5 atm. The pressure difference arising upon cooling in the corrugation 3 can deform section 5 of the still thermoplastic internal
pipes 2.
So that such deformation does not occur, holes 6 are formed in the corrugations 3. These holes are formed when the pipe 1 leaves the conveyor or in the conveyor (not shown in the drawings). For
This in the forms provided the corresponding protrusions (drawing not shown).
For greater strength when the outer pipe 1 is corrugated, protrusions 7 are formed in the corrugations 3, in which holes 6 are then pierced. These holes are arranged in the corrugations along the horizontal diametral plane of the pipe (Fig. 1). With this fabrication of double-walled tubes, water droplets trapped by a stream of air fall in the vertical plane of the corrugation 3,
where they evaporate. If the holes 6 were formed vertically in the corrugations 3 vertically from the top, the water droplets fell on the section 5 of the inner pipe 2, and this section of the pipe 2 would suddenly cool and deform (Fig. 5, 6).
By. One of the embodiments of the method in the corrugations 3 is formed by interconnecting holes 8 (Fig. 7, 8). This makes it possible to compare the pressure in the corrugations with the atmospheric pressure, since the end holes 8 communicate space in the corrugations with the external environment, which eliminates the formation of scars on the outer sides of the corrugation 3.
In another embodiment, the method of the protrusions 7
molded on the side surface of the corrugation-3, and the holes 6 are excavated from above at an angle (Fig. 9). This is an artificial scar formation on the outer perimeter of the corrugation 3.
After cooling the inner tube wall
2, the holes 6 are sealed by surface heating or ultrasonic welding, after which the pipe manufacturing cycle ends.
In the manufacture of double shshstmassovyh
The tubes of the invention improve their quality.

权利要求:
Claims (7)
[1]
Invention Formula
I. A method of manufacturing double-walled plastic pipes, which includes extruding the outer and inner tubular thermoplastic blanks, corrugating the outer pipe with the help of molds placed
on parallel branches of the conveyor, using a pressure difference on a corrugated 5 astka connecting the inner tube with the corrugations of the outer tube by supplying compressed air
into the cavity of the inner tube and cooling of the product, characterized in that, in order to improve the quality of tubes having ring-shaped transverse corrugations of the outer wall, and by equalizing the air pressure in the corrugations with atmospheric, in the corrugations they form openings that connect them with the atmosphere The inner tube is sealed by welding.
[2]
2. The method according to claim 1, about tl and h and y and with the fact that in the corrugations form holes that communicate them to each other.
[3]
3. A method according to claim 1, characterized in that the holes are formed when the pipe leaves the conveyor.
[4]
4. A method according to claim 1, characterized in that the holes are formed in the conveyor.
[5]
5. A method according to claim 1, characterized in that when the outer pipe is corrugated in a conveyor, protrusions are formed in the corrugations, in which holes are then pierced.
[6]
6. A method according to claim 1, characterized in that the holes are sealed by means of surface heating or ultrasonic welding.
[7]
7. A method according to claim 1, characterized in that the holes are formed in the corrugations along the horizontal diametral plane of the pipe.
Sources of information taken into account in the examination
1. For the FRG N 2413.879, cl. On 29 D 23/18, 1976.
2. For the FRG N 2413.878, cl. B 29 D 23/18,
1976 (prototype).
Fig.G
-g. 2
.З
FIG. 6
F.
ig.7
FIG. 9

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同族专利:

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公开号 | 公开日

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AU506193B2|1979-12-13|

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DE2637995A1|1978-03-02|

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DD132728A5|1978-10-25|

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BE858036A|1977-12-16|

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US4303104A|1981-12-01|

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PL200414A1|1978-04-24|

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FI64074C|1983-10-10|

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YU201477A|1982-08-31|

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HU175927B|1980-11-28|

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NL7707369A|1978-02-28|

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SE422760B|1982-03-29|

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FR2362715A1|1978-03-24|

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US4145387A|1979-03-20|

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CS196373B2|1980-03-31|

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GB1525450A|1978-09-20|

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AU2726977A|1979-02-01|

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AT366315B|1982-04-13|

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JPS5326869A|1978-03-13|

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NO772572L|1978-02-27|

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FI64074B|1983-06-30|

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ES460822A1|1978-04-16|

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TR19812A|1980-01-03|

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FI772332A|1978-02-25|

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BR7705605A|1978-05-30|

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IN148290B|1981-01-03|

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NZ184598A|1979-11-01|

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DK375477A|1978-02-25|

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DE2637995C2|1983-05-26|

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ATA463977A|1981-08-15|

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

---

DE2637995A|DE2637995C2|1976-08-24|1976-08-24|Process for the production of double-walled plastic pipes with an annularly corrugated outer wall and a smooth inner wall|

---