Pipe made out of the foamed plastic used for the heat-insulation of the pipelines, and the method of its continuous manufacture

FIELD: chemical industry; other industries; production of the pipes made out of the foamed plastic used for heat-insulation of the pipelines.

SUBSTANCE: the invention is pertaining to the heat-insulation of the pipelines. The pipe made out of the foamed plastic and used as the heat insulation of the pipelines has external and internal surfaces. The internal surface is coated with the additional layer of the connected with it by the adhesive fibers. The fibers are manufactured out of the material with the melting point exceeding the melting point of the foamed plastic. The free ends of the fibers fixed to the internal surface of the pipe are spaced from the sticky layer by the distance equal to the length of the fibers. The fibers uniformly distributed on the internal surface of the pipe and cover from 2 up to 20 % of its internal surface. The linear density of the fibers makes from 0.5 up to 25 decitex, and the length - from 0.2 up to 5 mm. The invention also concerns the method of the continuous manufacture of the pipe out of the foamed plastic for the heat-insulation of pipelines. The pipe manufactured out of the foamed plastic with such additional layer of the fibers has the higher heat-resistance and the lower thermal conductivity in comparison with ordinary insulation pipes made out of the foam plastic.

EFFECT: the invention ensures, that the pipe manufactured out of the foamed plastic with such additional layer of the fibers has the higher heat-resistance, the lower thermal conductivity in comparison with ordinary insulation pipes made out of the foam plastic.

4 cl, 3 dwg

 

The present invention relates to intended for (heat) insulation of pipelines pipe foam with an outer surface and an inner surface with an additional adhesive layer. The invention relates also to a method of continuous manufacture intended for thermal insulation of pipelines pipe foam, in the exercise of which Styrofoam ekstragiruyut pipe with outer and inner surfaces of the extruded tube is cut in the axial direction from the outer to the inner surface of the cut pipe straighten, and on the inner surface of a flattened tube put a layer of adhesive material, which is then coated with an additional layer which is glued with a layer of adhesive material, after which the thus obtained multi-layer sheet bend, pressing and connecting the edge of the cut previously pipes to each other with the receipt with the original shape of the pipe, covered inside with a layer of adhesive material and an additional layer.

Such foam pipe and method of continuous manufacture is described in EP 1208962 A1. An additional inner layer of such pipes is made of a material with a low coefficient of friction, on which the slides are inserted into the insulating pipe of the pipeline. The additional layer can be reinforced with fibers or run it from Fox the new foam, for example, from polypropylene.

In the manufacture of insulating foam tubes as described above pipe with an additional internal layer is ready to be connected in the longitudinal direction by welding or glue the edges to cut the pipes and the same original form.

Currently there are many different methods for the production of insulating foams, the most common of which is extrusion. Foaming extrudable polymer occurs as a result of physical or chemical foaming during extrusion. When the physical foaming the polymer is mixed with a volatile gas, and the resulting mixture is rapidly expanding at atmospheric pressure at the exit of the extruder. The chemical foaming volatile gas is formed as a result of a chemical reaction, for example by decomposition of the additive concerned or directly during the polymerization reaction.

One of the drawbacks of foams is their low heat (or thermal resistance). Usually all foams at a temperature close to the melting temperature of the primary polymer, lose their stability, and therefore the possibility of their use greatly depends on the outside temperature. When using foams for thermal insulation of pipelines such a critical out what her temperature is high enough, the temperature of the outer surface of the pipeline, which requires an increase in thermal stability of the foam. For this purpose, in particular, it is necessary that an insulating layer located between the hot pipe of the pipe and the foam had high heat resistance and simultaneously low heat conductivity. The insulation foam layer with high heat resistance can be ensured simply by selecting an appropriate material having a high thermal resistance. On the other hand, the reduction of thermal conductivity of the heat insulating layer is a quite difficult task, since thermal conductivity of most materials is much higher than the conductivity, which must have a heat insulating layer.

In some cases, for example, when insulating porous polypropylene pipes made of copper, on the border between polypropylene and copper chemical reaction occurs and the foam collapses.

In DE 19635214 A1 describes a multilayered sheet insulating material for heat and sound insulation. This material consists of at least two separate layers made of flexible material, in particular from sheets of non-woven fibers, paper or other similar material, and located between the intermediate elements. The intermediate elements are made of individual fibers, located perpendicula is but the layers of flexible sheet material. Some intermediate the ends of the fibers glue is connected to one of the layers of flexible sheet material into bundles of parallel fibers, which are located at a distance from each other in a certain order. The other ends of the intermediate fibers touched another flexible sheet, which is pressed against the ends of the fibers. Intermediate fibers remain between the layers a certain distance, at which the conductivity between them is essentially not different from thermal conductivity in the place of air.

The present invention was used to develop continuously produced pipe foam for thermal insulation of pipelines with optimal thermal resistance (high resistance) and optimal conductivity, which could be used for thermal insulation of pipelines, the outer diameter of which lies in a certain range.

This problem is solved by using the proposed invention the tube of foam above-mentioned type, having an extra layer of fibers with a linear density of from 0.5 to 25 decitex and a length of from 0.2 to 5 mm, which is made of a material with a melting point greater than the melting temperature of the foam, and which are elongated in the direction of a Central axis of the tube, glued to the inner surface and uniformly dissolved, and edeleny on the inner surface of the pipe, closing from 2 to 20%, preferably from 4 to 10%, of its inner surface.

In the invention it is also proposed a method of manufacturing tubes of foam above-mentioned type with an additional layer of fibers with a linear density of from 0.5 to 25 decitex and a length of from 0.2 to 5 mm and a melting temperature greater than the melting temperature of the foam, namely, that open the inner surface of a flattened tube kasemset and fibers electrostatically charged so that one ends of the fibers are attracted and stick to the sticky layer uniformly covering from 2 to 20%, preferably from 4 to 10%, adhesive layer, and their other free ends are at a distance from the adhesive layer equal to the length of the fibers.

In a preferred embodiment, United with the inner surface of the pipe additional fiber layer are elongated in the radial direction.

The additional fiber layer is preferably made of a polymer, in particular of polyamide or polyurethane, which, however, does not exclude the possibility of using for this purpose viscose fibers, aramid fibers, fiberglass, or carbon fiber.

Pipe foam can be produced from thermoplastics, thermosets or elastomers.

Proposed in the invention, the tube of foam has much better properties than ICNA pipe foam, and therefore can be used for thermal insulation of pipelines. Thus, in particular, it has a lower thermal conductivity (coefficient lambda), withstands higher temperatures and can be easily mounted on the pipeline. In addition, with proper implementation of the additional layer and the proper choice of the diameter and length of fibers of the proposed invention the pipe with a compressible inner layer can be used for thermal insulation of pipelines of different diameters.

Proposed in the invention, the tube can be manufactured from conventional foams processed on conventional equipment designed for extrusion and foaming of polymers. When manufacturing in continuous mode extruded tube of foam cut and unbend (straighten), after which the inner surface is cut and bent pipes put a layer of glue. Immediately after that, a layer of glue down the ends of the electrically charged short and thin polymer fibers. Hardening glue the ends of the fibers are firmly connected with the insulating tube, the inner surface of which is thus covered by standing on her thin and short fibers.

The inner layer of the pipe is partially covered by the fibers of the surface consists mainly of air. The conductivity of this layer is less teploprovodnostyu and reduces the conductivity of the entire insulating tubes. In addition, small fibers made from a material, preferably of a polymeric material with a high melting point and low thermal conductivity, allow the use proposed in the invention the tube of foam at much higher temperatures compared to the temperatures at which use conventional insulating tubes of foam.

The adhesive is made from self-adhesive material, such as hot melt adhesive material or from a dispersion adhesive, which slightly affects the thickness of the pipe and its main properties.

More information on distinctive features and advantages of the present invention discussed below on the example of one of the variants of its possible implementation with reference to the accompanying description of the drawings on which is shown:

figure 1 is a cross section proposed in the invention of pipe foam,

figure 2 - graph of the influence of the thickness of the layer of fibers on thermal conductivity of the entire proposed in the invention of pipe foam and

figure 3 - installation for continuous production of pipes made of Styrofoam proposed in the invention method.

Figure 1 shows the cross section of the pipe 13 of the foam, in this case, a foamed elastomer, with the outer surface 11 and inner surface 12. Wew the indoor surface 12 of the pipe is coated with a thin adhesive layer 20, that keeps it one of the ends of the fibers of the additional layer 30. The fiber is essentially radial. Fibers made from a polymer, the melting temperature greater than the melting temperature of the foam. Fibers have essentially the same linear density and length and evenly cover from 2 to 20% of the whole is covered with an adhesive layer 20 of the inner surface 12 of the pipe.

Figure 3 shows the scheme of the technological line on which of foam in a continuous way to make the offer in the invention of insulating the pipe 13. Extrudable (position 41) foam pipe is first cut (position 42) and straighten (position 43), and then on its inner surface 12 with the help of special equipment applied (position 44) a thin layer of glue. Immediately after this, to the inner surface of the grounded (at 46) of the pipe stick extends to the pipe electrically charged (position 45) short and thin polymer fibers. After hardening (position 47) of the adhesive fiber is firmly connected with the inner surface of the insulating pipe. Vertically electrically charged fibers are attracted to the flattened tube and evenly glued their lower ends to its covered with a thin layer of the adhesive on the inner surface, after which the pipe bend again the (position 43), giving it an initial shape of a tube whose inner surface is covered evenly spaced radial fibers. This operation, which is done after hardening (position 47) glue, Fig. 3 is not shown. Giving the tube the original shape and butt joint edges formed by the longitudinal cutting, described in detail in EP 1208962 A1. In the finished tube fiber cover from 2 to 10% of the area of its inner surface. The degree of coverage of the internal surface of the pipe fibers depends on the properties that should have finished pipe, and the type chosen for this fiber.

To cover the inner surface of the pipe adhesive layer using a commercially available spray adhesive is a solvent based, and the fibers have a linear density of 6.6 decitex and a length of 1.0 mm For samples of foam, from which are made the trumpet, and pipe, coated fibers, measured by the average value of the coefficient of thermal conductivity. The results are shown in the table.

Table
Comparison of thermal conductivity sheet of foamed elastomer and offer made in the invention by way of the sheet after curing of the adhesive (item 47)
SampleThe thickness of p is noplast The thickness of the layer of fibersTotal sheet thicknessCoefficient of thermal conductivitythermal coefficient
Foamed elastomer25.4 mm-25.4 mm0,03820,265
Proposed in the invention product25.4 mm1.0 mm26,4 mm0,03860,255

Data presented in table indicate that in the presence of internal pipe surface layer of fibers with an average coefficient of thermal conductivity is reduced by 0,0014 W/m2-K. However, due to measurement errors, equal in this case approximately 0,006 to conduct further experiments it is difficult to predict how by increasing the length and thickness of the fibers can be achieved even greater increase in the coefficient of thermal conductivity. Obviously, in addition to the thickness and length of the fibers on thermal conductivity is also affected by coating the internal surface of the pipe. We can assume that the efficiency of coating the inner surface of the pipe with a layer of fibers primarily depends on the relationship between isolation and fibers since the conductivity of a single layer of fibers is equal to approximately 0,030 W/m2·K. In this case, the coefficient of heat is rovagnati layer is from 0,010 to 0.15 W/m 2·K. Proposed in the invention, the pipe can be considered as a system of two layers of different materials with different coefficients of thermal conductivity equal, as shown in figure 2, respectively lambda 1 and lambda 2, and different thickness. When this thickness is shown in figure 2, a layer 30 of fibers has been taken equal to the length of the fibers.

Most foams have a relatively low melting point, and therefore they can be used for the insulation of pipelines in a limited temperature range. In the manufacture of fibers from a polymer with a high melting temperature (Tm1figure 2) temperature Tm2used as the insulation foam is substantially less than the surface temperature of the pipeline. The first tests of the foams showed that the foam melts at the temperature of the outer surface of the pipeline is equal to 113°and foam from the inner layer of fibers at this temperature doesn't even stick to the outer surface of the pipeline.

In some cases, the foam or the pipe itself discolored or even destroyed. It is known, for example, polypropylene, is destroyed in the presence of copper (Cu), and therefore cannot be used for thermal insulation of pipes made of copper. The tests showed that the insulation of the usual penopolimery the Lena one day begins to break down when 123° Second, whereas in the insulation with an inner layer of fibers no signs of destruction was detected after two days. These results demonstrate a significant improvement in the heat insulation by coating the inner surface of the additional layer of fibers. Fibers form an additional thermal barrier between the copper pipe and polypropylene, and so prevent its thermal destruction.

Even in the presence of flame retardants, which are often used in insulation, some made of polymer pipes, arising between the insulation and the pipe chemical reactions change their color (yellow). The presence of the additional layer of fibers solves this problem.

Depending on the type of fibers, the layer of fibers may be very soft and elastic, and very hard and rough. Soft and elastic layer of fibers has a lower coefficient of friction, and therefore easier to glide over the surface of the pipe. In addition, pipe foam with a soft layer of fibers can be used for thermal insulation of pipelines of different diameters, which helps to visibly reduce the range of the foam pipe.

Example

A polyethylene tube with an inner diameter of 34 mm and a wall thickness of 10 mm was extrudible, using isobutane as a physical foaming is Ghent. The resulting tube was cooled for 1 min and cut (position 42) in the longitudinal direction, and then, using a special head, covered (position 44) layer of glue. Immediately after application (position 44) glue the inside of the expanded pipe covered with a layer of pre-charged (position 45) on the appropriate equipment polyamide fibers density 22 decitex and a length of 3 mm After curing of the adhesive-coated fiber sheet was rolled up in the tube and connected to its free edge in the longitudinal direction of the hot, heated to 350°With air, opravlyaushi coupled edges. The obtained coated inside with a layer of fiber pipe with an inner diameter of 28 mm and a wall thickness of 13 mm and a higher heat resistance and lower thermal conductivity compared to conventional insulating tubes of foam cut to pieces two meters long and Packed.

1. Pipe foam for insulation of pipes having outer and inner surfaces and associated with the inner surface of the additional layer, wherein the additional layer comprises fibers with a linear density of from 0.5 to 25 decitex and a length of from 0.2 to 5 mm, which is made of a material with a melting point greater than the melting temperature of the foam, and which are elongated in the direction of the Central nervous system, the y axis of the pipe, glued to the inner surface and evenly distributed on the inner surface of the pipe, closing from 2 to 20%, preferably from 4 to 10%, of its inner surface.

2. Pipe foam according to claim 1, characterized in that the fibers are located on the inner surface of the pipe essentially radially.

3. Pipe foam according to claim 1 or 2, characterized in that the fibers made from a polymer.

4. Method for continuous manufacture of pipe foam for the insulation of pipelines, namely, that ekstragiruyut pipe foam with outer and inner surface, the pipe is cut in the longitudinal direction from the outer to the inner surface of the cut pipe straighten, on the inner surface of the flattened cut pipe put a layer of glue, the glue layer cover connected to it an additional layer, covered with a layer of glue and an additional layer of flattened tube attach the original form that it had before its longitudinal cutting, and connect the butt of its longitudinal edges, wherein the additional layer is made from fibers with a linear density of from 0.5 to 25 decitex and a length of from 0.2 to 5 mm, melting point which is higher than the melting temperature of the foam, covered with a layer of adhesive to the inner surface of a flattened tube kasemset, electrically connected to the charger, side buttons is tons of fiber so that one of their ends penetrate into the adhesive layer and evenly cover from 2 to 20%, preferably from 4 to 10%, the inner surface of the pipe, and their other free ends are located at a distance from the adhesive layer, equal to the length of the fibers.



 

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