WO1998026921A1

WO1998026921A1 - The method of manufacturing a pipe having bending capability and a pipe having bending capability

Info

Publication number: WO1998026921A1
Application number: PCT/PL1997/000029
Authority: WO
Inventors: Walter Kaczorowski
Original assignee: Walter Kaczorowski
Priority date: 1996-12-17
Filing date: 1997-12-08
Publication date: 1998-06-25

Abstract

The first method prescribed by the invention consists in the helical wrapping (11) of the lower (3) and the upper (4) tape and an interim steel wire onto a head, wherein the lower (3) and upper (4) tapes being already covered by a glue layer on one side, the upper tape (4) is turned over so that both the lower (3) and the upper (4) tapes have the glue layers facing each other and located so that the lower tape (3) is under the uper tape (4) and the upper tape (4) is displaced horizontally with respect to the lower tape (3). Steel wire (10) is introduced between the lower (3) and the upper (4) tapes. The pipe having bending capability (12) manufactured by means of the first method prescribed by the invention consists of two continuous coatings: outer formed from the helically wrapped upper tape (4) with the glue layer on the lower surface and inner formed from the helically wrapped lower tape (3) with the glue layer on the upper surface, wherein the steel wire (10) wrapped helically is between both coatings.

Description

The method of manufacturing a pipe having bending capability and a pipe having bending capability

The subject of the invention is the manufacturing method of a pipe having bending capability and a pipe having bending capability thus . manufactured, designed for transporting pumped or sucked ventilation air.

The patent description US No. 4,611,635 defines the method of manufacturing a pipe having bending capability from a helically wrapped continuous tape formed by bonding two rubber tapes, wherein bonded tapes do not adhere entirely, whereby the edges of those tapes after bonding form slots extending to the depth of said tape. The bonded tape is wrapped helically over the spinning head in such a way that the slot of one edge of the tape joins the slot of the other edge of the tape and after these are bonded, forms a continuous pipe having bending capability.

A protective description of the utility model Ru 45891 concerns a ventilation pipe having bending capability with a flexible coating covered by a helically wrapped wire mesh reinforcement. The pipe ends have pockets formed by flanging the flexible coating. The edges of the flanged flexible coating reach beyond the first wire convolutions. These pockets comprise rings. The mesh reinforcement convolutions are bonded to the superficies of the flexible coating by means of a cover plate which comprises mesh reinforcement convolutions, while its edges are bonded inseparably to the coating material.

A ventilation pipe having bending capability known from the patent description No. PL 144 484 with a sleeve outlet at least on one side comprising a mesh reinforcement inside the flexible coating made of a helically wrapped wire mesh, wherein adjacent wire convolutions are articulately interconnected around the convolution perimeter. The end of the pipe having bending capability is mounted on the sleeve, bonded by means of a band clip.

The method of manufacturing a pipe having bending capability comprising a mesh reinforcement made of a wire mesh and a flexible coating bonded thereto, consisting in a helical wrapping of the wire mesh and the tape on the head, prescribed by the invention consists in covering the lower and upper tapes unwound from a drum with a glue layer on one side, said tapes being of the same width preferably of polyesther foil, then the upper tape is turned over so that the adhesive sides of said tapes face each other. Said tapes whose adhesive layers face each other are positioned in such a way, that the lower tape is under the upper tape and that the upper tape is displaced horizontally with regard to the lower tape. Unreeled steel wire is introduced between both tapes and the lower tape with a glue layer, the wire and the upper tape with a glue layer are all wrapped helically over the head at the same time. The lower tape with a glue layer on the upper surface is wrapped helically so that each subsequent convolution of this tape overlaps the edge of the preceding convolution joining the edges of the lower tape. In places where the edges of the lower tape were bonded, approximately in the middle of their width, steel wire is wrapped helically at the same time, while the upper tape with a glue layer on the lower surface is wrapped helically at the same time over the wire so that for each convolution, this tape overlaps the edge of the preceding convolution, joining the edges of the upper tape. The upper tape remains in contact with the adhesive layer and is pressed at the same time to the adhesive layer between the bonded edges of the helically wrapped lower tape, forming a continuous, double-layer pipe having bending capability. The contact between the upper tape and the wire takes place approximately in the middle of the tape width.

The modification of the method of generating a pipe having bending capability consists in that the polyesther tape, preferably metallized is unreeled, covered on one side by a glue layer, whereupon it is wrapped helically over the head, the adhesive layer upwards. The helical wrapping of both the tape and the wire commences at the same time. The wire is wrapped over the glue layer of the tape convolution in its middle. Said convolution with a glue layer and the wire are covered by another tape convolution without a glue layer, then by the tape convolution with a glue layer and the wire. Both tapes with the wire between them form a continuous, double-layer pipe having bending capability.

A pipe having bending capability comprising a mesh reinforcement made of wire and a flexible coating, the invention prescribes that the flexible coating comprises two continuous coatings: outer and inner. Helically wrapped steel wire is between both coating. The outer coating is formed from a helically wrapped upper tape with a glue layer on the lower surface, while the inner coating is formed from a helically wrapped lower tape with a glue layer on the upper surface.

A variation of the pipe having bending capability has a flexible coating comprising bonded to continuous edges of the helically wrapped tape, with a helically wrapped steel wire in between.

A variation of the pipe having bending capability may be equipped with a pipe wrapping, preferably made of a glass wool. The pipe wrapping is placed on the perimeter of the outer coating of the pipe having bending capability and is protected within its entire length against sliding by a band clip preferably made of flexible mesh placed in a flexible sleeve preferably made of polyethylene foil. The band clip ensures good adhesion of the pipe wrapping to the pipe having bending capability and its outer layer ensures good sliding when introducing the pipe having bending capability together with the pipe wrapping into a flexible sleeve. The flexible sleeve us an outer coating of the pipe having bending capability.

Each method prescribed by the invention, ensures a simple, uncomplicated way of manufacturing a leakproof pipe having bending capability of any diameter, which at the same time has very good mechanical properties. All modifications of the pipe having bending capability prescribed by the invention ensure good air flow and good strength over the whole length. Thanks to its bending capability, the pipe having bending capability may be easily installed where ventilation ducts must be placed in bends. A double-layer of the flexible coating ensures the tightness of the ventilation duct. The wire mesh mesh reinforcement prevents the subsidence of the double-layer flexible pipe coating under the suction of the ventilator which may be connected to this pipe. The possibility of using a pipe wrapping on the perimeter of the pipe having bending capability prescribed by the invention allows to avoid thermal losses in cases these losses may be significant. The pipe wrapping results in noise reduction and forms an insulation against vibrations, which may appear during the operation of the ventilation equipment.

Invention figures are presented on a drawing where fig. 1 shows a schematic method of manufacturing the pipe having bending capability from two tapes, fig. 2 - a schematic view of the wall section of the pipe having bending capability made of two tapes, fig. 3 - a perspective view of the pipe having bending capability made of two tapes, fig. 4 - a section of the pipe having bending capability made of two tapes, fig.5 - a section of the pipe having bending capability made of two tapes equipped with the pipe wrapping, fig. 5 - a schematic method of manufacturing the pipe having bending capability from one tape, fig.6 - a perspective view of the pipe having bending capability made of one tape, fig. 7 - a section of the pipe having bending capability made of one tape, fig. 8 - a section of the pipe having bending capability made of one tape equipped with the pipe wrapping.

As shown on fig 1, the method of manufacturing a pipe having bending capability from two tapes: lower 3_ and upper 4_ consists in unreeling simulaneously two tapes: lower 3_^ and upper -4 from two reels 1_ and 2_^ of the same width, made of the polyesther foil. Both tapes: lower _3 and upper 4_ are conducted with constant speed over the guide rolls _5 to the gluer _6 where one side of said tapes is covered by glue layer, the excess of the solvent is evaporated from the glue layer inside a dryer 7, then the upper tape 4 is turned over by means of a roll unit 8_ with the glue layer facing down. The tapes: lower _3 and upper _4 whose glue layers are positioned so that the upper tape _4 is over the lower tape 3_^ though the upper tape 4_ is displaced horizontally as regards the lower tape 2S. A steel wire 10 unwound from the reel 9_ is introduced between the lower _3 and upper 4_ tapes while the lower tape _3 with a glue layer on the upper surface, the wire 1_0 and upper tape _4 with a glue layer on the lower surface are wrapped helically at the same time over the head 1L.. The lower tape 3_ with a glue layer on the upper surface is wrapped helically so that each subsequent convolution of the lower tape _3 overlaps the edge of the preceding convolution, bonding the edges of the lower tape 3_. Steel wire 1J3 is wrapped helically over the bonding bonding of the lower tape 3>, approximately in their middle, while the upper tape _4 with a glue layer on the lower surface is wrapped helically over the steel wire 1_0 wrapped helically at the same time, so that each subsequent convolution of the upper tape _4 overlaps the edge of the preceding convolution, bonding the edges of the lower tape 3_. The upper tape 4 touches the wire 1_0 with the glue layer and is simultaneously pressed to the glue layer of the lower tape 3_^ forming a continuous double-layer pipe having bending capability V2_ shown on the section on fig. 4. The contact of the upper tape 4_ with the wire 1_0 takes place approximately in the middle of the upper tape _4.

As shown on fig. 6, a modification of the manufacturing method of the pipe having bending capability from one tape 3_ consists in unwinding the tape 3_ from a reel 2_ made of metallized polyesther foil. The tape _3 is conducted with constant speed over the guide rolls 5 to the gluer where the upper side of the tape 3_ is covered with a glue layer and the excess of the solvent is evaporated from the glue layer in the dryer 1_ . The tape _3 with the dried glue layer is then wrapped onto the head, glue layer up. Simultaneously, the wire 1_0 is unwound from the reel 9_ and wrapped helically over the tape convolution 3_^ in the bonding place, approximately in the middle of the glue layer of the tape 3_^. The tape 3_ with the glue layer on the upper side is wrapped helically over the head 1JL in such a way that each subsequent tape convolution 3_ overlaps approximately to the middle of the preceding convolution. Each subsequent tape convolution 3_ has contact with the glue layer found on the preceding convolution and with the wire 1_0 which is found on the glue layer of the preceding convolution and is pressed thereto in order to be glued. In such a way a continuous, double-layer pipe having bending capability 1_2 is made from one tape ,3 ^as shown in a section on fig. 8.

As shown on fig. 5 the pipe having bending capability 12 formed of two tapes: lower 3_ ^anc^ upper 4_ and on fig. 9, the pipe having bending capability _12_^ formed of one tape 3_ are in their variants equipped with the pipe wrapping ,1_3 made of glass wool. The pipe wrapping 1_3 is mounted on the perimeter of the outer coating of the the pipe having bending capability 1_2 and is secured all over its length before sliding with a clip band 1_4 made of the flexible mesh. The pipe having bending capability _12_. together with the pipe wrapping 1_3 in the clip band 14_ are placed in a flexible sleeve 1_5 made of polyethylene foil which constitutes the outer coating of the pipe having bending capability 12.

Claims

Patent claims

1. The manufacturing method of a pipe having bending capability (_12) which consists of a mesh reinforcement made of wire (1_0) and a flexible coating from the lower (_3) and upper (_4) tapes, characteristic for the fact that both the lower (3_^) and the upper (4_) tapes unwound from the reels

(1_) and ( 2 ) are covered with a glue layer on one side, both made of foil, preferably polyesther, subsequently the upper tape (4 is turned over so that glue layers of both tapes are facing each other, wherein the lower tape (_3) and the upper tape (_4) whose glue layers face each other are positioned so as to the lower tape ( 3 ) is above the upper tape (^ ) and the upper tape ( 4_) is displaced horizontally with respect to the lower tape (.3) , subsequently steel wire

(10) unwound from a reel (^) is introduced between the lower ( 3_) and upper tapes (_4) , then the lower tape (_3) with a glue layer on the upper side, the wire (1_0) and the upper tape (_4) with a glue layer on the lower side are wrapped helically over the head, so that each subsequent convolution of the lower tape (_3) overlaps the preceding convolution bonding the edges of the lower tape (_3) together and in over the bonding place of the edges of the lower tape (.3) , the steel wire (1_0) is wrapped helically approximately in their middle, wherein the upper tape (4) with a glue layer on the lower surface is wrapped helically over the helical steel wire (1_0) , so that each subsequent convolution of the upper tape (4_) overlaps the edge of the preceding convolution bonding the edges of the upper tape (4_) , while the upper tape (4_) touches the glue layer by means of the wire ( TL O) which is simultaneously pressed to the glue layer between the bonded edges of the lower tape (_3) wrapped helically, wherein the place of contact between the upper tape (4_) with the wire (1_0) is approximately the middle of the upper tape (_4) .

2. The manufacturing method of a pipe having bending capability (_12) which consists of a mesh reinforcement made of wire (_10_) and a flexible tape coating (3_) , characteristic for the fact that that the polyesther tape ( 3_) unwound from the reel (2_) , preferably metallized is covered on one side by a glue layer, wherupon it is wrapped helically over the head (11_) with the glue layer facing up, and when the tape (3_) is being helically wrapped, then simultaneously the wire (1_0) unwound from a reel (9) starts to be helically wrapped, wherein the wire (1_0) is being wound on the edge of the tape convolution (_3) covered by a glue layer, in the place corresponding to approximately the middle of that layer, wherein the next tape convolution (3_) is wrapped on the tape convolution (_3) covered by a glue layer and the wire ( 1_0) , whereas the opposite side without a glue layer covers the edge of the tape convolution (3_) with a glue layer and the wire (Kj_.) and both tape edges (_3) together with the wire (K^) placed between them are after pressing, bonded to form a continuous, double-layer pipe having bending capability (_12_) .

3. The pipe having bending capability (1_2) which comprises the mesh reinforcement made of wire (10) and a flexible coating bonded thereto, characteristic for the fact that the flexible coating comprises two continuous coatings: outer and inner, between which a helically wrapped steel wire (JL_0_) is placed, wherein the outer coating is formed from a helically wrapped upper tape ( ) with a glue layer on the lower surface, while the inner coating is formed from a helically wrapped lower tape (3_) with a glue layer on the upper surface.

4. The pipe having bending capability ( 2) which comprises the mesh reinforcement made of wire (1_0) and a flexible coating bonded thereto, characteristic for the fact that the flexible coating is formed by the edges of helically wrapped, continuous tape convolutions (_3) ι between whose ends is the helically wrapped wire (1_0) .

5. The pipe having bending capability (1_2) according to claim 3 and 4, characteristic for the fact that it is equipped with a pipe wrapping (1_3) preferably of glass wool mounted on the perimeter of the outer coating of the pipe having bending capability ( Y2 ) and surrounded on its entire length by a band clip (1_4) preferably of a flexible mesh, wherein the pipe having bending capability (1_2) together with the pipe wrapping (1_3) is placed inside a flexible sleeve (L5) preferably made of polyethylene foil which forms the outer coating of the pipe having bending capability (12) .