DE2738982A1 - PROCESS FOR MANUFACTURING A FLANGE BAND ON PLASTIC PIPES - Google Patents

Description

CHEMISCHE WERKE HÜLS AG - RSP PATENTS -

U 370 Mari, 29.08.77 7468 / Sy

Our sign; O.Z. 2986

V processes for the production of a flange collar on plastic pipes

22/77

3 drawings

909811/0099

OZ 298 6 29.08.77

The invention relates to a method for producing a flange collar on plastic pipes, which are made with the same pipes are to be releasably connected, with a reinforcement in the region of the flange around the pipe end provided with a flange edge made of a fiber-reinforced material that is glued to the end of the pipe Binder plastic is provided, the outer surface of which is shaped according to the required contour.

A method for producing a flange collar as at the beginning described, is known from FR-PS 1 5 ^ 0 772. According to the In the known method, the state of the art is the end of a pipe without a flange ring, first on the outside with glass fiber reinforced polyester reinforced and cut to the desired length. Then the end of the pipe with the help of a special bushing calibrated. An inner sleeve made of thermoplastic material is pushed into the pipe and heated with the help of a Tool turned over the desired width of the flange. Then the reinforcement is made of polyester using glued on a press.

The inner sleeves are twisted off before gluing in order to ensure a snug fit. This relatively complicated ilei-STEL Imigsverfahren that also the use of several parts and expensive special tools due _f makes the manufacture of the pipe ends considerably. There is also the risk that the adhesive layer will be destroyed in the event of extreme chemical and mechanical stress and the pipeline will be interrupted.

In relation to this state of the art, the task arises Specify a method for producing the flange collar, which manages with less complex shapes and tools, the one ensures high tensile strength of the flange connection and also optimally utilizes the existing material of the pipe, which can still be used simply and inexpensively and that

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in particular only tools are required that are not separately heated have to verden. The same shape can be used by inserting Spacer rings between the ejector plate (7) and the pipe end piece Vary the flange collar thickness according to the desired compressive strength in the overpressure or underpressure range. This object is achieved by using a: a method of production of a flange, which is characterized by the following process steps is:

a) Wrapping of the tube end provided with a Planschonkranz with one with hardening, with the plastic of the Flexible mat impregnated with the pipe with adhesive bonding (binder) until a bead reaches around the end of the pipe made of binder plastic, reinforced by the mat is"

b) Pressing the bead around the rim in the die and plastering the face of the flange ring.

The method according to the invention accordingly comprises the step of the so-called hand lay-up method with subsequent wet pressing Room temperature, for just simple shapes out of plastic Find application. It doesn't require expensive tools made of metal to be used with heating devices. The flange connection produced according to the process withstands the highest requirements, d. H. high pressures with simultaneously occurring higher temperatures. By wet pressing it is also possible to use the flange collar to be built up entirely from a chemically resistant protective layer, including the flange faceplate.

To reach the bottle-shaped bead around the end of the pipe, preferably suggested that the pipe end with polyester geträiikteri To wrap staple glass fiber mats, initially wrapping a single mat with a width equal to the height of the die exceeds, then one after the other more soaked mats to wrap with different widths until one is about has formed a bottle-shaped bead.

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08/29/77

As a Birider-Kuus ts tof Γ therefore, much known per se, hardening polyester resins are used. Such polyester resins are described in Ullniauns Encyklopadie der Technischen Chemie, Dand lh, page 90 ff (1963) and in Kirk-Othnier, Encyclopedia of Chemical Technology, Volume 20, page 791 rf (196y;). A glass staple fiber is used as a glass mat to ^ 50 g / m "and all plastic materials, duromers and also elastomers for linings are used as plastics for the inner tubes.

did and a glass tapelfasermat (h ^ O g / ni * ~) of different widths used as glass mat for the purpose of shaping the VuI-stes to be pressed.

The invention also relates to a flanged plastic pipe, manufactured according to your inventive method and has a glass fiber reinforcement in the area of the collar collar, GeinäO invention rubbed a flange rim at the end of the pipe also the reinforcement of the actual composite robe in one firmly connected to the pipe end, penetrating or penetrating all parts üj "?. ι .etumcie h <Mflo« -e «t; plastic layer is embedded and the Ilnute.il can accordingly be considered isotropic in its entirety, including the reinforcement.

Furthermore, the face of the flange can be made with Diehtrilleri be provided so that the flange connection also high pressures can withstand with appropriate insertion of seals.

Further properties of the flange collar and the method according to Invention are explained with reference to the drawing. The figures in the drawing show:

Figure 1: a pipe end made of PVC-C, with a bottle ring and a pre-armor; (GF-UP) provided i «'j

Figure 2: the pipe end with a bead short vav d "M

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Figure 3i the pipe end within a die during the Pressing process, shortly before the end of the first closing interval;

Figure 4: a flange collar after completion on a PVC-C pipe.

In Figure 1, a plastic pipe 1, consisting of PVC-C, is shown. It can also be used for the method according to the invention other plastic pipes are used, for example from Rigid PVC, made of polyolefins and duromers, preferably GF-UP. The tube has, for example, a diameter of 450 mm, where it turns out that the process is very flexible and is therefore suitable for pipes between 20 and 700 mm in diameter.

First, a flange ring 2 is welded on in the area of the end edge (Weld 3) · This can also be thermally pulled around using a special tool. The blank is then wrapped with a first polyester-soaked glass staple fiber mat '+, in such a way that it is so high around the neck is wrapped so that it protrudes from the mold used later. A gap of 0.2 to 0.6 min between Outside diameter of the pre-reinforcement with the mat '4 and smallest The inner diameter of the upper part of the molding tool 13 is maintained. Further layers of glass silk mat of different widths (50 and 70 mm for pipes) are then added to the end of the pipe up to nominal size 200, or 70 and 90 mm for pipes up to nominal size 700) wrapped. It is basically in the following order wrapped: three layers of narrow tape, then three Lay wide tape and continue in this order until a bead 5 has formed (see Figure 2). In the end this will be with two mat layers of such width still covered that no shifting or from the outside when moving the mold together Folding the underlying mat strips is possible.

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The polyester resin is a plastic that bonds to the pipe with an adhesive and hardens in the air. Its viscosity is to be adjusted as it is for the "hand lay-on" process is required (viscosity value 680 mm / see). Such resins are known per se.

After winding, the pipe end is placed in a die according to FIG brought in. The die consists of two polyethylene parts which, as is known per se, are adapted to the requirements. The die contains an ejector plate 7 with an ejector 6 on which the end of the pipe is set up. The end is surrounded by a circular die shape 8, which is below the viewpoints 7 and has resin receiving grooves 9 »10 in its cheek area. the The male part 13 has on its underside a pressure ring 11 which widens obliquely outward and which has eight groove-shaped ventilation channels 12 incorporated. When lowering the male mold 13 Care must be taken that this happens at intervals, whereby the pressing force does not exceed the value of 1,000 kp may, and that the pressing process is finished after 15 minutes, but should not be finished shorter than within 10 minutes in order to ensure that the mat strips are embedded in such a way that they can be the pressed bead then behaves as an isotropic material. The pressure ring of the male part penetrates along the bead and presses this so that an approximately frustoconical outer contour (bottle shape) of the bead is achieved. Due to the close tolerance Between the pipe end piece and the male mold, only excess resin is pressed away into the resin channels, this facilitates the theoretical Determination of the glass fiber content and thus allows conclusions to be drawn about the strength behavior.

Usually the die remains closed until the polyester resin is cured. After waiting for this period, the die pulled apart and the pipe end removed. The heat released during the polymerization reaches the end of the pipe short-term peak temperatures of up to 100 C and more, what

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leads to good crosslinking of the polyester resin. The residual styrene content contained in it is well below $ 1, ^wa s equivalent to a good chemical resistance and allows high mechanical values. The end of the pipe has to be cleaned after removal. In particular, the free end face 18 of the flange ring must be exposed. To improve the sealing properties, sealing rings 19 are screwed into the end faces. After cleaning, the flange collar is to be used, whereby a high degree of dimensional accuracy is guaranteed.

In order to be able to roughly indicate the mechanical strength of the flange connection, burst tests and tensile tests were carried out :

1. Three first tests at approx. 20 C and a pipe with a diameter of 500 mm and a collar height of 55 mm. Only when h $ to 55 barg, the test tubes in most spigot.

2. Three Versuohsrohre at approx. 90 C and one pipe with one Diameter ^ 50 min and collar height of 52.5 n »" · At 55 bar The test pipe in the collar collar burst every time overpressure.

3. In a burst test at 90 C and a pipe with the diameter The flat seal slipped 110 mm at 100 bar overpressure out; When using inlay rings with a round cord as a seal, bursting pressures of 160 bar could be achieved will.

H. In the case of a pipe with a diameter of 160 mm, the flat seal slipped out at 90 C and 100 bar overpressure. The last two tests show that the flat seal between two smooth contact surfaces fails at high pressures. Sealing grooves were therefore screwed into the face of the flange connections.

Tensile tests on finished fittings showed that tensile forces of 11,500 kg to 13,500 kg on pipes with a diameter of 110 min became. This corresponds to a theoretical tensile strength nucleus of T = 1,000 kg / cm.

909811 / 0JD99

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Claims (2)

O.Z. 2Q86 8/29/77 claims 1. Process for producing a flange collar on plastic pipes that can be detachably connected to the same pipes, with the flange uir: the one with a Flanged pipe end around a reinforcement made of a fiber-reinforced, with the pipe end glued connecting binder plastic is provided, the outer surface is shaped according to the required contour, characterized by the following process steps: a) Wrapping the end of the tube with a hardening, adhesive connecting to the plastic of the pipe Flexible mat soaked in plastic (binder) until a bead (5) made of binder plastic extends around the end of the pipe, reinforced by the mat, j b) Pressing the bead around the rim in the die and clearing the face of the flange rim. 2. The method according to claim 1, characterized by wrapping the pipe end with polyester-impregnated glass staple fiber mats, whereby first a single mat (h) with a width that exceeds the height of the die is wrapped, then further impregnated mats with different widths are wrapped one after the other until an approximately flaschenförrnigor bead has formed. 3 · Flanged plastic pipe with glass fiber reinforcement in the area of the collar, produced by the method according to claims 1 and 2, characterized in that at the end of the pipe next to a flange collar (2) also the reinforcement into one with the pipe end firmly connected, penetrating parts or covering plastic layer entered; to t is. 909811/0099 ORIGINAL INSPECTED (KZ. 2986 08/29/77 k. Plastic pipe according to claim 3> characterized in that the end face (i8) of the flange ring is provided with you trills (19). 9098 1 1/0099