NL8203087A - Plastics pipe socket with non-adhesive ring - consisting of two components mixed by inserting other pipe to produce bonding adhesive - Google Patents

Abstract

The arrangement is for adhesively connecting the ends of two plastics pipes, e.g. of PVC or polyalkene, e.g. by inserting one pipe end into a socket at the end of the other pipe. The socket end is internally provided with an annular non-adhesive strip consisting of two components which, on insertion, are mixed to form an adhesive compatible with the material of the two pipes. One component may consist e.g. of a polyepoxy resin with incorporated accelerator, whilst the curing agent, e.g. an aliphatic or cycloaliphatic amine or polyamine, is contained therein in microencapsulated form, such that the agent is released under the pressure caused by insertion of the pipe end.

Description

825049 / vdV / kd I Short designation: Plastic pipe section I The Applicant mentions as inventor, Dhr. B. Lodder at Hardenberg.

The invention relates to a plastic pipe part in which a wall part of a pipe part which can be glued to another pipe part is provided with a substantially annular strip of non-stick material, consisting of a mixture of at least two separate components. which, when the separation is removed, form an adhesive layer that is compatible with the plastic material of the plastic pipe part and another pipe part.

Such a plastic pipe part in the form of a socket end, wherein the strip of material extends over the entire inner wall of the socket end, is known.

This known plastic pipe part has the drawback that the adhesive bond obtained often does not meet the desired sealing requirements.

The object of the invention is now to provide a plastic pipe part in which this drawback does not occur.

According to the invention, this object is achieved in that the ring-shaped strip is arranged substantially on the entrance side of the pipe section when forming a pipe connection.

In this way a very good adhesive bond is always obtained.

Namely, a very even adhesive layer is formed over the entire length of the inner wall of the socket end when inserting the penetrating pipe section, while moreover this ensures a good mixing between the two separate components, especially when one of the separate components is present in in the form of microcapsules.

A particularly good result is obtained if the strip of material on the resin is conical in shape when a pipe connection is formed.

The strip of non-sticky material is expediently applied to the inner wall of a socket end.

When such an annular strip of non-sticky material is used, such a strip can be pre-applied in the factory to the inner wall of a socket end or the outside of an penetrating pipe section and subsequently transported without expensive arrangements being made, since no contaminants can adhere to the non-sticky strip material of separated components.

On the other hand, when the separation is lifted, the two form 8203087

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M -2 -! Components separate an adhesive layer that is compatible with the plastic from the pipe part and from another or penetrating pipe part, where an optimum connection is made between a socket end and a penetrating pipe part inserted therein.

j 5; Advantageously, the mixing of the two separate components of the annular strip of non-stick material takes place under pressure.

The annular strip of non-tacky material is expediently arranged substantially on the entrance side of the pipe section, more particularly a socket end.

The plastic pipe part expediently consists of a thermoplastic plastic, preferably polyvinyl chloride or a polyolefin, such as polypropylene or polyethylene.

The strip of non-stick material expediently consists of one | component with capsules of a second component mixed therein, which is released when the capsules are broken under pressure.

According to an effective embodiment, the annular strip forms: non-stick material at least one revolution of a screw. Bee ; i; the use of such an annular strip is a very good one; ; l obtain adhesive bond.

Advantageously, the layer thickness of the annular strip of non-stick material is greater than half the difference between the inner diameter of the socket and the outer diameter of the pipe section connected to the socket end, so that an optimum glue connection is obtained over the entire length of the inside of the socket. socket end. It is expediently added to this; The volume of the strip of material substantially corresponds to the space between the inner side of the sleeve end and the inserted penetrating pipe section.

The invention also relates to a plastic pipe connection in which an penetrating pipe part is received in a socket end using a glue connection, which is characterized in that either pipe connection is obtained using a plastic pipe part according to the invention.

The invention will now be elucidated on the basis of an exemplary embodiment with the aid of the drawing, in which:

Fig. 1 shows a cross section of a plastic pipe part with socket end 35 according to the invention;

Fig. 2 a variant of such a plastic pipe part with socket end; Fig. 3 a still further variant of a plastic pipe part with socket end according to the invention;

Fig. 4 a plastic pipe part with socket end according to the invention 0203087! - 3 - .....................!

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in which an penetrating pipe section is included; and - fig. 5 a plastic pipe part without socket end.

Fig. 1 shows a plastic pipe part 1 with a sleeve 2.

On the inner wall 3 of the sleeve end 2, a part 4 of the length of the inner wall 3 of the sleeve 2 is provided with a strip 4 of non-sticky material, consisting of a mixture of at least two separate components, which, under the pressure mixing form an adhesive layer which is compatible with the plastic of the plastic pipe part 1 and therefore also of the plastic of the socket end 2 which forms one whole 10 with said pipe part.

The two separate components, of the strip of non-stick material, usually consist of one component in the unclosed state and another component in the confined state in the form of micro-capsules. When a penetrating pipe section 5 is penetrated, the; 15 micro-capsules are broken, allowing their contents to mix with the first component.

! Advantageously, the two separate components may consist of, for example, epoxy resins, one component forming the polyepoxy resin with the accelerator incorporated therein, while the hardener is in the form of micro-capsules which are broken under pressure and release their contents, thereby the desired curing is achieved. Obviously, it is also possible in other ways to separate the various components separately.

Suitable curing agents for epoxy resin components are aliphatic and cycloaliphatic amines and polyamines.

The adhesive is effectively a viscoelastic adhesive to allow a quick assembly.

The glue can also be an acrylic glue in capsules contained in a neutral lacquer layer.

In order to ensure a good glue connection between an penetrating pipe part and a socket end, it is recommended to ensure that the strip of material 4 on the front side 8 of the socket end has a greater wall thickness 6 than the wall thickness 6a on the opposite side 8a. of the sleeve end 2. The penetrating tube part will then take along a part of the too thick strip 6 and ensure a good uniform glue connection over the entire length of the sleeve end 2.

According to another effective embodiment as shown in Fig. 3, the strip of non-stick material consists of at least one 8203087

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rotation of a screw 7, which also makes a very good one! : 'can create a tight glue connection.

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Advantageously, the layer thickness of the annular strip 4 of non-stick material is greater than half the difference between the inner diameters; 5 of the socket end 2 and the outer diameter of the pipe section connected to the socket end.

Especially in this way a very good tight glue connection is obtained.

The pipe part 1 with socket end 2 advantageously consists of polyvinyl chloride, but polyolefins such as polypropylene or polyethylene are also suitable materials. However, it is also possible to use tube parts of fiber reinforced or non-reinforced or reinforced thermosetting resins such as epoxy or polyester resins.

As can be seen in Fig. 4, the volume of the strip of material 15 in the finished glue joint substantially corresponds to the space between the inner wall 3 of the sleeve end 2 and the associated insertion! penetrating pipe section 5.

The volume of the strip of non-stick material 4 substantially corresponds to the annular space, bounded by the inner wall 3 20 'of the socket end 2 and the extension of the outer wall 9 of the pipe part 1 connected to the socket end 2.

It goes without saying that the properties of the glue joint to be formed must not be influenced by a long storage time of the plastic pipe part with socket end.

Fig. 5 shows an penetrating tube part 5 which is provided with an annular strip 4 of a non-sticky material.

The penetrating pipe section 5 is provided with a beveled end 10.

The annular strip 4 can have a frusto-conical surface 11 on the entrance side.

8203087

Claims (9)

1. Plastic pipe part, wherein a wall part of a pipe part that can be glued to another pipe part is provided with a substantially annular strip of non-stick material, consisting of a mixture of at least two separate components 5 which, when the separation is lifted, form a forming an adhesive layer that is compatible with the plastic material of the plastic pipe part and another pipe part, characterized in that the annular strip is arranged substantially on the entrance side of the pipe part when forming a pipe connection. 10: Plastic pipe part according to claim 1, characterized in that the strip of material on the entrance side (8) of the pipe part (2) has a smaller internal diameter than on the opposite side (8a). 3. Plastic pipe part according to claim 1 or 2, characterized in that the strip of non-tacky material is conical in shape on its entrance side when forming a pipe connection. 4. Plastic pipe part according to claims 1-3, characterized in that the plastic pipe part which carries the annular strip of material on its inside is a socket end. Plastic pipe part according to claims 1 to 6, characterized in that the volume of the strip of material (4) substantially corresponds to the annular space, bounded by the inner wall (3) of a socket end (2) and the extension of the outer wall ( 9) of a pipe section (1) connected to the socket end. 6. Plastic pipe part according to one or more of the preceding claims, characterized in that the layer thickness of the annular strip (4) is greater than half the difference between the inner diameter of a socket end (2) and the outer diameter of the socket end (2). ) connected pipe section (1). Plastic pipe part according to one or more of the preceding claims, characterized in that the annular strip of material (7) forms one revolution of a screw. Plastic pipe part according to claims 1-6, characterized in that the pipe part is made of a thermoplastic plastic, in particular polyvinyl chloride or polyolefin or a reinforced 8203087 Λ> 1-. Μ - 6 -; i Thermosetting plastic exists. Pipe connection, comprising a plastic pipe part with socket end i and an penetrating pipe part incorporated therein, as well as a glue connection! between the sleeve end and the penetrating pipe part, characterized in that the pipe connection is obtained using a plastic pipe part according to one or more of the preceding claims. 8203087