CN1061293C - Electrofusion method and device - Google Patents

Electrofusion method and device Download PDF

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Publication number
CN1061293C
CN1061293C CN96198169A CN96198169A CN1061293C CN 1061293 C CN1061293 C CN 1061293C CN 96198169 A CN96198169 A CN 96198169A CN 96198169 A CN96198169 A CN 96198169A CN 1061293 C CN1061293 C CN 1061293C
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CN
China
Prior art keywords
pipe
sleeve pipe
heat welding
plastic materials
electric heat
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Expired - Fee Related
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CN96198169A
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Chinese (zh)
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CN1201416A (en
Inventor
O·卡茨
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Plasson Maagan Michael Industries Ltd
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Plasson Maagan Michael Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/735—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the extensive physical properties of the parts to be joined
    • B29C66/7352—Thickness, e.g. very thin
    • B29C66/73521—Thickness, e.g. very thin of different thickness, i.e. the thickness of one of the parts to be joined being different from the thickness of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B29C65/348—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic with a polymer coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Abstract

A method of joining a first pipe (P1) of a plastic material to a second pipe (P2) of a material which does not bond well to the plastic material, utilizes an electrofusion sleeve (2) of a plastic material which bonds well to the plastic material of the first pipe and having a first coil (6) of electrical heater wire on the inner surface at one end of the sleeve to receive the first pipe (P1) and a second coil (7) of electrical heater wire on the inner surface at the opposite end of the sleeve to receive the second pipe (P2). The opposite end of the sleeve includes a bonding material capable of producing a good bond, when activated by heat, between the materials of the sleeve (2) and of the second pipe (P2). The two pipes are inserted into the two ends of the sleeve, and electrical current is applied to the two coils to cause the first end of the sleeve to bond by electrofusion to the first pipe (P1), and the second end of the sleeve to bond by electrofusion and by the bonding material to the second pipe (P2).

Description

Electric heat welding method
The present invention relates to the electric heat welding art two or the many method and apparatus that pipe links together.
The electric heat welding art is a kind of known technology, for example F.P. 2,516, this technology is just arranged in 439, it links together two tubes by means of sleeve pipe, and the electric heating coil is housed in the sleeve pipe, after connected two tubes inserts the two ends of sleeve pipe, just in coil, switch on, be fused on the sleeve pipe with outer surface two tubes.This technology is widely used in connecting the pipe of making of same plastic materials, perhaps connects with different plastic materialss making but by means of the fine pipe adhered to one another of heat energy.In the case, the electric heat welding sleeve pipe can be used and the plastic tube identical materials is made, or with can by means of electric heat welding art and two kinds of plastic tubes can both fine bonding material.
But, under some application, needing to connect a kind of pipe of plastic materials, this material can not finely be bonded on the pipe of another kind of plastic materials or metal.For example, polyolefin such as polyethylene, polypropylene and polybutylene for example are difficult to be bonded on other material such as nylon (polyamide) and PVC, and therefore, the electric heat welding art still fails generally to use in these occasions.Consequently, concerning the pipe that can not finely be bonded to polyethylene on other plastics or the metal or other material, normally used is mechanical linking device.
The objective of the invention is to provide a kind of electric heat welding method and equipment, and it can be can not coupling together with the pipe that the plastic materials of other plastics or the fine bonding of metal tube is made usually.
One aspect of the present invention has provided a kind of connecting means, it can a kind of first pipe of plastic materials with can not couple together with second pipe of the material of the fine bonding of this plastic materials, this method comprises: an electric heat welding sleeve pipe (2) of making of plastic materials is provided, and this plastic materials is finely to be bonded to first pipe (P 1) plastic materials on, the first electric heating coil (6) is housed on the electric heat welding sleeve pipe internal surface at one end, in order to admitting first pipe, and the second electric heating coil (7) is housed on the internal surface of the sleeve pipe the other end, in order to admit second pipe; With first pipe (P 1) insert first end of electric heat welding sleeve pipe (2), and with second pipe (P 2) insert the other end of electric heat welding sleeve pipe; And to first (6) and second (7) electric heating coil feeding electric current, so that first end of sleeve pipe (2) is bonded to first pipe (P by means of electric heat welding 1) on, and make second end of sleeve pipe (2) be bonded to second pipe (P by means of electric heat welding 2) on.It is characterized in that, second pipe (P 2) insert that second end at sleeve pipe added a kind of binding material (7a, 17b) before second end of electric heat welding sleeve pipe (2), directly contact with it with the plastic materials of sleeve pipe (2), and when second pipe of sleeve pipe the other end admittance and this second pipe (P 2) material contact, this binding material (7a, 17b) can be at material and second pipe (P of sleeve pipe (2) when the hot activation that is energized 2) material between produce good bonding.
In a preferred embodiment, its further feature is, binding material is with the covering on the second electric heating coil wire, preferably the form of coating occurs; And in second embodiment, binding material is to occur with the form that covers the prefabricated membrane on the second electric heating coil, when second pipe inserts second end of sleeve pipe, in order to contact with second sleeve pipe.
The preferred material example that can be used to make two tubes is a polyolefin, is preferably the plastic materials of polyethylene as first pipe, and nylon (polyamide) is as the material of second pipe.Under such purposes, the also available polyethylene manufacturing of electric heat welding sleeve pipe.But the present invention also can use the plastic tube of other kind of material that can not mutual fine bonding, for example, does the material of first pipe with polypropylene, and/or makes the material of second pipe of other polar material.
It is the copolymer of basis with the polyolefin that the thermoplastic binding material is preferably what contain active polar group, this copolymer is after applying heat energy, will produce free radicals, free radicals will form bonding binding (bond) with any polar group that contacts with it or polar material then.A kind of such material is the copolymer of PE (polyethylene) and maleic anhydride, Maleic anhydride derives out with the maleic acid dehydration.Another kind is the copolymer of EVA and maleic anhydride.The commercial formulation of these materials is known to everybody.
The present invention also provides with the electric heat welding art plastic tube and another kind of plastic tube that can not fine bonding or the equipment that metal tube couples together.
Can understand additional features of the present invention and advantage from following description.
Only the present invention is described below with reference to accompanying drawings with example.Accompanying drawing has:
Fig. 1 is for illustrating vertical half-sectional view of a kind of electric heat welding sleeve pipe of making according to the present invention;
Fig. 2 is the partial enlarged drawing of the first electric heating wire coil structures of electric heat welding sleeve pipe one end in the explanatory drawing 1;
Fig. 3 is the partial enlarged drawing of the second electric heating wire coil structures of explanation electric heat welding sleeve pipe second end; And
Fig. 4 is the figure that the second electric heating wire coil structures improves situation in the explanatory drawing 3.
Electric heat welding accessory shown in Fig. 1 comprises: the electric heat welding sleeve pipe 2 of thermoplastic, one end have first plastic tube P of admittance 1Socket 3, the other end has admits second pipe P 2Socket 4, this second pipe will be connected to first pipe with the electric heat welding art and get on.Two sockets 3,4 preferably with an annular shoulder 5 (or other convex parts) separately, so that the restriction two tubes inserts the degree of depth of two sockets respectively, and make mutually coaxial being in a straight line of two tubes, also make the electric heat welding sleeve pipe coaxial with it and be in a straight line simultaneously.
Electric heat welding sleeve pipe 2 includes the first electric heating coil 6 on the internal surface of one end, in order to admit the pipe P that inserts socket 3 1, on the internal surface of its other end, include the second electric heating coil 7 (being preferably a section of coil 6), in order to admit the pipe P that inserts socket 4 2Also comprise tenminal block 8,9 on the sleeve pipe 2,,, thereby they are bonded together with the electric heat welding art with the internal surface and the outer surface of admitting the plastic tube of entering of fusing sleeve pipe in order to coil 6,7 turn-on current.
The structure and the state of electric heat welding accessory described above are though for the pipe that same plastic materials is made or belong to the connection that different materials is easy to the pipe that bonds with the electric heat welding art, be that everybody is familiar with.But, this technology generally is not used for connecting and is difficult for two kinds of plastic tubes bonding together with the electric heat welding art, for example polyolefin (as polyethylene) pipe and another kind difficult be that the pipe of nylon (polyamide) or other polar material or metal is connected with the material of polyethylene bonding.Electric heat welding accessory shown in Figure 1, the particularly structure of in Fig. 2-4, further describing, be used for making polyethylene pipe for example and discord polyethylene bonding usually specially another kind of material for example the pipe of polarity plastics or metal bond together become possible.
In the following embodiments, we set the pipe P that is received in the socket 3 1Be polyethylene pipe, and be received into the pipe P in the socket 4 2Be for example pipe done of nylon (polyamide) of other plastic materials, this material normally can not directly be bonded to P 1Pipe gets on.
In this embodiment, electric heat welding sleeve pipe 2 is also made with polyethylene.The coating of the electric heating wire of coil 6, marking in Fig. 2 and be 6a, also is the polyethylene of usefulness.Therefore, when feed electric current in coil 6 after, its polyethylene coating 6a is just at welding area Z 1In fusing, similarly, also melt in this zone on the adjacent surface of the pipe in sleeve pipe 2 and the socket 3, and at sleeve pipe 2, wire coating 6a with include plastic tube P in the socket 3 in 2Polyethylene between produce whole cohesive body.Welding area Z 1The Z at two ends 2And Z 3The district is colder zone, at this welding does not take place usually.
But, because pipe P 2Be to use not do usually, so winding socket 4 in order to admit pipe P with the material (being polyamide in the present embodiment) of polyethylene bonding 2The coil 7 that is positioned at sleeve pipe 2 the other ends, its structure and coil 6 is not exclusively the same.As shown in Figure 3, the wire of coil 7 is surrounded by outer 7a, is preferably the coating of binding material, and this coating can be at the polyethylene and the pipe P of sleeve pipe 2 after by the current activation in the coil 7 2Polyamide between cause good bonding to link.When external skin be contain active polar group be the copolymer of basis with the polyolefin time can give especially good results, this copolymer is when adding heat energy, will produce free radicals, free radicals will form the bonding binding with any polar group that contacts with it or polar material then.A kind of such material is the copolymer of PE (polyethylene) and maleic anhydride,
Figure 9619816900071
Maleic anhydride derives out with the maleic acid dehydration.Another kind is the copolymer of EVA (ethene-vinyl acetate copolymer) and maleic anhydride.
When coil 7 feeds electric current, its external skin 7a just is activated, at the polyethylene and the pipe P of sleeve pipe 2 2Polyamide between produce firm binder course, its position is in the welding area that buries coil 7, just is equivalent to sleeve pipe and admits pipe P 1One end buries the welding area Z of coil 6 1
This technology has also guaranteed coating 7a and coil metal line 7 bondings firmly better, thereby reduces or eliminated the possibility that occurs sewing passage between coating and the wire, and this sewing when being used for gaseous fuel is extrahazardous.
Fig. 4 illustrates a kind of work-around solution, wherein can make polyethylene and plastic tube P on the accessory 2Material (for example polyamide) between produce the binding material of secure bond, be to be prefabricated into the form of film that covers on the coil 7, as pipe P 2Just contact when inserting socket 4 with this pipe.
Therefore, shown in the local figure of Fig. 4, electric heat welding sleeve pipe 12 also resembles to be made with polyethylene above-mentioned, but does not have socket 4 to insert pipe P at sleeve pipe 2The wire of coil 17 of that end, also be with polyethylene making coatings (and without binding material), and used binding material is the performed thin film 17b that covers whole winding 17 sections.So the film 17b that binding material is done is used as polyethylene coating 17a and pipe P at this 2Plastics between the mating face.When coil 17 feeds electric current, polyethylene coating 17a is fusing just, thereby integrally is bonded on the polyethylene of sleeve pipe 12; Simultaneously the binding material of performed thin film 17b then becomes the hot activation state and at the Maranyl pipe P of polyethylene coating 17a and adjacency 2The surface between produce good bonding and link.
Self-evident, sleeve pipe 12 is admitted plastic tube P 1The sleeve structure and the loop construction of the other end, if P 1When being not polyethylene pipe, also can be as the work-around solution among above-mentioned Fig. 4.
As top described to Fig. 3 and Fig. 4, good binding between coil and the pipe can also fundamentally reduce the possibility that produces leakage way between coil and pipe, and this leakage is extrahazardous to the plastic tube of carrying superheated steam fuel.
Though the present invention describes according to two preferred embodiments, should be appreciated that this just for example, the present invention can also make a lot of other change, improvement and application.

Claims (10)

1. one kind first pipe (P of plastic materials 1) with can not be with second pipe (P of the material of the fine bonding of this plastic materials 2) method that couples together, this method comprises:
An electric heat welding sleeve pipe (2) of making of plastic materials is provided, and this plastic materials is finely to be bonded to first pipe (P 1) plastic materials on, the electric heat welding sleeve pipe is equipped with the first electric heating coil (6) on the internal surface of first end, in order to admitting first pipe, and the second electric heating coil (7) is housed on the internal surface of sleeve pipe second end, in order to admit second pipe;
With first pipe (P 1) insert first end of electric heat welding sleeve pipe (2), and with second pipe (P 2) insert second end of electric heat welding sleeve pipe; And
Feed electric current to first (6) and second (7) the electric heating coil, so that first end of sleeve pipe (2) is bonded to first pipe (P by means of electric heat welding 1) on, and make second end of sleeve pipe (2) be bonded to second pipe (P by means of electric heat welding 2) on, it is characterized in that: second pipe (P 2) insert that second end at sleeve pipe (2) added a kind of binding material (7a, 17b) before second end of electric heat welding sleeve pipe (2), so that it directly contacts with the plastic materials of sleeve pipe, and receive second pipe (P in sleeve pipe second termination 2) time contacts with the material of this second pipe, this binding material (7a, 17b) can be at material and second pipe (P of sleeve pipe (2) when the hot activation that is energized 2) material between produce good bonding.
2. the process of claim 1 wherein said second pipe (P 2) also be that plastic materials is made.
3. the process of claim 1 wherein that said binding material (7a) is to occur with the form of the covering on second electric heating coil (7) wire.
4. the method for claim 3, wherein said binding material (7a) are to be coated on the wire of the second electric heating coil (7).
5. the method for claim 2, wherein said binding material is the prefabricated membrane (17b) that covers on the second electric heating coil (7), as second pipe (P 2) when inserting second end of sleeve pipe (2), this film contacts with second pipe.
6. the process of claim 1 wherein that said first plastic materials is a polyolefin.
7. the method for claim 6, wherein said first plastic materials is a polyethylene.
8. the method for claim 6, wherein said binding material (7a, 17b) is that what to contain active polar group is the copolymer of basis with the polyolefin, this copolymer will produce free radicals after being applied in heat energy, the free radicals energy forms bonding with the polyolefinic polar group that contacts with binding material and links.
9. the method for claim 8, wherein said binding material (7a, 17b) is the polyethylene and ethylene copolymers that contains the maleic anhydride active component.
10. the process of claim 1 wherein and all are the manufactured materials of electric heat welding sleeve pipe (2) and the coating material of electric heating coil (6) wire and first pipe (P 1) identical plastic materials.
CN96198169A 1995-09-20 1996-09-18 Electrofusion method and device Expired - Fee Related CN1061293C (en)

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IL11536495A IL115364A0 (en) 1995-09-20 1995-09-20 Electrofusion method and device
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CN100451426C (en) * 2007-04-25 2009-01-14 钟世全 Low-carbon steel heating wire PE electric melting pipe fittings

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CN102042455A (en) * 2010-12-29 2011-05-04 广东联塑科技实业有限公司 Simple and easy hot melting technology for connection of PVC pipe
CN110657305A (en) * 2019-09-29 2020-01-07 谭连平 Combined sealing connection method for plastic pipes

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US4029837A (en) * 1975-08-14 1977-06-14 William C. Heller, Jr. Composite plastic-metallic bonding means and method
JPS59184611A (en) * 1983-04-05 1984-10-20 Showa Denko Kk High-frequency welding method of thermoplastic resin
WO1994024478A1 (en) * 1993-04-21 1994-10-27 N.V. Raychem S A Article and method for modifying the surface of a substrate

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Publication number Priority date Publication date Assignee Title
CN100451426C (en) * 2007-04-25 2009-01-14 钟世全 Low-carbon steel heating wire PE electric melting pipe fittings

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WO1997010944A1 (en) 1997-03-27
HK1016538A1 (en) 1999-11-05
AU6942596A (en) 1997-04-09
EP0851807A1 (en) 1998-07-08
AU702442B2 (en) 1999-02-18
NZ318060A (en) 1999-09-29
ZA967825B (en) 1997-03-20
IL115364A0 (en) 1995-12-31
PL180631B1 (en) 2001-03-30
PL325555A1 (en) 1998-08-03

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