Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1993-10-01
1995-05-02
Maki, Steven D.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
138109, 156189, 156195, 15624413, 15624427, 156267, B29C 5362, B29C 5382
Patent
active
054116198
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for manufacturing a joint pipe from a spirally wound thermoplastic profile at an end of a thermoplastic pipe.
The invention is characterized by the following steps: substantially cylindrical end section corresponding to the inner diameter of the pipe end, which end section transfers via a radial stop surface corresponding to the wall thickness of the pipe end into a slightly weakly conical section, overlapping around the conical section of the mandrel commencing from that end of the mandrel, which is furtherest removed from the pipe end, and continuing inwardly forward and over the pipe end, pipe end is reached, the extruder is stopped while the mandrel and pipe continuously rotate, and
Other characteristics of the invention are described hereinafter.
The invention is next described in more detail with reference to the accompanying drawings, in which
FIG. 1 shows a scheme representation of a joint pipe manufactured according to the present invention,
FIG. 2 shows another example of a joint pipe manufactured according to the invention, and
FIG. 3 and 4 show alternative applications of the joint pipe of FIG. 2.
When manufacturing a joint pipe 1, a rotatably driven, heated mandrel 2 with a substantially cylindrical end section 3 is used, upon which a pipe end 4, which is to be provided with the joint pipe 1, is applied. The cylindrical end section 3 has an outer diameter, which corresponds substantially to the inner diameter of the pipe end 4. A radially directed stop surface 5 is between the outer surface of the cyclindrrical end section 3 and the outer surface of a conical main section 6. The end surface of the pipe end 4 is intended to be located against this stop surface 5 during the entire manufacturing process, therefore, the width of the stop surface 5 preferably corresponds to the wall thickness of the pipe end 4 so that a transition as uniform as possible is obtained between the outer surface of the pipe end 4 and the conical main section 6 of the mandrel 2. After the pipe end 4 is applied onto the cylindrical section of the mandrel 2, the mandrel 2 is continuously maintained in rotation and heated up to at least about 100.degree. C. When the mandrel 2 has reached a desired temperature, a melt profile 7 of thermoplast is extruded onto the main section 6 of the rotating mandrel, starting at that end of the mandrel 2, which is located farthest away from the pipe end 4. The extrusion is preferably carried out with an extruder nozzle 8 of a substantially rectangular cross-section, which extruder nozzle 8 may be moved in an axial direction along the mandrel 2. Movement of the extruder nozzle 8 in a direction against the pipe end 4 occurs synchronically with the rotational speed of the mandrel 2 such that the extruder nozzle 8 for each rotation of the mandrel 2 moves in the direction toward the pipe end 4 a distance slightly less than the width of the melt profile such that a certain overlapping is obtained. In this way, a spiral winding of the melt profile 7 around the mandrel 2 and pipe end 4 is obtained, with winding turns located tightly one above the other such that a welding-together of the melt profiles is obtained. For improving the welding together and for obtaining a more uniform surface on the joint pipe, the overlapping is pressed down with a rotating roll 11, which follows the extruder head. The extrusion continues until a desired overlapping between the melt profile 7 and the pipe end 4 is obtained, after which the extruder is stopped, while the rotation of the pipe end 4 and the mandrel 2 may continue. Thus, a uniform transition in the material thickness between the mantle of the pipe end 4 and the joint pipe 1 is obtained.
When the extrusion is stopped, the thermoplastic material in the joint pipe 1 is cooled down by spraying cooling water from the outside upon the extruded joint pipe 1. When the thermoplast material has set, the free end of the joint pipe 1 is cut uniform with a rotating knife 9, whereby an absolutely uniform surface is obtained. F
REFERENCES:
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patent: 3240645 (1966-03-01), Friedwald et al.
patent: 3243328 (1966-03-01), Britton et al.
patent: 3466383 (1969-09-01), Decker
patent: 3706624 (1972-12-01), Rinker
patent: 3969170 (1976-07-01), Landgraf
patent: 4062717 (1977-12-01), McClean
patent: 4724111 (1988-02-01), Iwata et al.
patent: 4826423 (1989-05-01), Kemp et al.
Webster's II New Riverside University Dictionary, 1984, p. 1261.
Blomqvist Gunnar
Sundqvist Kristian
Maki Steven D.
OY Kwh Pipe AB
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