CA1200665A - Method and device to produce coloured labelling strips on steel pipes sheathed with synthetic material - Google Patents
Method and device to produce coloured labelling strips on steel pipes sheathed with synthetic materialInfo
- Publication number
- CA1200665A CA1200665A CA000403988A CA403988A CA1200665A CA 1200665 A CA1200665 A CA 1200665A CA 000403988 A CA000403988 A CA 000403988A CA 403988 A CA403988 A CA 403988A CA 1200665 A CA1200665 A CA 1200665A
- Authority
- CA
- Canada
- Prior art keywords
- labelling
- strips
- foil
- polyethylene
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/17—Articles comprising two or more components, e.g. co-extruded layers the components having different colours
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
- B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
- B29K2705/08—Transition metals
- B29K2705/12—Iron
-
- 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
- B29L2009/00—Layered products
- B29L2009/003—Layered products comprising a metal layer
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
ABSTRACT
The invention relates to a method and a device to produce several circumferentially spaced labelling strips of polyethylene on the surface of steel pipes sheathed with polyethylene, the sheathing being formed by simultaneous extrusion of a tubular foil of ethylene copolymer serving as contact adhesive, and of a tubular polyethylene foil lying over it, using an extruder head with two ring channels. In order to be able to apply coloured labelling strips onto the sheathing in the longitudinal direction during extruding of the tubular contact adhesive and sheath foil, it is proposed that for the sheath foil and the labelling strips polyethylene with certain melting indexes are used, and that the extruder pressure for the sheath foil or the labelling strips is kept at a pressure difference between 10 and 50 bar. The device is essentially characterized by the specific arrangement of the outlet openings for the labelling polyethylene on the outer ring slot.
The invention relates to a method and a device to produce several circumferentially spaced labelling strips of polyethylene on the surface of steel pipes sheathed with polyethylene, the sheathing being formed by simultaneous extrusion of a tubular foil of ethylene copolymer serving as contact adhesive, and of a tubular polyethylene foil lying over it, using an extruder head with two ring channels. In order to be able to apply coloured labelling strips onto the sheathing in the longitudinal direction during extruding of the tubular contact adhesive and sheath foil, it is proposed that for the sheath foil and the labelling strips polyethylene with certain melting indexes are used, and that the extruder pressure for the sheath foil or the labelling strips is kept at a pressure difference between 10 and 50 bar. The device is essentially characterized by the specific arrangement of the outlet openings for the labelling polyethylene on the outer ring slot.
Description
;5 The invention relates to a method and a device to produce several label strips of polyethylene, distributed over ~he cirCum~erencQ, on the surface of steel pipes sheathed with polyethylene.
For labelling pipes, cables and leads of solid material bus-bars *or the conduction of earth connections, the most di~erse methods are used. Thus, for example, simple labels with technical information or pictures and trademarks as advertisements,waterproo~ labels with the same texts or identification ~unc-tions, texts stencilled on with colouring mat~er ~water soluble or containing solvents), produced by a stamping process with colour inserts, longitudinal labels produced by spray painting are used, and also an ex*rusion can be made wi~h a colouring in a different shade from the base material.
Most of these methods do not produce weather-resistant labels or they fail on UV (ultraviolet) or temperature load with changing climatic conditions.
An object sheathed in synthetic material only remains durable over a long period of time if in addition it contains high W -stabilisers in the form of carbon black, acrylic acid ester admixtures or other UV-absorbing admixtures.
Mul~iply arranged~ linear strips, which are durable, stable to UV and heat and weather-resistant and are produced by colouring in the mos~ diverse way in a continuous operation in extruded form are unknown, if in addition at the same time an extruded adhesive lying beneath forms, and permanently guarantees, adhesion to the object which is to be sheathed.
The invention is based on the problem of creating a method and a de-vice with which it is possible, during the extruding of the tubular contact ad-hesive and sheathing foil, to apply coloured label strips in the longitudinal direction onto the sheathing, which make the purpose of the pipes laid in the ground distinguishable in every position. Th~ application should be such that the label strips are not completely pressed through the thermoplastic shcathing .~..i~
}t~;5 and that the physical and chemical properties of the sheathing are not impaired, Eor example by notch effec-ts, alteration of the elongation at rup-ture and of the chemical behaviour, through UV-radlation or heat.
The invention provides a method of applying a plurality of longitudinally extending labelling strips to the surface of a pipe simultaneously with sheathing the pipe with polye-thylene, wherein contact adhesive and a tubular polyethylene foil having a melting index i2 16= 0-4 to 0.5 g/10 min. are extruded over the pipe surface from a single extruder head; and wherein polyethylene labelling strips having a melting index i2 16= 0.6 to 0.9 g/10 min.
are extruded into the path of the tubular foil extrusion such that they appear on the outer surface of the foil but do not extend completely through the thickness thereof.
From another aspect, the invention provi~es a device for sheathing a pipe and simultaneously applying a plurality of longitudinally extending labelling strips to the sheathed surface thereof, comprising an extruder head having inner and outer ring slots through which to ex-trude respec-tively a contact adhesive and a tubular polyethylene foil, the ring slots being arranged concen-trically around an opening for the passage of a pipe -to be sheathed, wherein a distributor ring is mounted in the anterior housing wall of the extruder head which distributor ring defines a ring channel coupled to a duct extending through the anterior housing wall for the supply oE labelling polyethylene thereto, and has at least three circumferentially spaced passages extending from the channel to the boundary of the ring slot for the tubular foil extrusion.
With the double conical head extruder in the region of the smoothing zone, i.e. in the upper third o~ the outer ring slot (from which the sheath foil is extruded), an annular rim is pro-vided, with outlet openinys distributed over the circumference for the labelling polyethylene.
The fashioning of ex-truded labelling is limited in sheathing in width and depth, being continually impressed into the layer bearing the labelling. A raised lenticular or a plane design of the label can be achieved through corresponding pressure - difference regulation.
The fashioning is only solved by preventing a recessed penetration through the design of the distributor channels.
It was also found that a label polyethylene (abbreviated below as PE) in i2 16 must be close to the sheathing-PE to be labelled.
Example: Sheathing-PE 0.~ - 0.5 Label-PE 0.6 - 0.9 In the extruding process the UV- and heat-stabilized colorant must remain of fast colour. This task is all the easier, the less admixtures (copolymer of the PE) are present. In addi-tion, the possibility arises of designing the label fibres, heat-and UV-stabilized, not only with colouring, but phosphorescent as a luminous colour. With these steps the result is that the physical properties, tensile strength, rupture strength and elonga-tion at rupture remain fully maintained and comply with the accepted DIN.
The embodiments can be supplemented by the addition of an extruded in tracer thread which perfectly displays the identity of the object sheathed in i5 synthetic material.
The PE-selection made of the label-PE to the sheathing-PE allows pro-cessing and distribution of the label-PE-S without additional thermal insulation between the extruders, since the extruding process can be carried out at uniform temperature.
In the drawings, a preferred embodiment of the device according to the invention is represented, wherein:-Figure 1 is a longitudinal section through the extruder head and thepipe to be sheathed;
Figure 2 is a fragmentary longitudinal section to an enlarged scale through the anterior housing ring of the extruder head;
Figure 3 is a cross-section on the A - B of Figure 2; and Figure 4 is a partial longitudi.nal section in enlarged representation.
The extruder head used for the extruding of two tubular-shaped foils is known per se in accordance with the DE-PS lg 57 078 and consists of three housing rings. In this, a first housing ring 1 is designed integral with a mandrel 2. Viewed in the direction of working, an intermediate ring 3 connects axially to the housing ring 1, and forms a ring slot 5 with the conically taper-ing end section 4 of the mandrel 2 for the inner contact adhesive tube 19.
Also, between the intermediate ring 3 and the ring channel 6 a baffle ring 7 is fixedly and interchangeably arranged. ~hile the housing ring l serves to apply the inner contact adhesive tube 19 emerging from the ring slot 5 onto the pipe 17 which is to be sheathed, and for this purpose is connected to the inlet 8, a second housing ring 9 is arranged for the application of the outer polyethylene tube 18, is designed in a similar way to the housing ring 1, and is closely con-nected with the side of the intermediate ring 3 facing away from the latter.
The ring slot 5 opens out directly in front of the ring opening of a second ring slot lO, which is formed by the tapered outer surface of the intermediate ring 3 and by the inner surface of the housing ring 9 parallel to ~his. The ring slot 10 communicates with a ring channel 11, which is connected to a poly-ethylene inlet 12 and the cross-section of which, as with the housing ring 1, can be altered by means of a baffle ring 13. The housing ring 1, the intermedi-ate ring 3 and the housing ring 9 are connected with each other by bolts 1~.
Heating of the extruder head to operating temperature is effected by controllable heating elements 15.
In the front housing wall 9 of the extruder head a distributor ring 22 is arranged. This has a ring channel 21 (see Figure 2 and 3) in the region of the flattening zone, i.e. in the region of the upper third of the outer ring slot 18. This ring channel 21 is connected to a channel 20 which passes through the front housing wall 9 and serves for the supply of the labelling-PE's. As can be seen from Figure 3, the distributor ring 22 ~in this example) has four outlet openings 23 uniformly distributed over the circumference, which open out in the upper third of the ring slot 10 (Figure 4). Thus, on extruding, four labelling strips are produced simultaneously and in this way it is ensured that in every pipe position at least one of the strips is visible.
For labelling pipes, cables and leads of solid material bus-bars *or the conduction of earth connections, the most di~erse methods are used. Thus, for example, simple labels with technical information or pictures and trademarks as advertisements,waterproo~ labels with the same texts or identification ~unc-tions, texts stencilled on with colouring mat~er ~water soluble or containing solvents), produced by a stamping process with colour inserts, longitudinal labels produced by spray painting are used, and also an ex*rusion can be made wi~h a colouring in a different shade from the base material.
Most of these methods do not produce weather-resistant labels or they fail on UV (ultraviolet) or temperature load with changing climatic conditions.
An object sheathed in synthetic material only remains durable over a long period of time if in addition it contains high W -stabilisers in the form of carbon black, acrylic acid ester admixtures or other UV-absorbing admixtures.
Mul~iply arranged~ linear strips, which are durable, stable to UV and heat and weather-resistant and are produced by colouring in the mos~ diverse way in a continuous operation in extruded form are unknown, if in addition at the same time an extruded adhesive lying beneath forms, and permanently guarantees, adhesion to the object which is to be sheathed.
The invention is based on the problem of creating a method and a de-vice with which it is possible, during the extruding of the tubular contact ad-hesive and sheathing foil, to apply coloured label strips in the longitudinal direction onto the sheathing, which make the purpose of the pipes laid in the ground distinguishable in every position. Th~ application should be such that the label strips are not completely pressed through the thermoplastic shcathing .~..i~
}t~;5 and that the physical and chemical properties of the sheathing are not impaired, Eor example by notch effec-ts, alteration of the elongation at rup-ture and of the chemical behaviour, through UV-radlation or heat.
The invention provides a method of applying a plurality of longitudinally extending labelling strips to the surface of a pipe simultaneously with sheathing the pipe with polye-thylene, wherein contact adhesive and a tubular polyethylene foil having a melting index i2 16= 0-4 to 0.5 g/10 min. are extruded over the pipe surface from a single extruder head; and wherein polyethylene labelling strips having a melting index i2 16= 0.6 to 0.9 g/10 min.
are extruded into the path of the tubular foil extrusion such that they appear on the outer surface of the foil but do not extend completely through the thickness thereof.
From another aspect, the invention provi~es a device for sheathing a pipe and simultaneously applying a plurality of longitudinally extending labelling strips to the sheathed surface thereof, comprising an extruder head having inner and outer ring slots through which to ex-trude respec-tively a contact adhesive and a tubular polyethylene foil, the ring slots being arranged concen-trically around an opening for the passage of a pipe -to be sheathed, wherein a distributor ring is mounted in the anterior housing wall of the extruder head which distributor ring defines a ring channel coupled to a duct extending through the anterior housing wall for the supply oE labelling polyethylene thereto, and has at least three circumferentially spaced passages extending from the channel to the boundary of the ring slot for the tubular foil extrusion.
With the double conical head extruder in the region of the smoothing zone, i.e. in the upper third o~ the outer ring slot (from which the sheath foil is extruded), an annular rim is pro-vided, with outlet openinys distributed over the circumference for the labelling polyethylene.
The fashioning of ex-truded labelling is limited in sheathing in width and depth, being continually impressed into the layer bearing the labelling. A raised lenticular or a plane design of the label can be achieved through corresponding pressure - difference regulation.
The fashioning is only solved by preventing a recessed penetration through the design of the distributor channels.
It was also found that a label polyethylene (abbreviated below as PE) in i2 16 must be close to the sheathing-PE to be labelled.
Example: Sheathing-PE 0.~ - 0.5 Label-PE 0.6 - 0.9 In the extruding process the UV- and heat-stabilized colorant must remain of fast colour. This task is all the easier, the less admixtures (copolymer of the PE) are present. In addi-tion, the possibility arises of designing the label fibres, heat-and UV-stabilized, not only with colouring, but phosphorescent as a luminous colour. With these steps the result is that the physical properties, tensile strength, rupture strength and elonga-tion at rupture remain fully maintained and comply with the accepted DIN.
The embodiments can be supplemented by the addition of an extruded in tracer thread which perfectly displays the identity of the object sheathed in i5 synthetic material.
The PE-selection made of the label-PE to the sheathing-PE allows pro-cessing and distribution of the label-PE-S without additional thermal insulation between the extruders, since the extruding process can be carried out at uniform temperature.
In the drawings, a preferred embodiment of the device according to the invention is represented, wherein:-Figure 1 is a longitudinal section through the extruder head and thepipe to be sheathed;
Figure 2 is a fragmentary longitudinal section to an enlarged scale through the anterior housing ring of the extruder head;
Figure 3 is a cross-section on the A - B of Figure 2; and Figure 4 is a partial longitudi.nal section in enlarged representation.
The extruder head used for the extruding of two tubular-shaped foils is known per se in accordance with the DE-PS lg 57 078 and consists of three housing rings. In this, a first housing ring 1 is designed integral with a mandrel 2. Viewed in the direction of working, an intermediate ring 3 connects axially to the housing ring 1, and forms a ring slot 5 with the conically taper-ing end section 4 of the mandrel 2 for the inner contact adhesive tube 19.
Also, between the intermediate ring 3 and the ring channel 6 a baffle ring 7 is fixedly and interchangeably arranged. ~hile the housing ring l serves to apply the inner contact adhesive tube 19 emerging from the ring slot 5 onto the pipe 17 which is to be sheathed, and for this purpose is connected to the inlet 8, a second housing ring 9 is arranged for the application of the outer polyethylene tube 18, is designed in a similar way to the housing ring 1, and is closely con-nected with the side of the intermediate ring 3 facing away from the latter.
The ring slot 5 opens out directly in front of the ring opening of a second ring slot lO, which is formed by the tapered outer surface of the intermediate ring 3 and by the inner surface of the housing ring 9 parallel to ~his. The ring slot 10 communicates with a ring channel 11, which is connected to a poly-ethylene inlet 12 and the cross-section of which, as with the housing ring 1, can be altered by means of a baffle ring 13. The housing ring 1, the intermedi-ate ring 3 and the housing ring 9 are connected with each other by bolts 1~.
Heating of the extruder head to operating temperature is effected by controllable heating elements 15.
In the front housing wall 9 of the extruder head a distributor ring 22 is arranged. This has a ring channel 21 (see Figure 2 and 3) in the region of the flattening zone, i.e. in the region of the upper third of the outer ring slot 18. This ring channel 21 is connected to a channel 20 which passes through the front housing wall 9 and serves for the supply of the labelling-PE's. As can be seen from Figure 3, the distributor ring 22 ~in this example) has four outlet openings 23 uniformly distributed over the circumference, which open out in the upper third of the ring slot 10 (Figure 4). Thus, on extruding, four labelling strips are produced simultaneously and in this way it is ensured that in every pipe position at least one of the strips is visible.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of applying a plurality of longitudinally extending labelling strips to the surface of a pipe simultaneously with sheathing the pipe with polyethylene, wherein contact adhesive and a tubular polyethylene foil having a melting index i2 16= 0.4 to 0.5 g/10 min. are extruded over the pipe surface from a single extruder head; and wherein polyethylene labelling strips having a melting index i2,16= 0.6 to 0.9 g/10 min. are extruded into the path of the tubular foil extrusion such that they appear on the outer surface of the foil but do not extend completely through the thickness thereof.
2. A method according to Claim 1 wherein the labelling strips are each extruded in a width of substantially 8 mm and a thickness of 50 to 100u.
3. A method according to Claim 1 or Claim 2 wherein the labelling strips are extruded at a pressure of substantially 100 bar and the sheath foil at a pressure of substantially 150 bar.
4. A method according to Claim 1 or Claim 2 wherein the labelling strips are extruded at a pressure of 130 to 140 bar and the sheath foil at a pressure of substantially 150 bar, the strips having a lenticular cross section.
5. A method according to Claim 1 or 2 wherein one UV- and heat-stabilized colourant is added to the material of the labelling strips.
6. A method according to Claim 1 or 2 wherein a phosphore-scent colourant is added to the material of the labelling strips.
7. A device for sheathing a pipe and simultaneously apply-ing a plurality of longitudinally extending labelling strips to the sheathed surface thereof, comprising an extruder head having inner and outer ring slots through which to extrude respectively a contact adhesive and a tubular polyethylene foil, the ring slots being arranged concentrically around an opening for the passage of a pipe to be sheathed, wherein a distributor ring is mounted in the anterior housing wall of the extruder head which distributor ring defines a ring channel coupled to a duct extending through the anterior housing wall for the supply of labelling polyethylene thereto, and has at least three circumferentially spaced passages extending from the channel to the boundary of the ring slot for the tubular foil extrusion.
8. A device according to Claim 7 when the distributor ring is located in the upper third of the outer ring slot.
9. A device according to Claim 8 wherein the distributor ring is received in an annular slot formed in the anterior housing wall of the extruder head.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3122043A DE3122043C2 (en) | 1981-05-29 | 1981-05-29 | Method for sheathing a steel pipe |
| DEP3122043.6 | 1981-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200665A true CA1200665A (en) | 1986-02-18 |
Family
ID=6133829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000403988A Expired CA1200665A (en) | 1981-05-29 | 1982-05-28 | Method and device to produce coloured labelling strips on steel pipes sheathed with synthetic material |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5833439A (en) |
| AT (1) | AT384990B (en) |
| BE (1) | BE893344A (en) |
| CA (1) | CA1200665A (en) |
| CH (1) | CH656090A5 (en) |
| CS (1) | CS229932B2 (en) |
| DD (1) | DD202118A5 (en) |
| DE (1) | DE3122043C2 (en) |
| FR (1) | FR2506664B1 (en) |
| GB (1) | GB2099357B (en) |
| HU (1) | HU183940B (en) |
| IT (1) | IT1151169B (en) |
| NL (1) | NL8202038A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3147709C2 (en) * | 1981-11-27 | 1984-12-06 | Mannesmann AG, 4000 Düsseldorf | Extruder head for sheathing a steel pipe |
| SE446954B (en) * | 1985-03-12 | 1986-10-20 | Uponor Ab | SET FOR EXTRUDING A DOUBLE WALL PLASTROR AND EXTRACTING TOOL FOR EXTENDING THE SET |
| JPS62242199A (en) * | 1986-04-11 | 1987-10-22 | Takeuchi Press Kogyo Kk | Cryogenic liquefied gas charger |
| DE3709411A1 (en) * | 1987-03-21 | 1988-09-29 | Huels Troisdorf | METHOD AND DEVICE FOR PRODUCING WOOD MASK STRUCTURAL-LIKE THICK LAYERS BY COEXTRUSION |
| GB2208310B (en) * | 1987-07-22 | 1991-09-18 | Andrew Palmer & Associates Lim | Improvements in or relating to the identification of pipeline sections |
| DE3741627C1 (en) * | 1987-12-04 | 1988-12-15 | Mannesmann Ag | Process for the continuous sheathing of steel pipes with plastic |
| FR2643854B1 (en) * | 1989-03-02 | 1991-10-04 | Nortene Sa | MARKING GRID AND DEVICE FOR THE PRODUCTION THEREOF |
| DE4319697C2 (en) * | 1993-06-16 | 1995-03-30 | Vogelsang Ernst Gmbh Co Kg | Method and device for producing cable guide tubes |
| EP1916087A1 (en) * | 2006-10-26 | 2008-04-30 | Drossbach GmbH & Co. KG | Device for applying plastic to a workpiece |
| CN108340557A (en) * | 2017-12-29 | 2018-07-31 | 通鼎互联信息股份有限公司 | A kind of cable jacket double-layer coextrusion mold |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1080646B (en) * | 1957-12-06 | 1960-04-28 | Siemens Ag | Method for marking the insulation made of plastic for electrical lines |
| GB997212A (en) * | 1962-12-31 | 1965-07-07 | Ici Ltd | The production of striped thermoplastic extrudates |
| DE1957078C3 (en) * | 1969-11-10 | 1979-09-20 | Mannesmann Ag, 4000 Duesseldorf | Extruder head |
| DE7122606U (en) * | 1971-06-08 | 1972-08-31 | Vereinigte Draht U Kabelwerke Ag | Extruder head |
| DE2519046C3 (en) * | 1975-04-25 | 1979-08-23 | Mannesmann Ag, 4000 Duesseldorf | Method of applying a layer of polyethylene to a steel pipe |
| GB1601698A (en) * | 1977-08-20 | 1981-11-04 | Gen Eng Radcliffe | Extrusion method and apparatus therefor |
| US4248824A (en) * | 1979-01-24 | 1981-02-03 | Alcan Aluminum Corporation | Method and apparatus for striping extruded polymer products |
-
1981
- 1981-05-29 DE DE3122043A patent/DE3122043C2/en not_active Expired
-
1982
- 1982-04-08 AT AT0138482A patent/AT384990B/en not_active IP Right Cessation
- 1982-05-14 FR FR8208474A patent/FR2506664B1/en not_active Expired
- 1982-05-18 DD DD82239959A patent/DD202118A5/en unknown
- 1982-05-18 NL NL8202038A patent/NL8202038A/en not_active Application Discontinuation
- 1982-05-19 IT IT8221356A patent/IT1151169B/en active
- 1982-05-25 JP JP57088708A patent/JPS5833439A/en active Pending
- 1982-05-27 CS CS823919A patent/CS229932B2/en unknown
- 1982-05-28 GB GB8215803A patent/GB2099357B/en not_active Expired
- 1982-05-28 HU HU821743A patent/HU183940B/en not_active IP Right Cessation
- 1982-05-28 CA CA000403988A patent/CA1200665A/en not_active Expired
- 1982-05-28 CH CH3337/82A patent/CH656090A5/en not_active IP Right Cessation
- 1982-05-28 BE BE0/208211A patent/BE893344A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| BE893344A (en) | 1982-09-16 |
| GB2099357B (en) | 1985-04-03 |
| JPS5833439A (en) | 1983-02-26 |
| HU183940B (en) | 1984-06-28 |
| CH656090A5 (en) | 1986-06-13 |
| GB2099357A (en) | 1982-12-08 |
| IT1151169B (en) | 1986-12-17 |
| IT8221356A0 (en) | 1982-05-19 |
| NL8202038A (en) | 1982-12-16 |
| CS229932B2 (en) | 1984-07-16 |
| AT384990B (en) | 1988-02-10 |
| DE3122043C2 (en) | 1984-06-14 |
| ATA138482A (en) | 1987-07-15 |
| DD202118A5 (en) | 1983-08-31 |
| FR2506664A1 (en) | 1982-12-03 |
| DE3122043A1 (en) | 1982-12-16 |
| FR2506664B1 (en) | 1986-07-18 |
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| MKEX | Expiry | ||
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