CA1305597C - Method and apparatus for plastic impregnation and jacketing of wire ropes - Google Patents
Method and apparatus for plastic impregnation and jacketing of wire ropesInfo
- Publication number
- CA1305597C CA1305597C CA000580375A CA580375A CA1305597C CA 1305597 C CA1305597 C CA 1305597C CA 000580375 A CA000580375 A CA 000580375A CA 580375 A CA580375 A CA 580375A CA 1305597 C CA1305597 C CA 1305597C
- Authority
- CA
- Canada
- Prior art keywords
- wire rope
- plastic material
- jacket
- jacketing
- rope
- 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 - Lifetime
Links
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/02—Machine details; Auxiliary devices
- D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
- D07B7/145—Coating or filling-up interstices
-
- 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
- B29C48/06—Rod-shaped
-
- 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
- B29C48/156—Coating two or more articles simultaneously
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A method for single pass impregnation and jacketing of a wire rope comprises the steps of injecting plastic material in molten state into the wire rope under sufficient heat and pressure to fill the interstices between at least the outer strands of the rope, and directing the excess plastic material from the surface of the filled wire rope at the exit of the extrusion process to provide a jacket of plastic material integrally formed with the filled wire rope. The apparatus comprises an extruder for injecting the plastic material into the wire rope and a die located at the exit end of the extruder for removing the excess plastic material from the surface of the filled rope and subsequently redirecting it onto the surface of the wire rope to provide the jacket of plastic material.
Description
~3~
METHOD AND APPARATUS FOR PLASTIC IMPREGNATION AND JACKETING
OF WIR~ ROPES
This invention relates to a method and apparatus for single pass impregnation and jacketing of wire ropes.
It is well known to impregnate wire ropes with plastic material in order to decrease wear and ~Eatigue of the rope and increase its life. Canadian Patent No. 1,208,863 issued to the same interest as the present app:Lication discloses such a plastic filled wire rope. It is often desir~ble in some applications where a plastic filled wire rope does not pass over shackles, pulleys or the like, such as in mine shaft balanced ropes, to provide a jacket of plastic material over the rope to prevent corrosion. This is normally done by subsequently extruding a jacket of plastic material over the plastic filled wlre rope. This operation has however never been very satisfactory because the subsequently applied jacket of plastic material does not adequately adhere to the plastic filled wire rop72 and eventually peels of f .
It is the object of the present invention to provide a jacket of plastic material which is integrally formed during impregnation of the plastic material and there~ore forms part of the plastic filled wire rope~
The method 7 in accordance with the present invention comprises the steps of injecting plastic material in molten state into the wire rope under sufflcient heat and pressure ;~ to fill the interstices between at least the outer strands o~
the rope, and directing the excess plastic material from the 7~b ~, , ~
surface of the filled wire rope at the exit of the extrusion process to form a jacket of plastic material integral with the plastic material of the filled wire rope.
The thickness of the jacket of plastic material is preferably between about 0.05 and 0.2 inch (1.25 and 5 mm) depending on the diameter of the wire rope and its desired ~ properties.
; The apparatus for single pass imp:re~nation and jacket-ing of the wire rope comprises an extruder for injecting plastic material in molten state into the wire rope under sufficient heat and pressure to fill the interstices between at least the outer strands of the wire rope, and a die lo-cated at the exit end of the extruder for removing the excess ; plastic material from the surface of the wire rope and subse-quently redirecting it onto the surface o~ the wire rope to : provide a jacket of plastic material integral with the plas-~ tic material o~ the filled wire rope.
`~ The jacketing die preferably comprises a scraper having an inner diameter slightly larger than the diameter of the wire rope ~or removing the excess plastic material and means . for subsequsntly redirecting the excess plastic material onto the surface of the wire rope to form the jacket of plastic . materlal.
The invention will now be disclosed, by way of example, with reference to the accompanying drawings in which:
'~:
:
Figure 1 is a longitudinal, generally cross-sectional view of the extruder arrangement for carrying out the preferred embodiment in accordance with the present inven~
tion;
Figure 2 is an enlarged cross-sec1ional view along line
METHOD AND APPARATUS FOR PLASTIC IMPREGNATION AND JACKETING
OF WIR~ ROPES
This invention relates to a method and apparatus for single pass impregnation and jacketing of wire ropes.
It is well known to impregnate wire ropes with plastic material in order to decrease wear and ~Eatigue of the rope and increase its life. Canadian Patent No. 1,208,863 issued to the same interest as the present app:Lication discloses such a plastic filled wire rope. It is often desir~ble in some applications where a plastic filled wire rope does not pass over shackles, pulleys or the like, such as in mine shaft balanced ropes, to provide a jacket of plastic material over the rope to prevent corrosion. This is normally done by subsequently extruding a jacket of plastic material over the plastic filled wlre rope. This operation has however never been very satisfactory because the subsequently applied jacket of plastic material does not adequately adhere to the plastic filled wire rop72 and eventually peels of f .
It is the object of the present invention to provide a jacket of plastic material which is integrally formed during impregnation of the plastic material and there~ore forms part of the plastic filled wire rope~
The method 7 in accordance with the present invention comprises the steps of injecting plastic material in molten state into the wire rope under sufflcient heat and pressure ;~ to fill the interstices between at least the outer strands o~
the rope, and directing the excess plastic material from the 7~b ~, , ~
surface of the filled wire rope at the exit of the extrusion process to form a jacket of plastic material integral with the plastic material of the filled wire rope.
The thickness of the jacket of plastic material is preferably between about 0.05 and 0.2 inch (1.25 and 5 mm) depending on the diameter of the wire rope and its desired ~ properties.
; The apparatus for single pass imp:re~nation and jacket-ing of the wire rope comprises an extruder for injecting plastic material in molten state into the wire rope under sufficient heat and pressure to fill the interstices between at least the outer strands of the wire rope, and a die lo-cated at the exit end of the extruder for removing the excess ; plastic material from the surface of the wire rope and subse-quently redirecting it onto the surface o~ the wire rope to : provide a jacket of plastic material integral with the plas-~ tic material o~ the filled wire rope.
`~ The jacketing die preferably comprises a scraper having an inner diameter slightly larger than the diameter of the wire rope ~or removing the excess plastic material and means . for subsequsntly redirecting the excess plastic material onto the surface of the wire rope to form the jacket of plastic . materlal.
The invention will now be disclosed, by way of example, with reference to the accompanying drawings in which:
'~:
:
Figure 1 is a longitudinal, generally cross-sectional view of the extruder arrangement for carrying out the preferred embodiment in accordance with the present inven~
tion;
Figure 2 is an enlarged cross-sec1ional view along line
2-2 of the jacketing die shown in Figure 1; and : Figure 3 is a cross-sectional view of a plastic filled wire rope made with the method in accordance with the inven-tion.
Referring to Figures 1 and 2, preheated wire rope 10 is passed through an extrusion cross-head ll. The preheating operation has not been illustrated because it can be carried out by any desired means, such as an induction heater, a flame heater or the lik ;: 15 Molten plastic is typically supplied by an extruder through passages 12, 13 and 14, as shown by the arrows. The plastic is supplied under pressure which is generated by an extrusion screw (not shown). The pressurized plastic penetrates the rope lO between extrusion dies 16 and 17 and the rearward flow of plastic through the rope pushes out any excess lubricant 15 at the rear of die 16 and out of the cross-head 11. Bulging of the excess plastic matsrial be-tween the strands normally occurs as the filled rope exits die 17. A jacketing die 18 is mounted on the exit end of die - 25 17 for removlng such excess plastic material and redirecting it onto the plastic filled wire~rope to form a jacket in-te~ral with the plastic material of the plastic filled wire ~5~37 rope. The jacketing die comprises a scraper 19 having an in-ner diameter slightly larger than the diameter of the wire rope to remove the excess plastic mater:ial from the surface of the wire rope. The scraper is mounted in an insid2 cavity 20 formed in the jacketing die and is centrally spaced in the cavity by means of sp~cers 21 which define a passage between the cavity and the scraper to allow forward flow of plastic material onto the plastic filled wire rope. The scraper is provided with adjustment screws 22 to Pnsure that the jacket of plastic material is of even thickness around the wire rope. It i5 to be understood that other means for removing excess material from the surface of the wire rope and redirecting so as to form a jacket integral with the plastic filled wire rope are also envisaged within the scope of this invention.
Figure 3 shows a cross-section of a typical filled wire rope having 8 outer strands over 8 inner strands over a 6 strand IWRC (Independent Wire ~ope Core). This wire rope 23 ,, is essentially fully filled with pla~stic material 24 in the interstices between the individual outer and inner strands and ~urther comprises a jacket ha~ing a thickness between about 0.05 and 0.20 inch integrally formed with the plastic filled wire rope. With proper adjustment of the scraper 19, the jacket is made concentric with the wire rope which means that an uniform layer of plastic material is formed on the wire rope for adequate protection of the wire rop~ against ~;~ corrosion. ' : ' ' , , , ~ , ~ : . ' ~' 1. . ' - ' :
~: ' '~ : .
Although the invention has been disclosed with reference to a plastic filled lubricated wirs rope o~ the type disclosed in Canadian Patent No. 1,208,863 referred to above, it is to be understood that it may also apply to any plastic filled wire rope whether it is lubricated, galvanized or even dry. It is also to be understood that the expression "wire rope" may mean either t,he final wire rope product or a wire rope core around which further strands may be wound to produce the final product. It is quite common in the industry to use a wire rope as a core in order to make a larger wire rope product. In this case the jacket around the wire rope core will act as a cushion for the surrounding ~trands and thereby will extend the life of the fi~al ~1re rope product.
, ~ ~!
' . '
Referring to Figures 1 and 2, preheated wire rope 10 is passed through an extrusion cross-head ll. The preheating operation has not been illustrated because it can be carried out by any desired means, such as an induction heater, a flame heater or the lik ;: 15 Molten plastic is typically supplied by an extruder through passages 12, 13 and 14, as shown by the arrows. The plastic is supplied under pressure which is generated by an extrusion screw (not shown). The pressurized plastic penetrates the rope lO between extrusion dies 16 and 17 and the rearward flow of plastic through the rope pushes out any excess lubricant 15 at the rear of die 16 and out of the cross-head 11. Bulging of the excess plastic matsrial be-tween the strands normally occurs as the filled rope exits die 17. A jacketing die 18 is mounted on the exit end of die - 25 17 for removlng such excess plastic material and redirecting it onto the plastic filled wire~rope to form a jacket in-te~ral with the plastic material of the plastic filled wire ~5~37 rope. The jacketing die comprises a scraper 19 having an in-ner diameter slightly larger than the diameter of the wire rope to remove the excess plastic mater:ial from the surface of the wire rope. The scraper is mounted in an insid2 cavity 20 formed in the jacketing die and is centrally spaced in the cavity by means of sp~cers 21 which define a passage between the cavity and the scraper to allow forward flow of plastic material onto the plastic filled wire rope. The scraper is provided with adjustment screws 22 to Pnsure that the jacket of plastic material is of even thickness around the wire rope. It i5 to be understood that other means for removing excess material from the surface of the wire rope and redirecting so as to form a jacket integral with the plastic filled wire rope are also envisaged within the scope of this invention.
Figure 3 shows a cross-section of a typical filled wire rope having 8 outer strands over 8 inner strands over a 6 strand IWRC (Independent Wire ~ope Core). This wire rope 23 ,, is essentially fully filled with pla~stic material 24 in the interstices between the individual outer and inner strands and ~urther comprises a jacket ha~ing a thickness between about 0.05 and 0.20 inch integrally formed with the plastic filled wire rope. With proper adjustment of the scraper 19, the jacket is made concentric with the wire rope which means that an uniform layer of plastic material is formed on the wire rope for adequate protection of the wire rop~ against ~;~ corrosion. ' : ' ' , , , ~ , ~ : . ' ~' 1. . ' - ' :
~: ' '~ : .
Although the invention has been disclosed with reference to a plastic filled lubricated wirs rope o~ the type disclosed in Canadian Patent No. 1,208,863 referred to above, it is to be understood that it may also apply to any plastic filled wire rope whether it is lubricated, galvanized or even dry. It is also to be understood that the expression "wire rope" may mean either t,he final wire rope product or a wire rope core around which further strands may be wound to produce the final product. It is quite common in the industry to use a wire rope as a core in order to make a larger wire rope product. In this case the jacket around the wire rope core will act as a cushion for the surrounding ~trands and thereby will extend the life of the fi~al ~1re rope product.
, ~ ~!
' . '
Claims (5)
1. A method for single pass impregnation and jacketing of a wire rope made of several outer strands wound over inner strands comprising the steps of:
a) injecting plastic material in molten state into the wire rope under sufficient heat and pressure to fill the interstices between at least the outer stands of the rope; and b) removing the excess plastic material from the surface of the wire rope and subsequently redirecting said excess plastic material onto the surface of the wire rope so as to provide a jacket of plastic material integrally formed with the wire rope and concentric thereto.
a) injecting plastic material in molten state into the wire rope under sufficient heat and pressure to fill the interstices between at least the outer stands of the rope; and b) removing the excess plastic material from the surface of the wire rope and subsequently redirecting said excess plastic material onto the surface of the wire rope so as to provide a jacket of plastic material integrally formed with the wire rope and concentric thereto.
2. A method as defined in claim 1 wherein the thickness of the jacket of plastic material is between about 0.05 and 0.2 inch (1.25 and 5 mm).
3. A method as defined in claim 1, wherein the wire rope is a lubricated, galvanized or essentially dry wire rope.
4. An apparatus for single pass impregnation and jacketing of a wire rope made of several outer strands wound over inner strands comprising:
a) an extruder for injecting plastic material in molten state into the wire rope under sufficient heat and pressure to fill the interstices between at least the outer strands of the wire rope; and b) a die located at the exit end of the extruder for removing the excess plastic material from the surface of the wire rope and subsequently redirecting said excess plastic material onto the surface of the wire rope so as to provide a jacket of plastic material which is integral with the plastic material of the wire rope and concentric thereto.
a) an extruder for injecting plastic material in molten state into the wire rope under sufficient heat and pressure to fill the interstices between at least the outer strands of the wire rope; and b) a die located at the exit end of the extruder for removing the excess plastic material from the surface of the wire rope and subsequently redirecting said excess plastic material onto the surface of the wire rope so as to provide a jacket of plastic material which is integral with the plastic material of the wire rope and concentric thereto.
5. An apparatus as defined in claim 4, wherein the jacketing die comprises an inside cavity, a scraper having an inside diameter slightly larger than the outer diameter of the wire rope mounted in said cavity for removing the excess plastic material from the surface of the wire rope, means for defining a passage between the scraper and the wall of the cavity do direct the excess plastic material onto the surface of the wire rope to form an integral jacket of plastic material on the wire rope, and adjustment means mounted on the jacketing die and engaging the scraper to ensure that the jacket of plastic material is concentric with the wire rope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000580375A CA1305597C (en) | 1988-10-17 | 1988-10-17 | Method and apparatus for plastic impregnation and jacketing of wire ropes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000580375A CA1305597C (en) | 1988-10-17 | 1988-10-17 | Method and apparatus for plastic impregnation and jacketing of wire ropes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1305597C true CA1305597C (en) | 1992-07-28 |
Family
ID=4138928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000580375A Expired - Lifetime CA1305597C (en) | 1988-10-17 | 1988-10-17 | Method and apparatus for plastic impregnation and jacketing of wire ropes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1305597C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047193A (en) * | 2003-12-05 | 2014-09-17 | 布鲁格电缆股份公司 | Flexible traction organ |
| US10160623B2 (en) | 2015-05-07 | 2018-12-25 | Ehc Canada, Inc. | Compact composite handrails with enhanced mechanical properties |
| US10350807B2 (en) | 2007-09-10 | 2019-07-16 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
| US10940625B2 (en) | 2007-09-10 | 2021-03-09 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
| CN115179524A (en) * | 2022-07-06 | 2022-10-14 | 鞍钢实业集团冶金机械有限公司 | Steel rope surface injection molding production method |
-
1988
- 1988-10-17 CA CA000580375A patent/CA1305597C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047193A (en) * | 2003-12-05 | 2014-09-17 | 布鲁格电缆股份公司 | Flexible traction organ |
| US10350807B2 (en) | 2007-09-10 | 2019-07-16 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
| US10940625B2 (en) | 2007-09-10 | 2021-03-09 | Ehc Canada, Inc. | Method and apparatus for extrusion of thermoplastic handrail |
| US10160623B2 (en) | 2015-05-07 | 2018-12-25 | Ehc Canada, Inc. | Compact composite handrails with enhanced mechanical properties |
| US10287133B2 (en) | 2015-05-07 | 2019-05-14 | Ehc Canada, Inc. | Compact composite handrails with enhanced mechanical properties |
| CN115179524A (en) * | 2022-07-06 | 2022-10-14 | 鞍钢实业集团冶金机械有限公司 | Steel rope surface injection molding production method |
| CN115179524B (en) * | 2022-07-06 | 2024-06-11 | 鞍钢实业集团冶金机械有限公司 | Steel rope surface injection molding production method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |