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WO1992009420A1 - Process and apparatus for applying a plastics enclosure to surfaces that are to be protected - Google Patents

Process and apparatus for applying a plastics enclosure to surfaces that are to be protected Download PDF

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Publication number
WO1992009420A1
WO1992009420A1 PCT/GB1991/002095 GB9102095W WO9209420A1 WO 1992009420 A1 WO1992009420 A1 WO 1992009420A1 GB 9102095 W GB9102095 W GB 9102095W WO 9209420 A1 WO9209420 A1 WO 9209420A1
Authority
WO
WIPO (PCT)
Prior art keywords
article
enclosed
semi finished
polymeric
polymeric part
Prior art date
Application number
PCT/GB1991/002095
Other languages
French (fr)
Inventor
Horst Hoffmann
Original Assignee
Walter Rose Gmbh & Co Kg
Raychem Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Walter Rose Gmbh & Co Kg, Raychem Limited filed Critical Walter Rose Gmbh & Co Kg
Priority to KR1019930701583A priority Critical patent/KR930702143A/en
Publication of WO1992009420A1 publication Critical patent/WO1992009420A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/70Completely encapsulating inserts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/72Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/14Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
    • H02G1/145Moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B29C2043/181Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles encapsulated
    • B29C2043/182Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles encapsulated completely
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16Cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/07Flat, e.g. panels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/09Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels

Definitions

  • the invention relates to a process and an apparatus for applying a plastics enclosure to surfaces of articles that are to be protected, especially for applying plastics enclosures to a metal housing.
  • DE 3127869 describes a method of producing a connection and/or branch between coaxial cables using a kit comprising a metal housing containing an electronics plate, and a heat shrinkable polymeric sleeve enclosing the housing.
  • the housing is provided with cable entries to receive the cables to be connected and/or branched, and these cable entries are connected to the electronics plate.
  • the heat shrinkable sleeve is provided in two halves having corresponding cable entry pipes, the two halves are pre-shrunk over the housing at the factory, and the resulting branch set can then be delivered to the building site.
  • a first aspect of the invention provides a process for applying a polymeric enclosure to surfaces of articles that are to be protected, comprising
  • a second aspect of the invention provides an apparatus suitable for carrying out the process according to the first aspect of the invention, comprising
  • a semi finished polymeric part extruder (a) a semi finished polymeric part extruder, a holder for the article or articles to be enclosed and a tool holder containing moulding presses for pressing against the semi finished polymeric part which moulding presses can be moved from an opening state in which the semi finished polymeric part can be inserted around the article to be enclosed and within the moulding presses, to a closed state in which the moulding process urge the semi finished part against the article to be enclosed .
  • the invention has a number of advantages over known procedures. Since the semi- finished polymeric part that surrounds the article to be enclosed is still in a deformable state, it is possible to enclose and protect not only regularly shaped articles, but also articles having comparatively complicated outer contours in a simple manner. Also the - 4 -
  • process can be carried out virtually continuously, which means, in particular, that it can be carried out very economically.
  • a process for the manufacture of an insulated connection between electrical conductors with a thermoplastic plastics foil in which inter alia a thermoplastic plastics tube is pushed over the connected conductors upstream of the connection, is known from DE-OS 16 46 408.
  • the connection site is coated with a plastics paste and the plastics screw tube is pushed over the corresponding site including the plastics insulation and the entire assembly is then welded to form a homogeneous body with the aid of a kind of waffle iron. It will be appreciated that this procedure is very complicated. Also, it does not employ semi-finished parts in their deformable state, nor is it suitable for continuous operation.
  • the semi-finished polymeric part is in the form of a double strip of polymeric material or in the form of a slit polymeric tube.
  • the wall thickness of the strip or tube may or may not vary in cross-section.
  • the article to be enclosed is, for example, a cable entry pipe into a housing, eg for connection or branching of coaxial cable leads via an electronics plate or similar within the housing, the tips of the cable entries can be provided with an accumulation of material in order to render possible a higher tensile strength or the like when the cable leads or the like have been inserted.
  • a moulding process is used to urge the semi finished part against the article.
  • the moulding involves the application of pressing tools against the semi finished polymeric part towards the article to be - o
  • the inner surface of the pressing tools may be arranged to correspond generally with that of the outer surface of the article to be enclosed.
  • compressed air may be applied to the semi ⁇ finished polymeric part to apply, or to enhance application of the part around the article to be enclosed.
  • the compressed air may be used in addition to cooling air applied to the semi-finished polymeric part.
  • air may be withdrawn from within the article to be enclosed, thereby applying a drawing pressure on the polymeric part, to apply or to enhance application of the part.
  • a combination of compressed air applied to the outer surface, and drawing pressure may also be used.
  • Blow moulding equipment may be used in the above embodiment of the present invention, which may be considered as an 'inside-out' blow moulding process.
  • the invention provides as well as a method, an apparatus as set out above in accordance with the second aspect of the invention.
  • the tool holder is advantageously constructed to be displaceable together with the article holder so that the article can be brought into the extrusion path of the semi-finished polymeric part.
  • the holder for the article to be enclosed is equipped with a suction channel.
  • This channel can be used for at least partially evacuating air from the region of the article to be enclosed.
  • This apparatus makes it possible to produce, at least temporarily, a slight vacuum in the interior of the article to be enclosed, which assists the application of the outer plastics enclosure.
  • the pressing tools can be equipped at their surfaces, facing - 4 -
  • a process for the manufacture of an insulated connection between electrical conductors with a thermoplastic plastics foil in which inter alia a thermoplastic plastics tube is pushed over the connected conductors upstream of the connection, is known from DE-OS 16 46 408.
  • the connection site is coated with a plastics paste and the plastics screw tube is pushed over the corresponding site including the plastics insulation and the entire assembly is then welded to form a homogeneous body with the aid of a kind of waffle iron. It will be appreciated that this procedure is very complicated. Also, it does not employ semi-finished parts in their deformable state, nor is it suitable for continuous operation.
  • the semi-finished polymeric part is in the form of a double strip of polymeric material or in the form of a slit polymeric tube.
  • the wall thickness of the strip or tube may or may not vary in cross-section.
  • the article to be enclosed is, for example, a cable entry pipe into a housing, eg for connection or branching of coaxial cable leads via an electronics plate or similar within the housing, the tips of the cable entries can be provided with an accumulation of material in order to render possible a higher tensile strength or the like when the cable leads or the like have been inserted.
  • a moulding process is used to urge the semi finished part against the article.
  • the moulding involves the application of pressing tools against the semi finished polymeric part towards the article to be - 7 -
  • the tool holder 1 is then moved back to the left in the direction of the arrow 10 ( Figure 1C), the moulding tools 2a, 2b are subsequently opened according to the double arrow 11, and the holding rod 4 is withdrawn to the left according to arrow 12, so that the finished enclosed article 5, which is then designated 5' in Figure ID, can be removed or ejected.
  • the sequence of steps according to Figures 1A to ID can then be repeated on other parts.
  • the article holder 3 may be constructed in a different manner.
  • it may be designed as a revolving holder, i.e. by rotating, it can in one operating process remove one article already enclosed and introduce the next article 5 that is to be enclosed.
  • the described embodiment can, of course, be further modified in various respects.
  • the semi-finished polymeric part 7 may be in the form of a closed tube or a tube that is open at one side and so on.
  • the insides of the moulding tools 2 can be loaded with compressed air.
  • air can be sucked out of the interior of the article being enclosed via he holder 4.
  • Other methods of assisting moulding can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A process and an apparatus for applying a polymeric enclosure to surfaces of articles (5) to provide protection against environmental influences, corrosion or mechanical stressing of the surfaces, is described. The process is essentially a continuous process, involving extruding a semi-finished polymeric part (7) in the form of a strip or tube which is slit or split or in the form of two strips, while it is in its deformable state, positioning the article (5) to be enclosed in the extrusion path of the semi-finished part and then using moulding presses (2a, 2b) to urge the semi-finished part around the article.

Description

DESCRIPTION
Process and apparatus for applying a plastics enclosure to surfaces that are to be protected
The invention relates to a process and an apparatus for applying a plastics enclosure to surfaces of articles that are to be protected, especially for applying plastics enclosures to a metal housing.
For a long time, efforts have been made to protect against corrosion those surfaces of articles that are exposed to moisture, especially their outer surfaces. For example in the field of broad band communications cables metal housings are typically provided at junctions of such cables. It is known to protect these metal housings in shrinkable plastics enclosures, as described, for example, in DE-30 40 864 Al, DE-31 27 869-A1 and DE-31 24 374-A1. .
As an example, DE 3127869 describes a method of producing a connection and/or branch between coaxial cables using a kit comprising a metal housing containing an electronics plate, and a heat shrinkable polymeric sleeve enclosing the housing. The housing is provided with cable entries to receive the cables to be connected and/or branched, and these cable entries are connected to the electronics plate. The heat shrinkable sleeve is provided in two halves having corresponding cable entry pipes, the two halves are pre-shrunk over the housing at the factory, and the resulting branch set can then be delivered to the building site.
It is also known to spray a liquid plastics material onto the outer surface of the housings as a corrosion protection. The coating procedure may take place in several stages, for example a curable synthetic resin may be sprayed first, and then a filler sprayed on subsequently, as disclosed in DE-AS 21 09 393. Similarly, plastics tubes that are closed by spraying on polyethylene are disclosed in DE-AS 18 01 933, and application of - -
Thus, a first aspect of the invention provides a process for applying a polymeric enclosure to surfaces of articles that are to be protected, comprising
(i) extruding a polymeric part in the form of a strip or tube, which is slit or split, or is in the form of two strips,
(ii) positioning the article to be enclosed in the extrusion path of the semi finished part, through the slit or split or between the two strips while the part is still in a deformable state, and
(iii) applying moulding presses against the semi finished part to urge it against the surfaces of the article to be enclosed.
A second aspect of the invention provides an apparatus suitable for carrying out the process according to the first aspect of the invention, comprising
(a) a semi finished polymeric part extruder, a holder for the article or articles to be enclosed and a tool holder containing moulding presses for pressing against the semi finished polymeric part which moulding presses can be moved from an opening state in which the semi finished polymeric part can be inserted around the article to be enclosed and within the moulding presses, to a closed state in which the moulding process urge the semi finished part against the article to be enclosed .
The invention has a number of advantages over known procedures. Since the semi- finished polymeric part that surrounds the article to be enclosed is still in a deformable state, it is possible to enclose and protect not only regularly shaped articles, but also articles having comparatively complicated outer contours in a simple manner. Also the - 4 -
process can be carried out virtually continuously, which means, in particular, that it can be carried out very economically.
A process for the manufacture of an insulated connection between electrical conductors with a thermoplastic plastics foil, in which inter alia a thermoplastic plastics tube is pushed over the connected conductors upstream of the connection, is known from DE-OS 16 46 408. The connection site is coated with a plastics paste and the plastics screw tube is pushed over the corresponding site including the plastics insulation and the entire assembly is then welded to form a homogeneous body with the aid of a kind of waffle iron. It will be appreciated that this procedure is very complicated. Also, it does not employ semi-finished parts in their deformable state, nor is it suitable for continuous operation.
Further embodiments of the process and apparatus according to the invention is apparent from the sub claims. In preferred embodiments the semi-finished polymeric part is in the form of a double strip of polymeric material or in the form of a slit polymeric tube. The wall thickness of the strip or tube may or may not vary in cross-section.
Especially by providing an extruded polymeric part that varies in wall thickness across its surface, it is possible to provide an accumulation of material in some regions should that be necessary, for example, for reasons of the use to which the finished article enclosed by the polymeric part is to be put. If the article to be enclosed is, for example, a cable entry pipe into a housing, eg for connection or branching of coaxial cable leads via an electronics plate or similar within the housing, the tips of the cable entries can be provided with an accumulation of material in order to render possible a higher tensile strength or the like when the cable leads or the like have been inserted.
A moulding process is used to urge the semi finished part against the article. Preferably the moulding involves the application of pressing tools against the semi finished polymeric part towards the article to be - o
enclosed. The inner surface of the pressing tools may be arranged to correspond generally with that of the outer surface of the article to be enclosed.
In one embodiment, compressed air may be applied to the semi¬ finished polymeric part to apply, or to enhance application of the part around the article to be enclosed. The compressed air may be used in addition to cooling air applied to the semi-finished polymeric part. In another embodiment air may be withdrawn from within the article to be enclosed, thereby applying a drawing pressure on the polymeric part, to apply or to enhance application of the part. A combination of compressed air applied to the outer surface, and drawing pressure may also be used.
Blow moulding equipment may be used in the above embodiment of the present invention, which may be considered as an 'inside-out' blow moulding process.
The invention provides as well as a method, an apparatus as set out above in accordance with the second aspect of the invention.
Preferred constructions of the apparatus are apparent from the sub claims.
The tool holder is advantageously constructed to be displaceable together with the article holder so that the article can be brought into the extrusion path of the semi-finished polymeric part.
In a preferred embodiment of the apparatus, the holder for the article to be enclosed is equipped with a suction channel. This channel can be used for at least partially evacuating air from the region of the article to be enclosed. This apparatus makes it possible to produce, at least temporarily, a slight vacuum in the interior of the article to be enclosed, which assists the application of the outer plastics enclosure. Instead, or in addition, the pressing tools can be equipped at their surfaces, facing - 4 -
process can be carried out virtually continuously, which means, in particular, that it can be carried out very economically.
A process for the manufacture of an insulated connection between electrical conductors with a thermoplastic plastics foil, in which inter alia a thermoplastic plastics tube is pushed over the connected conductors upstream of the connection, is known from DE-OS 16 46 408. The connection site is coated with a plastics paste and the plastics screw tube is pushed over the corresponding site including the plastics insulation and the entire assembly is then welded to form a homogeneous body with the aid of a kind of waffle iron. It will be appreciated that this procedure is very complicated. Also, it does not employ semi-finished parts in their deformable state, nor is it suitable for continuous operation.
Further embodiments of the process and apparatus according to the invention is apparent from the sub claims. In preferred embodiments the semi-finished polymeric part is in the form of a double strip of polymeric material or in the form of a slit polymeric tube. The wall thickness of the strip or tube may or may not vary in cross-section.
Especially by providing an extruded polymeric part that varies in wall thickness across its surface, it is possible to provide an accumulation of material in some regions should that be necessary, for example, for reasons of the use to which the finished article enclosed by the polymeric part is to be put. If the article to be enclosed is, for example, a cable entry pipe into a housing, eg for connection or branching of coaxial cable leads via an electronics plate or similar within the housing, the tips of the cable entries can be provided with an accumulation of material in order to render possible a higher tensile strength or the like when the cable leads or the like have been inserted.
A moulding process is used to urge the semi finished part against the article. Preferably the moulding involves the application of pressing tools against the semi finished polymeric part towards the article to be - 7 -
tools 2a and 2b are then advanced towards each other according to the double arrow 9 in Figure IB, until the position shown in Figure 1C is reached, in which position shown in Figure 1C cutting operations or the like can be simultaneously performed.
The tool holder 1 is then moved back to the left in the direction of the arrow 10 (Figure 1C), the moulding tools 2a, 2b are subsequently opened according to the double arrow 11, and the holding rod 4 is withdrawn to the left according to arrow 12, so that the finished enclosed article 5, which is then designated 5' in Figure ID, can be removed or ejected. The sequence of steps according to Figures 1A to ID can then be repeated on other parts.
The article holder 3, may be constructed in a different manner. For example it may be designed as a revolving holder, i.e. by rotating, it can in one operating process remove one article already enclosed and introduce the next article 5 that is to be enclosed.
The described embodiment can, of course, be further modified in various respects. For example, the semi-finished polymeric part 7 may be in the form of a closed tube or a tube that is open at one side and so on. In order to assist moulding, the insides of the moulding tools 2 can be loaded with compressed air. As another option, or in addition air can be sucked out of the interior of the article being enclosed via he holder 4. Other methods of assisting moulding can also be used.

Claims

8CLAIMS
1. A process for applying a polymeric enclosure (7a) to surfaces of articles (5) that are to be protected, comprising
(i) extruding a polymeric part (7) in the form of a strip or tube, which is slit or split, or is in the form of two strips,
(ii) positioning the article (5) to be enclosed in the extrusion path of the semi finished part (7), through the slit or split or between the two strips, while the part is still in a deformable state, and
(iii) applying moulding presses (2a, 2b) against the semi finished part (7) to urge it against the surfaces of the article (5) to be enclosed.
2. A process according to claim 2, wherein the semi finished polymeric part (7) is in the form of a double strip of plastics material, or in the form of a slit polymeric tube and the article to be enclosed (5) is guided between the strips of plastics material or into the interior of the tube and, subsequently, the strips of plastics material or the regions of the plastics tube are pressed together by means of pressing tools (2a, 2b), thereby enclosing the article (5) to be protected.
*
3. A process according to claim 1 or 2, wherein semi finished polymeric part(s) (7) having regions of differing wall thickness across their surface are used to enclose the articles (5).
4. A process according to claim 1, 2 or 3, wherein in addition to applying moulding presses (2a, 2b) to the semi finished polymeric part, compressed air is applied to the semi finished polymeric part to urge it against the surfaces of the articles (5) to be enclosed.
5. A process according to claim 4. wherein the compressed air is used in addition as cooling air for cooling the semi finished polymeric part(7).
6. An apparatus suitable for carrying out the process according to any of the preceding claims, comprising
(a) a semi finished polymeric part extruder (8), a holder (3) for the article or articles to be enclosed and a tool holder (1) containing moulding presses (2a, 2b) for pressing against the semi finished polymeric part (7), which moulding presses can be moved from an open state in which the semi finished polymeric part (7) can be inserted around the article to be enclosed (5) and within the moulding presses (2a, 2b), to a closed state in which the moulding presses urge the semi finished part (7) against the article to be enclosed (5).
7. A apparatus according to claim 6, wherein the tool holder (1) together with the article holder (3) is equipped with a device (4) for positioning the article to be enclosed (5) together with the moulding presses (2a, 2b) in their open state into the extrusion path of the semi finished polymeric part (7).
8. An apparatus according to claim 6 or 7, wherein the holder (3) for the article (5) to be enclosed is equipped with a suction channel for at least partially evacuating air from the region of the article (5) to be enclosed.
9. An apparatus according to any of claims 6 to 8, wherein the moulding presses (2a, 2b) are equipped on their inner surfaces with outlet nozzles for supplying moulding and cooling air, which outlets are directed towards the article (5) to be enclosed.
10. An apparatus according to any of claims 6 to 9, wherein a plurality of article holders are provided in a linear or 1 0 revolving arrangement on a holder (3).
11. An article provided with a polymeric enclosure (7) formed by a semi finished polymeric part which has been extruded in the form of a strip or tube which is slit or split or is in the form of two strips and which has been pressed in its deformable state around the outer surfaces of the article inserted through the slit or split or between the two strips by means of moulding presses (2a and 2b).
PCT/GB1991/002095 1990-11-27 1991-11-27 Process and apparatus for applying a plastics enclosure to surfaces that are to be protected WO1992009420A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930701583A KR930702143A (en) 1990-11-27 1991-11-27 Method and device for enclosing the surface to be protected with a plastic enclosure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4037675A DE4037675A1 (en) 1990-11-27 1990-11-27 METHOD AND DEVICE FOR APPLYING A PLASTIC COATING TO SURFACES TO BE PROTECTED
DEP4037675.3 1990-11-27

Publications (1)

Publication Number Publication Date
WO1992009420A1 true WO1992009420A1 (en) 1992-06-11

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Application Number Title Priority Date Filing Date
PCT/GB1991/002095 WO1992009420A1 (en) 1990-11-27 1991-11-27 Process and apparatus for applying a plastics enclosure to surfaces that are to be protected

Country Status (4)

Country Link
EP (1) EP0563061A1 (en)
KR (1) KR930702143A (en)
DE (2) DE9017905U1 (en)
WO (1) WO1992009420A1 (en)

Cited By (1)

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WO2005099997A1 (en) * 2004-04-16 2005-10-27 France (Qld) Pty Ltd Vacuum form encapsulated articles

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Publication number Priority date Publication date Assignee Title
WO2002098637A1 (en) * 2001-06-01 2002-12-12 Meridian Automotive Systems, Inc. Thermoplastic sandwich panel and twin sheet moulding method of making same
CN110299680B (en) * 2019-03-19 2020-10-23 国网上海市电力公司 Power transmission and transformation circuit installation and maintenance device

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DE9017905U1 (en) 1992-11-05
EP0563061A1 (en) 1993-10-06
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DE4037675C2 (en) 1993-01-21
DE4037675A1 (en) 1992-06-11

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