GB2155359A - Method of producing fabric covering for conveyor belt - Google Patents

Method of producing fabric covering for conveyor belt Download PDF

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Publication number
GB2155359A
GB2155359A GB08501434A GB8501434A GB2155359A GB 2155359 A GB2155359 A GB 2155359A GB 08501434 A GB08501434 A GB 08501434A GB 8501434 A GB8501434 A GB 8501434A GB 2155359 A GB2155359 A GB 2155359A
Authority
GB
United Kingdom
Prior art keywords
coating
conveyor belt
fabric
producing
application
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.)
Granted
Application number
GB08501434A
Other versions
GB8501434D0 (en
GB2155359B (en
Inventor
Gunter Ronsch
Bernd Opitz
Wolfgang Muller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nagema VEB
Original Assignee
Nagema VEB
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 Nagema VEB filed Critical Nagema VEB
Publication of GB8501434D0 publication Critical patent/GB8501434D0/en
Publication of GB2155359A publication Critical patent/GB2155359A/en
Application granted granted Critical
Publication of GB2155359B publication Critical patent/GB2155359B/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
    • D06N3/145—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes two or more layers of polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B29D29/06—Conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Belt Conveyors (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

In a method of producing a fabric coating for conveyor belts such as are used particularly for light goods and foodstuffs industries a two component polyurethane is applied to the basic fabric in more than ten coatings by per se known direct coating methods, the application of the first stroke being 40 g/sq.m while the application of further strokes is reduced regularly and stepwise over the further strokes down to 10 g/sq.m, drying and cooling being carried out after each coating and final preparation for use being carried out by a heated roller cutter after the coating process has been completed.

Description

SPECIFICATION Method of producing a fabric covering for conveyor belt The object of the invention is a method of producing a fabric covering for conveyor belts such as are used in particular in the light goods and foodstuffs industries.
A conveyor belt is known in which the basic fabric is coated with a single-component polyurethane. The basic fabric consists of a polyester silk with wires woven in as warp threads. The warp threads lie in the transport direction.
While in the thermoplastics state, the polyurethane is applied to the basic fabric by the known reversal method. This stage in the process must, however, be preceded by the application of an adhesive in order to ensure reliable adhesion of the polyurethane coating to the basic fabric. The mass of the covering amounts to substantially 400 gl sq.m. In conclusion, the surface of the conveyor belt is given a secondary treatment in order to achieve a coating which is suited to the particular intended application. In most cases, the aim will be to achieve a closed smooth and abrasion-resistant surface. The disadvantage of this solution lies in the fact that the conveyor belts manufactured by this method wear out after a relatively short time, after approx. 2000 hours of operation.Transverse cracks form on the surface which become enlarged in course of time and reach the basic fabric. And so for instance aggressive media clinging to the materials being conveyed may penetrate through to the basic fabric and impregnate it. And so the conveyor belt becomes unusable.
The cause of these disadvantages resides in the fact that the conveyor belt passes over guide and feed rollers which are of small diameter. Functional necessity may means that the diameter in some cases is as little as 5 mm. In conjunction with a loop angle of 90 to 180 degrees, the conveyor belt is subjected to considerable loadings in these zones and must in particular perform considerable fulling work. Since, by virtue of the required mechanical loading capacity, particularly the resistance to abrasion, the coating must be of sufficient thickness, tension occurs between the upper face and under side of the coatings in the zones which are subject to stress. This leads to the aforementioned effect of transverse fissure formation.
The object of the invention is to develop a method of producing a fabric coating of conveyor belts which achieves a long effective life for the said conveyor belts.
The invention is based on the problem of developing a method of producing conveyor belts by which a coating is achieved which offers considerable flexibility for constantly high mechanical loading capacity.
According to the invention there is provided a method of producing a coated fabric suitable for conveyor belts comprising applying a two-component polyurethane by direct coating to the basic fabric in more than 10 coatings, the application of the first coating amounting to about (+10%) 40 gl sq.m and the application of the further coatings being steadily reduced in steps down to about (+10%) 10 g/sq.m in the final step, drying and cooling taking place after each coating and after the coating is completed. The product may be finally cut by means of a heated roller or rollers.
The invention has the advantage that the conveyor belt offers high flexibility and can thus withstand for a long time and without its functioning being adversely affected the loadings occassioned by the feed and guide rollers. The coating enjoys quite considerable adhesion to the basic fabric.
Despite the minimal thickness of its coverings, the conveyor belt is superior to currently used conveyor belts in terms of mechanical loading capacity, abrasion resistance and edge stability.
The invention will be described in greater detail hereinafter with regard to an embodiment. As an example, a conveyor belt was chosen such as is used for coating installations, as are used in the sweet and long-keeping cakes and biscuits industries. In such cases, the conveyor belt is used for conveying smail-bulk goods such as spiced cakes, waffles, marzipan and the like. It is subject to considerable loadings because it passes over feed and guide rollers which have a very small diameter.
This is necessary in order to guarantee trouble-free transfer from one conveyor belt to another.
For the conveyor belt according to the invention, a hardwearing basic fabric is used. Cord silk or similar fabrics are suitable. The fabric is washed, fixed and dyed. Afterwards, it is coated on one side with polyurethane. The known direct coating method is used, employing a rubber cloth scraper.
After the first coating, amount to 40 g/sq.m, the fabric is dried in an indirectly heated hot air duct at 90 to 130 degrees C. This is followed by cooling by means of cooling rollers. Afterwards, the second and the subsequent coatings are applied, the endeavour being regularly to reduce the amount applied per coating. After each application, drying and cooling take place as described above.
After the eleventh and thus last coating, which applies 10 g/sq.m, the conveyor belt is left to harden. The time required is 72 hours, hardeningout taking place with the belt stored in a hanging situation.
The final stage in the work is followed by preparation for use. This involves the conveyor belt being cut to its final width, heated roller cutters being used. The heated roller cutters fuse the edge of the conveyor belt due to the basic material used.
The coating comprises a total application of 260 g/sq.m, which means that it is currently less than the conveyor belts currently used.
1. Method of producing a coated fabric suitable for conveyor belts comprising applying a two-component polyurethane by direct coating to the basic fabric in more than 10 coatings, the application of the first coating amounting to about (t10%) 40 g/
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of producing a fabric covering for conveyor belt The object of the invention is a method of producing a fabric covering for conveyor belts such as are used in particular in the light goods and foodstuffs industries. A conveyor belt is known in which the basic fabric is coated with a single-component polyurethane. The basic fabric consists of a polyester silk with wires woven in as warp threads. The warp threads lie in the transport direction. While in the thermoplastics state, the polyurethane is applied to the basic fabric by the known reversal method. This stage in the process must, however, be preceded by the application of an adhesive in order to ensure reliable adhesion of the polyurethane coating to the basic fabric. The mass of the covering amounts to substantially 400 gl sq.m. In conclusion, the surface of the conveyor belt is given a secondary treatment in order to achieve a coating which is suited to the particular intended application. In most cases, the aim will be to achieve a closed smooth and abrasion-resistant surface. The disadvantage of this solution lies in the fact that the conveyor belts manufactured by this method wear out after a relatively short time, after approx. 2000 hours of operation.Transverse cracks form on the surface which become enlarged in course of time and reach the basic fabric. And so for instance aggressive media clinging to the materials being conveyed may penetrate through to the basic fabric and impregnate it. And so the conveyor belt becomes unusable. The cause of these disadvantages resides in the fact that the conveyor belt passes over guide and feed rollers which are of small diameter. Functional necessity may means that the diameter in some cases is as little as 5 mm. In conjunction with a loop angle of 90 to 180 degrees, the conveyor belt is subjected to considerable loadings in these zones and must in particular perform considerable fulling work. Since, by virtue of the required mechanical loading capacity, particularly the resistance to abrasion, the coating must be of sufficient thickness, tension occurs between the upper face and under side of the coatings in the zones which are subject to stress. This leads to the aforementioned effect of transverse fissure formation. The object of the invention is to develop a method of producing a fabric coating of conveyor belts which achieves a long effective life for the said conveyor belts. The invention is based on the problem of developing a method of producing conveyor belts by which a coating is achieved which offers considerable flexibility for constantly high mechanical loading capacity. According to the invention there is provided a method of producing a coated fabric suitable for conveyor belts comprising applying a two-component polyurethane by direct coating to the basic fabric in more than 10 coatings, the application of the first coating amounting to about (+10%) 40 gl sq.m and the application of the further coatings being steadily reduced in steps down to about (+10%) 10 g/sq.m in the final step, drying and cooling taking place after each coating and after the coating is completed. The product may be finally cut by means of a heated roller or rollers. The invention has the advantage that the conveyor belt offers high flexibility and can thus withstand for a long time and without its functioning being adversely affected the loadings occassioned by the feed and guide rollers. The coating enjoys quite considerable adhesion to the basic fabric. Despite the minimal thickness of its coverings, the conveyor belt is superior to currently used conveyor belts in terms of mechanical loading capacity, abrasion resistance and edge stability. The invention will be described in greater detail hereinafter with regard to an embodiment. As an example, a conveyor belt was chosen such as is used for coating installations, as are used in the sweet and long-keeping cakes and biscuits industries. In such cases, the conveyor belt is used for conveying smail-bulk goods such as spiced cakes, waffles, marzipan and the like. It is subject to considerable loadings because it passes over feed and guide rollers which have a very small diameter. This is necessary in order to guarantee trouble-free transfer from one conveyor belt to another. For the conveyor belt according to the invention, a hardwearing basic fabric is used. Cord silk or similar fabrics are suitable. The fabric is washed, fixed and dyed. Afterwards, it is coated on one side with polyurethane. The known direct coating method is used, employing a rubber cloth scraper. After the first coating, amount to 40 g/sq.m, the fabric is dried in an indirectly heated hot air duct at 90 to 130 degrees C. This is followed by cooling by means of cooling rollers. Afterwards, the second and the subsequent coatings are applied, the endeavour being regularly to reduce the amount applied per coating. After each application, drying and cooling take place as described above. After the eleventh and thus last coating, which applies 10 g/sq.m, the conveyor belt is left to harden. The time required is 72 hours, hardeningout taking place with the belt stored in a hanging situation. The final stage in the work is followed by preparation for use. This involves the conveyor belt being cut to its final width, heated roller cutters being used. The heated roller cutters fuse the edge of the conveyor belt due to the basic material used. The coating comprises a total application of 260 g/sq.m, which means that it is currently less than the conveyor belts currently used. CLAIMS
1. Method of producing a coated fabric suitable for conveyor belts comprising applying a two-component polyurethane by direct coating to the basic fabric in more than 10 coatings, the application of the first coating amounting to about (t10%) 40 g/ sq.m and the application of the further coatings being steadily reduced in steps down to about (+10%) 10 g/sq.m in the final step, drying and cooling taking place after each coating and after the coating is completed. The product may be finally cut by means of a heated roller or rollers.
2. A method of producing a coated fabric as claimed in Claim 1, wherein the fabric is prepared for use by cutting with a heated roller or rollers.
3. Method according to Claim 1, wherein 11 coatings are applied to the basic fabric.
4. Method according to Claim 1, wherein drying takes place after every coating in a heated air duct at 90 to 130 degrees C.
5. Method according to Claim 1, wherein cooling takes place by means of cooling rollers.
6. Method according to Claim 1, wherein reduction of the coating thickness occurs in a regular pattern.
7. A method as claimed in Claim 1, substantially as described herein.
GB08501434A 1984-03-08 1985-01-21 Method of producing a fabric covering for conveyor belt Expired GB2155359B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD84260697A DD231955A3 (en) 1984-03-08 1984-03-08 METHOD FOR PRODUCING A TISSUE COATING FOR TRANSPORT TRAVELERS

Publications (3)

Publication Number Publication Date
GB8501434D0 GB8501434D0 (en) 1985-02-20
GB2155359A true GB2155359A (en) 1985-09-25
GB2155359B GB2155359B (en) 1987-06-10

Family

ID=5555184

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08501434A Expired GB2155359B (en) 1984-03-08 1985-01-21 Method of producing a fabric covering for conveyor belt

Country Status (5)

Country Link
CH (1) CH665438A5 (en)
DD (1) DD231955A3 (en)
DE (1) DE3444152A1 (en)
DK (1) DK605884A (en)
GB (1) GB2155359B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0521245A1 (en) * 1991-06-29 1993-01-07 FORBO International S.A. Conveyor belt and method of its manufacture
FR2758437A1 (en) * 1997-01-23 1998-07-24 Althoffer Et Cie J Polypropylene@ band for rolling pastry in a bakery

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3339589A1 (en) * 1983-11-02 1985-05-09 Phoenix Ag, 2100 Hamburg Process for producing conveyor belts with close width tolerance

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2455318A1 (en) * 1974-11-22 1976-08-12 Bayer Ag Laminating sheets esp fabric, with several coatings - which are applied wet using temporary transfer strip and then all dried

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0521245A1 (en) * 1991-06-29 1993-01-07 FORBO International S.A. Conveyor belt and method of its manufacture
US5316132A (en) * 1991-06-29 1994-05-31 Fa. Ernst Siegling Conveyor belt and method for its manufacture
FR2758437A1 (en) * 1997-01-23 1998-07-24 Althoffer Et Cie J Polypropylene@ band for rolling pastry in a bakery

Also Published As

Publication number Publication date
CH665438A5 (en) 1988-05-13
GB8501434D0 (en) 1985-02-20
DE3444152A1 (en) 1985-09-12
GB2155359B (en) 1987-06-10
DK605884A (en) 1985-09-09
DD231955A3 (en) 1986-01-15
DE3444152C2 (en) 1988-04-07
DK605884D0 (en) 1984-12-18

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PCNP Patent ceased through non-payment of renewal fee