Fabric-free belt

Stock material or miscellaneous articles – Composite – Of polyamide

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

4284747, 4272071, 427208, 4272082, 4272084, 4273935, B32B 2708, B05D 510

Patent

active

060999721

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a fabric-free belt having an oriented polyamide layer as a tension layer to a process for the production of such a fabric-free belt.


BACKGROUND OF THE INVENTION

Belts which have high tensile strength and have been used to date usually as, inter alia, drive belts or conveyor belts, contain a sheet as a tension layer, which is surrounded on both sides by a fabric provided with an adhesion promoter layer, each having a rubber friction layer arranged thereon. The fabric performs the function of mechanical stabilization of the tension layer and is an important connecting element for the rubber friction layer and the tension layer. In some cases, such belts transmit or absorb large forces, and the bonds between the individual layers therefore have to meet high requirements. A disadvantage of these belts is that fabric layers are required, which have an adverse effect on the procedure for making such belts continuous and on the intrinsic energy consumption and the production costs of the belt.
DE-A-40 39 584 describes a fabric-free drive belt or conveyor belt comprising an oriented polyamide sheet as a tension layer, which is provided on at least one side with an adhesion promoter coating, on which a rubber sheet is arranged as a rubber friction layer in the form of a laminate. The adhesion promoter coating consists, for example, of a water/alcohol-based solution containing at least 15% by weight, preferably 50% by weight, of resorcinol, and is intended to ensure that the adhesive strength requirements are met.
This fabric-free belt has the disadvantage that an adhesion promoter coating first has to be applied to the polyamide sheet and drying then carried out in order to produce the bond between the oriented polyamide sheet and the rubber sheet. Only thereafter is the bond formed under pressure and at a temperature between 140.degree. C. and 190.degree. C. Owing to the complex process engineering, however, it is difficult to achieve uniform adhesion. Consequently, this solution has not become established in the market.
DE-A-21 14 746 describes a process for the production of a flexible laminated material usable in a conveyor belt, in which a layer of an elastomeric material, which contains resorcinol and a compound becoming a methylene donator when heated, is applied to a polyamide film and subsequently the structure is heated. The resorcinol as well as the methylene donator are necessary to cause an adherence between the elastomeric material and the polyamide. Moreover, this process is not, without further difficulty applicable to an oriented polyamide layer because of its surface polarity, thereby rendering a wetting more difficult.


OBJECTS OF THE INVENTION

In view of the disadvantages of the known, above described belts and belt production processes the invention is based on the following object. A fabric-free belt is to be provided having an oriented polyamide layer as a tension layer. A thermoplastic layer, which essentially consists of polyetheramide block copolymers or copolyamides, or a rubber layer having as high an adhesive strength as possible is arranged on the polyamide layer in the form of a laminate. It is not necessary to apply an adhesion promoter coating to the oriented polyamide layer or the rubber layer or thermoplastic layer or to have a methylene donator for the production of the bond. The production of the fabric-free belt should be as economical as possible and said belt should have a long service life.
In the present invention, the polyamide layer is understood as meaning not only a layer of pure polyamides or polyamide blends but also a layer of polyamides or polyamide blends which have been given high impact tensile strength.
This object is achieved by the fabric-free belt according to the invention, and by the process, according to the invention, for the production of such a fabric-free belt.


SUMMARY OF THE INVENTION

The essential feature of the invention is that a rubber layer arranged on an oriented polyamide layer in the for

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Fabric-free belt does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fabric-free belt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fabric-free belt will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1148371

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.