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| HOW IS TAPE MADE? |
1.Carrier Materials
Common materials include films (which are typically made from regenerated cellulose, polypropylene or PVC), paper tissues, cloth or even metal foils and can be clear, colored or printed. The choice of material used as the carrier depends on what the tape is intended to do.
There are 2 main types of adhesives used for pressure sensitive tapes - rubber/resin and acrylic.
2.Make tape
There are 2 processes in the production of pressure sensitive tape; coating and slitting.
Coating: There are 3 main ways to do this. First, Solvent Coating; the adhesive materials are dissolved into a suitable solvent. The resulting relatively runny solution is coated onto the carrier and the solvent removed by passing it through a heated oven. Second, Water-based Coating; the adhesive materials are mixed with water to form an emulsion or dispersion. This is then coated onto the backing and the water removed through a heated oven in the same way as for solvent coating. Third, Hot-melt Coating; the adhesive materials are heated until they melt and coated as a hot liquid. The coated tape is then simply cooled to give the finished tape. These 3 coating techniques are frequently used to define pressure sensitive tape i.e. Solvent, Water-based or Hot melt. The following diagram shows the basics of the hot melt process:
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Slitting: The process has now made a 'jumbo'. This is what we call a huge roll of tape, perhaps 1.5m wide x 6000m long. It is the slitting process that turns the large jumbo into rolls for sale, in the sizes we all know. These could be anything from 12mm x 4m to 50mm x 66m. The jumbo is unwound onto a machine that contains a number of razor blades. The number and distance between these blades determines the width of the tape. The carrier passes over these blades cutting the tape into narrower widths and these are then wound on to cores to give the appropriate length for the finished rolls. |
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| Headquarters: |
Tel: 86-512-53996768
M-bile:86-13913761158
Fax: 86-512-53996762
E-mail: Service@atapeindustry.com
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