CN EN
Cavipreg

With the high precision required by the impregnation process these systems represent engineering at the highest technical level. Carbon, glass and aramid fibers are impregnated with epoxy or phenolic resins using either solvent or hotmelt techniques.

CAVIPREG Prepreg machine

Prepreg machine

CAVIPREG can be used for the impregnation of various types of glass and carbon fiber materials, fabrics, nonwovens and papers, as intermediate products for PCB’s and for structural composites for the aircraft and space industry.

Lines to produce Prepregs made of fibers such as glass, carbon or aramid impregnated with polymer based resins as Epoxy or Phenol. Prepregs are base materials for composites for the Electronics industry (printed circuit boards), Aerospace and Aeronautics, Sporting goods and Wind energy industry.

Description

There are two ways to produce Prepregs: Hotmelt-based process and Solvent-based process. Hotmelts reach the necessary viscosity properties for a perfect impregnation just by temperature effect.

Matrix Film Production (Film Line):

Coating of release paper with resin
Coating by direct roll, reverse roll or knife coating

Impregnation/Transfer (Tape Line):

The reinforcement (UD-fibers of fabric) is between the two release papers

Transfer on the resin from the release paper into fibers, from one or from both side
Saturate the fibers by heating and consolidation

Pre Polymerization

The Prepreg can be produced in off-line mode with a separate film and tape line, or in-line mode with a combined film/tape line

The Solvent-based process is mostly utilized for Prepregs where resin viscosities are too high without adding solvents, even at higher temperatures. The reinforcements are generally fabrics. They are passing a solvet based matrix bath. The resin content is controlled by squeezing rolls. The impregnated substrate is heated in an IR Radiant dryer for Solvent evaporation and pre-polymerization of the resin. Radiant dryers are applying radiation of a specific wave length to enter the substrate, to effect drying and curing form the core to outside.

These two processes are in general applicable for Duroplastic Resin Systems. Thermoplastic Applications are made with the traditional Scatter Coating Process or with Water Based Systems.

Technical data

FILM LINE

Cavipreg-Filmline

Working width: 600 – 1600 mm
Working speed: 1 – 50 m/min
Type of resin: Hotmelt Epoxy
Coating weight: 10 – 250 gsm
Roll concentricity: +/- 0.001 mm
Roll cylindricality: +/- 0.001 mm
Temperature accuracy: +/- 1°C

VERTICAL TREATER

Cavipreg-Impregnating-line

Working width: 500 – 2000 mm
Working speed: 1 – 30 m/mim
Type of resin: Epoxy, Phenol, Polyamide
Type of solvent: Aceton, MEK, Toluol, etc.
Resin concentration: 25 – 50 %
Temperature accuracy: +/- 1°C

TAPE LINE

Cavipreg-Turm

Working width: 600 – 1600 mm
Working speed: 1 – 20 m/min
Type of resin: Hotmelt Epoxy
Line pressure: up to 35 kg/cm
Temperature accuracy: +/- 1°C
Working process: impregnation by transfer

Advantages

Holmelt Process

  • High precision coating weight by patented gap setting system (tolerance +/- 1 micron)
  • Automatic web handling systems for non-stop operation
  • Perfect impregnation rate by precise gap control and cylindricity of the rollers
  • High production speed by efficient consolidation

Solvent Based Process

  • Virtually no air inclusion in the Prepreg
  • Consistent curing from the core to the surface
  • Optimum precise control of heating circuits
  • Maximum energy efficiency
  • Largely maintenance free
  • High product quality at short curing time
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