Distortion-free, uniform quality prepreg output can be ensured.

1. Minimizes product distortion
   By operating the plant with minimal web tension, weft slippage (distortion of texture net) and warp slippage(lateral shrinkage) can be minimized, and quality prepreg can be produced with a minimum of distortion.
2. Coats evenly according to resin properties
   After the prewetting device completely removes air from the web, and dipping rolls impregnate resin into the base material thoroughly and uniformly under low tensional condition. Precision squeeze rolls make the coated resin layer extremely even and uniform in both stream and wide directions of the running web. Coating system best suited to the properties of resin and base metal is used.
3. Controls web tension
   As described above, web tension greatly influences prepreg quality. The following measures are taken for web tension control:

   • Among various types of rolls, diverting rolls are used minimally.
   • The tension controller is designed so that web tension can be adjusted easily during operation. (Only input the tension parameter on the touch panel, which drives the dancer rollers through Electric-pneumatic Converter)
   • Special method achieves uniform tension over the entire process. (Dancer roll is installed between driven rolls; a unique combination of roll speed control and tension control systems.)

1. Unwinder
   A double-shaft turret type unwinder can easily align a web reel by shaftless-core chucking devices. Unwinding tension is set via inverter motor and air cylinder.
2. Bonding unit
   To bond the web ends, pushing the press start button after fitting hot melt tape, the web will be joined automatically.
3. Accumulator
   This is a device to accumulate extra web, being paid out during splice-pressing without any stop of web running.
   The web tention can be adjusted to the demanded value.
4. Pull-in unit
   This unit includes a tension control device. Web tension can be adjusted easily and continuously with the touch panel.
5. Pre-wetting unit
   This unit applies resin varnish from beneath the web. and effectively removes air from the fabric texture of the web. The kissing roll can be driven in any direction, or rotated freely to meet various product requirements. Pre-wetting time and pressure can be easily controlled.
   The timing roller is amounted on the exit of pre-wetting unit to discharge the void in web, basing on capillary tube phenomenon.
6. Impregnating unit
   The most important element for impregnating resin varnish into web. this unit automatically keeps resin varnish at a specified viscosity. As the unit provides sufficient dipping time with the minimum number of timing rolls, yarn slippage and air entrapment in the web are minimized.
7. Vertical type radiant curing oven
   After impregnation with resin, the web is dried and cured on both sides by far-infrared-rays radiant heat from radiation panel which maintain a uniform temperature distribution over the entire surface to assure uniform and effective web drying and curing.
8. Feed air sealing
   After being heated to predetermined tempera ture, fresh air is fed into the oven uniformly in a reverse direction and kept isolated from the top roll chamber.
9. Drying and curing oven
   The oven emits radiant heat evenly over the entire web surface. Contact or convective heat is also generated by air flow along the web.
10. Exhaust gas sealing
    Exhaust gas. discharged from the oven uniformly in a reverse direction, is kept isolated from the ambient air.
11. Top rolls chamber
    Provided with a cooling zone, this chamber cools the web with cooling air. Driven, water-cooled rolls reverse the web efficiently without resin adhesion.
12. EPC control unit
    By continuously monitoring web edge position via air nozzle sensors, the web is kept running at roll center.
13. Cooling unit
    This unit unwinds the web under precision tension control and cools it with water-cooled rolls.
14. Second accumulator
    This unit accumulates the web temporarily while rewinder rolls are replaced.
15. Pull-off unit
    This unit pulls the web off the second accumulator.
16. Rewinder
    Required for rewinding a very thin web.
17. Cutting unit (Optional)
    A rotary type cloth cutter. The blade rotates faster than web speed while the blade actually cuts the web. The lower blade is fixed. The rotary blade action is controled by NCcontroling device so that the cutting length is changable instantly and set at digital value. Even if at low speed and/or in case of thin materials, precise cutting is guaranteed.
18. Stacker and sheet depositor (Optional)
    Equipped with both air cushions and carrier arms, this device stacks on hydraulic lifter even thin product sheets precisely and rapidly without damage.
    (carrier arms are optional.)

High density far-infrared rays are used for radiant heating.

1. High efficiency radiant with far-infrared rays.
   Most resins have remarkable absorption bands in the far-infrared wave length range. SANWA’s radiant curing oven makes use of this principle. Far-infrared ray radiation heats the resin coat layers from the inside, for effective drying and curing, and at a high production rate.
2. Operation control in response to resin reactive characteristics.
   The radiant panels are divided into multiple zones in vertical direction of the oven. Plant operation can be controlled according to resin reactive characteristics and the qualitative characteristics of the product through precise thermal control of individual zones.
3. Uniform and stable drying and curing of coated layer.
   Uniform temperature distribution is obtained in the oven by feeding thermally controlled air in a transverse direction. Far-infrared radiant heat energy is absorbed evenly over the entire web surface. The energy penetrates deeply into the coated layer for even drying and curing.
4. Clean surface with no foreign matter adhesion.
   Product surface is free from foreign matters as is often seen in hot air forced blowing systems; thus finished surface accuracy can be greatly improved.
5. Also suitable for production of extremely thin materials.
   Constructed without internal protrusions, users will not experience such oven problems as slippage of base material texture due to contact or excessive tensioning of the web. This makes the oven best-suited to extremely thin prepreg production.
6. No need to suspend plant operations for maintenance purposes.
   Since hot air blowing nozzles are not needed, the oven does not undergo functional deterioration due to resin accretion. Moreover, there is no need for frequent and lengthy cleaning shutdowns.
7. Energy-saving design.
   The oven is designed to utilize heat most efficiently with the least exhaustive heat loss. Of modular design, the radiant panel can flexibly meet a variety of plant performance requirements.