400t bottom cylinder cold press for plywood hydraulic pre press machine

  What determines the cold pressing time of plywood

  The plywood cold press is driven by a hydraulic system. The stacked glued plywood billets 

are neatly placed on the lower pressing plate.The hydraulic cylinder drives the upper pressing

 plate to move down steadily and apply high pressure to the board stack at normal temperature. 

Under continuous static pressure, the air between veneer layers is squeezed out, the glue layer 

is evenly compacted, and each veneer is closely bonded for initial sizing and curing.

After pressure holding for a set time, the cylinder resets upward, and the pressed boards are

 unloaded for subsequent hot pressing processing.

according the different plywood type and the glue type ,the cold press machine working time 

is different from 20 mins to  2 hours .detailly as following :

1. Type of adhesive Different glues such as urea-formaldehyde glue, phenolic glue and melamine glue
   have different curing speeds. Faster curing means shorter cold pressing time.
   
   
2. Veneer thickness and plywood layers Thicker veneers and more stacked layers
   require longer cold pressing holding time.
   
   
3. Ambient temperature and humidity ,Lower temperature and higher workshop humidity
   slow down glue curing, so the cold pressing time needs to be extended.
   
   
4. Glue application amount ,Excessive glue amount slows down curing of the glue layer and
   requires longer pressing time; moderate and even gluing can shorten the time.
   
   
5. Cold pressing pressure,Higher pressure makes boards fit tighter and exhaust air faster,
   which can reduce cold pressing time; lower pressure needs longer holding time.
   
   
6. Wood material, Softwood and hardwood have different glue penetration rates.
   Hardwood with higher density usually needs longer cold pressing time.

Cold press machine specifications :

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