How to calculate the weight of pvc film according

For narrow and long workpieces with a width less than 100mm, the distance between the workpieces is not less than 80mm; for workpieces with a width greater than 100mm, the distance between the workpieces is not less than 60mm; and the distance between the workpiece and the worktable frame is not less than 80mm. The horizontal and vertical spacing should be in a straight line to reduce air flow resistance.

Workpiece backing plate: The width and length of the backing plate should be 6-10mm smaller than the width and length of the work piece. The edges and corners around the upper surface of the backing plate should be rounded with a radius of 3mm-5mm or 3×45°C corners to ensure The air between the PVC and the workpiece is completely exhausted to achieve the effect that the PVC is firmly glued to the edge of the workpiece. The thickness of the backing plate should be about 3/4 of the thickness of the workpiece, which is one of the important measures to ensure that the PVC is not drawn white.

Set temperature: According to the difference of PVC, the set temperature should be between 130℃-160℃. The temperature of ordinary PVC (compared to high-gloss PVC) should be higher, and the high-gloss PVC should be lower (to avoid loss of gloss due to high temperature) ).

Setting time: preheating time should be between 30s-50s (different PVC color, preheating time should also be different, light color should be appropriately lengthened, dark color should be appropriately shortened; thick PVC should be appropriately lengthened, thin PVC should be appropriate Shorten), the vacuuming time should be about 8s, and the pressurizing time should be the preheating time plus about 10-20s. The time to reach the set pressure should not be too long, it should be about 5s, to ensure that the PVC and the substrate are quickly adhered to the substrate when the end surface of the workpiece reaches above the activation temperature and does not excessively stretch the PVC on the workpiece.

Set pressure: Set the positive pressure to 3.8bar-4.2bar, and the negative pressure to 0.7bar-0.8bar, that is, positive pressure + negative pressure = about 4.5bar-5.0bar.

For over-thick workpieces, high-gloss PVC and thin PVC with a thickness of less than 0.3mm, the set temperature should be appropriately reduced, the preheating time should be appropriately increased, and the height of the entire bottom plate of the worktable should be increased to shorten the distance between the workpiece and the heating plate to reduce or avoid PVC discoloration problem.

When pressing thin wood (wood veneer), use milky white latex adhesive. The temperature of veneer should not be lower than 105°C; the higher the pressure, the better, but it takes longer to reach the set pressure, that is, slow pressure.

Five, trimming requirements

The workpiece processed by the press can be left for 20 minutes (to ensure the initial curing of the glue) before trimming.

After trimming, scrape the edges and corners with special tools or chamfer the edges with 120#-180# sandpaper to make the PVC lower than the surface of the workpiece. And use thinner such as alcohol to clean up the glue marks on the back. Check the quality when trimming, repair on-site if it can be repaired, and sort out those that cannot be repaired separately.

After film pressing, the workpieces should be placed face to face and back to back on a flat rack. A stack of 50 pieces, with heavy objects pressed on it to prevent deformation of the workpiece, and the storage time should not be less than 24 hours. It takes 24 hours for the film-pressed workpiece to reach the mid-term curing, and it takes 7 days to fully cure, so make sure that the workpiece is stored for more than 24 hours before packaging.