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Operating procedures
Requirements for the use of plastic suction
The absorbance is two-component gum, and the activation temperature is about 60 ℃. The storage environment temperature should be 5 ℃, 30 ℃ and below 5 ℃. The roller shall not be placed directly on the ground, but on a wooden support, especially in winter. The validity period of plastic absorbability is not disassembly, but 6 months from the date of delivery.
Main agent: curing agent=20:1. When the main agent and curing agent are mixed, the mixing state shall be maintained. Slowly add the curing agent and stir for at least 3 minutes. The amount of glue produced within 4 hours shall be used each time. Glue should be glued well.
Requirements for painting process:
The spraying sequence is end face front line front+line end face, and the plane part can be sprayed; The plane of the end face shall be sprayed twice.
The activity time between the main agent and curing agent is 4 - 6 hours, and the workpiece sprayed with adhesive should be completed within 4 hours to obtain the best adhesion effect. Otherwise, the activation temperature needs to be increased through rubber crosslinking reaction. Although the external agglutination effect is good, the heat resistance is significantly reduced. If the secondary spraying occurs on the PVC film surface.
After spraying, the surface is white and dry. The drying time is 30 to 50 minutes (depending on the ambient temperature, humidity and glue quality).
The ordinary fan is 1.5 - 2.0 meters away from the workpiece, and the moist air is blown away to avoid PVC bubbles generated by high humidity of the workpiece.
In winter, in order to increase the temperature of the workpiece, the small insulation construction workpiece can be heated to 20 to 25 ℃ (the temperature is not allowed to exceed 35 ℃, otherwise deformation will occur). The glue spraying shall not be lower than 16 ℃ ambient water.
Operators shall wear masks to protect their health.
Application of silica gel membrane in suction molding machine
According to the characteristics of the workpiece, such as arc value, corner, line width, depth, etc., different thickness of silicone film is selected.
Due to the continuous heating and stretching of the silicone membrane, its droop will increase, and the droop should be reduced according to the droop of the silicone membrane.
In order to prolong the service life of the silicone film and prevent the quality of the workpiece, the silicone film should be replaced regularly, such as the front end and the left end.
If the corners of the silicon film have holes or short cracks, they can be repaired by the silicon gel and film repair machine. After repair, the compaction weight is straight. After 24 hours of drying, 240 # sandpaper can be used normally.
Process parameter setting
Space between film pressing workpieces: narrow and long workpieces with width less than 10cm, the space between workpieces shall not be less than 8cm, and workpieces with width greater than 10cm shall not be less than 6cm. The distance between the workpiece and the surface boundary shall not be less than 8cm. The longitudinal spacing shall be in a straight line to reduce airflow resistance.
The width and length of the work-piece plate shall be 6 - 10 mm less than the width and length of the work-piece. The plate on the edge surface shall be rounded with a radius of 3 mm - 5 mm, or rounded with an angle of 3 x 45 ℃. In order to ensure that the PVC film and air between work-pieces are completely injected, the PVC film shall be firmly stuck to the edge of the work-piece. The washer thickness is about 3/4 of the workpiece thickness, which is one of the important measures to ensure that PVC is not pulled white.
Set temperature: According to different PVC films, the set temperature should be between 130 ℃ and 160 ℃. The temperature of ordinary PVC films (compared with smooth PVC films) should be higher, highlighting that PVC films should be lower (to avoid loss, because the temperature is too high).
Assembling time: The preheating time should be from the 1930s to the 1950s (the color of PVC film is different, the preheating time should be different, the light color should be appropriately extended, the dark color should be appropriately shortened; the thickness of PVC film should be appropriately extended, and the thin PVC film should be appropriately shortened), the vacuum time should be in the 1980s, and the pressure should be preheating time+the 10-20s. The time to reach the set pressure should not be too long, it should be 5s, to ensure that the above workpiece end face reaches the activated Marble Grain PVC Decorative Film Factory and substrate temperature and quickly sticks down without overstretching the workpiece PVC film (i.e., not line)
Set pressure: set positive pressure to 3.8 bar - 4.2 bar, negative pressure to 0.7 bar - 0.8 bar, positive pressure+negative pressure=4.5 bar - 5.0 bar.
If the workpiece is too thick, it highlights that the thickness of PVC film is less than 0.3mm. If the thickness of PVC film is less than 0.3mm, the set temperature should be appropriately reduced, the preheating time should be increased, the height of the bench on the whole floor should be increased, and the distance between the workpiece and the heating plate should be shortened to reduce or avoid the change of PVC film.
Trimming requirements
The workpiece processed by the press shall be placed for 20 minutes (to ensure the initial curing of the adhesive) before trimming.
After trimming, use special tools to scrape edges and corners or use 120 ＃ - 180 ＃ sandpaper to chamfer, so that the PVC film is lower than the workpiece surface. Clean the glue mark on the back with thinner such as alcohol. The quality shall be checked during trimming. Repairable parts shall be repaired on the spot, and those that cannot be repaired shall be selected for further treatment.
The workpiece after membrane pressing shall be placed face to face and back to back on a flat material rack. 50 pieces in a stack, with heavy objects pressed on it to prevent deformation of the workpiece. The display time should not be less than 24 hours. It takes 24 hours for the film pressing workpiece to reach the intermediate curing, and it takes 7 days for the workpiece to be fully cured, so it is necessary to ensure that the workpiece is stored for more than 24 hours before packaging.
Dilong Yongfu decorative film is widely used in automotive interiors, public places, floors, wall panels, doors, furniture, kitchen cabinets, speakers, integrated ceiling, whole house custom and outdoor curtain wall, roof color steel tile pressing and so on. Features include: indoor and outdoor weather resistance, scratch resistance, super sub, antibacterial, net taste, waterproof, etc., can meet different levels of environmental protection requirements.
