There are a variety of problems that may occur during the use of laminating machines, and the following are some common problems and their possible causes
First, the quality of coated goods
Coated products hair warp
reason
The print is too thin, which is prone to problems when laminating the thin paper.
Tension imbalance, need to adjust the film tension.
The compound pressure is too large, and it is necessary to reduce the compound pressure.
The film tension is too large or the winding tension is too large, resulting in deformation of the film and the print.
The environmental humidity is high or the drying time is short, and the coated goods are not fully dried.
Solution: For specific reasons, adjust the print selection, tension, compound pressure, film tension, winding tension and control the ambient humidity and drying time.
There are snowflake spots on the merchandise
reason
The print is too powdered to be completely dissolved by the adhesive.
The amount of glue is too small, and snow spots appear on the entire surface of the print.
Improper pressure of the pressure roller squeezes out the adhesive resulting in snowflake spots on the edges.
There is a dry rubber sheet on the coated roller or a rubber ring on the pressure roller.
Impurities in the adhesive or poor environmental hygiene.
Solution: increase the amount of glue, clean the printing powder, adjust the pressure of the pressure roller, clean the glue roller and pressure roller, filter the adhesive and pay attention to environmental hygiene.
Goods have bubbles
reason
The printing ink layer is not dry.
The temperature of the laminating machine is not properly controlled and the temperature is too high.
The working humidity is not suitable.
Coated film rolls are of poor quality and contain air bubbles.
Solution: Hot press once and then glue, reduce the temperature of the laminating machine, adjust the humidity of the working environment, and replace the high-quality laminating film roll.
The bond at the edge is not solid
reason
The thick paper is bent and deformed during winding, and the edge is pushed open by the bent paper.
Solution: Reduce the width of the edge and ensure that the width of the bonding is not solid within the range of the die cutting mouth.
The goods don't stick well
reason
The selection of adhesive is not appropriate, the amount of glue is not set properly, and the ratio measurement is wrong.
The surface of the printed product is not in good condition, such as powder spraying, too thick ink layer, ink is not dry or dry.
Adhesive is absorbed by ink and paper, resulting in insufficient coating amount.
The amount of glue is too little, the solid content is too little, and the bonding force is insufficient.
Glue deterioration or film beyond shelf life.
Solution: re-select the type and dosage of adhesive, accurate ratio; Wipe off the spray powder, increase the amount of adhesive coating, increase the pressure, choose the photohot pressing once and then glue, use the adhesive with high solid content, increase the temperature of the drying channel; Resetting the formulation and coating amount; Increase the amount of glue; Check the glue factory date and shelf life, replace the film.
Second, laminating machine equipment failure
The coated film roll cannot be loaded
reason
The laminating roll is installed incorrectly, knotted or stuck.
Improper adjustment of tension control device.
Coated rollers accumulate dust or dirt.
Solution: Check and install the film roll correctly, adjust the tension control device, and clean the film roll.
The film thickness is not uniform
reason
The coated roller is not clean and accumulates dirt.
The tension of the laminating material is improper.
The roll pressure of the laminating machine is set incorrectly.
Solution: Clean the drum regularly, ensure that the film material tension is appropriate, and adjust the roller pressure.
Machine does not start
reason
The input wire is blocked, the power cable is reversed, and the voltage is not enough.
Solution: Check the input wire and power cord to ensure voltage stability.
The temperature measurement is not accurate
reason
The thermocouple or temperature controller is improperly installed or damaged.
Solution: Check the installation of the thermocouple and temperature controller, and replace it in time if it is damaged.
The working vacuum does not come up
reason
The air circuit is blocked, and the hand valve or solenoid valve is not closed.
The motor belt of the vacuum pump is loose and the vacuum gauge is damaged.
Solution: Check the gas path, hand valve, solenoid valve and vacuum pump motor belt and vacuum gauge to ensure normal operation.
Main power switch trip
reason
Heating box top input wire leakage, distribution box leakage.
External wires on the equipment, the motor leakage.
Solution: Check the heating box top input wire, distribution box and external wires and motors to ensure that there is no leakage.
The suction film is not in place
reason
Insufficient vacuum, air leakage.
Not enough temperature, too thin film.
The workpiece is pasted on other materials, and the depth of the workpiece exceeds the pull of the film.
The coating time is too short, and the film does not pull up.
The workpiece is too close.
Solution: Check the vacuum degree, temperature, film quality and workpiece condition, adjust the suction time and workpiece distance.
The surface of the covered workpiece is folded and not smooth or the corner is not covered
reason
The membrane is not straightened.
The membrane quality is not good.
The workpiece is not polished well.
Too much glue sprayed.
The touch plate under the workpiece is too low.
Solution: Ensure that the film is straightened, select a good quality film, polish the workpiece, control the amount of glue spraying, and adjust the height of the touch plate.
3. Other common problems
The thickness of the plastic film is uneven
Solution: Replace the plastic film with uniform quality.
Film relaxation
Solution: Adjust the tension of the film to ensure that the film is tight.
The adhesive solidifies in the tank
Solution: Clean the glue tank regularly to prevent the adhesive from curing.
Roller imbalance or inconsistent pressure
Solution: Adjust roll balance and pressure consistency.
