First, the thermal bonding method. Start by preparing a flat and smooth wooden board that is 1.5 to 2 meters long, 5 to 6 centimeters wide, and 8 to 10 centimeters thick. This will serve as your backing plate. Nail thin iron screens onto it and secure it on a long workbench to prevent damage to the plastic. Use a plane to smooth out any uneven edges of the slats, ensuring a flat surface for better adhesion.
Next, align one edge of each of the two plastic films you want to bond with the wooden strip, overlapping them by about 4 to 5 centimeters. It’s best to have three to four people working together—two people will handle the "pair seam" on either side of the wood strip, while the third person places a kraft paper strip (about 8 to 10 cm wide and 1.2 to 1.5 m long) over the joint. Once the old newspaper strips are in place, use a preheated electric iron and slowly move it along the length of the wooden strip, applying even pressure. The heat from the iron, the downward pressure, and the speed of movement should all be adjusted so that the two films soften slightly under the paper, allowing them to bond properly. After the bonding is complete, carefully peel off the paper strips. A section of the film is then pulled toward the other end, and the process is repeated until the desired length is achieved.
When using this method, it's crucial to control the temperature of the iron. For polyethylene film, the ideal temperature is between 100°C and 110°C, while for polyvinyl chloride, it should be between 120°C and 130°C. If the temperature is too low, the bond may not be strong enough, leading to cracks. If it's too high, the film may melt, causing holes or thinning at the seams. The pressure applied and the speed at which the iron moves must also match the temperature. Higher temperatures require less pressure and faster movement, while lower temperatures need more pressure and slower movement.
If the pad becomes greasy, it means the temperature is too high and the plastic has started to melt. In such cases, don’t remove the paper immediately. Let it cool down first. Only when the paper is no longer hot should you proceed, ensuring a stronger and more reliable bond.
When repairing an old film, make sure the area around the joint is clean. Apply the newspaper with just the right amount of adhesion—too little and the joint may crack, too much and it could cause issues later.
Second, the adhesive bonding method. You can use perchloroethylene resin-based plastic adhesive to repair polyvinyl chloride films. For polyethylene films, polyurethane adhesive is recommended. Alternatively, small steel saw blades can be used for hot pressing, depending on the situation.
Third, the mud glue repair method. If the greenhouse film gets a small tear or wrinkle during use, you can cut a piece of plastic and apply some mud water to the damaged area to fix it temporarily. This method is useful for quick, on-the-spot repairs.
2022 New Laser Distance Sensor
At the start of 2022, JRT introduce our customers a batch of new series laser distance measurer sensor(S92-20m, S91, BA6A-150m, BA6A-20Hz, M703A-8Hz, U81-10m etc.). Especially S91(RS485 interface and software Rx Tx protocol) and S92(RS232 interface) ip54 enclosure distance sensor model, custoemrs would like to use it in their industrial automation solutions,according to the ip54 waterproof protection level, well protect laser, Wide Voltage 5~32V(Optimize for industrial using), and easy-to-install.
If you are interested in JRT more laser measuring sensors, or you would like buy qty 2 quotation for trial basis, please welcome to contact us.
Kind regards
JRT Team
Chengdu JRT Main Ranging Modules: Industrial Laser Distance Sensors, Laser Rangefinder Sensor , Tof LiDAR Sensors.
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Chengdu JRT Meter Technology Co., Ltd , https://www.jrt-measure.com