The "wet" test (ie humidifying cardboard) is much more complicated. Due to the exposure time of 0.06 seconds, it limits the use of equipment. The test results show that the shorter the exposure time of the cardboard under ultrasound, the higher the contact pressure and the higher the adhesive strength. Reducing the amplitude will only have a small effect on the bond strength. Through the above test is not difficult to draw the following conclusions:
For ordinary base paper, moisture is a key factor in obtaining sufficient adhesive strength; special base paper may, under certain conditions, may not require a special humidification process to achieve a suitable adhesive strength.
The core paper used differs from the tissue paper in terms of the strength of the bond. The pressure strength and the exposure time will also affect. The adhesive strength was measured by optical and electron microscopy to determine the adhesive gap and infrared spectrograph. The results were as follows:
The bond strength produced by ultrasonic technology is greatly affected by the paste activation of the paper. The adhesion of the tip portion of the core paper prior to bonding is also critical. All the tests showed that the ultrasonic bonding technique and the paste play an important role in bonding the core paper and face paper.
The interlacing between paper fibers also has little effect on adhesion. Photographs taken through an electron microscope are not difficult to find, the fibers in the gap have changed to vertical direction. The application of ultrasonic vibration technology allows the fibers to rearrange and interweave. (See Figures 3 and 4)
The effect of lignin on adhesive strength is very small. Based on past research, it has been found that the free hydroxyl groups in the fiber molecules in adhesive tissue and core paper have little chemical effect on the paperboard. During the ultrasonic bonding process, the paper fibers have been changed and will not expand in the future.
After the humidified cardboard was tested using a microtome slicer, no cavitation or microscopic ejection holes were formed. (See Figures 5 and 6)
(to be continued)
Grinding wheel lighters, flint lighters, lighter categories, lighter factories, lighter manufacturers, lighter manufacturers, lighter wholesalers, lighter craftsmanship
Grinding Wheel lighter,Flint lighter,Lighter Category,Lighter Production,Lighter process
GuangDong Feituo Automation Technology Co., Ltd. , https://www.feetoolighter.com