(b) Base paper

The base paper is made of cellulose and does not have thermoplastic properties. Many plastic materials that are suitable for ultrasonic bonding technology are due to their inherent thermoplasticity and the bonding effect achieved by heating the fixed location. The team conducted a study to establish a bond between two sheets of paper. .

The researchers first tested different paper grades under various production parameters to determine their suitability for ultrasonic bonding techniques and to understand and clarify the bonding mechanism. The researchers also produced some samples as required by the Paper Bow Long Research Institute and analyzed the results of ultrasonic bonding tests. Pulps containing defined fibres are thus produced (including bleached and unbleached pine pulp and mechanical wood pulp B. 100% mechanical pulp, 50% bleached and 50% mechanical pulp mixed pulp.

Then the test on the sample. Measurement conditions include loading pressure, exposure time, and vibration amplitude—including humidification, non-wetting, or addition of paste—the primary purpose is to determine which parameters have an effect on board production. Preliminary results show that proper addition of paste and moisture is required for The bond strength is very important. It is impossible to achieve the ideal adhesion effect by ultrasonic technology alone.

In the second series of tests, four different dilutions of the paste were applied to the paper surface and then ultrasonically bonded under specific conditions. The peel strength test was used to determine the bond strength in each case and the results are as follows

On paperboard that has not been subjected to any wetting or that does not contain any paste, even if the paperboard is rich in lignin, it is impossible to achieve an adhesive effect completely using ultrasonic technology.

Cardboard containing a certain amount of moisture and paste can be bonded using ultrasonic technology, and the adhesive strength is dependent on the situation.

(3) Ordinary core paper and face paper test

The third group of test objects are plain core paper and face paper. Test results have reference value. The sample adhesion condition in FIG. 3 is for the adaptability of ultrasonic bonding.

In the primary testing stage, a variety of ultrasonic application times, static bonding pressures, and vibration amplitudes were used to define process parameters. The next series of tests used dry paperboard (usually natural moisture content 5% to 8%), and the crucible type was C, and then added moisture on these papers. A total of more than 550 cardboard samples were used for ultrasonic testing. TAPPI T82 was used for the determination of the adhesive strength of the paperboard. L standard; éš¹ (adhesion strength measurement standard).

The first is a "dry" test (ie no humidification of the paperboard). The result is either that the adhesive strength is poor or that the board burns. Test results show that the longer the paperboard is exposed to ultrasonic waves, the greater the pressure of contact, and the corresponding increase in adhesive strength. The best bond strength obtained was 26% of the conventional paste dosage, and the exposure time was 0.1 second, which produced a 100 times higher bond strength than the conventional production conditions.

(to be continued)

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