As a traditional dosage form in traditional Chinese medicine preparations, plaster (sticking agent) plays an important role in the medical field. It has a wide range of applications in the medical fields such as rheumatism, pain relief, elimination, and siltation. Plaster (sticking agent) is extremely easy to use, but the size of its adhesion (adhesive strength) plays an important role for consumers. For this reason, the National Pharmacopoeia tests the adhesion (adhesion) of plasters (stickers). The detailed regulations; the Pharmacopoeia stipulates that the adhesion (adhesion) of the plaster (adhesive) mainly includes three indicators: initial adhesion (initial adhesion), holding strength (stickiness) and peel strength.
Labthink is an excellent provider of inspection instruments and inspection services for many years, including medical and medical, food, daily chemical, packaging, printing, adhesives, automotive, petrochemical, environmental, biological, new energy, construction, aviation and electronics. The domain customers provide excellent and quality control solutions from Zui. In order to facilitate the major plaster (sticker) manufacturers to better understand the "measurement method of paste adhesion", the pharmacopoeia regulations and testing instruments are combined to introduce the testing items and test methods.
1. Determination of initial adhesion of plaster (sticker) (initial viscosity measurement)
Take Labthink's CZY-G initial tack tester as an example. The test principle is measured by inclined ball drop. The plaster initial adhesion test device is mainly composed of a slanting plate, a base, a stainless steel ball and a ball receiving box. First, adjust the inclined plate of the initial tack tester to 30 degrees from the horizontal plane, fix the adhesive side of the plaster (sticker) sample to the inclined plate of the initial tack tester, and place a stainless steel ball on the inclined plate. The steel ball is placed in the area and adjusted to the initial position, and the steel ball is released. The steel ball is rolled and passed through the viscous surface, and the initial viscosity is evaluated according to the Zui large ball steel ball which can be adhered according to the adhesive surface of the plaster.
Second, the plaster (sticker) holding adhesive (holding force) determination <br>Labthink blue light CZY-6S holding viscosity tester and YGJ-02 adhesive tape press roll machine, the test device by the viscosity test The instrument (including test frame, test plate, return plate), adhesive belt press roller machine is composed of two parts. The viscous surface (adhesive surface) of the sample is attached to the surface of the test plate and the loading plate, and is rolled back and forth three times using an adhesive belt press roll machine. After being placed for 5 minutes, the sample is placed vertically on the test frame, along the sample. A weight of a specified mass is suspended in the longitudinal direction, and the time during which the sample slips until it falls off is recorded.
Third, the plaster (sticker) peel strength determination)
Determined by the 180Â° peel strength test according to the Pharmacopoeia. Take Labthink's BLD-200S electronic peel tester or XLW smart electronic tensile tester as an example. The test process is as follows:
The plaster (sticker) backing was first fixed to the test panel with double-sided tape. If necessary, use tape to fix the edges of the upper and lower sides of the sample so that the sample fits flat on the plate. A clean polyester film was placed flat on the viscous side of the sample, and a 2000 g weight roller was used to roll 3 on the prepared sample to ensure that no bubbles were present at the bond. After the test article is pasted, it should be placed for 20~40 minutes before testing.
The free end of the polyester film was folded in half (180Â°), and the free end of the film and the test plate were respectively clamped up and down on the testing machine. Be sure to keep the peeling surface in line with the test machine line, set the test speed to 300mm/minÂ±10mm/min, start the test, and calculate the peel strength. The general unit is KN/m or N/mm.
The above is a brief introduction to the adhesion test method of plaster (sticker). Labthink hopes to communicate with the plaster manufacturer on the detection and quality of its adhesion.
Jinan Languang Electromechanical Technology Co., Ltd.: Jinan Languang Marketing Department:
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