An introduction to the test method of the adhesive properties of plaster patches

Abstract: plaster is a kind of commonly used external medicine Adhesive is an important performance index of plaster, and it is an important factor that affects whether the efficacy of plaster can play normally and whether it is convenient to use In this paper, Labthink blue light XLW (EC) intelligent electronic tensile testing machine is used to test the stickiness of plaster, and the testing principle of the equipment, the basic steps of the test and other information are introduced, which provides a reference for enterprises to test the stickiness of plaster Key words: adhesive, adhesion, peel strength, intelligent electronic tensile testing machine, plaster, pharmaceutical packaging, soft plastic composite membrane 1 Significance Plaster was called thin paste in ancient times One of the external uses of traditional Chinese medicine is to boil the medicine into a gelatinous substance and apply it on one side of cloth, paper or skin Then, it can be pasted on the affected area through the adhesive effect of the surrounding parts of the medicine, with the functions of anti-inflammatory, analgesic, decaying, muscle building, astringent, etc Stickiness is one of the important properties of plaster If the stickiness of plaster is poor, that is, the adhesive force of plaster on the affected area is low, it may affect the permeability of drug to the body or the stimulation of nerve endings, and it can not play a good effect, or even the phenomenon of plaster falling off occurs If the stickiness of plaster is too high, some stickiness components will be pasted on the skin when the plaster is taken from the affected area On, or make people unbearable pain, and even there will be swelling phenomenon Therefore, the appropriate adhesive is an important condition to give full play to the good efficacy of the plaster and the convenience and comfort of patients Figure 1 plaster 2 The current performance indicators of plaster viscosity include initial viscosity, holding viscosity, peel strength, etc relevant test methods are specified in Chinese Pharmacopoeia and YY / T 0148-2006 General requirements for medical tape This paper tests the peel strength of plaster according to YY / T 0148-2006 General requirements for medical tape 3 Test sample a brand of plaster 4 In this paper, XLW (EC) intelligent electronic tensile testing machine developed by Jinan Languang Electromechanical Technology Co., Ltd is used to test the peel strength of plaster samples Fig 2 the principle equipment of XLW (EC) intelligent electronic tensile testing machine 4.1 is equipped with upper and lower collets, which are used to hold the sample The upper collet can move according to the preset test speed of the equipment, and the lower collet is fixed During the test, the two ends of the sample are respectively clamped on the upper and lower chucks, and the two chucks do relative movement The force value sensor configured on the upper chucks and the displacement sensor configured inside the machine will record the force value and displacement generated in the process of change in real time, so that Zui can calculate the tensile, tearing, peeling force, deformation rate and other performance indexes of the sample 4.2 scope of application (1) the equipment is applicable to the basic performance test such as 90 degree peel, 180 degree peel, tensile property, breaking force, tear resistance, heat sealing strength, etc (2) Through the special customization of the fixture, the equipment can also be used to test the performance of film puncture resistance, infusion bag puncture resistance, soft rubber cork puncture / pull-out force, oral liquid cap tear off force, oral liquid cap puncture / pull-out force, toothbrush brush brush pull-out force, jelly cup and yogurt cup opening force and other products and packages (3) The equipment conforms to a number of national and international standards, such as ISO 37, GB 8808, GB / T 1040.1 ~ GB / T 1040.4, GB / T 1040.5, GB / T 4850, GB / T 2790, GB / T 2791, GB / T 17590, ASTM E4, ASTM d882, ASTM D1938, ASTM d3330, JIS p8113, QB / T 2358, QB / T 1130, etc 4.3 there are two range specifications of equipment parameters: 50N and 500N The accuracy of test is better than 0.5 level The equipment supports pull and press two-way test mode, i.e the process and return test speed can be set respectively, and there are seven test speeds that can be set freely according to the requirements of the standard, including 50 mm / min, 100 mm / min, 150 mm / min, 200 mm / min, 250 mm / min, 300 mm / min and 500 mm / min The movable stroke of the clamp is 950 mm The equipment integrates eight independent test procedures, such as stretching, peeling, tearing and heat sealing, and provides users with a variety of test options The equipment adopts the pneumatic way to clamp the sample, to prevent the sample from slipping, and to ensure the accuracy of the test data The equipment is equipped with intelligent configuration such as limit protection, overload protection and automatic return to ensure the operation safety of users The equipment is equipped with professional test software to support group test data comparison, analysis and display, and has the function of multi unit conversion of test results Support Lystem TM laboratory data sharing system to realize unified management of test data 5 In test step (1), cut 5 pieces of 25 mm wide plaster samples from the sticky part of the plaster samples (2) Remove the protective layer of the sample, paste the sample in the center of the clean stainless steel plate, keep the other end of the sample from sticking to the stainless steel plate (free end), and both sides of the sample shall be parallel to the two long sides of the stainless steel plate (3) Roll the surface of the specimen four times along the length direction with a roller, and then place the specimen for 10 minutes (4) Clamp the free end of the sample and the stainless steel plate in the upper and lower chucks of the equipment, so that the peeling surface coincides with the center line of the upper and lower clamps (if necessary, increase the length of the free end of the sample by lapping and other means) Figure 3: sample loading process (5) set the test speed, sample width and other parameter information, click the test option, the test starts, the sample is peeled, the equipment records the force value and curve in the peeling process in real time, after the test, the equipment automatically calculates the peeling strength of the sample 6 The results showed that the peel strength of five plaster samples were 7.01 n / cm, 6.98 n / cm, 6.87 n / cm, 6.95 n / cm and 7.03 n / cm, respectively 7 Conclusion the adhesiveness of plaster is an important property In this paper, the adhesiveness is characterized by testing the peel strength of plaster XLW (EC) intelligent electronic tensile testing machine can be used to test the peel strength of plaster The test results have good repeatability, high precision and can truly reflect the stickiness of plaster In addition to the peel strength of plaster, the equipment can also be used to test the peel strength of adhesive tape, the peel strength of soft plastic packaging composite film, the heat sealing strength of packaging bag, tensile property, puncture resistance and other properties, with a wide range of applications Labthink Languang is always committed to providing professional testing equipment and services for customers around the world To learn about relevant information, you can log in Jinan Languang company to check or call for consultation The more you understand, the more you trust! 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