Abstract: Plaster is a commonly used topical drug. Adhesiveness is an important performance index of plaster, and it is an important factor that affects whether the efficacy of the drug can be properly played and whether it is convenient to use. In this paper, Labthink XLW (EC) intelligent electronic tensile testing machine adhesive plaster, and describes the principle of the test information, the basic steps of the test equipment and the like, reference for detection of the adhesive plaster enterprise.

Key words: adhesiveness, adhesion, peel strength, intelligent electronic tensile testing machine, plaster, medical packaging, soft plastic composite film

1 , meaning

Plaster is called thin paste. One kind of traditional Chinese medicine is to pour the drug into a gelatinous substance, which is applied on the side of cloth, paper or skin. Then it is adhered to the affected part through the adhesive action of the peripheral part of the drug. It has anti-inflammatory, pain relief and go. Corrosion, muscle growth, convergence and so on. Adhesiveness is an important property of plasters. If the adhesiveness of the plaster is poor, that is, the adhesion of the plaster to the affected area is low, which may affect the penetration of the drug into the body or the irritation to the nerve endings. Good effect, even the phenomenon of plaster falling off; and the adhesive is too sticky, some adhesive components will stick to the skin when the plaster is taken from the affected area, or it may cause pain, or even appear Redness and swelling. Therefore, suitable adhesiveness is an important condition for exerting good efficacy of the plaster and convenient and comfortable use of the patient.

Figure 1 plaster

2 , the status quo

The performance indicators for characterizing the adhesiveness of plasters include initial tackiness, stickiness, peel strength, etc. The relevant test methods are specified in the Chinese Pharmacopoeia, YY/T 0148-2006 " General Requirements for Medical Tapes ", and this article is based on YY/T. 0148-2006 " General Requirements for Medical Tapes " test the peel strength of the plaster.

3 , test samples

A brand of plaster.

4 , test equipment

This paper uses the XLW (EC) intelligent electronic tensile testing machine independently developed by Jinan Languang Electromechanical Technology Co., Ltd. to test the peel strength of the plaster samples.

Figure 2 XLW (EC) intelligent electronic tensile testing machine

4.1 Equipment Principle

The device is equipped with upper and lower chucks. The chuck is used for clamping the sample. The upper chuck can be moved according to the preset test speed of the device. The lower chuck is fixed. During the test, the two ends of the sample are respectively clamped on the upper and lower chucks, and the two chucks are moved relative to each other. The force value sensor disposed on the upper chuck and the displacement sensor disposed inside the machine will record the sample in real time. The force value and displacement generated during the process, so that Zui finally calculated the tensile, tearing, peeling force, deformation rate and other performance indicators of the sample.

4.2 Scope of application

(1) The equipment is suitable for basic performance tests such as 90 degree peeling, 180 degree peeling, tensile properties, tensile strength, tear resistance and heat seal strength.

(2) Through the special customization of the fixture, the device can also be used for film puncture resistance, puncture resistance of infusion bag, puncture / pull force of soft rubber stopper , tearing force of oral liquid cover, puncture / pull force of oral liquid cap , the brush pull strength, jelly cup and yogurt cup opening force and other products, packaging performance testing.

(3) This equipment complies with 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 , More than 20 items such as GB/T 17590 , ASTM E4 , ASTM D882 , ASTM D1938 , ASTM D3330 , JIS P8113 , QB/T 2358 , QB/T 1130 .

4.3 Equipment parameters

• The range of the device is 50 N and 500 N , and the accuracy of the test is better than 0.5 .
• The equipment supports the two-way test mode of tension and pressure, that is, the process and return test speed can be set separately, and there are seven test speeds that can be freely set according to the standard requirements, 50 mm/min , 100 mm/min , 150 mm/min. , 200 mm/min , 250 mm/min , 300 mm/min , 500 mm/min .
• The movable travel of the clamp is 950 mm .
• The device integrates eight independent test procedures, including stretching, peeling, tearing, and heat sealing, providing users with a choice of test items.
• The equipment uses a pneumatic method to hold the sample to prevent the sample from slipping, which ensures the accuracy of the test data.
• The device ensures intelligent operation of the user through intelligent configuration such as limit protection, overload protection and automatic return.
• The equipment is equipped with professional testing software, which supports the analysis and display of group test data, and has the function of multi-unit conversion of test results.
• Support Lystem ^TM laboratory data sharing system to achieve unified management of test data.

5 , test steps

(1) Five pieces of a sample having a width of 25 mm were cut out from the adhesive portion of the plaster sample .

(2) Remove the protective layer of the sample, paste the sample in the center of the clean stainless steel plate, and keep the other end of the sample not attached to the stainless steel plate ( free end ) . The two sides of the sample should be the two long sides of the stainless steel plate. parallel.

(3) Rolling the sample surface four times in the longitudinal direction with a roller, and then placing the sample for 10 minutes.

(4) The free end of the sample and the stainless steel plate are respectively clamped in the upper and lower chucks of the device, so that the peeling surface coincides with the center line of the upper and lower jigs. (If necessary, increase the length of the free end of the sample by means of lap joints, etc.)

Figure 3 loading process

(5) Set the test speed, sample width and other parameter information, click the test option, the test starts, the sample peels off, the equipment records the force value and curve during the stripping process in real time. After the test, the equipment automatically calculates the peel strength of the sample. .

6 , test results

The peel strength test results of the five samples taken from the 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 the plaster is an important property. The adhesive strength of the plaster is characterized by testing the peel strength of the plaster. XLW (EC) intelligent electronic tensile testing machine can be used for the test of peel strength of plaster. The test results are reproducible and accurate, and can truly reflect the adhesiveness of the plaster. In addition to the peel strength of the plaster, the device can also be used for the peeling strength of the adhesive tape, the peel strength of the soft plastic packaging composite film, the heat sealing strength of the packaging bag, the tensile property, the puncture resistance and the like, and the application thereof. The range is extremely wide. Labthink is committed to providing professional testing equipment and services to customers around the world. For more information, you can visit Jinan Languang Company or call us . The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry.

Copyright statement: Article Copyright Jinan Languang Electromechanical Technology Co., Ltd., reprinted without permission!

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