Method for monitoring hot-adhesive properties of composite membrane materials for pharmaceutical packaging
The cold granules are generally packaged in single doses. The packaging process of the production line is mostly bag-filling-sealing. In this process, the thermal adhesive strength of the packaging materials is related to the overall sealing performance of the finished packaging. An important factor in the rate of broken bags. In this paper, Labthink's HTT-L1 hot-adhesive tensile tester is used to test the hot-adhesive properties of a brand of cold-plated aluminum alloy composite film, and the principle, parameters, scope of application and test process of the equipment are introduced. Provide a reference for determining the appropriate heat seal parameters and hot tack strength.
1, meaning
The cold granule is a common powdered or fine granule drug. In order to ensure the accurate dosage of the drug, a single dose package is used. The packaging form generally completes the sealing and filling of the packaging bag at the production site of the medicine, that is, the packaging film is first sealed into a packaging bag, and then the medicine is filled along the unsealed end of the packaging bag, and finally sealed. Since the filling and packaging of the package is only a few seconds apart, and as the production efficiency increases, the time interval between the two processes is shorter or even completed at the same time, so when the drug is filled, the heat is sealed. The temperature is not cooled to room temperature. At this time, the two edges are bonded to each other with a low degree of fastness, and the heat-sealing strength when the heat-sealed edge is cooled to room temperature is not reached, and the filled medicine has a certain impact on the heat sealing. If the bonding strength of the heat sealing edge is low, it is easy to break the bag under the impact force of the medicine, or the heat sealing edge is damaged, which affects the overall sealing performance of the packaging bag.
The bonding strength when the temperature of the heat sealing has not been lowered to room temperature is called hot bonding strength, the thermal bonding strength is similar to the heat sealing strength, and the strength value is very high with the heat sealing parameters, the heat sealing layer material, the thickness and the like. Great relationship, therefore, after the packaging material has been determined, how to adjust the heat sealing parameters to achieve the best value of the thermal adhesive strength of the packaging bag is an important measure to reduce the bag breaking rate of the finished product packaging and improve the sealing performance of the packaging. .
Figure 1 Common cold powder packaging film and bag form
2, test basis
The domestic method standard for hot tack strength testing is in the process of being developed. The test procedure is based on the American standard ASTM F1921.
3, test samples
The sample tested in this article is an aluminized composite film for a brand of cold granule packaging.
4, testing equipment
The test equipment used in this test is HTT-L1 hot-adhesive tensile tester, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 HTT-L1 hot-adhesive tensile testing machine
4.1 Principle of the test
The hot tack strength test is the bond fastness after the sample is heat sealed and has not been cooled to room temperature. Therefore, the time interval from the completion of the heat seal to the start of the strength test should be strictly controlled. It is difficult for the ordinary tensile tester to satisfy this. Requirement, the device integrates two test functions of heat seal and strength test. After the sample is heat sealed, the strength value is tested immediately after the set time interval. The heat sealing parameters of the equipment, including heat sealing time, heat sealing pressure and heat sealing temperature, can be set freely. Therefore, by setting different heat sealing parameters, the hot tack strength of the test sample under various parameters can be tested. The best heat sealing parameters and the hot tack strength under these conditions.
4.2 Equipment parameters
The heat sealing temperature is controlled from room temperature to 250 °C, the temperature control accuracy is ±0.2 °C; the heat sealing time is controlled from 0.1s to 999.9 s; the heat sealing pressure is controlled from 0.05 MPa to 0.7 MPa.
The load range of the device is 0 ~ 200 N. It can also be configured with 30 N, 50 N, 100 N according to the actual test requirements. The test accuracy is 1 and the resolution is 0.01 N.
The separation speed of the fixture is 100 mm/min, 150 mm/min, 200 mm/min, 300 mm/min, 500 mm/min.
The device has a stroke of 500 mm.
The equipment provides four test functions of hot tack, heat seal, peeling and tensile to meet different test needs of users.
The digital PID temperature control technology can not only reach the set temperature quickly, but also effectively avoid temperature fluctuations.
Manual and pedal two test start modes and anti-scald safety design can effectively ensure the convenience and safety of users.
The equipment is equipped with automatic functions such as automatic zeroing, fault indication, overload protection, and stroke protection to ensure user safety.
4.3 Scope of application
(1) This equipment is suitable for testing the thermal adhesive properties, heat sealing properties and tensile strength of plastic film, sheet, composite film, etc., such as instant noodle bags, milk powder bags, liquid milk bags, laundry powder bags, cold granule bags, etc. , pharmaceutical, daily chemical packaging bags, can also be applied to the composite film, self-adhesive, adhesive tape, adhesive composites, composite paper and other materials peel strength test.
(2) This equipment can meet many national and international standards such as ASTM F1921, ASTM F2029, QB/T 2358, YBB00122003.
5, the test process
(1) 35 specimens with a width of 15 mm and a length of approximately 35 cm were cut in the longitudinal direction of the sample.
(2) Set test parameters such as heat seal pressure, heat seal time, heat seal temperature, jig separation speed, and delay time.
(3) Take a sample and clamp it in the two fixtures of the device. The hot cover of the sample is upward.
(4) After the set heat sealing temperature is reached, the sample is pressed between the two heat seal heads with a special sampling knife, and the sample is heat-sealed by stepping on the foot switch. After the heat sealing is completed, and the set delay time is reached, the equipment fixture automatically separates according to the set fixture separation speed, and the sample is tested for strength, and the test result is reported after the test ends. The initial heat sealing temperature of this test was set to 120 ° C, and the temperature difference was increased by 5 ° C, and 5 samples were tested at each heat sealing temperature.
6, test results
In this test, the hot-adhesive strength of the samples at the heat-sealing temperatures of 120 ° C, 125 ° C, 130 ° C, 135 ° C, 140 ° C, 145 ° C, and 150 ° C was tested. The test results showed that the samples had hot tack strength. The maximum value was between 135 ° C and 145 ° C, which was 4.651 N/15 mm, 4.806 N/15 mm, 4.737 N/15 mm, and the surface of the sample was flat. At 150 ° C, the hot tack strength decreased to 4.406 N. /15mm, the shrinkage of the sample heat seal appeared. Therefore, the optimum heat sealing temperature of the sample is 135 ° C ~ 145 ° C.
7. Conclusion
For the products using the bag-fill-seal process, the hot-adhesive strength of the soft plastic packaging material is an important performance that affects the bag breaking rate and the sealing performance of the package. This paper takes the aluminum-plated composite film for a cold granule packaging as an example. The process of testing the hot-adhesive strength by HTT-L1 hot-adhesive tensile tester is introduced. The whole test operation is highly intelligent, and the test results are highly reproducible and accurate, which can truly reflect the hot-adhesive properties of the sample. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in the R&D and production of packaging testing equipment. It always aims to meet the needs of customers and continuously introduces practical, intelligent, accurate and high-end testing equipment to the market. Covering the packaging material production industry, food industry, pharmaceutical industry, daily chemical products industry, automotive, third-party testing structure and universities, research institutes and other industries, fields, understand the relevant testing equipment, you can log in to see! , the more trust! Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry!
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