If you use paper packaging every day, do you know how to design and test scientific packaging? If you are a paper packaging producer, do you know how to produce a more economical and practical carton? The "Teach you to be a paper packaging expert" column has officially met you from now on. This column will be based on practical, easy-to-understand principles to help carton users and cartons to scientifically design carton structures, develop more functional carton boxes, reduce costs, and achieve a common increase in user and packaging manufacturing.
The basic purpose of transport packaging is to protect the product and ensure that the product performs its intended function when it is put into use. In other words, the packaging must enable the packaged product to be delivered from the factory and delivered to the user through transportation, storage, and handling. protection. Therefore, the packaging used must not only prevent the products from being damaged due to vibration and impact during transportation, but also prevent the harmful effects caused by nature, regions, etc.
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The packaging of the design must be qualified and reasonable. The first point that reflects the reasonableness of the product is to protect the value of the product and to facilitate handling, storage and transportation. The second point is that packaging must be economical.
The six-step cushioned packaging design proposed by Lansmont Inc. lists the ASTM standards that should be followed at each step. So far, the six-step method has not only been adopted by the American engineering community, but has been included in the American Packaging Engineering Handbook, and has been accepted by all countries in the world as a classical document for guiding packaging design.
The contents of the six-step method Determination of the circulation environment 2. Determine product characteristics 3. Redesign of the product 4. Select the buffer material 5. Packaging Design 6. The six-step test method for the package is used. â– The first step is to determine the circulation environment. The determination of the cruelty of the logistics environment is an important step in the buffer design. It mainly determines what kind of transport risks and dangerous conditions exist, including the accidental Drop, car vibration, impact, temperature and humidity limits, and stacking pressure, we are mainly involved in shock and vibration here, but other factors are also very important in the packaging design.
Impact shocks may occur at any point in the transportation process, with the most serious impact occurring at the handling stage. It includes the number of times a package is dropped during loading, unloading, and transfer. The most important thing is to know the height of the package that may fall.
It is inconceivable that vibration does not experience vibration during the transportation of a car. The rotation of the car engine and the rotation of the wheels also cause the vibration of the car. Uncertain vibrations can cause the reaction of the vehicle suspension system and deformation of the cabin. These uncertain vibrations may be periodic, and some vibrations may also be random.
The vibration in a real transport environment is extremely complicated. His vibration excitation is output in a frequency band in which various factors are mixed. Such vibration is usually considered as random vibration in the time domain because no one moment can be predicted. What will happen, however, from the frequency domain perspective, a vehicle can easily show extremely high levels (or strength).
In the process of transportation, stable vibration usually occurs at low frequencies. At low frequencies (3-5Hz), the most serious condition of the vehicle is the vibration of the vertical acceleration value 0.5g. In the vibration experiment, we choose the acceleration of the vibration table 0.5g is also positive. because of this.
â– Determine the product characteristics in the second step: Impact as the design basis We need to input such as: including the physical state, physical and chemical properties, to determine the packaging method used to determine the product's structural characteristics, such as size, weight, center of gravity, shape, etc. And the mechanical properties of the product, such as fragility, natural frequency, compressive strength, and so on. Vibration (looking for resonance point)
It is generally believed that vibrating at a frequency that is not sensitive to the product will not damage the product. Therefore, finding the sensitive frequency (resonance point) of this product is the key to packaging design. The purpose of vibrating the product is to find the product's natural frequency or resonant frequency.
â– The third step to improve the product: Based on the crispness of the product we tested, it is sometimes better to increase the strength of the product itself than to wrap it in an expensive package. We need to make a trade-off between the cost of the product, the reliability of the product, and the cost of the packaging. Sometimes, small improvements and redesigns of the product can increase the fragility of the product. Although the cost of each product is slightly higher, if the cost of packaging the product is greatly reduced, the cost of the entire package is also reduced. Relatively lower.
According to feedback from the manufacturer (or company) on the packaging design, the improvement of the product's feasibility will be greatly changed. For some companies, this feedback to package designers is an important step in the design of new products. This will enable them to have higher quality products and lower packaging costs.
â– Step 4: Assess Buffer Material Performance: Material properties should be provided by the manufacturer of the material. In special cases, these data must be measured by themselves. They include the ability of the material to absorb shocks and the transmission characteristics of vibrations.
Shock We know that the cushioning material can reduce the impact force transmitted to the product when the package is dropped. The impact cushioning curve is the description of how the impact force is transmitted through the material when different weights of goods fall onto the cushioning material. It is determined by the type, thickness, and drop height of the material.
The vibration curve of a vibration damping material describes the expansion and weakening of the vibration of the material at different frequencies, which is determined by the type and thickness of the material.
In general, the graph of the cushioning material tends to decrease as the static pressure load increases. This is determined by its buffering characteristics. As the static pressure increases, the cushioning force of the mass increases, and the natural frequency of the entire package decreases because the cushioning properties of the material are not changed.
Problems that should be noticed in the design of storage and transportation packaging
July 26 18:01:12, 2024
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