By Jordan Brandes

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Extra resources for Contract Manufacturing and Packaging May-June 2011

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Here, the bonding surface can be surface/surface, sphere/sphere, parallel rods, or crossing rods. When the attracting force between quartz of 25–300 nm spacing was measured by atomic force microscopy (AFM), a research results showed that the force was in inverse proportion to the 3rd power of spacing. In other words, the intermolecular force influences more distance than a theory of van der Waals force [2]. 1 Different adhesion mechanisms in peel seal and tear seal. or “sticking together” of polymer molecules after the thermoplastic polymer materials are physically melted.

In this situation, the surface of the impulse sealant became overheated and caused thermal degradation. Since the applied current was excessive and the heat supply in the material was too strong, it became necessary to adjust the current to a lower value and to make the impulse sealing time longer. Since the impulse sealant is cooled by applying pressure, it is necessary to use a heating wire of less than 5mm diameter with a relatively small thermal capacity, especially when the heat sealing operation must be rapidly repeated.

3. The time it takes for the melting surface to reach a sufficient temperature. 4. The temperature at which thermal degradation occurs. These four factors are discussed in chapter 3 with schematic drawings. A rational and standardized method for heat sealing is discussed in Chapter 4, and later chapters present guidance on how to understand and apply new methods for monitoring and analyzing heat sealing. These include the following: 1. A technique to easily measure temperature at the melting surface in a range of approximately 20–30 micron thicknesses, at high speed and with high accuracy for heat sealing investigations.

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