The safety of plastic product processing in household appliances is crucial, involving many aspects of testing. Only after strict and comprehensive testing can it be ensured that it will not cause harm to users during use.
Material safety testing is the first step. Plastic product processing may contain harmful substances. During the use of household appliances, these substances may migrate to items in contact with the human body or be released into the environment. Therefore, it is necessary to screen the raw materials of plastic product processing to see if they contain excessive heavy metals, plasticizers, formaldehyde, etc. For example, plastics used to make food contact household appliance parts must ensure that no substances harmful to health are released under normal use and simulated extreme use scenarios.
Mechanical property testing is also an important content. The mechanical properties of plastic product processing are related to the durability and safety of household appliance parts. It is necessary to test its tensile strength to determine whether it is easy to deform or break under stress. For parts such as fan blades, if the tensile strength is insufficient, there may be a risk of blades falling off during operation. It is also necessary to test the impact toughness to ensure that plastic product processing will not break easily when hit by external forces. For example, the outer shell of a refrigerator will inevitably be hit during daily use. Good impact toughness can ensure its structural integrity.
Thermal performance testing is also indispensable for plastic products processing of household appliances. Since the internal components of household appliances will generate heat during operation, or some household appliances themselves need to work in a high temperature environment, this requires plastic products processing to have good heat resistance. During the test, it is necessary to check whether plastic products processing will deform or melt in a high temperature environment. For example, the plastic parts inside the oven must be able to withstand high temperatures without changing their shape and performance. At the same time, for household appliances used in low temperature environments, such as refrigerators, the low temperature resistance of plastic products processing must also be tested to ensure that it will not become brittle or crack at low temperatures.
Flame retardant performance testing is a key link in ensuring the safety of household appliances. If a fire occurs due to a fault in the internal circuit of a household appliance, plastic products processing with flame retardant properties can effectively prevent the spread of the fire. During the test, an open flame environment will be simulated to observe the burning speed, self-extinguishing ability and burning dripping of plastic products processing. For example, the plastics used in parts such as TV housings and air conditioner electric control boxes need to have a certain flame retardant grade to prevent plastics from becoming combustion aids when a fire occurs.
Electrical insulation performance testing is very necessary for plastic products processing involving live parts. These plastic products processing need to play the role of isolating current to prevent users from getting electric shock. During the test, high voltage will be applied to both ends of the plastic products processing to check whether breakdown or flashover will occur. The volume resistivity and surface resistivity will also be measured to ensure that the plastic products processing can still be effectively insulated even in humid and dusty environments. For example, the plastics of switch panels, socket shells and other components must have reliable electrical insulation performance.
Environmental adaptability testing can ensure that plastic products processing maintains stable performance in various usage environments of household appliances. It is necessary to test the tolerance of plastic products processing to common household chemicals to see whether it will swell, change color or decrease in strength after contact with detergents, cooking oils and other substances. At the same time, it is also necessary to simulate sunlight and other environments to test the weather resistance of plastic products processing to prevent yellowing and cracking due to light during long-term use. For household appliances used in humid environments, the water resistance and steam resistance of plastic products processing must also be tested.
After completing the above individual tests, comprehensive testing is also required. When assembling plastic products processing into household appliances, check its compatibility with other components and detect whether stress concentration will cause cracking of plastic products processing during assembly. And from the user's perspective, check whether the edges and corners of plastic products processing will scratch the human body and whether the surface feels comfortable. Only through comprehensive and strict testing can the safety of plastic products processing in household appliances be guaranteed and reliable products be provided to users.
