Appearance quality: The appearance of aluminum-plastic composite covers should be clean, smooth, and free of obvious defects, dents, or scratches. The plastic layer and aluminum foil layer should be tightly bonded without delamination or peeling.
Dimensional accuracy: The dimensional accuracy of aluminum-plastic composite covers should comply with relevant regulations, including inner diameter, outer diameter, height, etc., and the tolerance should be within the specified range.
Physical properties: Aluminum plastic composite covers should have certain physical properties, such as tensile strength, tear strength, heat sealing strength, etc. These properties should meet the requirements of relevant standards to ensure that the aluminum-plastic composite cover is not easily damaged during use.
Chemical properties: The plastic layer and aluminum foil layer of the aluminum-plastic composite cover should comply with relevant standards and must not contain harmful substances such as organic volatiles and heavy metal elements that are harmful to human health. At the same time, the aging performance of the plastic layer should also meet the requirements to ensure the safety of the aluminum-plastic composite cover during use.
Compatibility: Aluminum plastic composite caps should be able to match well with other supporting components, such as bottle caps, bottle bodies, etc. There should be no excessive gaps or looseness to ensure the sealing and integrity of the product.
Heat resistance: Aluminum plastic composite covers should have certain heat resistance and be able to maintain their physical properties and appearance quality at a certain temperature. No deformation, discoloration, softening or other phenomena are allowed.
Sealing performance: The aluminum-plastic composite cover should have good sealing performance to prevent leakage of the contents. Under normal storage and use conditions, the contents should not leak or contaminate.
Reliability: Under specified conditions, aluminum-plastic composite covers should be able to withstand certain pressures, vibrations, impacts, etc. without damage or performance degradation. Reliability is an important indicator to ensure that aluminum-plastic composite covers maintain good performance during transportation, storage, and use.