At present, the packaging industry is the most widely used industry for plastic products, including various packaging films such as cling films, printing substrate films, heat shrink films, barrier films, as well as various packaging containers such as yogurt bottles and food cans. Due to the direct impact of food on consumer health, there are also high requirements for packaging materials. In addition to basic characteristics such as breathability, moisture resistance, oil resistance, puncture resistance, and high transparency, high barrier properties are also required for volatile substances (such as the aroma of food), oil resistance on the inner layer, convenient printing on the outer layer, and high heat sealing strength.
According to the production process of plastic products, plastic machinery can be divided into four categories: plastic mixing machinery, plastic forming machinery, plastic secondary processing machinery, and plastic processing auxiliary machinery or devices. Plastic mixing machinery is used for the manufacturing of various forms of plastic mixing materials, including kneading machines, plasticizers (open and internal mixers), pelletizers, screening machines, crushers, and grinders. Plastic molding machinery, also known as plastic one-time processing machinery, is used for the molding of plastic semi-finished products or products, including compression molding machines, injection molding machines, extrusion machines, blow molding machines, rolling machines, foaming machines, etc. Plastic secondary processing machinery is used for the reprocessing and post-processing of plastic semi-finished products or products, including hot forming machines, welding machines, heat sealing machines, hot stamping machines, vacuum evaporation machines, flocking machines, printing machines, etc. Metal processing machines are also commonly used for plastic secondary processing. Plastic processing auxiliary machinery or devices are used to rationalize the plastic processing process, including automatic measuring and feeding devices, automatic recovery devices for leftover materials, automatic extraction devices for injection molded products, rapid replacement devices for injection molded parts, cooling machines for injection molded parts, automatic thickness measurement devices, and raw material transportation and storage equipment. This type of auxiliary machinery or device has become an indispensable part of modern plastic processing automation.
Briefly describe the application of plastic machinery in the packaging industry
2023 11/06