## 1 Introduction  
The prevalence of COVID-19 has severely impacted economic activities and common people's lives worldwide [1]. The anti-epidemic measures have made many restaurants use portable food packages. When the epidemic situation became severe in 2021, many restaurants or shops stopped their dine-in services for epidemic control. Some stores went further to provide takeaway in disposable food packaging containers only. They refused to put food in the environmentally friendly containers of the customers. The epidemic prevention and environmental protection issues fall into a dilemma [2]. Most food packaging containers in the world are plastic and composite paper packaging materials. The annual consumption of different kinds of beverage paper cups in Taiwan is estimated at more than 2 billion pieces. According to the investigation of Green-peace International in 2021 [3], it is hard to estimate the quantity increase during the COVID-19 pandemic. The issue of plastic reduction has been the trend and consensus of environmental protection globally [4]. In 2019, the European Union appealed to reduce the use of single-use plastics (SUP). They proposed the single-use plastics-related policy (EU) 2019/904 and SUP instruction. The EU required the member states to prohibit using some single-use plastics products since July 2021, which were generally regarded as the most familiar marine garbage [5], mostly dinnerware and beverage packing containers. To reduce pollution in the transition period, scientific methods are required to control the source, increase manufacturing efficiency, improve quality, and reduce the weight of products. There are many environmentally friendly materials for substituting plastic raw materials, especially the alternative products of biomass material [6] or degradable plastics [7]. However, there are problems in sanitary preservation and the pollutant plastic recycling system to be overcome, for example, using the biomass material polylactic acid (PLA) [8] to replace some plastic packaging materials for food. The replacement of material is not a radical solution. It can be confused with the existing plastics recycling system in Europe, e.g., polyethylene terephthalate (PET), resulting in more pollution and losses. This study suggested that environmentally friendly disposable food packaging containers should be a simple material, recyclable, or biodegradable. In compliance with the global trend of plastic reduction [9], the UK government collects a plastic packaging tax. It implements the deposit return scheme (DRS), which directly collects petty environmental protection deposits from beverage manufacturers while encouraging them to be involved in recycling. As the name suggests, extended producer responsibility (EPR) extends the producers' responsibility [10], meaning that relevant manufacturing enterprises bear all expenses related to recycling and processing packages. To ensure the recycling of more plastic products is a scientific and feasible method, [PERSON], a French chemist, proposed the \"law of conservation of matter\" in 1787 [11]. He stated that industrial products consume energy, and the environment will be inevitably polluted. The merits and demerits should be discussed using scientific and objective methods. How to reduce the resource consumption and pollution resulting from developing and manufacturing plastic packaging containers is the actual aspect conforming to the \"plastic reduction\" reality. This study discusses assisting enterprises to develop more conveniently recyclable and environmentally friendly plastic products, enhancing key technologies and manufacturing machines and molds for high-efficiency bulk production, meeting the demand for market competition cost and finding quality improvement methods. The current recyclable materials development focus in Europe is mainly on polypropylene (PP) [12]. It is characterized by a higher impact resistance, robust mechanical properties, resistance to multiple organic solvents, and resistance to acid/alkaline corrosion.