Fresh foods, such as meat, vegetables, fruits, etc., have extremely high requirements on the barrier properties of packaging materials due to their perishability. If these foods cannot effectively prevent the penetration of oxygen and water vapor during storage and transportation, they will quickly oxidize and deteriorate, resulting in a decrease in food freshness, loss of nutritional value, and even the generation of harmful microorganisms, threatening food safety. Therefore, choosing a packaging material that can effectively isolate oxygen and water vapor while maintaining the original flavor and nutritional value of food is crucial to the preservation of fresh food.
Single-sided PVDC coated PET film, as a high-tech food packaging material, was born to meet the demand for fresh food preservation. It consists of two layers of materials: one is a PET (polyethylene terephthalate) base material, and the other is a PVDC (polyvinylidene chloride) coating. The PET substrate has good transparency, mechanical strength and heat resistance, while the PVDC coating is known for its excellent barrier properties.
PVDC is a resin material with extremely high barrier properties. The chlorine atoms in its molecular structure can form a tight barrier, effectively preventing the penetration of oxygen, water vapor and odor molecules. This characteristic makes single-sided PVDC-coated PET film perform well in fresh food preservation packaging. It can not only effectively extend the shelf life of food and reduce food loss during transportation and storage, but also maintain the original flavor and nutritional value of food and enhance consumers' eating experience.
Meat is an important part of fresh food, and its preservation requirements are particularly strict. The application of single-sided PVDC coated PET film in meat preservation packaging is mainly reflected in the following aspects:
Prevent oxidative deterioration: During the storage and transportation process of meat food, if it comes into contact with oxygen, oxidation reaction will occur, causing the meat to change color and deteriorate. The high barrier properties of single-sided PVDC-coated PET film can effectively prevent the penetration of oxygen, thereby slowing down the oxidation process of meat and maintaining the tenderness and color of the meat.
Retain moisture: The moisture content of meat products is critical to their taste and nutritional value. The single-sided PVDC-coated PET film can prevent water vapor from penetrating, maintain the moisture content of meat, prevent it from drying out due to water loss, and keep the meat tender, smooth and juicy.
Inhibit the growth of microorganisms: Fresh meat food is a breeding ground for microorganisms. The barrier properties of single-sided PVDC-coated PET film can effectively prevent microorganisms from entering the food through packaging materials, thus inhibiting the growth of microorganisms and extending the shelf life of food.
Vegetables are an important part of people's daily diet, and their preservation is equally important. The application of single-sided PVDC-coated PET film in vegetable fresh-keeping packaging is mainly reflected in the following aspects:
Prevent moisture loss: If vegetables cannot effectively retain moisture during storage and transportation, they will quickly dry up and lose their original taste and nutritional value. The single-sided PVDC-coated PET film can prevent water vapor from penetrating, maintain the moisture content of vegetables, prevent them from drying out due to water loss, and keep vegetables crisp and tender.
Inhibited respiration: During storage, vegetables will still respire, consuming oxygen and releasing carbon dioxide. The high barrier properties of single-sided PVDC-coated PET film can effectively control the concentration of oxygen and carbon dioxide inside the packaging, thereby slowing down the respiration of vegetables and extending their shelf life.
Prevent microbial contamination: Vegetables are susceptible to microbial contamination during picking, transportation and storage. The barrier properties of single-sided PVDC-coated PET film can effectively prevent microorganisms from entering the inside of vegetables through packaging materials, thereby inhibiting the growth of microorganisms and keeping vegetables clean and hygienic.
With the increasing global emphasis on environmental protection and sustainable development, the environmental performance of single-sided PVDC-coated PET films has also attracted much attention. Although PVDC materials may produce certain harmful gases when incinerated, modern production processes have reduced harmful gas emissions during combustion by adding modifiers and additives. At the same time, PVDC materials can also be recycled and reused, reducing environmental pollution. In addition, with the development of biodegradable material technology, more environmentally friendly single-sided PVDC-coated PET film alternatives are expected to be developed in the future to meet the market demand for environmentally friendly packaging materials.
