Application Case of PP/EVOH Barrier Sheet in Thermoforming Packaging of Cheese Sticks

Introduction

PP/EVOH barrier sheet has been widely used in the field of food packaging due to its excellent barrier properties and processing performance. Among them, in the thermoforming packaging of cheese sticks, PP/EVOH sheet shows unique advantages. This article will elaborate on the specific application of PP/EVOH sheet in cheese stick packaging and analyze the benefits it brings.

Characteristics of PP/EVOH Barrier Sheet

PP/EVOH barrier sheet is a multi-layer co-extruded film composed of polypropylene (PP), ethylene-vinyl alcohol copolymer (EVOH) and polyethylene (PE).

PP layer: Provides structural strength, good heat resistance, and easy thermoforming.
EVOH layer: Has extremely strong polarity and has excellent barrier properties to oxygen, water vapor, aromatic substances, etc.
PE layer: Improves the surface smoothness of the sheet and enhances its wear resistance.

Advantages of PP/EVOH sheets in cheese stick packaging

• Extend shelf life: The EVOH layer can effectively block oxygen, water vapor and odor, prevent cheese from oxidation and deterioration, dehydration and shrinkage, thereby extending the shelf life of cheese sticks.
• Maintain flavor: The EVOH layer can effectively block the diffusion of aromatic substances in cheese, while preventing the invasion of external odors, thereby maintaining the original flavor of cheese sticks.
• Prevent grease migration: PP/EVOH sheets have good oil resistance, which can effectively prevent the grease in cheese from migrating outward and avoid packaging pollution.
• Improve product image: PP/EVOH sheets have good transparency, which can clearly show the appearance of cheese sticks and increase the attractiveness of products.
• Meet food safety standards: PP/EVOH sheets meet food grade standards, are non-toxic and harmless, and can directly contact food.

Application process of PP/EVOH sheets in thermoforming packaging of cheese sticks

Sheet selection: According to the specifications of cheese sticks and the requirements for barrier properties, select the appropriate PP/EVOH sheet thickness and structure.

Thermoforming: After the PP/EVOH sheet is heated and softened, it is formed by vacuum adsorption to produce a packaging container that matches the shape of the cheese stick.

Filling: Fill the cheese stick into the packaging container and seal it.

Case Analysis

A well-known dairy company uses PP/EVOH barrier sheet to thermoform cheese sticks. By using PP/EVOH sheet, the cheese sticks produced by the company have a 30% longer shelf life and better flavor, which is deeply loved by consumers. At the same time, due to the excellent performance of PP/EVOH sheet, the company also reduces the waste of packaging materials and reduces production costs.

Conclusion

PP/EVOH barrier sheet has broad application prospects in thermoforming packaging of cheese sticks. Its excellent barrier properties, processing properties and food safety make it an ideal choice for cheese stick packaging. By using PP/EVOH sheet, the shelf life of cheese sticks can be effectively extended, its original flavor can be maintained, product quality can be improved, and consumers’ demand for high-quality food can be met.