How Is Airtightness Achieved in Plastic Jar Lids?

The Role of PP and PC Caps in Food Safety

When it comes to food packaging, plastic lids are often underestimated. However, the right lid plays a crucial role in preserving product freshness, preventing contamination, and extending shelf life. So, how is airtightness ensured in PP and PC plastic jar lids? Let’s explore the details.

Why Airtightness Matters

Airtight plastic caps help:

• Prevent air and moisture from entering
• Preserve taste, texture, and nutritional value
• Extend the product’s shelf life
• Improve food safety and hygiene
• Enhance consumer trust

Especially in products like jam, pickles, sauces, olives, and spreads, the quality of the lid directly affects product integrity.

How Nurpet Ensures Airtightness in Plastic Lids

1. Integrated Sealing Ribs & Inner Design
   Our lids are designed with precise sealing ribs and optional liner systems that ensure a tight closure when paired with the correct container. This structure prevents leaks and air ingress, even during transportation.
2. High-Precision Injection Molding
   At Nurpet, we manufacture lids using advanced injection molding techniques. This allows us to achieve flawless dimensional accuracy, resulting in perfect fitting and consistent sealing.
3. Food-Grade Materials
   We use BPA-free, food-contact-safe PP (polypropylene) and PC (polycarbonate) materials. Our caps are heat-resistant, odor-free, and compliant with international hygiene standards.

Wide Size Range: 28 mm to 120 mm

Nurpet produces plastic caps in a variety of sizes, ranging from 28 mm to 120 mm, to suit a wide range of container types and food categories, including:

• Jars for jam, honey, sauces
• Buckets and large containers for pickles or bulk food
• Bottles for oils, syrups, or vinegar

Why Choose Nurpet?

Nurpet is a trusted manufacturer of durable, safe, and customizable plastic caps for the food packaging industry. Our lids combine:

• Airtight performance
• Food safety
• Aesthetic versatility
• Strong sealing capability

to protect your products and your brand reputation.

Explore our full range of plastic caps and get in touch for custom solutions tailored to your production needs.