FAQs on Corona-treated Corrugated Plastic Sheets

1,What is the biggest difference between corona-treated corrugated plastic sheets and regular corrugated plastic sheets?

The main difference lies in the surface treatment: regular corrugated plastic sheets have a smooth surface, making it difficult for ink to adhere. In contrast, corona-treated corrugated plastic sheets undergo a high-voltage electrical treatment that enhances the surface energy, allowing ink, coatings, and other functional processes (like film lamination) to bond better. However, the core characteristics of light weight and compression resistance remain the same for both.

2,Does corona treatment affect the hardness or flexibility of the corrugated plastic sheet?

No, it does not. Corona treatment only affects the top 0.1-1μm layer of the surface, altering its properties without impacting the core material's hardness, flexibility, or compression resistance. The original features, such as load-bearing and impact resistance, remain intact.

3,What material is corona-treated corrugated plastic made from?

The mainstream material used is polypropylene (PP), an environmentally friendly plastic that is 100% recyclable and meets common environmental standards.

4,Can corona-treated corrugated plastic be used outdoors? Will it fade or get damaged by rain or sun exposure?

Yes, it can be used outdoors. The PP material can withstand high and low temperatures (-40°C to 60°C), and the corona-treated surface adds an oxidation layer, improving UV resistance and rainwater durability. Outdoor signage and labels can last for 2-3 years without significant fading or brittleness.

5,Will the ink on a corona-treated corrugated plastic sheet fade or come off, especially in damp environments or during wiping?

No, the ink is not easily removed. Corona treatment creates microscopic pores on the surface that allow the ink to "embed" into the material, creating a stronger bond with the surface's polar groups. In humid environments or during normal cleaning (such as wiping price tags in fresh food sections), the ink generally remains intact unless a hard scraper is used with force.

6,Is it safe for food contact, such as for turnover boxes used to store fruits or fresh produce?

Yes, as long as you choose "food-grade" materials. These boards are made from PP material that complies with FDA or SGS food-contact certifications. The corona treatment does not involve any chemical agents, making them safe for food storage, washable, and resistant to mold.

7,How can I assess the quality of the surface treatment when buying corona-treated corrugated plastic sheets?

A simple test is using a "Dyne pen" to measure surface tension. Choose a 38-40 Dyne pen and draw on the surface. If the trace is evenly left behind and does not shrink, it indicates that the surface tension is sufficient (above 52mN/m). Alternatively, you can request a testing report from the manufacturer to check the specific Dyne value.

8,Can I customize the thickness and size of corona-treated corrugated plastic sheets? How long does it usually take to deliver?

Yes, customization is available. Common thicknesses range from 2mm to 12mm, and sizes can be cut according to needs (e.g., 1.2m × 2.4m for advertising boards, 50cm × 30cm for turnover boxes). Small batch orders (a few hundred pieces) usually take 3-5 days, while large batch orders (a few thousand pieces) take 7-10 days, depending on the manufacturer's production capacity.

9,What should I pay attention to when choosing a manufacturer, such as qualifications or equipment?

It's recommended to prioritize manufacturers with ISO9001 certification, ensuring stable quality. Also, check the power of their corona equipment-equipment with 4KW or higher ensures more even treatment. For special features (like flame retardant or food-grade properties), request relevant certification reports (e.g., fire safety tests, FDA certification).

10,Can corona-treated corrugated plastic be flame-retardant? What happens if it catches fire?

Yes, flame-retardant versions are available. When a flame retardant additive is added, the material will self-extinguish when the fire source is removed (it will not continue burning). It complies with fire safety standards, making it suitable for environments that require fire resistance, such as server rooms or laboratories.