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Application and unique advantages of light blocking HIPS sheet in dairy product packaging

light blocking HIPS sheet

What is light blocking HIPS sheet?

Light blocking HIPS (High Impact Polystyrene) is a plastic sheet with high strength and excellent impact resistance, and is specially formulated to have good light-blocking properties. Compared with ordinary transparent or translucent plastics, light-blocking HIPS sheet can effectively block light, especially ultraviolet rays (UV), thereby protecting the internal packaging from light and extending the shelf life of food.

For dairy product packaging, light will accelerate the oxidative decomposition of dairy products, resulting in a decrease in taste, loss of nutrients, and even deterioration. Therefore, it is crucial to choose packaging materials with high light-blocking properties. HIPS sheets have shown unique advantages in this field and have become an ideal choice for dairy product packaging such as cheese sticks, yogurt cups, milk bottle caps, and cream boxes.

Main features of light-blocking HIPS sheets

✅ Excellent light-blocking properties: Block ultraviolet and visible light to prevent the degradation of fat and nutrients in dairy products.
✅ High impact strength: can effectively protect food from physical damage during transportation and storage.
✅ Good thermoforming performance: suitable for thermoforming packaging of various shapes, such as cheese stick packaging, yogurt cups, etc.
✅ Food grade safety: HIPS meets food contact safety standards and can be directly used for dairy product packaging.
✅ Customizable colors: usually white or black and white composite structure is adopted to achieve the best light-blocking effect.
✅ Adapt to a variety of sealing methods: suitable for heat sealing and cold sealing to ensure the sealing of the packaging and prevent the product from being damp or contaminated.

light blocking HIPS sheet

The uniqueness of light-blocking HIPS sheet in dairy product packaging

1️⃣ Extend the shelf life and maintain the nutrition of dairy products
Dairy products are rich in fat, protein, vitamin A and D, which are easily decomposed or oxidized under light. For example, ultraviolet rays can cause vitamin B2 (riboflavin) in dairy products to decompose, causing milk to deteriorate and produce odors. Light-shielding HIPS sheets can effectively block more than 99% of ultraviolet rays, significantly slowing down the degradation of nutrients and increasing the shelf life of dairy products.

light blocking HIPS sheet
light blocking HIPS sheet

2️⃣ Prevent changes in flavor and taste
Light not only affects the nutritional content of dairy products, but also changes their flavor and taste. For example, cheese is easily oxidized under light, producing a bitter or rancid taste (odor caused by fat oxidation). The light-shielding properties of HIPS sheets prevent this problem and ensure that consumers can enjoy fresh and delicious dairy products.

3️⃣ Suitable for a variety of dairy product packaging forms
Light-shielding HIPS sheets are widely used in various dairy product packaging, including but not limited to:

Cheese stick packaging: ensure that cheese sticks will not deteriorate due to light on supermarket shelves.

Yogurt cups, cream boxes: use HIPS cup body + aluminum foil sealing to provide double protection.

Milk bottle caps, cream sealing caps: Bottle caps made of HIPS sheets can reduce the contact of milk with light and further extend the shelf life.

light blocking HIPS sheet
light blocking HIPS sheet

4️⃣ Environmental sustainability
Some HIPS sheets can be added with recyclable materials or adopt bio-based formulas to reduce the impact on the environment. Compared with PVC or PETG, HIPS sheets have lower energy consumption in production and are easy to recycle, making them a packaging option that is in line with the trend of sustainable development.

Manufacturing process of light blocking HIPS sheets

The production process of light-shielding HIPS sheets mainly includes raw material formula adjustment, co-extrusion molding, surface treatment, roll cutting and other steps.

High light-shielding properties are usually achieved by adding titanium dioxide (TiO₂) or carbon black.

Surface treatment can be scratch-resistant coating, matte treatment, etc. according to customer needs to enhance the appearance and feel of the product.

Co-extrusion technology can be used to produce black and white composite sheets to further enhance light-shielding performance.

FAQ

Is light-shielding HIPS sheet more expensive than ordinary HIPS sheet?

Yes, the cost is slightly higher, but its superior protective performance can reduce food spoilage and loss, which is more cost-effective in the long run.

Can the light-blocking HIPS sheet be in direct contact with food?

Yes, it complies with FDA and EU food contact safety standards and is suitable for food packaging such as dairy products, yogurt, cheese, etc.

Can the color of the light-blocking HIPS sheet be customized?

Yes, common colors include white, black, black and white double layers, etc. The light-shielding level and appearance can be adjusted according to customer needs.

Can the light-blocking HIPS sheet be used for refrigerated or frozen food?

Yes, HIPS has good low-temperature tolerance and can be used for refrigerated dairy product packaging below 0℃, but it is not suitable for extreme freezing (such as -40℃).