Does sealing film performance degrade after high-temperature retort?

Does sealing film performance degrade after high-temperature retort? This is a question asked by almost every customer making products that require high-temperature sterilization.

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Static electricity builds up during sealing film production — how do you deal with it?

Sometimes in the workshop, you might see this: the sealing film sticks to the guide rollers as it runs through the equipment, or the edges come out uneven during rewinding. Static electricity is often the culprit.

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Can sealing gaskets really not be reused?

You unscrew the cap, see the aluminum foil intact on the bottle mouth, and the paperboard sitting securely inside the cap — that's the standard state after electromagnetic induction sealing.

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Can sealing film be used on frozen foods?

Many customers in the frozen food industry have asked this question: if you put sealing film in a freezer, will it become brittle, crack, or fail to seal?

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Electromagnetic Induction Sealing vs. Heat Sealing

Electromagnetic induction sealing is non-contact. The principle is a bit technical, but here's a simple way to think about it: the machine generates a high-frequency electromagnetic field.

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How Does Sealing Film Help Preserve Freshness in the Upgrading of Prepared Food Packaging?

The prepared food industry is undergoing a packaging revolution. From simple plastic seals in the beginning to today's comprehensive requirements for "freshness preservation," "easy-peel," and "heat resistance," the role of sealing film has changed — it's no longer just about "covering the container," but a critical part of ensuring product quality.

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What's the Difference Between Food-Grade Sealing Film and Ordinary Sealing Film?

When you put these two films side by side, the difference isn't in price — it's in the standard line.

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Where Do Bubbles on Sealing Film Come From?

After sealing, you notice a few small bumps on the film surface. Not cracks, not peeling — just those little bubbles, not quite reassuring.

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Do Seal Liner Work for Both Wide-Mouth and Narrow-Mouth Bottles?

Clients often ask: "Can seal liner be used on wide-mouth bottles? Won't narrow-mouth bottles be too small to seal properly?" The answer is simple: both work, but the selection logic is different. Bottle size determines how to choose the liner, which material to use, and what sealing effect to achieve. Leadtra Packaging breaks it down for you.

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What Is the Shelf Life of Sealing Film and How Should It Be Stored?

Does sealing film have a shelf life? If you buy a batch of film and leave it for a while, can you still use it? This is a question many customers ask.

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Can Sealing Film Be Customized for Irregular Bottle Mouths?

Square, oval, rectangular — as packaging design increasingly pursues differentiation, irregular bottle mouths are no longer a rarity.

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How to Determine If a Sealing Film Is Right for Your Product?

So how do you determine if a sealing film is truly suitable for your product? Based on years of experience, Leadtra Packaging has outlined several key evaluation dimensions.

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How Is the Barrier Property of Sealing Film Measured?

Leadtra Packaging provides an overview of testing methods and industry standards to help you understand how sealing film builds an effective protective barrier for your products.

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How to Choose Between Foam Gaskets and Aluminum Foil Gaskets?

Many customers ask during selection: What's the difference between foam gaskets and aluminum foil gaskets? Which one is right for my product?

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New Requirements for Sealing Film in E-Commerce Logistics:

The unique challenge of e-commerce logistics is that packages go through sorting, tossing, stacking, long-distance transport, and many other handling steps. The level of "abuse" packages endure far exceeds that of traditional brick-and-mortar channels.

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2026 Sealing Film Industry Trends: Easy-Tear, Eco-Friendly, and Smart Take Center Stage

In 2026, the sealing film industry is undergoing a transformation from "functional fulfillment" to "experience enhancement." In the past, the core demand for sealing film was simple: it just needed to seal well.

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How to distinguish aluminum foil sealing film is aluminum foil or VMPET

Usually when we communicate with customers, customers can't distinguish between aluminum foil and what is VMPET. In fact, in our professional field, there is a simple way to distinguish, that is, we pick up the aluminum foil or VMPET, and illuminate under the light. If it can transmit light, it belongs to VMPET. If it can't transmit light, it is aluminum foil.

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Advantages of die-cut aluminum foil lids

The advantage of die-cut aluminum foil lids is that the product can be die-cut according to the printing pattern, the edges are neat, and it can be die-cut according to customer's requirements. Our company die-cut aluminum foil sealing film adopts video positioning and tracking, and the precision rate reaches 0.005mm, which guarantees the beauty of the product and the requirements for use.

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Common structure of aluminum foil sealing film

The common structure of aluminum foil sealing film is: PET / printing / aluminum foil / sealing layer The above is a common structure, we can change the material thickness or material according to the requirements of the customer, which can meet different customer requirements.

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The difference between the use of electromagnetic induction seal liner and aluminum foil sealing film

The electromagnetic induction seal liner is an electromagnetic induction machine that resonates with aluminum foil by ultrasonic waves and then generates heat to seal. The aluminum foil sealing film is sealed by a hot press sealing machine by direct heating at a temperature and with a certain pressure and time. Two different products, but all can achieve the sealing effect.

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