FAQ

For a chamberless packaging machine, also known as a slat vacuum sealer, you should use moleskin bags for vacuum packaging, that is, bags with a structured surface that allows efficient air extraction.

Vacuum chamberless packers remove air from the inside of the bag to the outside of the machine, so the structure of the moletting creates air channels that facilitate the proper process and ensure tight sealing. In this case, smooth bags do not provide proper air extraction.

When choosing bags for a vacuum sealer, pay attention to:

1. compatibility with device type (chamberless vs chambered),
2. format matched to product,
3. thickness and strength of material,
4. approval for food contact (if food is packaged).

Vacuum bags designed for chamberless packaging machines are often referred to as molded bags for slat packers or bags for chamberless vacuum packaging.

The choice between moleskin and plain bags depends primarily on the type of vacuum packer.

Moleskin (structured) bags are designed for chamberless (strip) packers, as their embossed surface allows for efficient extraction of air from inside the package. These are the most commonly used bags for vacuum packaging in home and smaller professional applications.

Smooth bags are used in chamber packers, where the entire package is placed in the chamber of the machine, and air is removed from the entire working space at once. In such a system, the molecular structure is not required.

Therefore, before buying vacuum bags, it is worth checking the type of device - for a chamberless packer, the molecular bags will be suitable, while for a chamber packer, smooth bags are intended.

When sizing vacuum bags for a particular product, it is a good idea to be guided by the dimensions of the item when packed - both the width and the length when folded or placed in the bag. The bags should be sized so that the product fits freely, with about 1-2 cm allowance for the seal on both sides of the opening.

In practice, typical sizes of commercially available mothballed bags are, for example:

1. 15 x 20 cm - practical for small products, e.g. pieces of cheese or small portions of food
2. 15 x 25 cm - versatile bags for smaller portions and home use
3. 20 x 30 cm - a good choice for medium-sized products such as portions of meat or fish
4. 20 x 40 cm - useful for longer products or larger portions
5. 25 x 35 cm - wide size for packing larger pieces or sets of products

When choosing bags for vacuum packing food, always leave 1-2 cm free on each side so that the packer can properly extract the air and make a tight seal.

Matching the right size bag to the product directly affects the effectiveness of vacuum packaging and the quality of the package seal.

Choosing the right thickness of vacuum bags is crucial for the package's durability, seal quality and resistance to mechanical damage during packaging, storage and transportation.

What does the thickness of vacuum bags mean?

Thickness of vacuum packaging bags is usually specified in microns (µm). The higher the number of microns, the stronger the film and the greater the resistance to puncturing, tearing or micro-damage, especially when dealing with sharp, hard or irregular-surfaced products (e.g., meat on the bone, ripened cheeses, liquid products).

Vacuum bags with a thickness of 50-70 µm are suitable for packaging soft and delicate products such as boneless poultry meat, vegetable and fruit portions, baked goods, loose products.

This thickness provides a sufficient seal for standard vacuum packaging and refrigerated storage or short-term freezing.

Vacuum packaging bags with a thickness of 80-90 µm work well for more compact or moist products, such as red meat portions, fish, cheese, frozen foods, larger irregularly shaped food pieces.

Increased film thickness improves puncture resistance and seal stability, reducing the risk of package leaks.

Vacuum bags with a thickness of 100 µm and above are recommended for packaging products with a higher risk of package damage, such as bone-in meat, hard-ripened cheeses, products with sharp edges, foods intended for long-term freezing or transportation.

Thicker PA/PE film provides greater mechanical resistance, higher package durability and better stability during storage.

The harder, heavier or more demanding the product, the greater the thickness of vacuum bags should be selected. Properly selected vacuum packaging bags directly affect the tightness of the package, food safety and storage life.

Vacuum bags of greater thickness provide higher mechanical resistance and better seal stability, which translates into a lower risk of package leakage.

Yes, mothballed vacuum packaging bags can be used as sous-vide bags, provided that the material (e.g., PA/PE film) is approved for food contact and suitable for use within certain temperature ranges.

Vacuum bags for sous-vide should be used in accordance with the manufacturer's technical documentation and process parameters - in particular, temperature and processing time. Properly selected bags for vacuum packaging of food ensure the tightness of the package and the stability of the cooking process at low temperature.

Before using for sous-vide, make sure that the type of bag is designed for thermal processing and meets the requirements of food contact materials (FCM).

Yes - vacuum bags made of multilayer PA/PE film are suitable for freezing, provided they are designed for food contact and used in accordance with the parameters of the material.

Vacuum packing before freezing limits the access of air to the product, which reduces the risk of drying, frost formation and the so-called "frost burn". Thanks to this, food stored in vacuum packaging bags retains a better structure, taste and quality after thawing.

When freezing, it is worth paying attention to the appropriate thickness of vacuum bags, the correct seal to ensure the tightness of the package and also the compatibility with the vacuum packer (moleskin for chamberless, smooth for chambered).

Compatible vacuum bags for freezing ensure package stability even at low temperatures and reduce the risk of unsealing during storage.

Yes - Evavac vacuum bags made of PA/PE film approved for food contact can be used as food vacuum packaging bags, as long as they are used in accordance with the manufacturer's instructions and the material's intended use.

The PA/PE film used in Evavac bags has been subjected to migration testing in accordance with the requirements for Food Contact Materials (FCM), and the results obtained are within the acceptable limits for migration of substances. The material documentation and declaration of conformity confirm that the bags can be safely used for packaging meat, fish, cheese and other food products.

Before using food contact vacuum bags, it is always a good idea to make sure that the size and type of bag is suitable for a specific application (e.g., for freezing or sous-vide processing) and that the seal is properly made.

Yes - Evavac vacuum bagsmade of PA/PE film approved for food contact have declaration of conformitycompliant with the requirements for food contact materials (FCM).

Materials used in the production of vacuum packaging bags have been subjected to migration tests that evaluate the potential penetration of substances from the film into food under specific test conditions. The results are within the acceptable limits set for FCM materials, confirming that the bags can be used for packaging meat, fish, cheese and other food products.

The Declaration of Conformity is part of the material documentation that the manufacturer can make available to professional users for inclusion of vacuum bags in quality systems, such as HACCP, and for submission in audits and risk assessments.

Molecular vacuum packaging bags can be purchased at specialty stores for vacuum packaging and supplies, online stores for food service and professional packaging accessories, as well as in marketplaces under the keywords molecular bags, vacuum packaging bags or bags for chamberless packers.

Before buying, it is worth searching under keywords such as sealer film, moleskin bags for vacuum packing, bags for chamberless vacuum packing machine, foil for sealers, PEand check in the description whether the film is approved for food contact.

Evavac sealer bags made of PA/PE film are designed for food contact and can be used as vacuum packaging bags for meat, fish, cheese and other food products requiring limited air access. The packaging material is designed in accordance with the requirements for food contact materials (FCM).