Some products require a peel-away packaging option which disappears at the point of use. Water soluble film provides such a solution because selected grades of film are capable of dissolving when exposed to water.

While a low cost option may seem an attractive proposition, buyers must consider thickness, water temperature, product compatibility, seal strength and storage conditions. A film which proves effective for a detergent pod may prove totally ineffective for another chemical or industrial product.

Prior to committing to a purchase, buyers must consider both the advantages and limitations of this type of packaging solution.

Where Water-Soluble Film Excels – And When It Fails

Water soluble film is manufactured using a variety of polymers including polyvinyl alcohol (often referred to as PVA or PVOH) in different configurations which enables the film to be dissolved in water under a range of conditions.

One of the main attractions of this type of packaging is convenience because it can often be dispensed without being opened. This is especially useful for products which are measured in specific doses.

Main Benefits

Other potential benefits include:

• Pre-packaged dosing: The product can be dispensed in measured doses.
• Reduced exposure risk: Some products require more careful handling, particularly prior to use.
• Space saving: For some products, a thinner outer layer can dramatically reduce the amount of additional secondary packaging required.

Tailored dissolution rates: Varying the thickness and polymer composition of the film can create a range of dissolution rates applicable to a range of water temperatures.

Important Limitations

However, there are also significant limitations with this type of packaging, including:

The effects of moisture on film integrity during transportation and storage. Films which have been exposed to excessive humidity can often become compromised during storage.

Product compatibility. The packed product and any additional liquids or additives must also be compatible with the film.

For example, during the testing stage for a concentrated detergent, a buyer must not test the dissolution rate of an empty pack, but must examine a pack containing the actual detergent which is due to be packed.

What Buyers Should Ask When Researching Film Suppliers

A competent water soluble film manufacturer should be capable of explaining how their film functions and any limitations which may apply. Instead of asking generic questions, buyers should request specific technical information.

Check Dissolution Specifications

The starting point should always be dissolution specifications. What temperature of water will cause the film to dissolve? How does the thickness of the film impact dissolution?

Review Seal Strength and Product Compatibility

Buyers should also ask about seal integrity. Inadequate sealing during the filling, packing, shipping or storage process can often result in leakage of the packed product. Request sample rolls in the thickness and grade required. Buyers must also ask about product compatibility. A competent supplier will ask for detailed information about the product being packed, including whether it takes the form of a powder, tablets, liquid, or detergent.

Research Available Film Grades

In addition to asking technical questions, buyers can also research the range of products offered by the manufacturer online www.watersolubleplastics.com  to establish what grades and specifications may be applicable to their intended use.

Confirm Storage Requirements

Finally, buyers should also ask about storage conditions. What temperature and humidity levels are likely to damage the film? What packaging and storage conditions are likely to prolong the shelf life of the rolls? This will help to avoid buying damaged stock.

How To Ask The Right Questions Ahead Of Placing A Large Order

A buyers’ trial run can expose weaknesses which may not be apparent in specifications. Test the film under the same filling, sealing, storage and handling conditions proposed by the manufacturer.

Questions To Ask Before Ordering

Ask questions including:

• What thickness options are available?
• What water temperature is required to dissolve the film?
• Is the film compatible with the packed product?
• What storage conditions are recommended to prolong the shelf life of the product?
• Can sample rolls or test pieces be provided?
• What sealing method is recommended for this film?
• Can the size and specifications of the film be altered?

Avoid Choosing On Price Alone

Do not fall into the trap of choosing a supplier simply because they offer a lower price per square metre. The costs of production downtime caused by torn, leaking, adhesive packs or films which fail to dissolve at the specified time can far outweigh any potential savings on the purchase price.

A competent supplier will also offer technical support and realistic advice about the suitability of specific films for a particular application.

Key Takeaways

• Select the most appropriate film grade for the intended application and product.
• Test trial runs with filled packs before authorizing large-scale production.
• Consider the effects of humidity, storage, sealing methods, and dissolution testing when selecting a supplier.
• Ask for technical specifications rather than relying on generic advice.
• Compare overall value for money rather than simply focusing on price differences.

Making The Right Final Choice

The right water soluble film manufacturer will offer more than just a roll of film. Effective results are achieved by matching the correct material to the application, selecting the most appropriate thickness and seal method, and ensuring that the dissolution specifications match the end use. Test rolls should always be requested and tested under the same conditions as the production line to avoid production line downtime caused by faulty packs. A clear specification also facilitates comparisons between different suppliers.