Induction Sealing Machines Archives

Glass Liners for Sealing Glass Jars

Glass Liners in The Demand for Glass Jar Packaging

The appeal to use glass packaging is now more prevalent than ever. More and more people have become environmentally inclined to cope with consumerist practices, and subsequent manufacturing protocols, have followed suit. And when it comes to packaging in glass, one of the biggest hurdles for manufacturers is glass liners.

For many environmentally-conscious individuals, the appeal of glass-packed products is partly due to the wanting that said product not be tainted by plastic contact. Consumers are looking for purity in products and most likely align themselves with the goals of environmental awareness and sustainability. A big plus is that glass packaging is easily recycled and upcycled. If packaging can be repurposed or go on to serve a purpose well beyond a single use, then that is ideal.

With the widening usage of this type of packaging, improvement of glass liner technology is an inevitable need that must be met.

Traditional Glass Sealing

The uses of glass liners are three-fold:

A barrier for outside elements upon opening of the product
A form of tamper evidence
A seal to prevent leaking

Classically, almost all glass packaging had a neck with a thread to allow for the placement of a cap. More often than not, this cap was made of metal, thereby eliminating the prospect of using induction sealing for these products.

The induction sealing process usually works with a cap holding the induction sealing liner. This cap is then passed under a high-frequency oscillating magnetic field to adhere the components to one another. This process, however, does not work with metal caps as the metal interferes with the magnetic field.

In order to achieve the necessary uses of the glass liner, traditionally-used technology included heat shrink bands and tamper-evident labels. These two brought their own sets of challenges.

Heat shrink bands are difficult to apply in production and are even more difficult to remove once in the hands of the consumer. They have also been known to “collect” dust from the surroundings, making them less than appealing for end users. They even have the added disadvantage for the modern environmentally-conscious consumer: they are made of plastic. Ironically, when purchasing this glass-packaged product, the consumer will first have to remove the heat shrink band before they can even have access to the product.

Tamper-evident labels, on the other hand, are applied to the lid and serve as proof of any tampering with the product. They are used in the food and pharmaceutical industries for the benefit and safety of consumers.

Tamper-evident labels, along with heat shrink bands, are added on and do not serve the purpose of preventing leaks on their own. As such, it was very difficult for manufacturers to incorporate them with glass liners in order to achieve all three goals of liners. This lack of leak-proofing generally limited the use of glass packaging to dry powders and goods. Connected to this was the difficulty that liquids, especially oils, added to the equation. Previously, many liners would deteriorate with prolonged contact with the products. Their rims would gradually lift off of the glass container’s mouth, leading to issues with the integrity of the liners and the loss of trust of the consumers in the safety of the product.

New Technology in Glass Liners

With the advancement of technology, there is now newfound flexibility in glass jar seals. The improvement comes in time with the increased reliance on glass packaging, allowing said consumers to keep their values when they purchase products sealed with the now more reliable glass liners.

This new technology in glass liners now allows manufacturers to cater to a wider variety of products to package in glass: anything from coffee that needs its freshness maintained, to gel capsules that need tamper evidence, all the way to vegetable oils which proved hard to seal in the containers of the past.

Benefel Pty Ltd and Adeneli Packaging

Our teams at Benefel Pty Ltd. and Adeneli Packaging can help you with your glass liner needs. Our experts are on standby to take your calls and chats. Whatever product you may have, we have the perfect liner material for you. Product consultation is free and we are happy to develop partnerships with our customers by supplying consumable products that work well with packaging machinery.

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Glass Jar Seal and Glass Induction Sealing with SealerOn™

Traditional glass jar seal techniques no longer cut it when it comes to the average consumer’s needs. More and more people value a product’s longevity through the provision of reliable oxygen and moisture barrier. Along with this is the necessity for tamper evidence, particularly for products such as food and pharmaceuticals. And for the benefit of everyone involved in the process of product procurement, all the way to consumption of the said product, a leak-proof approach is more than necessary.

In the past, glass jar seals were often quite unreliable. Consumers faced the dilemma of sub-par seals or foil seals that made it too difficult to get to the product itself. For the part of the manufacturer, the process of adhesion of the seals onto the glass containers was very daunting and more often than not, ended up with inadequate results. Manufacturers were forced to rely on heat shrink bands to achieve a seal that kept the product within the container but these bands were too finicky for consumers to remove. These issues have now been remedied, thanks to glass jar sealing technology.

Many consumers prefer to purchase products in glass jars. They often do so with the thought that glass is more premium packaging over plastics as the glass is viewed to preserve the “purity” of the product. They also rely on this packaging to be of more environmental benefit and can easily be separated for recycling. As such, the need to make our customers’ lives easier is a foremost demand in almost any industry.

Primitive Glass Bottle Sealing

Older technology for sealing glass jars made use of heat shrink bands and unreliable universal induction foils.

Heat shrink bands can be a fickle tool to use. On the production side of things, applying heat shrink bands onto the glass jar can be a tricky and sometimes dangerous setup. It involves high-temperature heat guns, blowers, or steam tunnels. It also deals with a lightweight film that could come either in individual pieces or in tube form. This film format necessitates consistent placement and finishes which can be arduous to have to meet each time.

For clients, heat shrink bands can bring a very unfriendly user experience. These bands are difficult to remove. And with the idea in the consumers’ minds that “glass = good for the environment,” having to remove a piece of transparent PVC plastic the very first moment they need to use the product, can be quite off-putting.

On the other hand, some manufacturers decided to use universal induction foils for glass sealing. Even at the time, these induction foils for glass had already been available for a long while. However, this technology proved to be effective mainly for dry products and powders only. Wet or oily products can initially appear to be sealed with said foils, but over time, what looked like well-sealed products ended up having a foil that lifted off the sealing rim “on its own.”

Now, in a time when consumers value good quality and trust in the products they use, having foil seals for bottles that detach themselves from the glass jar can be detrimental to sales.

Glass Liners

In recent years, there have been advances in glass jar sealing. Innovation in the field has now given manufacturers the opportunity to seal not just dried goods in glass jars, but also wet and/or oily products such as coconut oil. With our team’s solutions, we are also able to cater to this growing demand both from manufacturers and their consumers.

Benefel Pty Ltd and Adeneli Packaging

Our teams at Benefel Pty Ltd. and Adeneli Packaging can help you with your glass jar seal material. Our experts are on standby to take your calls and chats. Whatever product you may have, we have the perfect liner material for you. Product consultation is free and we are happy to develop partnerships with our customers by supplying consumable products that work well with packaging machinery.

Affordble Induction Machine

Tamper Evident Jar Labeling - LabelOn™

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Investigating Glass Induction Sealing

Below are excerpts from an email that was sent for an inquiry which we published on this blog as part of FAQ.

Thank you for your earlier messages and a link you sent I see the glass you are considering to use for induction sealing looks like the following:

Your Questions 01:
It has been confusing, because I have gotten or read contradicting things. Mostly I have been told that we should use CONDUCTION machines for glass, because most INDUCTION relies on caps. I have also been told that there is only one kind of liner/seal that works on glass, and that is called INDUCTION (very confusing).

I believe both of your companies Adeneli and SealOn only make INDUCTION machines, and lids/seals for INDUCTION machines, not CONDUCTION. Is this correct?

Even though I read on your website, that INDUCTION LINERS only work on INDUCTION machines, again that contradicts what others have said so I wondered if you could elaborate on that. Why do you say it won’t work with CONDUCTION machines?

Our Answers01:
Our specialty is Induction Machinery.

We can tell you that usually induction sealing is done on products that have caps because the induction seal is held in the cap against the containers sealing edge with some cap tightening force for the induction cycle.

Where there is no cap on the product or where the cap interferes with the induction process (either it has Metal content or is an unusual shape) we have a very special range of induction sealers called “Capless Induction Machines”

Glass Induction Sealing is a tricky area of induction sealing dependent on the glass and the contents as it involves a hot melt adhesive layer which will perform quite differently depending on:

-The glass
-The contents
-The induction sealing material
– The induction sealing parameters including:
– The length of the induction cycle
– The Intensity and the “profile” of the induction cycle
– The pressure on the seal during the induction cycle
– The cooling period before releasing the pressure of the sealing head
– The shape of the induction coil; sometimes it needs to extend “around” the lip of the container
– The dead fold properties of the foil

Heat Conduction machines are NOT our specialty, however, I can tell you they rely on a sealing surface to be heated using heating elements and the sealing surface needs to maintain a temperature that is in a range that suits the sealing material and the container such that the sealing material and the container can fuse/melt together.

When sealing onto Plastic , which is not much of a heat sink, maintaining the sealing surface temperature is quite straight forward and you can expect the material and container to fuse/melt together.

The heat source for an induction machine is the induction process onto the sealing foil – it is an instant source of heat for the period of the induction cycle. When sealing onto glass it is usually a process of melting an adhesive (under pressure), and allowing the adhesive to cool/set before you release the pressure

Your Questions 02:
I see that you say you have cap-less that works on glass but I can’t tell if they can be custom printed, and roll over the sides like we want. I also can’t tell if you have smaller scale, table top machines, that are manual or semi-automatic that would work for the cap-less glass application. I doubt we could invest in a large conveyor belt automatic machine at this time.

Containers-I have also read about possible specially treated glass for using foil lids, but I can’t tell if this is a necessity or not and if so how to go about it. The place I read this regarded yogurt, and since ours is not a food product or liquid or powder, I wonder if this treated glass makes the bond much stronger for those purposes but that it would still seal without treated glass. Because for our purposes it would not have to be overly strong, and we want to have it fold down the sides which would help secure it.

Our Answers02:
On our side we can provide glass sealing induction foil.
For induction foil the MOQ of foil is 3000m² = 32000ft² – Probably too much for a pilot operation
If your Glass opening was 75mm or 3” in Diameter that would equate to about 470,000 Glasses
We can also supply this material in much smaller quantity without printing – MOQ about 10,000 candles worth.

The entry level machine that we are confident works with our Material (subject to tests) is our Benchtop Capless Machine.

The Sealed finish is as you see it in the video – a little bit wrapped down the side but not much.

As your contents are not food and essentially dry it should be straight forward, however, if your product contains essential oils these can wear away at a what looks like a good induction seal; so you need to test the longevity of the seal.

For more of a wrap down the sides it can be done, though, for pilot operations the material needs to be supplied pre-formed.

Pre-formed liners require tooling charges and the pre-formed liners are a lot more expensive than simple pre-cut flat liners.

Again, for pre-printed you need to purchase that MOQ.

Note with plain liners you can always get labels to apply to the sealed glass. We have label partners we can put you in contact with.

We also have the ability to provide you with the Epson Colorworks printers where you can print your own labels.
I hope this is a good start for your look into machinery and materials to achieve the induction sealing across the top of your products packaged into Re-purposed Glass.

If you are looking for affordable and trustworthy Labelling, Sealing, and packaging machinery, visit Adeneli Packaging websites and talk to one of our machine specialists,

Give us a call at (844)-233-6354 (844-ADENELI) or click the direct chat link below!

http://adenelipackaging.com – https://label-on.com/ – https://sealeron.com – https://capliningmaterial.com

*Labeling vs Labelling: We understand that you may see ‘labeling machines’ and ‘labelling machines’ within our web content. These are synonymous- just spelled differently in different regions of the world. We want our posts to be available to our world-wide audience, so we freely interchange the spelling to encourage easy searching for our content. Please rest assured, we are doing this on purpose!

Induction Sealing Statistics – How You Must Get The Right Cap and Lining Material Combinations

This discussion below is an excerpt of a client discussion we have prior to supplying equipment.

We don’t have to do this; we could be like the ebay or Alibaba or “one stop every machine under the sun supplier” but we are not as we like to think of ourselves as a supplier invited to be a part of your team going forward.

The discussion:

“Hi Team,

I can see there is significant concern over the advice you are receiving about the cap lining material.

The cap lining material specification you sent is the correct “type” of lining material in that it has the correct sealing layer.

We can test seal all the Jars and produce excellent sealing; the sample size is only a dozen or so – this could lead you into a false sense of security if we did not forewarn you the combination of material should have softness in it.

Our knowledge on the matter is significant; beyond most suppliers of induction equipment as we have significant experience in supplying cap lining material to cap manufacturers and even the high ticket equipment that inserts the cap lining material for the cap manufacturers. See our website: https://www.capliningmaterial.com/

I have personally been involved in the selection of induction sealing materials for projects by multibillion dollar companies including Nestle and I have dealt personally with the world’s top 5 cap lining material manufacturers.

The advice below stands:

Hand Torque is part of the equation. Though a poorly applied cap ; even when it has soft lining material or a foam backing can result in unsealed products.

The part I am focussing on is cap and bottle tolerances. I am not sure the cap manufacturer will give a cap tolerance for the flatness of their caps to within +/- 0.2mm.

Similarly the bottle/jar manufacturer may not give a height/flatness tolerance to within +/- 0.2mm with respect to the plain of the top lip of the container. From quality manufacturers, most of the caps/jars may fall within this tolerance though there will be a statistical amount that are outside of this; when tolerances add you can get a case where a 0.25mm thick hard liner will not have enough give to make up for the mismatch of the top plane of the jar neck with the underside plane of the cap. In this case there will be sections of the liner that are not in contact with the jar during the sealing process.

Standard practice is to have some softness behind the liners or very tight control on the capping process and the allowable tolerances on the caps and bottles provided.

For your operations – especially as you are growing it is highly recommended you have either:

a) Softness in one of the layers of the induction lining material

b) A separate foam liner behind the induction liner

Note: for higher volume hand operations we recommend a cap tightener due to the inevitable human error factor

“The purchasing decision to focus on here is the caps and the lining material.

If I was an owner in your business I would suggest the following path.

If time is against you – for your initial launch etc- ; go with what you have and perform a 100% test on what you seal before you send it out. If we are talking about only hundreds of units at a time it is a cumbersome, but, worthwhile task.

First impressions are everything at that stage and a leaking jar of product can be a “game over” at this stage.
Here’s a video of a suggested test that can help you be confident you have a sealed Jar: https://goo.gl/VVFCRK

New Time Trials - Fused liner test and Circumference Seal Test

2. Going down the track insure you have some softness in your cap/liner combination.”

If your cap supplier can’t do it (maybe because your volumes are too small) you should purchase the caps without liners and source liners from a liner supplier for separate insertion prior to sealing; you will need to source about 10,000 at about 12 cents each (my guess) – We can put you in touch with the supplier to the liners for the SealerOn gallery I showed you for the Nuts.

We want you to move forward with a sound understanding of how you can reduce the statistical probability of sending out products that could leak.

Glass Liners in The Demand for Glass Jar Packaging

Traditional Glass Sealing

New Technology in Glass Liners

Benefel Pty Ltd and Adeneli Packaging

Primitive Glass Bottle Sealing

Glass Liners

This discussion below is an excerpt of a client discussion we have prior to supplying equipment.

The discussion:

MeRo Induction Systems feature:

Depending on the range of product and cap/lid/closure shapes, different sealing heads can be supplied.

Options include:

USA Head Office

Australia Head Office

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