Cap Lining Materials and Induction Sealing Machines

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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:

drinking glass for induction sealing

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?

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.

SealerOnCaplessKRPreview

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.

formed seales for glass capless precut

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!

chatnowtransparent

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!

Treating Induction Liners as Contents

industrial-safety Image

Food Grade Induction Liners

Big Brand Cosmetic and Food Companies value their product being produced in Western Countries like the USA, Canada, Australia, New Zealand, The UK, Germany and France.

For example, a Salt Scrub that says produced in Canada carries a lot more appeal to clients and Brand owners alike than a product that says “Made in China”; Especially a product that you will Ingest or put into Direct Contact with your Body.  The reasons are really quite obvious – it is common knowledge that in some parts of Asia where there is a huge ether of manufacturing, completely regulating all practices to be safe is a very difficult task. This leaves open an unacceptable risk for many consumers who will understand that “somewhere” in the chain of processes that go into the finished product something can more easily go wrong.

It is not uncommon to source packaging from Asia and then produce the contents in a more controlled and higher profile country or location.

If the brand (and clients) see value in knowing the contents are produced in a safe and controlled location then Induction Liners should NOT be considered as separate from the contents or as simply “inert” packaging.

Safe Induction Liners

The sealing layer of an induction cap liner that comes into contact with the inside area of your packaging is a plastic polymer and or an adhesive. Often cap suppliers will provide this lining material without paperwork to identify and qualify the material fit/safe for purpose. For example the liner may only be suitable for industrial chemical contents.

During the induction sealing process, the lining material is heated to a point where their sealing polymers and adhesive are in a liquid/molten state. This can OFTEN mean liners from unknown suppliers in China will have a polymer cocktail that can leach into your (your clients) product*.

The process of induction sealing could therefore result in some nasty compounds becoming an extra unintended ingredient in the product.

Please be assured that we are only raising this point to make sure you are aware of this possibility and to allow your client and you to complete a due diligence for the manufacturing of a product that will be in contact with people’s skin.

From our experience, the least that can be expected from a supplier of caps with lining material is to be given a cap lining certificate of compliance with food and commodities; supplied, on the letter head of the manufacturer of the lining material. It is not sufficient to have such a document issued by the cap supplier or a lining material agent that simply puts their letter head at the top of a generic declaration.

“Food for thought”

All our liners are manufactured using lining materials that have a cap lining certificate of compliance with food and commodities; supplied, on the letter head of the manufacturer of the lining material.

*Even the Foam we supply for fitting behind induction liners is resistant to the heat process of the Induction Sealing and this foam comes with it’s own certificate of compliance with food and commodities.

Often the first thing our clients realized with respect to how things can go wrong with Seals from Asia or India is inconsistency of sealing results. That problem , while a practical problem is a relatively minor problem. That is a relatively safe issue and it is well-known that this will often be due to variations from batch to batch of liners produced in these regions.

The safest way to treat induction lining material (and source it) is as if it were the contents.

Cap Liner Types and Functions

Tribe Example on Cap Liners

A cap liner is a piece of material that sits between the cap and the bottle. Its traditional primary purposes are to offer proper sealing of the product to prevent leakage and optionally to provide tamper evidence.

New technology is now turning this humble piece of packaging into a multimedia gateway for brands to reach out to their consumers through the Tribe Platform.

Since the cap liner is something only seen by the consumer after the product has been opened, the cap liner can essentially facilitate a “cap coupon”.

Tribe Example on Cap Liners

Since the cap liner is in direct contact with the product, chemical compatibility and correct certification for contact with your kind of product is crucial. Using the wrong seal can lead to expensive and sometimes dangerous mistakes that can jeopardize your product brand and integrity.

Chemical products and consumer/food products can require liners that differ significantly in their properties. The varying liner materials have different jobs. They may be used as any combination of moisture barriers, oxygen barriers, chemical resistant barriers, consumer tamper evidence safety and for preventing leakage.

The cap liner material alone can significantly affect the cost of the cap, not to mention the impact on the finished product.

Compatibility of the caps, liners and bottles has to be tested; as well as the compatibility of these packaging materials to the product inside.

Selecting the Right Seal

Novice producers may find it difficult to decide which cap liner is the right solution for their product. With all the different liner types available, choosing the correct liner for your product and container is an important step.  If considering cap lining material it may be worthwhile looking at how a practical packaging initiative and a practical marketing initiative can be combined.

A wide range of cap seals are available but by focusing on these key questions, we should be able to narrow down the field:

  • Level of tamper evidence required?
  • Type of product: liquid, powder, or solid?
  • After opening the product is a reseal important?
  • Will the Seal be used to promote the Brand?

Some Popular Cap Liners

  1. Plain Expanded PE foam. Providing both a seal and reseal, this is one of the lowest cost cap lining materials available.  When produced using C02 Gas the cell structure of this material can be tight and present and perform close to that of some laminated foams produced with less sophisticated methods.
  1. Laminated Expanded PE foam. As per the Plain foam this material has added layers often on both sides to provide a smoother and more chemically resistant sealing surface. With the right laminates this material can have Good resistance to acid, alkalis, solvents, alcohols, oils, household cosmetics, and aqueous products. Aluminum, Tin or Saran are common coatings used for alcohol with Tin being particularly popular for Wine bottles with screw caps.
  1. Pressure Seal Foam Liner. Coated with torque-activated adhesive, the action of applying the cap causes this seal to bond with the bottle or product opening; there is no need for an outside heat source. Historically this type of seal was applied to provide tamper evidence and often printed with words that would infer that the seal was a form of tamper evidence. You will now notice that on any credible supplier’s specification sheet they will go out of their way to state this is NOT a seal to provide tamper evidence.  This is to avoid potential legal claims associated with the possibility this type of seal can be tampered with and reapplied without any special equipment. The Moisture and oxygen barrier of this type of material is also generally lower than laminated foams.
  1. Induction Liners – When passed through an induction process, the foil layer heats up in a process that will bond all or part of the lining material to the top of the product. Induction liners can only be applied using an Induction Sealing Machine.

There are 2 types of Induction Liners:

  1. One-piece Foil. Since it “sticks” to the bottle after sealing, this single-use foil is one of the most common forms of sealing. Side tabs and Lift ‘n’ Peel™ options add to the experience of easy removal from the lid for items like milk and juices. An added barrier layer can also provide protection against aggressive products. An air and watertight hermetic seal prevents leakage in packaging for edible oils, water, juices, condiments, shampoos & conditioners, gasoline treatments, additives, food & beverages, nutraceutical products, health & beauty products, vitamins, spices, and pharmaceutical products.  Often a one piece Foil will need to be applied over a softer and thicker foam based liner to insure a good distribution of pressure from the cap over the entire opening of the product to be sealed.
  1. Two-piece Heat Induction Liner – The benefit of using two-piece heat induction liners is that they eliminate the need for lining the closure in two separate stages: The base foam or cardboard layer of the  liner is temporarily bonded to the foil with either a wax and paper layer or a separating polymer layer.

Caps with Liners

caps with liners

Caps and Closures

As we deal with so many cap manufacturers we are able to source and supply you with the cap and cap lining material combination you are looking for without the need to separately supply you with cap lining material. The caps are supplied from cap manufacturers for whom we have an established trading relationship.

These cap manufacturers will almost always sell through third parties and we have qualified with many cap manufacturers to be that third party. We insure the pricing we supply is equal to or better than if you had gone to other third parties or EVEN the cap manufacturer themselves.

Our knowledge and involvement in the supply of Cap Lining Material, Lining Inserting equipment for the cap manufacturers and induction sealing equipment for the end user means we can help source “get-it right first time” combinations of caps with cap lining material and supply at very competitive pricing.

caps with liners
caps with liners

 

Precut Liners, Roll Form Lining, Caps with LinersPrecut Liners, Roll Form Lining, Caps with Liners
InductionSealingExample01InductionSealingExample01
Single piece cap linersSingle piece cap liners
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Induction Material Liner

Two Piece Material Liner

Material Liner is what we call that piece (or pieces) of what looks like paper inside product caps. It is also referred to as induction foil, induction sealing material, foil seals and induction seals among others. Many people are unaware of the purpose they serve to the product aside from being a protection seal or a tamper proof seal.

Material Liner Purpose

Material liner within caps can be one piece or two pieces depending on the expected purpose of the lining material.

Single piece cap linersSingle piece cap liners are often present in smaller sized containers in which the product is likely to be consumed after opening. Its packaging is regarded as being one time use packaging.  In this instance, the liner functions as protection until the product is opened. No other material is left inside the cap.

 

 

Two Piece Material LinerLarger packs or bottled items are not likely to be completely consumed right after opening. The consumer is more anticipated to reclose the container and store the product. The caps used on these conditions have demands for caps that reseals effectively. Upon close examination, the caps used on these kinds of merchandise have laminated foam within. This lamination enables the cap to reseal the container upon closing to maintain product freshness.  The laminations within the cap as well as the removed tamper evident seal on the product are referred to as two-piece cap liners.

Deciding on the best components and structure of your foil seal is essential to guarantee the proper amount of protection for your merchandise. We can help you in selecting the type of material as well as the construction suitable to your application.

We have induction sealing materials available in many variants to fulfil almost any standard or individualized product packaging requirement which are safe and meet the strict specifications set by the Food and Drugs Authority.

Effective for products that must be kept free from contamination, oxidation and moisture, tamper evident hermetic seals are best suited for use in the following production:

  1. Food & Beverage
  2. Drugs
  3. Alkalies
  4. Acids
  5. Oils
  6. Organic solvents and products
  7. Flammables,
  8. Powders
  9. Pellets
  10. Other products

Induction foils are generally supplied to the closure manufacturers. Developed over 35 years ago, induction sealing, in the beginning, was designed to eliminate leakage of chemicals from plastic bottle caps. At present, this method works extremely well with most style container and closure.

Induction Sealing Process

The caps are supplied with an induction foil waiting to load into the capper. The container is then filled and capped, using the caps that are pre-lined with the induction foils.

The capped container is then transported down the conveyor line and travels underneath the induction sealing head. The electromagnetic field generated by the sealing head penetrates the cap and the aluminum foil layer. When the field permeates the foil, it causes an electrical current which melts the liner’s sealing film. The foil cools down as it leaves the induction field causing the heat seal film bond to the container. Once the cap is removed, the aluminum foil remains bonded to the lip of the container.

You can trust our team of experts to provide you the best solution to your application requirement. Contact us today!

Precut Cap Liners

Because we supply the “big boys” with cap lining material we know our field and we utilize piggy-back productions and stock rolls to be able to service large and small clients alike.

Pre-CutCoffeeText Markup
Pre-CutCoffeeText Markup01

 

1.0 Valued Clients with Small Scale Cap Liner Requirements:

For the contract Manufacturer, Cosmetics Company, Boutique and Cottage Food Industries, Spices and Small Enterprises, the use of induction liners can give a big boost to their product image and integrity.  Finding caps with the liners you need can be difficult or not yet available in the smaller quantities you are dealing with.  Loose packed pre-cut liners can be supplied with very short notice; within 2-3 weeks and sometimes much faster.  We are at the concluding stages of developing IP that will see lead times fall to well within one week. We use methods that enable cutting tools to be produced for hundreds of dollars rather than thousands of dollars so if your size is unique do not worry.

2.0 Larger Scale requirements and working with Cap manufacturers:

We are introducing tube packed pre-cut liners as an alternative to the more traditional roll form supply of cap lining material.

2.1  Small Scale  Cap Liners

Tube packed pre-cut liners are introduced for the small scale and pilot projects as it solves labor considerations and can be combined with cost effective budget liner-insertion-machines.

2.2  Large Scale Cap Lining

In a kind of paradox, the very large scale projects are often best served with pre-cut tube packed liners.  The liner inserting equipment is of a much higher sophistication level but the pay-off comes in the better material yield, the elimination of maintaining knifes and dies, the elimination of dust and particle consideration, the more efficient shipping costs for the lining material and the elimination of disposal consideration for the waste generated from cutting from roll form stock.  Behind the scene of pre-cut supply, the more savvy pre-cut liner manufacturers also have scavenging and recycling techniques in line with their pre-cut operations to make use of the offcuts generated and this results in a cleaner environmental footprint for this format of cap lining material.

2.3 Innovative Pre-cut Cap Lining Options

We also supply pre-cut liners with innovations that are quite unique and specific to the pre-cut format.  Liners with backing having built in pull tabs often require a pre-cut format of cap lining material.

 

Precut Wine Closure LiinersPrecut Wine Closure Liiners
cosmetic caps and linerscosmetic caps and liners
Two Piece Material LinerTwo Piece Material Liner
InductionSealingExample01InductionSealingExample01
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Roll Form Cap Lining

Roll Form Induction Lining
Roll Form Induction Lining
Roll Form Induction Lining

 

Roll Form Cap Lining Material is supplied to our clients that use Liner Insertion Machines and it can also be supplied clients that are using Capless Induction Sealing Equipment that is roll fed. Usually our clients are dedicated caps and closures manufacturers or importers.  There is a growing trend for some of the higher volume FMCG manufacturers to bring cap and bottle production in house and they are pleased o learn we are able to assist with Roll Form Cap Lining Material.

RollForm FCL Delivery Induction LiningRollForm FCL Delivery Induction Lining

 

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Precut Liners, Roll Form Lining, Caps with Liners

Precut Wine Closure Liiners

We supply pre-cut cap lining material for clients who cannot find cap suppliers with the cap and cap lining combination they need.

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