Sachet and Stick Pack Manufacturing in India: A Guide
A sachet is only as good as its laminate structure and its seals, and both are specified rather than assumed. Laminate structure, fill weight accuracy and seal integrity are the three controls. Printing minimums are the commercial constraint.
Why This Format Appeals
This guide is for brand owners considering sachets or stick packs in India.
The appeal is straightforward. A single-dose sachet removes the measuring step, which improves dose accuracy and consumer convenience. It protects each dose individually, so the last sachet is as fresh as the first. It supports trial pack formats and single-serve sales at low price points, which suits the Indian market. And it needs no scoop or measuring cup.
A stick pack is a narrow sachet designed to be torn and poured directly, often into the mouth or a bottle, and it reads as more premium than a conventional square sachet.
The constraints are the printing minimum for laminate, which is typically large, and the need for the manufacturer to have the right filling equipment for your powder’s flow characteristics.
The technical controls are laminate specification, fill weight accuracy and seal integrity, each of which needs specifying rather than left to the packer.
Specifying the Laminate
This is the most important line.
| Element | What to Specify |
|---|---|
| Layer structure | Each layer named in order, with thickness |
| Barrier layer | Material and specification, since this determines protection |
| Sealant layer | Material, since it determines seal strength |
| Total thickness | With tolerance |
| Water vapour transmission rate | Maximum, for moisture-sensitive products |
| Oxygen transmission rate | Maximum, where oxidation matters |
| Seal strength | Minimum, tested |
| Print specification | With artwork version referenced |
| Tear or notch | Position and whether easy-open |
| Food contact compliance | Confirmed with documentation |
| Reel width and specification | For the filling equipment |
Water vapour transmission rate is the parameter that most directly determines whether a moisture-sensitive powder survives its shelf life in a sachet. Specify a maximum and require the supplier’s documentation for it.
Fill Weight and Flow
Where production problems concentrate.
Powder Flow
A powder that does not flow consistently fills inconsistently. Bulk density, particle size and moisture all affect it, and all should be specified.
Fill Weight Tolerance
Specify it, and require checks across the run rather than an average. A single-dose format means fill weight is the dose.
Equipment Match
Auger, cup or weigh filling suit different powders. Ask which the manufacturer uses and whether it suits your material.
Net Weight Compliance
Packaged commodity requirements apply to the declared weight. Take professional advice on the applicable tolerances.
Because a sachet is a single dose, fill weight variation is dose variation. A powder filling at the low end of tolerance is under-dosing the consumer, which is both a quality and a label accuracy issue.
Seal Integrity
The commonest field failure.
- Specify a minimum seal strength and require testing per batch.
- Require seal integrity testing by a stated method, such as a dye penetration or pressure test.
- Require checks at the start, middle and end of the filling run.
- Assess the three-side or four-side seal geometry for your format.
- Check for powder trapped in the seal area, which causes channel leaks.
- Require seal condition assessment across stability.
- Run a transit test, since seals fail under handling and compression.
- Test a drop and a compression scenario representative of your distribution.
- Assess the tear or notch: easy enough to open, not so easy that it opens in transit.
- Assess whether the sachet pours cleanly without powder clinging to the seal.
Commercial Realities
Plan for these before committing.
Printed laminate carries a high printing minimum, typically expressed in kilograms or running metres rather than in sachets, and it converts to a large number of sachets. This is usually the binding constraint for a new brand.
One route is to start with a plain or generically printed laminate and a printed outer carton, which moves the branding to the component with the lower minimum. Confirm this is acceptable for your labelling requirements with professional advice, since mandatory particulars have placement rules.
Sachets also need an outer pack for retail, since a loose sachet has no shelf presence and limited space for mandatory particulars. That is an additional component with its own cost and minimum.
And consider the economics: a single-serve sachet at a low price point needs volume to work, because the packaging cost per gram of product is higher than for a bulk pack.
Checklist
Before committing to the format.
- Confirm the manufacturer has sachet or stick pack filling capability.
- Confirm the filling method suits your powder’s flow characteristics.
- Specify the full laminate structure layer by layer with thicknesses.
- Specify water vapour and oxygen transmission rate maximums.
- Specify minimum seal strength and require testing per batch.
- Specify fill weight tolerance and require checks across the run.
- Specify powder bulk density, particle size and moisture.
- Obtain food contact compliance documentation for the laminate.
- Establish the printed laminate minimum in sachet terms.
- Consider plain laminate with a printed carton, with professional advice on particulars.
- Plan the outer retail pack as a separate component.
- Take professional advice on net weight declaration and tolerances.
- Require seal integrity testing by a stated method.
- Require seal and content assessment across stability.
- Run a transit test including drop and compression.
- Assess tear opening and clean pouring.
- Check the per-gram packaging economics against your price point.
Considering Sachets or Stick Packs?
Share your powder, dose and volume and our team will set out laminate options, minimums and documentation.
Frequently Asked Questions
Why specify the laminate structure in detail?
Because “laminated pouch” is not a specification. The layer structure determines the barrier and therefore the shelf life, so each layer should be named in order with thicknesses, along with water vapour and oxygen transmission rate maximums.
Why does fill weight matter more in a sachet?
Because a sachet is a single dose, so fill weight variation is dose variation. A powder filling at the low end of tolerance is under-dosing the consumer, which is both a quality and a label accuracy issue.
What is the commonest field failure?
Seal failure, often from powder trapped in the seal area creating channel leaks. Specify minimum seal strength, require integrity testing by a stated method at start, middle and end of the run, and run a transit test with drop and compression.
What is the main commercial constraint?
The printed laminate minimum, typically expressed in kilograms or running metres and converting to a large number of sachets. One route is plain laminate with a printed outer carton, subject to professional advice on where mandatory particulars must appear.
Do sachets need an outer pack?
Generally yes for retail, since a loose sachet has no shelf presence and limited space for mandatory particulars. That is an additional component with its own cost and minimum, and it affects the per-gram packaging economics.