Sainsun PVAWhat film grade do dye packs use?
It is matched to the temperature of the bath or process water. Low-temperature dye baths use a cold-water grade; hot dye baths use a hot-water grade that dissolves fully without leaving a residue on the goods.
Application · Dyes and powders
Packs for dyes and powders
Dyes and pigments are the messiest thing in any workshop and the hardest to dose accurately. A water-soluble sachet solves both at once: the operator drops the sealed pack into the bath and the colour goes in without a cloud of dust or a stained bench.
What these packs do
A water-soluble dye pack holds one measured dose of dye, pigment or powder. The user puts the sealed pack into the dye bath, the washing machine or the process vessel. The film dissolves in the water and releases the dye directly into the liquor.
The benefit is twofold. Dosing becomes accurate and repeatable, because the pack is filled to weight rather than scooped. And handling exposure disappears — no dust cloud when the powder is poured, no residue on the work surface, no contaminated packaging to dispose of.
Where they are used
- Textile dyeing — measured dye doses for batch and sample dyeing.
- Laundry and garment finishing — colour and finish additives dosed directly in the machine.
- Inks, coatings and pigment dispersions — pre-weighed pigment packs for small-batch production.
- Specialist powders — where a measured dry dose has to enter a water-based process.
What we make
| Specification | What we supply |
|---|---|
| Film grade | Matched to the temperature of the bath or process water |
| Format | Sachets and bags made to your dose weight and dimensions |
| Film thickness | Set against dose weight and how the pack is handled |
| Plain, or printed with product code, shade reference and branding | |
| Opacity | Clear film where the contents should be visible, or opaque where light exposure matters |
| Outer packing | Cartons or retail packs under your brand |
What to specify when you enquire
Enough to quote accurately
- Dose weight per pack, and the powder or dye type
- Bath temperature and whether the water is soft or hard
- Whether the pack is added by hand or dosed automatically
- Whether the contents need to be visible through the film
- Print requirement — shade codes, product references, branding
- Target quantity and destination market
Why dosing accuracy is the real product
Anyone can fill a sachet. The value is in the accuracy and the repeatability. A shade that has to match a reference has to be dosed to the same weight every time, and a sachet filled to a defined weight removes the variable that spoons and scoops introduce.
Film choice then follows the process: the film has to dissolve fully at the bath temperature, without leaving a residue that could mark the goods, and without softening or fusing during storage before use.
Common mistakes
- Choosing film by cost instead of by bath temperature. A hot bath with an under-rated film leaves a residue; a cold bath with an over-rated film leaves an intact sachet floating.
- Not checking storage. Powders with high free moisture can soften the film from the inside over months.
- Printing before the pack size is fixed. Shade codes and product references need space, and space changes the pack dimensions.
- Skipping the trial. The only test that counts is your dye, in your bath, at your temperature.
How ordering works
Send the dose weight, powder type and bath conditions. We reply within one business day with a film recommendation and a sample plan. You test the samples in your own bath. Bulk production starts only when the pack performs as agreed.
Related reading
For how film grades are matched to process water temperature, read PVA film grades: cold, warm or hot water?. For the printing and dosing considerations on the agrochemical side, which share much of the same ground, see Water-soluble packs for agrochemicals: dosing and print.
Quick answers
The questions buyers ask most about this application.
Can the dye pack be printed with a shade reference?
Yes. Packs can be printed with product codes, shade references and branding, or supplied plain. Print requirements should be settled early because they affect the pack dimensions.
Will the film leave a residue on dyed fabric?
The film is selected to dissolve completely at your bath temperature, which is what prevents residue. This is confirmed during sampling using your dye in your bath rather than on a bench test.
Can the contents be visible through the film?
Yes. Clear film can be used where the operator should see the contents, or an opaque film where light exposure is a concern for the dye.
What quantity do I need to order?
It depends on the pack size, the film grade and any printing. Send your target quantity with the enquiry and we confirm the exact minimum, unit price and lead time in the written quote.
Other applications
Tell us what you pack
Send your product, the pack size you need and your target quantity. We reply within one business day with a film recommendation, a sample plan and a quote.
Chat on WhatsAppor send the form — we reply within one business day