Searching for stain-resistant materials for a bag-in-bag of a lunch bag

Designing a lunch bag with wool felt is in progress. I’m thinking to put a bag-in-bag using cotton or linen cloth to protect the wool felt from a dirt even though wool is water-repellent to some extent, because wool felt is not machine washable.

Then I did a quality test on how much wool’s water-repellent nature is effective against stain. My conclusion was, “Bag-in-bag is still needed for a lunch bag, but stain on wool felt could be removed when it’s still wet”. I asked if I could keep on going with this result on this blog, and some of my readers said, “NO” on my Facebook page ;).

Why?
“It doesn’t make sense if a bag-in-bag let a dirt go through.”
“You may not always able to clean a stain off from wool felt before it dries.”

…Yes, that’s right. Then what can I do?
…I got three ideas.
1. using water-repellent cloth (e.g. nylon, vinyl)
2. applying a water-proofing treatment (e.g. waterproofing splay)
3. applying a laminate sheet

First of all, I looked for water-repellent cloths at a local shop, and found following three kinds of cloth.
A. a cover sheet that protects a car from rain and UV
B. a bedding sheet for infants preventing from bed-wetting. One side is coated with rubber-like material.
C. cloth for a diaper cover laminated on a jersey material

Colors or stretching properties of the cloths don’t seem to go well with my lunch bag, but I did a quality test again using soy sauce and ketchup to find out which cloth could work.

First, A. a cover sheet that protects a car from rain and UV. It’s made of nylon.

dropping a spoonful of soy sause on the cloth

I dropped a spoonful of soy sauce and pressed it by the bottom of a glass.

say sauce went through!

Nooo!!! soy sauce went through!

Then ketchup

Then ketchup.

IMG_1112

OK. Ketchup didn’t go through.

Next is B. a bedding sheet for infants preventing from bed-wetting. One side is coated with rubber-like material.

タオル地防水シーツにしょうゆをたらし、押し付ける。

Dropping soy sauce on the rubber-coated side and pressed.

しょうゆはしみていません!

Yes! Excellent! Soy sauce didn’t soak.

今度はケチャップ

Then ketchup.

ケチャップもしみない

Wonderful! Ketchup didn’t soak neither.

タオル地防水シーツ

But stain on the cloth didn’t go off only by wiping with wet kitchen towel. A lot of lint comes off which is not good…

Finally, C. cloth for a diaper cover laminated on a jersey material

ラミネート加工された布にしょうゆをたらす

Same again, soy sauce on the cloth. This cloth is elastic even though it’s laminated.

しみません

As might be expected, soy sauce didn’t soak.

ケチャップでもやってみます

Then ketchup.

しみない!

No stain! Beautiful!

Here came the results.

Afterward, I took contact with cloth processing companies offering water proofing treatment, and found these facts:
– Water proofing treatment will loose its effect after washing the cloth
– Water proofing treatment does not prevent a dirt from getting through the cloth (like my test “A” above.)

Water proofing treatment does not work so that the only possible way is LAMINATING.
I think the textile design of the bag-in-bag is very important, so I don’t want to choose just another laminated table cloth or something like that. But I suppose ordering laminating process on original fabric will demand me a large order….

And now, I found laminating sheet for fabric, Iron-On Vinyl! It’s durable, flexible and sew-able… I’ve already got it from the USA!

To be continued. Stay tuned :)

 

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