5.4 - Foaming processes

0.0(0)
Studied by 0 people
call kaiCall Kai
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
GameKnowt Play
Card Sorting

1/3

encourage image

There's no tags or description

Looks like no tags are added yet.

Last updated 9:55 AM on 6/20/26
Name
Mastery
Learn
Test
Matching
Spaced
Call with Kai

No analytics yet

Send a link to your students to track their progress

4 Terms

1
New cards

What’s a foam?

Material consisting of cells (tiny pockets of gas) distributed over the entire mass & that has a bulk density Lowe than the density of the original solid plastic (w/ bubbles)

2
New cards

What are the 2 types of pores geometry?

What’s the difference? Why is that important for applications?

Closed pores

→ each bubble is isolated

  • good thermal insulation

  • Waterproof

E.g.: waterproof jacket

Open pores

→ the bubbles are connected

  • air can move through

  • Liquids can enter

E.g.: sponge

<p><strong>Closed pores</strong></p><p>→ each bubble is <strong>isolated</strong> </p><ul><li><p><u>good thermal insulation</u></p></li><li><p><u>Waterproof</u></p></li></ul><p></p><p><em>E.g.: waterproof jacket </em></p><p></p><p><strong>Open pores </strong></p><p>→ the bubbles are <strong>connected</strong> </p><ul><li><p><u>air can move through</u></p></li><li><p><u>Liquids can enter</u></p></li></ul><p></p><p><em>E.g.: sponge </em></p>
3
New cards

What are the different foaming methods?

Physical foaming

→ gas is physically introduced into the material

Chemical foaming

→ a blowing agent is mixed into the plastic

Mechanical foaming

→ air is mechanically mixed into the material

4
New cards

Which plastics can be foamed?

Thermoplastics (e.g.: polypropylene)

Thermosets (e.g.: epoxy resins)

Elastomers (e.g.: natural rubber)