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Rubber Squeeze Bulb: Latex Coagulated Inside a Split Mould Coated with Calcium Nitrate (Szegvari, Anode, US 1,949,502)
Charlie

Créé par

Charlie

30. octobre 2026DE
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Rubber Squeeze Bulb: Latex Coagulated Inside a Split Mould Coated with Calcium Nitrate (Szegvari, Anode, US 1,949,502)

A seamless hollow rubber bulb grows inside a closed mould: the cavity is coated with a coagulant, the mould is filled with latex, and rubber sets on the walls until it is thick enough. The rest of the latex is poured out through the neck. Result: a seamless rubber squeeze bulb with a neck; ours sized at about 60 ml. Source: Szegvari, US 1,949,502 (American Anode, 1934); his example is a football bladder. Not given: times, strengths, vulcanising details. Picture drawn by Youblob.
Intermédiaire
2 days

Consignes

1

Coat the mould cavity with calcium nitrate in acetone

Open the split mould and coat only the cavity with a solution of calcium nitrate in acetone, by brush or spray. The acetone evaporates and leaves a sticky film of coagulant. Ours: a cavity of about 60 ml with a neck.

Outils nécessaires :

Nitrate de calciumNitrate de calcium
AcétoneAcétone
Moule à balle en deux partiesMoule à balle en deux parties
Brosse largeBrosse large
2

Close the mould under the latex

Lower both halves under the surface of latex and close them once they are submerged and the air bubbles are gone. Rubber now sets on the coated walls; the longer the contact, the thicker the wall.

Matériaux pour cette étape :

Latex de caoutchouc naturelLatex de caoutchouc naturel1 as required

Outils nécessaires :

Grande marmiteGrande marmite
3

Pour out the extra latex through the neck

Lift the mould out and turn it over so the liquid latex drains back through the neck. Refill with water holding a little acetic acid so the inner face sets too.

Outils nécessaires :

Acide acétique (glacial)Acide acétique (glacial)
EauEau
4

Open under warm water and leach

Open the mould under running warm water, take out the bulb and leave it in the water until most of the soluble matter has leached out. Clean any liquid latex off with dilute ammonia.

Outils nécessaires :

EauEau
Solution d'ammoniac diluéeSolution d'ammoniac diluée
5

Inflate lightly and dry

Drain the bulb, inflate it lightly so it does not collapse, and dry it at room temperature or in a drying cabinet. The latex may hold sulphur and be vulcanised in the usual way; Szegvari gives no details.

Outils nécessaires :

Étuve de séchageÉtuve de séchage

Matériaux

1

Outils requis

9

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