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

أنشأه

Charlie

30. أكتوبر 2026

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.

متوسط

2 days

التعليمات

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.

الأدوات المطلوبة:

نترات الكالسيوم

أسيتون

قالب كرات مشقوق

فرشاة دهان عريضة

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.

المواد لهذه الخطوة:

$لاتكس المطاط الطبيعي$ لاتكس المطاط الطبيعي1 as required

الأدوات المطلوبة:

قدر كبيرة

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.

الأدوات المطلوبة:

حمض الخل (الجليدي)

ماء

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.

الأدوات المطلوبة:

ماء

محلول نشادر مخفّف

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.

الأدوات المطلوبة: