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Heil and Esch · Public domain (1909)
Rubber Stoppers: Pará Rubber with Ceresine, Moulded and Cured (Heil & Esch 1909)
Laboratory rubber stoppers from a 1909 rubber factory's book of mixings: Pará rubber with ceresine wax, sulphur and magnesia, run out as a cord, cut to weight, pressed into moulds and cured.
Source: Heil & Esch, The Manufacture of Rubber Goods (1909), mixing No. 34 (p. 108) and the stopper method (p. 135). They give no cure time or temperature. Using smoked ball rubber as their Pará, and the mill, clamps and steam vessel, are ours. Picture: their page of mixings.
中级
1 day
说明
1
1
Weigh mixing No. 34
Weigh mixing No. 34
Weigh out 10,000 g Pará rubber, 2,000 g ceresine, 1,000 g sulphur and 100 g calcined magnesia (magnesia usta).
此步骤所需材料：
烟熏橡胶球10000 克
纯地蜡2000 克
硫磺粉1000 克
氧化镁100 克所需工具：
等臂天平2
2
Mix on the rolls
Mix on the rolls
Work the rubber on the mixing rolls and work the ceresine, sulphur and magnesia into it until the mixing is even.
所需工具：
双辊开炼机3
3
Run a cord on the tube machine
Run a cord on the tube machine
Run the mixing through the tube machine as a cord of a size to suit the stoppers. It must be free from air bubbles, or the stoppers will be faulty after curing.
所需工具：
橡胶压出机4
4
Cut pieces to weight
Cut pieces to weight
Cut the cord into pieces of the exact weight of one stopper plus 2 or 3 per cent, for what squeezes out of the mould.
所需工具：
手工刀等臂天平5
5
Press into moulds and clamp
Press into moulds and clamp
Press each piece into a mould and clamp the small moulds very tightly in iron clips.
所需工具：
硫化模具
C 形夹6
6
Cure in steam
Cure in steam
Cure the clamped moulds in a steam heater (Heil & Esch also name the sulphur bath). They give no time or temperature for stoppers; then open the moulds and take out the stoppers.
所需工具：
台式高压灭菌器硫化模具此蓝图制作
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