Boast D, Hale M, Turner D, Hillerton J E
Avon Rubber, Materials Development Centre, Brook Lane Industrial Estate, Westbury, BA13 4EP, United Kingdom.
J Dairy Sci. 2008 Jun;91(6):2247-56. doi: 10.3168/jds.2007-0316.
The milking liner is the interface between the milking machine and the cow. Liner properties important to milking performance were investigated for liners of different ages using discriminating tests rather than the normal, rubber-industry quality control-based tests. Large variations in the liner mechanical properties occurred depending on where the sample was taken; stiffness increased 4-fold 40 to 50 mm below the top of the liner. This was related to changes in the chemistry of the rubber created by absorption of milk-derived products (MDP) into the rubber and losses of formulation components, particularly 50% of the plasticizer and all of the antidegradent 40 to 50 mm below the top of the liner, with age and use. The presence of MDP leads to calcium and phosphate deposits on the inner surface of the liner barrel where the MDP was absorbed. The detailed liner properties can be used to explain the forces on the cow's teat and its reactions and effects on milk flow behavior, and to guide future liner development.
挤奶内衬是挤奶机与奶牛之间的界面。使用区分测试而非基于橡胶行业常规质量控制的测试，对不同使用年限的内衬进行了研究，以探究对挤奶性能至关重要的内衬特性。内衬的机械性能存在很大差异，这取决于样品的取样位置；在距内衬顶部40至50毫米处，硬度增加了4倍。这与橡胶化学性质的变化有关，随着使用年限增长，牛奶衍生产品（MDP）被橡胶吸收，配方成分流失，尤其是距内衬顶部40至50毫米处，50%的增塑剂和所有抗降解剂流失。MDP的存在会导致在MDP被吸收的内衬桶内表面形成钙和磷酸盐沉积物。内衬的详细特性可用于解释作用在奶牛乳头上的力及其反应，以及对奶流行为的影响，并指导未来内衬的研发。
