Studies on the Prototype of Foam Dyeing Apparatus aimed to Water-, Energy-saving and Environmental Protection

泡沫染色方法与传统的间歇染色方法在启动条件上有根本的不同，即染色底物和含有染料、发泡剂和助剂的散装液体是相互分开的。泡沫染色方法中的染色操作如下进行。首先，将散装液体加热到所需的温度，空气通过玻璃球过滤器吹入散装液体并完全分散。泡沫膜中含有染料的泡沫是连续形成的，并作为染色槽上升到玻璃管中。在给定的染色条件下，染色基材最初被浸湿，泡沫输送的染料分子被吸附在涉及基材内表面的基材-液界面上，并均匀地扩散到基材中。从染色槽流出的泡沫被引入加热式泡沫破碎机并消泡。在利用泡沫染色装置进行的基础实验中，我们得到了以下结果：1)在机器的染池中设置中心管和/或内壁，以防止泡沫排水造成的染色不均匀。2)空气流量对可染性的影响很大，与泡沫量和泡沫上升率有关。对于泡沫染色设备，空气流量在15~20升/分钟的范围内可产生良好的可染性和均匀性。3)所用两种染料的相容性指数(CI)可能有较大差异。但他们并没有特别指出不相容的地方。因为在目前的条件下染色的尼龙6织物上的染料总量并不比尼龙6织物的氨基末端基数多很多。

The Foam Dyeing Method fundamentally differs from conventional batch dyeing methods in starting condition so that the dyeing substrate and the bulk liquid, containing dye, foaming agent and auxiliaries, are set apart each other. Dyeing operation in the Foam Dyeing Method is carried out as follows. For the start, the bulk liquid is heated up to a desired temperature and air is blown into the bulk liquid through the glass ball filter and dispersed entirely. The foam, containing dye in its foam film, is formed continuously and rise into the glass tubing as dyeing sink. Dyeing substrate initially wetted and dye molecules transported by the foam is adsorbed on the substrate-liquid interface that involves the internal surface of the substrate, and it is uniformly diffused into the substrate under the given dyeing condition. The foam over flows from the dyeing sink is led to the heating foam breaker and defoamed. The residual dyeing liquid returns to the flask of the bulk liguid through the thin glass tubing for circulation.In the fundamental experiments using the Foam Dyeing Apparatus, we obtained following results.1) The center tube and/or inner wall are set in the dyeing sink of the machines to prevent uneven dyeing be caused by the foam drainage. The distribution of the opening area of them must be exponentially increased at the upper part.2) The air flow rate intensely effects on the dyeability in connection with the foam volume and the foam rising rate.For the Foam Dyeing Apparatus, the air flow rate in the region of 15 to 20 litter par minute produce the good dyeability and the uniformity.3) The compatibility indexes (CI) of the used two dyes may be relatively different. But they didn't particularly indicate the incompatibility. Because the total amount of the dyes on the nylon 6 fabric, dyed under present conditions, not so much exceed the number of the amino end groups of the nylon 6 fabric.