什么是全手工壶?什么又是半手工壶?新手又怎样加以辨别?下面先讲两种紫砂壶成型方式的工艺流程。
模型成型的半手工工艺程序:
先由制模开始的,把石膏浇成圆柱状,在专用的车台上用专用的车刀,把圆柱形石膏成所需要的母模,配上壶嘴、壶把、壶钮,待石膏干后打好泥片后用泥先围成圆筒状,稍加拍成鼓形,分开石膏外模型,把鼓形泥筒放进石膏外模内使左右外模对榫夹紧然后用铁丝固定外模,用工具或手放进外模内挡坯,使鼓形泥筒完全紧贴在外模内壁上,然后放在一边,待收干,然后泥坯会自行和外模脱离,再用盖的外模挡壶盖,用壶嘴、壶把、壶钮的外模印出它们来,然后待稍干,把壶身、嘴、把、钮、盖的坯体从外模中取出整理后按上壶嘴、壶把、壶钮,再把壶嘴、壶把、壶钮的接缝修正用明针(也就是牛角片)整平、打光。
全手工抟坯成型的工艺流程:
把泥展开成长条泥片,用泥片车画出所需要的泥片高(宽度)、长度和弧度,再把泥条围成筒状,用木制的拍子打拍成所需要的形状加底口的封片,待干后进一步用带弧行的竹范整型(为用手拍不可能达到同心圆程度所以要用竹范重新整理,使其达到相对圆整)再加塑上口片和底足片待干后用矩车开出足圈和口来,整理足圈和口片跟壶身筒的接面,再做壶盖(弓形壶盖分成弓弧形泥片,平面泥片和撮口三部分组成把这三部分加塑完成后开掉撮口内的平泥片整理完成后按上壶钮后再按照壶身的比例塑壶嘴、壶把。按照“把随壶身走,嘴随把尾出”的理念按上壶嘴、壶把,尽量的使其在壶身的半经线上处理壶身和壶嘴跟壶身的接触面使其顺畅后再用明针“了”光,打上印底印,待干后进窑烧成。
以上两种不同的成型工艺可以看出,半手工壶工艺流程做成来的壶任何一个造型绝不会仅仅只是一个,而全手工壶却有着不可复制性。抛开这点不谈,半手工壶在挡坯的过程中因用力挤压,使泥料的被压紧,跟全手工壶相比透气性要差了些。
那么如何识别呢,下面用图片加以说明:
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