(under the class definition) Processes which include a step
of cleaning or polishing or otherwise mechanically or physically treating the apparatus or a working surface thereof in order to restore, maintain or bring said apparatus to a desired or necessary operating condition.
(1) Note. Preheating a mold or maintaining a mold at a temperature sufficiently high to shape thermoplastic material is deemed to be a common expedient in the art and patents reciting these steps will be classified on other steps.
(2) Note. Included herein are patents reciting a step of precooling a mold to return it to operating temperature and the use of intermittently applied purging compositions as well as physical and solvent removal of contaminants, incrustations and/or surfaces of molds, per se.
(3) Note. The use of mold lubricants applied, per se, or incorporated in the molding composition is provided for elsewhere, see the search notes below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
28, for processes including the step of cooling to 32 deg.F or O deg.C. 85, for processes which include the step of flushing of a mold with an inert (nonsolvent) liquid.
169+, for processes which include the step of preventing equipment fouling accumulations and deposits in formation of continuous or indefinite length articles, which may include e.g., addition of an ingredient to spinning composition or bath or spinnerette of a particular structure or composition.
300, for casting, molding or die shaping, per se, in which a lubricant or release agent is incorporated directly into the molding composition.
327, for processes including the step of differential heating or cooling in the mold.
338, for processes which recite employment of specific mold coatings or linings which may be disclosed to be lubricants or antistick agents.
SEE OR SEARCH CLASS
65, Glass Manufacturing,
27, for processes including cleaning of apparatus employed in glass working.
134, Cleaning and Liquid Contact With Solids, appropriate subclasses for cleaning of a mold, per se.
162, Paper Making and Fiber Liberation,
199+, for processes in papermakng which include an apparatus conditioning or preparing step. 164, Metal Founding,
121, for preconditioning processes for metal casting apparatus and subclass 158 for apparatus of that class with cleaning means.
