A purging agent that has excellent purging performance without generation of aggregate is disclosed as a purging agent used in a purging operation where a resin to be processed contains a polar group-containing thermoplastic resin. This purging agent contain a hydrocarbon-based resin, and at least one metal salt among an alkaline metal salt and alkaline earth metal salt, has a water content of 0.15% by weight or less, and includes 0.1 to 20% by weight of the metal salt expressed as the metal relative to the hydrocarbon-based resin.

A maintenance station for casting molds is provided with a handling device on which a spraying device is disposed. The spraying device sprays a cleaning medium onto a surface of at least one casting mold. The cleaning medium is a mixture of compressed air and abrasive particles. A maintenance method for the casting mold in the maintenance station is also provided.

A cleaning agent composition contains 100 parts by weight of polyethylene oxide; 25 parts by weight to 90 parts by weight of at least one type of fatty acid ester that is selected from glycerin fatty acid ester, polyglycerin fatty acid ester, or sorbitan fatty acid ester; and 15 parts by weight to 45 parts by weight of a metal salt of a fatty acid and/or a hydroxyfatty acid. The cleaning agent composition is used for cleaning a flow channel for resin in a hot runner type mold.

Provided is a cleaning agent composition that is capable of efficiently performing the substitution of a molding raw material in a hot runner type mold. The cleaning agent composition contains 100 parts by weight of a thermoplastic resin; 1 part by weight to 20 parts by weight of at least one type of fatty acid ester that is selected from glycerin fatty acid ester, polyglycerin fatty acid ester, or sorbitan fatty acid ester; and 1 part by weight to 15 parts by weight of a metal salt of a fatty acid and/or a hydroxyfatty acid. The cleaning agent composition is used for cleaning a flow channel for resin in a hot runner type mold.

To provide a thermoplastic resin composition having an enhanced cleaning performance for cleaning a molding processing machine. The thermoplastic resin composition for cleaning a molding processing machine contains (A) an olefin-based resin, and (B) (B1) a nonionic surfactant having an HLB of 13 to 20, wherein the composition contains component (B) in an amount of 0.5 to 10 parts by mass relative to 100 parts by mass of component (A).

A nonflammable solvent composition comprises a nonflammable solvent and optionally, an additive composition. The nonflammable solvent comprises: about 90.0 wt. % to about 99.99 wt. % of trans-1,2-dichloroethylene; and about 0.01 wt. % to less than about 10.0 wt. % of one or more of (E)-1-chloro-2,3,3-trifluoroprop-1-ene and (Z)-1-chloro-2,3,3-trifluoroprop-1-ene, based on the total weight of trans-1,2-dichloroethylene, (E)-1-chloro-2,3,3-trifluoroprop-1-ene, and (Z)-1-chloro-2,3,3-trifluoroprop-1-ene. The nonflammable solvent composition has no fire point as determined by flammability testing compliant with any one or more of ASTM D92 or ASTM D1310.

A nonflammable solvent composition comprises, based on the total weight of trans-1,2-dichloroethylene, (E)-1-chloro-2,3,3-trifluoroprop-1-ene, and (Z)-1-chloro-2,3,3-trifluoroprop-1-ene: about 80 wt. % to about 99.99 wt. % of trans-1,2-dichloroethylene; and about 0.01 wt. % to about 20 wt. % of at least one of (E)-1-chloro-2,3,3-trifluoroprop-1-ene or (Z)-1-chloro-2,3,3-trifluoroprop-1-ene; wherein the nonflammable solvent composition has no fire point over a temperature range of 10 C. to the boiling point of the solvent composition, measured according to any one or more of ASTM D92-18, ASTM D1310-14, or ASTM D56-22. Methods for preparing a nonflammable solvent composition from trans-1,2-dichloroethylene and for increasing the fire point of trans-1,2-dichloroethylene comprises mixing the trans-1,2-dichloroethylene with about 0.01 wt. % to about 20 wt. % of at least one of (E)-1-chloro-2,3,3-trifluoroprop-1-ene or (Z)-1-chloro-2,3,3-trifluoroprop-1-ene to form a nonflammable solvent composition having no fire point over a temperature range of 10 C. to the boiling point of the solvent composition.

A resin composition for cleaning molding machines that achieves both high cleaning power for the material mold-processed before cleaning and easy replacement to the material to be mold-processed after cleaning, improves stable raw material feedability, has metered purging suitability, and has improved workability by suppressing spurt and emission of fume from a molding machine during the cleaning process is provided. To achieve the object, the present disclosure is a resin composition for cleaning molding machines including a thermoplastic resin (A), a synthetic wax (B), and a polyolefin-based resin (C), wherein an absolute value of a difference between solubility parameters of (A) and (B) is 2.0 (cal/cm.sup.3).sup.1/2 or more and 7.0 (cal/cm.sup.3).sup.1/2 or less, a compounding amount of (C) is more than 0.1 mass % and less than 10 mass %, and a glass transition temperature of (C) is higher than 150 C. and lower than 40 C.