Processing Technology,Design And Safety Properties Of Key Parts In Baijiu Packaging

Processing technology,design and safety properties of key parts(bottleneck,bottle cap and bottle stopper)in Baijiu Packaging.The main research contents and results were as follows:Bottleneck:Properties of various polyethylene glycol terephthalate(PET)materials were compared.The hygienic property,mechanical behavior,aging quality,materials synthesis,structure and processing technology of PET bottleneck were also explored.The results showed that PET material W681PET could be used for packaging alcoholic drinks with alcoholicity less than 95%.The optimum injection molding technology for bottleneck was 17s of cycle,273℃ of 2 zone temperature,300,of 4 zone temperature and 55mm of backward position.The toughness of bottleneck with PET raw material was better than that of AS raw material.WP56152 formula had better toughness.Thickening bottleneck bridge teeth,increasing R angle and wall thickness at corner could solve the fragile problem of PET material products.Changing the gate of PET bottleneck from top to side could avoid whitening of gateInner cap:The removal torque,tightness,melt index,environmental stress resistance and hygienic property of high density polyethylene(HDPE)material were studied.The structure of inner cap obtained from HDPE was improved.The results exhibited that value of removal torque of it was 0.95N.m,which met the standards.Melt index of various HDPE met the requirements of FDA(materials Melting index should not exceed 15g/10min).Formula of inner cover material was 85%HDPE C410B+15%LLDPE 2045G.The appropriate inner cap product was obtained after the continuous process including the drying of HDPE C410B and LLDPE 2045G,mixing,heating and melting,and injection mold forming.The sealing performance of inner cap with plastic bottleneck was good due to the increasing of wall thickness and R-angle and limiting of outer cover.Bottle stopper:The sealing performance,hexane evaporation residue,ultraviolet aging of bottle stopper with low-density polyethylene(LDPE)and polyolefin elastomer(POE)was analyzed.The formula of bottle stopper material,injection molding process and structure were optimized.The results exhibited that the bottle stoppers with both LDPE and POE materials had leakage and excess N-hexane evaporation residue which exceeded the standard.On this basis,Oil-free filled POE treated by microcrosslinking was synthetized,which was used to produce bottle stopper C20120409177.The evaporation residue of n-hexane of it was significantly reduced,which met the requirements of long-term exposure to alcohol.Bimaterial design(PE material used in wine bottle coordination and PP material used in the coordination with bottle cap connecting rod)avoided pull-out problems caused by insufficient material strength at the joint of inner plug and cap connecting rod.