▎ 摘　　要

NOVELTY - Selective printing of absorber and β -nucleating agent and/or inhibitor onto polyolefin powder layer involves using a print and fuse machines such as multi jet fusion and hand stamping system for pouches (HSS) machine, and a laser sintering apparatus by powder bed fusion. The β -nucleating agent is e.g. one or more of organic pigment e.g. quinacridone (e.g. linear trans-quinacridone) or phthalocyanine, metal salts of hexahydrophthalic acid, aluminum salt of 6-quinazirin sulfonic acid, disodium salt o-phthalic acid, isophthalic and terephthalic acid, graphene oxide, multi-walled carbon nanotube-supported nucleating agent, substituted 1,3,5-benzenetrisamide, polystyrene and styreneacrylonitrile copolymer, N-N'-dicyclohexyl 2-6-naphthalene dicarboximide, 0.03-1 wt.% calcium tetrahydrophthalate, 0.1 wt.% potassium 7-oxabicyclo(2.2.1)hept-5-ene-2,3-dicarboxylate, polydopamine, N,N'-dicyclohexylsebacoylamide, N,N'-dicyclohexyl-therephthalamide, and N,N'-dicyclohexyldicarboxamide. USE - Selective printing of absorber and β -nucleating agent and/or inhibitor onto polyolefin powder layer used for automotive application, construction and home appliance. ADVANTAGE - The method produces printed polyolefin powder layer which controls thermal energy due to absorber density, e.g. thermal hot spots and thermal bleed, and controls β crystallinity by nucleating agent. The combination of uniform thermal energy with uniform nucleating agent achieves a uniform ductility across the component cross-section. DETAILED DESCRIPTION - Selective printing of absorber and β -nucleating agent and/or inhibitor onto polyolefin powder layer involves using a print and fuse machines such as multi jet fusion and hand stamping system for pouches (HSS) machine, and a laser sintering apparatus by powder bed fusion. The β -nucleating agent is one or more of organic pigment e.g. quinacridone (e.g. linear trans-quinacridone) or phthalocyanine, metal salts of hexahydrophthalic acid, aluminum salt of 6-quinazirin sulfonic acid, disodium salt o-phthalic acid, isophthalic and terephthalic acid, graphene oxide, multi-walled carbon nanotube-supported nucleating agent, substituted 1,3,5-benzenetrisamide, polystyrene and styreneacrylonitrile copolymer, N-N'-dicyclohexyl 2-6-naphthalene dicarboximide, 0.03-1 wt.% calcium tetrahydrophthalate, 0.1 wt.% potassium 7-oxabicyclo(2.2.1)hept-5-ene-2,3-dicarboxylate, N,N'-dicyclohexylsuberoylamide, polydopamine, N,N'-dicyclohexylsebacoylamide, N,N'-dicyclohexyl-therephthalamide, N,N'-dicyclohexyldicarboxamide, hydrazide derivative e.g. tetramethylenedicarboxylic di-(2-hydroxybenzohydrazide), and a two-component mixture of dibasic acid (e.g. pimelic acid, azelaic acid, o-phthalic acid, terephthalic acid and isophthalic acid) with oxide, hydroxide or acid salt of group II metal (e.g. compounds comprising magnesium, calcium, strontium or barium, such as calcium carbonate or other carbonates). The beta nucleating agent solid concentration when in the powder is 0.001-5 wt.%, were well-known nucleating agents such as sodium benzoate and sorbitol derivatives assist in the formation of α crystallites only. An inhibitor of the β crystalline phase in polypropylene is one or more of carbon nanoparticles, e.g. nanotubes or carbon nanofibers, lithium benzoate, sodium 2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate, metal carboxylate salts (e.g. 3-diisobutylcarbamoyl-bicyclo(2,2,1)heptane-2-carboxylic acid), and sorbitol derivative (e.g. 1,3,2,4-di(3,4-dimethylbenzylidene)sorbitol). The polyolefin powder is one or more of random or block copolymer of any combination of polypropylene, polyethylene, polyisobutylene, and polymethylpentene in a homo- or copolymer form, a copolymer of polyolefin and non-polyolefin, or a blended mixture of polyolefin such as polypropylene with other polyolefin and/or non-polyolefin polymer.