PRODUCTION METHOD OF SYNTHETIC RESIN CONTAINER AND MOLDING DIE

• Main Authors: KIYOTO HIROMITSU, SHIBATA SEISHI, FUJIOKA HITOSHI, MONZEN HIDETO, MIYAZAKI YUICHI
• Format: Patent
• Language: English; Japanese
• Published: 20.12.2022
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

To provide a synthetic resin container with a peelably-laminated coating layer without causing appearance defects.SOLUTION: In blow molding by setting, in a molding die 100, a preform 10 that comprises a bottomed cylindrically-formed preform body 10a containing a mouth forming region 20 and a stretched region 30 and comprises a covering material layer 60 peelably-laminated on an outer circumferential surface side of the preform body 10a, the molding die 100 is designed so that a clearance CL2 between a thermally expanded portion of the covering material layer 60 and a cavity surface 101 of the molding die 100 is larger by selectively heating the stretched region 30 of the preform 10 than a clearance CL1 between a lower end of the mouth forming region 20 of the preform 10 set in the molding die 100 and a lower neck regulating portion 102 provided in the molding die 100.SELECTED DRAWING: Figure 8 【課題】外観不良を生じることなく、剥離可能に積層された被覆層を備える合成樹脂製容器を製造する。【解決手段】口部形成領域２０と、延伸領域３０とを含む有底筒状に成形されたプリフォーム本体１０ａと、プリフォーム本体１０ａの外周面側に剥離可能に積層された被覆材層６０とを備えるプリフォーム１０を成形型１００にセットしてブロー成形するに際し、成形型１００にセットされたプリフォーム１０の口部形成領域２０の下端側と、成形型１００に設けられた首下規制部１０２との間のクリアランスＣＬ１に対して、プリフォーム１０の延伸領域３０を選択的に加熱することにより被覆材層６０が熱膨張した部分と、成形型１００のキャビティ面１０１との間のクリアランスＣＬ２が大きくなるように成形型１００を設計する。【選択図】 図８