소개
(재가열) stretch blow molding machines 는 사출 성형된 폴리머 프리폼 을 중공 용기로 변환하는 데 사용되는 2단계 기계로, 주로 음료, 식품, 개인 위생 및 가정용 제품을 위한 PET 병 입니다. 재가열 공정에서는 프리폼을 먼저 냉각 및 보관한 후, 적외선 램프 또는 유사한 열 모듈을 통해 재가열한 다음, 몰드 내부에서 축 방향으로 연신하고 이축 방향으로 블로우하여 완성된 용기를 형성합니다.
이 기계 유형은 특히 정밀한 네크 마감, 우수한 배리어 성능, 강한 탑로드 또는 압력 저항이 요구되는 고투명도, 고강도, 경량 포장 과 밀접하게 연관되어 있습니다. 1단계 사출 스트레치 블로우 성형과 비교할 때, 재가열 방식은 프리폼 제작과 병 성형을 분리하여 생산 유연성, 높은 처리량, 전용 병 라인에서의 대규모 병 제조를 가능하게 합니다.
기술적으로, 재가열 스트레치 블로우 성형 시스템은 소형 반자동 장치부터 다중 캐비티, 고속 프리폼 이송, 구역별 적외선 가열, 온도 균일성 및 벽 두께 제어를 위한 공정 모니터링을 갖춘 대형 회전식 또는 선형 완전 자동 플랫폼까지 다양합니다. 이들은 PET 포장에서 특히 중요하며, 가열 제어, 에너지 효율, 비원형 용기를 위한 선택적 가열, 디지털 자동화 분야에서 지속적인 개발이 이루어지고 있습니다.
역사 및 개발
재가열 스트레치 블로우 성형 방식은 업계가 강도, 투명도 및 가스 배리어 성능을 향상시키는 이축 배향 의 장점을 인식한 후 PET 병 포장이 확대되면서 등장했습니다. 이 공정은 음료 브랜드가 기존 비스트레치 블로우 성형보다 더 나은 성능을 가진 가벼운 병을 요구하면서 특히 중요해졌습니다.
주요 이정표는 초기 스트레치 블로우 개념에서 분리된 2단계 생산 으로의 전환으로, 프리폼은 한 작업에서 사출 성형되고 나중에 전용 기계에서 병 성형을 위해 재가열됩니다. 이 구조는 프리폼 재고 관리, 중앙 집중식 프리폼 생산, 표준화된 프리폼의 원격 병입 공장으로의 글로벌 운송을 가능하게 했습니다.
또 다른 이정표는 적외선 가열 구역과 가열 및 블로우 스테이션 간의 제어된 이송을 사용하는 연속 동작 및 회전식 프리폼 재가열 시스템 의 채택이었습니다. 이는 온도 일관성과 사이클 안정성을 향상시켰으며, 이는 병 중량 감소와 네크/캐비티 정확도에 중요합니다.
추가 개발은 고속 다중 캐비티 시스템 과 개별 가열 구역 및 소규모 배치 유연성을 위한 빠른 교체 tooling 을 포함한 고급 가열 프로파일 제어로의 이동이었습니다. 이러한 개선은 일반 음료 포장과 핫필 병, 대용량 오일 용기, 리턴 가능 또는 히트셋 PET 형식과 같은 특수 용기 형상을 모두 지원합니다.
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