●기본정보
 ◇ 파우치 필름은 2종류 이상의 합지로 제작된다. 필름별 각각의 특성이 다르기 때문이다.
 ◇ 합지는 2중지, 3중지, 4중지의 3종이 있으나 특별한 경우를 제외하고는 2중지는 잘 사용되지 않는다.
 ◇ 보다 안전하고 후살균 및 냉장보관이 가능한 4중지(PET/NY/AL /LLDPE)를 강추합니다.

●특징
  <합지별 필름을 간단하게 권하면 다음과 같다.>
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❶ 2중지 :
• OPP+CPP
• OPP+LLDPE
• PET+CPP
• PET+LLDPE
• NY+CPP
• NY+LLDPE
LLDPE : 통상적으로 PE로 약칭
·······································································

❷ 3중지 : 
• OPP+VMCPP+CPP
• OPP+VMCPP+LLDPE
• PET+VMPET+CPP
• PET+AL+CPP
• PET+VMPET+LLDPE
• PET+AL+LLDPE
• NY+VMCPP+CPP
• NY+VMCPP+LLDPE 
• NY+AL+CPP
• NY+AL+LLDPE
• PET+NY+LLDPE
·······································································

❸ 4중지 : 
• PET+NY+VMPET+CPP
• PET+NY+AL+CPP
• PET+NY+VMPET+LLDPE
• PET+NY+AL+LLDPE
·······································································
◆ 고온 살균(120℃이상) 등 특수한 경우에만 사용되는 CPP는 단가가 비싼 편이어서 거의 사용 안함