Bao Bì Nhựa PET – Sản phẩm được sử dụng nhiều trong ngành thực phẩm

Bao bì nhựa PET là một trong số những loại bao bì nhựa được sử dụng phổ biến trong các ngành công nghiệp hiện nay, đặc biệt là ngành thực phẩm. Tiêu biểu có thể kể đến như chai nước khoáng, nước ngọt,…

Bao bì nhựa PET ra đời nhằm đáp ứng nhu cầu chứa đựng sản phẩm, bảo quản sản phẩm trong quá trình vận chuyển hay lưu trữ. Với nhiều ưu điểm trong việc lưu trữ và bảo quản vật dụng, nên bao bì nhựa dạng PET được khá nhiều khách hàng tin dùng trong thời điểm hiện nay.

Hiện nay có khá nhiều loại bao bì nhựa được sử dụng trên thị trường bao bì việt nam, trong đó có các loại như bao bì nhựa PP, PVC,… Tiêu biểu được dùng nhiều trong ngành thực phẩm nhất là bao bì nhựa PET. Vậy bao bì nhựa PET là gì? Tại sao lại được mọi người tin dùng đến như vậy, hãy tìm hiểu qua bài viết sau đây.

bao-bi-PET-khong-gay-phan-ung-hoa-hoc-khi-tiep-xuc-voi-thuc-pham

                                                                       Bao bì PET không gây phản ứng hóa học khi tiếp xúc với thực phẩm

Tổng quan về bao bì nhựa PET

Để hiểu rõ hơn về loại bao bì PET này, trước tiên chúng ta nên đi tìm hiểu rõ hơn về loại vật liệu cấu thành nên chúng. Nhựa PET là gì? Đây là loại nhựa nhiệt dẻo tên là Polyethylene terephthalate (có thể được gọi là PET, PETE, PETP hoặc PET-P).

Thường được dùng trong tổng hợp sợi xô, vật đựng đồ ăn nước uống, các loại chất lỏng, ngoài ra còn có thể ép phun tạo hình, trong kỹ nghệ thì kết hợp được với xơ thủy tinh.

Bao bì PET là bao bì được làm từ loại nhựa nhiệt dẻo thuộc loại nhựa Polyester thường được dùng chai lọ, hộp đựng thức ăn, có thể tạo màng, phun để tạo hình. Vì được làm từ loại nhựa PET nên loại bao bì này có hầu như đầy đủ những đặc tính của dòng nhựa PET.

Những đặc tính kỹ thuật của bao bì PET

Bao bì mang tính trong suốt, hơi có ánh mờ, có bề mặt bóng láng mềm dẻo và bán tinh thể. Ngoài ra sản phẩm còn có độ bền cơ học cao, chịu được va đập vật lý, chống mài mòn tốt, có độ cứng nhất định nhưng rất nhẹ, dễ dàng sử dụng.

Điều quan trọng làm nên tên tuổi của loại bao bì nhựa này chính là việc không gây phản ứng hóa học khi tiếp xúc với thực phẩm, đây là yếu tố giúp sản phẩm có được chỗ đứng trong ngành công nghiệp thực phẩm như hiện nay.

Chống thấm nước và hơi nước cực kì tốt. Chống thấm khí O2, CO2 và dầu mỡ kém. Khi gia nhiệt sản phẩm đến 200℃ hoặc làm lạnh ở -90℃, cấu trúc hóa học của mạch PET vẫn được giữ nguyên tính chất chống thấm khí hơi và vẫn không thay đổi khi nhiệt độ ở 100℃.

Ứng dụng của bao bì PET

Do đặc tính chống thấm rất cao nên PET thường được dùng làm chai, bình đựng nước tinh khiết, nước giải khát có gas. Ngoài ra, trong sản xuất nhựa định hình, PET cũng được sử dụng rộng rãi trong sản xuất khay nhựa đựng thực phẩm nhờ vào tính thấm khí và an toàn khi ở nhiệt độ cao.

bao-bi-PET-san-pham-thong-dung-trong-nganh-thuc-pham

                                                                  Bao bì PET được dùng nhiều trong Ngành thực phẩm, đồ uống

Ưu điểm của bao bì nhựa loại PET

Nhờ những đặc tính cấu tạo như trên, bao bì PET có khá nhiều công dụng hữu ích như sau:

  • Cứng chắc, chống va đập mạnh, nhẹ và có độ bền cao nhờ hạt nhựa PET.
  • Có khả năng chống thấm tốt.
  • Có khả năng chịu nhiệt cao, lên đến 200℃.
  • Đảm bảo an toàn sức khỏe cho người sử dụng.
  • Có nhiều loại mẫu mã đa dạng, phù hợp với thị hiếu của người tiêu dùng.
  • Bề mặt sản phẩm mềm mại, láng bóng, cực kỳ thuận tiện cho việc in hình logo, nhãn mác.

Nhược điểm của PET

  • Có khả năng chống thấm khí O2, N2, CO2 và dầu mỡ cực kì kém.
  • Sản phẩm dễ bị hỏng khi tiếp xúc với tinh dầu thơm hoặc chất tẩy như Ancol, Axeton, H2O2,…
  • Bên cạnh đó, bao bì nhựa PET có thể hấp thụ mùi thực phẩm trong bao bì, điều này là một điểm trừ cực lớn của sản phẩm, làm mất cảm quan và giá trị của sản phẩm.

Lưu ý khi sử dụng nhựa PET

Dù sản phẩm mang nhiều ưu điểm, nhưng để đảm bảo an toàn cho mọi người khi sử dụng loại bao bì nhựa này, vẫn cần phải tuân theo những quy định sau đây, để có thể sử dụng được hoàn toàn 100% khả năng của loại bao bì này.

Trước tiên với vỏ chai PET, đây không phải là loại nhựa tốt để tái sử dụng làm vật chứa nước hay chứa thực phẩm. Chỉ nên sử dụng trong một khoảng thời gian ngắn, trên dưới 10 ngày là ổn. Sau đó thì cần phải thay ngay chai mới vì hàm lượng acetaldehyde, formaldehyde và tổng antimony tăng không đáng kể trong vòng 10 ngày đó.

Tuyệt đối không sử dụng nhựa PET để đựng các thực phẩm nóng hay cho vào lò vi sóng. Nhựa PET chỉ bền ở nhiệt độ thường và đông lạnh. Nếu nhiệt độ tăng quá cao, sẽ dẫn đến thôi nhiễm antimony – đây là hợp chất gây ung thư và đột biến.

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