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Những điều cần chú ý khi sử dụng công nghệ in offset

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by Tin tức

Công nghệ in offset ngày càng trở nên phổ biến, tuy nhiên để có sản phẩm in offset đẹp mà vẫn đảm bảo tiết kiệm chi phí các nhà in cần chú ý những điều gì? Bài viết dưới đây của Công ty in Phú Sỹ sẽ cho bạn câu trả lời, cùng đọc và tham khảo nhé!

Dàn máy in offset

Những điều cần chú ý khi sử dụng công nghệ in offset
1. Hệ màu sắc trong công nghệ in offset là gì?
Màu trong in Opset là hệ màu CMYK, ta có thể hiểu khái quát rằng tất cả các màu sắc đều có thể pha được từ 4 mầu CMYK này, ví dụ màu đỏ cờ là sự kết hợp từ màu Y (Yellow/vàng) và màu M (Magenta/hồng); Hay màu Xanh Blue (xanh tím) là sự kết hợp của hai màu C (Cyan/xanh nhạt) và M (Magenta/hồng); Rồi còn các màu được kết hợp từ 3 trong 4 màu nói trên hay kết hợp của cả 4 màu với nhiều thông số khác nhau sẽ đạt được nhiều kết quả màu sắc khác nhau.

2. Tiêu chuẩn đánh giá chất lượng in offset
Tiêu chuẩn quan trọng nhất để đánh giá chất lượng (tờ) in offset đó là tờ in ra phải giống mẫu (hoặc tờ in thử) về màu sắc và các tờ in phải đều màu (không dao động màu) trong toàn bộ sản lượng in.
Trong thực tế khách hàng thường phàn nàn là sản phẩm in ra không giống màu mẫu và các tờ in không đều.

Công nghệ in offset

3. Những yếu tố ảnh hưởng đến màu sắc tờ in offset
Những yếu tố quan trọng nhất trong quá trình in ảnh hưởng đến màu sắc tờ in (và do đó đến chất lượng in) đó là:
• Độ dày lớp mực trên giấy (tỉ lệ với Mật độ tông nguyên DV khi đo bằng Mật độ kế)
• Độ lớn điểm tram và Độ chồng mực (gắn chặt với thứ tự in chồng màu).
Để đánh giá ảnh hưởng của những yếu tố này, bên cạnh việc quan sát bằng mắt, người ta phải sử dụng dụng cụ đo để có sự đáng giá khách quan, loại bỏ ảo giác chủ quan. Dụng cụ thông dụng nhất là Mật độ kế.

4. Chú ý thứ tự in chồng màu
Trong công nghệ in offset, các thợ in phải đặc biệt chú trọng đến thứ tự chồng màu để có thể tạo ra một bản in đúng mẫu. Vì yếu tố này ảnh hưởng trực tiếp đến độ nhận mực, thông thường có sự khác biệt khi in màu đó lên giấy trắng hoặc in lên giấy đã được in màu trước.
Thứ tự in chồng màu ảnh hưởng đến độ nhận mực và do vậy ảnh hưởng đến màu in ra. Có sự khác biệt khi in một màu lên giấy trắng, in màu đó lên một lớp mực in trước đã khổ, hoặc in 2 hay 4 màu in ướt – chồng – ướt. Khi in ướt – chồng – khô (tức là in nhiều màu trên một máy một màu) và ướt – chồng – ướt, độ nhận mực có độ khác biệt ảnh hưởng đến kết quả in, đặt biệc đôi với ướt – chồng – ướt thì độ tách dính (tack) của mực in có vai trò rất quan trọng, nó phài giảm dần từ đơn vị đầu đến đơn vị cuối.
Thứ tự in chồng màu tiêu chuẩn được sử dụng phố biến ở các nước Châu Âu là:
• In 4 màu ướt – chồng – ướt (máy nhiều màu)
Đen – Xanh – Đỏ magenta – Vàng.
• In 2 màu ướt – chồng – ướt và ướt – chồng – khô:
Xanh cyan – Đỏ magenta -> Đen – Vàng
• In 1 màu ướt – chồng – khô:
Xanh cyan -> Đỏ magenta -> Vàng -> Đen.

Ở nước ta hiện nay, điều kiện sản xuất ở các xí nghiệp in cò nhiều khác biệt, đặt biệt là chúng ta sử dụng nhiều loại mực in nhập từ nhiều nước khác nhau đến chưa thể có tiêu chuẩn quốc gia thống nhất. Hậu quả của việc đánh giá chất lượng in phụ thuộc chủ quan của người thợ, mỗi xí nghiệp và việc tranh cãi là tất nhiên, đặc biệt là về ảnh hưởng đến kết quả in của thứ tự in chồng màu.

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