Posted in Tin tức

Quy trình in offset

Bài viết dưới đây giới thiệu về quy trình in offset với 5 bước cơ bản.

Bước 1: Thiết kế chế bản:

Đầu tiên phải tạo ra đi tượng cần in trên máy tính. Ví dụ ta định in một tờ rơi khổ A4 để quảng cáo cho một Công ty Bán máy tính, trước hết ta phải chuẩn bị các tư liệu liên quan tới việc quảng cáo đó: hình ảnh máy vi tính và các thiết bị, địa chỉ, số điện thoại…., sau đó đưa lên máy tinh để xử lý và sắp xếp cho hài hoà và ấn tượng với sự phối hợp cả tư duy, kinh nghiệm của người thiết kế và dựa trên ý muốn của khách hàng…, hoàn thành xong phần thiết kế chế bản là tới phần outfilm…

in-an-offset

Bước 2: Output Film

Chế bản xong thì xuất để outfilm, đối với các tờ rơi có hình ảnh, Film sẽ được out thành bốn tấm đại diện cho bốn lớp mầu C (Cyan), M (Magenta), Y (Yellow), K (Black). Tới đây ta đề cập một chút về vấn đề mầu sắc trong in Opset:

Mầu trong in Opset là hệ mầu CMYK, ta có thể hiểu khái quát rằng tất cả các mầu sắc đều có thể pha được từ 4 mầu CMYK này, ví dụ mầu đỏ cờ là sự kết hợp từ mầu Y (Yellow/vàng) và mầu M (Magenta/hồng); Hay mầu Xanh Blue (xanh tím) là sự kết hợp của hai mầu C (Cyan/xanh nhạt) và M (Magenta/hồng); Rồi còn các mầu được kết hợp từ 3 trong 4 mầu nói trên hay kết hợp của cả 4 mầu với nhiều thông số khác nhau sẽ đạt được nhiều kết quả mầu sắc khác nhau.

Output 4 tấm phim xong thì chuyển sang phơi bản kẽm

Bước 3: Phơi bản kẽm:

Khi đã có 4 tấm phim, người ta đem phơi từng tấm một lên bản kẽm (hiểu một cách đơn giản hơn là đem chụp hình ảnh của từng tấm phim lên từng tấm bản kẽm bằng máy phơi kẽm), đến đây ta đã có trong tay 4 bản kẽm đại diện cho 4 mầu C, M, Y, K để bước sang phần in.

Bước 4: In Opset:

Người ta sẽ tiến hành in từng mầu một, in mầu gì trước, mầu gì sau không quan trọng hoặc tùy vào kinh nghiệm của người thợ in. Đầu tiên, người ta sẽ lựa chọn một trong 4 kẽm mầu đó để lắp lên quả lô máy in Opset, ở phần vào mực của máy người ta cũng sẽ cho loại mực tương ứng (ví dụ bản kẽm mầu C (Cyan) thì người ta cũng cho mực C và tiến hành in, Quả lô quay qua tờ giấy sẽ đập phần tử in xuống tờ giấy in, sau khi chạy xong hết số lượng định in, người ta tháo kẽm ra, vệ sinh hết mực cũ, lắp kẽm mới vào, ví dụ mầu vừa in xong là mầu C (cyan) thì giờ sẽ lắp kẽm Y (Yellow) vào, phần vào mực sẽ cho mực Y (vàng), cho giấy đã in một mầu kia vào và lại tiếp tục quy trình cũ…. Cứ thế tuần tự cho đến khi hết cả bốn mầu, bốn mầu đó chồng lên nhau sẽ cho ra bản in cuối cùng.Trong quá trình in như vậy, với mỗi màu, người ta sẽ phải chạy thử khoảng 50 bản cho màu thật ổn định. Tổng cộng cả quá trình vào khoảng 200 bản chạy thử. Chính vì vậy, khi in offset, người ta phải tính dư giấy ra khoảng 200 tờ in (gọi là bù hao giấy)

Bước 5: Gia công sau in:

Cán láng: Cán láng là cán lớp màng mỏng lên bề mặt của tờ rơi sau khi in, cán láng sẽ tạo ra cho tờ rơi sự mịn của giấy khiến cho hình ảnh cũng trở nên đẹp hơn.

Có 2 kiểu cán láng: cán mờ và cán bóng: Cán mờ sẽ tạo ra bề mặt mịn và mềm còn Cán bóng sẽ cho bề mặt bóng hẳn lên.

Cán láng chỉ là một trang sức sau khi in, không bắt buộc, khách hàng có thể lựa chọn hoặc không là tuỳ.

Xén: Thông thường khi in người ta sẽ để tờ giấy to (phù hợp với khổ máy) để in; Sau khi in xong sẽ sử dụng máy xén để xén thành phẩm.

VPGD Hà Nội: Số 37 ngõ 335 Nguyễn Trãi, Thanh Xuân, Hà Nội / Điện Thoại: 04 3 552 8847 - 04 66 838 405 / Hotline: 0986 988 645 - 097 819 02 27 / Email : oneneo.com@gmail.com / Skype : neoidea.adv / Website : www.neoidea.com.vn / www.inbienquangcao.vn

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