Printing materials - base paper

1. Raw paper classification

1.1: Corrugating medium

National standards are divided into four types: A, B, C, and D. D-grade corrugated paper is basically eliminated by the market, and few manufacturers purchase and use it.

1.2: Linerboard

1.2.1: Kraft cardboard (American and Russian). Features: Long fiber, heavy adhesive, high physical strength, rough cardboard; Pure wood pulp or a small amount of OCC. Abbreviation: Imported Beef Card.

1.2.2: Imitation kraft paper. Features: 15-25% wood pulp hanging on the surface, the rest is OCC; The fibers are shorter and have lower strength than kraft paper. The paper surface is flat, with varying degrees of glue application (water absorption ranging from 30-55g/m2) and surface dyeing treatment. Abbreviation: Domestic Cow Card.

1.2.3: White cardboard. White faced cow base, bleached wood pulp on the surface, and the rest are natural or dyed wood pulp. (Russian white card, Swedish white card, Finnish white card); Whiteboard paper (surface bleached wood pulp, the rest is de inked or non de inked waste paper); Coating whiteboard paper (white background, white gray background, ---).

1.2.4: Recycled paper. All composed of OCC, but different from corrugated paper. The surface is coated with 11 # or above AOC and has undergone dyeing treatment. The market is generally referred to as C-grade cardboard, and some are called T-paper.

2. Basic properties of cardboard base paper.

2.1: Physical indicators: Quantification, moisture content, tightness, burst strength (burst index), cyclic compression strength (cyclic compression index), positive/negative water absorption, flexural strength.

2.2: Appearance indicators: smoothness, color difference, whiteness.

2.3: Specific raw paper standards refer to GB13023 (National Standard for Corrugated Paper) and GB13024 (National Standard for Box Board Paper). Refer to new industry trends or standards for related projects.

3. Basic production process of papermaking

3.1: Traditional paper-making process: Raw materials: wood or grass fibers.

3.2: Modern paper-making process: Raw materials: commercial wood pulp, waste paper.