Books binding materials - book shell materials and cover fabrics (2)

Second, the cover fabric

There are various kinds of fabrics used to make plain and hardcover covers, which can be roughly divided into paper fabrics, coated fabrics, fabric fabrics, and non-fabric fabrics.

1. Paper fabrics. The most used book covers in China are paper covers. The cover materials for paperback, saddle-stitched bookcases and hardcover bookcases are paper-based fabrics. The commonly used paper fabrics include book cover paper, white paperboard, pattern paper, and offset paper.

(1) Book paper. The cover paper is commonly known as the cover paper. It is a kind of printing paper used for making paperback books, magazines, books, and other covers. It is divided into A, B, and C according to quality and purpose.

The cover paper is flat paper with paper size of 880mm x 1230mm and 780mm x 1092mm. There are also roll papers and various color and embossed book covers.

According to the provisions of QB1454-92, the basis weight of the book paper is 80g/m2, 100g/m2, and 120g/m2. Its main technical indicators are shown in Table 8-2.

Table 8-2 Technical specifications of the cover sheet

Indicator Name Unit Specification
ABC
Whiteness (not less than) % 80 75 70
Sizing (not less than) mm 1.25 1.0 0.75
Splitting length (vertical and horizontal average) not less than 80g/m2 m 2900 2600 2400
100, 120g/m2 2900 2400 2200
Folding resistance (lateral) not less than 80g/m2
Times 15 10 8
100, 120g/m2 20 15 12
Smoothness (Front) General pressure (not less than)
s 30 25 25
Overpressure (not less than) 120 120 120
Positive contrast (not more than) % 30 35 35

(2) White cardboard. White paperboard is a high-quantity, thicker paper that is used to print business cards, cover books, and can also be used as a back-up paper for hardcover books.

White cardboard is lithographic paper with a paper size of 787mm x 1092mm. White cardboard is divided into special number, number one, number two. There are five kinds of 200g/m2, 220g/m2, 250g/m2, 260g/m2 and 300g/m2. According to the regulations of QB212-80, the main technical specifications of white cardboard are shown in Table 8-3.
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Table 8-3 Technical Specifications of White Cardboard

Index Name Unit No. 1 No. 2 Tightness (not less than) g/m2 0.85 0.80 0.75
Whiteness (not less than) % 92.0 87.0 82.0
Sizing degree (not less than) mm 1.5 1.0 1.0
Smoothness (no less than positive and negative sides) 200～260g/m2
s 35 30 25
300g/m2 25 20 15
Moisture% 6±12 6±12 6±12
(3) pattern paper. Pattern paper is based on thick paper as the substrate, the paper made by dipping or one-side coating embossing. The pattern has a uniform color, crisp paper, and a wide variety of colors. It has good bonding and hot stamping properties. Pattern paper can be used for plain packaging, hardcover cover materials, ring linings, business cards, greeting cards, etc. It is currently a more suitable and popular cover material.

(4) Offset paper. Offset paper is a common cover material for flat and saddle stitching (sometimes the same as coated paper), and it is also the main material for hard cover book cover. Offset paper has good adhesive properties. According to the thickness of the book, the cover paper has a basis weight of 40 to 200 g/m2.

(5) The line book cover material. Paper for bookbinding covers is generally made from burrs of the same color as the book block or blue-tinted paper. More exquisite use of paper. Base cloth, paint paper, PVC cover paper, etc.

(6) Composite processed paper. Composite paper is a combination of two or more substrates that are the same or different.

The compound-processed paper used as a book-laying fabric is mainly coated with a dry layer and is a cover material made of polyvinyl chloride film on a paper base (printed matter). The surface of the composite processed paper is wear-resistant, has a good luster, is moisture-proof and is not easily soiled, and plays a role of protecting the cover of the book and beautifying the books. This material is often used as a cover material for elementary school textbooks and general paperback and hardcover books. (to be continued)