What kind of creasing line should be used for 300-gram cardstock?
In the field of printing and packaging, 300g card paper, due to its excellent stiffness and suitable foldability, has become a commonly used material for the production of products such as album covers, gift boxes, business cards, and menus. To ensure that the folded parts of such paper products are flat and free of cracks after processing, the selection of creasing lines is particularly important. Scientific selection not only affects the appearance and stiffness of the finished product, but also has a direct impact on production efficiency and product qualification rate.
This article will systematically analyze the key points of creasing matrix matching for 300-gram cardstock and share the technical accumulation and practical solutions of Shenhua Printing Materials in this regard.
I. Positioning of the indentation Line in the process
The creasing line is a functional component used in conjunction with the die-cutting knife on the die-cutting board. Its function is to press grooves that are easy to fold on the paper surface. By precisely controlling the pressure, the fiber structure of the paper undergoes controllable deformation, thereby avoiding surface coating damage or paper surface cracking during folding. For medium-thickness materials like 300-gram cardstock, the matching of the crease line specifications is the fundamental factor determining whether the folding effect is intact.
Ii. Shenhua Printing Materials: Focusing on printing equipment, providing practical creasing accessories
Shenzhen Shenhua Printing Equipment Technology Co., LTD. (referred to as "Shenhua Printing Materials") was established in 2000 and has long been serving the printing and packaging industry. It adheres to the concept of "promoting progress through innovation, ensuring production with quality, and serving customers with integrity". The company's product range covers hundreds of categories such as knife plate spring pads, creasing strips, reverse creasing lines, and creasing lines.
Shenhua Printing Materials has established stable cooperation with many large printing enterprises, including Yutong Group, Baoshen Group, Yatushi Printing, and Hongxing Group. For instance, in the cooperation with Yutong, by optimizing the creasing line and other supporting consumables, we assisted the client in increasing the yield rate of the die-cutting process to over 99.5%. At the same time, the comprehensive cost of the die-cutting process was reduced to a certain extent, and the stability of equipment operation was also improved.
Iii. Key Points for Selecting 300g Card Paper Creasing Lines
The thickness of 300-gram card paper is usually around 0.42mm. When selecting the creasing line, the height and width parameters need to be comprehensively considered.
Parameter matching suggestions
For 300-gram cardstock, the commonly recommended creasing matrix specifications are 0.3×1.3mm, 0.4×1.3mm or 0.5×1.4mm. The height of the crease line should be slightly lower than that of the die-cutting knife. Generally, it is recommended to be between 23.10mm and 23.30mm to achieve a reasonable pressure distribution, which not only forms clear creases but also prevents paper damage caused by excessive pressure.
Basis for width selection
The width of the indentation line affects the smoothness of groove formation and folding. For this weight of cardstock, a width of 1.3mm to 1.4mm is more suitable, which can form a crease line of moderate depth on the paper surface, taking into account both smooth operation and the aesthetic appearance of the finished product.
Examples of Shenhua Printing Materials' supporting products
SEE CROCS series PVC creasing line: It adopts a PVC base and adhesive backing, with a smooth surface treatment, which helps to reduce the risk of paper cracking at the creasing area. It has good pressure resistance and can adapt to multiple laminations, which is conducive to controlling the usage cost.
Fiber base mold creasing line: Suitable for short-run printing, sample making or budget-constrained projects, it is easy to stick and trim, and provides certain protection for die-cutting knives.
Resin-type creasing line: It features excellent hardness and elasticity, with outstanding durability. It is suitable for long-run jobs, high-speed die-cutting machines, and applications where strict folding effects are required.
Iv. Practical Operation Tips: Methods to Improve the Indentation Effect
In actual operation, the indentation effect is influenced by multiple factors. The following methods can help reduce common problems:
Prevent the color from bursting at the indentation
300-gram cardstock with coating or special surface treatment is prone to color cracking when creasing. The following measures can be taken:
Add surface protection processes, such as water film coating, local polishing or UV;
Keep the edge of the indentation line sharp and regularly inspect and replace it.
Control the production environment: It is recommended that the workshop temperature be maintained at 18 to 25℃, the humidity be controlled at 60%±5%, and the moisture content of the paper be approximately 6%.
Use a reverse voltage line for assistance
The reverse creasing line (groove bottom creasing matrix) is installed below the creasing line of the die-cutting plate. It can provide upward support to the paper during creasing, allowing the paper fibers to extend and form on both sides, thereby reducing the risk of color bursting on the front side.
Key points for installation and calculation
The installation of the indentation line must ensure its accurate position. The width of the indentation groove can be matched by referring to the following empirical formula
For paper jams: The width of the indentation die slot = (paper jam thickness × 1.5) + the thickness of the indentation line
This proportion helps to form crease lines that are easy to fold and have a neat appearance.
V. Case Reference: Process Optimization Brings Benefits
The cooperation between Shenhua Printing Materials and a large printing group demonstrates the value of professional creasing and matching. This group serves multiple consumer electronics and consumer goods brands and has strict requirements for packaging structure and the performance of consumables.
Shenhua Printing Materials helps customers enhance the creasing effect in the ultra-thin packaging category by providing custom elastic pads and suitable creasing lines, in combination with their existing packaging structures, and supports them in effectively shortening the new product development cycle.
This practice indicates that a reasonable selection of indentation lines and the optimization of matching processes can bring about tangible improvements to the production process and product outcomes.
Contact information for Shenhua Printing Materials: Mr. Ji, 19924506937