--- title: How Ink Influences Gloss in Flexo Printing for Custom Packaging Bags date: 2026-02-08T09:00:00Z modified: 2026-08-16T07:57:07Z permalink: "https://www.zp-flexopress.com/blog/buying-guide/flexo-ink-gloss-custom-packaging/" type: post status: publish excerpt: "" wpid: 987 categories: - buying-guide featured_image: "https://www.zp-flexopress.com/wp-content/uploads/2026/02/How-Ink-Influences-Gloss-in-Flexo-Printing-for-Custom-Packaging-Bags.webp" featured_image_alt: How Ink Influences Gloss in Flexo Printing for Custom Packaging Bags timestamp: 2026-08-16T07:57:07Z tags: - buying-guide --- ## Quick Answer Gloss in flexo-printed bags depends mainly on ink film thickness, flow, leveling, and pigment content. Thicker films retain more binder, boosting gloss. On coated paperboard, gloss plateaus at about 3.8 microns. High pigment content forms a fine capillary network, increasing gloss intrinsically. Proper leveling prevents streaks. RAZP, a trusted manufacturer of CI and Stack flexo printing machines, builds equipment that supports precise control of these variables for consistent, high-gloss output. In flexographic printing, the gloss of printed bags—such as fast food paper bags, takeout paper bags, and bakery paper bags—is primarily influenced by the smoothness of the ink film. This depends on the properties and content of the binder. Ink used in [flexo printing machines](https://www.zp-flexopress.com/product-category/printing-machines/label-printing-machines/) should distribute finely and evenly, with sufficient viscosity and fast drying speed, to prevent excessive penetration into the pores of tea bags, candy paper bags, nut paper bags, and fruit paper bags. The ink must also have good ink flow property, forming a smooth film after printing. ## Ink Film Thickness After the paper absorbs the ink binder, the remaining binder in the ink film effectively increases gloss in printed items such as coffee bean bags, milk tea packaging bags, and wedding candy bags. Thicker films retain more binder, enhancing the gloss of bakery paper bags, burger bags, and fried chicken paper bags. Even using the same ink, gloss can vary depending on the bag’s material and the thickness of the ink film. ### High-Gloss Coated Paper On high-gloss coated paper, thinner films may reduce gloss for coffee packaging bags, flour paper bags, and seed paper bags. This is because the ink film can cover the paper’s inherent gloss, and the absorbed binder from the paper affects the overall shine. As the film thickness increases, the paper’s absorption saturates, leaving more binder on the surface, and gloss continues to improve. ### Coated Paperboard For [coated paperboard](https://www.zp-flexopress.com/wp-content/uploads/wp-mfa-exports/post/select-flexographic-printing-materials.md), increasing ink film thickness rapidly improves gloss. Once the film reaches about 3.8 microns, gloss plateaus and no longer increases significantly with thicker layers. ## Ink Flow Property The [ink flow property](https://www.zp-flexopress.com/wp-content/uploads/wp-mfa-exports/post/ink-surface-tension-guide-flexopress-label-printers.md) of flexo inks directly impacts the gloss of bags like custom printed resealable bags and printed plastic bags for food packaging. High flow can cause over-spreading, larger printed dots, and thinner ink layers, reducing gloss. Low flow can lead to uneven coverage. Achieving optimal flow is essential for consistently high gloss in printed custom paper carrier bags and other packaging. ## Ink Leveling Proper ink leveling ensures smooth films, providing high gloss for salt bags, dental sterilization bags, and medical sterile bags. Poor leveling can cause streaks, lowering gloss in products such as herbal medicine bags, shopping paper bags, and gift paper bags. ![](https://www.zp-flexopress.com/wp-content/uploads/2026/02/How-Ink-Influences-Gloss-in-Flexo-Printing-for-Custom-Packaging-Bags-1.webp) ## Pigment Content High-pigment ink retains more binder within the ink film, forming a fine capillary network. This increases gloss for custom poly plastic bags as well as T-shirt bags, apparel bags, shoe bags, luxury packaging, and supermarket bags. Unlike applying varnish to enhance gloss on perfume bags, cosmetic bags, or snack bags, adjusting pigment content achieves high gloss intrinsically. When pigment levels are limited due to color reproduction requirements in full-color printing, ink film thickness becomes crucial. Only with sufficiently thick custom printed packaging bags films can maximum gloss be achieved. Overloading pigment can scatter light and reduce gloss if not fully covered by the binder. Product Card – Flexo Label Printing Machine /\* — 产品卡片基础样式 — \*/ .product-card { display: flex; align-items: stretch; border: 1px solid #e0e0e0; border-radius: 8px; padding: 20px; margin: 20px 0; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); max-width: 900px; background-color: #ffffff; font-family: ‘Poppins’, sans-serif; } /\* 左侧图片 30% \*/ .product-card .card-image { flex: 0 0 30%; max-width: 30%; margin-right: 25px; display: flex; align-items: center; justify-content: center; } .product-card .card-image img { width: 100%; height: auto; max-height: 200px; display: block; border-radius: 4px; object-fit: contain; } /\* 右侧内容 70% \*/ .product-card .card-content { flex: 1 1 70%; width: 70%; display: flex; flex-direction: column; justify-content: center; } /\* 标题 \*/ .product-card .product-title { margin-top: 0; font-size: 1.4em; color: #222222; line-height: 1.2; margin-bottom: 12px; font-weight: 600; } /\* 参数描述排版 \*/ .product-card .product-description { font-size: 0.92em; color: #444444; margin: 0 0 20px 0; line-height: 1.6; } .product-card .product-description strong { color: #333; font-weight: 600; } /\* 按钮 – 主题色 #0E6EB8 \*/ .product-card .view-product-button { display: inline-block; padding: 10px 28px; background-color: #0E6EB8; color: #ffffff; text-decoration: none; border-radius: 4px; font-size: 1em; font-weight: 500; text-align: center; transition: all 0.3s ease; align-self: flex-start; box-shadow: 0 2px 4px rgba(14, 110, 184, 0.2); } /\* 按钮交互 – 交互色 #f8b62a \*/ .product-card .view-product-button:hover { background-color: #f8b62a; color: #ffffff; transform: translateY(-1px); box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15); } /\* 响应式调整 \*/ @media (max-width: 768px) { .product-card { flex-direction: column; text-align: center; padding: 15px; } .product-card .card-image { width: 100%; max-width: 280px; margin-right: 0; margin-bottom: 15px; margin-left: auto; margin-right: auto; } .product-card .card-content { width: 100%; } .product-card .view-product-button { align-self: center; } } ![](https://www.zp-flexopress.com/wp-content/uploads/2025/11/Satellite-Type-6-Color-Flexographic-Printing-Machine-250m-min-Water-based-Ink.webp) Satellite Type 6 Color Flexographic Printing Machine(250m/min) **Colours:** 4/6/8 Colors **Max. material width:** 850mm, 1050mm, 1250mm, 1450mm **Max. printing width:** 800mm, 1000mm, 1200mm, 1400mm **Printing length:** 340−1000mm **Printing speed:** 200m/min [ Learn More ](https://www.zp-flexopress.com/wp-content/uploads/wp-mfa-exports/product/satellite-type-6-color-flexographic-printing-machine250m-min-water-based-ink.md) ## Practical Applications Control over ink film thickness, flow, leveling, and pigment content ensures visually appealing stand up pouches custom printed, custom packaging poly mailers, and customized coffee bags. In food and specialty packaging, these factors make custom food packaging bags and customized coffee bags appear premium, while maintaining print quality and functional performance for bakery, beverage, and gift packaging. [Get a Quote](https://www.zp-flexopress.com/wp-content/uploads/wp-mfa-exports/page/contact.md)