How Do Paper Surface Treatments Change the Writing Experience of Sticky Notepads?
2026-10-16
A stationery buyer for an office supply chain tests three brands of Sticky Notepads. Brand A feels smooth and the ballpoint pen glides across the surface. Brand B feels rougher and the pen leaves a slightly uneven line. Brand C is very smooth, but the gel pen ink takes 8 seconds to dry and smears easily. The buyer sends all three samples to a paper lab for surface analysis. The results show that Brand A has a light surface sizing, Brand B has no sizing, and Brand C has a heavy coating. The surface treatment determines how the paper interacts with the ink, the pen, and the user. This guide explains the three main surface treatments and how they change the writing experience.
1. What Is Surface Sizing and How Does It Affect Ink Absorption?
Surface sizing is a treatment that applies a thin film of starch, polymer, or resin to the surface of the paper. The sizing fills the pores between the paper fibers and reduces the absorption rate of the ink. Without sizing, the ink is absorbed quickly into the paper, which can cause feathering and bleed-through. With sizing, the ink stays on the surface longer, which produces a sharper line and better color intensity. The table below shows the effect of sizing on ink absorption for different writing instruments.
| Sizing level | Ballpoint ink absorption | Gel ink absorption | Fountain pen ink absorption | Line sharpness |
| None | Fast (2 sec) | Very fast (1 sec) | Very fast (1 sec) | Poor (feathering) |
| Light | Moderate (5 sec) | Moderate (3 sec) | Fast (2 sec) | Good |
| Medium | Slow (10 sec) | Slow (6 sec) | Moderate (4 sec) | Very good |
| Heavy | Very slow (15 sec) | Very slow (10 sec) | Slow (8 sec) | Excellent |
In our factory, we produce Sticky Notepads with three levels of surface sizing: light, medium, and heavy. The light sizing is suitable for ballpoint pens and pencils. The medium sizing is suitable for rollerball and gel pens. The heavy sizing is suitable for fountain pens and for applications that require high color intensity. Wenzhou Yanhe Technology Co., Ltd. has been manufacturing sticky notepads for over 12 years.
2. What Is Surface Coating and How Does It Change the Writing Feel?
Surface coating is a thicker layer of clay, calcium carbonate, or polymer that is applied to the paper surface. The coating fills the surface irregularities and creates a very smooth, glossy finish. The coated surface is less absorbent than a sized surface. The ink sits on top of the coating and dries by evaporation rather than absorption. This produces a very sharp line, but the dry time is longer. The table below compares the writing feel of coated and uncoated sticky notepads.
| Surface treatment | Smoothness | Ink dry time | Smudge resistance | Typical application |
| Uncoated (no sizing) | Rough | Fast | Poor (feathering) | Pencil, quick notes |
| Light sizing | Moderate | Moderate | Good | Ballpoint, general use |
| Heavy sizing | Smooth | Slow | Very good | Gel pen, rollerball |
| Coated (matte) | Very smooth | Slow | Excellent | Fountain pen, premium notes |
| Coated (gloss) | Extremely smooth | Very slow | Excellent (if not touched) | Printing, labels |
Buyer's testing note: The coated surface feels luxurious, but it is not suitable for all users. Left-handed writers may smudge the ink because the dry time is longer. Users who write quickly may also smudge the ink. For general office use, a light or medium sizing is the best compromise. In our factory, we recommend the medium sizing for most sticky notepad applications. It provides a good balance of smoothness, dry time, and smudge resistance.
3. What Is Calendering and How Does It Affect Paper Smoothness?
Calendering is a mechanical process that presses the paper between polished steel rolls. The pressure compacts the fibers and smooths the surface. Calendering is often used in combination with sizing or coating. The more the paper is calendered, the smoother it becomes. However, excessive calendering can make the paper hard and brittle. The table below shows the effect of calendering on paper properties.
| Calendering level | Surface roughness (Ra, µm) | Smoothness | Ink holdout | Paper strength |
| None | 4.5 – 5.5 | Rough | Poor | High |
| Light | 3.0 – 4.0 | Moderate | Good | High |
| Medium | 2.0 – 2.8 | Smooth | Very good | Moderate |
| Heavy | 1.2 – 1.8 | Very smooth | Excellent | Low |
| Supercalendered | 0.8 – 1.2 | Extremely smooth | Excellent | Very low |
In our factory, we use medium calendering for our Sticky Notepads. This provides a smooth surface for writing without making the paper brittle. We also offer a light calendered version for applications that require higher tear strength. Wenzhou Yanhe Technology Co., Ltd. can provide paper samples with different calendering levels so that buyers can test the writing experience before ordering.
4. How Should Buyers Test Surface Treatments Before Ordering?
Buyers should test Sticky Notepads with the writing instruments that their customers use most. The test should include four assessments: line sharpness, dry time, smudge resistance, and feathering. The table below shows the test protocol we recommend.
| Test | Method | Acceptance criteria |
| Line sharpness | Draw a 10 cm line with each pen type | No feathering; edges are clean |
| Dry time | Write a word and touch with a finger every second | Dry within 5 seconds for ballpoint; 10 seconds for gel |
| Smudge resistance | Write a word and rub with a thumb after 10 seconds | No smearing or transfer |
| Feathering | Examine the line under a magnifier | No ink spread beyond the line edge |
| Show-through | Examine the back of the sheet | No visible ink on the reverse side |
In our factory, we provide a testing kit with each sample order. The kit includes three paper types (light sizing, medium sizing, and coated) and a set of test pens. We also provide a test report form that the buyer can use to record the results. Wenzhou Yanhe Technology Co., Ltd. recommends that buyers test at least three paper types before making a final decision.
Frequently Asked Questions About Paper Surface Treatments for Sticky Notepads
Summary for Stationery Buyers and Product Managers
The surface treatment of a Sticky Notepads determines how it interacts with the writing instrument and the user. Sizing controls the ink absorption rate. Coating provides a smooth surface but increases the dry time. Calendering compacts the fibers and improves the smoothness. The best surface treatment depends on the writing instrument, the user's handedness, and the environment. Buyers should test paper samples with the pens that their customers use most. Wenzhou Yanhe Technology Co., Ltd. has been manufacturing Sticky Notepads for over 12 years and provides paper samples and testing kits for our customers.
Wenzhou Yanhe Technology Co., Ltd. manufactures Sticky Notepads with light, medium, and heavy sizing, matte and gloss coating, and light, medium, and heavy calendering. We provide paper samples, test kits, and custom printing for all of our products.
