Knowledge

The drip coffee bag — a single-serve filter that hooks over a coffee cup — has transformed from a Japanese market specialty to a globally distributed retail product. In 2023, drip coffee bag exports from China grew by an estimated 28% year-over-year, driven by demand from South Korea, the United States, and European specialty coffee markets. For roasters and OEM coffee brands entering or scaling in this category, the machine choice is the single most consequential operational decision. There are three dominant drip coffee bag formats, each requiring a different machine configuration, and understanding the differences before purchasing can save months of production delay and significant capital misallocation.

The Three Drip Coffee Bag Formats

UFO Round Filter Bags

The UFO (or "round filter") format features a circular filter paper pre-formed into a flat disc shape, filled with 8–12 g of ground coffee, and heat-sealed. The consumer unfolds the tab ears before brewing. UFO bags are the most material-efficient format and are particularly popular in the Japanese and Taiwanese specialty coffee markets.

Machine specifications to look for:

• Filling range: 5–15 g per bag

• Speed: 30–80 bags/min depending on automation level

• Filter paper width: typically 80–100 mm

• Sealing: heat-seal with consistent temperature control (120–160°C)

Horizontal Hanging-Ear Drip Bags

The horizontal format is the most widely produced drip coffee bag style globally. A rectangular filter paper bag is filled, the top is sealed, and two "ear" tabs are unfolded by the consumer to rest on the rim of a cup. The outer envelope provides additional freshness protection and is the retail presentation standard in South Korea, Japan, China, and increasingly in the EU.

Machine specifications to look for:

• Inner bag fill: 8–12 g per bag

• Outer envelope: automatically applied inline

• Speed: 40–90 bags/min (inner bag line); 30–60 bags/min (with outer envelope)

• Supports nitrogen flushing: yes, on all Tonchant models

Vertical (Space Formula) Drip Bags

The vertical format places the filter in a vertical orientation, creating a slightly different brewing geometry that some roasters prefer for extracting certain coffee profiles. Less common than horizontal, but growing in popularity in the North American specialty market.

Machine specifications to look for:

• Inner bag dimensions: variable based on cup rim specification

• Speed: 25–55 bags/min

• Outer envelope compatibility: available

Comparing the Three Formats for OEM Buyers

Key Technical Requirement: Outer Envelope Integration

For buyers targeting retail markets in South Korea, Japan, or EU specialty channels, the outer envelope is not optional — it is a market entry requirement. The outer envelope provides:

• 1. A secondary hermetic barrier against oxygen ingress

• 2. The primary surface for retail branding (printed film)

• 3. Proof of tamper-evident packaging for some retailer specifications

Tonchant's drip coffee bag packing machines include integrated outer envelope application as standard on the horizontal and vertical models. The inner bag line and outer envelope line operate in a single pass, reducing the manual handling that creates quality control risks in two-step production processes.

CE Compliance for Drip Coffee Bag Equipment

All drip coffee bag packing machines exported from China to the EU must carry CE Machinery Directive (2006/42/EC) certification. This covers the safety of the machine's electrical systems, guarding, and emergency stop functions. Request the original CE certificate and Declaration of Conformity from any supplier before committing to a purchase.

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