How should you read coffee-filter models, paper weights and pack counts?
A coffee-filter brief often contains several kinds of numbers: a model code, a paper weight, a measurement and a count. Each answers a different question. A code identifies the entry in a product range. Dimensions describe particular edges or parts of the paper. Basis weight is recorded in grams per square metre. Pack count states how many filters are in the chosen presentation. Keeping these fields separate is a useful way to make your specification understandable at the next review.
This guide uses the published Zhongji Paper models as factual references. The worksheet methods are suggested purchasing practices. They do not establish a performance hierarchy between the listed paper weights and do not create an equivalence with another numbering system. The aim is a precise record: someone should be able to see which figures are published, which sample was reviewed and which questions still require confirmation.
What does a model code identify?
The cone range lists V01 and V02. The fan-shaped range lists 101 through 104. These entries each have their own dimensional row. Do not translate them into another familiar label unless that translation has been confirmed for the actual specification. The published range does not provide a general conversion to every alternative label.
Suggested approach: write the range name as well as the code. For example, record fan-shaped 102 rather than recording 102 alone. Then add the dimensions from that row, with their headings. If a discussion includes two formats, use separate rows so a change to one entry cannot accidentally be applied to the other.
Which cone and fan-shaped dimensions are published?
| Format and model | Top width | Side length | Bottom |
|---|---|---|---|
| Cone V01 | 14.5 cm | 10–10.5 cm | Not listed |
| Cone V02 | 16 cm | 11.6–12 cm | Not listed |
| Fan-shaped 101 | 12.5 cm | 7 cm | 5 cm |
| Fan-shaped 102 | 16.5 cm | 9–9.5 cm | 5 cm |
| Fan-shaped 103 | 19.5 cm | 11–12 cm | 5 cm |
| Fan-shaped 104 | 22.8 cm | 13.4–14.3 cm | 5 cm |
Preserve the heading when using a value. A width is not interchangeable with a side length, even when two figures look close. Preserve the ranges too. A published side-length range should not become a single exact value in a drawing merely because a form has room for only one number. Suggested approach: expand the field or attach the original dimensional reference, then request any tolerance information needed for your approval.
How should you interpret a slash in a basket model?
The basket range uses two values in each model name. The first gives the laid-flat diameter and the second the base diameter, in millimetres. For example, 200/80 identifies those two dimensions. The separate wall-height field is described as approximate. All three fields are useful when preparing the dimensional comparison.
| Basket model | Laid-flat diameter | Base diameter | Approximate wall height | Listed paper |
|---|---|---|---|---|
| 155/45 | 155 mm | 45 mm | 55 mm | 50 gsm |
| 185/50 | 185 mm | 50 mm | 68 mm | 50 gsm |
| 200/80 | 200 mm | 80 mm | 60 mm | 21 gsm |
| 250/110 | 250 mm | 110 mm | 70 mm | 21 gsm |
Suggested approach: retain the millimetre units in your table, and label any conversion you make for a drawing. Check the basket base and side depth, then review an opened sample. Record the approximate qualifier instead of making the wall-height value look like a guaranteed tolerance. If exact limits are required for your review, make them a question in the inquiry.
What does the listed paper weight tell you?
The published specification assigns 50 gsm to cone and fan-shaped filters and to basket models 155/45 and 185/50. It assigns 21 gsm to 200/80 and 250/110. These are model specifications. The reviewed pages do not publish a flow-rate comparison or a flavour result for the two weights, so a weight field should not become a performance promise.
Suggested approach: carry the stated weight into the product record next to its model. If you have a desired brewing procedure, review the sample under that procedure and document your own observations separately. Keep observations tied to the setup and sample that produced them. That way the record distinguishes the published paper specification from the results of your own review.
Why should piece weight stay separate from basis weight?
The cone and fan-shaped table also includes weight per piece. That is a separate entry from gsm. It belongs to the listed finished filter model, while the basis-weight field belongs to the paper specification. Suggested approach: use different column headings and retain the units for both. Do not substitute one value for the other when filling a product sheet.
If an artwork layout only needs a model and count, keep the fuller technical record elsewhere in the approval file. Shortening the retail wording need not mean discarding the underlying measurement and weight fields. A concise pack description and a detailed internal specification can refer to the same sample without forcing every figure onto the front of a box.
How do pack counts enter the model record?
| Product entry | Published counted presentation |
|---|---|
| Cone V01 and V02 | 50 or 100 per box |
| Fan-shaped 101, 102 and 103 | 50 or 100 per pack |
| Pre-folded natural-brown 30 × 30 cm | 50 or 100 in boxes or bags |
| Empty drip bags | Bag packs: 10, 20, 25, 30, 50, 100, 150 or 200; boxes: 50, 100, 150 or 200 |
The reviewed entries do not state a pack count for fan-shaped 104 or for each basket model. Treat those as confirmation points. Suggested approach: make a dedicated packing row rather than filling the gap from a nearby product. Keep pieces per pack, total packs and total pieces in separate labelled fields, and check that the quotation and artwork use the same selected count.
What should you review before approving the worksheet?
Read each row from left to right: format, model, dimensions with units, paper weight where listed, colour, pack count and presentation. Compare the row with the sample reference. Add a status such as published reference, sample reviewed or awaiting quotation to make its stage visible. These are proposed workflow labels, not additional product specifications.
Finally, remove shorthand that depends on memory. Replace an unexplained size with the dimension name, and replace an unexplained count with pieces per pack. Keep unresolved questions beside the relevant row. A model record prepared this way can support a focused inquiry and a later artwork review without giving the numbers meanings they were never assigned.
For a broader selection sequence, read how to choose a filter format. Send the completed model and packing brief to sales@zhongjipaper.com when you are ready to discuss the selected specification.