A clean bag must still protect the food and hold together
Grease marks, damaged folds, open glue lines and a soft pastry crust are different problems. Record when and where the change starts before choosing a new paper, coating, bag structure or packing procedure. Stronger grease resistance does not automatically improve shelf life, and air permeability is not a promise of crispness.
This route connects suppliers, converters and bakeries through retail bags for freshly baked, fat-containing bread. Carrier bags, frozen-food bags and long-life pouches need separate specifications. This is a source-based development method; BIOTEN product validation for the candidate application route has not been performed.
Specify the food and the delivery process together
Choose one food; describe fat contact, dimensions, quantity and desired crust and crumb texture. Map baking, cooling, packing, display and expected consumption, including actual packing temperature, closure and environment. “Greaseproof paper bag” alone is not an adequate specification.
Draw folds, bottom, joints, window, perforations and food contact zones. Separate paper basis weight and dry coating weight. For local treatment, record treated area and registration. Consider where the food can move. Test a cooling or closure improvement before deciding that an extra barrier is needed.
Compare bag routes by the job they do
| Candidate route | Task to investigate | Checks to keep connected |
|---|---|---|
| Current or purpose-made bag paper | Short retail service and established converting | Actual shortfall, bottom folds and filling |
| Speciality grease-resistant paper | Grease marking under specified contact | Resistance after folding, gluing and food texture |
| Waterborne functional coating | Surface barrier suited to the use | Drying, blocking, creases and adhesive compatibility |
| Local bottom or contact-zone treatment | Function where the food actually touches | Coverage, registration, food movement and waste |
| Window, perforation or closure change | Display, filling and moisture exchange | Window material, adhesive, strength and complete-bag performance |
Detpak's A059S0001 is a two-ply bag with a greaseproof inner ply, listed for hot, high-grease contents and limited shelf life. Its B123S0010 window baguette bag is listed for mild grease and limited shelf life. These are distinct use boundaries, not interchangeable “food bags.” Lined bag · Window bag
Choose the measurement before comparing the number
| Question | Information to retain | Common misreading |
|---|---|---|
| Does the surface repel grease? | Method, reagent, test face and converted state | Treating a rating as food holding time |
| How long until fat penetrates? | Medium, temperature, crease and breakthrough time | Predicting the bottom from an uncreased sheet |
| How does moisture move? | WVTR, conditions on both sides and full structure | Converting air permeability directly into WVTR |
| Is the food texture acceptable? | Crust, crumb, timing and sensory or texture method | Using average moisture to represent all eating qualities |
| Can the joint carry the load? | Adhesive, interface, pressure, maturation time and failure mode | Transferring an uncoated-paper bond result to a coated surface |
The public scope of ISO 16532-1 covers fat penetration testing of creased or uncreased paper. ISO 16532-2 addresses surface repellency rather than penetration. Obtain and apply the complete, suitable method before testing; an abstract is not an operating procedure. Part 1 scope · Part 2 scope
Moisture content and water activity describe different properties. Crust crispness and crumb softness also need separate observations. An existing croissant study provides a useful example of measuring moisture, texture and sensory response together. Its structures, values and storage times do not establish performance for a new paper bag. University research record
Design the first comparison to isolate a change
Randomly allocate food from the same baking batch to current and candidate bags. Initially hold cooling, packing condition and closure constant. If a problem remains, compare cooling or closure separately. Record food batch, placement, handling and evaluation points. Several samples from one batch cannot replace independent baking or converting runs.
Use separate specimens when evaluation requires opening; reopening a bag changes its environment. Keep lighting, background and distance consistent in photographs. Record total bags, failures, first grease mark or joint opening, and observation cutoff. Initially describe a dark or wet patch as observed; a photograph alone may not distinguish grease from moisture.
Let the failure location guide the next step
| Field problem | Priority comparison or record |
|---|---|
| Flat paper looks good but the folded bottom stains | Before and after folding, glue versus non-glue zones, actual food position |
| The bag is clean but the crust softens | Cooling, closure and material with food held constant; evaluate crust and crumb separately |
| Food dries without visible droplets | Weight change, environment and openness; no condensation is not a pass criterion |
| Glue opens or the window lifts | Contacting surfaces, application, pressure and maturation; interface, adhesive or paper failure |
| Local treatment gives inconsistent results | Registration with folds, food movement and converting variation |
| Opening or filling is difficult | Bag mouth, dimensions, friction and filling under the same handling procedure |
Connect food batch, paper reel, treatment, print, adhesive, window, converting run and finished-bag codes. Record actual conditions so bakery, material and converting teams can review the same event, rather than exchanging only “good” and “bad.”
Base the stage decision on the complete delivery
Advance when the bag and joints meet agreed requirements, food is acceptable throughout the intended consumption window, converting and store handling remain workable, and use documentation matches the structure. If reduced staining sacrifices the desired texture, adjust the route. If cooling or closure already resolves the problem, evaluate that simpler option first.
Calculate manufacturing cost per thousand acceptable bags separately from cost per thousand acceptable food deliveries. Include materials, window, adhesive, converting, repacking and attributable losses within consistent boundaries. Leave unknown benefits blank and avoid counting food loss twice. Not all bakery waste can be attributed to packaging.
Food-contact documentation must account for paper, treatment, print, adhesive and window in the intended market. Recycling or composting requires its own complete-structure evidence; a certificate for an ingredient or window does not cover every combination. 4evergreen design guidance
Send partners a question they can answer
Specify food and grease exposure for paper suppliers, treated zones for coaters, structure for bag makers, and evaluation targets for laboratories. Confirm listed suppliers’ specifications and project fit. The professional tools connect these inputs to a review decision.
Products, processes and companies
These selected references show where to continue a technical conversation. Each product statement stays with its named source and entity; listing is not a recommendation or confirmation of supply. Company links lead to the existing Chinese profiles; the summaries below are provided in English.
Consumer-bag and grease-resistant papers
Billerud (Chinese profile)
The Basix range distinguishes Repel Pure, WS and Glaze S.
Ask for: Request current grade specifications, folded grease performance and gluing guidance; do not use expired sheets as supply guarantees.
Product sources
Speciality foodservice papers
Ahlstrom (Chinese profile)
Grease-Gard covers foodservice bags and wraps; PLUS separately describes water holdout.
Ask for: Confirm grade, food and converting conditions; a family-level description does not replace bag testing.
Product sources
Paper-bag machinery
HolwegWeber (Chinese profile)
The RS 1500 page lists flat, satchel and web-window bag options.
Ask for: Confirm actual web, bag geometry, window, gluing and inspection configuration; trial the intended paper.
Product sources
Finished food-paper bags
Detpak (Chinese profile)
Lined greaseproof and mild-grease window bags provide distinct structure and use references.
Ask for: Confirm SKU, food temperature and grease range, window and adhesive, and local supply specification.
PHA waterborne paper coating and printing
Jinyinlian (Tianjin) New Material Technology Co., Ltd. (Chinese profile)
Publishes PHA waterborne coated-paper information; an enquiry resource for cupstock and bag-paper samples.
Ask for: Specify the paper and use; confirm finished basis weight, coated sides, dry coat weight and sample documents.
Take the method into your work
Editable bilingual templates. Blank result fields mean not recorded; a completed form is not an acceptance decision.
Bilingual validation workbook for four pathways
Separate editable forms for paper cups, paper bags, food paper based flexibles and waterborne coated paper connect use, materials, processing, observations, sources and stage decisions. No preset thresholds or measured results.
Bilingual validation brief for four pathways
Agree objectives, controls, methods, samples, evidence and responsibilities, with dedicated pathway briefs and manually recorded stage decisions.
Prepare a brief for this working path
Detailed problem guides and resource records
- 纸袋渗油：袋面、折痕和袋底分别查 (Chinese problem guide)
- 可颂返潮变软：同时看袋材、冷却和袋口 (Chinese problem guide)
- 纸袋开胶：胶线、涂层和袋底怎样定位 (Chinese problem guide)
- 涂布纸粘连反粘：先分清有墨与无墨 (Chinese problem guide)
- 纸杯纸袋怎么比成本：算到合格交付 (Chinese problem guide)
- Basix Repel Pure / WS 与 Glaze S (Chinese source record)
- Grease-Gard / Grease-Gard PLUS 餐饮纸族 (Chinese source record)
- HolwegWeber RS1500 袋型与选件 (Chinese source record)
- A059S0001 内衬袋与 B123S0010 开窗法棍袋 (Chinese source record)
- 金印联｜PHA水涂纸与28–450 g/m²纸张定量范围 (Chinese source record)
Related application studies
- BA020 · Retail paper bags for freshly baked enriched breads (Chinese full study)
Sources and interpretation
The guide combines cited public information with editorial working methods. Industry references, proposed comparisons and BIOTEN product results are distinct. No new BIOTEN product-validation result is reported here.
- Billerud: Basix bag-paper range
Published range distinguishes bag-paper grades; historical technical values are not automatically current supply guarantees.
Source record: 2026-10-23 - Ahlstrom: foodservice papers
Product families and applications; family-level performance or certification wording is not treated as a bag result.
Source record: 2026-10-23 - HolwegWeber: RS 1500
Manufacturer bag formats and options; nominal capability is not acceptable output with the target paper.
Source record: 2026-10-23 - Detpak: A059S0001 lined greaseproof bag
SKU lists hot, high-grease contents and limited shelf life; regional environmental claims are not transferred to other markets.
Source record: 2026-10-23 - Detpak: B123S0010 window baguette bag
SKU lists mild grease and limited shelf life, not suitability for every bakery product.
Source record: 2026-10-23 - Jinyinlian: PHA waterborne coated-paper introduction
Supplier statement dated 15 May 2026 supports PHA paper and converting scope. Its 30–400 g/m² range is separate from the user-supplied 28–450 g/m² update; performance claims are not adopted.
Source record: 2026-10-23 - ISO 16532-1:2008: public scope
Fat penetration and creased/uncreased specimens; scope reviewed only, full method not obtained.
Source record: 2026-10-23 - ISO 16532-2:2007: public scope
Distinguishes surface repellency from penetration; scope reviewed only, full method not obtained.
Source record: 2026-10-23 - Lund University: 2015 croissant-packaging study record
Original university thesis record and abstract; informs separate moisture, texture and sensory assessment, without transferring optimum values, shelf-life periods or waste rates.
Source record: 2026-10-23 - 4evergreen: Circularity by Design Guideline
Official 2026 guide entry for recycling routes, collection and sorting; not certification of a particular cup.
Source record: 2026-10-23 - Jinyinlian: coating and cup-printing centre
Waterborne paper conversion and cup/bag application directions; not proof that every bag uses PHA or has completed validation.
Source record: 2026-10-23