Open Top PP woven Bags — Expanded Technical & Market Analysis

What is Open Top PP woven Bags?

Open Top PP woven Bags are industrial sacks manufactured from woven polypropylene tapes and supplied with an unsealed mouth that is intended to be closed after filling. Why does that matter? Because this simple, open‑mouth geometry makes the bag compatible with manual, semi‑automatic, and fully automatic open‑mouth bagging lines across 5–50 kg fills. In day‑to‑day sourcing conversations you will also encounter their common aliases: open‑mouth PP sacks, PP woven open‑mouth bags, EZ‑open PP woven bags, polypropylene woven sacks, and—when a film is laminated—BOPP‑laminated woven sacks. The family resemblance is obvious: all variants are built on the same woven PP fabric platform and differentiated by surface treatment, liner options, graphics, and the way the open mouth is finally closed (sewn, heat sealed, drawstring, or built‑in easy‑tear tape).

What features distinguish Open Top PP woven Bags in real use? High tensile strength from biaxially oriented PP tapes; low tare mass; options for breathability or moisture barrier; excellent printable surfaces (especially with BOPP lamination); and a forgiving process window on typical filling equipment. As a result they bridge two worlds—warehouse‑grade durability for the logistics chain and shelf‑grade visual quality for branded goods.

How are Open Top PP woven Bags made? The core process is an elegant sequence: PP resin is extruded into a film, slit into tapes, then oriented to raise strength; circular or flat looms weave the tapes into fabric; optional coating or BOPP lamination is applied for barrier and print fidelity; flexographic or gravure systems add graphics; converting lines cut, hem, gusset, and seam the body while integrating liners or EZ‑open tear tape if needed. Quality gates—GSM checks, seam‑strength pulls, visual inspection, and count verification—anchor consistency before baling/palletizing.

Where do Open Top PP woven Bags work best? In a surprisingly wide set of applications. Food staples (rice, flour, sugar, salt, pulses, maize); feed & seed (animal feed, pet food, bird seed, fertilizers, agri‑inputs); industrial granules & powders (PP/PE resins, masterbatch, calcium carbonate, cementitious blends on non‑valve lines, minerals); construction & flood control (sand and aggregate); and retail‑adjacent SKUs (where BOPP graphics and EZ‑open tapes improve the consumer experience). A single platform, many forms of value—strength without bulk, structure without brittleness, branding without waste.

For additional background and category context, see the in‑category anchor link: Open Top PP woven Bags.

Why an Open Top? Equipment Logic, Product Logic, Market Logic

If packaging is a chain of decisions, the choice of an open mouth sits near the front of the line. Who is filling the bag—people, a semi‑auto clamp, or a robotic pick‑fill‑seal cell? What is going into the bag—pellets or powder, free‑flowing or cohesive, hydrophilic or oily? Where will it be stacked—indoor pallets or outdoor yards, temperate climates or sun‑belt depots? The Open Top PP woven Bags format survives these questions with surprising ease because it does not force a single sealing technology. Sewing stations are ubiquitous and economical; heat‑seal bars become practical once a PE liner or film lamination is present; drawstrings and EZ‑open tapes add consumer‑level convenience without disrupting industrial throughput.

Contrast this with valve bags: brilliant at high‑speed powder filling, but a narrower tooling lane. Or FIBCs: unmatched for 500–2000 kg payloads, but irrelevant for 10–50 kg retail or feed SKUs. The open‑mouth sack is the pragmatic middle: fast enough, tough enough, brand‑ready.

A skeptic might ask, “If the bag does not arrive sealed, don’t we risk inconsistency at the plant?” That depends on system engineering. When Open Top PP woven Bags are specified with hemmed mouths (to reduce fray), defined stitch densities, and seam fold types matched to drop‑test targets, the filling step becomes repeatable. When laminated or lined constructions are used, heat‑seal parameters can be standardized with SOPs just as rigorously as for mono‑material PE pillow bags.

From Requirement to Specification: a Systems Map

The most reliable specifications are built from subsystems that can be reasoned about independently and then recombined. For Open Top PP woven Bags, the practical map is:

Payload → Barrier → Handling → Filling → Compliance.

Payload. What is the unit mass—5, 10, 20/25, 40 lb, 50 lb, or 50 kg? Are there sharp granules, abrasive edges, or fatty residues? Free‑flowing pellets work with uncoated fabrics; dusty or grease‑bearing formulas push us toward liners or lamination. Higher mass and abrasion suggest heavier GSM, tighter meshes, and double‑fold bottoms.

Barrier. Do we need breathability (grains) or moisture/grease resistance (sugar, flour, pet food)? Options include uncoated fabrics, PP/PE coatings (15–30 μm), or BOPP laminations with inserted or tubular PE liners (20–80 μm). Micro‑perforations balance venting with dust control. Surface energy (corona levels) influences print adhesion and seal quality.

Handling. How will pallets be built, wrapped, and transported? Gussets improve cube efficiency; anti‑slip prints or textures increase stack friction; UV stabilizers protect in outdoor yards. Stitching parameters and hem treatments mitigate fray and burst risks in vertical drop tests.

Filling. Manual or automatic? Sewing with or without EZ‑open tape? Heat sealing with liners? Open‑mouth baggers thrive when bag mouth rigidity and dimensional tolerances are consistent, so defining those tolerances is not paperwork—it is throughput insurance.

Compliance. Food‑contact declarations (EU 10/2011, FDA 21 CFR 177.1520), local woven‑sack baselines (e.g., GB/T 8946‑2013), and plant certifications (ISO 9001/14001; ISO 22000/FSSC; BRCGS) determine which SKUs can cross which borders.

Design Levers and Trade‑Offs That Actually Move the Needle

When buyers hear “customizable,” they imagine infinite knobs. In practice a handful of levers account for most of the performance delta in Open Top PP woven Bags.

1. Fabric GSM and mesh. Raising GSM from 70 to 110 g/m² and choosing a tighter mesh (e.g., from 10×10 to 12×12) can materially lift seam strength and drop performance. But why overspec? Because the last 10 g/m² can be cheaper than claim handling.
2. Denier and tape orientation. Denier bands (700D–1400D typical) influence tear propagation. Better tape orientation yields higher tensile strength at equal GSM—useful for cost and for limiting fray at the mouth.
3. Bottom construction. Single‑fold plus one seam is cost‑efficient; double‑fold and double seam increases safety factors for 50 kg bags in rough handling. Block‑bottoms (on laminated bodies) create shelf‑friendly shapes but alter sewing and seal dynamics.
4. Barrier architecture. Uncoated breathes. Coated sheds moisture. BOPP laminated over woven PP delivers high‑fidelity print and scuff resistance; add a liner for powders or greases. Micro‑perfs bring venting without compromising the brand surface.
5. Closure method. Sewn closures fit almost any plant. Heat‑seals require film interfaces but enable hermetic targets. EZ‑open tapes balance consumer convenience with industrial stitch security.
6. Graphics system. Flexo is economical at 1–6 colors. Gravure/BOPP reaches photographic quality at 6–10 colors. The more vivid the bag, the more it must resist scuff and stack rub—lamination is more than marketing; it is durability by design.

The levers interact. A laminated body invites heat‑sealing and high‑color gravure; a breathable body pairs with sewing and modest flexo. System thinking means choosing a combination, not a single heroic knob to turn.

Specification Envelope (At‑a‑Glance)

Parameter	Typical Options/Values
Nominal capacity	5, 10, 20/25, 40 lb, 50 lb, 50 kg
Finished size (W×L)	30×45 → 55×92 cm; common 50×80 cm
Fabric GSM	60–150 g/m² (up to ~200 g/m² heavy duty)
Mesh	9×9, 10×10, 12×12, 14×14 (custom 4×4–16×16)
Denier	700D–1400D typical (300D–2000D available)
Lamination	BOPP 15–25 μm; PP/PE coating 15–30 μm
Liner	LDPE/HDPE 20–80 μm; tube or inserted
Mouth	Heat‑cut, hemmed, EZ‑open tear tape, drawstring
Bottom	Single/double fold & sewn; optional block‑bottom
Printing	1–8 colors flexo/gravure; photo‑grade on BOPP
UV stabilization	Additive package; specify hour rating

Features of Open Top PP woven Bags Revisited—Through the Lens of Failure Modes

It is easy to list features; it is harder to show how they prevent failure. Consider five common headaches and how Open Top PP woven Bags mitigate them:

Fray at the mouth. Heat‑cut or hem the mouth to fuse or capture yarn ends. Add mouth stiffness for automatic pickers. Result: fewer thread snags, smoother sewing, cleaner presentation.

Seam bursts. Choose the right fold geometry (single vs. double) and stitch density. Validate with drop tests at representative fill heights. Result: lower split rates in truck handling.

Moisture ingress. Insert a tubular liner or laminate with BOPP; micro‑perf only where venting is necessary. Result: stable product moisture and reduced caking for hygroscopic goods.

Stack slippage. Apply anti‑slip print, texture coats, or adjust ink coverage to raise friction. Result: safer pallet columns and fewer crushed corners.

UV embrittlement. Specify stabilizers for sun‑belt markets; adopt aging checks. Result: extended service window for outdoor yards.

Features are not brochure bullets; they are engineered answers to predictable failure modes.

Comparative Reasoning: Open‑Mouth vs. Valve vs. PE Pillow vs. Paper Multiwall

A fair comparison refuses caricature. Valve bags excel on fast powder filling with self‑closing valves. PE pillow bags own hermetic sealing for small formats. Paper multiwall bags win where compostability or paper‑only mandates apply. And yet Open Top PP woven Bags occupy the broadest middle: strong in 5–50 kg SKUs, forgiving on equipment, capable of premium graphics, and suited to both breathable and barrier builds. If your portfolio spans rice, feed, fertilizers, salts, and plastic resins, one open‑mouth platform can serve all with only BOM tweaks.

A question to ask: do you want a bag that dictates your line, or a line that dictates your bag? The open‑mouth path favors the latter.

Data‑Strengthening the Claims (Market Reality Check)

Search any major B2B catalogue and you will find the same practical clusters: finished sizes around 50×80 cm for 50 kg; GSMs between 70 and 120 g/m² for 25–50 kg sacks; meshes like 10×10 and 12×12; deniers spread from 700D to 1400D; printing from two‑color flexo to eight‑color gravure; closures that are heat‑cut and hemmed at the top, double‑fold and sewn at the bottom; EZ‑open options for consumer‑facing goods; and open‑mouth bagging machines advertised explicitly for the 5–50 kg range. It is not a conspiracy of suppliers; it is convergence on what actually runs, stacks, ships, and sells.

Where do outliers appear? Heavy‑duty mineral routes push GSMs near 150–200 g/m². Premium pet food pushes lamination thickness and color counts. Sun‑belt outdoor storage pushes UV packages and anti‑slip patterns. The rule is not “one size fits all,” but “one platform, many predictable branches.”

Case Analyses (Problem → Solution → Result)

Case A — Premium pet food, EU retail. Problem: fat‑bearing kibbles and high shelf competition. Solution: Open Top PP woven Bags with BOPP lamination (~20–25 μm), gussets for cube efficiency, PE liner for barrier, EZ‑open tape, and heat‑seal after fill. Plant certification under food‑grade standards. Result: photographic graphics with scuff resistance; tidy opening at home; steady compliance in audits.

Case B — 50 kg rice in humid storage (SEA). Problem: moisture pickup and seam splits after tall stacking. Solution: 95 g/m² fabric, 12×12 mesh, 40 μm liner, double‑fold bottom seam, anti‑slip print, hemmed mouth. Result: lower caking, fewer split claims, and improved pallet stability.

Case C — Fertilizer in sun‑belt depots (MEA). Problem: UV embrittlement and pallet slip. Solution: 110 g/m² UV‑stabilized fabric with bold anti‑slip ink coverage; single‑fold bottom for cost control; define acceptable sun exposure in contracts. Result: reduced field failures without bloating unit cost.

Case D — Plastic resin pellets (Americas). Problem: abrasion in rail transfers and traceability. Solution: 90–110 g/m² unlaminated body with hemmed open mouth for fast sewing; large lot/batch prints; tightened AQL on seams. Result: fewer scuffs and leaks; easier audits and recall drills.

Case E — Salt and de‑icing blends (cold climates). Problem: hygroscopicity, outdoor stacking, winter handling with gloves. Solution: laminated or lined Open Top PP woven Bags with high‑contrast graphics, anti‑slip textures, and EZ‑open tape operable with gloves. Result: cleaner pours in the field; preserved print legibility after wet cycles.

Quality Architecture and Test Routines That Matter

Dimensional tolerances are simple to write and easy to ignore—until baggers start mis‑clamping and needles miss hems. Treat tolerances as machine‑time insurance. The same is true of stitch density (SPM), bottom fold geometry, and drop‑test regimes. For barrier builds, check lamination/liner thickness, film adhesion, and whether micro‑perfs are consistent instead of random pinholes. For outdoor routes, implement accelerated UV aging and color‑fastness checks. For food contact, demand declarations of compliance and migration test reports from laminated and ink systems—not just the base PP.

A sample QA matrix for Open Top PP woven Bags:

Item	Method/Target	Why it matters
GSM verification	Gravimetric ± tolerance	Controls tensile/tear and cost
Cut length/width	± tolerance matched to clamp geometry	Prevents mis‑grips on fast lines
Stitch density	SPM per spec; visual audit	Correlates with seam strength
Bottom fold type	Single vs. double fold; inspection	Predicts drop performance
Drop tests	Representative fill height, repeats	Screens burst risk
Liner/lamination	Thickness μm; adhesion tests	Ensures barrier integrity
Micro‑perforation	Count/placement checks	Balances venting with dust control
UV aging	Accelerated exposure	Guards against sun‑belt failures
Ink/print adhesion	Tape/rub tests	Preserves brand legibility
Cleanliness	SOP audit; foreign matter checks	Food safety & regulatory defense

Regional Configuration Patterns (Illustrative, Not Exhaustive)

Region	Dominant Uses	Go‑To Construction	Closure	Graphics	QA focus
EU	Pet food, specialty grains	80–110 g/m² + 20–25 μm BOPP; gusseted	EZ‑open + heat‑seal over liner	Photo‑grade	EU 10/2011; hygiene certifications
North America	Feed, seed, resin, salt	80–110 g/m²; unlam/coat; hemmed	Sewn with easy‑open	Flexo/gravure 4–8 c	FDA 21 CFR 177.1520; AQL tightening
SE Asia	Rice, sugar, flour	70–100 g/m²; optional liner	Sewn; heat‑seal for sugar	3–6 c flexo; BOPP on premium	DoC; humidity risk plan
MEA	Rice, fertilizer, grain	100–120 g/m²; UV‑stabilized; anti‑slip	Double‑fold bottom sewn	Bold branding	UV exposure spec; seam burst targets
LATAM	Feed, fertilizer, resin	90–120 g/m²; optional gussets	Sewn; easy‑open	4–8 c flexo	Lot traceability; artwork localization

Patterns are not destinies; they are starting points. The point of Open Top PP woven Bags is not to constrain you but to give you a reliable baseline for adaptation.

Materials Science Notes That Help Buyers Ask Better Questions

Polypropylene tapes are workhorses because orientation raises modulus and tensile strength without heavy mass penalties. Denier choices interact with weave density to influence tear propagation. Coatings (PP/PE) increase moisture resistance but reduce breathability; laminations using BOPP introduce print carriers with good scuff resistance and dimensional stability. Liners change the interface at the mouth for heat‑sealing; they also carry the burden of food‑contact migration limits when directly contacting product. UV packages are not magic; they have an hours‑of‑sun envelope that should be specified and audited.

Ask the supplier: What is the tape draw ratio? What corona treatment level precedes printing? What is the specified SPM for bottom seams? How many drops are in the type test, and from what height? Each answer turns a brochure into a specification.

Procurement and Risk Controls as a Checklist (Not Paperwork)

1. Fix the payloads and drop/stack expectations; let those numbers drive GSM, mesh, and seam geometry.
2. Choose the barrier architecture based on product chemistry and climate, not fashion.
3. Decide the closure method with plant reality in mind—sewn, heat‑seal, or a hybrid with EZ‑open tape.
4. Align compliance paths early (EU/US/CN frameworks; plant certifications).
5. Lock art files, color counts, and abrasion expectations so print systems can be chosen on purpose.
6. Specify UV and anti‑slip if outdoor stacks or tall pallets are unavoidable.
7. Set AQL sampling and acceptance criteria; require lot coding and retain samples.
8. Run a line trial; update SOPs; only then scale purchase orders.

This is not bureaucracy. It is insurance that Open Top PP woven Bags will perform in the wild exactly as they do in the factory.

Frequently Contested Questions (And Clear Answers)

“Aren’t paper multiwall bags more sustainable?” Sometimes, in paper‑only mandates or compost streams. But Open Top PP woven Bags achieve higher strength‑to‑weight, often lower total transport damage, and are recyclable in PP streams. When laminated with BOPP (a PP film) they remain mono‑polyolefin and easier to sort than mixed‑material laminates.

“Do open‑mouth sacks leak more powder?” Not when built with liners and closed correctly. Many powder SKUs today run as open‑mouth with liners because they share filling equipment with granular products; the trick is engineering the mouth and seam, not blaming the format.

“Isn’t a valve bag faster?” For many fine powders, yes. For mixed portfolios that include grains, pellets, and fats, the versatility of Open Top PP woven Bags often outweighs the speed advantage of a single powder‑specialist format.

“Will BOPP scuff on pallets?” Less than unlaminated print. BOPP lamination creates a tough print carrier. Pair it with anti‑slip solutions to protect stacks and brand.

“What about UV exposure in hot climates?” Specify UV stabilizers with an hours‑rating and test periodically. Bags are not sunshields; they are engineered textiles. Treat them like such.

Quick Reference: Uses of Open Top PP woven Bags (Bolded for Clarity)

• Food staples: rice, flour, sugar, salt, pulses, maize
• Feed & seed: animal feed, pet food, bird seed, fertilizers, agri‑inputs
• Industrial granules & powders: plastic resins, masterbatch, calcium carbonate, minerals, cementitious blends (non‑valve lines)
• Construction & flood control: sand and aggregate sacks
• Retail‑adjacent consumer goods: high‑graphic BOPP bags with EZ‑open convenience

Each bullet is a shorthand for a bundle of design choices.

Final Notes on Language, Not a Conclusion

Rhetoric matters in technical buying. Parallelism clarifies trade‑offs; contrast prevents false choices; questions pull hidden assumptions into the light. The goal of this expanded rewrite is not to decorate a brochure but to give working teams—buyers, quality engineers, plant managers—a shared mental model for specifying and running Open Top PP woven Bags without surprises. If a specification makes failure harder and success easier, it has done its job.

Ability to Serve Complex Product Profiles

Open Top PP woven Bags are designed to accommodate a wide spectrum of particle morphologies—free‑flowing pellets, angular granules, cohesive powders, and mixed formulations. Horizontally, they bridge multiple disciplines: textile engineering (woven fabric geometry), materials science (polyolefin behavior), and packaging operations (filling/closure). Vertically, they connect decisions from polymer grade → tape orientation → fabric GSM/mesh → seam architecture → closure method. The result is a single platform that can be tuned to control dust, protect against moisture, and resist tearing, even when product shapes vary within the same SKU family.

Selecting Appropriate Constructions and Filling Equipment

Choosing Open Top PP woven Bags means choosing a configuration: unlaminated for breathability, coated or BOPP‑laminated for barrier and graphics, liner‑inserted for powders or greases. From a systems lens, the bag is half the story; the other half is the line. Manual clamps suit short runs; semi‑automatic open‑mouth baggers accelerate 10–50 kg fills; fully automatic pick‑fill‑seal cells demand mouth rigidity and narrow dimensional tolerances. Introduce EZ‑open tear tape where consumer convenience matters. Integrate anti‑slip coatings if tall pallets or inclined conveyors are expected. Each choice ties back to a measurable outcome—cleaner fills, faster cycles, safer stacks.

Significance of Material Selection for Performance

The polymer is policy. Open Top PP woven Bags rely on polypropylene tapes whose draw ratio and denier (often 700D–1400D) govern tensile strength and tear propagation. Fabric GSM (e.g., 70–120 g/m² for 25–50 kg) and mesh (10×10 to 12×12 common) tune the balance between toughness and weight. Barrier architecture widens the envelope: PE liners (20–80 μm) reduce moisture ingress; PP/PE coatings (15–30 μm) protect against splash and scuff; BOPP laminations (15–25 μm) deliver high‑fidelity print and a tougher surface. Horizontally, these materials intersect with ink systems and corona treatment; vertically, they cascade down to seam choices and drop performance.

Quality Control and Testing That Matter

A credible QA plan for Open Top PP woven Bags starts with inputs (GSM verification, tape denier checks) and ends with outputs (seam strength, drop tests, migration tests for food contact where applicable). Stitch density (stitches per meter) correlates directly with seam integrity; bottom fold type (single vs. double) predicts burst resistance. For laminated or lined builds, verify film thickness and adhesion, and treat micro‑perforation as a controlled feature, not a random artifact. Outdoor routes demand UV stabilization metrics with hours‑of‑sun targets. The logic is circular in the best way: better inputs → stable processes → fewer field claims → cleaner audits.

Industries Where the Format Excels

Open Top PP woven Bags span agriculture (rice, maize, pulses, seeds), animal nutrition (feed, pet food, bird seed), industrial minerals (calcium carbonate, silica, bentonite), chemicals (fertilizers, salts), and polymers (PP/PE pellets, masterbatch). Horizontally, the same bag architecture can serve both food staples and industrial goods by toggling barrier and hygiene levels. Vertically, each sector imposes distinct stressors—humidity in Southeast Asian rice depots, UV exposure in Middle East yards, abrasion in resin transfers—driving region‑specific BOMs that keep the platform dependable.

Everyday Products You’ve Likely Seen

Supermarket rice sacks, farm‑store feed bags, winter de‑icing salt packs, resin bags near molding presses—these are everyday faces of Open Top PP woven Bags. The user experience differs: brand‑forward BOPP prints for pet food; breathable uncoated bodies for grains; liner‑assisted builds for dusty blends; EZ‑open ribbons where tools aren’t handy. A single platform, many familiar touchpoints.

Evaluating Supplier Proficiency

Proficiency shows up in details you can measure. Look for suppliers of Open Top PP woven Bags who can share tape draw ratios, mesh/GSM tolerances, stitch density targets, and drop‑test regimes. Ask about their food‑contact documentation (EU 10/2011, FDA 21 CFR 177.1520) and plant certifications (ISO 9001/22000; BRCGS Packaging Materials). Horizontally, proficiency blends polymer knowledge, loom control, and converting discipline. Vertically, it links sales specs to shop‑floor SOPs to outbound QA, so what you approve on paper is what ships on pallets.

Issues to Address When Requesting a Quotation

A precise RFQ for Open Top PP woven Bags includes: finished size (W×L), capacity target (e.g., 25 kg or 50 kg), fabric GSM and mesh, denier band, lamination or coating details, liner thickness and style (inserted vs. tubular), mouth treatment (heat‑cut or hemmed), closure (sewn, heat‑seal, EZ‑open), printing method and color count, UV/anti‑slip needs, and compliance documents required. Include pallet patterns and expected stack height; these numbers inform anti‑slip choices and seam geometry. The tighter the RFQ, the fewer iterations to hit spec.

Evaluating Suppliers for Quality and Turnaround

Lead time is capacity plus predictability. For Open Top PP woven Bags, confirm loom availability, printing queues, and converting bottlenecks (cutting, sewing, liner insertion). Sample turns reveal more than brochures: do dimensions sit within tolerance? Are hems tidy and threads trimmed? Do printed colors match Pantone targets within ΔE limits? Request lot coding conventions and retention‑sample policies. The payoff is fewer surprises when orders scale.

What Premium Open‑Mouth Bags Are and Why They Elevate Protection

Premium Open Top PP woven Bags are not different in name but in architecture: tighter meshes for cleaner print, heavier GSM for higher drops, BOPP for shelf‑grade graphics, liners for grease or moisture control, and mouth/closure packages matched to the filling line. Horizontally, these upgrades combine materials and process refinements; vertically, they translate into less damage, better brand legibility, and smoother audits. Up‑spec only where the failure mode justifies it—engineering, not ornament.

How Open Top PP woven Bags Differ from Valve Bags and FIBCs

Open‑mouth sacks trade a self‑closing valve for flexibility in closure and filling equipment. Open Top PP woven Bags excel where product diversity and mixed lines matter—manual to fully automatic baggers, 5–50 kg fills, graphics that must survive pallet rub. Valve bags dominate homogeneous fine powders needing speed; FIBCs dominate bulk logistics at 500–2000 kg. Horizontally, all three are woven polyolefin systems; vertically, they address different operating scales and closure philosophies. Choosing among them is less a contest and more a fit‑for‑purpose decision tree.

What Material Combinations Are Used

Base fabric: oriented PP tapes woven into tubular or back‑seamed cloth. Barrier options: PP/PE coating or BOPP lamination; liners in LDPE/HDPE at 20–80 μm. Mouth treatments: heat‑cut to fuse yarns, or hemmed to capture fray. Bottoms: single‑fold sewn for economy or double‑fold for tougher duty; block bottoms on laminated bodies for squarer stacks. Printing: 1–6 color flexo for economy, 6–10 color gravure on BOPP for photographic effect. Each layer in Open Top PP woven Bags serves a purpose—strength, sealability, breathability, graphics, handling.

Quick Specification Snapshot (For Fast Alignment)

Parameter	Typical Options/Values
Capacity	5, 10, 20/25, 40 lb, 50 lb, 50 kg
Finished Size (W×L)	30×45 → 55×92 cm; common 50×80 cm
Fabric GSM	70–120 g/m² mainstream; up to ~200 g/m² heavy‑duty
Mesh	10×10, 12×12 (custom 9×9–14×14)
Denier	700D–1400D typical
Lamination/Coating	BOPP 15–25 μm; PP/PE coat 15–30 μm
Liner	LDPE/HDPE 20–80 μm (inserted or tubular)
Mouth/Closure	Heat‑cut or hemmed; sewn; heat‑seal; EZ‑open tape
Bottom	Single or double fold & sewn; block‑bottom (laminated)
Add‑ons	Anti‑slip coat/print; UV stabilization; micro‑perforation

For a broader product overview, see the anchor page: Open Top PP woven Bags.

References

1. Commission Regulation (EU) No 10/2011 on plastic materials and articles intended to come into contact with food.
2. U.S. FDA 21 CFR 177.1520 — Olefin polymers for food contact applications.
3. GB/T 8946‑2013 — Plastic woven sacks: General technical requirements (China National Standard).
4. BRCGS Packaging Materials — Global Standard for Packaging and Packaging Materials.
5. ISO 9001 and ISO 22000 — Quality and Food Safety Management Systems guidelines for packaging producers.
6. Representative open‑mouth bagging machinery datasheets (5–50 kg range) and supplier application notes on UV stabilization and anti‑slip printing for woven PP sacks.