Sunflower Seed BOPP Bag

The Sunflower Seed BOPP Bag,A high-performance packaging solution engineered for strength, visual appeal, and cost-efficiency; is the definitive choice for agricultural packaging. By combining the structural integrity of woven polypropylene (PP) with the exceptional clarity and moisture resistance of biaxially-oriented polypropylene (BOPP) film, this packaging format delivers durability and brand impact in equal measure. It protects valuable commodities-such as sunflower seeds, walnuts, and similar produce-from external contaminants, while providing an ideal canvas for bold, high-definition printing to elevate retail presentation.

 

Designed with flexibility in mind, these pp woven bags can be customized in various sizes, finishes, and printing styles, helping brands create a cohesive identity while streamlining logistics. From storage and handling to shipping and shelf display, the BOPP bag ensures that your product remains safe, fresh, and market-ready.

 

Tailored specifically for the sunflower seed industry, these bags are crafted with precision to meet the nuanced demands of agricultural packaging. Each unit integrates BOPP film laminated onto premium-grade PP woven fabric, providing excellent tensile strength and environmental resistance. The multilayer construction helps shield contents from humidity, air exposure, and microbial threats.

 

 

Material Composition

- Base Fabric: Woven Polypropylene (PP)

- Film Layer: Biaxially-Oriented Polypropylene (BOPP)

 

 

Color Customization

- Milky White, Transparent, Semi-Transparent, Beige, Blue, Yellow

- UV Protection Additive Available

- Standard CMYK Rotogravure printing with Fully Customizable Pantone spot colors

 

Fabric Details

- Structure: Tubular or Back Seam

- GSM Range: 30–100 GSM (adjustable)

- Mesh Configuration: 5x5 to 14x14

- Denier Range: 600D to 2000D

 

Bag Dimensions

- Width: 30–70 cm (custom options)

- Length: 40–115 cm (custom options)

- Capacity Options: 2kg, 5kg, 10kg, 20kg, 25kg, 50kg, or tailored per requirement

 

Top Finish Options

- Heat Cut, Cold Cut, Zigzag Cut, D-Cut, Hemmed top

 

Bottom Sealing Methods

- Single-Line or Double-Line Sewing

- Easy-Open Design

- Block Bottom or Pasted Valve Options

 

Surface Coating

- Type: PE Bright or Matte Finish

- Thickness: 9–25 GSM

- Coverage: Single or Double-Sided

 

Lamination Options

- Gloss or Matte BOPP Film

- Kraft Paper or White Paper

- One-Sided or Two-Sided Application

 

Printing Capabilities

- Flexographic Printing: Up to 5 Colors

- Gravure Printing: Up to 10 Colors

- Photo-quality graphics, logos, branding elements

 

Bag Styles Available

- Tubular with M-Gussets

- Back seam with M-Gussets

- Block Bottom with open mouth

 

Optional Features

- Internal PE Liners

- Anti-Slip Surface Treatment

- Micro-Perforation for Airflow

- Drawstring Closures

- Seal Tape Enhancements

 

Packaging & Logistics

- Packing: In Bales or Palletized with Cardboard

- Minimum Order Quantity: 5,000 Units

- Production Capacity: 300 Tons/Month

- Loading Port: Qingdao, China

- Delivery Timeline: 15–40 Days Depending on Quantity

 

Certifications

- FSSC 22000

- ISO 22000

- ISO 9001

- BRC Global Standard

- SGS Inspection Available

 

Payment Terms

- T/T (Telegraphic Transfer)

- L/C (Letter of Credit)

 

Samples

- Complimentary Samples Provided Upon Request

 

 

Fabric Material	PP (Polypropylene)
Fabric Color	Milky white/transparent/semi-transparent/beige/blue/yellow/customized color/UV add
Fabric Ctructure	Tublar/Back seam
Fabric GSM	30-100 gsm customized
Fabric Mesh	5*5-14*14
Fabric Denier	600-2000 D
Bag Width	30-70cm customized
Bag Length	40-115cm customized
Capacity	2kg, 5kg, 10kg, 20kg, 25kg,50kg or customized
BagTop	Heat cut/ cold cut/ zigzag cut/D cut/hemmed top
Bag Bottom Seal	Single line sewing/ double lines sewing/ easy open/ block bottom pasted/ valve
Coating to Fabric	PE Bright coating/Matt coating 9-25 gsm/( one side/ both sides)
Lamination to Fabric	Bopp/Matt Bopp/Kraft paper/White paper( one side/ both sides)
Printing	Flexo printing Max 5 colors/ gravure printing Max 10 colors
Bag Shape	Tubular/ M gussets/ Block bottom/Valves
Optional Processing	PE liner inside/ anti slip/Micro perforation/drawstring/ seal tape
Packaging	In bales/ Palletization with cardboard
MOQ	5000 pics
Production Capacity	300 tons/ month
Loading Port	Qingdao
Delivery Time	15-40 days
Certification	FSSC22000/ISO22000/ISO9001/BRC/SGS
Payment	TT/LC
Samples	Free samples available

 

 

1. Advanced Barrier Protection

Engineered to create a formidable barrier against moisture, dust, and contaminants, the BOPP bag ensures prolonged product freshness. This protective feature is particularly critical for perishable goods like seeds that are sensitive to humidity and air exposure.

2. Lightweight yet Structurally Strong

Despite its featherlight composition, the BOPP laminated bag offers superior resilience. Its low weight minimizes transport costs, while its strength ensures that the contents remain intact from warehouse to shelf.

3. Superior Print Surface for Maximum Branding Impact

With a glossy or matte finish, the bag provides an impeccable canvas for vivid, multicolor branding. Whether showcasing detailed imagery or bold logos, the surface enables high-resolution print clarity-transforming your product into a shelf standout.

4. Rugged Durability for Harsh Conditions

Manufactured with high-grade BOPP and PP materials, these bags exhibit exceptional resistance to punctures, abrasions, and mechanical stress. Whether stacked, dropped, or compressed, the packaging retains its shape and protective function.

 

5.How Sunflower Seed BOPP Bags are produced-from raw material selection to final packaging

1). Raw Material Procurement

- Polypropylene (PP) granules and Biaxially-Oriented Polypropylene (BOPP) film are sourced from certified suppliers.

- Materials undergo quality inspection to ensure compliance with food safety and industrial standards.

 

2). PP Woven Fabric Production

a. Extrusion

- PP granules are melted and extruded into thin strands using an extrusion machine.

- These strands are rapidly cooled and cut into flat tapes (yarns) of specified denier.

 

b. Stretching & Winding

- The tapes are stretched to align the polymer chains for enhanced strength.

- Stretched tapes are wound onto bobbins for use in the weaving stage.

 

c. Weaving

- Tapes are woven into tubular or flat PP fabric using circular or flat looms.

- Mesh density and GSM (grams per square meter) are adjusted per product requirements.

 

3) BOPP Film Printing(Kraft Paper Optional)

BOPP (Biaxially Oriented Polypropylene) film printing is a critical step in producing premium laminated woven bags. This stage transforms the plain BOPP film into a visually impactful, brand-rich substrate that enhances both product appeal and consumer recognition. The process involves several sub-steps, each contributing to the quality and effectiveness of the final printed film.

 

a. Design & Artwork Approval

Before printing begins, the visual design and branding elements must be finalized. This step involves close collaboration between the client and the design team.

- Digital Design Preparation: Using professional graphic design software (such as Adobe Illustrator or CorelDRAW), the artwork is prepared with precise dimensions, bleed areas, color separations, and alignment guides to ensure compatibility with printing machines.

- Client Approval: The final artwork is submitted to the client for review. Any revisions are made, and once approved, it is considered print-ready.

- Cylinder or Plate Making: Depending on the chosen printing method (Rotogravure or Flexographic), engraved printing cylinders (for gravure) or flexographic plates (for Flexo) are created. These tools carry the design and determine the sharpness, color depth, and detail of the printed image.

This phase ensures that every brand guideline is met, and the resulting prints are consistent across all production runs.

 

b. Rotogravure or Flexographic Printing

Once the artwork is approved and print tools are ready, the BOPP film moves into the actual printing phase.

- Rotogravure Printing: This method uses engraved metal cylinders that transfer ink directly onto the BOPP film. It is highly effective for high-volume runs and delivers superior image resolution, photo-realistic graphics, and consistent quality. It's ideal for detailed, multi-color prints and complex gradients.

- Flexographic Printing: Alternatively, Flexo printing uses flexible photopolymer plates to apply ink to the kraft paper. It is cost-effective for simpler designs or moderate production volumes and offers quick changeovers and fast drying times.

- Multi-Color Printing: Both methods allow for up to 8–10 colors, ensuring vivid and eye-catching results. Registration systems ensure perfect alignment between colors for sharp, professional output.

- Quality Assurance: During printing, advanced control systems and optical scanners monitor color accuracy, registration, and defect detection in real time.

This step is essential for enhancing brand visibility and consumer appeal, especially in competitive retail environments.

 

c. Drying & Curing

After the ink is applied to the BOPP film, the printed material goes through a drying phase to ensure durability and adhesion.

- Hot Air or Infrared Dryers: The film passes through temperature-controlled dryers that quickly evaporate the solvents or water content in the ink without damaging the film.

- Curing Process: In some cases, UV-curable inks may be used, especially for specialty finishes. These inks require UV light exposure to polymerize the ink and fully cure the image on the film surface.

- Ink Adhesion & Surface Stability: Proper drying ensures that the printed layer is smudge-resistant, fade-resistant, and stable during lamination. This step is crucial for ensuring that the graphics do not degrade during bag conversion or in end-use environments like warehouses or retail stores.

 

4) Lamination for Sunflower Seed BOPP Bag

Lamination is the process of bonding the printed BOPP film to the woven polypropylene (PP) fabric, creating a unified, durable, and visually attractive substrate. This step combines the mechanical strength of woven PP fabric with the high-gloss, photo-quality finish of printed BOPP film.

There are two main approaches depending on the bag type:

 

a. Lamination for Tubular PP Woven Bags

Tubular bags are produced using circular-woven polypropylene fabric, which eliminates the need for side seams and enhances strength. The lamination process transforms this fabric into a high-quality, printed substrate by bonding it with a BOPP film layer. Depending on product requirements, lamination can be applied to one side (front-facing) for cost efficiency or both sides for enhanced durability, moisture resistance, and full branding coverage.

 

Process:

Simultaneous Adhesive Application & Lamination

The BOPP film and tubular woven PP fabric are fed together into the lamination machine, where a polymer-based adhesive layer (typically a PE and PP blend) is extruded and applied in real time between the two materials.

As both layers pass through heated lamination rollers, the molten adhesive fuses them under precise pressure and temperature, creating a strong, wrinkle-free, and durable bond in a single continuous process.

 

Cooling & Rewinding

After lamination, the composite structure is passed through chill rollers to stabilize and cool the material. It is then rewound into rolls, ready for cutting and conversion.

 

Advantages:

Seamless structure with no side seams

High-efficiency bonding in a single pass

Strong adhesion with excellent print clarity

Moisture-resistant and ideal for outdoor or heavy-duty use

 

b. Lamination for Back Seam PP Woven Bags

Back seam bags are made from flat-woven polypropylene fabric, which is laminated in sheet or roll form and later formed into tubes with a vertical seam. This structure allows for precise registration of printed graphics and is ideal for premium, full-surface designs.

Process:

Simultaneous Adhesive Application & Lamination

The printed BOPP film and flat PP woven fabric are fed together into the lamination unit, where a molten polymer adhesive layer (typically a PE/PP blend) is continuously extruded between the two surfaces.

As the materials pass through heated lamination rollers, the adhesive creates a uniform, high-strength bond under controlled pressure and temperature. This integrated step ensures smooth, bubble-free lamination with sharp print alignment.

 

Cooling & Sheeting or Rewinding

The laminated structure is passed through cooling rollers to stabilize it before being either rewound into rolls

 

Advantages:

Enables precise alignment for full-coverage, high-resolution printing

Flexible format for block bottom or specialty bags

Ideal for products requiring strong shelf presence and visual branding

Suitable for both automated and manual bag conversion lines

 

Fabric Roll Cutting for tubular laminated PP woven fabric

• The laminated fabric is slit and cut into specific lengths, ensuring precision.
• Computer-controlled cutting machines are used to maintain dimensional accuracy and eliminate errors.
• These fabric rolls are prepared for the next stage in bag production.

Back Seam Gluing for Flat Laminated PP woven Fabric

Back Seam Preparation

• For flat fabric bags, the back-seam is formed by bringing the edges of the fabric together.
• The edges are then glued using melted PP (Polypropylene) or PE (Polyethylene) material to ensure a strong, sealed back seam.

Glue Application

• Melted PP or PE glue is applied to the edges of the fabric using a bag making machine.
• The glue is heated to the right temperature, ensuring it adheres well to the fabric without causing damage.

Pressing & Cooling

• The glued edges are pressed together to form a uniform, secure seam.
• The glued fabric is cooled to set the seam properly, ensuring durability and integrity during later stages of production.

Cutting

• Computer-controlled cutting machines are used to maintain dimensional accuracy and eliminate errors.
• These fabric rolls are prepared for the next stage in bag production.

 

 

Purpose of Gusseting

Gusseting is a crucial process in the production of Sunflower Seed BOPP Bags, particularly for bags that require added stability and capacity. Gussets are essentially folds of fabric that are pressed into the sides or bottom of the bag, allowing the bag to expand and accommodate larger quantities of product. The gusseting process enhances the structural strength of the bag and maximizes its storage capacity, making it ideal for bulk products like sunflower seeds.

 

 

Types of Gusseting

Two common types of gussets are applied to Sunflower Seed BOPP Bags depending on the design and functionality required:

- M-Gusset:

- M-Gussetting involves folding the fabric in a way that forms a distinct "M" shape when viewed from the side.

- This gusset allows the Bopp woven pp bag to expand when filled, creating a wide opening that improves product accessibility and storage efficiency.

- M-gusseted bags are typically used for products that require ease of access and optimal stacking, making them ideal for sunflower seeds, nuts, and other agricultural products.

 

- Block Bottom:

- Block-bottom gusseting involves creating a fold at the bottom of the bag that allows it to stand upright. This is especially useful when the bag needs to be stable when placed on shelves or in storage.

- Block bottom bags can have a gusset at the sides to increase capacity and ensure the bag stands with minimal tipping.

- The block bottom design is often used for products like sunflower seeds, where the bag must stand on its own without tipping over, enhancing the bag's functionality and presentation.

 

Gusseting Application Process

- The gusseting process is typically applied after the fabric has been cut into its specified lengths and before the bag is sealed.

- For M-gusseting, the side panels of the fabric are folded in such a way that when the bag is filled, the gussets expand outward, providing extra space for the contents.

- In the case of the block bottom, the gusset is folded to form a strong base, allowing the bag to maintain a sturdy, upright position.

 

Advantages of Gusseting

- Increased Capacity: Gussets provide additional space inside the bag, which allows for higher product volumes, making them suitable for bulk agricultural products like sunflower seeds.

- Better Stacking and Storage: Gusseted bags can hold more while remaining compact, making them easier to stack and transport. The block-bottom design helps the bag stay upright, while the M-gusset design allows for easier storage in tighter spaces.

- Improved Stability: Gusseting improves the overall shape of the pp woven bag, making it more stable during the filling process and ensuring the bag retains its form during transport and storage.

 

 

a. Top & Bottom Sealing

- The top or bottom of the pp woven bag are sealed using heat cutting, cold cutting, or sewing depending on the bag style.

- Options include single/double-line stitching or block bottom pasting.

b. Optional Features Integration

- Add-ons such as zipper closures, drawstrings, anti-slip coatings, micro-perforations, and PE liners are incorporated at this stage.

c. Valve or Handle Attachment (Optional)

- For specific applications, valve tops or D-cut/Plastic handles are attached.

 

 

- Each batch undergoes rigorous quality checks for:

- Dimensional accuracy

- Seal integrity

- Print clarity and color consistency

- Lamination adhesion

- Tensile strength and puncture resistance

- Bags not meeting quality standards are rejected or reworked.

 

 

- Approved bags are counted, bundled, and packed in bales or pallets.

- Protective wrapping and edge guards are added during palletization for safe transport.

- Each shipment is labeled with product details, batch number, and quantity.

 

 

- Final products are shipped to the PP woven bag import customers based on the agreed delivery schedule.

- Accompanying documents include:

- Packing list

- Invoice

- Quality certificates

- Customs documentation (if applicable)

 

 

 

Hot Tags: sunflower seed bopp bag, , , Bopp Square Bottom Bag