Raw Material Preparation
Select food-grade or standard rolled kraft paper according to practical usage demands. Feed paper stably via unwinding equipment, and correct paper deviation as well as adjust tension to fix paper position properly. Cut the paper to finished product sizes and remove defective sheets to prepare qualified raw materials. High-quality base paper fundamentally boosts the toughness and texture of finished bags. We distinguish natural kraft paper and white kraft paper for proper use, so as to meet diverse application scenarios of brown paper bag packaging.
Pattern and Text Printing
Carry out printing work in accordance with client requirements, mainly adopting eco-friendly flexographic printing together with water-based ink. Adjust printing plates and color tones, then print brand logos, texts and various patterns on paper. Conduct drying and cooling treatment after printing to prevent ink smudging and achieve clear and neat printing effects. Inks used for food packaging are odorless and fully comply with food hygiene standards. Precise color matching endows printed patterns with three-dimensional sense and greatly improves the overall aesthetic effect of brown paper bag packaging.
Bag Body Folding and Forming
Feed printed paper into forming machines to process it into continuous tubular shapes. Create gusset folds on both sides to expand internal storage space. The equipment accurately controls folding angles to produce straight bags free from wrinkles and distortions. Neat folded edges also facilitate stacking and daily storage of finished products. Integrated forming technology greatly raises production efficiency, which is perfectly suitable for mass order production.
Fixed-length Precision Cutting
Set standard specifications of bags through intelligent distance measuring systems, and cut continuous paper tubes into individual semi-finished products with high-speed cutters. All cutting edges are smooth and burr-free with unified overall sizes. Unified specifications simplify subsequent assembly and packaging procedures effectively. Automatic cutting minimizes manual errors and keeps the size of all finished products consistent.
Bottom Gluing and Sealing
Fold the bag bottoms in designated styles, evenly apply eco-friendly adhesive and press tightly by mechanical devices. After the adhesive solidifies firmly, the bottoms are completely sealed to enhance load-bearing capacity and avoid internal content leakage. This sturdy bottom structure can easily bear the weight of daily necessities. Various bottom styles are available for customized production to satisfy all kinds of storage demands.
Handle Installation
Install paper cords, cotton cords and other types of handles on handle-style bags by machine or manual work. Paste reinforcing paper around punching holes to avoid bag damage and handle falling off during lifting. Ergonomic handle design makes daily carrying more convenient. All handles are installed in precise positions to achieve harmonious appearance and excellent overall durability.
Finished Product Quality Inspection
Carefully inspect the outer appearance of bags to check defects including cracks, glue peeling and printing faults. Select product samples to conduct load-bearing and firmness tests, strictly eliminate unqualified goods and strictly control overall product quality. Multi-stage inspection procedures maintain a high qualified rate of factory-delivered products. Strict checks on both appearance and practical performance ensure full compliance with mainstream packaging industry standards.
Sorting Packaging and Shipment
Count qualified finished products, bundle them in groups and mark relevant product information before formal packaging. Store finished goods in dry warehouses properly to prevent paper deformation caused by dampness and keep products in good condition. Recheck all specifications before delivery to ensure error-free transportation and smooth delivery of goods.