Transparent film cylinders are produced from PVC, PET, PETG and APET sheets. The whole production system covers three core modules: tube rim finishing, tube body forming bonding and sealing lids.There are 4 standard rim processes, 2 mainstream bonding methods for tube bodies, and 4 categories of matching lids: blister lid, crimped paper lid, injection molded cap and metal lid. Detailed explanations are as follows:

Part 1: Four Types of Tube Rim Finishing

1. Flat Cut Edge (No Rolling Treatment)

Process: The tube opening is directly cut without thermal rolling, leaving sharp straight edges.Advantages: Consistent inner diameter without occupying internal space; bottles and rigid products stay stable inside; few production steps with the lowest processing cost.Disadvantages: Sharp edges may sc

ratch hands and matching lids; plain low-end look, mostly used for disposable cheap packaging.Application: Low-cost domestic simple cylinders, packaging without dedicated lids, cylinders for regular rigid products.

2. Single Inner Rolled Rim (Most Widely Used)

Process: Heat and press the tube edge inward to form a rounded fold hidden inside the cylinder wall.Advantages: Burr-free outer surface to prevent scratches; well fitted with most paper lids and thin matching caps for tight sealing; mature mass production with cost-performance balance, adopted by 80% regular cylinder orders in the market.Disadvantages: Inner rolling slightly reduces the inner diameter, leaving limited space for oversized products.Application: Cosmetic, toy, gift and general food transparent cylinders.

3. Single Outer Flanged Rim (Flared Horn Mouth)

Process: Thermally roll the tube edge outward to form a protruding circular flange, creating a slight horn-shaped opening.Advantages: Enlarged outer diameter enables smooth assembly and removal of lids; outer rounded flange creates strong 3D texture to upgrade packaging grade.Disadvantages: Outward protruding rims are easy to dent during stacking; more material consumption leads to higher cost than inner rolled rims.Application: High-end gift cylinders requiring frequent lid opening and fitted with large outer caps.

4. Double Rolled Edge (Thickened Dual-Layer Rim)

Process: Fold the tube edge inward first, then roll a second layer outward to form a thick double-layer rounded rim.Advantages: Greatly reinforced rim with excellent compression and drop resistance, no deformation during long-distance stacked shipment; raw cut edges fully wrapped for ultra-smooth touch, standard for luxury gift boxes.Disadvantages: Double thermal rolling doubles working hours and cost; maximum reduction of inner usable diameter.Application: Tea, wine, luxury gifts and export cylinders with strict quality standards.

Custom Variant: Wide Flange Rolled RimWider rolling width based on single inner/outer roll to fit snap caps and metal lids. It belongs to customized derivative process instead of an independent standard rim style.

Part 2: Two Tube Body Bonding Methods – Glue Bonding & RF High-Frequency Welding

1. Glue Bonding (Solvent Adhesive / PUR Hot Melt Adhesive)

Forming Principle: Overlap two sides of the film sheet and coat special adhesive. The glue dissolves plastic surface and solidifies after air drying to bond the tube body.Material Compatibility: Fully compatible with PVC; PET requires dedicated PET glue, while ordinary adhesive easily causes peeling.Advantages: Low equipment investment, flexible sampling for small batches, unlimited tube size and low unit price.Disadvantages: Volatile glue odor fails food-grade and EU export standards; raised glue lines leave obvious marks; easy delamination under high-temperature storage with poor waterproof performance.Application: Low-budget domestic PVC simple cylinders and short-cycle small-batch orders.

2. RF High-Frequency Welding (Dielectric Heat Sealing)

Forming Principle: High-frequency electromagnetic field generates friction heat inside polar PVC molecules. Overlapped plastic edges melt and fuse into an integrated seam without any adhesive.Material Compatibility: Only applicable to PVC and PETG sheets; ordinary APET/PET cannot be processed by RF welding.Advantages: Glue-free and odor-free, complying with international export environmental standards; flat transparent weld without glue marks, high bonding tensile strength and waterproof sealing; fast mass production with premium neat appearance.Disadvantages: High equipment procurement cost, only suitable for PVC material, limited maximum tube size and higher unit processing fee than glue bonding.Application: Export cosmetic & food PVC cylinders and high-end packaging for long-term storage and transportation.

Part 3: Four Supporting Lid Types for Cylinders (Blister Lid / Crimped Paper Lid / Injection Cap / Metal Lid)

1. Blister Lid

Material: Integrally stamped thin transparent plastic sheet of PVC or PET.Matching Tube Rim: Flat cut edge and single inner rolled rim.Advantages: Low price, high transparency for product display, low MOQ and fast sampling.Disadvantages: Soft texture with poor load-bearing capacity, easy to deform under pressure and average sealing performance, only suitable for short-term packaging.Application: Low-priced toys, small ornaments and disposable simple gift cylinders.

2. Crimped Paper Lid

Material: Laminated cardboard or thin iron composite crimped lids, divided into paper crimped lids and iron-ring paper lids.Matching Tube Rim: Single inner rolled rim (the mainstream matching solution in industry).Advantages: Light weight, customizable full-color printed logos, moderate cost and fast delivery.Disadvantages: Weak waterproof and moisture-proof performance, easy to soften and deform when damp, average load capacity.Application: Beauty products, snacks, stationery and regular gift cylinders, the top choice for domestic circulation packaging.

3. Injection Molded Cap

Material: Rigid solid plastic integrally injection molded from PP or ABS. Snap or threaded structures are available.Matching Tube Rim: Outer flanged horn mouth and wide inner rolled rim.Advantages: High hardness and extrusion resistance, strong sealing, reusable for repeated opening, waterproof and moisture-proof, available with matte, solid color, electroplating and other surface finishes.Disadvantages: High mold opening cost, cost-effective only for mass production with high unit cost for small orders.Application: High-end skincare products, maternal & infant goods, reusable storage cylinders and cross-border e-commerce gift boxes.

4. Metal Lid

Material: Stamped tinplate or aluminum alloy, including flat lids, screw caps and snap metal lids.Matching Tube Rim: Double rolled edge and wide outer thickened flanged rim.Advantages: Luxurious texture, compression and rust resistance, top-tier sealing performance, greatly upgrading the grade of gift sets and suitable for long-term storage.Disadvantages: Highest unit price, heavy weight increases transportation cost.Application: Tea, red wine, health supplements, luxury souvenir gifts and high-end export gift cylinders.

Complete Process Matching Selection Guide

Low-cost domestic small PVC orders: Flat cut / Inner rolled rim + Glue bonding + Blister lid / Crimped paper lid

Mass domestic beauty & gift orders: Single inner rolled rim + RF welding + Color printed crimped paper lid

Cross-border e-commerce & reusable packaging: Outer flanged horn rim + RF welding + Injection snap cap

Luxury export gift sets for wine & tea: Double thickened rolled rim + RF welding + Metal screw lid

Food-grade PET cylinders (not compatible with RF welding): Inner / Double rolled rim + Dedicated PET glue bonding + Injection cap / Metal lid