Kraft Paper Range

1. Paper Conditioning and Moisture Management

Paper is hygroscopic: it absorbs or releases moisture as surrounding relative humidity changes. Moisture variation can affect sheet dimensions, curl, print registration, crease quality and adhesive bonding. 

A practical manufacturing control plan includes:

• Checking incoming paper against the approved grade, basis weight, caliper and supplier documentation.
• Conditioning materials to a suitable production environment before printing, die-cutting or forming.
• Monitoring paper curl, dimensional variation and crease cracking during converting.
• Checking adhesive curing and bonding strength before packing.
• Allowing finished products to stabilise under suitable storage conditions before shipment.

For long-distance sea freight, packaging should be protected against condensation, wet cartons, container leaks and large temperature changes. Desiccants may be used when justified by the product and shipping risk assessment, but there is no universal desiccant-to-carton ratio. The quantity should be calculated according to the moisture load, packaging permeability, container conditions and voyage duration.

2. Printing, Die-Cutting and Structural Accuracy

Custom kraft paper packaging can be produced in different shapes and formats, including shopping bags, food pouches, folding cartons, beverage cups and gift boxes.

The manufacturing process may include:

• Printing: Confirming artwork dimensions, colour references, ink coverage and print registration before the production run.
• Die-cutting: Checking the cutting layout, fold positions, locking tabs and waste removal.
• Folding and gluing: Verifying glue-line placement, joint strength and the repeatability of the folding sequence.
• Window installation: Checking window alignment, adhesive coverage and bond integrity for pouches or boxes with transparent panels.
• Cup forming: Inspecting rim formation, side seams, base joints and lid fit where applicable.

For custom products, dimensional tolerances should be agreed in the approved drawing or signed sample specification. A universal ±0.3 mm tolerance should not be applied to all paper packaging because flexible paper, board, formed cups and sealed pouches have different manufacturing characteristics.

3. Surface Treatments, Coatings and Food-Contact Materials

The surface treatment must match the packaging's intended use. Uncoated kraft paper may suit certain dry goods and secondary packaging applications, while liquid or greasy foods may require a functional barrier layer.

No coating should be described as universally food-safe, biodegradable or compostable without evidence covering the relevant formulation and finished packaging structure. The same applies to claims such as PFAS-free, plastic-free and recyclable. 

4. Export Carton and Transit Protection

Packaging for bulk shipment must protect the product while using container space efficiently. The export packing plan should be developed around the finished product's shape, stackability and susceptibility to compression or moisture.

Recommended checks include:

• Selecting a suitable export carton grade based on gross weight, stacking height and distribution conditions.
• Separating products where surface abrasion, print transfer or deformation is a concern.
• Using moisture-resistant outer protection where the shipping environment requires it.
• Securing cartons on pallets when the destination and transport method permit.
• Confirming carton markings, quantities, gross weight, net weight and pallet dimensions before dispatch.
• Conducting transit or drop testing when required by the buyer's distribution channel.

For Amazon FBA or other e-commerce fulfilment programmes, the finished package should be assessed against the applicable current fulfilment and shipping requirements. ISTA 1A or ISTA 3A testing may be appropriate depending on the distribution environment and test objective. Neither standard should be claimed as passed unless a corresponding test has actually been completed and documented.