Waterproof packaging box refers to plywood used as packaging materials. The wooden materials used for packaging shall comply with several basic principles. Many uses of packaging boards are disposable and cannot be recycled, so the attention to cost is high. Low-cost wood is the target of the packaging board manufacturers. Poplar is the first to enter the field of packaging board materials. Now let's know whether waterproof packaging boxes can really be waterproof!
1、 Use of waterproof packaging box
The transportation of aquatic products has always been a difficult problem in the industry. The traditional way of packaging aquatic products with plastic bags is not only unattractive, but also unable to add value to the brand. The appearance of waterproof cardboard box has solved the brand effect brought by aesthetics and transportation.
2、 Hope that the solution of waterproof and moisture-proof carton
1. heavy size carton board
In the paper making process of carton board, water droplets can penetrate into the surface within 5 minutes by applying severe size on the surface of the carton board. Generally, a large amount of water resistant additives such as urea resin, melamine formaldehyde resin and polyvinyl butyral are added to the starch paste. However, the cost of this water-resistant agent is high, and it is easy to cause problems such as the opening of the corrugated board during the manufacturing process.
2. Coated paper
Thin film paper is a composite material that uses a casting machine to coat plastic particles on the surface of the paper. Its main characteristics are oil-proof, water-proof and hot-melt. However, due to the high cost, it is not conducive to the widespread popularity in the packaging industry.
3. Hydrophobic corrugated board
It is a process of coating low surface energy substances such as polylactic acid (PLA), polyolefin, polycarbonate, polyamide, polyester, molten paraffin on the surface of cardboard to change the surface roughness and surface morphology of the material. When the waterproof corrugated paper is wetted by water, the lotus leaves will become dripping, and the water will become dripping and will not penetrate into the inside of the corrugated paper. It is very cheap and suitable for packaging dry powder, especially the powder that is easy to solidify after absorbing water. It is also applicable to the packaging of goods that frequently enter and leave the refrigerator. After being taken out of the refrigerator, it is easy to condense on the box wall. The waterproof processed cardboard will not significantly reduce the compressive strength before the dew evaporates, and can effectively protect the goods.
4. Prevent (hide) corrugated cardboard)
Also known as waterproof or waterproof paperboard, its surface is almost impermeable in contact with water all year round, but it cannot be immersed in water. Otherwise, the waterproof effect will be lost. Water-resistant paperboard usually uses curtain coating method to coat the fused synthetic resin or paraffin mixture on the surface of corrugated paperboard to form a resin film or wax film. It must also be coated on both sides.
Water-proof paperboard is mainly used for packaging salted products, frozen foods, fruits and vegetables. Due to the soft paraffin layer on the surface of corrugated paper, it is also suitable for packaging high-gloss furniture, piano, treasury, machinery, etc. that are easy to scratch.
The waterproof packing box cannot be made of poplar. Strictly speaking, all corks cannot be used. So, what kind of wood is used for waterproof packaging board? The answer is high-density wood, usually birch, beech, etc. However, these wood costs are high, and only items with long durability can be considered.