In recent years, the packaging industry has developed rapidly, and as an indispensable packaging material, it has also ushered in a broad market. At present, the environmental protection paper tray has gradually replaced many traditional packaging in the market, and it has great advantages in terms of practicability, environmental protection, and resource saving. At the same time, people's needs continue to diversify, and higher demands are placed on the packaging market. To this end, the composition of the raw materials must be very stable, so what are the common problems with customized environmentally friendly paper trays? The editor of Mingfeng Packaging will introduce to you.
What are the common problems of customized eco-friendly paper trays:
1. What are the types of environmentally friendly paper tray raw materials?
is more common in two categories; one is raw pulp (such as: raw wood pulp, bamboo pulp, sugar cane pulp, straw pulp, etc.). The other is the recycling category (such as: corrugated paper, newspaper, white edge paper). In addition, different colored base papers can be used to produce colored paper tray products according to customer requirements.
Environmental protection paper tray
2. Why is the weight of the paper support products inconsistent?
There are two main reasons for , one is that the pulp consistency is changing. When the prepared pulp with a certain concentration is produced during the production process, as the formed paper tray leaves the forming machine's pulp tank, the pulp concentration begins to change, and is generally controlled between 2.56% and 3.6%. Second, the vacuum is constantly changing. The negative pressure value of the negative pressure tank loaded by the air compressor in the molding process is also variable as the production progresses. The superposition of the two variables results in the weight of the paper tray formed at the same suction time of ±10 Change between %.
3. Why can't you do some colors or do not do well?
In the dyeing of paper support products, water-based dyes are mostly added in the pulping process based on the original pulp. One is that the concentration of the slurry also changes as the production progresses, and the second is that most dyes are sensitive to temperature (in During the drying process, the color changes with the temperature of the drying line, and the temperature of the mold is 150°～250° during hot pressing and the dye will also change at different temperatures). In summary, products with higher color requirements should not be dyed.
4. Why are the products not smooth and tidy?
After being molded, the environmentally friendly paper support products will be fully wet and will be deformed after the drying process, and then use the high temperature (150°～250°) and high pressure (3T～50T) of the plastic mold to restore the original design geometry. Because the plastic mold is The upper and lower clamping molds are subjected to vertical force, so the plane position is strong, the paper holder appears smooth, and the inclined surface is not easy to receive force and appears slightly rough. According to the actual requirements of product design, the smaller the inclined surface, the more ribs, and the smaller the plane. The more spherical arcs, the more the smoothness will decrease after shaping. This is the result of the process.
5. Why are there tiny cracks on the surface of the product?
When the environmentally friendly paper tray products are formed, the pulp fibers are naturally adsorbed layer by layer, and the liquid pulp will not flow out in some grooves, which will cause the thickness of the paper tray to be different from the standard thickness in the design after drying. Error, when receiving a strong external force during high-pressure shaping, some fibers in the outer layer will be broken at the uneven thickness of the inner and outer parts, which will appear as tiny cracks from the surface. This phenomenon will not affect the strength of the paper tray packaging, so it is acceptable in the industry.
The above content is an introduction to the common problems of customized environmentally friendly paper trays. Environmentally friendly paper trays have loose materials and unique egg-shaped curved structures, and have better air permeability, freshness retention, and excellent cushioning and positioning. Function, especially suitable for mass transportation and packaging. Nowadays, the development and continuation of environmental protection paper support in our country has put forward a good point of view, which has played a guiding role for the development direction of my country's paper support environmental protection cause.
