Answers to frequently asked questions about the craftsmanship and material of paper trays (1)

1. What are the types of raw materials for paper trays?

Answer: There are two more common types; one is raw paper pulp (for example: raw wood pulp, bamboo pulp, sugarcane pulp, straw pulp, etc.). The second category is the recycling category (for example: corrugated paper, newspaper, white edge paper). In addition, it is also effective to produce colored paper tray products with different color quality base papers according to customer requirements.

2. Why is the net weight of paper tray products inconsistent?

Answer: First, the pulp consistency is changing. When the prepared pulp of a certain concentration is produced during the production process, as the formed paper support leaves the molding machine's pulp tank, the pulp concentration begins to change, and is generally controlled between 2.56% and 3.6%. The second is that the vacuum is constantly changing. In the molding process, the negative pressure value of the negative pressure tank loaded by the air compressor is also variable as the production progresses. The superposition of the two variables causes the weight of the paper tray formed by the same suction time to vary between ±10%.

3. Why can't you or can't do the color I need?

Answer: In the dyeing of paper tray 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. (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 is your product not smooth and tidy than that product?

Answer: After the paper support product is formed, it will be deformed after the drying process. The high temperature (150°～250°) and high pressure (3T～50T) of the plastic mold are used to restore the original design geometry. Because the plastic mold is The upper and lower 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, the smaller the plane, and the more spherical arcs, the more smoothness decreases after shaping. This is the result of the process.