Paper tray factory-paper tray FAQs (1)

    The pulp molded products of the paper tray factory are made of plant fiber pulp or waste paper products that can be completely recycled and reused as basic materials, and are made of unique technology and are widely used for food (medicine) storage and electrical packaging. , Pollution-free technological green products in the fields of planting seedlings, medical utensils, handicraft blanks and fragile liner packaging.

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

Answer: The more common ones are divided into two categories; one is raw paper pulp (such as: raw wood pulp, bamboo pulp, sugarcane pulp, straw pulp, etc.). The second category 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.
    2. Why is the weight of the paper tray products inconsistent?

Answer: One is that 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 pulp tank of the forming machine, 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 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 designed geometric shape, due to the plastic mold 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 will decrease after shaping. This is the result of the process.

 

    5. Why are there slight cracks on the surface of this product?

Answer: When the paper pallet product is formed, the pulp fibers will naturally gather together layer by layer. The liquid pulp will not flow out in some grooves, which will cause the thickness of the different positions of the paper tray to be different from the design standard thickness after drying. Then, when the paper disc is squeezed by a strong external force during the high-pressure forming process, the outermost fibers with uneven inner and outer thickness will break, and small cracks will appear from the surface. This phenomenon will not affect the strength of the paper tray packaging, so it is acceptable in the industry.

 


Post time: Dec-01-2021