How To Make Egg Cartons
- Feb 04, 2018 -

How to make egg cartons (PULP MOLDING)?

Environmental protection PULP MOLDING replaced the foam styrofoam, blister and other packaging products, but also slowly into the day-to-day production of life, its development has also complied with the national development policy, is to provide a little reference for the entrepreneurial friends.

     The study of paper is called pulp molding, English name: Molded PULP packaging, abbreviation MPP. The most common is to pack the eggs of the pulp tray, so also called egg, it is used to scrap newspapers, cardboard box scraps, recycled paper tube, the original wood pulp board or sugarcane pulp residue as raw materials, through the hydraulic slurry, batching and other processes into a certain concentration of slurry, slurry in a special metal mold by vacuum adsorption into wet billet products, The Wet billet product is a kind of pulp product which is made by drying and pressing the whole type.     

     The study of paper is called pulp molding, English name: Molded PULP packaging, abbreviation MPP. The most common is to pack the eggs of the pulp tray, so also called egg, it is used to scrap newspapers, cardboard box scraps, recycled paper tube, the original wood pulp board or sugarcane pulp residue as raw materials, through the hydraulic slurry, batching and other processes into a certain concentration of slurry, slurry in a special metal mold by vacuum adsorption into wet billet products, The Wet billet product is a kind of pulp product which is made by drying and pressing the whole type.

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Tools/raw Materials

Scrap newspaper, carton scraps, recycled paper tube;

Raw wood pulp board, sugarcane pulp residue;

Mold (sub-forming water mold, hot-pressing shaping mold, trimming die)

Method/Step1

"Ready for waste paper, molds"

Figure 1 Cartons of scrap

Figure 2 Raw wood pulp and sugar cane pulp produced by white paper

Figure 3 Hot pressing mold

Figure 4 Hot pressing steel die

Figure 5 Aluminum alloy water model

 

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"Make the waste paper into a pulp."

Figure 1   Select the waste paper to be used

Figure 2   Vertical Hydrapulper

Figure 3   Pulp for use

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2. "Compounding pulp and adjusting pulp concentration"

Figure 1 Preparation of pulp

Figure 2 Adjust pulp and supply pulp

Figure 3 Water adjustment concentration

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3.    4

"Through pipes, circulatory systems, slurry feeding to the barrel of the forming machine, recycled pulp and recycled water."

Figure 1 Pulp pipe

Figure 2 Vacuum tank with negative pressure

Figure 3 White pulp pulp barrel

Figure 4 Circulating water

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[Forming a wet blank by water model]

Figure 1 Artificial connection

Figure 2 Wet blank paper transfer

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Drying

Figure 1 Drying line of firewood or electric or natural gas

Figure 2 Drying the wind with the sun

Figure 3 In high humidity with hot pressing die directly to the wet paper tray dry, mainly for wet pressing process

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 "Hot Pressing and trimming"

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6. [Inspection, Packing, Warehousing]

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Precautions

Paper egg tray weight will have a 10% positive and negative tolerance. One reason is that the pulp concentration is changing. With a certain concentration of pulp in the production process with the forming of a good paper from the molding machine slurry cylinder, pulp concentration began to change, generally controlled between the 2.56%~3.6%. The second is that the vacuum is constantly changing. Forming process Hollow press load of negative pressure tank with the production of negative pressure value is also variable, the superposition of two variables will lead to the same suction time formed by the weight of the paper ±10% between the changes.

 

The surface of the paper egg tray is more or less slightly cracked. Paper-supporting products formed when the pulp fiber is formed into a layer of natural adsorption, the liquid pulp will not flow out in some grooves, resulting in the thickness of the paper after drying different positions and the standard thickness of the design when the error, then in the high-pressure plastic surgery when a strong external pressure, internal and external thickness of the outermost part of the most fiber will break, Visible from the surface as microscopic cracks. This phenomenon will not affect the paper packaging strength, so in the industry is acceptable.