Method for preparing shaving board through microwave preheating
A particleboard and microwave technology, which is applied in the field of particleboard preparation using microwave preheating, can solve the problems of weakening the effect and effect of microwave preheating, and achieve the effects of ensuring the effect, increasing the microwave preheating temperature, and good static bending strength
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Embodiment 1
[0040] refer to figure 1 The shown preparation method of particleboard is a continuous particleboard preparation method, which sequentially includes a particle preparation section, a particle drying section, a sizing section, a pavement forming section, a microwave preheating section, and a hot pressing section.
[0041] Shaving preparation section
[0042] Using small-diameter grades, branches, or processing residues as raw materials, the chipping unit 100 in the prior art is used to produce flakes by chipping. The flakes are then screened into two parts: small flakes and medium / large flakes. Among them, the length of small flakes is 30mm to 60mm, the width is 5mm to 10mm, and the thickness is 0.2mm to 0.8mm, and the length of medium / large flakes is 70mm to 100mm, the width is 15mm to 20mm, and the thickness is 1.0mm to 1.5mm. Small flakes and medium / large flakes are transferred to the two shavings drying sections 200a, 200b through different conveying channels.
[0043] S...
Embodiment 2
[0058] The difference between embodiment 2 and embodiment 1 is:
[0059] In one shaving drying section 200a, small flakes are dried to a moisture content of 4.5%, and in another shaving drying section 200b, medium / large flakes are dried to a moisture content of 1.5%. After drying, the moisture content of small flakes and medium / large flakes has a 3% deviation. The temperatures at the exits of the two shavings drying sections 200a and 200b are both 57°C to 59°C.
[0060] In one sizing section 300a, the temperature of the small flake shavings entering the sizing section 300a from the shavings inlet is 57°C to 59°C, and the temperature of the adhesive entering the sizing section 300a from the adhesive inlet is 52°C to 54°C. There is a temperature difference of 5 ℃, and the moisture content of the small flake shavings after mixing is 12%. In another sizing section 300b, the temperature of the medium / large flakes entering the sizing section 300b from the shavings inlet is 57°C to...
Embodiment 3
[0063] The difference between Example 3 and Example 1 is:
[0064] In one shaving drying section 200a, small flakes are dried to a moisture content of 5%, and in another shaving drying section 200b, medium / large flakes are dried to a moisture content of 1.5%. After drying, the moisture content of small flakes and medium / large flakes had a deviation of 3.5%. The temperatures at the exits of the two shavings drying sections 200a and 200b are both 59°C to 61°C.
[0065] In one sizing section 300a, the temperature of the small flake shavings entering the sizing section 300a from the shavings inlet is 59°C to 61°C, and the temperature of the adhesive entering the sizing section 300a from the adhesive inlet is 54°C to 56°C. There is a temperature difference of 5 ℃, and the moisture content of the small flake shavings after mixing is 13%. In another sizing section 300b, the temperature of the medium / large flakes entering the sizing section 300b from the shavings inlet is 59°C to 61...
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