Method of manufacturing pulp mold formed product
A manufacturing method and manufacturing device technology, applied in packaging, container handles, transportation and packaging, etc., can solve the problems of low drying efficiency, inability to control the wall thickness of formed products, and large errors in product shape and dimensional accuracy.
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Embodiment 1～5
[0130] A bottle-shaped molded article was formed by the method shown in FIG. 1 . The pulp details of the pulp liquor used are shown in Table 1 below. The quality of formability during molding is also shown in this table. In Table 1, the LBKP used in Examples 1 to 4 is OA waste paper, the amount of pure (virgin) pulp is large, and the freeness value is small. The LBKP used in Example 5 is "Senebra (Senebura, trade name)", the amount of pure pulp is small, and the amount of recycled pulp is large, so the freeness value is large.
[0131]
average fiber
length (mm)
free
degree (cc)
Fiber Length Number Distribution
(%)
shaped body
the formation of
sex
Range A
Range B
Reality
apply
example
1
1.50
390
43.4
28.5
good
2
NBKP / LBKP *1
70 / 30 *2
1.29
350
57.5
22.0
...
Embodiment 6～9
[0138] From the pulp liquid inlet of the molding die shown in Figure 13, the pulp liquid for the outermost layer containing 1.0% by weight of pulp fibers having the physical properties shown in Table 2 was injected into the cavity under pressure at 0.3 MPa. . Dehydration is carried out in the cavity and an outermost layer made of pulp liquid is formed on the inner surface of the cavity. Further, simultaneously with the formation of the outermost layer, a pulp solution for the innermost layer containing 1.0% of pulp fibers having physical properties shown in Table 2 was injected into the cavity under pressure at 0.3 MPa. Then press air into the cavity at a pressure of 0.1 MPa from the pulp liquid inflow port of the forming mold, and form a continuous compounding of the pulp liquid for the outermost layer to the pulp liquid for the innermost layer on the outermost layer. A mixed layer whose composition is changed, and an innermost layer made of pulp liquid for the innermost lay...
Embodiment 10
[0141] Except that after injecting the pulp liquid for the outermost layer into the cavity and completely forming the outermost layer, injecting the pulp liquid for the innermost layer into the cavity and forming the innermost layer on the outermost layer, the rest are the same as in the embodiment. 6. A bottle former is obtained in the same manner. In this molded article, there is no mixed layer between the outermost layer and the innermost layer. The molded article was subjected to the same measurement as above. The results are shown in Table 2.
[0142] From the results in Table 2, it can be seen that the molded articles of each embodiment formed with a pulp solution containing specific pulp fibers, the innermost layer and the outermost layer of the pulp fibers having specific physical properties can prevent cracking and uneven thickness during molding (i.e. The thickness is less than 1 / 2 of the average thickness of the molded product or the thickness difference that can ...
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Abstract
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