CN101634124A - Method for preparing special pulp moulding plate with convex part and mould - Google Patents

Abstract

The invention discloses a method for preparing a special pulp moulding plate with a convex part and a mould. The preparation method is characterized in that the water squeezing moulding on the convex part of the special (non-flat) pulp moulding plate adopts a flexible mould method; the mould used is characterized in that: the mould is provided with a cavity according to the shape of the convex part of the special (non-flat) pulp moulding plate, and the center of the cavity is provided with a flexible punch device which has the minimum initial volume and applies pressure on peripheral pulp or paper fibers when the volume is expanded; the prepared pulp moulding plate is characterized in that: the plate has a non-flat and special shape, and is provided with at least one convex part; the ratio of the height of the convex part to the minimum caliber of the convex part is more than 0.3; and the weight per unit area of the plate is more than 0.30 gram per square centimeter, and the density of the plate is more than 0.6 gram per square centimeter. The method enables the manufacture of super-thick and high-density special pulp moulding products to be possible, simplifies process and reduces cost; and the products have good comprehensive usability. The special pulp moulding plate can be widely used in the fields such as industrial packaging, storage and transportation, buildings, decoration, office equipment and products and the like, and has great market potential.

Description

The preparation method and the mould of the special pulp moulding plate of band bossing

Technical field

The present invention relates to the preparation method and the mould of pulp moulding plate, relate in particular to a kind of preparation method and mould therefor thereof of the special pulp moulding plate with bossing.

Background technology

With waste paper is that raw material is made various sheet materials, be used as industrial packing accumulating material, constructional ornamental material etc., have good economic benefit and social benefit, the inventor's who is put down in writing as publication number CN101070688A patent of invention " preparation method of pulp moulding plate and mould therefor thereof ".But the disclosed technology of this patent is unsuitable for the making with the special pulp moulding plate of bossing: when the lowest calibre of the height of bossing and bossing bigger (as greater than 0.3), the parallel motion component of relative motion will cause the paper fiber pad between the punch-die to be broken between punch and die surface, cause the wall unevenness of bossing even and the brisement of vertical and horizontal arranged.

Summary of the invention

Can't satisfy the making requirement of the special pulp moulding plate of band bossing in view of prior art, the present invention is intended to propose a kind of water squeezing of the bossing that can make special pulp moulding plate and is molded under the forward extrusion and carries out (promptly in extrusion process between the punch-die surface opposing parallel component motion be approximately zero), thereby the forming method of the laminated fiber structure of acquisition even compact, simultaneously production mould is done corresponding improvement, obtain special pulp moulding plate, the pulp moulding plate goods are firmer, cost is cheaper, purposes is more extensive thereby make.

Technical solution of the present invention is achieved in that

1, a kind of preparation method of pulp moulding plate, its technology comprises smashing after waste paper soaked makes the step that concentration is not more than 6% paper pulp, mold pressing squeezes the water out and the step of moulding, the step of the demoulding and dryness finalization, it is characterized in that water squeezing moulding to the bossing of special-shaped (non-flat) pulp moulding plate, adopt the flexible die method, promptly when the rigidity die surface of bossing lamination during the paper fiber of q.s, order is placed in the variable volume of rigidity die center, the flexible punch of initial volume minimum expands, do not begin as yet towards periphery the residue paper pulp of lamination and the moisture higher paper fibrage of lamination exert pressure, finish the water squeezing forming step of bossing.

2, a kind of mould for preparing pulp moulding plate by the described method of claim 1, comprise and enclose frame, briquetting reaches the die cavity that is made of above-mentioned three with the cover plate that has the gutter, briquetting under the effect of die cavity internal motivation device to cover plate direction motion with extruding paper pulp in moisture make it moulding, it is characterized in that the bossing shape by the abnormal shape that will make (non-flat) pulp moulding plate has die on the cover plate, central authorities at die, be equipped with by rubber bag tank, the initial volume minimum that fixing plug and force pipe are formed, the flexible convex die device that peripherad paper pulp of volumetric expansion or paper fiber are exerted pressure behind the charged pressure fluid, the flexible convex die device can be installed in the die bottom, also can be installed on the briquetting, position and corresponding section, die center.

3, a kind of by the described method of claim 1 and use the pulp moulding plate of the described mould of claim 2 preparation, it is characterized in that described pulp moulding plate is shaped as non-flat abnormal shape, has at least one place bossing, the ratio of the height of bossing and the lowest calibre of bossing is greater than 0.3, the weight per unit area of sheet material greater than the density of 0.30 gram/square centimeter and sheet material greater than 0.6 gram/cubic centimetre.

Compared with prior art, advantage of the present invention is conspicuous:

1, the present invention has successfully solved the making difficult problem of the special pulp moulding plate that has bossing;

2, the application example of special pulp moulding plate that has bossing is as " one-body molded pulp molding pallet ", and its bed board and supporting leg are one-body molded, thereby (1) has further reduced the manufacturing cost of paper substrate pallet; (2) linking intensity between supporting leg and the bed board is higher than the connecting mode of stitching or gummed far away; (3) make the support holder structure form simplify, make the pallet manufacture craft to simplify most most, improved the production efficiency of pallet simultaneously greatly.

Description of drawings

2 in accompanying drawing of the present invention, that is:

Fig. 1 has the die cut view of the special pulp moulding plate of bossing for making of the present invention.

Among the figure, 1, cover plate; 2, the gutter on the cover plate; 3, enclose frame; 4, die cavity; 5, briquetting; 6, the last osculum of briquetting; 7, die; 8, rubber bag tank; 9, fixing plug; 10, force pipe

Fig. 2 is the profile of a specific embodiment that has the special pulp moulding plate of bossing.

The specific embodiment

Now in conjunction with Fig. 1 preparation method of the present invention and mould are done further and specified: enclose frame 3 and be fixed on the shaped device frame, cover plate 1 can move up and down under the depression bar effect, opens or seal that to enclose frame 3 suitable for reading; Briquetting 5 moves up and down enclosing in the frame 3 under the effect of push rod, briquetting 5 and enclose movable sealing between the frame 3 have enough withstand voltage, to guarantee that paper pulp can not leak in self sealss place when the water squeezing moulding.Cover plate 1 moves downward sealing and encloses frame 3 when suitable for reading, encloses the die cavity 4 that frame 3, cover plate 1 and briquetting 5 threes form a spatially-variable, and the molded surface of its cover plate 1 and briquetting 5 is covered with filter screen.

Open with briquetting 5 when cover plate 1 and to be in when enclosing in the frame 3 the below, in enclosing frame 3, inject the paper pulp of quantitative finite concentration (being not more than 6%), cover plate 1 moves downward sealing to enclose frame 3 suitable for reading then, briquetting 5 begins to push paper pulp under the effect of push rod, water in the paper pulp is discharged by osculum 6 on the briquetting 5 and the gutter on the cover plate 2, and the paper fiber is along the molding surface lamination.When the paper fiber that lamination is enough of 7 surfaces of the die on the cover plate 1, fluid with certain pressure makes its expansion in force pipe 10 and fixing plug 9 charge into the rubber bag tank 8 of flexible punch, to around as yet not the paper pulp of lamination and the high aqueous paper fiber layer of lamination exert pressure, with moulding and the water squeezing of finishing the special pulp moulding plate bossing.After flexible punch expansion was exerted pressure, briquetting 5 continued the extruding paper pulp, and the water squeezing forming process of the non-bossing of sheet material is carried out synchronously.When the pressure of paper pulp in the die cavity 4 during greater than the pressure of rubber bag tank 8 inner fluids, the volume of rubber bag tank 8 is up and shrink gradually along with briquetting, until special pulp moulding plate integral body all by even extrusion modling.

Discharge the fluid pressure in the flexible punch, compressed air makes the wet base (moisture about 50%) of sheet material of moulding break away from briquetting 5 by the osculum 6 on briquetting 5 surfaces when opening cover plate 1, and the compressed air that is imported by gutter on the cover plate 2 again after together rising with cover plate 1 blows off (to draw on the figure) to bearing plate and migrates out, through air dry or/and hot-pressing drying has promptly been finished the preparation of special pulp moulding plate.

Can lift " one-body molded pulp molding pallet " as the example that has the special pulp moulding plate of bossing of the present invention and be example, Fig. 2 is a kind of profile of one-body molded pulp molding pallet, bed board 21, supporting leg 22 is one-body molded with reinforcement 23, its least unit area weight=0.56 gram/square centimeter＞0.30 gram/square centimeter, supporting leg is a truncated cone-shaped, the height with at the bottom of the round platform footpath ratio=0.6＞0.3.

Claims (3)

1, a kind of preparation method of pulp moulding plate, its technology comprises smashing after waste paper soaked makes the step that concentration is not more than 6% paper pulp, mold pressing squeezes the water out and the step of moulding, the step of the demoulding and dryness finalization, it is characterized in that water squeezing moulding employing flexible die method to the bossing of special-shaped (non-flat) pulp moulding plate, promptly when the rigidity die surface of bossing lamination during the paper fiber of q.s, order is placed in the variable volume of rigidity die center, the flexible punch of initial volume minimum expands, do not begin as yet towards periphery the residue paper pulp of lamination and the moisture higher paper fibrage of lamination exert pressure, finish the water squeezing forming step of bossing.

2, a kind of mould for preparing pulp moulding plate by the described method of claim 1, comprise and enclose frame (3), briquetting (5) and the die cavity (4) that has the cover plate (1) of gutter (2) and constitute by above-mentioned three, briquetting (5) under the effect of die cavity (4) internal motivation device to cover plate direction motion with extruding paper pulp in moisture make it moulding, it is characterized in that the bossing shape that cover plate (1) is gone up by the abnormal shape that will make (non-flat) pulp moulding plate has die (7), central authorities in die (7), be equipped with by rubber bag tank (8), the initial volume minimum that fixing plug (9) and force pipe (10) are formed, the flexible convex die device that peripherad paper pulp of volumetric expansion or paper fiber are exerted pressure behind the charged pressure fluid, the flexible convex die device can be installed in die (7) bottom, also can be installed on the briquetting (5), position and die (7) corresponding section, center.

3, a kind of by the described method of claim 1 and use the pulp moulding plate of the described mould of claim 2 preparation, it is characterized in that described pulp moulding plate is shaped as non-flat abnormal shape, has at least one place bossing, the ratio of the height of bossing and the lowest calibre of bossing is greater than 0.3, the weight per unit area of sheet material greater than the density of 0.30 gram/square centimeter and sheet material greater than 0.6 gram/cubic centimetre.

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