TWI608144B - Wet pulp molding method and paper-shaped object made thereby - Google Patents

Description

Wet paper forming method and paper-plastic product

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a wet paper forming technique, and more particularly to a wet paper forming method for accelerating the drying forming efficiency of a wet paper blank body to shorten the wet paper forming process time and a paper product thereof.

The pulp molded product (or paper-plastic product) is obtained by using a pulp fiber as a main raw material, and the pulp fiber is hot-pressed by a molding die, and can be divided into two technologies of dry paper forming and wet paper forming. Paper-plastic products can be made into packaging containers or separators of goods in the packaging of goods or packaging containers, which gradually replace the sponges or foams that are traditionally used for protection and shock-proof on inner packagings or outer packagings. Therefore, the packaging containers and barrier materials used in electronic products on the market are gradually replacing the materials of conventional foamed plastics with paper-plastic products.

The conventional wet paper forming process for manufacturing paper and plastic products mainly comprises a slurrying step and a hot pressing step, wherein the slurrying step is to pass the pulp material body (including pulp) by a lower mold in a pair of upper and lower mold assemblies. The fiber and various additives are taken out from the pulp slurry tank to form a layer of wet paper embryo body, and then the hot pressing step is to heat the wet paper embryo body disposed between the mold components through the mold assembly. After pressurizing the mold for a period of time, a pulp semi-finished product is obtained after the humidity of the wet paper body between the mold components is lowered to the desired humidity/dryness. The receiver then manually manipulates another shaping machine to cut the excess burrs in the semi-finished product of the pulp to complete the finished product.

However, since the above-described conventional wet paper plastic manufacturing process only reduces the humidity contained in the pulp by a hot pressing step. After the mold completes the pulping step of the pulp, the wet paper body in the lower mold contains a high proportion of moisture (more than 50% of the total weight), which makes it takes a lot of time to remove the pulp in the subsequent molding step. Moisture, such as the process of removing the moisture content of the wet paper body by a hot pressing step, takes about 160 seconds to obtain each pulp semi-finished product/finished product. This is quite time-consuming in mass production processes for mass-produced paper-plastic products, making the productivity of paper-plastic products inefficient. Moreover, if the force and temperature of the hot pressing between the mold components are increased in order to quickly remove the moisture in the wet paper body, the pulp semi-finished product may not be able to withstand the rapid clamping pressure between the mold components and the heating temperature rises too fast. As a result, the semi-finished structure of the pulp is broken, resulting in a decrease in yield and difficulty in meeting economic benefits.

Therefore, it is urgent to shorten the time of the hot pressing step in the wet paper and plastics manufacturing process and maintain the integrity of the semi-finished/finished product of the pulp.

In order to solve the above problem that the hot pressing step in the conventional wet paper forming process is too time consuming to lengthen the overall process time so that the mass production speed is too slow and the production yield is too low, one of the main objects of the present invention is to provide a wet paper plastic. A molding method for automatically molding a pulp material into a dried paper-plastic product.

Another object of the present invention is to provide a wet paper forming method for improving the dry forming rate of a wet paper blank body, thereby accelerating the mass production speed of the paper plastic product, wherein the first set of upper and lower molds are used for the slurrying step. The wet paper embryo body and the first pre-pressing step of the wet paper embryo body, that is, first discharging a certain amount of moisture in the wet paper embryo body to form a first semi-finished product, and compacting the pulp fiber of the first semi-finished product, and then utilizing The second group of upper and lower molds performs the first semi-finished product a pre-pressing step to form a second semi-finished product to further discharge the moisture contained in the second semi-finished product before the hot pressing step, thereby avoiding the rapid heating and pressurization of the semi-finished product with high water content during the hot pressing process to cause the semi-finished product to be broken, and then The third group of upper and lower molds are heated by the hot pressing step while being pressed together to discharge the remaining moisture, thereby achieving the effect of rapid drying and shortening the time taken for the pulp to dry, so that the efficiency can be effectively increased and the yield can be increased.

In order to achieve the above object, the present invention provides a wet paper forming method for preparing a pulp material into a dried paper-plastic product, comprising: at least one slurrying step, comprising using a first lower mold in a slurry tank Collecting the pulp material body, and forming a wet embryo composed of the pulp material body above the first lower mold; a first pre-pressing step comprising pressing a first upper mold and the first lower mold Combining with the pressure clamping and discharging part of the moisture and/or moisture contained in the wet embryo to form a first semi-finished product; a second pre-pressing step comprising using a second upper mold and a first The two lower molds are pressed together to press-clamp the first semi-finished product, and discharge part of the moisture and/or moisture contained in the first semi-finished product to form a second semi-finished product; a hot press forming step, The method comprises heating and pressing together a third upper mold and a third lower mold to hot-press the second semi-finished product, and discharging part of moisture and/or moisture contained in the second semi-finished product to form a second semi-finished product. a third semi-finished product; and a cutting step, cutting The third semi-finished product to form the finished paper and plastic.

In an embodiment of the present invention, in the first pre-compression step, a first spacing is formed between the first upper mold and the first lower mold, and the first spacing is between 1 cm and 5 cm.

In an embodiment of the present invention, in the second pre-pressing step, a second spacing is formed between the second upper mold and the second lower mold, and the second spacing is 1.2 cm.

In an embodiment of the present invention, in the hot press forming step, the third upper mold and A third spacing is formed between the third lower molds, and the third spacing is less than or equal to 1.2 cm.

In an embodiment of the present invention, in the first pre-pressing step, a heating program is further included to heat the wet embryo by the first upper mold and the first lower mold.

In an embodiment of the present invention, in the second pre-pressing step, a heating program is further included to heat the first upper mold and the second lower mold to heat the first semi-finished product.

In an embodiment of the invention, the first lower mold collects the pulp material from the slurry tank, and the first lower mold stays in the slurry tank for collecting the pulp material for 3.5 seconds, and then the first upper mold The mold and the first lower mold are slightly pressed together for a duration of about 3 seconds.

In an embodiment of the present invention, the first upper mold, the first lower mold, the second upper mold, the second lower mold, and the third upper mold and the third lower mold respectively have at least one through hole, and the through holes respectively penetrate the same And a mold for discharging moisture and/or moisture contained in the pulp material body, the wet embryo, the first semi-finished product, the second semi-finished product and the third semi-finished product, respectively.

In an embodiment of the invention, the first upper mold, the second upper mold and the third upper mold respectively comprise at least one vacuum adsorption device, wherein the vacuum adsorption device is respectively in liquid communication with the through holes for The through holes respectively absorb the above water and/or moisture.

In an embodiment of the present invention, in the at least one slurrying step, the first upper mold and the first lower mold are made of aluminum, and the first lower mold has a first inner surface, and the first inner surface is provided There is a first web for collecting the pulp body on the first web to form the wet embryo.

In an embodiment of the present invention, in the second pre-compression step, the first network is a two-layer network structure, including a first inner network and a first outer network, and the first outer network Larger than the number of meshes of the first inner mesh, so that the wet embryos can be retained on the first network, and at the same time When the vacuum adsorption device adsorbs excess water vapor through the through holes, it is possible to prevent the wet embryos from being adsorbed into the through holes and causing the through holes to be blocked.

In an embodiment of the invention, the second upper mold and the second lower mold are made of aluminum, the second upper mold has a convex portion, the convex portion is provided with an upper mesh, and the second lower mold has a groove, the top edge of the groove is provided with a lower mesh, wherein the lower mesh is a double mesh structure to prevent the second semi-finished product from sticking to the second upper and lower molds during demolding, and Before the second upper mold and the second lower mold press-clamp the first semi-finished product, the first semi-finished product is placed between the upper and lower woven fabrics.

In an embodiment of the present invention, in the hot press forming step, the third upper mold and the third lower mold are made of aluminum, and the third upper mold has a convex portion, and the convex portion is provided with an upper mesh. And the third lower mold has a groove, the top edge of the groove is provided with a lower mesh, and before the third upper mold and the third lower mold press-clamp the second semi-finished product, the second A semi-finished product is placed between the upper and lower fabrics.

In an embodiment of the invention, the second lower mold is selected from the group consisting of sintered copper particles, stainless steel, and a nickel alloy, and the second upper mold is made of aluminum.

In an embodiment of the invention, the second lower mold is a copper sintering mold, which is made by sintering a plurality of copper particles, each copper particle having a diameter of about 2 μm to 20 μm. In this embodiment, the second lower mesh is not needed to avoid The second lower web is heat-imprinted with the reticular marks produced on the inner or outer surface.

In order to achieve the above object, the present invention further provides a multi-station automation machine for automatically performing the wet paper forming method as described above, the multi-station automatic machine including a fishing a pulp station, a pre-press station, a hot press forming station, a cutting station and at least one driving device, wherein the slurry station is used to perform the slurrying step and the first pre-pressing step.

In an embodiment of the present invention, the multi-station automation machine further includes a flipping slurry device, and the first lower mold includes a driving component and at least one flipping shaft, the flipping shaft is disposed at the first The lower mold rotates the driving element to drive the tilting shaft by 180 degrees, and drives the first lower mold to rotate by 180 degrees.

In an embodiment of the present invention, the multiplex station automation machine further includes a suction component disposed in the first lower mold, and the first lower mold is rotated 180 degrees to actuate the first lower mold The pulp body is adsorbed in the slurry tank to form the wet embryo on the first lower mold.

In order to achieve the above object, the present invention provides a multiplex station automation machine and a reversing slurry device suitable for performing the above wet paper forming method, which is used for automatically forming a slurry into a desiccated The paper-plastic product comprises at least one body; a slurry tank, a first upper mold and a first lower mold, wherein the first lower mold is formed into a slurry surface, and the turning slurry device is disposed in the first lower mold. The method includes: a flip frame body, including a flip shaft and a driving component, and the first lower mold is disposed on the flip frame body, and the first lower mold is rotated to rotate by 180 degrees, so that the first lower mold is The slurry surface is in a slurry state or the slurry surface is in a suction state; a group of lifting elements are respectively disposed on the opposite sides of the slurry tank, and the tilting shaft is mounted on the lifting element. The lifting element drives the flip frame body to sink into and out of the pulp material body; and a suction element is connected to the flip frame body, and the lifting element drives the flip frame body to sink into the slurry tank. Slurry and slurry of the first lower mold When the slurry was sucked down state, the suction member body on pulpwood adsorbent slurry fishing lower surface of the first mold.

In addition, in order to achieve the above object, the present invention provides a paper-plastic product obtained by the above-described wet paper molding method, wherein the paper-plastic product has a first surface and a second surface, and the first surface and the first surface The second surface has a surface smoothness value greater than or equal to 3 Bekk seconds smoothness, and the first surface is an inner surface of the paper product, and the second surface is an outer surface of the paper product.

10‧‧‧First upper mold

11‧‧‧First lower mold

111‧‧‧First Network

15‧‧‧First drive

20‧‧‧Second upper mold

201‧‧‧heating plate

21‧‧‧Second lower mold

22‧‧‧through hole

25‧‧‧Second drive

30‧‧‧ Third upper mold

301‧‧‧ raised parts

302‧‧‧ Third Network

31‧‧‧ Third lower mold

311‧‧‧ Groove

312‧‧‧ Third Network

33‧‧‧through hole

35‧‧‧ Third drive

40‧‧‧Vacuum adsorption device

60‧‧‧Tools

70‧‧‧Multi-station automation machine

80‧‧‧Flipping slurry device

90‧‧‧Suction device

100‧‧‧ pulp tank

101‧‧‧first semi-finished product

102‧‧‧Second semi-finished products

103‧‧‧ third semi-finished product

104‧‧‧paper products

1041‧‧‧ first surface

1042‧‧‧ second surface

1001‧‧‧heating plate

1002‧‧‧Pulpwood body

P1‧‧‧Slurry station

P2‧‧‧Pre-press station

P3‧‧‧Hot forming station

P4‧‧‧Cut station

S1‧‧‧ Slurry Step

S2‧‧‧First preloading step

S3‧‧‧Second preloading step

S4‧‧‧Hot forming step

S5‧‧‧ cutting steps

1 is a schematic flow chart of a wet paper forming method according to a preferred embodiment of the present invention; and FIG. 2 is a multiplex station automatic machine according to a preferred embodiment of the present invention executed as shown in FIG. Schematic diagram of the operation of the wet paper forming method; Fig. 3 is a schematic view of the second lower mold of the wet paper forming method of the present invention; Fig. 4 is a schematic view of the third upper mold of the wet paper forming method of the present invention; -1 is a schematic cross-sectional view of a third upper and lower mold of the wet paper forming method of the present invention; FIG. 5 is a schematic structural view of a multi-station automatic machine according to the present invention; and FIG. 6 is a fifth diagram of the present invention A schematic view of a first lower mold of a multi-station automation machine, which is a reversing slurry; and a seventh side view of a paper-plastic product according to a preferred embodiment of the present invention.

The technical content and detailed description of the present invention will now be described with reference to the following drawings: Please refer to FIG. 1 and FIG. 5, wherein FIG. 1 is a wet paper forming method according to a preferred embodiment of the present invention. Schematic diagram of the process, and Figure 5 is a 1 is a schematic view showing the structure of a multiplex station automation machine 70 of the wet paper forming method, and the wet paper forming method of the present invention is used for making a pulp material 1002 into a dried paper-plastic product 104 (see item 7). The figure includes: at least one slurrying step S1, comprising: collecting the pulp material body 1002 in a slurry tank 100 by using a first lower mold 11, and forming a pulp from above the first lower mold 11 a wet embryo (not shown) formed by the material body 1002; a first pre-pressing step S2, pressing a first upper mold 10 and the first lower mold 11 to press-mold and discharge the wet embryo Part of the moisture and/or moisture contained to form a first semi-finished product 101; a second pre-pressing step S3, comprising providing a second upper mold 20 and a second lower mold 21 to press each other The semi-finished product 101 is subjected to pressure clamping and discharges part of the moisture and/or moisture contained in the first semi-finished product 101 to form a second semi-finished product 102; a hot press forming step S4, including a third upper portion The mold 30 and a third lower mold 31 are heated and pressed together to heat-press the second semi-finished product 102 and discharge A portion of the moisture and/or moisture contained in the second semi-finished product 102, thereby forming a third semi-finished product 103; and a cutting step S5, cutting the third semi-finished product 103 to form the paper-finished product 104.

Please refer to FIG. 2 and FIG. 5. FIG. 2 is a schematic diagram of the operation of the wet-plastic forming method according to the first embodiment of the multiplex automation machine according to the preferred embodiment of the present invention. The multiplex station automation machine 70 includes a slurry station P1, a pre-press station P2, a hot press forming station P3 and a cutting station P4 for integrated automation execution as described in FIG. a slurrying step S1, a first pre-pressing step S2, a second pre-pressing step S3, a hot-press forming step S4, and a cutting step S5 in the wet paper forming method, wherein the slurry station P1 is used to perform the slurrying Step S1 and the first pre-pressing step S2.

In short, the slurrying step S1 and the first pre-pressing step S2 are performed in the first and second molds 10, 11 in the slurry station P1, and then in the pre-pressing station P2. mold The second pre-pressing step S2 is carried out with 20, 21, and the degree of drying of the wet embryo is accelerated by means of separate secondary dehydration (secondary pre-pressure), and then heated by the third upper and lower molds 30, 31 and pressed against each other for hot pressing. The molding step S4 can not only greatly shorten the time required for the drying of the wet paper-plastic semi-finished product/finished product, but also avoid the problem of damage to the wet paper-plastic semi-finished/finished structure caused by one-time hot pressing, improve the yield yield, and increase the amount. Productivity.

Furthermore, the multi-station automation machine 70 of the present invention further includes a single driving device for automatically controlling the first upper and lower molds 10, 11, the second upper and lower molds 20, 21 and the third upper and lower molds 30, 31. Moving, or comprising a plurality of side-by-side driving devices 15, 25, 35 for respectively driving the first upper mold 10 to carry the first semi-finished product 101 from the slurry station P1 to the preload The station P2 places the first semi-finished product 101 on the second lower mold 21. The second driving device 25 is configured to drive the second upper mold 20 to carry the second semi-finished product 102 from the pre-pressing station P2 to the hot-press forming station P3 to place the second semi-finished product 102 under the third On the mold 31. The third driving device 35 is configured to drive the third upper mold 30 to carry the third semi-finished product 103 from the hot press forming station P3 to the cutting station P4 to place the third semifinished product 103 on the cutting worker. Station P4. The driving devices may be a mechanical arm or a lead screw or rail device driven by a driving motor.

More specifically, in the slurrying step S1 shown in FIGS. 2 and 5, the first lower mold 11 is driven by the first driving device 15 to descend into a slurry tank 100, and is taken from the slurry tank 100. And collecting the pulp body 1002 formed by the liquid pulp in the slurry tank 100, and the first lower mold 11 itself has a vacuum adsorption function for adsorbing the slurry to fill the working surface of the first lower mold 11 To form a wet embryo, the first lower mold 11 stays in the slurry tank 100 for about 3.5 seconds and then leaves the slurry tank 100 to complete the slurrying step S1. Next, the first lower mold of the wet embryo formed by the pulp body 1002 is loaded The tool 11 is driven by the first driving device 15 to move up to a proper position, and the first upper mold 10 is moved downward to press and clamp the first lower mold 11 to perform a wet embryo formed by the pulp body 1002. The first pre-pressing step S2 maintains a first spacing between the first upper mold 10 and the first lower mold 11, and the first spacing may be from 1 cm to 5 cm, preferably 3 cm. The excess moisture contained in the wet embryo formed by the pulp material body 1002 is then sucked by a vacuum adsorption device 40 to the outside of the first upper mold 10 to further dry the wet embryo into a predetermined shape. The semi-finished product 101, the first pre-pressing step S2 lasts for about 3 seconds. In a different embodiment, the first pre-pressing step S2 further includes a heating process for providing at least one heating plate 1001 in the first upper mold 10 and the first lower mold 11 respectively. The temperature of the wet embryo between the first upper mold 10 and the first lower mold 11 is maintained between about 60 ° C and 80 ° C, preferably 70 ° C. After the first pre-pressing step S2 is completed, the first semi-finished product 101 has a dryness of about 10% to 50%, preferably 33%.

In various embodiments of the present invention, the pulp material body 1002 may be a plurality of different lengths and different types of pulp fibers. For example, the pulp material body 1002 may be composed of a first pulp fiber, a second pulp fiber, and a third pulp fiber. The fiber length of the first pulp fiber is substantially larger than the fiber length of the second pulp fiber and the third pulp fiber, so that the finished paper-plastic product 104 (see Figure 7) has good structural strength and smooth inner and outer surfaces. The advantages.

In the different embodiments of the present invention, in order to further increase the smoothness of the inner and outer surfaces of the paper-plastic product 104 (see FIG. 7), and to achieve the smooth appearance of both sides of the inner and outer surfaces of the paper-plastic product 104, the wet The paper forming method further comprises rotating the first lower mold 11 by a flipping slurry device 80 in a slurrying step S1 to rotate by 180 degrees. And after the first lower mold 11 is rotated by 180 degrees by a suction device 90, the first lower mold 11 adsorbs the pulp material body 1002 from the slurry tank 100 to form a wet embryo on the first lower mold 11. body. Therefore, in addition to the above The first lower mold 11 is formed in a fishing manner (that is, the first lower mold 11 faces upward in the slurry tank 100 to collect the pulp material 1002) to form a wet embryo body. In the embodiment, the flipping slurry After the first lower mold 11 is turned 180 degrees, the apparatus 80 sucks the pulp material 1002 by the suction device 90, so that the adsorbed pulp material 1002 is attached to the surface of the first lower mold 11, that is, the first The surface of the mold 11 is lowered toward the slurry tank 100 to adsorb the pulp body 1002.

The difference between the manner in which the pulp material 1002 is taken up by the overturning slurry device 80 and the manner in which the first lower mold 11 is used to collect the pulp material 1002 is that the fibers in the pulp material body 1002 are deposited on the bottom of the mold. The former causes the fibers near the first mesh 111 (detailed in detail) to be relatively short due to the suction force, that is, the shorter fibers in the pulp body 1002 are adsorbed and deposited on the bottom of the inverted mold, so that the subsequent paper is formed. The corners of the finished product will have a more beautiful right angle state; while the latter causes the fibers in the pulp material body 1002 to be only subjected to gravity deposition due to the fishing method, the longer fibers in the pulp material body 1002 will be deposited on the bottom of the mold, resulting in subsequent The corners of the finished paper product will have a less rounded or obtuse angle.

In the embodiment shown in FIG. 2 and FIG. 5, the first upper mold 10 and the first lower mold 11 respectively have at least one through hole (not shown), and the through holes are distributed in the first The upper mold 10 and the inner surface of the first lower mold 11 respectively penetrate the molds, so that the water vapor or water vapor released from the wet embryo can be discharged to the first upper mold 10 and the first through the through holes, respectively. The lower mold 11 is outside. Moreover, the vacuum adsorption device 40 is in fluid communication with the first upper mold 10 and the first lower mold 11, respectively, wherein the vacuum adsorption device 40 can be a vacuum pump. The vacuum adsorption device 40 is respectively in liquid communication with the through holes and is exhausted by the through holes, through which the moisture in the wet embryos released from the molds is respectively sucked through the through holes, and the wet air can be sucked The water vapor generated by the heat of the embryo is discharged outside the mold.

In the embodiment shown in FIG. 2 and FIG. 5, the first upper mold 10 is a convex mold, that is, the first upper mold 10 has a protrusion in the center, and the first lower mold 11 is a The groove-shaped mold, that is, the center of the first lower mold 11 has a groove. The first upper mold 10 and the first lower mold 11 may be an aluminum material mold. The first lower mold 11 has a first inner surface (not shown), a first inner net 111 is disposed on the first inner surface, and the first net is a double mesh structure including a first inner portion. a mesh (not shown) and a first outer mesh (not shown), wherein the number of meshes of the first outer mesh is larger than the mesh of the first inner mesh, so that the wet embryo can be left in the first mesh 111, and the above-mentioned weaving net is designed to accelerate the discharge of water vapor or water vapor released from the wet embryo body in the mold, and at the same time, when the vacuum adsorption device 40 adsorbs excess water vapor through the through holes, the wet embryo can be avoided. The adsorption into the through holes together causes the through holes to be blocked, and at the same time, the first lower mold 101 is prevented from sticking to the first lower mold 11 when demolding.

In the different embodiments, the first upper mold 10 can be a groove-shaped mold, and the first lower mold 11 is a convex mold, that is, the first upper mold 10 and the first lower mold 11 are visible. The product needs to be set to a male mold and a female mold type corresponding to each other.

After the operation of the first slurry step S1 and the first pre-pressing step S2, the first upper mold 10 also has a vacuum adsorption effect, so that the first upper mold 10 adsorbs the first semi-finished product 101, and the first driving device 15 is The first upper mold 10 and the first semi-finished product 101 adsorbed thereon are brought back to the initial position. The time required to complete the above-described slurrying step S1 and the first pre-pressing step S2 will be less than 10 seconds.

Next, as shown in FIGS. 2 and 5, the first upper mold 10 adsorbs the first semi-finished product 101 and is driven by the first driving device 15, and delivers the first semi-finished product 101 to the second lower mold 21 To perform the second pre-pressing step S3. The second upper and lower molds 20, 21 are pressed and clamped to The first semi-finished product 101 is subjected to secondary dehydration to further reduce the water content in the first semi-finished product 101 to increase its dryness. In the second pre-pressing step S3, a second spacing is maintained between the second upper and lower molds 20, 21, and the second spacing is smaller than the first spacing. In this embodiment, the second pitch is preferably 1.2 cm. The first semi-finished product 101 is heated by the heating plate 201 in the second upper and lower molds 20, 21 by the heating process, and the heating temperature is maintained between about 60 ° C and 80 ° C, preferably 70 ° C, and the heating time is Continuing for less than about 3 seconds, and the excess gas and moisture are also sucked off by the vacuum adsorption device 40, thus obtaining the second semi-finished product 102, at which time the second semi-finished product 102 has a dryness of about 58%-70%, and the second pre-compression is completed. The time required for step S3 is between about 30 seconds and 50 seconds.

As shown in FIGS. 2 and 5, similarly to the structure of the first upper mold 10 and the first lower mold 11, the second upper mold 20 and the second lower mold 21 respectively have at least one through hole. For example, the second lower mold 21 shown in FIG. 3 has a plurality of through holes 22. The through holes are distributed on the inner surfaces of the second upper mold 20 and the second lower mold 21 and penetrate the molds 20 and 21 respectively, so that the water vapor or water vapor released by the second semi-finished product 102 can be through the through holes. They are discharged to the outside of the second upper and lower molds 20, 21, respectively. Similarly, the vacuum adsorption device 40 is in fluid communication with the through holes and is exhausted by the through holes, respectively, for respectively sucking the water and gas in the molds 20, 21 through the through holes. The second semi-finished product 102 is discharged by the water vapor generated by the heat.

The through holes may be formed during the process of fabricating each of the molds, such as by wire cutting, laser processing, grinding, or electric discharge machining. In other embodiments, the through holes may also be integrally formed by a mold casting/sintering process, for example, the second upper mold 20 is made of aluminum, and the second lower mold 21 may be made of a porous metal material. The porous metal material is selected from the group consisting of sintered copper particles, stainless steel and nickel alloy. Preferably, the second lower mold 21 is a copper sintering mold, which is made by sintering a plurality of copper particles, each of which has a straightness of about 2 μm to 20 μm. In the copper grain sintering process, at least one hole penetrating the second lower mold 21 is left in the second lower mold 21, and the pores correspond to the structure and function of the through holes 22 described above. Furthermore, the second lower mold 21 made by sintering copper particles has pores of different sizes on the surface thereof, and the material properties of the copper grain sintering and the mold manufacturing method can prevent the second semi-finished product 102 from sticking to the second lower mold when demolding. 21, therefore, in this embodiment, the presence of the first mesh in the first lower mold 11 as described above is not required, and the mesh formed on the surface of the second semi-finished product 102 after the woven mesh structure of the first woven mesh is heated can be avoided. trace.

As shown in FIGS. 2 and 5, after the second pre-pressing step S3 is completed, the second driving device 25 moves the second upper mold 20 and the second adsorbed second thereof in a horizontal direction and/or a vertical direction. The semi-finished product 102 is moved to the third lower mold 31, and the second semi-finished product 102 is delivered to the third lower mold 31, and the second upper mold 30 and the second lower mold 31 are successively subjected to the hot press forming step S4. The third upper mold 30 and the third lower mold 31 use the heating program to provide at least one heating plate to the third upper and lower molds 30, 31, respectively, and the third upper and lower molds 30, 31 are combined and heated simultaneously. The second semi-finished product 102 is further dried to obtain a third semi-finished product 103. In the hot press forming step S4, the temperature of the heating plate is controlled between 100 ° C and 180 ° C, preferably 120 ° C, but not limited thereto, and the heating time lasts for about 10 seconds, and the third upper mold 30 A third spacing (not shown) is maintained between the third lower mold 31 and the third spacing is less than or equal to 2 cm, preferably 1.2 cm, but not limited thereto. At this time, the third semi-finished product 103 has a dryness of about 50% to 100%, and more specifically, the third semi-finished product 103 has a dryness of about 92%.

As shown in FIGS. 2 and 5, after the hot press forming step S4 is completed, the third upper mold 30 is driven by the third driving device 35, and the third upper mold 103 is vacuum-adsorbed by the third upper mold 30. Reverting to the initial position, the time required to complete all of the above steps will be less than 160 seconds.

In particular, as shown in Figure 4, Figure 4-1, and Figure 5, the third The upper mold 30 and the third lower mold 31 respectively have at least one through hole 33, and the through holes 33 are distributed on the inner surfaces of the third upper mold 30 and the third lower mold 31, respectively, and penetrate the molds respectively to make the wet embryo The water vapor or water vapor released therefrom may be discharged to the third upper mold 30 and the third lower mold 31 by the through holes 33, respectively. And the vacuum adsorption device 40 is in liquid communication with the third upper mold 30 and the through holes 33 of the third lower mold 31, respectively, for respectively sucking the wet embryos through the through holes 33 and releasing the molds. The water vapor in the water can be discharged from the mold by the water vapor generated by the heat of the wet embryo.

In various embodiments, the third lower mold 31 may be composed of a porous metal material selected from the group consisting of sintered copper particles, stainless steel, and nickel alloy. Preferably, the third lower mold 31 is a copper sintering mold, which is made by sintering a plurality of copper particles each having a diameter of about 2 μm to 20 μm, and the copper particles are left in the third lower mold 31 during sintering. At least one penetrates the aperture of the second lower mold 21, and the apertures correspond to the structure and function of the through holes 22 described above.

As shown in FIG. 4, FIG. 4-1, and FIG. 5, the third upper mold 30 is a convex mold, that is, the third upper mold 30 has a convex portion 301 at the center, and the second lower mold 31 The second lower mold 21 is a groove-shaped mold, that is, the third lower mold 31 has a groove 311 in the center. A third upper mesh 302 is provided on the end surface of the convex portion 301 of the third upper mold 30. In addition, the bottom edge of the groove 311 of the second lower mold 32 is a smooth surface, and the top edge of the groove 311 is provided with a third lower mesh 312 (see FIG. 4-1), and the above-mentioned mesh design can be Accelerating the discharge of water vapor or water vapor released from the wet embryo body in the mold, which will increase the surface smoothness of the inner and outer surfaces of the subsequent paper-plastic product, so that the subsequent paper-plastic products have a smooth effect on both surfaces. At the same time, when the vacuum adsorption device 40 adsorbs excess water vapor through the through holes, the wet embryos are prevented from being adsorbed into the through holes, thereby blocking the through holes, and the third upper mesh 302 and the third lower mesh 312 can prevent the third semi-finished product 103 from adhering to the third upper mold 30 and the third lower mold 31 during demolding.

In the different embodiments of the present invention, if the third lower mold 31 is made of a porous metal material such as sintered copper particles, stainless steel and nickel alloy, the surface of the third lower mold 31 will be distributed in different sizes. The plural pores have the same structure and function as the through holes of the foregoing embodiment, and will not be described again.

In a different embodiment of the present invention, before the hot press forming step S4, a wetting step (not shown) is further included, and the second semifinished product 102 is sprayed with water vapor or minute water droplets to complete the hot press forming step S4. The third semi-finished product 103 increases the surface smoothness. Further, in order to increase the surface smoothness of the paper-plastic product 104 (see Fig. 7), the third upper and lower molds 30, 31 may be made of an aluminum material mold or other material having a high surface smoothness after the mold is formed.

Then, the third upper mold 60 adsorbs the third semi-finished product 103 and moves to the cutting position through the third driving device 35 to perform the cutting step S5, and at least one cutter 60 is provided to cut the excess burrs of the third semi-finished product 103. After cutting and cutting off the excess edge portion, the structure of the finished paper-formed product can be obtained. The tool 60 can be a mechanical tool or a laser cutting method.

The paper-plastic product 104 manufactured by the method of the present invention and the multi-station automation machine has a first surface 1041 and a second surface 1042. See Figure 7 for a side cross-sectional view of the paper-plastic product. In the preferred embodiment of the present invention, the first surface 1041 is an inner surface of the paper product 104, and the second surface 1042 is an outer surface of the paper product 104, and the first surface 1041 and the second surface 1042 Both have a surface smoothness value greater than or equal to 3Bekk seconds smoothness, with 6-14Bekk second smoothness being preferred.

In summary, the wet paper forming method provided by the present invention preliminarily presses the first upper mold and the first lower mold in the slurrying step (first pre-pressing step), and then the second upper mold and The second lower mold performs a second pre-pressing step, and by means of secondary dehydration, the wet embryo can be Before the hot pressing step, the water content of the part is discharged to improve the drying degree of the wet embryo before the hot press forming step, so as to shorten the time taken for the subsequent hot press forming step, and increase the solidity of the semi-finished product while avoiding the hot press forming process. The rapid heating and pressurization of the semi-finished product with high water content causes the fragmentation of the semi-finished product, shortens the time taken for the drying of the pulp, can effectively improve the efficiency and increase the output, so it can effectively solve the conventional process and equipment in the manufacture of paper and plastic products due to hot pressing The steps are too time consuming, lengthening the overall process time, resulting in a relatively slow working speed and relatively low production yield and the problem of fragmentation of the semi-finished product.

Furthermore, the present invention performs secondary dehydration (first and second pre-pressing steps) so that the pulp fibers in the paper-plastic semi-finished product can be partially discharged before the hot pressing step, and the pulp fibers are raised before the hot pressing step. Dryness, in order to shorten the time taken by the subsequent hot pressing step, and increase the solidity of the semi-finished product. Secondly, the copper granule sintering mold is used to form the surface of the mold to form a plurality of microscopically permeable pores. Therefore, it is not necessary to set the woven net in the mold, so as to avoid the heat-insulating in the mold. The mesh marks on the inner or outer layer will improve the surface smoothness of the finished paper.

It will be apparent to those skilled in the art that various changes can be made in accordance with the embodiments of the present invention without departing from the spirit of the invention. Therefore, it is to be understood that the invention is not limited by the scope of the invention, and is intended to cover the modifications of the spirit and scope of the invention.

S1‧‧‧ Slurry Step

S2‧‧‧First preloading step

S3‧‧‧Second preloading step

S4‧‧‧Hot forming step

S5‧‧‧ cutting steps

Claims (18)

A wet paper forming method for forming a pulp material into a dried paper-plastic product, comprising: at least one slurrying step, comprising: collecting the pulp body in a slurry tank by using a first lower mold, Further forming a wet embryo composed of the pulp material body above the first lower mold; a first pre-pressing step comprising pressing a first upper mold and the first lower mold to pressurize the mold clamping, And discharging part of the moisture and/or moisture contained in the wet embryo to form a first semi-finished product; and a second pre-pressing step, comprising pressing a second upper mold and a second lower mold to each other The first semi-finished product is subjected to pressure clamping and discharging a part of moisture and/or moisture contained in the first semi-finished product to form a second semi-finished product; a hot press forming step, comprising: a third upper mold and a third lower mold is heated and pressed together to heat-press the second semi-finished product, and discharges part of moisture and/or moisture contained in the second semi-finished product to form a third semi-finished product; Cutting the third semi-finished product to form the finished paper product The wet paper forming method according to claim 1, wherein in the first pre-pressing step, a first spacing is formed between the first upper mold and the first lower mold, the first spacing is 1 Between cm and 5 cm. The wet paper forming method according to claim 1, wherein in the second pre-pressing step, a second spacing is formed between the second upper mold and the second lower mold, the second spacing is 1.2 cm. The wet paper forming method according to claim 1, wherein the hot press forming step The third upper mold and the third lower mold form a third spacing, and the third spacing is less than or equal to 1.2 cm. The wet paper forming method according to claim 1, wherein in the first pre-pressing step, a heating program is further included, and the first upper mold and the first lower mold heat the wet embryo. . The wet paper forming method according to claim 1, wherein in the second pre-pressing step, a heating process is further included to cause the second upper mold and the second lower mold to perform the first semi-finished product. heating. The wet paper forming method according to claim 1, wherein the first upper mold, the first lower mold, the second upper mold, the second lower mold, and the third upper mold and the third lower mold respectively have at least a through hole penetrating through the molds for respectively discharging moisture and/or moisture contained in the pulp material body, the wet embryo, the first semi-finished product, the second semi-finished product and the third semi-finished product. The wet paper forming method according to claim 7, wherein the first upper mold, the second upper mold and the third upper mold respectively comprise at least one adsorption device, and the adsorption device and the through holes respectively The liquid is connected to absorb the water and/or moisture separately through the through holes. The wet paper forming method according to claim 1, wherein in the at least one slurrying step, the first upper mold and the first lower mold are made of aluminum, and the first lower mold has a first An inner surface having a first web on the first inner surface for collecting the pulp body on the first web to form the wet embryo. The wet paper forming method according to claim 1, wherein in the second pre-pressing step, the second upper mold and the second lower mold are made of aluminum, and the second upper mold has a protrusion. a portion of the raised portion is provided with an upper mesh, and the second lower mold has a groove, the top edge of the groove is provided with a lower mesh, and the second upper mold and the second lower mold are The first semi-finished product is placed between the upper and lower woven fabrics before half of the finished product is subjected to pressure clamping. The wet paper forming method according to claim 1, wherein in the hot press forming step, the third upper mold and the third lower mold are made of aluminum, and the third upper mold has a convex portion. The protrusion is provided with an upper mesh, and the third lower mold has a groove, the top edge of the groove is provided with a lower mesh, and the third upper mold and the third lower mold are opposite to the second The second semi-finished product is placed between the upper and lower woven fabrics before the semi-finished product is subjected to pressure clamping. The wet paper forming method according to claim 1, wherein the second lower mold is selected from the group consisting of sintered copper particles, stainless steel and nickel alloy, and the second upper mold is made of aluminum. . The wet paper forming method according to claim 1, wherein in the slurrying step, the first lower mold is rotated by 180 degrees by using a flipping slurry device. The wet paper forming method according to claim 13 , wherein in the slurrying step, the method further comprises: using a suction device to rotate the first lower mold after rotating 180 degrees, so that the first lower mold is The pulp body is adsorbed in the slurry tank to form a wet embryo on the first lower mold. A multi-station automation machine for automatically performing the wet paper forming method as described in claim 1, wherein the multi-station automation machine includes a slurry station, a pre-press station, and a heat a press forming station, a cutting station and at least one driving device, wherein the slurry station is used to perform the slurrying step and the first pre-pressing step. The multiplex station automation machine according to claim 15, wherein the at least one driving device is configured to respectively drive the first upper mold to carry the first semi-finished product from the slurry processing station to the The pre-press station station places the first semi-finished product on the second lower mold. The multiplex station automation machine of claim 16, wherein the at least one driving device is configured to drive the second upper mold to carry the second semi-finished product from the pre-pressing station to the thermoforming station The second semifinished product is placed on the third lower mold. The multiplex station automation machine according to claim 17, wherein the at least one driving device is configured to drive the third upper mold to carry the third semi-finished product from the thermoforming station to the cutting station. The third semi-finished product is placed at the cutting station.