TWI874122B - Paper plastic molding machine pulp suction mold - Google Patents

Abstract

A pulp suction mold of a paper molding machine includes a molding lower mold and a molding upper mold. The molding upper mold and the molding lower mold define at least one mold cavity for accommodating pulp, and at least one mold opening connecting the outside world and the at least one mold cavity. The molding upper mold also defines an upper air chamber, and includes a plurality of upper channels connecting the at least one mold cavity and the upper air chamber, and an upper interface connecting the outside world and the upper air chamber and opening toward one side. The upper interface is located at one end of the upper air chamber adjacent to the at least one mold cavity, and is suitable for allowing suction airflow to pass through the upper interface, and to suck the pulp in the pulp barrel into the at least one mold cavity through the at least one mold opening, and to suck the gas and pulp in the at least one mold cavity, so that the gas and the liquid in the pulp enter the upper air chamber through the upper channels, and then are discharged from the upper air chamber through the upper interface.

Description

Paper plastic molding machine pulp suction mold

The present invention relates to a pulp suction mould, in particular to a pulp suction mould for a paper plastic forming machine.

A known pulp molding mold disclosed in Chinese Patent Publication No. CN219752850U includes an upper mold and a lower mold that can correspond to the upper mold and define a bottle-shaped cavity. The upper mold includes a plurality of first negative pressure holes connected to the bottle-shaped cavity. The lower mold includes a plurality of second negative pressure holes connected to the bottle-shaped cavity. The first negative pressure holes and the second negative pressure holes are used to suck gas and pulp in the bottle-shaped cavity, so that the gas and liquid in the pulp are discharged, and the fibers in the pulp are adsorbed on the wall surfaces of the upper mold and the lower mold to form a wet paper bottle model.

Since the first negative pressure holes and the second negative pressure holes are directly connected to a vacuum pump, without a buffer space, the suction force is small and unstable. Therefore, the paper bottle model often has technical problems such as uneven thickness or thickness that does not meet the standard.

Therefore, the purpose of the present invention is to provide a pulp suction mould for a paper-molding machine capable of improving the quality of finished products.

Therefore, the slurry suction mold of the paper plastic molding machine of the present invention is suitable for entering and exiting a pulp barrel containing paper pulp. The slurry suction mold includes a molding lower mold and a molding upper mold.

The upper forming mold and the lower forming mold define at least one mold cavity for accommodating paper pulp, and at least one mold opening connecting the outside world and the at least one mold cavity. The upper forming mold further defines an upper air chamber located above the at least one mold cavity along the up-down direction, and includes a plurality of upper channels connecting the at least one mold cavity and the upper air chamber, and an upper interface connecting the outside world and the upper air chamber and opening toward one side. The upper interface is located at one end of the upper air chamber adjacent to the at least one mold cavity along the up-down direction, and is suitable for suction airflow to suck the paper pulp in the pulp barrel from the at least one mold opening into the at least one mold cavity, and to suck the gas in the at least one mold cavity and the liquid in the paper pulp into the upper air chamber through the upper channels, and then discharged from the upper air chamber through the upper interface.

The effect of the present invention is that a buffer space for accommodating gas and liquid is formed by the upper air chamber, and the upper interface is designed to be adjacent to at least one mold cavity, so that the liquid in the pulp can be quickly discharged from the upper interface after entering the upper air chamber, thereby improving the suction effect and stability during suction.

Referring to FIG. 1 to FIG. 4 , an embodiment of the slurry suction mold of the present invention is installed in a paper molding machine 1. The paper molding machine 1 comprises a frame unit 11, a pulp barrel 12 installed on the frame unit 11 and suitable for containing paper pulp, and a vacuum pump 13 installed on the frame unit 11. The slurry suction mold is movably installed on the frame unit 11 along an up-down direction Z relative to the pulp barrel 12, and comprises a molding lower mold 2 and a molding upper mold 3.

Referring to FIG. 1 and FIG. 3 to FIG. 5 , the lower mold 2 includes a lower mold surface 21 facing the upper mold 3, a lower mold upper inner surface 22 adjacent to the lower mold surface 21 along the vertical direction Z, a lower mold lower inner surface 23 away from the lower mold surface 21 along the vertical direction Z and defining a lower air chamber 20 with the lower mold upper inner surface 22, a plurality of lower channels 24 connected to the mold cavity 301 and the lower air chamber 20, and a lower interface 25 connected to the outside and the lower air chamber 20 and located below the lower air chamber 20 along the vertical direction Z. In this embodiment, the lower mold upper inner surface 22 and the lower mold lower inner surface 23 are respectively a plane.

The molding upper mold 3 includes an upper mold surface 31 facing the lower mold surface 21 and capable of defining a plurality of mold cavities 301 and a plurality of mold openings 302 with the lower mold surface 21, an upper mold upper inner surface 32 far from the mold cavities 301, an upper mold lower inner surface 33 adjacent to the mold cavities 301 and defining an upper air chamber 303 with the upper mold upper inner surface 32, a plurality of upper channels 34 connected to the mold cavities 301 and the upper air chamber 303, and an upper interface 35 connected to the outside and the upper air chamber 303 and opening along a horizontal direction toward one side. The mold cavities 301 are suitable for containing paper pulp. Each of the mold openings 302 is connected to the outside and the respective mold cavities 301. In this embodiment, the upper mold upper inner surface 32 and the upper mold lower inner surface 33 are respectively a plane. The upper interface 35 is adjacent to the upper mold lower inner surface 33 along the vertical direction Z. The upper interface 35 is separated from the upper mold upper inner surface 32 by a first distance d1, and separated from the upper mold lower inner surface 33 by a second distance d2 less than the first distance d1. The ratio of the first distance d1 to the second distance d2 is between 9:1 and 6:4. Preferably, the ratio of the first distance d1 to the second distance d2 is configured to be 8:2.

When the vacuum pump 13 sucks the gas in the mold cavities 301 through the upper interface 35 and the lower interface 25 and discharges it to the outside, thereby forming a suction airflow, the paper pulp will enter the mold cavities 301 through the mold openings 302. At this time, the gas and the liquid in the paper pulp not only enter the upper air chamber 303 through the upper holes 34, and then discharge it to the outside through the upper interface 35 from the upper air chamber 303, but also enter the lower air chamber 20 through the lower holes 24, and then discharge it to the outside through the lower interface 25 from the lower air chamber 20. At the same time, the paper fibers in the paper pulp are adsorbed on the upper mold surface 31 and the lower mold surface 21, and are molded into a plurality of blanks 4 according to the shape of the mold cavities 301.

It is worth noting that the upper mold 3 and the lower mold 2 generate suction airflow through the vacuum pump 13, so that the paper fibers in the pulp adhere to the upper mold surface 31 and the lower mold surface 21. This is a known technology and is not a technical feature of the present invention. A person with ordinary knowledge in the field can infer the expanded details based on the above description, so no further explanation is given.

The characteristic of the present invention is that the flow rate and suction force of the suction air flow can be increased by the volume of the upper air chamber 303 and the lower air chamber 20. In addition, the upper port 35 is arranged near the mold cavities 301, rather than being arranged above the upper air chamber 303 along the vertical direction Z, so that the liquid in the paper pulp can be discharged from the upper port 35 immediately after entering the upper air chamber 303. In addition to not having to wait for the liquid to fill the upper air chamber 303, the liquid can be discharged and the suction force can be prevented from being affected by the liquid filling the upper air chamber 303.

In addition, by configuring the ratio of the first spacing d1 to the second spacing d2 to be 8:2, the liquid in the pulp is not limited by the volume of the upper air chamber 303, and can enter the upper air chamber 303 in large quantities and quickly. When the height of the liquid along the up-down direction Z accumulates to approximately equal to 1/4 of the height of the upper air chamber 303 along the up-down direction Z, it can be drawn away from the forming upper mold 3 through the upper interface 35.

It should be noted that the ratio of the first spacing d1 to the second spacing d2 is not limited to being configured as 8:2, and in other variations of the present embodiment, it can also be configured as 9:1, 7:3, or 6:4. In addition, the number of the mold cavities 301 is not limited to multiple, and in other variations of the present embodiment, it can also be 1 or arranged in only 1 row, and used to mold 1 blank 4, or to mold several blanks 4 arranged in 1 row. And the number of the upper interface 35 is not limited to only 1, and in other variations of the present embodiment, it can also be 2 or more than 2.

It is worth noting that the lower mold lower inner surface 23 of the molding lower mold 2 is not limited to being configured as a plane. In other variations of the present embodiment, it can also be configured as a slope with a lower center and higher surroundings and a roughly V-shaped cross section as shown in Figures 6 and 7. In this way, the liquid entering the lower air chamber 20 can flow toward the lower port 25 more quickly and more concentratedly. Similarly, the upper mold lower inner surface 33 of the molding upper mold 3 is not limited to being configured as a plane. In other variations of the present embodiment, it can also be configured as a slope with a higher center and lower surroundings and a roughly inverted V-shaped cross section as shown in Figures 6 and 7. In this way, the liquid entering the upper air chamber 303 can flow toward the upper port 35 more quickly and more concentratedly.

Through the above description, the advantages of the above embodiments can be summarized as follows:

1. The present invention can increase the flow rate and suction force of the suction airflow through the volume of the upper air chamber 303 and the lower air chamber 20, thereby improving the suction efficiency.

2. More importantly, the present invention can also design the upper interface 35 close to the mold cavities 301 so that the liquid in the pulp can be quickly discharged from the upper interface 35 after entering the upper air chamber 303, which can not only improve the stability during suction, but also further improve the suction efficiency.

However, the above is only an example of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the scope of the patent application and the content of the patent specification of the present invention are still within the scope of the present patent.

1: Paper plastic molding machine 11: Frame unit 12: Pulp barrel 13: Vacuum pump 2: Molding lower mold 20: Lower air chamber 21: Lower mold surface 22: Upper inner surface of lower mold 23: Lower inner surface of lower mold 24: Lower channel 25: Lower interface 3: Molding upper mold 301: Mold cavity 302: Mold mouth 303: Upper air chamber 31: Upper mold surface 32: Upper inner surface of upper mold 33: Lower inner surface of upper mold 34: Upper channel 35: Upper interface 4: Blank Z: Up and down direction d1: First distance d2: Second distance

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is an incomplete front view illustrating an embodiment of the slurry suction mold of the present invention installed in a paper molding machine; FIG. 2 is a top view of the embodiment; FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2; FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2; FIG. 5 is a partially enlarged cross-sectional view of the embodiment; FIG. 6 is a cross-sectional view similar to FIG. 3, but the cross section of the lower inner surface of a lower mold is V-shaped, and the cross section of the lower inner surface of an upper mold is inverted V-shaped; and FIG. 7 is a cross-sectional view similar to FIG. 4, illustrating the flow of fluid toward a lower interface and an upper interface.

2: Molding lower mold

20: Lower air chamber

21: Lower die surface

22: Upper inner surface of lower mold

23: Lower inner surface of the lower die

24: Lower channel

25: Lower interface

3: Forming upper mold

301: Mold cavity

302: Die mouth

303: Upper air chamber

31: Upper die surface

32: Upper inner surface of upper mold

33: Lower inner surface of upper die

34: Upper channel

35: Upper interface

4: Blank material

Claims (9)

A pulp suction mold for a paper plastic molding machine, suitable for entering and exiting a pulp barrel containing paper pulp, the pulp suction mold comprises: a molding lower mold; and A forming upper mold, which defines at least one mold cavity for accommodating paper pulp with the forming lower mold, and at least one mold opening connecting the outside world and the at least one mold cavity. The forming upper mold also defines an upper air chamber located above the at least one mold cavity along a vertical direction, and includes a plurality of upper channels connecting the at least one mold cavity and the upper air chamber, and an upper interface connecting the outside world and the upper air chamber and opening toward one side. The upper interface is located at one end of the upper air chamber adjacent to the at least one mold cavity along the vertical direction, and is suitable for suction airflow to suck the paper pulp in the pulp barrel from the at least one mold opening into the at least one mold cavity, and to suck the gas in the at least one mold cavity and the liquid in the paper pulp into the upper air chamber through the upper channels, and then discharged from the upper air chamber through the upper interface. The slurry suction mold of the paper molding machine as described in claim 1, wherein the upper interface extends in a horizontal direction. The slurry suction mold of the paper molding machine as described in claim 1, wherein the molding lower mold includes a lower mold surface, and the molding upper mold also includes an upper mold surface, and the upper mold surface cooperates with the lower mold surface to define the at least one mold cavity and the at least one mold opening. A slurry suction mold for a paper molding machine as described in claim 3, wherein the molding upper mold also includes an upper mold upper inner surface far away from the at least one mold cavity, and an upper mold lower inner surface adjacent to the at least one mold cavity and defining the upper air chamber together with the upper mold upper inner surface, the upper interface is separated from the upper mold upper inner surface by a first distance, and separated from the upper mold lower inner surface by a second distance less than the first distance. A slurry suction mold for a paper molding machine as described in claim 4, wherein the ratio of the first spacing to the second spacing is between 9:1 and 6:4. As described in claim 4, the slurry suction mold of the paper molding machine, wherein the lower inner surface of the upper mold is configured as a slope with a low center and high surroundings and a cross-section that is roughly in the shape of an inverted V. A pulp suction mold for a paper molding machine as described in claim 1, wherein the molding lower mold defines a lower air chamber located below the at least one mold cavity along the up-down direction, and includes a plurality of lower channels connected to the at least one mold cavity and the lower air chamber, and a lower interface connected to the outside and the lower air chamber and located below the lower air chamber along the up-down direction, the lower interface is suitable for allowing suction air to pass through, and is suitable for sucking the pulp in the pulp barrel from the at least one mold opening into the at least one mold cavity, and sucking the gas and pulp in the at least one mold cavity, so that the gas and the liquid in the pulp enter the lower air chamber through the lower channels, and then are discharged from the lower air chamber through the lower interface. The slurry suction mold of the paper molding machine as described in claim 7, wherein the molding lower mold also includes an upper inner surface of the lower mold adjacent to the at least one mold cavity, and a lower inner surface of the lower mold far away from the at least one mold cavity and defining the lower air chamber together with the upper inner surface of the lower mold. As described in claim 8, the slurry suction mold of the paper molding machine, wherein the lower inner surface of the lower mold is configured as an inclined surface with a low center and high surroundings and a roughly V-shaped cross-section.

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