JPH1136200A - Pulp molded product, production of pulp molded product and apparatus for producing pulp molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a pulp molded product having both of the right side part and the back side part which are similarly smooth and a high dimensional accuracy and to provide both a method for producing the pulp molded product and an apparatus for producing the pulp molded product. SOLUTION: This pulp molded product 1 has the bottom 3 and a part of a sidewall part 5 formed into a double structure by joining the right side part 16 to the back side part 18. The right side part 16 and the back side part 18 are molded by using separate papermaking molds and all the top surface side 16a (i.e., the top surface 3a of the bottom 3, the inner surface 5a of the sidewall part 5, the top surface 7a of the top horizontal part 7 and the outer surface 9a of the hanging down part 9) and the undersurface side 18a of the back side part 18 (i.e., the undersurface 3b of the bottom 3 and the lower part 5b of the outer surface of the sidewall part 5) are molded by direct contact with the molding surfaces of the papermaking molds. Thereby, both the right side part 16 and the back side part 18 are similarly smooth and have a high dimensional accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pulp molded article suitable for use as a cushioning material or a partition interposed between various products and their packaging containers or between two or more products.
The present invention relates to a method for manufacturing a pulp molded article and a pulp molded article manufacturing apparatus.

[0002]

2. Description of the Related Art Conventionally, pulp molded products have been used as cushioning materials interposed between various products and their packaging containers. This type of pulp molded article is formed by forming a plurality of suction holes in a molding surface of a predetermined shape, and molding the molding surface with a paper net covering the molding surface. The pulp suspension was immersed in the suspension, and the pulp suspension was sucked through the suction hole to attach the pulp to the surface of the papermaking net. When the pulp was dewatered, a pulp molded product having a shape obtained by inverting the irregular shape of the molding surface of the papermaking mold could be obtained.

[0003]

However, in the above-mentioned conventional pulp molded product, a portion (hereinafter referred to as a front side portion) formed by directly contacting a molding surface of a papermaking mold is relatively smooth and has a high dimensional accuracy. Despite the high cost, pulp does not always adhere uniformly to the part that is on the back side of the part that directly contacts the molding surface of the papermaking mold (hereinafter referred to as the back side part). In addition, due to the influence of such irregularities, high dimensional accuracy cannot always be obtained. Therefore, when the packing operation is mechanized and automatic packing is performed, adverse effects such as an increase in the frequency of unsuccessful packing are caused. I was afraid.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a pulp molded product having both a front side portion and a back side portion which are similarly smooth and have high dimensional accuracy. An object of the present invention is to provide a production method and a pulp molded article production apparatus suitable for the production of pulp.

[0005]

Means for Solving the Problems and Effects of the Invention In order to achieve the above-mentioned object, the present invention provides a method of forming a plurality of suction holes in a molding surface having a predetermined shape, as described in claim 1. A mold formed by coating the molding surface with a paper net is immersed in a pulp suspension, and the pulp suspension is sucked through the suction holes to adhere pulp to the surface of the paper net. In the pulp molded article obtained by dehydration, the front side portion formed by the first mold making and the back side part formed by the second mold making are joined and integrated to form a mold. It is characterized in that the surface formed in direct contact with the surface is formed on both the front side and the back side.

[0006] According to the pulp molded article configured as described above, since both the front side portion and the back side portion are formed in direct contact with the molding surface of the mold, both the front side portion and the back side portion are formed. It is relatively smooth and has high dimensional accuracy. Therefore, there is no disadvantage that the appearance of the back side portion is poorer than that of the front side portion, and since good dimensional accuracy can be ensured, it is also suitable for automatic packing by a machine.

The pulp molded article of the present invention is characterized in that
As described in above, a structure in which a hollow portion is partially formed between the front side portion formed by the first mold and the back side formed by the second mold is also possible. it can. According to the pulp molded article in which such a hollow portion is formed, the impact can be absorbed by the collapse of the hollow portion, so that the pulp molded product has better buffer performance than the pulp molded product without the hollow portion.

The pulp molded article according to the first aspect described above can be manufactured by the method according to the third aspect. That is, the method for producing a pulp molded product according to claim 3 forms a plurality of suction holes in a molding surface having a predetermined shape, and forms a mold formed by covering the molding surface with a paper net into a pulp suspension. A method of manufacturing a pulp molded article by immersing, sucking a pulp suspension through the suction hole to adhere pulp to the surface of the papermaking net, and dehydrating the attached pulp. By immersing the pulp suspension in the pulp suspension and sucking the pulp suspension through the suction holes, the pulp to be the front side portion of the pulp molded article adheres to the surface of the netting, and the second pulp suspension is formed. By immersing the pulp suspension in the liquid and sucking the pulp suspension through the suction hole, the pulp to be the back side of the pulp molded article is adhered to the surface of the papermaking net, and the first and second molds are pulp suspended. The first and second papers are overlapped in a suspension. Are integrated by bonding pulp adhered to each of the forming surfaces of, removed from the first, while the pulp suspension in a superimposed state the second 抄型,
The pulp integrated between the first and second molds is dewatered.

According to this manufacturing method, the pulp to be the front side portion and the back side portion of the pulp molded article is adhered to each of the first and second molds, and the molding surface of each of the first and second molds is formed. Since the pulp attached to the pulp is joined and integrated and dewatered from the pulp, the surface formed in direct contact with the molding surface of the papermaking mold as described in claim 1 is provided on both the front side and the back side. A pulp molded article having the formed structure can be manufactured.

In particular, since the two papermaking molds are overlapped in the pulp suspension, the pulp suspension is sandwiched between the pulp adhered to the molding surfaces of the first and second papermaking dies. The two papermaking molds are superimposed in shape, and at that time, the pulp component in the pulp suspension sandwiched between the first and second
The pulp adhered to each molding surface is entangled with the pulp adhering to each molding surface, and the pulp separately adhering to the two papermaking molds is integrated without forming a clear joining surface. Therefore, the pulp adhering to the molding surfaces of the first and second molds can be joined without using glue or adhesive.

Further, in order to manufacture the pulp molded product according to the second aspect, as described in the fourth aspect, a part of the molding surface of the first and second molds is provided with the first and second molds. The distance between the molding surfaces of the two molds when the molds are overlapped is made larger than the thickness of the pulp adhering to the part, thereby forming a cavity in the part, By supplying a gas into the cavity through a gas supply passage communicating with the cavity, it is preferable to prevent a negative pressure from being applied to the cavity.

When the shapes of the molding surfaces of the first and second molds are designed as described above, the pulp adhering to the molding surfaces of the first and second molds is joined in a state where a cavity is secured. Because
A pulp molded article having a hollow portion as described in claim 2 can be manufactured. In particular, when such a hollow portion is formed, the pulp suspension remaining in the hollow portion decreases as the suction through the suction hole is performed in order to perform dehydration from the pulp. Since the negative pressure is applied, if the negative pressure is not eliminated properly, the cavity tends to be deformed in a direction in which the cavity is crushed by a pressure difference between the inside and the outside of the cavity, but in the present manufacturing method, the gas supply passage communicating with the inside of the cavity is formed. By supplying gas to the cavity through the cavity, negative pressure is prevented from being applied inside the cavity, so that the cavity is not crushed by the pressure difference between the inside and outside of the cavity, and good dimensional stability is provided. Can be secured.

In this manufacturing method, a hole is formed in a part of a wall surrounding the cavity for the purpose of providing a gas supply passage communicating with the cavity. If a gas supply path that can be supplied can be ensured, there is no need for an excessively large hole, and the buffer function of the hollow portion is not hindered. Desirably, a small hole is formed as much as possible by selecting a place where a load is unlikely to be applied among the wall surfaces surrounding the hollow portion.

Further, in producing a pulp molded article by the above-mentioned production method, it is preferable that
A storage tank for storing a pulp suspension, first and second molds each having a plurality of suction holes formed in a molding surface having a predetermined shape, and covering the molding surface with a paper net; A first operation of bringing the second mold into a separated state in the pulp suspension in the storage tank, a second operation of overlapping the pulp suspension in the storage tank, and A drive mechanism capable of executing a third operation of taking out the storage tank out of the storage tank in the aligned state, and suction through the suction holes formed in the first and second molds, thereby allowing the inside of the storage tank to be suctioned. When the pulp is attached to the surface of the papermaking net, while a pulp molded article manufacturing apparatus having a suction mechanism that promotes dehydration from the pulp attached to the surface of the papermaking net outside the storage tank, a driving mechanism is used. Controlling to perform the first operation and operating the suction mechanism More specifically, the pulp was attached to the first and second molds in the storage tank, and then the pulp was attached to the first and second molds by controlling the drive mechanism to perform the second operation. By joining the pulp and subsequently controlling the drive mechanism to perform the third operation, the first and second molds can be taken out of the storage tank and dewatered from the pulp. Therefore, a pulp molded article can be manufactured by the manufacturing method as described in claim 3, and as a result, a product of the present invention that has the desired quality can be manufactured at low cost.

After the pulp is dewatered, the operation of the suction mechanism is stopped, and the pulp molded product is removed from the first and second molds. The method of removing the pulp is optional. Further, in order to manufacture a pulp molded article by the manufacturing method as described in claim 4, in addition to the configuration of claim 5, a gas supply such as air can be supplied to a location to be a cavity. It is necessary to have a mechanism. Such a gas supply mechanism can be constituted, for example, by a gas supply pump and a pressure hose connected at one end to the gas supply pump and at the other end so as to protrude into the cavity. .

[0016]

Next, an embodiment of the present invention will be described with reference to an example. As shown in FIGS. 1A and 1B, the pulp molded article 1 shown as the first embodiment is:
A bottom portion 3 having a substantially rectangular shape when viewed from the top side, a side wall portion 5 continuously rising upward from the outer periphery of the bottom portion 3, an upper end horizontal portion 7 extending substantially horizontally outward from the upper end of the side wall portion 5, and an upper end horizontal portion The part 7 is constituted by a hanging part 9 that hangs down continuously from the outer periphery of the part 7. Of these, bottom 3
The side wall portion 5 is a portion serving as a container for accommodating various products therein, while the upper end horizontal portion 7 and the hanging portion 9 are provided when the pulp molded product 1 is stored in an outer box (not shown). In addition, it is a portion that functions as a spacer for securing a space between the outer box and a cushioning material that absorbs a shock while being crushed when receiving a shock from a side surface.

The side wall 5 has a slight draft to facilitate removal from the mold, and rises upward from the outer periphery of the bottom 3 while slightly expanding in the outer peripheral direction. Also, the hanging portion 9 is similarly provided with a draft angle, and hangs downward from the outer circumference of the upper end horizontal portion 7 while slightly expanding in the outer circumferential direction.

Further, a part of the bottom part 3 and a part of the side wall part 5 has a double structure formed by joining the front side part 16 and the back side part 18. The front side portion 16 and the back side portion 18 are formed by separate molding as described later, and are formed on the upper surface side 16a of the front side portion 16 (that is, the upper surface 3a of the bottom portion 3, the inner surface 5a of the side wall portion 5, and the upper end horizontal portion). The upper surface 7a of the portion 7 and the outer surface 9a of the hanging portion 9 and the lower surface 18a of the back portion 18 (that is, the lower surface 3b of the bottom 3 and the lower outer surface 5b of the side wall 5) are all in direct contact with the molding surface of the mold. The surface has been molded.

In FIG. 1B, the boundary between the front side portion 16 and the back side portion 18 is clearly shown for the sake of explaining that the bottom 3 and a part of the side wall 5 have a double structure. As shown, the front side portion 16 and the back side portion 18
Are made of pulp, and are joined by interposing pulp on the joining surface. Therefore, in practice, there is no boundary that allows the front side portion 16 and the back side portion 18 to be clearly distinguished. Instead, the front side portion 16 and the back side portion 18 are completely integrated.

Next, a method for producing the pulp molded article 1 will be described. The pulp molded article 1 can be manufactured by, for example, a pulp molded article manufacturing apparatus 20 as shown in FIG. The pulp molded article manufacturing apparatus 20 includes a first mold 21 for molding the front side portion 16 of the pulp molded article 1.
A second papermaking mold 22 for molding the back portion 18 of the pulp molded article 1; and a storage tank 24 for storing the pulp suspension L.
And a first drive mechanism 25 constituted by a mounting table 25a on which the first mold 21 is mounted and an air cylinder 25b.
And a second drive mechanism 26 constituted by a mounting table 26a on which the second mold 22 is mounted and an air cylinder 26b.
, A suction pump 28a and pressure-resistant hoses 28b, 28c
And a suction mechanism 28 composed of

Among these, the first mold 21 has a molding surface 21a having a shape obtained by inverting the unevenness of the upper surface 16a of the front side portion 16 of the pulp molded article 1, and a plurality of suction surfaces are formed on the molding surface 21a. A hole 21b is formed and the molding surface 21 is formed.
a is covered with a paper net 21c. The first mold 21 and the mounting table 25a form a decompression chamber 31 therebetween. Each of the suction holes 21b has a diameter of 2 to
3 mm, forming surface 2 of first mold 21 by drilling
1a side penetrates to the decompression chamber 31 side,
They are aligned or staggered at intervals of 20 mm.
Further, the papermaking net 21c is a metal mesh having a mesh fine enough to allow pulp to hardly pass and water to pass through, and is stretched so as to be almost in close contact with the molding surface 21a of the first papermaking mold 21, and is made of wire or electric welding. Is fixed to the molding body side.

The second mold 22 has a molding surface 22a having a shape obtained by inverting the irregularities on the lower surface 18a of the back portion 18 of the pulp molded product 1. The molding surface 22a has a plurality of suction holes 22b. Are formed, and the molding surface 22a is covered with a net 22c, and a decompression chamber 32 is formed between the molding surface 22a and the mount 26a. The suction hole 22
b, since the net making 22c is the same as that of the above-mentioned first paper making die 21, detailed description thereof will be omitted.

The first driving mechanism 25 moves the first mold 21 mounted on the mounting table 25a to an arbitrary position by expanding and contracting the air cylinder 25b.
Thus, the first papermaking mold 21 can be moved to an arbitrary position within a range from a position where it is immersed in the pulp suspension L to a position where it is taken out of the pulp suspension L. The second drive mechanism 26 also moves the second papermaking mold 22 in the same manner as described above. The second papermaking mold 22 is also moved from a position where it is immersed in the pulp suspension L to a position where it is taken out of the pulp suspension L. Can be moved to any position within the range.

Further, the suction mechanism 28 includes a pressure-resistant hose 28
b and 28c are connected to the mounting tables 25a and 26a such that one ends of the b and 28c are connected to the suction pump 28a and the other ends are connected to the above-described decompression chambers 31 and 32, respectively.
When suction is performed by the suction pump 28a, the decompression chamber 31,
A negative pressure is generated in the first mold 21 and the second mold 22.
The suction through the respective suction holes 21b and 22b is performed. In addition, the suction pump 28a switches the built-in valve (not shown), thereby reducing the pressure in the decompression chambers 31, 32.
The negative pressure can be generated in only one or both of them. Further, a positive pressure can be applied to only one or both of the decompression chambers 31 and 32. Instead of applying a positive pressure, it may be possible to open to the atmosphere.

Next, the operation of the pulp molded article manufacturing apparatus 20 will be described. First, a sufficient amount of the pulp suspension L is introduced into the storage tank 24. Pulp suspension L used here
Is, of course, new pulp suspended in water,
Depending on the application, waste paper may be dissolved in water and suspended, or both may be mixed.

Subsequently, the first drive mechanism 25 and the second drive mechanism 26 are operated to operate the first mold 21 and the second mold 2.
2 is immersed in the pulp suspension L. At this time, the first mold 21
And the second papermaking mold 22 are arranged in the pulp suspension L in the storage tank 24 with a space therebetween.

Subsequently, the suction mechanism 28 is operated to apply a negative pressure to both the decompression chambers 31 and 32. As a result, the pulp suspension L is sucked by the suction holes 21b and 22b on the molding surfaces 21a and 22a sides of the first and second molds 21 and 22, respectively. At this time, most of the pulp component in the pulp suspension L sucked into the nets 21c and 22c is
c, 22c. Further, the moisture and some fine pulp components pass through the nets 21c and 22c, and are sucked into the suction pump 28a from the suction holes 21b and 22b, through the pressure reducing chambers 31 and 32, and the pressure-resistant hoses 28b and 28c.

Then, as a result of operating the suction mechanism 28 for a certain time, if a sufficient amount of pulp adheres to the surfaces of the papermaking nets 21c and 22c, the first drive mechanism 25 and the second drive mechanism 26 are operated. First papermaking mold 21 and second papermaking mold 22
In the pulp suspension L in the storage tank 24.
At this time, the pulp adhering to the nets 21c and 22c is not yet solidified, and the pulp suspension L is further sandwiched between the pulp adhering to the nets 21c and 22c. The first papermaking mold 21 and the second papermaking mold 22 are superposed. Therefore, the pulp component in the pulp suspension L sandwiched and the pulp adhering to each of the papermaking nets 21c and 22c are entangled with each other.
Even without glue or the like, the pulp layers separately adhered to the papermaking nets 21c and 22c are integrated without forming a clear joining surface. In addition, since the pulp layer integrated here has a shape pressed between the first papermaking mold 21 and the second papermaking mold 22, the bulk density is increased, and when the extra space remains, In this case, the space is crushed, and the dimensional accuracy and dimensional stability of the molded product are improved.

Subsequently, the first drive mechanism 25 and the second drive mechanism 26 are operated, and the first mold 21 and the second mold 2 are operated.
2 are taken out of the storage tank 24 while being superposed. Also at this time, since the suction by the suction mechanism 28 is continuously performed, the moisture is removed from the pulp molded product 1 formed between the first mold 21 and the second mold 22.

After the water has been sufficiently removed, the suction pump 28a is controlled to stop applying a negative pressure to the decompression chamber 31, and the second drive mechanism 26 is operated in this state to The second mold 22 is separated from the first mold 21. At this time, since the negative pressure is continuously applied to the decompression chamber 32, the pulp molded article 1 remains in a state of sticking to the second mold 22 and is separated from the first mold 21. . Thereafter, the pulp molded article 1 is also separated from the second mold 22.

In addition, instead of separating the pulp molded article 1 from the second mold 22, the second paper mold 22 itself is replaced with the pulp molded article 1.
At the same time, it may be moved from the pulp molded article manufacturing apparatus 20 and sent to the next step. As described above, according to the pulp molded article 1, the portion having the double structure formed by joining the front side portion 16 and the back side portion 18 is formed in a form sandwiched between two molds. , Front side part 16
Both the upper surface 16a and the lower surface 18a of the back portion 18 are formed in direct contact with the molding surface of the mold, so that both are relatively smooth and have high dimensional accuracy.

For this reason, the back side portion 1 is compared with the front side portion 16.
There is no disadvantage that the appearance of 8 is bad. In addition, since the molded product has high dimensional accuracy, the frequency of occurrence of packaging errors is reduced even when packing is performed using an automatic packing machine. Also, unlike a pulp molded product having a myriad of small irregularities on the surface, it is unlikely that the pulp powder is generated due to the irregularities being scraped, and even if the product can be stored using the back side portion 18 The dimensional accuracy with the product is high and there is no play.

In addition, the double-structured portion formed in such a manner as to be sandwiched between the two molds has a pulp content of about 2%.
In addition, since the pulp has a high bulk density by being sandwiched between two molds, it has better strength and dimensional stability than usual.

Further, according to the pulp molded article manufacturing apparatus 20, the excellent pulp molded article 1 as described above can be produced very easily. In particular, when joining the front side portion 16 and the back side portion 18, the two pulp molds are merely overlapped in the pulp suspension, so that a pulp molded article having a double structure without using glue or an adhesive. 1 can be manufactured.

Next, another embodiment of the present invention will be described. In the second embodiment described below, the same components as those in the first embodiment described above are denoted by the same reference numerals used in the above description, and detailed description thereof will be omitted. As shown in FIGS. 3A and 3B, the pulp molded article 2 shown as the second embodiment is:
It has the same bottom portion 3, side wall portion 5, upper end horizontal portion 7, and hanging portion 9 as in the first embodiment, and further has a configuration different from that of the first embodiment, continuously from the lower end of the hanging portion 9. Reinforcing part 1 extending substantially horizontally inward and connected to side wall part 5
1 is provided. Further, the side wall portion 5, the upper end horizontal portion 7,
Cavity 1 surrounded by hanging part 9 and reinforcement 11
3 are formed.

The reinforcing portion 11 includes the bottom portion 3 and the side wall portion 5.
Part of the back side part 18 molded with a part of
The lower surface 11a of the reinforcing portion 11 is also a surface formed by directly contacting the molding surface of the mold. In addition, the reinforcing portion 11 includes:
A through hole 11b penetrating from outside to the cavity 13 is formed.

Next, a method for producing the pulp molded article 2 will be described. The pulp molded article 2 can be manufactured by a pulp molded article manufacturing apparatus 40 as shown in FIG. The pulp molded product manufacturing apparatus 40 includes a first papermaking die 21, a second papermaking die 22, a storage tank 24, and a first papermaking die 21 similar to those of the first embodiment.
Although a driving mechanism 25, a second driving mechanism 26, and a suction mechanism 28 are provided, the shape of the net 22c of the second die 22 is such that the reinforcing portion 11 can be formed. In addition, as a configuration different from the first embodiment,
A gas supply mechanism 41 including a gas supply pump 41a, a pressure-resistant hose 41b, and a metal tube 41c is provided.

The gas supply mechanism 41 has one end of a pressure-resistant hose 41b connected to a gas supply pump 41a and the other end connected to a metal tube 4a.
1c, and the other end of the metal tube 41c is connected to the net 22c.
, And is configured to supply air sent from the gas supply pump 41a from the other end of the metal pipe 41c. Although FIG. 4 shows one gas supply pump 41a, two sets of pressure-resistant hoses 41b, and metal tubes 41c, the numbers thereof can be changed as appropriate according to the shape of the molded product.

Next, the operation of the pulp molded article manufacturing apparatus 40 will be described. As in the case of the first embodiment, first, a sufficient amount of the pulp suspension L is introduced into the storage tank 24, the first drive mechanism 25 and the second drive mechanism 26 are operated, and the first The mold 21 and the second papermaking mold 22 are immersed in the pulp suspension L, and the suction mechanism 28 is operated to set the decompression chamber 3
A negative pressure is applied to both 1 and 32 to remove the pulp component from the net 21
adhering and depositing on the surfaces of c and 22c to form nets 21c and 22
When a sufficient amount of pulp has adhered to the surface of c, the first drive mechanism 25 and the second drive mechanism 26 are operated, and the first papermaking mold 21 and the second papermaking mold 22 are pulp suspended in the storage tank 24. Layer in liquid L.

Here, if this superposition is simply performed, when a portion corresponding to the hollow portion 13 of the pulp molded article 2 is formed, water is sucked from the inside of the hollow portion 13, and as a result,
Since the pressure in the hollow portion 13 is reduced, the portion serving as the hollow portion 13 may be crushed. However, in the pulp molded product manufacturing apparatus 40, two dies are superimposed at the same time. By operating the gas supply mechanism 41, air is supplied from the metal pipe 41c, and the collapse of the cavity 13 is prevented.

More specifically, since the end of the metal pipe 41c protrudes from the net 22c, the air supplied from the metal pipe 41c just flows into the hollow portion 13 of the pulp molded article 2. Become. Then, the inflow amount is adjusted to an amount substantially equal to the amount of water or air sucked by the suction mechanism 28 and flowing out from the inside of the hollow portion 13. Therefore, even if water or air is sucked from the inside of the cavity 13 by the suction mechanism 28, approximately the same amount of air flows into the cavity 13, and as a result, decompression in the cavity 13 is prevented. , Cavity 13 due to external pressure
Is prevented beforehand. In addition, the through-hole 11b formed in the reinforcement part 11 of the said pulp molding 2
Is a trace that the metal tube 41c has penetrated to the inside of the hollow portion 13.

Subsequently, the first drive mechanism 25 and the second drive mechanism 26 are operated to operate the first mold 21 and the second mold 21.
The papermaking molds 22 are taken out of the storage tank 24 while being superposed. At this time, since the air is continuously supplied to the cavity 13, it is possible to promote the removal of water from the pulp molded article 2 while preventing the pressure in the cavity 13 from being reduced.

After the moisture is sufficiently removed from the pulp molded article 2, the pulp molded article 2 can be removed in the same manner as in the first embodiment. As described above, according to the pulp molded article 2, the same effect as that of the first embodiment can be obtained, and by providing the reinforcing portion 11, the pulp molded product 2 can be viewed from the side surface of the hanging portion 9. Since the strength against impact is increased, the shock absorbing performance is superior to that of the first embodiment.

Further, according to the pulp molded article manufacturing apparatus 40, the excellent pulp molded article 1 as described above can be extremely easily manufactured. In particular, while preventing the cavity 13 from being crushed, A pulp molded article 2 having a hollow portion 13 can be manufactured. As described above, the embodiments of the present invention have been described. However, various specific embodiments other than those described above can be considered for the embodiments of the present invention.

For example, in the above embodiment, the pulp molded articles 1 and 2 having a specific shape are shown. However, the specific shape of the pulp molded article can be variously considered. Structures known in this type of pulp molded article, such as improving the buffering property of the pulp and providing a recess adapted to the product shape for storing the product, can be appropriately adopted in the pulp molded article of the present invention.

In the above embodiment, the pulp molded article 1
Of the bottom 3 and a part of the side wall 5 of the front side 16
Although the double structure is formed by joining the back portion 18 and the bottom portion 18, the bottom portion 3, the side wall portion 5, the upper horizontal portion 7, and the hanging portion 9 may have a double structure. A pulp molded product having a completely double structure as described above can be produced by using two papermaking molds each having a net formed over the entire molding surface.

[Brief description of the drawings]

FIG. 1 shows a pulp molded product according to a first embodiment, in which (a) is a front view and (b) is a longitudinal sectional view.

FIG. 2 is a structural view schematically showing a pulp molded article manufacturing apparatus according to the first embodiment.

3A and 3B show a pulp molded product according to a second embodiment, in which FIG. 3A is a front view and FIG. 3B is a longitudinal sectional view.

FIG. 4 is a structural view schematically showing a pulp molded article manufacturing apparatus according to a second embodiment.

[Explanation of symbols]

1, 2 ... pulp molded product, 3 ... bottom, 5 ... side wall, 7 ... top horizontal, 9 ... hanging down, 11 ...
・ Reinforcing part, 13 ・ ・ ・ Cavity part, 16 ・ ・ ・ Front side part, 1
Reference numeral 8: Back side portion, 20, 40: Pulp molded article manufacturing apparatus, 21: First mold, 22: Second mold, 21
a, 22a: molding surface, 21b, 22b: suction hole, 21c, 22c: netting, 24: storage tank, 2
5 first drive mechanism, 26 second drive mechanism, 28
... Suction mechanism, 31, 32 ... Decompression chamber, 41 ...
Gas supply mechanism.

Claims (5)

[Claims] 1. A mold formed by forming a plurality of suction holes in a molding surface having a predetermined shape and covering the molding surface with a paper net is immersed in a pulp suspension, and the pulp suspension is suspended in the suction hole. A pulp molded product obtained by sucking a liquid to adhere pulp to the surface of the papermaking net and dewatering the attached pulp, comprising: a front side part formed by the first papermaking die; By joining and integrating with the back side part formed by the above, the surface formed in direct contact with the molding surface of the papermaking mold has a structure formed on both the front side and the back side. Pulp moldings. 2. The pulp molded article according to claim 1, wherein a cavity is partially formed between a front portion formed by the first mold and a back portion formed by the second mold. A pulp molded product having a structure in which a portion is formed. 3. A mold formed by forming a plurality of suction holes on a molding surface having a predetermined shape and covering the molding surface with a paper net is immersed in a pulp suspension. A method of manufacturing a pulp molded article by sucking a liquid to adhere pulp to the surface of the papermaking net and dewatering the attached pulp; immersing the first papermaking mold in a pulp suspension; By sucking the pulp suspension through the hole, the pulp to be the front side of the pulp molded article is adhered to the surface of the papermaking net. The second mold is immersed in the pulp suspension, and the pulp is sucked through the suction hole. By sucking the suspension, a pulp to be the back side of the pulp molded article is adhered to the surface of the papermaking net, and the first and second molds are overlapped in the pulp suspension, Joining the pulp adhering to the molding surfaces of the first and second molds Removing the pulp from the pulp suspension while the first and second molds are overlapped, and dehydrating the pulp integrated between the first and second molds. A method for producing a pulp molded product, characterized by comprising: 4. The method for producing a pulp molded product according to claim 3, wherein the first and second molds are overlapped on a part of the molding surface of the first and second molds. By forming the distance between the molding surfaces of the two molds to be larger than the thickness of the pulp adhering to the portion, a cavity is formed in the portion, and a gas supply passage communicating with the cavity is formed. Supplying a gas into the cavity through the cavity to prevent a negative pressure from being applied to the cavity. 5. A storage tank for storing a pulp suspension, a plurality of suction holes formed in a molding surface having a predetermined shape,
First and second molds each having its forming surface covered with a paper net, and first and second molds each having the first and second molds separated in a pulp suspension in the storage tank. A drive mechanism capable of executing the first operation, a second operation of superimposing in the pulp suspension in the storage tank, and a third operation of taking out the storage tank outside in the superimposed state; By sucking through the suction holes formed in the second mold, the pulp adhered to the surface of the mesh in the storage tank, and adhered to the surface of the mesh outside the reservoir. An apparatus for manufacturing a pulp molded product, comprising: a suction mechanism for promoting dehydration from pulp.