KR200403971Y1 - Pulp mould and it's manufacturing method. - Google Patents

Abstract

The present invention relates to a mold for a pulp mold and a method for manufacturing the same. The conventional mold for molding pulp is made of aluminum or phosphor bronze by means of CNC machining or electric discharge machining, and makes the desired shape into a male and female. Process a number of holes to inhale the pulp solution. In this case, the pulp dissolved in the pulp solution is prevented from flowing out through the hole, and the mesh net is inserted into one side of the mold so as to be evenly distributed on the front surface of the mold. In this case, in order to prevent productivity degradation and defects due to the flow of the mesh network and to reduce the manufacturing cost of the mold, the mesh network was attached to the perforated plate having a certain void by attaching it.

The above method requires a lot of cost for the manufacture of the mold, and in general, it is about 300,000 shots in the injection mold, whereas when the mesh is used, the wire of the mesh is broken in only about 300 shots, Since the gap of the mesh becomes too narrow, the amount of suction of the pulp decreases and the thickness of the mold may become thin.

The present invention is for pulp mold sintered with metal beads of different sizes having an aperture ratio of at least 1/2 or less as a means to solve this problem. As a result, the durability is much improved compared to the case of using the mesh, especially the surface layer of the mold is very dense, and when the pulp mold product is molded, it has a uniform surface and thickness, and has a constant air gap and high air permeability for the pulp mold It relates to a mold and a method for producing such a mold, which requires several sets of the same shape.

Description

Mold for pulp mold and manufacturing method of mold {Pulp mold and it's manufacturing method.}

The present invention relates to a pulp mold mold and a method for producing the same, and in particular, a phase for preparing a preform for making a mold for pulp mold. The present invention relates to a method for producing a pulp mold mold of the same shape by sintering a preform made by laminating a mold and a spherical metal material on a mold.

In the conventional pulp mold forming system, a single mold is formed by, for example, a first mold 1 having a shaping shape and a second mold 2 having a shaping shape coupled to the first mold 1. Form. In order to form the pulp mold, a metal mesh is placed on the first mold 1, and when a pulp solution is supplied thereon, a vacuum pump is operated to suck water in the pulp solution and the heated second mold 2 descends to the first mold 1. When the mold 1 and the second mold 2 are in close contact with each other, a pulp molded product is obtained from the pulp interposed therebetween.

However, at this time, the pulp molding requires a heat drying time of 30 seconds or more in order to maintain an intact state as a product, and a process of heating and drying in a state where a certain form is maintained in order to improve productivity and prevent product quality and deformation. Required. Therefore, heated molds 3, 4, 5, and 6 having the same shape as the first mold 1 and the second mold 2 are required.

In addition, unlike the case of plastic injection, the pulp mold system requires a long unit production time, and a method using a plurality of molds is required to increase the yield. Therefore, one press system has models of as many as 48 molds of the same shape, and 144 sets of molds are required up to the third, fourth, fifth, and sixth molds for heat drying.

 In addition, in the case of welding the mesh to the perforated plate, the shape and the appearance of the product are not important as in the case of the cushion packaging material, but when using an automatic packaging machine such as a ramen container or a national container, a precise shape is required. If the mesh is damaged even a little, it must be changed, which requires a lot of time and money to mold the pulp mold.

Currently, the method for manufacturing a mold for pulp mold is almost similar to that of an injection mold, and is formed by CNC engraving and electric discharge machining. Since the injection mold of a plastic resin has proper fluidity, it is well dispersed when pressure is applied to give a desired thickness. In the case of pulp mold, if the distribution of pores is different in the process of vacuum suction, when the white water in the pulp solution is lost, the fiber conveying speed is different, resulting in uneven thickness. Almost none require more precise work than injection molds.

That is, in the manufacture of the mold for the pulp mold, the hole that sucks the pulp solution of the first mold 1 generally serves as a mill pin of the injection mold, and the first mold (1) is similar to washing the mill pin in the injection mold. If foreign matter remains in the hole, the flowability is changed, which leads to product defects. Therefore, it is preferable to wash each time after the pulp solution is aspirated. Therefore, how precise and well-distributed the hole is in the mold design and management of the pulp mold is a very important factor. In particular, the degree of contamination of the pulp mold hole is different depending on the characteristics of the fiber and the additives added to the pulp solution.If the hole is too small, the liquid film is formed due to the bubbles in the pulp solution or the difference in the surface tension. Sometimes it does not accumulate.

Due to this reason, more than 5% of defects are generated in the existing production process, and when the mesh is used, the mesh does not exist in the same shape as that of the product, but is present in a wide unfolded state with elasticity and resilience. Since the mold of the second mold and the first mold is maintained to maintain the shape, the mesh of the mesh is expected to stick less fiber, but if not frequently washed, the fiber is attached during the heat-drying process.

Therefore, the existing process requires periodic compressed air washing and water washing to wash the fibers attached to the first mold.

In order to compensate for the shortcomings of the conventional pulp mold in the pulp mold mold, 1) the suction of the pulp solution is achieved by varying the pore size of the surface and bottom layers of the mold, and 2) the pulp solution. After forming the mold by inhaling the mold, the pore area of the surface layer and the lower layer is changed so that the fibers attached to the mold can be easily detached, and 3) the productivity is improved by eliminating the process of attaching or inserting the existing mesh. Unlike using the mesh, it is possible to suck the pulp solution to be sucked with a uniform suction force to increase the uniformity of the product, to obtain the molds of 3, 4, 5, 6 in the same shape, and inexpensive and durable like the mesh In order to manufacture a high mold, a separate mold was produced to produce a pulp mold mold.

Looking at the cross section of the cup pulp container pulp mold according to the present invention in order to solve the problems with the existing molds and to achieve the above object, the bottom layer of the mold is large pores and the upper layer of the mold is small pores. Such a mold is obtained through a process of sintering through a preforming step.

That is, the method for obtaining a product having a structure as shown in Fig. 3 will be described in detail below. 1) Preparation of a mold for producing a preform for producing a pulp mold mold. -As a manufacturing process of upper and lower molds for the production of preforms, cutting is performed using a series of plastics without using difficult materials, or stacked and processed in a build-up method. 2) Laminated primary spherical metal material (low layer metal material). -In the production of a thin die-shaped mold that sucks the pulp solution in consideration of the shape of internal pores, metal beads having a large diameter are laminated. In the same way, the first mold laminations metal beads having a large diameter. 3) Lamination of Secondary Spherical Metallic Materials (Surface Layer Metallic Materials)-Laminate metal beads having a size less than half the diameter of at least the primary laminated metal material. 4) Molding of Preform-The laminated metal powder is manufactured under the pressure of 2-7 ton / cm 2. 5) Sintering of Preform-The molded product is heated to a temperature below the melting point to give the proper physical properties by diffusion bonding and alloying of metal particles. The present invention relates to a mold for forming a pulp mold and a manufacturing process thereof, which are manufactured through a five-step process as shown in FIG. 3, and the mold manufactured by the above process is compared with a conventional cutting or build-up mold. Productivity is good and dimension error between the same mold is small. In addition, the second mold and the third mold below the fourth, fifth, and sixth molds are also manufactured through the above process, and if necessary, the third, fourth, fifth, and sixth molds may be used. Beads of 10-50% smaller size than the raw metal beads are used to make the surface of the mold cleaner and to increase the production speed of the mold.

In the case of using the mold according to the present invention, since the raw material of pulp solution is distributed and sucked evenly compared to the mold using the existing mesh, there is little material defect, and in particular, the generation of pinholes due to air bubbles or clogging of the pulp solution little. In addition, there is no process for accurate settling of the mesh or a process for separating the mesh, which increases productivity and eliminates maintenance time due to frequent mesh burnout or replacement. In particular, unlike the method of using a conventional mold during drying, since the pores are formed in the heated mold, the evaporation of moisture is fast, so that drying is possible at least twice as fast as the conventional process, thereby increasing productivity.

In addition, as a side effect, the manufacturing cost of the mold is inexpensive, and there is little dimensional error between the molds, so that it is possible to obtain a product having a uniform standard.

1 is a cross-sectional view of the cup noodle container pulp mold according to the present invention

2 is a structural diagram of a pulp mold system

3 is a pulp mold production flow chart according to the present invention

Claims (3)

Process of the steps described in Fig. 3, namely 1) production of a mold for producing a preform for producing a pulp mold mold. 2) Laminated primary spherical metal material. 3) Secondary spherical metal material lamination. 4) Forming of Preform. 5) A mold for molding pulp mold prepared through the step of sintering the preform and a method for manufacturing the mold in the above step. The surface layer metal material (secondary spherical metal material) of the pulp mold mold is made of a material having a diameter of 1/2 or less of the material of the bottom layer (primary spherical metal material). The metal mold | die manufactured by the method of Claim 1 forms pores irrespective of X and Y, and has the characteristic of quick evaporation and drying rate of water.