KR102080639B1 - Manufacturing method of shock absorbing device intergrated in product - Google Patents

Abstract

The present invention provides a method for manufacturing a shock absorbing device integrally embedded in a product, which comprises: a step of preparing first and second molds (11, 16) having a boundary portion of a random shape formed on at least any one inner surface of mutually facing inner surfaces; a step of forming first and second cover sheets (41, 46) having an area larger than the boundary portion and made of a polymer synthetic resin material on one surface of a first molding sheet (20) and the other surface of a second molding sheet (30), respectively, which are made of a polymer synthetic resin material; a step of mounting the first and second molding sheets (20, 30) on the first and second molds (11, 16), respectively, such that a corner portion of each of the first and second cover sheets (41, 46) is positioned outside the boundary portion formed on at least any one of the first and second molds (11, 16); a step of combining the first and second molds (11, 16) while the corner portion of each of the first and second cover sheets (41, 46) is positioned outside the boundary portion formed on at least any one of the first and second molds (11, 16), and a central portion of each of the first and second cover sheets (41, 46) is positioned on a central portion of the boundary portion formed on at least any one of the first and second molds (11, 16); a heating and molding step of forming an inner space of a predetermined size between central portions of the first and second cover sheets (41, 46) positioned inside the boundary portion formed on at least any one of the first and second molds (11, 16) while integrating the first and second molding sheets (20, 30) at the same time by heating the combined first and second molds (11, 16) to a predetermined temperature; and a step of demolding a product (1) from the first and second molds (11, 16).

Description

Manufacturing method of shock absorbing device integrated in a product structure {Manufacturing method of shock absorbing device intergrated in product}

The present invention relates to a method of manufacturing a shock absorber, and more specifically, to a long time stable durability and shock absorbing function by simply combining, pressing and heating various materials that can be reshaped without mediating a buffer device that is separately manufactured or configured. It relates to a method for manufacturing a shock absorber which is built in an integral structure in the product so as to secure.

The shock absorber is a means for absorbing and mitigating external shocks, and various kinds of shock absorbing mechanisms such as springs and hydraulic pressures are used. However, shock absorbing mechanisms using air are mainly used for daily necessities such as bags or shoes.

A representative example of a shock absorber using air is a structure in which a structure having a certain shape is sealed with a thin film as disclosed in FIG. 7. The structure may be made of a conventional foam, etc., and the air filled in the film is in harmony with the cushioning function of the built-in foam foam itself to absorb the external impact.

By the way, since the structure of the shock absorber of the structure itself is independent, there is a feature that is combined with the product is made separately from the specific product that the shock absorber is required. In this case, there is a problem in that the manufacturing process must be performed separately from the product, as well as the duplication of manufacturing process, and there is a problem of integrating with the product. This complexity has caused a problem of raising the product cost.

As an alternative to this, a technique as shown in FIG. 8 is proposed. This technique forms an opening in the cover member 100 and then combines the thin film 104 to one side of the opening, and the upper mold is combined with the lower mold while the other side of the opening is placed in the lower mold. Thus, the resin solution is injected into the space between the other side portion of the cover member 100 and the upper mold inner surface and crosslinked foaming.

In this case, the resin forms a pad member 108 that forms an integral structure with the cover member 100, but a part of the resin is pushed into the opening of the cover member 100 in the foaming process, so that the buffer unit 110 is formed. There is this. In other words, even if a shock absorber is not manufactured separately from the product, the foamed shock absorber may be embodied in a single foaming process through a mold.

However, in this technology, since the shape and size of the buffer part are determined according to the specific shape and size of the opening formed in the cover member itself forming part of the product, the material forming the space of the opening itself or forming the pad member is large. Except for the method of differentiation, there was a limit to increasing the buffer function of the product.

Republic of Korea Patent No. 0442662 Republic of Korea Patent Publication No. 2013-0117468

The present invention has been proposed to improve the problems of the prior art, and an object of the present invention is to provide a method of manufacturing a shock absorber that can exert a predetermined level or more of buffer function in a state of being integrated with a product through a simple single heating molding process. In providing.

In order to achieve the above object, the present invention comprises the steps of preparing a first, second mold (11, 16) in which a boundary of any shape is formed on the inner surface of at least one of the mutually opposing inner surfaces; Preparing each of the first and second molding sheets 20 and 30 made of a polymer synthetic resin material; An area larger than the boundary formed on the inner surface of at least one of the first and second molds 11 and 16, wherein the surface of each of the first and second molds 11 and 16 is formed of a polymer synthetic resin material on one surface of the first molding sheet 20 and the other surface of the second molding sheet 30, respectively. Forming each of the first and second cover sheets 41 and 46 having a diameter; The first and second molding sheets 20 and 30 such that corner portions of the first and second cover sheets 41 and 46 are located outside the boundary formed on at least one of the first and second molds 11 and 16. Placing each in each of the first and second molds (11, 16); Corner portions of each of the first and second cover sheets 41 and 46 are positioned outside the boundary formed on at least one of the first and second molds 11 and 16, and the first and second cover sheets 41 and 46 are formed. Combining the first and second molds (11, 16) with each center located at the center of the boundary formed on at least one of the first and second molds (11, 16); The edges of the first and second cover sheets 41 and 46 which face each other while simultaneously integrating the first and second molding sheets 20 and 30 by heating the combined first and second molds 11 and 16 to a predetermined temperature. The part is sealed and a predetermined size internal space is formed between the central portions of the first and second cover sheets 41 and 46 located inside the boundary portion formed in at least one of the first and second molds 11 and 16. Heating forming step; It characterized by the technical features that comprises a; demolding the product 1 from the first, second molds (11, 16).

The boundary portion formed on the inner surface of any one of the first and second molds 11 and 16 may be formed of any one of a partition wall protruding and forming a closed circuit, or a recessed groove having a predetermined depth.

In this case, the barrier ribs may face each other on the inner surfaces of the first and second molds 11 and 16 and protrude to a predetermined vertical height.

When the first and second molds 11 and 16 are integrated, end portions of the partition walls which protrude to a predetermined vertical height and face each other may be formed to be spaced apart from each other by a predetermined interval.

At least one coupling pillar may protrude from each of the partitions or recesses.

At least one of the first and second molding sheets 20 and 30 may be formed with a linear molding corresponding to a boundary shape formed in any one of the first and second molds 11 and 16.

In addition, a through part may be formed in any one of the first and second molded sheets 20 and 30.

In addition, a third molding sheet 60 is interposed between the first and second molding sheets 20 and 30, and the third molding sheet 60 has one of the first and second molds 11 and 16. The boundary hole 61 corresponding to the boundary portion formed on the inner surface may be formed.

Corner portions of the first and second cover sheets 41 and 46 that face each other may be coupled to each other, and an air-filled expansion portion may be formed at the central portion to be positioned between the first and second molding sheets 20 and 30. Can be.

In the step before combining the second mold 16 with the first mold 11, one surface of the first cover sheet 41 of the first molding sheet 20 and the second cover of the second molding sheet 30 are formed. Positioning either the buffer structure 50 or the expansion aid 60 between the other surfaces of the seat 46 may be added.

Each of the first and second cover sheets 41 and 46 may be formed by applying or printing a melt to an arbitrary shape corresponding to one surface boundary of each of the first and second molding sheets 20 and 30, or may correspond to the boundary portion. Consists of a solid film having an arbitrary shape to be located on one surface of the first molding sheet 20 and the other surface of the second molding sheet 30.

The present invention can provide a stable operation and durability for a long time in that it is possible to implement a shock absorber that is integrated into the product through a single process, rather than providing a shock absorber as a separate component to combine with the product. Available products are available.

In addition, the present invention is not a method of crosslinking and foaming a solid or liquid molding material, but in a method of cutting a material capable of remolding to an arbitrary size and placing it in a mold to simply press and heat the product productivity. It is possible to improve as well as to reduce the production cost of the product.

In addition, the present invention can implement the shock absorber itself in any shape or structure, as well as the size of the shock absorber and the installation position in the product can be configured in various ways irrespective of the thickness of the product itself.

1a to 1f each show a schematic manufacturing process of a product according to the invention.
2A to 2D are different configuration diagrams of molds applicable to the present invention.
Figure 3a is another configuration of the first, second molding sheet applicable to the present invention.
Figure 3b is another configuration of the first, second molding sheet applicable to the present invention.
Figure 3c is another configuration of the first, second cover sheet applicable to the present invention.
Figure 3d is a combination configuration of the first, second cover sheet and the buffer structure applicable to the present invention.
Figure 3e is a combination configuration of the first, second cover sheet and expansion aid applicable to the present invention.
Figure 3f is a schematic view of the first, second, third molding sheet and the first, second cover sheet applicable to the present invention.
4A is a cross-sectional view of a mold in which first and second molding sheets including the first and second cover sheets disclosed in FIG. 3B are placed and molded.
4B is a cross-sectional view of a mold in which the first and second molding sheets including the first and second cover sheets and the shock absorbing structure disclosed in FIG. 3C are placed and molded.
Figure 4c is a cross-sectional view of the mold molded in the expansion aid is placed between the first and second cover sheets disclosed in Figure 3e.
FIG. 4D is a cross-sectional view of a mold in which the first, second and third molding sheets disclosed in FIG. 3F and the first and second cover sheets are placed and molded. FIG.
Figures 5a and 5b each is a schematic appearance configuration and cross-sectional configuration diagram for one product made in accordance with the present invention.
Figures 6a and 6b each of the schematic appearance and cross-sectional configuration of another product made in accordance with the present invention.
Figure 7 is a schematic configuration diagram of a conventional shock absorber.
8 is a schematic configuration diagram of a product having a conventional shock absorber.

Preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings, in which the embodiments of the present invention are not directly related to the technical features of the present invention, or in the art to which the present invention pertains. The detailed description of the matters apparent to those with knowledge of the present invention will be omitted.

The present invention has a technical feature to propose a method for manufacturing a shock absorber comprising a mold preparation step, a molding sheet preparation and a cover sheet forming step, a mold placing step of the molding sheet, a heat forming step of the mold, a demoulding step of the product. . Look at each step in detail.

First, prepare a mold. The mold may be formed of first and second molds 11 and 16 facing each other and molding as shown in FIG. 1A. At this time, an arbitrary shape boundary is formed on at least one of the inner surfaces 12 and 17 of the first and second molds 11 and 16 which face each other.

The boundary part is a part for forming a shock absorber in the product, and in the present invention, the boundary part may be formed on at least one mold inner surface, and the boundary part formed on the mold inner surface may be formed of any one of partition walls and recessed grooves.

In the former case, the partition wall protrudes at a predetermined vertical height from the mold inner surface 17 of any one of the first and second molds 11 and 16 (see FIG. 2A), or the first and second molds 11 and 16. Each of the inner surfaces 12, 17 may be made of any of the configurations that face each other and protrude at a certain vertical height (see FIG. 1A).

At this time, when the first and second molds are molded in a state in which the partition wall protrudes at a predetermined vertical height from one of the first and second molds or both of the molds, the end and the end of the partition wall formed in the first mold are formed. It is preferable that the gap between the inner surface of the two molds, or the end of the partition wall formed in the first mold and the end of the partition wall formed in the second mold is formed in a form that can be maintained at a predetermined interval.

FIG. 1A illustrates a case in which partition walls 13 and 18 are formed on inner surfaces of each of the first and second molds 11 and 16. When the first and second molds 11 and 16 are combined, each partition wall as shown in FIG. 13, 18) is preferably formed so as to maintain a predetermined interval between the ends. Although not shown, when the partition wall is formed on the inner surface of any one of the first and second molds, the partition wall is preferably formed to maintain a predetermined distance between the partition wall end of one mold and the inner surface of the other mold.

The reason why the present invention proposes such a configuration of the partition wall is that when the first and second molds are molded together, the first and second molding sheets and the first and second cover sheets in which the ends of the partition walls facing each other are laminated at the same time are simultaneously pressed. In this state, when heat is transferred to the mold, the first and second molding sheets and the first and second cover sheets, which are pressed by the end portions of the partition walls, may be melted by the heat and pressure transmitted, and thus may be very tightly integrated. to be.

In this case, the partition wall protruding at a predetermined vertical height from the inner surface of the mold is preferably formed to form a closed circuit as shown in FIGS. 1A and 2A, respectively. This is to prevent the expanded air from being heated out during the formation of the shock absorber to escape to the outside, as well as to allow the shock absorber to perform a stable buffer function for a long time during the use of the product. Unlike the drawings, the barrier ribs may be configured in a single closed circuit.

When the boundary of the mold is formed of a partition wall forming a closed circuit and protruding at a certain vertical height, the partition wall forming the closed circuit may be formed of a plurality of closed circuits as shown in FIG. 1A or 2A, as well as a single closed circuit. . Whether to form a closed circuit in a single configuration or in a plurality of configurations is to be determined based on a comprehensive consideration of the material, thickness, and complete sealing of the edge of the shock absorber.

When the boundary portion of the mold is formed with recessed grooves as in the latter, it is preferable that the mold groove is formed with recessed grooves 19 having a predetermined depth on any one of the first and second molds 11 and 16. In FIG. 2B, an example in which the recessed grooves 14 are formed in the inner surface 12 of the first mold 11 is disclosed. However, in the present invention, the recessed grooves are formed in the inner surfaces of the first and second molds 11 and 16, respectively. Of course, it does not exclude the case where it is formed.

When the boundary portion is formed as a recessed groove, a wall 15 having a predetermined vertical height and forming a closed circuit may be formed around the recessed groove as shown in FIG. 2B. When the wall of the closed circuit is formed around the recessed groove, similarly to the aforementioned partition wall, when the buffered space is formed by the recessed groove, the edge of the buffered space is sealed, thereby preventing the air trapped inside the buffered space from escaping to the outside. It can prevent.

In addition, the present invention proposes a case in which at least one coupling pillar protrudes from each of the partition walls and the recessed grooves forming the boundary. 2c and 2d disclose examples in which coupling columns 131 and 141 are formed in the interior of the partition 13 and the interior of the recessed groove 14, respectively.

When the buffer space is formed inside the product by the partition wall or recessed groove, if a coupling column of constant vertical height is present inside the partition wall or recessed groove, the molded sheet and cover sheet facing up and down with the buffer space therebetween are joined. As the columns are coupled to each other to form an integrated structure, the buffer space may form a more rigid structure.

On the other hand, the present invention does not exclude a case in which the boundary portion formed on the inner surface of the mold is formed in an opening shape in a separate intermediate mold having a predetermined thickness, unlike what is disclosed in each drawing. That is, an intermediate mold, in which an opening of any shape is formed, is inserted between the first and second molds, and the opening formed in the intermediate mold serves to function as a boundary.

After the first and second molds are prepared, a molding sheet is prepared next. The molding sheet may be formed of the first and second molding sheets 20 and 30 having a predetermined thickness as shown in FIG. 1B. Each of the first and second molding sheets 20 and 30 is preferably made of a polymer synthetic resin material including a thermoplastic synthetic resin.

The first and second molding sheets may be formed of a foam made by foaming a solid thermoplastic synthetic resin or a solid or liquid polymeric synthetic resin, among the polymer synthetic resins. When the first and second molding sheets are made of a foam, the molding sheet intended in the present invention may be manufactured and used separately, as well as by cutting the foam produced by a certain thickness by a predetermined thickness.

Meanwhile, when each of the first and second molding sheets 20 and 30 is formed of a foam in which a polymer synthetic resin is foamed, the case in which the first and second molding sheets 20 and 30 are formed of a foam having a closed cell structure is not excluded. The foam produced by the foaming process is formed by attracting pockets of gas in the solid material, which are not interconnected in a closed cell structure. That is, the structure does not communicate with the gas pockets.

When each of the first and second molding sheets prepared according to the present invention is formed of a closed cell structure in which gas pockets do not communicate with each other, the air trapped at a predetermined pressure inside the shock absorber, which will be described later, may be formed on the surface of the first and second molding sheets. It is possible to more completely prevent the phenomenon of escaping to the outside through.

Meanwhile, in the present invention, in preparing the first and second molding sheets 20 and 30, any one of the first and second molds 11 and 16 is included in at least one of the first and second molding sheets 20 and 30. It does not exclude the case where a linear molded part corresponding to the boundary shape formed in this is formed and used.

If a linear molded part corresponding to the shape of the boundary formed in the mold is formed at a specific part of the molded sheet, and then the linear molded part is placed at the boundary of the mold, the linear molded part of the molded sheet is more completely formed in the heat forming step described later. It can be molded into the boundary shape of.

Since the linear forming operation for the molded sheet can be performed using any one of various methods well known in the art, a detailed description thereof will be omitted. 3A discloses an example in which a linear portion 22 corresponding to a boundary of a mold is formed in the first molding sheet 20.

In addition, the present invention proposes a case where the penetrating portion is formed in any one of the molded sheets selected from the first and second molded sheets 20 and 30. The through part formed in the molded sheet may have a single through groove configuration corresponding to the shape of the boundary portion formed in any one of the first and second molds 11 and 16, and a plurality of through grooves may be formed in the molded sheet. It may be made of a structure that is formed dispersed.

In the configuration in which the plurality of through grooves are formed by being dispersed in the molding sheet, the case is intensively formed in a specific portion of the molding sheet in correspondence with the portion of the boundary portion formed in any one of the first and second molds 11 and 16, It can be divided into a case where it is formed scattered sporadically throughout the molding sheet.

As such, when the through part is formed in any one of the first and second molded sheets 20 and 30, the through part is a window for exposing one side of the shock absorber embedded in the product to the outside. It can function as an element that promotes the design element of a product.

3B discloses an example of a single through groove 26 among the through portions formed in the molded sheet, but the single through groove 26 is preferably formed to have a smaller area than the boundary portion formed in the mold. Do. This is to prevent the phenomenon that the shock absorber protrudes or escapes through the through groove.

When the first and second molding sheets 20 and 30 are prepared, the first and second cover sheets 41 and 46 may be formed on one surface of the first molding sheet 20 and the other surface of the second molding sheet 30 as shown in FIG. 1B. ) To form each. Each of the first and second cover sheets 41 and 46 preferably has a shape corresponding to the boundary formed in the mold, and the size of the first and second cover sheets 41 and 46 is preferably formed to have a relatively larger area than the boundary.

That is, the edge portion of the boundary formed in the mold is positioned in the first and second cover sheets formed in the first and second molding sheets, respectively. When the boundary portion of the mold is formed at the corner of the buffer space, the first and second cover sheets are coupled to each other with a predetermined width to prevent the air from escaping from the inside of the buffer space, and the buffer space itself is closed from the outside. This is to induce to form a space.

In this case, each of the first and second cover sheets 41 and 46 is preferably made of a polymer synthetic resin material including a thermoplastic synthetic resin. This is to facilitate melting and bonding of corner portions of each of the first and second cover sheets 41 and 46 which are disposed to face each other by heat transferred to the mold in the heat forming step for the mold to be described later.

The first and second cover sheets 41 and 46 may be formed on each of the first and second molding sheets 20 and 30 by any of methods using a liquid material or a solid material. The former may be formed by various methods such as liquefied polymer synthetic resin such as PU or TPU or polymer synthetic rubber such as silicone rubber, using a brush, spraying using a spray, or printing using a screen.

The latter is a method of laminating a polymer synthetic resin film prepared in an arbitrary shape, such as TPU, attaching or placing a transfer paper made of polymer synthetic rubber to each of the first and second cover sheets, or laminating a sheet made of rubber material in an arbitrary shape. It may be formed of any one.

Meanwhile, in the present invention, each of the first and second cover sheets may be formed of a plurality of structures instead of a single structure. That is, the liquid material of different physical properties is applied in multiple layers, the TPU films of different physical properties are laminated in multiple layers, or it is formed by combining solid and liquid materials.

According to the present invention, when each of the first and second cover sheets 41 and 46 is formed on one surface of the first molding sheet 20 and the other surface of the second molding sheet 30, the first and second cover sheets 41 and 46 are formed. ) It is not excluded to form the addition of a bubble liquid (not shown) to each of one side and the other side.

The foam liquid is a foaming agent contained in a polymer synthetic resin such as rubber or urethane, and when the heat is transferred to the mold in the heat forming step to be described later, the foaming agent contained in the foam liquid formed in the first and second cover sheets 41 and 46. Gas is generated in the process of decomposition, and the generated gas acts as a means for expanding the internal space of the shock absorber to a certain pressure, thereby maintaining the shape of the shock absorber more stably.

In addition, the present invention does not exclude a case where the first and second cover sheets 41 and 46 have a configuration in which an expansion portion is formed at a central portion thereof. That is, as shown in FIG. 3C, the corner portions of the first and second cover sheets 41 and 46 that face each other are coupled to each other, and the center portion is formed of an expanded portion 43 filled with air. That's it.

Instead of separately forming the first and second cover sheets 41 and 46 on the first and second molding sheets 20 and 30, as shown in FIG. 3C, the first and second cover sheets 41 and 46 are mutually coupled to each other to form a mold. If the expansion portion 43 is formed to be accommodated at the boundary portion of the function of the shock absorber formed in the interior of the final product can be further enhanced by the expansion portion 43.

Unlike the example disclosed in FIG. 3C, the present invention forms the first and second cover sheets on each of the first and second molding sheets as shown in FIG. The case of mediating between two cover sheets is not excluded. In other words, separate cover sheets having inflated portions are overlapped and positioned between the cover sheets.

In this case, when the edges of the first and second cover sheets are coupled to each other in the heat forming step to be described later to form a shock absorber, the separate seat cover having an expansion part inside the shock absorber formed by the first and second cover sheets. By means of an auxiliary buffer. That is, the shock absorber is composed of a buffer of a dual structure can be expected to further enhanced shock absorbing function.

Meanwhile, the present invention does not exclude a case in which the third molding sheet 60 is mediated between the first and second molding sheets 20 and 30, as disclosed in FIG. 3F. In this case, a boundary hole 61 is formed in the third molding sheet 60, and each of the first and second cover sheets 41 and 46 is formed or positioned on any one surface of the first and second molding sheets 20 and 30. can do. The material of the third molding sheet may be substantially the same as the first and second molding sheets.

The boundary hole 61 formed in the third molding sheet 60 is preferably formed in a shape corresponding to the boundary portion formed on the inner surface of any one of the first and second molds 11 and 16, and the boundary hole 61. Is preferably made smaller than the size (area) of the boundary formed in the mold.

Accordingly, when the first and second molds 11 and 16 are molded together, the first and second molding sheets 20, among the first, second and third molding sheets 20, 30 and 60, are formed inside the boundary of the mold as shown in FIG. 4D. , 30) and the boundary hole 61 of the third molding sheet 60 are positioned, and the first, second, and third molding sheets 20, 30, and 60 are sequentially stacked and pressed outside the boundary of the mold.

In addition, the corners of each of the first and second cover sheets 41 and 46 are located between the second and third molding sheets 30 and 60 or between the third and first molding sheets 60 and 20 (in FIG. 4D). The latter case is disclosed), and the central portion of each of the first and second cover sheets 41 and 46 is located inside the boundary of the mold.

In addition, in the present invention, when the first and second first cover sheets 41 and 46 are formed on one surface of the first molding sheet 20 and the other surface of the second molding sheet 30, as shown in FIG. However, the case of mediating the buffer structure 50 having a constant volume between the two cover sheets 41 and 46 is not excluded.

The buffer structure 50 forms a part of the shock absorber and may function as a means for supplementing the buffer function. At this time, the buffer structure 50 may be configured to correspond to the shape of the boundary formed in the mold. That is, the inside of the first and second cover sheets 41 and 46 without departing from the corners of the first and second cover sheets 41 and 46 formed in the first and second molding sheets 20 and 30, respectively. It is preferably made of a shape or size that can be arranged.

In addition, as the name suggests, it is preferable that the buffer structure 50 is made of an elastic body capable of absorbing and alleviating an external force applied thereto, and in particular, may be formed of a foam in which a polymer synthetic resin is foamed. When the buffer structure 50 is made of a foam, it is preferable that the buffer structure 50 is made of a foam having an open cell structure.

As described above, the foam produced through the foaming process forms a plurality of gas pockets in the solid material, and the open cell foam is interconnected with each of these gas pockets filled with air. Accordingly, the foam of the open cell structure is characterized by being easily compressed according to the flow of air through the gas pocket.

The reason why the present invention proposes an open cell structure when the buffer structure is made of foam is that it can capture more air than the foam of the closed cell structure, which makes it very easy to shape the buffer in the heat forming step. This is because it is of course possible to maintain the shape of the shock absorber for a long time.

On the other hand, the present invention instead of mediating the buffer structure 50 having a certain volume between the first, second cover sheets 41, 46 to mediate at least one or more expansion aids 60 as disclosed in Figure 3e. The case is not excluded.

The expansion aid 60 may be formed of a film having an arbitrary shape having a predetermined size of a receiving space therein, and a material filling the inner space of the film. The film is preferably made of a material that is relatively easily melted when the heat is applied, or is easily broken by the expansion pressure of the material filled therein. The material that fills the interior space of the film may be air or any gas.

When heat is transferred to the mold in the state where the expansion aid 60 is mediated between the first and second cover sheets 41 and 46, the film is melted or ruptured by the heat transferred as shown in FIG. 4C, and thus the inside of the film. Air or gas that has been filled in diffuses into the interior of the shock absorber at a constant pressure. That is, the expansion aid serves as an auxiliary means for expanding the internal space of the shock absorber.

When the first and second cover sheets 41 and 46 are formed on one side and the other side of each of the first and second molding sheets 20 and 30, respectively, as shown in FIG. 1C, the first and second molding sheets 20 are formed. 30) each of which is placed in each of the first and second molds 16 and 11. At this time, the corner portions of each of the first and second cover sheets 41 and 46 are placed so as to cover all the edge portions of the boundary portion formed in the mold.

When the first and second molding sheets 20 and 30 are placed in the first and second molds 11 and 16, respectively, the first and second molds 11 and 16 are molded. When the first and second molds 11 and 16 are integrated, the first and second molding sheets 10 and 20 and the first and second cover sheets 41 and 46 which face each other are in close contact with each other.

When the boundary portion of the mold is formed of the partitions 13 and 18 as shown in FIG. 1D, the portions between the partitions 13 and 18 corresponding to the inside of the boundary portion are closely contacted with the first and second cover sheets 41 and 46 facing each other. The first and second molding sheets 10 and 20 and the first and second cover sheets 41 and 46 are respectively partitioned between the ends of the partition walls 13 and 18 corresponding to the corners at the boundary of the mold. Is pressed in a pressurized state.

In this state, the molded first and second molds 11 and 16 are heated. The heating of the mold is preferably heated to an appropriate melting temperature that can melt each of the molding sheet and the cover sheet. When heat is transferred to a mold that is molded at a constant pressure, the first and second molding sheets 20 and 30 which are in contact with each other, and the first and second which are opposed to each other at edges (partition walls in FIG. 1D) at the boundary of the mold. The corner portions of each of the cover sheets 41 and 46, and the first molding sheet 20, the first cover sheet 41, and the second molding sheet 30 and the second cover sheet 46, respectively, are melted and integrally formed. Combined.

An adhesive layer may be further formed on corner portions of the first and second cover sheets 41 and 46 that face each other before the first and second molds 11 16 are combined. In this case, corner portions of the first and second cover sheets 41 and 46 may be more closely coupled. The adhesive layer may consist of conventional hot melts.

On the other hand, a certain amount of air remains between the first and second cover sheets 41 and 46 which face each other at portions between the partitions 13 and 18 corresponding to the inside at the boundary of the mold. When the molded sheet and the cover sheet are melted together to be integrally coupled to each other, the air remaining between the first and second cover sheets 41 and 46 which are opposite to each other at the portion between the partition walls 13 and 18 may be removed by heat transferred. It expands like 1e.

This expansion of air remaining between the first and second cover sheets 41 and 46 may be achieved by combining the first and second cover sheets 41 and 46 as well as the first and second molding sheets 20 and 30 respectively. , Push out to the inner surface of the partition (13, 18) of the two mold (11, 16). Accordingly, a predetermined size buffer space having an arbitrary shape is formed integrally with the product at a portion between the partition walls 13 and 18 corresponding to the inside of the boundary of the mold.

FIG. 4A illustrates a case in which the mold is heated by using the first and second cover sheets 41 and 46 in which the expansion part 43 is formed, and FIG. 4B illustrates a gap between the first and second cover sheets 41 and 46. The case of heating the mold through the buffer structure 50 is shown.

In the case of using the first and second cover sheets 41 and 46 in which the expansion part 43 is formed, the buffer space between the partitions 13 and 18 may be more easily formed, and the first and second cover sheets ( When the buffer structure 50 is mediated between the 41 and 46, the formation of the buffer space between the partitions 13 and 18 can be made more easily, and can ensure a more stable buffering action for a long time.

Further, rather than simply forming only the first and second cover sheets 41 and 46 to heat the mold, adding an air bubble to each surface of the first and second cover sheets 41 and 46 facing each other, As the contained material evaporates, the expansion pressure thereof may be increased to more easily form a buffer space.

When the above process continues for a predetermined time while the heat is transferred to the mold molded at a constant pressure, the first and second cover sheets 41 and 46 are respectively caused by the air expansion between the first and second cover sheets 41 and 46. Each of the first and second molding sheets 20 and 30 positioned at the lower side and the upper side of the mold is formed into a boundary shape of a mold, and is formed in a predetermined shape by the pressure of the air that is expanded between the first and second cover sheets 41 and 46. A buffer space is formed.

That is, unlike the conventional method, a shock absorber is stably absorbed for a long time by simply placing a previously produced foam (molding sheet, buffer structure, etc.) inside the mold without pressing a separate shock absorber and combining it with a product. In addition to being able to easily disperse and disperse, the shock absorber that can further enhance the elasticity of the product itself is built in the integrated structure with the product.

Meanwhile, in the present invention, when the buffer structure 50 is interposed between the first and second cover sheets 41 and 46, the first and second cover sheets 41 and 46 contact each of the lower surface and the upper surface of the buffer structure 50. The case where a non-adhesive layer is formed in each surface is not excluded. The non-adhesive layer may be made of any one of a release agent widely used in the related art, such as silicon ink.

The non-adhesive layer is a part for excluding the coupling between the buffer structure 50 and the first and second cover sheets 41 and 46, and the first and second cover sheets 41 are formed by heat transferred to the mold in the above-described heat forming step. , 46, when a buffer space is formed by expansion of air, each of one surface of the first cover sheet 41 and one surface of the second cover sheet 46 engages with each of the lower surface and the upper surface of the buffer structure 50. To prevent interference with the expansion of the air.

When the expansion aid 60 is mediated instead of the buffer structure 50 between the first and second cover sheets 41 and 46, the first and second cover sheets 41 and 46 are formed by heat transferred to the mold as shown in FIG. 4C. When the air between the first and second forming sheets 20 and 30 positioned below and above each of the first and second cover sheets 41 and 46 is formed into a boundary shape of the mold, In addition, the expansion aid 60, which is mediated between the two cover sheets 41 and 46, is ruptured by the heat transferred to facilitate the formation of a buffer space while the air or gas filled therein is diffused at a predetermined pressure.

Meanwhile, as shown in FIG. 4D, the first and second molds 11 and 16 are formed in a state in which the third molding sheet 60 in which the boundary hole 61 is formed is interposed between the first and second molding sheets 20 and 30. When molded and heated, the corner portions of each of the first and second cover sheets 41 and 46 are integrated with the third and first molding sheets 60 and 20, and the centers of the first and second cover sheets 41 and 46 are respectively integrated. The part is free to expand along the space of the boundary hole 61.

That is, unlike the case of FIG. 4A described above, a cavity corresponding to the volume of the through hole 61 of the third molding sheet 60 is provided between the boundary portions of the molded mold, and between the first and second cover sheets 41 and 46. The remaining air is further expanded by the extra volume provided by the through hole 61 to form a shock absorber.

Thereafter, the heat supply to the mold is stopped and the second mold 16 is opened from the first mold 11 to demold the product from the mold. When the product is demolded through such a process, the product 1 having the shock absorber 3 embedded therein is finally implemented as shown in FIG. 1F. Reference numeral 4 is a sealing line formed by the partitions 13 and 18 to separate the corner portion of the shock absorber 3 from the peripheral portion.

A cooling step for the mold may be performed before demolding the product from the mold. When the first and second molding sheets constituting the product are formed of a molding material of PE and EVA series, it is preferable that a cooling step is performed before the demolding of the product, and the first and second molding sheets are formed of a PU-based molding material. It is preferable to omit the cooling step. That is, it is preferable to determine whether to perform the cooling step in consideration of the material properties and formability of the molded sheet.

FIG. 5A shows an example of a specific product 1 manufactured using the first and second molds 11 and 16 having the above-described structure and the first and second cover sheets 41 and 46 in the form of a solid film. 5b shows the cross-sectional structure of the product 1. According to this, the shock absorber 3 by the 1st, 2nd cover sheets 41 and 46 is formed integrally with the product 1, and is built in the product 1, The edge part of this shock absorber is a partition of a metal mold | die ( It can be seen that it is isolated from the surrounding by the sealing line (4) by 13, 18.

In addition, as shown in the cover sheet buffer 3 'formed at the center of the first and second cover sheets 41 and 46, as shown in FIG. 5B, the actual buffer formed by the partition walls 13 and 18 of the mold. It can be seen that the volume of the space is formed much larger than the volume of the space between the partition walls 13 and 18 of the mold, which is trapped by the mold in which the expansion force by air is combined, and when the mold is suddenly opened, the first and the second This is because each of the molded sheets 20 and 30 is pushed outward.

That is, even if a separate housing is formed as in the conventional shock absorber and air is not filled with a predetermined pressure therein, the opposite cover sheet edges are bonded during the heating process for the molded mold, and the space therebetween remains. Due to the expansion of the mold to form a larger buffer space than the actual bulkhead space of the mold.

6A uses the first and second molds 11 and 16 of the structure shown in FIG. 2B and the first and second cover sheets 41 and 46 in the form of a solid film, and the buffer structure 50 of the open cell structure. Another example of the specific product 2 produced is shown, Figure 6b shows a cross-sectional structure of the product (2).

As shown in the figure, the shock absorber 3 is formed on the product 2 by the combination of the first and second cover sheets 41 and 46 and the shock absorbing structure 50, and the corner portion of the shock absorber 3 is formed in the mold. It can be seen that the sealing line 5 formed by the edge of the recessed groove 14 is isolated from the first and second molded sheets 20 and 30 around. The buffer space in this product 2 also has a larger volume than the recessed groove space of the actual mold due to the expansion of the air remaining between the buffer structure and the first and second cover sheets.

In the above description, but limited to preferred embodiments of the present invention, but this is only an example, the present invention is not limited to this may be modified and carried out in various ways, and further technical features based on the disclosed technical idea It will be apparent that it can be implemented in addition.

11, 16: 1st, 2nd mold 13, 18: bulkhead
14: recessed groove 20, 30, 60: 1, 2, 3 forming sheet
41, 46: first and second cover sheets 50: buffer structure
60: expansion aid

Claims (11)

Preparing first and second molds (11, 16) in which a boundary of any shape is formed on at least one of the inner surfaces facing each other;
Preparing each of the first and second molding sheets 20 and 30 made of a polymer synthetic resin material;
An area larger than the boundary formed on the inner surface of at least one of the first and second molds 11 and 16, wherein the first molding sheet 20 is formed of a polymer synthetic resin material on each of the one surface and the other surface of the second molding sheet 30. Forming each of the first and second cover sheets 41 and 46 having a diameter;
The first and second molding sheets 20 and 30 such that corner portions of the first and second cover sheets 41 and 46 are located outside the boundary formed on at least one of the first and second molds 11 and 16. Placing each in each of the first and second molds (11, 16);
Corner portions of each of the first and second cover sheets 41 and 46 are positioned outside the boundary formed on at least one of the first and second molds 11 and 16, and the first and second cover sheets 41 and 46 are formed. Combining the first and second molds (11, 16) with each center located at the center of the boundary formed on at least one of the first and second molds (11, 16);
The edges of the first and second cover sheets 41 and 46 which face each other while simultaneously integrating the first and second molding sheets 20 and 30 by heating the combined first and second molds 11 and 16 to a predetermined temperature. The part is sealed and a predetermined size internal space is formed between the central portions of the first and second cover sheets 41 and 46 located inside the boundary portion formed in at least one of the first and second molds 11 and 16. A heat forming step;
Demolding the product (1) from the first and second molds (11, 16);
A method of manufacturing a shock absorber that is built in an integrated structure in a product containing. The method of claim 1,
The boundary portion formed on the inner surface of any one of the first and second molds 11 and 16 is formed as an integral structure in a product, characterized in that it comprises any one of a partition wall protruding and forming a closed circuit, or a recessed groove having a predetermined depth. Method of manufacturing a shock absorber. The method of claim 2,
The partition wall is a manufacturing method of the shock absorber is built in a unitary structure in the product, characterized in that the inner surface of the first and second molds (11, 16) are opposed to each other and protrude to a certain vertical height. The method of claim 3,
When the first and second molds 11 and 16 are integrated, end portions of the partition walls which protrude to a predetermined vertical height and face each other are formed to be spaced apart from each other by a predetermined structure. Method of manufacturing a shock absorber. The method of claim 2,
At least one coupling pillar is formed in each of the partitions or recessed grooves protrudes. The method of claim 1,
At least one of the first and second molding sheets 20 and 30 is provided with a linear molding portion corresponding to the boundary shape formed in any one of the first and second molds 11 and 16. Method for manufacturing a shock absorber built in an integrated structure. The method of claim 1,
The first and second molded sheet (20, 30) of any one of the molded sheet is a manufacturing method of the shock absorber embedded in the integral structure in the product, characterized in that the through-hole is formed. The method of claim 1,
A third molding sheet 60 is interposed between the first and second molding sheets 20 and 30, and the third molding sheet 60 has an inner surface of any one of the first and second molds 11 and 16. Method for manufacturing a shock absorber is built in an integral structure in the product, characterized in that the boundary hole 61 is formed corresponding to the boundary formed. The method of claim 1,
The corner portions of the first and second cover sheets 41 and 46 that face each other are coupled to each other, and an air-filled expansion portion is formed in the central portion, and is positioned between the first and second molding sheets 20 and 30. Method for manufacturing a shock absorber that is built into the product in one piece structure, characterized in that. The method of claim 1,
In the step before combining the second mold 16 with the first mold 11, one surface of the first cover sheet 41 of the first molding sheet 20 and the second cover of the second molding sheet 30 are formed. Positioning the cushioning structure (50) or the expansion aids (60) between the other surface of the seat 46 is a method of manufacturing a shock absorber embedded in a unitary structure, characterized in that the addition. The method of claim 1,
Each of the first and second cover sheets 41 and 46 may be formed by applying or printing a melt to an arbitrary shape corresponding to one surface boundary of each of the first and second molding sheets 20 and 30, or may correspond to the boundary portion. Made of a solid film having an arbitrary shape to be located on one surface of the first molding sheet 20 and the other surface of the second molding sheet 30, characterized in that the manufacturing method of the shock absorber embedded in the integral structure in the product.

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