KR101924608B1 - A float and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a float and a method of manufacturing the same, and more particularly, to a float consisting of a foamed material with improved internal strength and a method for manufacturing the same. The float of the present invention is formed by secondary foam molding of an outer member after primary foam molding of an inner member, thereby improving foam formation therein. The inner member is extended to a position adjacent to a linear member which connects the outer member to a fishing net or a connection structure so that an outer shape of the outer member is prevented from being changed and damaged due to pressure of the linear member, thereby improving durability thereof.

Description

A float and manufacturing method thereof < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag and a method of manufacturing the same, and more particularly, to a bag having an improved internal strength and a method of manufacturing the same.

It is used by the fisherman to install the net in the farm.

In general, foam polystyrene (styrofoam) is widely used. However, the styrofoam rich has advantages that it can be manufactured at a low cost, while it is weak in durability, and hydrolysis is prolonged when exposed to seawater for a long time, which causes easy pollution and environmental pollution.

In recent years, in order to solve such a problem, it has been proposed to use a variety of constituent parts such as an improved supplement for a seafood culture of Korean Patent Registration No. 10-0615453 and an improved structure of a sealable rich portion for a reasonable production of Korean Patent Registration No. 10-0903073 Which is constructed by covering the outer surface of a conventional styrofoam rich body with a semicylindrical rich cover to prevent corrosion and breakage of the styrofoam inside, but there is a problem that a separate rich cover is required to be manufactured and assembled .

On the other hand, Korean Patent Registration No. 10-1065116 discloses a rich for aquaculture in which EVA resin is mixed with NBR. In the case of such a mixture of EVA resin and NBR, there is a great effect in solving the problem of hydrolysis, but it is difficult to recycle, and the product efficiency is low and the application efficiency is low due to economical problems.

In recent years, an eco-friendly material that can be recycled has been used as a bulge formed of expanded polypropylene (EPP), which is widely used as a buffering material in the automobile industry. However, there is a disadvantage in that the foam formed in the foamed polypropylene is inferior to the foamed foam and the resilience in the inner foam molding. Particularly, there is a problem in that the internal formability is remarkably deteriorated at a bore of 100 mm or more.

Korean Registered Patent No. 10-1065116: Rich for aquaculture and manufacturing method thereof

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method for producing a foamed polypropylene which has improved buoyancy and resilience, And a method for producing the same.

Another object of the present invention is to provide a buoy having a skin layer formed by melting to improve the waterproof function and strength on the outer side of the outer member and a method for manufacturing the same.

According to an aspect of the present invention, there is provided a borehole comprising: an inner member formed by a primary foam molding; a secondary foam molding positioned outside the inner member and being formed along a circumference on both sides of the outer periphery in the longitudinal direction, Wherein the inner member includes a core portion positioned on a center side of the outer member, and a plurality of linear members supported on both ends of the core portion facing the longitudinal direction of the outer member A plurality of linear members each extending in a direction away from the core portion at the center side and supported by the linear member support grooves to reinforce the strength against the pressure applied to the outer member when the linear member is tied to the fishing net or the intermediate band, And a reinforcing portion.

The plurality of reinforcing portions extend to both side ends of the outer member, and the outer diameters of the reinforcing portions increase toward the core portion at the respective end portions, so that the pressure applied to the outer member by the linear member, Respectively.

The inner member is formed to have the same length in radial directions extending in the direction intersecting the longitudinal direction of the outer member about the core portion so that the core portion is positioned at the center of the outer member at the time of forming the outer member, And a plurality of core supports.

Each of the end portions of each of the reinforcing portions formed on both sides of the core portion is disposed to extend in parallel to the longitudinal direction of the outer member and each end portion protrudes to both sides of the outer circumferential surface of the outer member, A plurality of linear member binding pieces each formed with a linear member and a binding hole for binding, and a plurality of linear member binding pieces which are accommodated in the inner side of the inner member and connected to linear member binding pieces extending in the longitudinal direction of the outer member and spaced from each other, And a binding member provided with a restraining piece for restraining the piece.

The linear member binding piece is extended by the diameter of the outer member, and the outer member is inserted and formed in the direction of the inner member on both sides corresponding to the linear member binding piece so that both side ends of the linear member binding piece are projected to the outside It is preferable that recessed recessed grooves are formed which have a reduced width as the end portion is drawn back.

Preferably, the core portion is formed with a shock buffer hole penetrating in a direction crossing the longitudinal direction so as to buffer an impact against an external impact.

The inner member may be foamed to have a higher density than the outer member so as to support the outer member against an external impact.

In order to accomplish the above object, the present invention provides a method of manufacturing a mold, comprising the steps of: forming an inner member by molding a foamed polypropylene material into a first upper mold and a first lower mold, Molding an outer member by filling a foamed polypropylene material inward with the second upper mold and the second lower mold which are mutually combined in a state in which the molded inner member is housed; After the molding of the outer member, a pressure of 5 to 6 kg _f / cm < 2 > and a temperature of 108 to 120 < 0 > C for a preset time are applied to the outer circumferential surface of the outer member housed inside in a state where the second upper mold and the second lower mold are combined, To form a molten skin layer.

Since the outer member is formed by secondary foam molding after the inner member primary foaming molding, the inner foam member is improved and the inner member is extended to the position adjacent to the linear member binding the outer member to the fishing net or the intermediate band And the outer shape of the outer member is prevented from being changed or damaged due to the pressure of the linear member, so that the durability can be improved.

Also, since the shock absorbing hole is formed in the inner member of the present invention, the durability can be improved as the buffering force against the external shock is improved.

In addition, the method of manufacturing a bag according to the present invention can form a skin layer capable of improving the waterproof function and strength by a simple process of applying high temperature and high pressure after foam molding of the outer member.

FIG. 1 is a perspective view of a mouth according to a first embodiment of the present invention, FIG.
Fig. 2 is a partial cross-sectional view of the negative electrode of Fig. 1,
Figure 3 is a perspective view of the inner member of Figure 1,
FIG. 4 is a perspective view of a second embodiment of the present invention, FIG.
5 is a perspective view of a third embodiment of the present invention,
FIG. 6 is a partial plan sectional view of a portion of FIG. 5,
FIG. 7 is a partial cross-sectional view of the negative electrode of FIG. 5,
Fig. 8 is a perspective view of the inner member accommodating the linear member binding frame of Fig. 5,
FIG. 9 is a partially cutaway perspective view of a cigarette according to a fourth embodiment of the present invention,
Figure 10 is a perspective view of the inner member of Figure 9,
FIG. 11 is a partially cutaway perspective view of a cigarette according to a fifth embodiment of the present invention,
Figure 12 is a schematic view of the inner member of Figure 11,
FIG. 13 is a partial cross-sectional side view of a cigarette according to a sixth embodiment of the present invention. FIG.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show a subgraph according to a first embodiment of the present invention.

The mouthpiece 1 according to the first embodiment of the present invention comprises an inner member 20 which is formed by primary foam molding and an outer member 10 which is molded on the outer side of the inner member 20 by secondary foam molding.

Since the outer member 10 is formed by filling the foamed polypropylene resin in the state where the inner member 20 is accommodated in the mold (not shown), an inner space corresponding to the inner member 20 is formed.

The outer member 10 is formed into a cylindrical shape and extends in the direction of the inner member 10 on the outer circumferential surface on the side intersecting the longitudinal direction and extended in the circumferential direction to form a mesh net A plurality of linear member support grooves 11 each of which is engaged with and supported by linear members (not shown) to be engaged and spaced from each other in the longitudinal direction of the outer member 10; And extend in the longitudinal direction of the outer member 10 so as to extend in the longitudinal direction of the outer member 10 so as to define the linear member support grooves 11, And a countermeasure slot 13 in which the countermeasures 6 are accommodated, respectively.

The inner member 20 is formed of a foamed polypropylene material such as the outer member 10, and foamed polypropylene having a density higher than that of the outer member 10 can be applied to increase the strength against external impact. As an example, the foamed polypropylene can be manufactured to various particle densities ranging from 20 to 60 g / l depending on the expansion ratio. In the inner member 20, a high-expansion foamed polypropylene having a size of 45 to 70 times or more is applied, 10) may be applied at a low-ratio foamed polypropylene of 5 to 45 times or less.

2 and 3, the inner member 20 includes a core portion 21, a plurality of reinforcing portions 24, and a plurality of core supporting portions 28.

The core portion 21 is located on the center side of the inner space of the outer member 10 and is formed into a cylindrical shape corresponding to the outer member 10. [

The plurality of reinforcing portions 24 extend from the central portions of both ends of the core portion 21 facing the longitudinal direction of the outer member 10 to both side ends of the outer member 10 in the direction away from the core portion 21.

The reinforcing portion 24 reinforces the strength against the pressure applied to the outer member 10 by the linear member supported in the linear member support groove 11 for binding with the fishing net or the intermediate band 6.

The reinforcing portion 24 projects in the shape of a cylinder having a diameter smaller than that of the core portion 21 in a direction away from the core portion 21 at one end or the other end center side of the core portion 21 facing the longitudinal direction of the outer member 10 A reinforcing main body portion 26 connected to an end of the outer diameter reducing portion 25 and having a constant outer diameter, a reinforcing main body portion 26 connected to the core portion 21 and having a reduced outer diameter, And a restricting portion 27 connected to an end of the core portion 21 and having an outer diameter expanded toward the core portion 21.

The restricting portion 27 is formed so as to have an outer diameter gradually increasing toward the outer side so that the linear member is seated in the linear member support groove 11 of the outer member to support the outer member against the pressure applied to the end portion of the outer member.

2, the reinforcing portion 24 has a diameter that is symmetrical to the outer diameter of the restricting portion 27 about the reinforcing main portion 26, and the outer diameter of the restricting portion 27 and the outer diameter The restraining force of the outer shaft member 10 between the narrowed portions 25 is strengthened.

The plurality of core supporting portions 28 support the core portion 21 so that the core portion 21 is positioned at the center of the outer member 10 when the outer member 10 is molded with the inner member 20 received in the mold The outer circumferential surface of the outer circumferential surface of the core member 21 on the outer circumferential surface of the core member 21 on the side intersecting the longitudinal direction of the outer member 10 has the same length in the radial direction Each extending in a cylindrical shape and spaced at equal intervals in the circumferential direction, and each end is exposed to the outside.

Referring to FIG. 3, the plurality of core supports 28 are formed in an even number so as to be symmetrically opposed to each other with respect to the core portion 21.

The core supporting portion 28 is formed in a cylindrical shape having a smaller diameter from one side adjacent to the core portion 21 to the other side toward the outside and the other end surface exposed to the outside corresponds to an arcuate curvature of the outer peripheral surface of the outer member And is formed into a curved surface.

Although not shown in the drawings, the outer member 10 may be further provided with a shell layer (not shown) having a higher density and strength than the outer member 10. The outer cover layer may be formed by applying a synthetic resin to the outer circumferential surface of the outer member 10 as a whole or by covering the outer member 10 with another divided cover member (not shown) injection molded by a synthetic resin.

Although not shown in the drawings, the shock absorber (not shown) may be formed through the core portion 21 or the reinforcing portion 24 to buffer external shocks have.

In the first embodiment of the present invention having the above-described structure, it is desirable to apply the present invention to a farm where the short answer v. Support groove 13 is formed.

The mouthpiece 1 according to the first embodiment of the present invention is formed by secondary foam molding of the outer member 20 after the inner member 20 is subjected to the primary foam molding so that the inner foam formation can be improved.

The mouthpiece 1 according to the first embodiment of the present invention is formed so that the inner member 20 is extended to a position corresponding to the linear member which binds the outer member 10 with the counter bushing 6, The outer shape of the outer member against pressure is prevented from being changed and broken, thereby improving durability. Especially. A plurality of restricting portions 27 of the first embodiment of the present invention support both sides of the outer member 10 to which a force for pushing outwardly is applied while the linear members are bound to the linear member support grooves 11 The durability of the outer member 10 is further improved.

4 shows a second embodiment according to the present invention. Components having the same functions as those in the drawings shown above are denoted by the same reference numerals.

The second embodiment of the present invention can also be applied to oysters, seaweeds, and cage forms in addition to the Kim style. In the structure of the cigarette 1 according to the first embodiment of the present invention, 11 are not partitioned and are not formed in the circumferential direction so as to communicate with each other. In the second embodiment according to the second embodiment of the present invention, the inner member 20 and the outer member 10 are elongated in the longitudinal direction than the first embodiment of the present invention.

5 to 8 illustrate a third embodiment of the present invention.

The mouthpiece 3 according to the third embodiment of the present invention comprises an inner member 120 formed by primary foam molding, an outer member 110 which is formed by secondary foam molding located outside the inner member 120, And a coupling member 130 protruding from both sides of the outer member and coupled to a linear member (not shown).

Since the outer member 110 is formed by filling the foamed polypropylene resin in the state that the inner member 120 including the binding member 130 is accommodated in the mold (not shown), the inner member 120 120 are formed.

The outer member 110 is formed in a cylindrical shape and extends in the direction of the inner member 120 on the outer circumferential surface on the side intersecting with the longitudinal direction and extends in the circumferential direction to form a linear member (not shown) A plurality of linear member support grooves 111 which are respectively seated and supported and spaced from each other in the longitudinal direction of the outer member 110 and a plurality of linear member support grooves 111 which are mutually opposed to one side and the other side in the circumferential direction on the outer peripheral surface between the linear member support grooves 111 And a plurality of inlet grooves 113 spaced in the longitudinal direction of the outer member 110 are formed.

The inlet groove 113 of the outer member 110 is formed in a direction of the inner member 120 and has a concave shape whose width decreases toward the drawn end and is connected to the linear member coupling piece 131 of the coupling member 130 And the end portion protrudes to the outside.

6 to 8, the inner member 120 is formed of a foamed polypropylene material having a density higher than that of the outer member 110 and includes a core portion 121, a plurality of reinforcing portions 124, And a core support portion 128.

The core portion 121 is formed in the shape of a cylinder located on the center side of the inner space of the outer member 110 and extending in a direction parallel to the outer member 110.

The plurality of reinforcing portions 124 extend in a cylindrical shape in a direction away from the core portion 121 at both ends of the core portion 121 extending in the longitudinal direction of the outer member 10, To increase it, the outside diameter changes from one side to the other side.

The reinforcing portion 124 projects in a cylindrical shape in a direction away from the core portion 121 at one end or the other end of the core portion 121 that faces the longitudinal direction of the outer member 110 and has an outer diameter A reinforcing body portion 125 having an arc-shaped curved surface to which the center side is drawn down and an outer diameter reducing portion 126 having an outer diameter decreasing toward the outer side from the end portion of the reinforcing body portion 125.

On the center side where the outer diameter of the reinforcing main body portion 125 is reduced, a binding member 130, which will be described later, is inserted through in a direction orthogonal to the longitudinal direction and protruded to both sides.

6 and 7, the reinforcing portion 124 is formed to be shorter than the length from the end of the core portion 121 to the linear member support groove 111 in the longitudinal direction of the outer member, 111).

The reinforcing portion 124 extends to a position adjacent to the linear member supporting groove 111 and is connected to a binding member 130 to be described later for connection with a fishing net or a linear member which is supported by the linear member supporting groove 11, The strength against the pressure applied to the outer member 10 is reinforced.

A plurality of core supporting portions 128 are formed on the outer surface of the core member 121 so that the core member 121 is positioned at the center of the outer member 110 when the inner member 120 is accommodated in the mold, Extending radially the same length in a direction intersecting the longitudinal direction of the outer member 110 with respect to the core portion 121 and being spaced equidistantly in the circumferential direction and each end is exposed to the outside .

Referring to FIG. 6, it is preferable that the plurality of core supports 128 are formed in an even number, and are positioned symmetrically opposite to each other with respect to the core 121.

6 and 8, the binding member 130 is provided on the center side where the outer diameter of the reinforcing main body portion 124 of each reinforcing portion 124 is reduced in the direction orthogonal to the longitudinal direction of the outer member 110 A plurality of linear member coupling pieces 131 extending in parallel to each other and extending in the longitudinal direction of the outer member 110 and accommodated in the inner side of the inner member 120 and connecting mutually spaced linear member coupling pieces 131 And a restraining piece 133 is provided.

The binding member 130 is connected to the linear member and is preferably formed of a synthetic resin material having higher strength than the outer member 10 and the inner member 20 so as to withstand the tensile force of the linear member. May be applied.

6, the linear member coupling piece 131 extends through the reinforcing portion 124 and extends in the direction of the insertion groove 113 of the outer member 110. The linear member coupling piece 131 includes a core portion 121, That is, the diameter of the outer member 110, and protrudes into the inlet groove 113 of the outer member 110. The outer diameter of the core member supporting portion 128 is larger than that of the outer member 110,

The linear member binding piece 131 is formed with binding members 132 for binding with the linear member at both side ends protruding from the respective lead-in grooves 113.

The mouthpiece 3 according to the third embodiment of the present invention having the above-described structure is easy to apply to shellfish farms such as oysters, and has a binding member which is connected to an adjacent port, (130) is provided to penetrate the inside of the outer member (110) and the inner member (120), so that the stress on the tensile force of the linear member can be improved.

In the third embodiment of the present invention, the inner member 120 has a diameter different from that of the inner member 120 in the longitudinal direction so that the coupling with the outer member is reinforced, and the reinforcing portion 124 is inserted into the linear member support groove 111, The strength of the outer member 110 due to a pressure or an external impact due to the linear member that surrounds the outer member 110 in the circumferential direction is improved, thereby increasing durability.

9 and 10 illustrate a mouth 4 according to a fourth embodiment of the present invention.

The mouthpiece 4 according to the fourth embodiment of the present invention comprises an inner member 220 formed of the same material as the outer member 10 and the inner member 20 of the mouthpiece according to the first embodiment of the present invention, (210).

The outer member 210 is formed by filling foamed polypropylene resin in a state where the inner member 220 is accommodated in a mold (not shown), so that an inner space corresponding to the inner member 220 is formed.

The outer member 210 is formed in a cylindrical shape, and a plurality of linear member support grooves 211 are formed on the outer peripheral surface of the outer member 210 in the longitudinal direction.

10, the inner member 220 is located at the center of the inner space and includes a cylindrical core portion 221 and an outer member 210 in a direction away from the core portion 221 at both ends of the core portion 221, A plurality of reinforcing portions 224 extending to both side ends of the core supporting portion 228, and a plurality of core supporting portions 228.

The reinforcing portion 224 projects in a cylindrical shape in a direction away from the core portion 21 at one end or the other end of the core portion 21 facing the longitudinal direction of the outer member 210. The reinforcing portion 224 is connected to the core portion 21, A reinforcing main body portion 226 connected to an end of the outer diameter reducing portion 225 and having a constant outer diameter and a core portion 221 connected to an end portion of the reinforcing main portion 226, A restricting portion 227 extending in the outer diameter of the outer member 210 in the longitudinal direction of the outer member 210 so as to extend from the center of the end portion of the restricting portion 227 to the inner member 220 for determining the position of the auxiliary support portion 231.

A plurality of core supporting portions 228 are formed on the outer peripheral surface of the core portion 21 on the side intersecting the longitudinal direction of the outer member 10 in the direction crossing the longitudinal direction of the outer member 10 about the core portion 21 Each of which is formed in a cylindrical shape in a side by side manner and is exposed to the outside, and the outer diameter is slightly reduced toward the end portion.

The plurality of core supporting portions 228 are spaced apart from each other in the longitudinal direction on the outer peripheral surface of the core portion 221 so as to be mutually symmetrical with respect to the longitudinal center side of the core portion 221, And are formed at positions mutually symmetrical with respect to the respective center sides in the transverse direction of the core portions 221, which are equally spaced in the circumferential direction.

The core part 221 is formed to penetrate through the core supporting part 228 in the longitudinal direction between the core supporting parts 228 spaced apart from each other in the longitudinal direction and to penetrate the core supporting part 228 in the longitudinal direction of the outer member 210, A hole 222 is formed.

The plurality of reinforcing portions 224 are formed in the reinforcing main body portion 226 at positions corresponding to the first impact buffering bores 222, (229) are formed.

The first and second shock absorbers 222 and 229 are formed on the inner member 220 so that the outer member 210 And the buffer force against the external impact can be increased.

On the other hand, Fig. 11 and Fig. 12 show the subsection 5 according to the fifth embodiment of the present invention.

In the fifth embodiment of the present invention, the structure corresponding to the auxiliary support is not formed in the structure of the fourth embodiment of the fourth embodiment of the present invention, and the position of the first shock buffer is different.

The fifth embodiment according to the fifth embodiment of the present invention is suitable for the manufacture of a 200 L bulb. The linear member supporting groove 311 is formed on the outer circumferential surface along the circumferential direction to support the linear member, and the outer member 310 And an inner member 320 accommodated in the outer member 310.

The inner member 320 is disposed on the center side of the inner space of the outer space according to the fourth embodiment of the present invention and has a cylindrical core portion 321 and a cylindrical core portion 321 extending in a direction away from the core portion 221 at both ends of the core portion 321 A plurality of reinforcing portions 324 extending in a cylindrical shape and a plurality of core supporting portions 328 for supporting the core portion 321 when the outer member is molded.

The reinforcing portion 324 protrudes in a direction away from the core portion 321 at one end or the other end of the core portion 321 facing the longitudinal direction of the outer member 310. The reinforcing portion 324 is connected to the core portion 321, A reinforcing body portion 326 connected to the end of the outer diameter reducing portion 325 and having a constant outer diameter and a reinforcing body portion 326 connected to the end portion of the reinforcing body portion 326 and spaced apart from the core portion 321 And a restricting portion 327 whose outer diameter increases.

The reinforcing portion 324 is formed to penetrate the core support portion 328 in the direction of extending the core support portion 328 at a position spaced from each other in the circumferential direction with one core support portion 328 of the core support portions 328 adjacent to each other in the circumferential direction interposed therebetween. And a plurality of shock absorbers 322 in the form of elongated holes each extending in the longitudinal direction of the outer member 310 are formed.

Referring to FIG. 12, a plurality of shock buffer holes 322 are formed in the circumferential right and left sides of each of the core supporting portions 328, which are equally spaced apart in the longitudinal direction of the outer member 310, . The impact buffer hole 322 formed in the shape of a slot extends from the core portion 321 to the reinforcing main body portion 326 of the reinforcing portion 324.

The cigarette 5 according to the fifth embodiment of the present invention is suitable for a large-sized cigarette having a volume of about 200L or more. The inner member 320 is provided with a shock buffering hole 329 so that the strength of the outer member 320 So that the buffering force against the external impact can be increased.

13 shows a mouth 6 according to a sixth embodiment of the present invention. Components having the same functions as those in the drawings shown above are denoted by the same reference numerals.

The mouthpiece 6 according to the sixth embodiment of the present invention further comprises a skin layer 18 melted and formed in the structure of the mouthpiece 1 according to the first embodiment of the present invention.

The outer skin layer 18 is formed by the high temperature and high pressure applied to the outer peripheral surface of the outer member 10 and the end of the core supporting portion 28 of the inner member 20 for a certain period of time after the outer member 10 is foam- And the end portion of the core supporting portion 28 of the inner member 20 are melted and fused to each other.

 The mouthpiece 6 according to the sixth embodiment of the present invention is constructed such that the outer peripheral surface of the outer member 10 and the end portion of the core support portion 28 of the inner member 20 are melted to be integrally formed with the skin layer 18, And the strength is improved.

In the meantime, as in the first embodiment of the present invention, a foamed polypropylene having a density higher than that of the outer member is preferably applied to the plug 6 according to the sixth embodiment of the present invention.

In the sixth embodiment of the present invention, since the skin layer 18 is formed, the foamed polypropylene material having the density of the outer member 10 higher than that of the inner member 20 may be applied. As an example, the outer member 10 may employ a high magnification foamed polypropylene material of 45 to 70 times or more, and the inner member 20 may employ a low magnification foamed polypropylene material of 5 to 45 times or less.

The method for manufacturing the plug 6 according to the sixth embodiment of the present invention includes an inner member foaming molding step, an outer member foaming molding step, and a skin layer forming step.

The inner member foam molding step is a step of molding the inner member 20 by filling foamed polypropylene in a first upper mold (not shown) and a first lower mold (not shown) which are mutually combined.

The first upper mold and the first lower mold are mutually combined to form a first molding space corresponding to the inner member 20 on the inner side.

 The outer member foaming step includes filling a foamed polypropylene material into a second upper mold (not shown) and a second lower mold (not shown) which are mutually combined in a state where the molded inner member 20 is accommodated, )

The second upper mold and the second lower mold are mutually formed so that first and second grooves (not shown) are formed in a direction away from each other so that a second molding space corresponding to the outer member can be formed therein have. After the inner member 20 is housed in the second lower mold, the second upper mold is lowered or the second lower mold is lifted to mold the second upper mold and the second lower mold, and the foamed polypropylene The outer member 10 is formed by filling the material.

In the foam forming method of the inner member foaming step and the outer member foaming step, a general molding method may be employed in which carbon gas is injected into the foamed material filled in the first forming space or the second forming space, have.

The skin layer forming step is a step of forming the skin layer 18 on the outer circumferential surface of the outer member 10 after the outer member 10 is formed. Specifically, in the skin layer forming step, in order to form the skin layer 18, the outer member 10 foam-molded outwardly of the inner member 10 is inserted into the second upper mold and the second lower mold, The outer peripheral surface of the outer member 10 and the outer peripheral surface of the core supporting portion 28 of the inner member 20 are heated by applying a temperature of 108 to 120 占 폚 to the outer peripheral surface side of the member 10 for 3 to 5 seconds at a pressure of 5 to 6 kg _f / And melting the end portion to form the skin layer 18.

By way of example, to the 110 ℃ steam at a pressure in the skin layer forming step for 4 seconds 5kg _f / ㎠ supplied to the outer peripheral surface side of the outer member 10, the end portion of the outer surface and the core support 28 of the outer member (10) And the skin layer 18 can be formed by melting. If the steam pressure exceeds 6 kgf / cm 2, the surface shrinkage is too severe to smooth the surface. If the steam pressure is less than 5 kgf / cm 2, it takes a long time to melt the surface, which is disadvantageous in energy waste. The steam supply time for forming the skin layer 18 is preferably set to the shortest time in consideration of the steam pressure and the surface shrinkage

The method of manufacturing a bag according to the present invention can form a skin layer capable of improving waterproof function and strength by a simple process of applying high temperature and high pressure after foaming molding of the outer member (10).

Since the outer member according to the present invention is formed by secondary foam molding of the inner member after the primary foam molding, the inner foam formation is improved and the inner member is positioned at a position adjacent to the linear member So that the outer shape of the outer member is prevented from being changed and damaged due to the pressure of the linear member, thereby improving durability.

In addition, the present invention is advantageous in that durability can be improved since a shock buffer is formed in the inner member to improve the buffering force against an external impact.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1, 2, 3: Bugu 6:
10,110,210: outer member 11,111,211: linear member supporting groove
13: Intermediate stand accommodating groove 20,120,220: Inner member
21: core part 24,124,224: reinforcement part
25: outer diameter reduction part 26,125,226: reinforcement body part
27: restricting portion 28, 128, 228:
113: inlet groove 130: binding member
131: Linear member binding piece 132: Bonding hole
133:

Claims (9)

A primary foam molded inner member,
And an outer member formed by secondary foam molding located outside the inner member and formed with a circumferential groove on both sides of the outer circumferential surface in the longitudinal direction and having a linear member supporting groove supported by the aquarium or the intermediate bar,
The inner member
The linear member extending in a direction away from the core portion at the center of both ends of the core portion facing the longitudinal direction of the outer member and being supported by the linear member support groove A plurality of reinforcement parts for reinforcing the strength against the pressure exerted on the outer member at the time of binding with the style network or the intermediate band, And a plurality of core supports extending radially in the same direction and spaced apart from one another in a direction intersecting the longitudinal direction of the outer member,
The core portion
And a shock absorbing hole formed in a direction crossing the longitudinal direction so as to buffer an impact against an external shock. 2. The apparatus of claim 1, wherein the plurality of reinforcement portions
The outer diameter of each of the outer members is extended to both side ends of the outer member, and the outer diameters of the outer members are increased as they are further away from the core, Each of which is provided with an opening. delete A primary foam molded inner member,
And an outer member formed by secondary foam molding located outside the inner member and formed with a circumferential groove on both sides of the outer circumferential surface in the longitudinal direction and having a linear member supporting groove supported by the aquarium or the intermediate bar,
The inner member
The linear member extending in a direction away from the core portion at the center of both ends of the core portion facing the longitudinal direction of the outer member and being supported by the linear member support groove And a plurality of reinforcing portions for reinforcing the strength against the pressure exerted on the outer member at the time of binding with the style network or the intermediate band,
The reinforcing portions formed on both sides of the core portion in parallel with each other in the direction crossing the longitudinal direction of the outer member, the both ends of the reinforcing portion projecting to both sides of the outer periphery of the outer member, And a plurality of linear member binding pieces each of which is accommodated in the inside of the inner member and extended in the longitudinal direction of the outer member to be spaced apart from each other to be bound with the linear member binding piece And a binding member which is provided with a binding member. The linear member binding member according to claim 4, wherein the linear member binding piece
The outer member is formed to extend by the diameter of the outer member,
The outer member
And both end portions of the linear member coupling piece are protruded to the outside, and both sides corresponding to the linear member binding piece are formed with recessed recessed grooves which are drawn in the direction of the inner member and reduced in width toward the drawn end portion The delete 2. The apparatus of claim 1, wherein the inner member
Wherein the outer member is foam-molded to have a higher density than the outer member so as to support the outer member against an external impact. The apparatus of claim 1, wherein the outer member
Characterized in that a molten skin layer is formed by applying a pressure of 5 to 6 kg _f / cm 2 and a temperature of 108 to 120 캜 to the outer circumferential surface after foam molding. An inner member foam molding step of forming an inner member by filling a foamed polypropylene material in the first upper mold and the first lower mold which are mutually combined;
Molding an outer member by filling a foamed polypropylene material inward with the second upper mold and the second lower mold which are mutually combined in a state in which the molded inner member is housed;
After the molding of the outer member, a pressure of 5 to 6 kg _f / cm < 2 > and a temperature of 108 to 120 < 0 > C for a preset time are applied to the outer circumferential surface of the outer member housed inside in a state where the second upper mold and the second lower mold are combined, And a skin layer forming step of forming a molten skin layer,
The inner member
A linear member extending in a direction away from the core portion at a center of both ends of the core portion facing the longitudinal direction of the outer member and being supported by the linear member support groove, A plurality of reinforcing portions for reinforcing the strength against the pressure applied to the outer member when the outer member is coupled with the outer member, And a plurality of core supporting portions extending in a radial direction and extending in the same direction,
The core portion
Wherein the shock absorbing hole is formed so as to penetrate in a direction crossing the longitudinal direction so as to buffer an impact against an external impact.

Images