KR101764739B1 - Mold apparatus for making rotary opening-closing type case and rotary opening-closing type case - Google Patents

Mold apparatus for making rotary opening-closing type case and rotary opening-closing type case Download PDF

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Publication number
KR101764739B1
KR101764739B1 KR1020150139726A KR20150139726A KR101764739B1 KR 101764739 B1 KR101764739 B1 KR 101764739B1 KR 1020150139726 A KR1020150139726 A KR 1020150139726A KR 20150139726 A KR20150139726 A KR 20150139726A KR 101764739 B1 KR101764739 B1 KR 101764739B1
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South Korea
Prior art keywords
molding
mold
groove
supporting
pressing portion
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KR1020150139726A
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Korean (ko)
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KR20170040578A (en
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문시현
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문시현
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0446—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by increasing the density locally by compressing part of the foam while still in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold apparatus and a rotary opening / closing type case for manufacturing a rotary opening and closing type case, and more particularly, to a mold apparatus and a rotary opening and closing type case for manufacturing a rotary opening and closing type case of a foamed polypropylene material in solid granular form.
The foamed polypropylene is compressed and formed in the hinge portion constituting the rotating and opening type case to maximize the mechanical strength of the hinge portion so that the case can be easily opened and closed while being easily torn.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold apparatus and a rotary opening / closing type case for manufacturing a turn-open type case of a foamed polypropylene material,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold apparatus and a rotary opening / closing type case for manufacturing a rotary opening and closing type case, and more particularly, to a mold apparatus and a rotary opening and closing type case for manufacturing a rotary opening and closing type case of a foamed polypropylene material in solid granular form.

BACKGROUND ART [0002] Generally, a packaged case for storing articles has a case body, which is provided with a storage space therein, in such a manner that a lid is openably and closably connected to the case, and upper and lower cases each having a storage space therein are hinged to each other, .

On the other hand, in the case of a conventional packaging case, when there is a possibility that a product stored in the inside of the packaging case may be damaged due to a flow occurring inside the case due to an impact applied during transportation or the like, There has been known a packaging case having a structure in which filling material of light and stretchable material such as styrofoam or sponge is formed in a shape conforming to the shape of the outer circumferential surface of the storage article to thereby fill the space between the storage article and the inner circumferential surface of the package case.

However, in the case of the packaging case having a structure for preventing the flow of the stored article by using the filling material, in most cases, when the packaging case and the filling material itself are used once as a disposable article, a large amount of waste is generated, It is a fact that is pointed out.

In the case of the styrofoam case, since the mechanical strength and the heat resistance are low, the shape of the case is easily changed and the possibility of breakage is high.

In addition, when the case is manufactured using Styrofoam, it is difficult to manufacture the hinge portion, and even if the hinge portion is manufactured, the mechanical strength is low and the hinge portion is easily torn.

Recently, a technique for producing a case using polypropylene which can be recycled and has excellent mechanical strength is shown.

Since all of the techniques for producing a case using polypropylene as described above use polypropylene in a liquid state, there is almost no buffering effect on the fabricated case and the weight becomes heavy. Due to the properties of the liquid synthetic resin material, There is a disadvantage that distortion occurs.

Korean Patent Publication No. 10-2001-0083383

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and it is an object of the present invention to provide a mold apparatus and a turn-key opening type case capable of manufacturing a case having a small mechanical strength and heat resistance, have.

In order to accomplish the above object, the present invention provides a mold apparatus for manufacturing a spin-openable case of a foamed polypropylene material, comprising: a first mold having a molding groove formed on one surface thereof; a second mold having a molding protrusion inserted into the molding groove on one surface thereof; A mold apparatus comprising a mold and injecting foamed polypropylene in the form of a solid granule between the first mold and the second mold to produce a rotary opening and closing type case, Wherein the first molding groove and the second molding groove are formed with a support step protruding higher than a bottom surface of the molding groove and the molding protrusion is inserted into the first molding groove and the second molding groove, 1 forming protrusion and a second molding protrusion inserted into the second molding groove, and a pressing portion is formed between the first molding protrusion and the second molding protrusion, Wherein a distance between the pressing portion and the supporting jaw is smaller than a minimum distance between the molding groove and the molding projection in a state where the first mold and the second mold are coupled to each other, The foamed polypropylene is compressed to the maximum to form the hinge portion of the case.

Wherein a distance between the pressing portion and the supporting jaw is smaller than a diameter of the foamed polypropylene solid particles in a state where the first mold and the second mold are in tight contact with each other, And the foamed polypropylene solid grains disposed between the molding die and the support jaws are more compressed and maximally compressed than those between the molding groove and the molding projection.

The support jaw is formed with a support groove recessed in the direction opposite to the direction of the presser portion, and the presser portion is formed with a press protrusion inserted into the support groove.

The width of the pressing portion is formed to be larger than the width of the supporting jaw.

And the pressing portion is slidably engaged with the supporting jaw in the second mold.

And a driving member for moving the pressing portion in the direction of the supporting jaw.

Wherein the driving member retracts the pressing portion when the foamed polypropylene solid particles are filled between the first mold and the second mold, and when the first mold and the second mold are closely coupled to each other, And the foamed polypropylene solid particles disposed therebetween are pressed to form the hinge portion of high compression.
The hinge portion includes a first support portion which is compressed between the pressing portion and the first molding groove by movement of the pressing portion and is formed on the upper cover and a second support portion which is formed between the pressing portion and the second molding groove by movement of the pressing portion, And a bent portion formed between the first supporting portion and the second supporting portion and formed by the pressing protrusion and the supporting groove, wherein the first supporting portion and the second supporting portion are formed of a metal plate, And the first supporting portion, the second supporting portion, and the bent portion are more compressed than the other portions of the case by forward movement of the pressing portion by the driving member, do.

In addition, the rotation openable type case of the foamed polypropylene material of the present invention comprises: an upper cover; A lower cover; Wherein the upper cover, the lower cover, and the hinge portion are integrally joined to each other by fusion-bonded foamed polypropylene in the form of solid granules, wherein the upper cover, the lower cover, And the hinge portion is formed by further compressing the foamed polypropylene than the upper cover and the lower cover.

According to the mold apparatus and the openable and closable case for manufacturing the openable and closable case of the foamed polypropylene material of the present invention as described above, the following effects can be obtained.

Since the case is manufactured using foamed polypropylene, the mechanical strength and the heat resistance are excellent, so there is less fear of breakage, and a lightweight but excellent buffering effect can be obtained.

Particularly, by forming the hinge portion of the case with the foamed polypropylene made of solid granules with high compression, it is possible to increase the mechanical strength of the hinge portion and to prevent the hinge portion from being easily torn or broken even in frequent rotation during opening and closing of the case.

In addition, since the case is made of foamed polypropylene, the impact resistance and the heat resistance according to the buffering effect are improved, and the recyclability is also excellent.

1 is a cross-sectional structural view of a mold apparatus according to an embodiment of the present invention;
2 is a perspective view of a first mold according to an embodiment of the present invention,
3 is a perspective view of a second mold according to an embodiment of the present invention,
4 and 5 are views illustrating a process of manufacturing a case using a mold apparatus according to an embodiment of the present invention.
FIG. 6 is a perspective view of a turnable and openable case manufactured by a mold apparatus according to an embodiment of the present invention; FIG.

1 to 5, the mold apparatus for manufacturing the spin-openable case of the foamed polypropylene material of the present invention comprises a first mold 10 and a second mold 20.

The first mold 10 has a molding groove 11 formed on one surface thereof.

The second mold 20 has a molding protrusion 21 inserted into the molding groove 11 on one side thereof.

The first mold 10 and the second mold 20 may be arranged vertically or horizontally.

A foamed polypropylene 50 in the form of a solid granule is injected between the first mold 10 and the second mold 20 to produce a turnable and openable case 40.

The molding groove 11 includes a first molding groove 12 and a second molding groove 13 which are mutually communicated in a horizontal direction as shown in FIG.

A supporting step 14 is protruded between the first forming groove 12 and the second forming groove 13.

The support step 14 is formed to protrude higher than the bottom surface of the molding groove 11.

1 and 3, the forming protrusion 21 comprises a first forming protrusion 22 and a second forming protrusion 23. As shown in FIG.

The first shaping protrusion 22 is inserted into the first shaping recess 12 and the second shaping protrusion 23 is inserted into the second shaping recess 13 .

A pressing portion 24 is formed between the first shaping protrusion 22 and the second shaping protrusion 23.

When the first mold 10 and the second mold 20 are engaged, the support step 14 and the pressing part 24 are disposed to face each other.

The support jaw 14 and the pressing portion 24 form the hinge portion 44 of the case 40 manufactured by the first and second molds 10 and 20.

6, the first molding groove 12 and the first molding protrusion 22 form the upper cover 41 of the case 40, 2 forming groove 13 and the second shaping protrusion 23 form the lower cover 42 of the case 40 and the supporting jaw 14 and the pressing portion 24 form the lower portion of the case 40 The hinge portion 44 connecting the cover 42 and the upper cover 41 is formed.

1, the gap between the pressing portion 24 and the supporting jaw 14 in a state where the first and second molds 10 and 20 are coupled to each other is formed in the molding groove 11 Is smaller than the minimum gap between the molding protrusions (21).

The foamed polypropylene 50 injected between the first mold 10 and the second mold 20 is compressed to a maximum extent at a position where the pressing portion 24 and the supporting jaw 14 are located, The hinge portions 44 of the first and second hinge portions 40 and 40 are formed.

5 (b), the gap between the pressing portion 24 and the supporting jaw 14 in the state in which the first and second molds 10 and 20 are in tight contact with each other, Make it smaller than the diameter of the polypropylene (50) solid grains.

Therefore, when the first mold 10 and the second mold 20 are engaged, the foamed polypropylene 50 solid particles disposed between the pressing portion 24 and the support jaw 14 are pressed against the molding groove 11, And the molding protrusion 21, as shown in Fig.

A support groove 15 is formed in the support protrusion 14 so as to be recessed in a direction opposite to the direction of the pushing portion 24. The pushing portion 24 is provided with a pushing protrusion (Not shown).

The support groove 15 and the press protrusion 25 form a groove that can be easily rotated on the hinge portion 44 of the case 40.

The width of the pressing portion 24 is larger than the width of the supporting jaw 14.
More specifically, the width of the pressing portion 24 disposed inside the forming groove 11 and facing the supporting protrusion 14 is formed to be larger than the width of the supporting protrusion 14, and the pressing protrusion 25 Is formed so as to protrude from the center of the pressing portion (24) and to have a width smaller than the width of the supporting jaw (14).

Therefore, the pressing portion 24 can compress the foamed polypropylene 50 around the supporting jaw 14 to make the hinge portion 44 of the case 40 stronger.

The pressing portion 24 may be slidably coupled from the second mold 20 in the direction of the support jaw 14.

In this case, the driving member 30 is engaged with the pressing portion 24 to move the pressing portion 24 in the direction of the supporting jaw 14.

The driving member 30 is made of a cylinder or the like and slides the pressing portion 24 in the direction of the supporting jaw 14.

The pressing portion 24 moves in the direction of the supporting jaw 14 by the driving member 30 and the solid polypropylene foam 50 existing between the pressing portion 24 and the supporting jaw 14 Thereby forming the hinge portion 44 of a high compression ratio.

A method of manufacturing the turn-on and turn-off type case 40 using the above-described manufacturing mold of the present invention is as follows.

The first mold 10 and the second mold 20 are slightly opened as shown in FIG. 4 (a).

At this time, the pressing portion 24 is retracted by the driving member 30.

Therefore, the distance between the pressing portion 24 and the supporting jaw 14 becomes larger than the diameter of the solid foamed polypropylene 50.

In this state, as shown in FIG. 4 (b), the foamed polypropylene 50 solid particles are injected through a separate passage in the space between the molding groove 11 and the molding protrusion 21.

The injected foamed polypropylene 50 solid particles are not only held between the molding groove 11 and the molding protrusion 21 but also between the pressing portion 24 and the supporting jaws 24 which are spaced apart by the retraction of the pressing portion 24 14).

When the injection of the foamed polypropylene 50 is completed, the first mold 10 and the second mold 20 are moved in close contact with each other as shown in FIG. 5 (a).

At this time, high-temperature steam or the like is supplied to the foamed polypropylene 50 existing between the molding groove 11 and the molding protrusion 21 so that the foamed polypropylene 50 in the form of solid granules is slightly melted .

For this purpose, a steam hole (not shown) for spraying steam is formed on the first mold 10 and the second mold 20.

The foamed polypropylene 50 is slightly melted by the high temperature steam and the first mold 10 and the second mold 20 are brought into close contact with each other to be present between the molding groove 11 and the molding protrusion 21 The foamed polypropylene 50 is compressed and mutually bonded.

Thereafter, as shown in Fig. 5 (b), the pressing portion 24 is advanced in the direction of the supporting jaw 14 by using the driving member 30.

Then, the foamed polypropylene 50 existing between the pressing portion 24 and the supporting jaw 14 is further compressed.

Particularly when the first mold 10 and the second mold 20 are in tight contact with each other, the distance between the pressing portion 24 and the supporting step 14 is smaller than the diameter of the solid particles of the foamed polypropylene 50 The foamed polypropylene 50 disposed between the pressing portion 24 and the supporting jaw 14 is pressed to be higher in compression than the other portions and the hinged portion 44 of the case 40 is formed into a high density structure Respectively.

Further, since the pressing portion 24 is advanced after retreating, it is possible to compress the foamed polypropylene 50 in a state in which more foamed polypropylene 50 is disposed therebetween.
More specifically, the hinge portion 44 of the high compression axis is formed by advancing the pressing portion 24. The hinge portion 44 includes a first support portion 44a and a second support portion 44b as shown in FIG. 5, And a support portion 44b and a bent portion 44c.
The first support portion 44a is compressed between the pressing portion 24 and the first molding groove 12 by the movement of the pressing portion 24 and is pressed against the upper cover 41 constituting the case 40 .
The second support portion 44b is compressed between the pressing portion 24 and the second molding groove 13 by the movement of the pressing portion 24 and is pressed against the lower cover 42 constituting the case 40 .
The bent portion 44c is disposed between the first supporting portion 44a and the second supporting portion 44b and is formed in a state of being bent by the pressing projection 25 and the supporting groove 15. [
At this time, since the width of the pressing portion 24 is larger than the width of the supporting jaw 14, the first supporting portion 44a and the second supporting portion 44b can be formed.
The first support portion 44a and the second support portion 44b are disposed to face each other while rotating about the bent portion 44c when the case 40 is closed.
The first support portion 44a, the second support portion 44b and the bent portion 44c are moved forward and backward from the other portions of the case 40 by the advancement of the pressing portion 24 by the driving member 30 And is further compressed to be molded at a high density.

Therefore, the hinge portion 44, which is required to repeatedly rotate in the case 40, is formed in a state of being thin and thick, so that even when the hinge portion 44 is frequently rotated, the hinge portion 44 Can be prevented from being easily broken.

The hinge portion 44 can be rotated more easily by forming a bent groove in the hinge portion 44 by the pressing protrusion 25 inserted into the support groove 15.

6, the rotation-openable case 40 manufactured by the above-described manufacturing mold has an upper cover 41, a lower cover 42, one end of the upper cover 41, And a hinge portion 44 for coupling one end of the hinge portion 42 to the hinge portion 44 so as to be rotatable.

As described above, the upper cover 41, the lower cover 42, and the hinge portion 44 are integrally joined to each other by fusion-bonded foamed polypropylene 50 in the form of solid granules. The hinge portion 44, The foamed polypropylene 50 is further compressed than the upper cover 41 and the lower cover 42, so that a high-density and high-strength rotating portion can be formed.
Particularly, the bent portion 44c corresponding to the hinge point in the hinge portion 44 is not directly connected to the upper cover 41 and the lower cover 42, and the upper cover 41 and the lower cover 42 The bending portion 44c is easily broken or the upper cover 41 and the lower cover 42 are connected to the first and second supporting portions 44a and 44b which are more compressed than the first and second supporting portions 44a and 42b. Peeling can be minimized.

delete

The mold apparatus and the rotary opening / closing type case for manufacturing the turnable closed case of the foamed polypropylene material of the present invention are not limited to the above-described embodiments, and can be variously modified within the scope of the technical idea of the present invention.

The present invention relates to a mold for molding a mold, and more particularly, to a mold for molding a mold,
A first molding protrusion, a second molding protrusion, a pressing portion, a pressing protrusion,
30: driving member,
The present invention relates to a hinge member for a hinge member and a method of manufacturing the hinge member.

Claims (8)

A first mold having a molding groove formed on one surface thereof and a second mold having a molding protrusion inserted into the molding groove on one surface thereof, wherein a foamed polypropylene in the form of solid particles is injected between the first mold and the second mold A lower cover, and a hinge portion,
Wherein the molding groove comprises a first molding groove and a second molding groove which are mutually communicated in a horizontal direction,
Between the first forming groove and the second forming groove, a supporting step is formed to protrude higher than a bottom surface of the forming groove,
Wherein the molding protrusion comprises a first molding protrusion inserted into the first molding recess to mold the upper cover and a second molding protrusion inserted into the second molding recess to form the lower cover,
A pressing portion slidably coupled to the second mold in the direction of the supporting jaw is formed between the first molding protrusion and the second molding protrusion,
The pressing portion is moved in the direction of the supporting jaw by the driving member,
Wherein the support jaw is provided with a support groove recessed in a direction opposite to the direction of the presser portion, and a press protrusion inserted into the support groove is protruded from the presser portion,
Wherein the driving member retracts the pressing portion when the foamed polypropylene solid particles are filled between the first mold and the second mold, and when the first mold and the second mold are closely contacted with each other, The pressing portion is advanced in the direction of the supporting jaw so that the gap is smaller than the minimum gap between the molding groove and the molding projection, so that the foamed polypropylene solid particles disposed therebetween are further pressed than the molding groove and the molding projection And the hinge portion of the high-
Wherein the width of the pressing portion disposed inside the forming groove and facing the supporting jaw is formed to be larger than the width of the supporting jaw and the pressing projection is protruded from the center of the pressing portion to have a width smaller than the width of the supporting jaw ,
Wherein the hinge portion includes a first support portion which is compressed between the pressing portion and the first molding groove by movement of the pressing portion and is formed on the upper cover and a second support portion which is compressed between the pressing portion and the second molding groove by the movement of the pressing portion, And a bent portion formed between the first supporting portion and the second supporting portion and formed by the pressing projection and the supporting groove,
Wherein the first support portion and the second support portion are disposed to face each other when they are rotated about the bent portion when the case is closed,
Wherein the first supporting portion, the second supporting portion, and the bent portion are further compressed and formed by the advancing of the pressing portion by the driving member than other portions of the case. Device. delete delete delete delete delete delete A turn-open type case of a foamed polypropylene material produced by the mold apparatus of claim 1.
KR1020150139726A 2015-10-05 2015-10-05 Mold apparatus for making rotary opening-closing type case and rotary opening-closing type case KR101764739B1 (en)

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KR1020150139726A KR101764739B1 (en) 2015-10-05 2015-10-05 Mold apparatus for making rotary opening-closing type case and rotary opening-closing type case

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KR101764739B1 true KR101764739B1 (en) 2017-08-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200095108A (en) * 2019-01-31 2020-08-10 주식회사 제이 티 Foam article molding apparatus and manufacturing method of foam article using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012061718A (en) 2010-09-16 2012-03-29 Unitron Technology Inc Manufacturing method by in-mold molding, and case using the manufacturing method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200188244Y1 (en) 2000-02-12 2000-07-15 주식회사해정지점 Case for receiving articles

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012061718A (en) 2010-09-16 2012-03-29 Unitron Technology Inc Manufacturing method by in-mold molding, and case using the manufacturing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200095108A (en) * 2019-01-31 2020-08-10 주식회사 제이 티 Foam article molding apparatus and manufacturing method of foam article using the same
KR102173562B1 (en) * 2019-01-31 2020-11-03 주식회사 제이 티 Foam article molding apparatus and manufacturing method of foam article using the same

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