KR100825826B1 - The apparaus and method of press to forming a polypropylene band with 3 layer - Google Patents

Abstract

An extruding device for a three layer packing band and a method thereof are provided to reduce cost, and to eliminate a toxic ingredient like Pb or Cd by extruding a first and a second surface layer of PP, and an inside layer of more than one of PP(Polypropylene), LLD-PE(Linear Low Density Polyethylene), or HDPE(High Density Polyethylene) simultaneously. In a forming apparatus for a packing PP band consisting of an extruding device(10), a cooling device, a first transport device, a stretching device, a second transport device, and a winding device, the extruding device for a packing band of a three layer structure comprises auxiliary extruding dies(11) pulverizing band surface material forming a first band layer with a screw, melting with a heater, and supplying to the transport unit; an L shaped transport unit(12) connected to the auxiliary extruding dies to transport the melted band surface material to a three layer band forming unit(13); a band inside material supply unit(14) connected to the three layer band forming unit to supply band inside material forming a band inside layer; main extruding dies(15) pulverizing band surface material forming a second surface layer opposite to a first surface layer with a screw, melting with a heater, and supplying to the three layer band forming unit; and the three layer band forming unit connected to the transport unit at one side, connected to the main extruding dies at one rear side, and connected to the band inside material supply unit at one upper side to insert the band inside material between the first and the second band surface material and extrude the first surface layer, the inside layer, and the second surface layer simultaneously.

Description

TECHNICAL APPARATUS AND METHOD FOR PRESSING FORMING A POLYPROPYLENE BAND WITH 3 LAYER

In the present invention, the polypropylene band (PP BAND), which is a packaging band, is simultaneously extruded into a first surface layer, an inner surface layer, and a second surface layer to form a three-layer band shape. The present invention relates to an extrusion apparatus and method for forming a packaging band composed of a forming portion, a band inner surface raw material supply portion, and a main extrusion die.

In general, when storing or transporting an article and a box for packaging, both ends of the band are bound or stored or transported in a state in which the article is wrapped in a packaging band of a predetermined length.

As such, as the packaging band used to bind the packaging box or the like, natural resin or synthetic resin is selectively used according to the purpose. A fine iron core is inserted and used.

This is because the resin used as the packaging band has high flexibility but low toughness and rigidity, and when the iron core is inserted into the resin, the resin can be reinforced with the toughness and rigidity, thereby providing a high traction box. The back can also be safely stored or transported.

In the conventional band, the manufacturing process is mostly wet, i.e., when the band is first heated, and the band is stretched by the heated water. When the product is packaged apart and transported, or exposed to shock, moisture, and ultraviolet rays from the outside, contraction and expansion occur repeatedly, and the tightly banded band becomes loose or broken, causing the loaded product to scatter. The damage caused by the damage and the safety of the product caused a big problem.

In order to solve this problem, Korean Patent Registration Publication No. 10-0647217 is a dry drawing apparatus for forming a packaging band, and an opening and closing handle is formed to close and close a cover near both front ends of the front side, and a horizontal direction is formed inside the cover. Up and down pairs of heaters are formed in a state in which a transfer path for transporting the bands is formed, and a total of 14 pairs of heaters are formed at regular intervals, and an outer front for drying the band B passing through the stretching machine. Although an opening and closing handle is formed near the upper both ends to open and close the cover, there is a drawing apparatus including a dryer 42 having a total of 14 heaters formed in the horizontal direction.

This uses 100% of the polypropylene raw material in the extrusion means, the cost has risen.

In addition, since the molded product is formed of an integral polypropylene band, defects that are easily worn or broken off due to tensile strength and elongation are increased, and harmful substances such as lead and cadmium are easily introduced from the outside during extrusion.

In order to solve the above problems, in the present invention, a polypropylene band (PP BAND), which is a packaging band, is simultaneously extruded into a first surface layer, an inner surface layer, and a second surface layer to form a three-layer band shape, and a first surface layer and a second surface layer. The raw material is supplied to the surface of the polypropylene material, and the inner layer is supplied to the inner material of any one or more of polypropylene, linear low density polyethylene (LLD-PE), and LLD-HD, thereby reducing costs. It is an object of the present invention to provide an extrusion apparatus for forming a packaging band of a three-layer structure that can improve tensile strength and elongation, and is free from hazardous substances such as lead or cadmium.

In order to achieve the above object, an extrusion apparatus for forming a packaging band of a three-layer structure according to the present invention,

It consists of an apparatus for forming a packaging polypropylene band (PP BAND) consisting of extrusion means, cooling means, primary conveying means, stretching means, secondary conveying means, winding means,

The extruding means comprises: an auxiliary extrusion die for crushing the band surface raw material forming the first surface layer of the band with a screw, melting with a heater, and then transferring the band surface raw material to a '-' shaped conveying part;

A 'b' shaped feeder connected to the auxiliary extrusion die and passing the molten band surface raw material through a 'b' shaped feed pipe to be supplied to a three-layer band forming part;

The 'a' shaped conveying part is connected to one side of the side to receive the band surface raw material which forms the first surface layer of the band from the 'a' shaped conveying part, and the second surface layer opposite to the first surface layer by connecting the main extrusion die to one side of the back side. The band surface raw material is formed to be supplied, and the band inner surface raw material supply unit is connected to one side of the upper end to receive the inner band raw material to form the inner layer, and the band inner surface is inserted between the first band surface and the second band surface. A three-layer band forming portion for simultaneously extruding the surface layer, the inner surface layer, and the second surface layer to form a three-layer band shape,

A band inner surface raw material supply unit connected to one side of the upper end of the three-layer band forming unit and supplying a band inner surface raw material for forming an inner layer;

It is achieved by including a main extrusion die which is connected to one side of the rear side of the three-layer band forming portion to form a second surface layer opposite to the first surface layer by crushing with a screw, and melting and supplying it with a heater.

The three-layer band forming unit receives a band surface raw material from the '-'- shaped transfer unit therein and extrudes the first extrusion unit to form a first surface layer of the band;

A third extrusion unit which receives the band surface raw material from the main extrusion die and extrudes to form a second surface layer opposite to the first surface layer;

And a second extrusion unit which receives the band inner surface raw material from the band inner surface raw material supply unit and extrudes to form an inner surface layer inserted between the first surface layer and the second surface layer.

In addition, the extrusion method for forming the band for packaging of the three-layer structure according to the present invention,

When the band surface material of the polypropylene material is injected into the hopper of the auxiliary extrusion die, the screw is rotated and crushed (S100),

In the heater of the auxiliary extrusion die heated to a temperature of 150 ℃ ~ 250 ℃ for 30 minutes to 120 minutes to melt and transfer to the 'b' shaped transfer portion (S200),

And passing the molten band surface raw material from the auxiliary extrusion die through a 'A' shaped conveying pipe and supplying it to the first extrusion part of the three-layer band forming part (S300);

When the polypropylene band surface raw material is put into the hopper of the main extrusion die, the screw is rotated and pulverized.Then, it is heated and melted at a temperature of 150 ° C. to 250 ° C. for 30 minutes to 120 minutes in a heater, and then Supplying to the three extrusion unit (S400),

Supplying a band inner surface raw material for forming an inner surface layer from the band inner surface raw material supply unit to the second extrusion part of the three layer band forming unit (S500);

After checking whether the band surface raw material and the band inner surface raw material were supplied to and filled with the first extrusion part, the second extrusion part, and the third extrusion part in the three-layer band forming part, the first extrusion part, the second extrusion part, and the first extrusion part, respectively. Simultaneously extruding the three extrusion parts to form a polypropylene band (PP BAND) (S600) is characterized in that.

As described above, in the present invention, a polypropylene band (PP BAND), which is a packaging band, is simultaneously extruded into a first surface layer, an inner surface layer, and a second surface layer to form a three-layer band shape, and the first surface layer and the second surface layer The surface raw material of the polypropylene material is supplied, the inner layer of the material is supplied with the inner material of the material mixed with at least one of polypropylene, linear low density polyethylene (LLD-PE), LLD-HD, thereby reducing the cost, It can improve the tensile strength and elongation, there is no harmful substance such as lead or cadmium, there is a good effect that can be recycled.

First, a polypropylene band (PP BAND) formed in a three-layer band type according to the present invention will be described.

As shown in FIG. 4, it is formed in a three-layer band shape consisting of a first surface layer (a), an inner surface layer (b), and a second surface layer (c).

In the present invention, the first surface layer described refers to the top surface of the polypropylene band, the second surface layer refers to the bottom surface of the polypropylene band, and the inner surface layer is an intermediate surface between the top and bottom surfaces of the polypropylene band. Refers to.

The first surface layer and the second surface layer are made of a surface material made of polypropylene, and the inner surface layer is a material in which at least one of polypropylene (PP), linear low density polyethylene (LLDPE) , and high density polyethylene (HDPE) is mixed. It is made of raw material of inner surface.

The polypropylene (PP) is an isotactic polymer obtained by polymerization in the presence of a solvent using an aluminum alkyl / titanium tetrachloride-based Ziegler and tana catalyst, and the density is 0.90, which is the lightest plastic of all plastics. It has a surface excellent in tensile strength and heat resistance.

The linear low density polyethylene (LLDPE) was developed to replace low density polyethylene (LDPE), which is used for films, extrusion coatings, etc., and uses high pressure polyethylene (HDPE) compared to LDPE. Alpha-olefins are introduced into the process to achieve similar properties to LDPE. The linear low density polyethylenes are broadly classified into copolymers using α-olefins as comonomers, LLDPEs using 1-butene as comonomers, and LLDPEs using long α-olefins (hexene, octene, etc.) as comonomers. The characteristic is a density of 0.92 to 0.94 (g / cm 3) crystallinity of 50%.

The high density polyethylenes (HDPE) are polymerized ethylene using a catalyst mainly composed of chromium oxide or molybdenum oxide at 30 to 100 atm, and have a density of 0.0941 to 0.0959 (g / cm 3). Its use is used for packaging, tape, rope and the like.

Hereinafter, the configuration and operation of the extrusion device for forming the packaging band of the three-layer structure of the present invention will be described in detail with the drawings.

1 is a perspective view showing a component of an extrusion apparatus for forming a packaging band of a three-layer structure according to the present invention, which is an auxiliary extrusion die 11, 'b' shaped conveying portion 12, three-layer band formed The part 13, the band inner surface raw material supply part 14, and the main extrusion die 15 are comprised.

The auxiliary extrusion die 11 is a place where the surface material of the band forming the first surface layer of the band is crushed with a screw, melted by a heater, and then transferred to a '-' shaped conveying part, which has a screw having a long axis therein. When the band surface raw material is put into the hopper, it is pulverized while rotating.

Then, after heating for 30 minutes to 120 minutes at a temperature of 150 ℃ to 250 ℃ in the heater to melt and transfer to the 'b' shaped transfer.

The auxiliary extrusion die according to the present invention serves to supply polypropylene, which is a band surface raw material forming the first surface layer of the band, to the three-layer band forming part via the '-' shaped conveying part.

The 'a' shaped conveying part 12 is connected to the auxiliary extrusion die and serves to pass the molten band surface raw material through the 'a' shaped conveying pipe to supply the three-layer band forming part.

The reason why the '-'- shaped conveying part is formed in the'-'shape according to the present invention is to improve the tensile and extension forces of the polypropylene band by improving the fluidity and viscosity of the polypropylene which is the band surface raw material forming the first surface layer of the band. To do this.

The three-layer band forming unit 13 is a 'b' shaped conveying portion is connected to one side of the side receiving the band surface raw material to form a first surface layer of the band from the 'a' shaped conveying portion, the main extrusion die is connected to one side of the rear side And a band surface raw material for forming a second surface layer opposite to the first surface layer, and a band inner raw material supply portion connected to an upper end side to receive a band inner raw material for forming an inner surface layer. A band inner surface is inserted between the surfaces to simultaneously extrude into a first surface layer, an inner surface layer and a second surface layer to form a three-layer band shape.

As shown in FIG. 2, it is formed in a cone shape that becomes wider and narrower from the upper end to the lower end, and has a first extruded part 13a, a second extruded part 13b, and a third extruded part 13c therein. Is composed.

The first extrusion part 13a serves to extrude the band surface raw material from the '-' shape transfer part to form a first surface layer of the band.

The second extrusion unit 13b serves to extrude the inner surface layer to be inserted between the first surface layer and the second surface layer by receiving the inner band material from the inner band material supply unit.

The third extrusion part 13c serves to extrude the band surface raw material from the main extrusion die to form a second surface layer opposite to the first surface layer.

In addition, the first extrusion part 13a, the second extrusion part 13b, and the third extrusion part 13c each having a cone shape are separated from each other at an upper end thereof, and a band surface raw material and a band inner surface raw material are introduced, and one at the bottom. It is configured to be combined into a three-layer band type through the opened outlet 13d of the output.
As such, as shown in FIG. 2, the first extruded portion 13a, the second extruded portion 13b, and the third extruded portion 13c are formed in a cone shape that becomes wider and narrower from the upper end to the lower end, The band surface raw material and the band inner surface raw material extruded from the first extrusion part 13a, the second extrusion part 13b, and the third extrusion part 13c are mixed by being extruded through one opened outlet 13d at the lower end. Instead, the final extrudate 13e combined in a three-layer band form is output.

The band inner surface raw material supply unit 14 is connected to one side of the upper end of the three-layer band forming unit to supply a band inner surface raw material to form an inner layer, which is formed in a rectangular box shape, polypropylene, linear low density polyethylene (LLD- PE), the inner surface of the material mixed with one or more of the LLD-HD is melted and stored.

The main extrusion die 15 is connected to one side of the rear side of the three-layer band forming portion to form a second surface layer opposite to the first surface layer by grinding the screw with a screw and supplying it by melting with a heater. The screw of the long axis is comprised, and when a band surface raw material is thrown into a hopper, it rotates and grinds.

Then, the substrate is heated and melted at a temperature of 150 ° C. to 250 ° C. for 30 minutes to 120 minutes and then supplied to the three-layer band forming unit.

The main extrusion die according to the present invention serves to supply polypropylene, which is a band surface raw material for forming the second surface layer of the band, to the three-layer band forming portion.

Hereinafter, a process of molding a polypropylene band formed in a three-layer band form through an extrusion method for forming a packaging band of a three-layer structure according to the present invention will be described in detail.

The auxiliary extrusion die, the main extrusion die, and the band inner surface raw material supply portion described below are set to be sequence control or simultaneous motion control, so that the polypropylene band (PP BAND), which is a packaging band, is formed of the first surface layer, the inner layer, and the second surface layer. It is configured to be formed into a three-layer band by simultaneously extruding.

First, as shown in FIG. 5, in the auxiliary extrusion die, when the band surface raw material of polypropylene is introduced into the hopper, the screw is rotated and pulverized (S100).

Subsequently, by heating for 60 minutes at a temperature of 200 ℃ in the heater and melted and then transferred to the 'b' shaped transfer (S200).

Subsequently, in the 'a' shaped conveying part, the band surface raw material melted from the auxiliary extrusion die is passed through the 'a' shaped conveying pipe and supplied to the first extrusion part of the three-layer band forming part (S300).

At the same time, in the main extrusion die, when the polypropylene band surface raw material is introduced into the hopper, the screw is rotated and pulverized, and is heated and melted for 60 minutes at a temperature of 200 ° C. in a heater to a third extrusion part of the three-layer band forming part. Supply (S400).

Next, the band inner surface raw material supply unit supplies the band inner surface raw material for forming the inner surface layer to the second extrusion part of the three-layer band forming unit (S500).

Subsequently, in the three-layer band forming unit, it is checked whether the band surface raw material and the band inner surface raw material are filled and filled in the first extrusion part, the second extrusion part, and the third extrusion part, respectively, and then the first extrusion part and the second extrusion part. At the same time, by extruding the third extrusion portion to form a three-layer band polypropylene band (S600).

Subsequently, the band discharged from the extrusion device 10 for forming the packaging band of the three-layer structure according to the present invention is transferred to the cooling means 20 and cooled.

Subsequently, the band cooled by the primary transfer means 30 is transferred to the stretching means 40.

Then, it is conveyed to the stretching means 40 to stretch the band transferred through the primary transport means 30.

Subsequently, the band B drawn by the stretching means 40 is transferred through the secondary transfer means 50.

Subsequently, the band B transferred from the secondary transfer means 50 is wound up by the winding means 60 to complete the three-layer band type polypropylene band.

Hereinafter, the components of the molded three-layer band-type polypropylene band were detected as shown in Table 1 and Table 2 through the extrusion device for molding the packaging band of the three-layer structure according to the present invention.

Table 1: Polypropylene Band Heavy Metals ( Heavy Metals ) Detection test result

Item unit MDL result  cadmium( Cadmium , CD ) mg Of kg 0.5 Not detected  lead( Lead , Pb ) mg Of kg 5 Not detected  Mercury( Merury , Hg ) mg Of kg 2 Not detected  Hexavalent chromium ( Hexavalent Chromium , Cr VI ) mg Of kg One Not detected

( MDL  = Method Detection Limit Analysis limit of detection, the test for Table 1 is Cd, Pb , Hg In the case of US EPA  3025 (1996), US EPA  6010B, ICP Use method. Cr Vl For US EPA  3060A (1996), US EPA  7196A (1992), UV Using method.)

As shown in the detection test results of Table 1, the three-layer band type polypropylene band did not detect any heavy metals such as cadmium, lead, mercury, and chromium.

Table 2: Polypropylene Band Bromine ( Br )system Flame retardant  matter( PBBs Of PBDEs Detection test result

Item unit MDL result  Monobromobiphenyl mg / kg 5 Not detected  Dibromobiphenyl mg / kg 5 Not detected  Tribromobiphenyl mg / kg 5 Not detected  Tetrabromobiphenyl mg / kg 5 Not detected  Pentabromobiphenyl mg / kg 5 Not detected  Hexabromobiphenyl mg / kg 5 Not detected  Heptabromobiphenyl mg / kg 5 Not detected  Octbromobiphenyl mg / kg 5 Not detected  Nonabromobiphenyl mg / kg 5 Not detected  Deccabromobiphenyl mg / kg 5 Not detected  Monobromobiphenyl ether mg / kg 5 Not detected  Dibromodiphenyl ether mg / kg 5 Not detected  Tribromodiphenyl ether mg / kg 5 Not detected  Tetrabromodiphenyl ether mg / kg 5 Not detected  Pentabromodiphenyl ether mg / kg 5 Not detected  Hexabromodiphenyl ether mg / kg 5 Not detected  Heptabromodiphenyl ether mg / kg 5 Not detected  Octabromophenyl ether mg / kg 5 Not detected  Nonabromodiphenyl ether mg / kg 5 Not detected  Decabromodiphenyl ether mg / kg 5 Not detected

(MDL = Method Detection Limit: Test for Table 2 using US EPA 3540C, GC / MS method)

As shown in Table 2, in the three-layer band-type polypropylene band, no PBB (polybrominated biphenyl) or PBDE (Polybrominated biphenyl ethers) components having a molecular structure having Br attached to the benzene ring were detected.

1 is a perspective view showing the components of an extrusion apparatus for forming a packaging band of a three-layer structure according to the present invention,

Figure 2 is an internal perspective view showing the components of the three-layer band forming portion 13 of the components of the extrusion device for forming the packaging band of the three-layer structure according to the present invention,

3 is made of an extrusion means 10, cooling means 20, primary conveying means 30, stretching means 40, secondary conveying means 50, winding means 60, polypropylene band for packaging (PP) An embodiment showing an apparatus for forming a BAND),

Figure 4 is an embodiment showing a polypropylene band of the three-layer band-shaped molded through an extrusion device for molding the packaging band of the three-layer structure according to the present invention.

Figure 5 is a flow chart illustrating an extrusion method for forming a packaging band of a three-layer structure according to the present invention.

※ Brief description of reference numerals ※

10: extrusion means 20: cooling means

30: primary transfer means 40: stretching means

50: secondary conveying means 60: winding means

Claims (5)

Extrusion means 10, cooling means 20, the primary conveying means 30, the stretching means 40, the secondary conveying means 50, the winding means 60 consists of a packaging polypropylene band (PP BAND) In the molding apparatus, The extruding means 10 is a secondary extrusion die 11 for crushing the band surface raw material forming the first surface layer of the band with a screw, melted by a heater and then conveyed to the 'b' shaped conveying portion; 'A' shaped conveying part 12 connected with the auxiliary extrusion die 11 and passing the molten band surface raw material through the 'A' shaped conveying pipe to supply to the three-layer band forming part, The 'a' shaped conveying part 12 is connected to one side of the side to receive the band surface raw material forming the first surface layer of the band from the 'a' shaped conveying part, and the main extrusion die is connected to one side of the rear side to be opposite to the first surface layer. A band surface raw material is formed to form a second surface layer, and a band inner raw material supply part is connected to an upper end side to receive a band inner raw material to form an inner surface layer, and an inner band of the band is inserted between the first band surface and the second band surface. A three-layer band forming portion 13 which simultaneously extrudes into a first surface layer, an inner surface layer, and a second surface layer to form a three-layer band shape, A band inner surface raw material supply unit 14 connected to an upper end side of the three-layer band forming unit 13 and supplying a band inner surface raw material for forming an inner surface layer; Consists of a main extrusion die 15, which is connected to one side of the rear surface of the three-layer band forming unit 13 to form a second surface layer opposite to the first surface layer by pulverizing with a screw, and melting and supplying it with a heater. Extrusion apparatus for forming a band for packaging of a three-layer structure, characterized in that According to claim 1, The three-layer band forming unit 13 is a first extrusion unit 13a for extruding to receive the band surface raw material from the '-'- shaped transfer portion therein to form a first surface layer of the band, A third extrusion portion 13b which receives the band surface raw material from the main extrusion die and extrudes to form a second surface layer opposite to the first surface layer; A three-layer pavement band molding comprising a second extrusion portion 13c which receives the band inner raw material from the inner band raw material supply part and extrudes to form an inner surface layer inserted between the first surface layer and the second surface layer. Extruder for. When the band surface material of the polypropylene material is injected into the hopper of the auxiliary extrusion die, the screw is rotated and crushed (S100), In the heater of the auxiliary extrusion die heated to a temperature of 150 ℃ ~ 250 ℃ for 30 minutes to 120 minutes to melt and transfer to the 'b' shaped transfer portion (S200), And passing the molten band surface raw material from the auxiliary extrusion die through a 'A' shaped conveying pipe and supplying it to the first extrusion part of the three-layer band forming part (S300); When the polypropylene band surface raw material is put into the hopper of the main extrusion die, the screw is rotated and pulverized.Then, it is heated and melted at a temperature of 150 ° C. to 250 ° C. for 30 minutes to 120 minutes in a heater, and then Supplying to the three extrusion unit (S400), Supplying a band inner surface raw material for forming an inner surface layer from the band inner surface raw material supply unit to the second extrusion part of the three layer band forming unit (S500); After checking whether the band surface raw material and the band inner surface raw material were supplied to and filled with the first extrusion part, the second extrusion part, and the third extrusion part in the three-layer band forming part, the first extrusion part, the second extrusion part, and the first extrusion part, respectively. Simultaneously extruding the three extruded parts to form a polypropylene band (PP BAND) (S600) extrusion method for forming a packaging band of a three-layer structure, characterized in that. The polypropylene band (PP BAND) according to claim 3, wherein the polypropylene band (PP BAND) is formed in a three-layer band structure consisting of a first surface layer (a), an inner surface layer (b), a second surface layer (c). Extrusion method for forming bands for packaging. According to claim 3, wherein the band inner surface material is made of a material in which at least one of polypropylene (PP), linear low density polyethylene (LLDPE) , high density polyethylene (HDPE) is mixed, the first surface layer (a) and the second surface layer Extrusion method for forming a band for packaging of a three-layer structure, characterized in that the interlayer (b) is inserted between (c) to form an inner surface layer (b).

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