KR100415967B1 - Method for producing integrated pallet by blowing, device for the method and pallet produced by the method and the device - Google Patents

Abstract

PURPOSE: A blow-type pallet manufacturing method, a forming device thereof, and a pallet produced by the method and device are provided to wholly reuse the pallets, to use environmental friendly materials, and to secure excellent strength against impact, torsional strength, and compressive strength without being broken down by melting high-temperature resin with a blow molding method. CONSTITUTION: A blow-type pallet manufacturing method is composed of steps for melting raw materials at the predetermined temperature(10); pre-blowing the molten raw materials(20); forming parison by extruding the pre-blown raw materials(30); leading the parison into an opened mold(40); and blow-molding by clamping the mold(50). The raw materials contain polyethylene of 50¯60 wt%, recycled resin of 40¯50 wt%, and color master batch of 0.5¯4 wt%. The blow molding step repeatedly injects and discharges high-pressure air into and out of the mold and circulates coolants over the surface of the mold.

Description

TECHNICAL FOR PRODUCING INTEGRATED PALLET BY BLOWING, DEVICE FOR THE METHOD AND PALLET PRODUCED BY THE METHOD AND THE DEVICE}

The present invention relates to a high density, high strength pallet and a method for producing the pallet, and more particularly to a method for producing a blow-integrated pallet of high density and high strength, to a pallet produced by the pallet forming apparatus and method will be.

Pallets are essential for the convenient or quick and accurate handling of transportation and storage of goods or products in industrial or distribution industries. In general, pallets are woven into a grid of wood with a certain thickness or width, It consisted of fastening fixtures such as nails. Such wooden pallets have a problem in that their strength is weak and their service life is short. Particularly, when the wooden pallets are used as stockpiles of articles stored in the open air such as bricks or stones, the wooden pallets are exposed to moisture or moisture, In this case, the water may soak into the wood, causing the wood to be deformed, causing the wood to break down and causing mold to cause odor, as well as damage to the red product stored above.

Pallets made of synthetic resin (plastic) have been developed and utilized to reinforce the disadvantages of breakage and weak strength of wooden pallets, but pallets made of synthetic resin have been mass-produced and reinforced with strength. While the service life is extended, there is a disadvantage in that the manufacturing method of injection molding in one piece is very heavy. In addition, it uses a method of forcibly injecting raw materials into a predetermined mold frame and producing each plate, and then re-melting them using processing equipment. Therefore, the facility investment costs are high and the coefficient of friction is small. Is generated. In addition, the welding part is cracked and the durability is short. Therefore, such injection-type plastic pallets also lower the loading efficiency, causing a significant increase in logistics costs and causing environmental problems, such as not being recycled.

In recent years, conventional steel pallets have been produced to compensate for this problem, but the number of parts has increased, resulting in increased production costs, mass production, and difficulty in automation.The assembled piece bolts are easily relaxed by vibrating load when used for a long time. Disadvantages and short-lived shortcomings have emerged, and since the entire pallet has been manufactured up to the leg part, it is difficult to meet all the problems such as excessive input of equipment costs. Had many issues.

Therefore, the disadvantages of the existing wood is easily damaged, decayed by moisture, weak durability, manufacturing is rough and easily transformed into loading, impact, etc., the increase in facility investment cost of conventional injection-type plastic pallet, weak durability, heavy weight and Due to the effects of waste generation due to the difficulty of recycling, secondary pollution, and the handling characteristics of other existing steel pallets, such as the need to prevent slipping and irregularities attached to the disadvantages of these existing pallets There have been a number of demands in the art for lighter, combustible, and environmentally friendly pallets as a supplement to the weakness of the brittleness of plastic injection products and the moisture of wood pallets.

Accordingly, the present invention is to provide a method for producing a pallet using a 100% recyclable and environmentally friendly material, the pallet forming apparatus and the method for solving the above problems.

It is also an object of the present invention to provide a method for producing a pallet having moisture resistance, enhanced durability and reduced weight, and a pallet produced by the pallet forming apparatus and method.

In addition, another object of the present invention is to produce a pallet excellent in impact strength, torsional strength, and compressive strength, so that the high-temperature resin is directly fused by using the blow method to be broken even in the worst conditions, the pallet forming apparatus and method It is to provide a pallet produced by.

In addition, another object of the present invention is to use both sides of the pallet, non-slip jaw is formed can be used safely, provides a method for producing a pallet, manufacturing the pallet by the pallet forming apparatus and method reduced manufacturing cost It is.

1 is a flow chart of a blow integrated pallet manufacturing method according to an embodiment of the present invention

2 is a block diagram of an extruder of the molding apparatus according to the present invention

Figure 3 is a shape diagram in which the parison formed from the abrasion muzzle of the molding apparatus according to the present invention is guided to the mold

Figure 4 is a block diagram of a drawing device of the Parison guided to the mold of the molding apparatus according to the present invention

Figure 5 is an operation of the vacuum control system of the molding apparatus according to the present invention

Figure 6 is a mold plan view of the molding apparatus according to the present invention

Figure 7 is a plan view and cross-sectional view of one embodiment of a blow integral pallet made by the apparatus and method described above.

Figure 8 is a detailed view of the bonding structure of the pallet of Figure 8

Figure 9 is a detailed view of the groove structure of the pallet of Figure 8

* (Explanation of symbols for main parts of drawing)

110: extruder

120: shock absorber 121: shock absorber head

130: Parison 140: mold

151: spread pin 152: blow pin

161; Air Venting Hole 162: Blowing Hole

170: Pallet

In order to achieve the above object, the present invention comprises the steps of melting the raw material at 180-210 ?? as an embodiment; Pre-blowing the molten raw material; Extruding the preblown raw material to form a parison; Directing the parison to a mold in an open state; It provides a blow-integrated pallet manufacturing method comprising a blow molding step of tightening the mold and blow molding.

The present invention provides a blow-integrated pallet production method comprising, as an embodiment, the raw material comprising 50-60 wt% polyethylene, 40-50 wt% recycled resin, and 0.5-4 wt% color master batch.

The present invention provides a blow integral pallet manufacturing method, characterized in that the pre-blowing is performed using fine air in an air channel inside an accumulator head.

The present invention is a blow integrated pallet manufacturing method comprising the step of forming the parison as an embodiment comprising the step of storing the molten raw material at a constant temperature by an amusator to push at a hydraulic pressure To provide.

The present invention is a mold made in the form of an intaglio, an embossed in the same way as the shape of the pallet to be manufactured by the mold, characterized in that it has a joint structure of KISS-OFF shape to directly weld the raw materials in the molten state Provided is a blow integrated pallet manufacturing method.

In one embodiment, the blow molding step provides a blow-integrated pallet manufacturing method comprising repeating injection and discharge of high-pressure air into a mold.

The blow molding step as an embodiment of the present invention provides a blow-integrated pallet production method comprising the step of circulating the cooling water to the mold surface.

In one embodiment, an extruder for forming a parison, a means for supplying the parison to a mold, and a means for blowing air into the parison, the extruder comprising: It includes an accumulator for storing the molten raw material forming the parison at a constant temperature and then pushed out by hydraulic pressure, the capacity of the accumulator is 30-60kg and the head of the amulet The mold has a shape suitable for production, and the mold is a frame made of an intaglio, an embossed model in the same way as the shape of the pallet to be manufactured, and has a joint structure of a KISS-OFF shape in which raw materials are directly fused in a molten state. Provided is a blow integrated pallet molding apparatus.

The present invention provides a blow-integrated pallet molding apparatus as an embodiment comprising a cooling water line and an air vent line for rapid cooling around the mold.

The present invention provides a blow-integrated pallet molding apparatus as an embodiment, further comprising a vertical wall thickness distribution system (VWDS) for adjusting the thickness of the pallet.

The present invention provides a blow-integrated pallet molding apparatus as an embodiment, further comprising a device for stretching the parison to meet the specifications of the pallet to make the thickness distribution constant in the circumferential direction and the longitudinal direction.

The present invention provides a blow integral pallet molding apparatus as an embodiment, further comprising a device for pulling the fly hand in close contact with the mold wall.

The present invention provides a blow-integrated pallet molding apparatus as an embodiment, further comprising a device for expanding the parison to the same size every time after injecting constant air into the parison.

The present invention provides, as one embodiment, a blow-integrated pallet manufactured by the above-described manufacturing method or apparatus.

The present invention provides a blow-integrated pallet, characterized in that the pallet is the upper body, the lower body is integral, so that both sides can be used, and an insertion groove is formed in which the forklift leg can be inserted in all directions.

The present invention provides a blow-integrated pallet, characterized in that the pallet has a groove shape reinforced with force on the X, Y, Z axis.

Hereinafter, a blow integrated pallet production method according to the present invention, the pallet production apparatus and the pallet produced by the method and apparatus will be described according to the embodiment shown in the accompanying drawings. This embodiment is only illustrative for the purpose of understanding and is not intended to limit the invention.

Referring to Figure 1 describes an embodiment of a blow integrated pallet manufacturing method according to the present invention.

First, the raw material melting step 10 melts and kneads the selected raw material in an extruder barrel. At this time, the melting temperature is preferably 180-210 ??. On the other hand, the raw material used in the present invention is a composition in which polyethylene, recycled resin and color master batches are mixed at a constant ratio in consideration of the weight and strength of the pallet. The polyethylene here is preferably High Density Polyethylene (HDPE). The raw material composition is preferably 50-60% by weight of polyethylene, 40-50% by weight of recycled resin and 0.5-4% by weight of color master batches. The polyethylene, the recycled resin and the color master batch may be any one readily available in the art, but the color master batch may include HDPE, UV stabilizer, minerals (stones, etc.) and pigments. It is preferable to use what does.

In the pre-blowing step 20, the molten raw material is blown in advance in the air channel inside the agitator head using fine air to prevent the raw material from being entangled. This is necessary to ensure constant insertion into the mold when shooting with a defined length.

The parison forming step 30 is a step of forming the parison by extruding the pre-blown raw material from the agitator head. In order to form the parison, the at least one pre-blowed raw material is stored at a constant temperature, and then pushed to a hydraulic pressure, preferably at 210 bar, to form a parison through the ambusher head core. Conventionally, the blowing method is not applied to flat products but is applied only to hollow products, so that the raw material filling amount is only 20 kg to be suitable for the production of small drums and plastic fuel tanks. Specially designed to produce 30-60kg suitable for mold pallet production. As a result, the die tool connected to the shock absorber head is also specially designed so as not to be limited by the width of the product, so that it can be applied to production of up to 1,400 mm width.

The step of guiding the parison to the mold (40) allows the parison to be removed from the ambusher head via the pre-blow pipeline, taking care not to cause interference by the left and right molds when the ambusher head is lowered. When delivered to the mold, there is no shaking left and right to lead to the mold. At this time, the parison must be larger than the mold size to produce the integral blown pallet. If the size of the parison is smaller than the mold size, the thickness of the edge of the finished pallet becomes thin. Here, the mold is a frame made of an intaglio and an embossed model in the same way as a pallet to be manufactured, and may be a structure divided into a plurality of components, and has a KISS-OFF-shaped joint structure in which raw materials are directly fused in a molten state. .

In the blow molding step 50, when the flyson is delivered into the mold, the die is tightened by a clamping unit of a known configuration to close the mold, and the flyson is injected to the mold surface while the high pressure air is repeatedly injected and discharged into the mold. Close contact Here, when the pressure of the air is 10kg / ㎠, the injection and discharge of the high-pressure air is preferably 5-6 times, two air injection pins and two discharge pins inside the mold to shorten the molding time of the pallet It can be provided to facilitate the blowing by the air. At this time, the blow molding step 50 is to stretch the flyson according to the specifications of the pallet to uniform thickness distribution in the wandering direction and the longitudinal direction, each time after the injection of a constant air into the flyson of the same size Expanding the fly hand into the area, and pulling the fly hand instantaneously to bring it into close contact with the mold wall. In addition, since the blow molding step 50 has a high temperature inside the mold, it is preferable to lower the temperature inside the mold while circulating the cooling water to the mold surface.

The finishing step 60 is to take out the cooled pallet and cut and process unnecessary parts to desired dimensions. The cooled pallet can be automatically taken out using a robot or the like.

2 to 9, the embodiment of the blow integrated pallet molding apparatus of the present invention will be described in detail.

First, the blow integrated pallet forming apparatus of the present invention comprises an extruder for forming a parison, a means for supplying the parison to a mold, and a means for blowing air into the parison, like a known blowing apparatus. .

Figure 2 is a configuration diagram of an extruder of the molding apparatus according to the present invention, the extruder 110 includes an ammunizer 120, the ammunizer 120 is a molten raw material forming the parison at a constant temperature As a device for pushing out by hydraulic pressure after storage, the raw material filling capacity is 30-60kg and the head 121 of the shock absorber has a shape suitable for pallet production.

FIG. 3 is a shape diagram in which the parison 130 formed from the shock absorber 120 is guided to the mold 140. As shown in FIG. 3, left and right molds are delivered when the parison 130 is guided. Interference should not occur in 140, and the size of the parison 130 should be larger than the size of the mold 140.

4 is a drawing of a drawing device of the parison 130 guided to the mold 140. As shown in FIG. 4, the drawing device includes a spread pin 151 and a blow pin 152. When the parison 130 is led to the mold 140, the parison 130 is positioned at the center thereof, and when the parison 130 is completely guided to the lower part of the mold 140, the parison 130 is stretched to the left and right. Here, the function of the spread pin 151 is to vent the air, and the function of the blow pin 152 is to inject air to form a pallet, and then the flyson 130 in the mold 140. To expand in

Fig. 5 is an operation diagram of the vacuum control system, in which the parison 130 is pulled in vacuum to closely adhere to the mold 140 wall in order to secure a sufficient thickness of the edge portion of the pallet. The system is used to produce holes (161, 162) in the four corners of the mold after inserting the air vent during manufacture of the mold (140) and connected to the air valve line. In particular, the device is not shown as a device that draws the fly hand in close contact with the mold wall instantaneously, but the deep portion of the corner of the mold to maintain the circle without stretching the fly hand, the other plane section by the amount of free blow air It is further provided with a device for guiding the fly hand naturally.

Meanwhile, although not shown, the molding apparatus of the present invention may further include an air control system capable of adjusting the size of the parison every time by using the same air and the same pressure at the time of air blowing.

In addition, although not shown, the molding apparatus of the present invention may further include a VWDS (Vertical Wall Thickness Distribution System) having a known configuration for automatically adjusting the thickness of the pallet to an input value.

Figure 6 is a mold made as a model of the intaglio, embossed as the shape of the pallet to be produced as a mold plan view of the molding apparatus according to the present invention in a structure that can be produced after easily changing the core block up and down, left and right, It may be divided into a plurality of partitions. In addition, the mold 140 has a joint structure of KISS-OFF shape in which the raw materials are directly fused in a molten state, and the thickness of the produced product is at least 5 mm or more.

7 is a plan view and a cross-sectional view of one embodiment of a blow-integrated pallet manufactured by the above-described apparatus and method. Referring to FIG. 7, the upper and lower bodies are integral and can be used on both sides, and the forklift legs can be inserted in all directions. Insertion grooves are formed, and it can be seen that the groove shape is reinforced with strength in the X, Y, Z axis for durability improvement. Particularly, the pallet 170 manufactured by the method and apparatus according to the present invention further has a groove shape in which the convexities and convexities of the joints are provided in the KISS-OFF shape in which the raw materials are directly fused in order to reinforce the strength as described above. To compensate for sag and stiffness. This structure also reduces the weight by 40-60% compared to conventional injection pallets. .

That is, the blow-integrated pallet of the present invention, as can be seen in the KISS-OFF-shaped joining structure of Figure 8, is the form in which the same heated resin is bonded by the unevenness of the mold to compensate for the disadvantages of the conventional heat fusion method more robust And there are no joints in the welded part, and as can be seen from the groove-shaped structure of Fig. 9, the loads of the finished product are effectively dispersed to reinforce the strength on the X, Y, and Z axes in order to supplement the strength and prevent the product from breaking. It has a groove shape.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, in the present invention, the blow integrated pallet manufacturing method and the molding apparatus, the pallet produced by the method and the apparatus has the following effects.

First, the pallet produced by the manufacturing method and the molding apparatus of the present invention is 100% recyclable and uses environmentally friendly materials, but is manufactured by directly fusion of a high temperature resin using a blow method so that it is not broken even in the worst conditions. Excellent impact strength, torsional strength and compressive strength.

In addition, the pallet produced by the manufacturing method and the molding apparatus of the present invention is moisture resistant, has enhanced durability and reduced weight, and in particular, in order to reinforce the strength of the pallet, irregularities are provided at the joints of the raw materials to compensate for sag and rigidity.

In addition, the pallet produced by the manufacturing method and the molding apparatus of the present invention reduced the weight by 40-60% compared to the conventional injection-type pallet.

In addition, the pallet produced by the manufacturing method and the molding apparatus of the present invention can be used both sides, non-slip jaw is formed can be used safely, manufacturing cost is reduced.

Claims (16)

Melting the raw material at 180-210 ?? Pre-blowing the molten raw material; Extruding the preblown raw material to form parison; Directing the parison to a mold in an open state; Blow molding pallet production method comprising the blow molding step of clamping the mold and blow molding. The method of claim 1, wherein the raw material is 50-60% by weight polyethylene, 40-50% by weight of recycled resin and 0.5-4% by weight of the color master batch production method. The method of claim 1, wherein the pre-blowing is performed using fine air in an air channel inside an accumulator head. The method of claim 1, wherein the forming of the parison comprises storing the molten raw material at a constant temperature by an ammulator and pushing the hydraulic material under hydraulic pressure. The blow mold of claim 1, wherein the mold is a mold made of an intaglio and an embossed model in the same manner as a pallet to be manufactured, and has a joint structure of a KISS-OFF shape in which raw materials are directly fused in a molten state. Pallet manufacturing room. The method of claim 1, wherein the blow molding step includes repeating injection and discharge of high-pressure air into the mold. The method of claim 1, wherein the blow molding step comprises the step of circulating the cooling water to the mold surface blow integral pallet manufacturing method. A blow molding apparatus comprising an extruder for forming a parison, a means for supplying the parison to a mold, and a means for blowing air into the parison, The extruder includes an accumulator which stores the molten raw material forming the parison at a constant temperature and then pushes it to a hydraulic pressure, wherein the capacity of the accumulator is 30-60 kg, The head has a shape suitable for pallet production, The mold is a frame made of an intaglio, an embossed model in the same manner as the shape of the pallet to be manufactured, the blow integral pallet molding apparatus characterized in that it has a KISS-OFF-shaped joining structure that directly fusion raw materials in the molten state. The blow integrated pallet forming apparatus of claim 8, further comprising an air vent line for further cooling to improve adhesion between the cooling water line and the resin for rapid cooling around the mold. 10. The apparatus as claimed in claim 8, further comprising a vertical wall thickness distribution system (VWDS) for automatically adjusting the thickness of the pallet to an input value. The blow integrated pallet molding apparatus according to claim 8, further comprising a device for stretching the parison to meet the specifications of the pallet so as to uniformly distribute the thickness in the circumferential direction and the longitudinal direction. 9. The apparatus as claimed in claim 8, further comprising a device for pulling the fly hand in close contact with the mold wall. The blow integrated pallet forming apparatus of claim 8, further comprising a device for expanding the parison to an area having the same size every time after the constant air is injected into the parison. A blow integral pallet made by the method or apparatus of any one of claims 1 to 11. 15. The method of claim 14, The pallet is a blow-integrated pallet, characterized in that the upper body, the lower body can be used as both sides can be used, the forklift leg can be inserted in all directions is formed. 15. The integrated pallet pallet according to claim 14, wherein the pallet has a groove shape reinforcing force on the X, Y, and Z axes.