CN111232374A

CN111232374A - Light tray and preparation method thereof

Info

Publication number: CN111232374A
Application number: CN202010053383.4A
Authority: CN
Inventors: 周大鹏; 盛新光; 张玉兰
Original assignee: Beijing Zhongyuren Technology Co ltd
Current assignee: Beijing Zhongyuren Technology Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-06-05

Abstract

The invention relates to the technical field of logistics transportation auxiliary equipment, in particular to a light tray and a preparation method thereof. A light tray comprises a panel and supporting legs, wherein the supporting legs are arranged at the bottom of the panel. A method of making a lightweight pallet comprising the steps of: feeding the PMI foam material into a tray mold for shaping to obtain an integral tray; separating the whole tray from the tray mold, and drying to obtain a tray substrate; polyurea resin and PBO fiber are mixed and sprayed on the surface of a tray matrix to form a uniform fiber coating, and the light tray is prepared. The light tray has the advantages of small mass, strong bearing capacity, moisture resistance, water resistance, fire resistance, environmental protection and energy conservation. The problem of tray quality that uses at the commodity circulation transportation at present is too big, and is difficult to the effective compromise load nature, feature of environmental protection and energy-conservation nature is solved.

Description

Light tray and preparation method thereof

Technical Field

The invention relates to the technical field of logistics transportation auxiliary equipment, in particular to a light tray and a preparation method thereof.

Background

In the logistics transportation process, need lay up the tray below the goods, its effect lies in reserving accommodation space for the fork of fork truck. At present, the material of the pallet applied to logistics transportation mainly comprises metal, wood and hard plastic. Among them, the metal pallet has a high load capacity, but has a large mass, is easily corroded, and has a high production cost. The pallet made of wood is low in preparation cost, but is easy to rot and short in service cycle. The pallet made of the hard plastic material can reduce the load requirement of the forklift to a certain extent, but has poor buffering performance, is fragile and easy to age, is easy to break and pollutes the environment.

Based on the tray that present commodity circulation transportation process used, it is difficult to effective compromise load nature, feature of environmental protection and energy-conservation nature, consequently, provides a load performance reinforce, and energy-conserving, the light tray of environmental protection becomes the urgent problem that awaits solution in the industry.

Disclosure of Invention

The invention aims to solve the technical problem of providing a light pallet and a preparation method thereof, and solves the problems that the pallet used in the logistics transportation process is overlarge in mass and the loading property, the environmental protection property and the energy saving property are difficult to be effectively considered.

The technical scheme for solving the technical problems is as follows:

a lightweight pallet comprising a deck and feet, the feet being disposed at the bottom of the deck;

the supporting legs are provided with a plurality of groups, each group of supporting legs is arranged along the length direction of the panel, and the distance between every two adjacent supporting legs in each group of supporting legs is equal;

the panel and the support leg are prepared from PMI foam materials, polyurea resin and PBO fibers.

The light panel is composed of a panel and a support leg, and the panel can bear goods. The bottom of panel sets up the stabilizer blade, and the stabilizer blade is including dividing into a plurality of groups, and the length direction setting of panel is followed to every group stabilizer blade, and the interval of every two adjacent stabilizer blades of group equals. This kind of setting mode can provide the support for the panel on the one hand, and on the other hand can reserve accommodation space for fork truck's fork. The light tray provided by the invention has the support legs with unique design. When the forklift transfers the light pallet and the goods carried by the light pallet, the four-side fork can be realized. Compared with a common pallet with two sides entering the fork, the light pallet is more convenient. Of course, the lightweight tray provided by the invention can be designed into a four-side fork type or a two-side fork type aiming at the personalized customization of customers.

The panel and the support foot are prepared from PMI foam materials, polyurea resin and PBO fibers.

PMI foams, i.e. polymethacrylimides, have performance advantages: the composite material has high mechanical property, high specific strength and high specific modulus, the tensile strength, the compressive strength, the bending strength, the shearing strength and the like of the composite material are far superior to those of other foams or balsa wood core materials such as pvc, pu, pet and the like, and the composite material is isotropic, so that the strength can be improved, the rigidity can be improved, and the weight can be reduced; the high-temperature-resistant polyimide resin has high heat resistance, unique cross-linking structure and imide ring structure, good high-temperature stability and pressure resistance, and thermal deformation temperature of 200 ℃, is suitable for a high-temperature mould pressing or vacuum autoclave co-curing molding process, shortens the process time, improves the production efficiency and improves the structural performance; the composite sandwich core material has high closed pore rate of 95-98%, can avoid the problems of moisture absorption and degumming of the honeycomb core material when used for a composite sandwich structure, improves the safety performance and prolongs the service life. The material has good heat insulation and moisture insulation properties due to high closed porosity and fine and uniform foam pores; the PMI foam material is easy to bond, can adapt to various resin systems such as epoxy, unsaturated polyester and the like, and has high bonding strength; the processing convenience is realized, various curved surfaces can be formed by bending under the heating condition, and the design freedom degree is improved; the composite sandwich structure has fatigue resistance, and the unique molecular structure endows the composite sandwich structure with good fatigue resistance, thereby being particularly suitable for a composite sandwich structure bearing dynamic load.

The polyurea resin has the advantages of light weight, weight resistance, fire resistance and corrosion resistance. The polyurea resin has very light weight, strong compression resistance and impact resistance, and can not generate cracks even if being impacted heavily. The polyurea resin also has the function of fire prevention, has good corrosion resistance, and cannot be corroded and aged in seasonal changes no matter the polyurea resin is exposed to the sun and rain.

The heat resistance of the PBO fiber is quite high, and the thermal mass analysis structure shows that the pyrolysis temperature in the air is more than 500 ℃, and the PBO fiber is only decomposed by 28% at 1000 ℃; the PBO fiber can fibrillate to absorb a large amount of impact energy when being impacted, and is an excellent impact-resistant material, and the maximum impact load and the energy absorption of the PBO fiber are higher than those of aramid fiber and carbon fiber; the PBO fiber has good stability, and the plastic deformation of the PBO fiber under 50 percent of breaking load for 100 hours is not more than 0.03 percent; finally, the PBO fiber has excellent wear resistance and bending fatigue resistance.

According to the light tray provided by the invention, the panel and the support legs are mainly made of PMI foam materials, so that the light tray not only has the advantages of small mass, good pressure resistance and strong bearing capacity, but also has good stability and long service life. The surfaces of the panel and the support legs are treated by polyurea resin and PBO fiber materials, so that the light tray is fireproof, corrosion-resistant, wear-resistant and strong in impact resistance. In addition, the raw materials for preparing the light pallet are inorganic and plant fibers, and the core material is impregnated by fireproof resin, so that the radioactivity meets the national standard, and the environmental protection performance meets the national regulation. The diagonal change rate of the light pallet is not more than 4% through an angular drop test; the damage or damage degree has no influence on the performance or the function of the tray; the recycling rate of the lightweight tray was 100%. Therefore, the light tray also has the advantage of energy conservation.

Further, the panel is cuboid; the top of the panel is provided with a groove; the distance between two adjacent groups of the supporting feet is equal.

The panel of the light pallet is cuboid, and the stability of the forklift for conveying goods by utilizing the pallet can be guaranteed. The top of the panel is provided with a groove so as to increase the friction force between the light pallet and the loaded goods, and the groove can also play the roles of flow guiding and weight reduction. The distance between two adjacent groups of the support legs is equal, and the four-side fork entering is also guaranteed.

Further, each one side that the stabilizer blade is kept away from the panel is equipped with a plurality of follow the stabilizer blade to the cavity that the panel extends, every in the stabilizer blade, adjacent two the interval of cavity equals, just the cavity is the triangular prism shape.

The cavity is arranged on each supporting leg, so that the whole weight of the tray is reduced as much as possible while the light panel is ensured to function. The cavity is arranged to be triangular prism shape, which can reduce the weight of the supporting leg to the maximum extent. In addition, the cavity is not limited to a triangular prism shape, and may be provided in a rectangular parallelepiped shape, a cylindrical shape, or the like.

The light tray provided by the invention has the other purpose that the support legs are provided with the cavities, so that the position and the running track of the tray can be tracked and positioned, and the flow direction of the tray can be continuously monitored in order to conveniently implant an intelligent device of the internet of things. Sensors for environmental monitoring, such as temperature sensors or humidity sensors, may also be added.

Further, the length of the panel is 1000-1400mm, the width is 800-1200mm, and the thickness is 40-60 mm; the height of the support legs is 80-100mm, and the distance between two adjacent support legs in each group of support legs is 280-400 mm.

The light tray provided by the invention has the following main specifications: 1200 is 1000mm, 1100 is 1100mm, 1200 is 800mm, 1100 is 800mm, accord with national tray size standard of the people's republic of China, the light tray can meet the demand of the logistics transportation such as the container, etc. The present invention provides lightweight pallets, including but not limited to the above specifications. According to different requirements of customers on the tray, the light tray with different lengths and widths can be freely prepared. In addition, the height (panel thickness + leg height) of the lightweight pallet provided by the present invention is typically 140 mm. Of course, the height of the lightweight tray can be designed differently according to the customer's needs.

A method of making the lightweight pallet of claims 1-4 comprising the steps of:

s1, feeding the PMI foam material into a tray mold for shaping to obtain an integral tray;

s2, separating the whole tray from the tray mold, and drying to obtain a tray substrate;

s3, mixing the polyurea resin and the PBO fibers, and spraying the mixture on the surface of the tray substrate to form a uniform fiber coating, thereby obtaining the light tray.

And (3) feeding the PMI foam material into a tray die, and shaping the PMI foam material by using the tray die to obtain the integral tray. The tray die is flushed with water to separate the whole tray. Drying can remove the moisture on the surface. The polyurea resin and the PBO fiber are mixed and sprayed on the surface of the tray matrix, so that a fiber coating can be formed on the surface of the tray matrix, the lightweight tray is fireproof and corrosion-resistant, and the impact resistance of the lightweight tray is enhanced.

The PMI foam material is used as a main material to prepare the light pallet, so that the pallet base body is light in weight and strong in bearing capacity. Polyurea resin and PBO fiber materials are sprayed on the surface of the base body of the tray, so that the bearing capacity (limit load 2383kg) of the tray is further improved, and the tray is fireproof, corrosion-resistant, wear-resistant and strong in impact resistance. In addition, the polyurea resin and the PBO fiber materials wrapped on the surface of the volume of the tray are non-toxic and harmless, and have good environmental protection performance. The light tray has long service life, can be repeatedly used, can save resources and has energy saving property.

Further, the step S1 specifically includes:

the PMI foam material is sent into a tray mold with the temperature of 180-300 ℃ for shaping by utilizing water vapor with the pressure of 6-12 MPa, and the integral tray is obtained.

In the pressure and temperature ranges, the PMI foam material can be shaped in the tray die. The water vapor with the pressure of 6MPa-12MPa can send the PMI foam material into the tray mold without deviation, and can not cause environmental pollution.

Further, the step S2 specifically includes:

and (3) washing the tray die by using water with the pressure of 1-10 MPa to separate the whole tray from the tray die, and drying to obtain a tray matrix.

The integral tray can be quickly separated from the tray die by using high-pressure water. In the drying process, the moisture on the surface of the base body of the tray can be removed, and the subsequent operation is facilitated.

Further, the mass ratio of the polyurea resin to the PBO fibers is 1: (1-2).

Mixing the following components in a mass ratio of 1: the polyurea resin and the PBO fiber material in the step (1-2) are sprayed on the surface of the tray substrate, so that the bearing capacity of the light tray can be enhanced, the light tray is fireproof and corrosion-resistant, and can resist large impact force.

Compared with the prior art, the light tray provided by the invention comprises the panel and the support legs, wherein the panel and the support legs are mainly made of PMI foam materials, so that the light tray not only has the advantages of small mass (only half of the mass of the tray in the existing market), good pressure resistance and strong bearing capacity, but also can be damp-proof, waterproof and fireproof, and has good stability and long service life. The surfaces of the panel and the support legs are treated by polyurea resin and PBO fiber materials, so that the light tray is fireproof, corrosion-resistant, wear-resistant and strong in impact resistance. The raw materials for preparing the light tray are nontoxic, harmless and radiationless, so that the environment is not polluted. The light tray can be recycled as a raw material, the recycling rate is 100%, resources can be saved, and the cost can be reduced. Therefore, the light pallet provided by the invention has strong loading performance and has the advantages of environmental protection and energy saving.

According to the preparation method of the light tray, the PMI foam material is used as a main material to prepare the light tray, so that the tray base body is light in weight and strong in bearing capacity. Polyurea resin and PBO fiber materials are sprayed on the surface of the base body of the tray, so that the bearing capacity (limit load 2383kg) of the tray is further improved, and the tray is fireproof, corrosion-resistant, wear-resistant and strong in impact resistance. The light tray is integrally formed by pressing, is connected without nails, does not damage supported objects, and is safe and reliable. In addition, the polyurea resin and the PBO fiber materials wrapped on the surface of the volume of the tray are non-toxic and harmless, and have good environmental protection performance. The light tray has long service life, can be repeatedly used, can save resources and has energy saving property.

Drawings

FIG. 1 is a schematic front view of a lightweight pallet according to the present invention;

FIG. 2 is a schematic view of the bottom of a lightweight tray according to the present invention

In the drawings, the components represented by the respective reference numerals are listed below:

1. panel, 2, support leg, 3, groove, 4, cavity.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "center", "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

A light pallet comprises a panel 1 and support legs 2, wherein the support legs 2 are arranged at the bottom of the panel 1;

the support legs 2 are provided with a plurality of groups, each group of support legs 2 is arranged along the length direction of the panel 1, and in each group of support legs 2, the distance between every two adjacent support legs 2 is 280 mm;

preparation of the panel 1 and the foot 2 the raw materials PMI foam, polyurea resin and PBO fibers.

The light tray selects PMI foam material, polyurea resin and PBO fiber as raw materials, is nontoxic and harmless, and belongs to an environment-friendly product. The lightweight pallet is lightweight, half the weight of pallets used in existing markets. It can be moisture-proof, water-proof and fire-proof. Compared with a plastic tray, the light tray can be recycled as a raw material after being discarded, and the cost for manufacturing the light tray is greatly reduced. The light tray can be reused for many times, and is washed with water as new. The existing plastic tray is a hard plastic tray, is fragile and easy to age, has short service life, and pollutes the environment after being discarded. The light pallet provided by the invention has long service life and is wear-resistant. Finally, the light tray is integrally pressed and formed, has no other connection, cannot damage supported objects, and is safe and reliable.

In order to increase the friction between the article and the panel 1, the panel 1 is cuboid; the top of the panel 1 is provided with a groove 3; the two adjacent groups of legs 2 are equally spaced.

Preferably, a plurality of cavities 4 extending from the supporting legs 2 to the panel 1 are arranged on one side of each supporting leg 2 far away from the panel 1, the distance between two adjacent cavities 4 in each supporting leg 2 is equal, and the cavities 4 are in a triangular prism shape.

The cavities 4 are arranged inside the legs 2, which further reduces the weight of the lightweight pallet.

According to the load capacity and the cargo transportation requirement of the light pallet, and the lifting capacity of a forklift is considered at the same time, the length of the panel 1 of the light pallet provided by the invention is 1000mm, the width of the panel is 800mm, and the thickness of the panel is 40 mm; the height of the legs 2 is 80 mm.

The tray is prepared by the following steps:

s1, feeding the PMI foam material into a tray mold at 180 ℃ for shaping by using water vapor with the pressure of 6MPa to obtain an integral tray;

s2, washing the tray mold by water with the pressure of 1MPa to separate the whole tray from the tray mold, and drying to obtain a tray matrix;

s3, mixing polyurea resin and PBO fibers according to a mass ratio of 1: 1, spraying the mixture on the surface of a tray substrate to form a uniform fiber coating, and thus obtaining the light tray.

The weight of the lightweight tray was 9.54 kg. The fork lift experiment shows that the light pallet has the limit load of 2383kg, the loading flexibility value of 18mm and the residual flexibility value of 1 mm. Water absorption experiments prove that the light tray can prevent moisture and water. The fireproof test proves that the lightweight tray can prevent fire. Radioactivity test proves that the radioactivity of the product meets the national standard.

Example 2

the support legs 2 are provided with a plurality of groups, each group of support legs 2 is arranged along the length direction of the panel 1, and in each group of support legs 2, the distance between every two adjacent support legs 2 is 340 mm;

According to the loading capacity and the cargo transportation requirement of the light pallet, and the lifting capacity of a forklift is considered at the same time, the length of the panel 1 of the light pallet provided by the invention is 1200mm, the width of the panel is 1000mm, and the thickness of the panel is 50 mm; the height of the legs 2 is 90 mm.

The tray is prepared by the following steps:

s1, feeding the PMI foam material into a tray mold at 240 ℃ for shaping by using water vapor with the pressure of 9MPa to obtain an integral tray;

s2, washing the tray mold by using water with the pressure of 5MPa to separate the whole tray from the tray mold, and drying to obtain a tray substrate;

s3, mixing polyurea resin and PBO fibers according to a mass ratio of 1: 1.5, spraying the mixture on the surface of a tray substrate to form a uniform fiber coating, and thus obtaining the light tray.

The weight of the lightweight tray was 10.26 kg. The fork lift test shows that the light pallet has a limit load of 2239kg, a loaded deflection value of 17mm and a residual deflection value of 1.2 mm. Water absorption experiments prove that the light tray can prevent moisture and water. The fireproof test proves that the lightweight tray can prevent fire. Radioactivity test proves that the radioactivity of the product meets the national standard.

Example 3

the support legs 2 are provided with a plurality of groups, each group of support legs 2 is arranged along the length direction of the panel 1, and in each group of support legs 2, the distance between every two adjacent support legs 2 is 400 mm;

According to the load capacity and the cargo transportation requirement of the light pallet, and the lifting capacity of a forklift is considered at the same time, the length of the panel 1 of the light pallet provided by the invention is 1400mm, the width of the panel is 1200mm, and the thickness of the panel is 60 mm; the height of the legs 2 is 100 mm.

The tray is prepared by the following steps:

s1, feeding the PMI foam material into a tray mold at 300 ℃ for shaping by utilizing water vapor with the pressure of 12MPa to obtain an integral tray;

s2, washing the tray die by water with the pressure of 10MPa to separate the whole tray from the tray die, and drying to obtain a tray substrate;

s3, mixing polyurea resin and PBO fibers according to a mass ratio of 1: 2, after mixing, spraying the mixture on the surface of a tray substrate to form a uniform fiber coating, thus obtaining the light tray.

The weight of the lightweight tray was 10.92 kg. The fork lift experiment shows that the light pallet has a limit load of 2359kg, a loaded flexibility value of 18mm and a residual flexibility value of 1.5 mm. Water absorption experiments prove that the light tray can prevent moisture and water. The fireproof test proves that the lightweight tray can prevent fire. Radioactivity test proves that the radioactivity of the product meets the national standard.

Examples 1-3 show that the lightweight pallet provided by the invention has light weight and strong bearing capacity. The lightweight tray is moisture-proof, waterproof and fireproof, and is nontoxic, harmless and good in environmental protection performance. The light tray has long service life, can be repeatedly used, can save resources and has energy saving property. The preparation method of the light pallet provided by the invention utilizes nontoxic and harmless materials, and the prepared light pallet has the advantages of light weight, strong loading capacity, environmental protection and energy conservation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A lightweight pallet, characterized by comprising a panel (1) and legs (2), said legs (2) being arranged at the bottom of said panel (1);

the supporting legs (2) are provided with a plurality of groups, each group of supporting legs (2) is arranged along the length direction of the panel (1), and the distance between every two adjacent supporting legs (2) in each group of supporting legs (2) is equal;

the panel (1) and the support leg (2) are prepared from PMI foam materials, polyurea resin and PBO fibers.

2. The lightweight pallet according to claim 1,

the panel (1) is cuboid; the top of the panel (1) is provided with a groove (3);

the distance between two adjacent groups of the supporting feet (2) is equal.

3. The lightweight pallet according to claim 2, characterized in that the side of each leg (2) remote from the panel (1) is provided with a plurality of cavities (4) extending from the leg (2) towards the panel (1), wherein in each leg (2) two adjacent cavities (4) are equally spaced and the cavities (4) are triangular prism shaped.

4. The lightweight pallet according to claim 3,

the length of the panel (1) is 1000-1400mm, the width is 800-1200mm, and the thickness is 40-60 mm; the height of the supporting feet (2) is 80-100mm, and the distance between two adjacent supporting feet (2) in each group of supporting feet (2) is 280-400 mm.

5. A method for making a lightweight pallet according to claims 1-4 comprising the steps of:

6. The method for preparing a lightweight pallet according to claim 5, wherein the step S1 specifically comprises:

7. The method for preparing a lightweight pallet according to claim 5, wherein the step S2 specifically comprises:

8. The method for manufacturing a lightweight pallet according to any one of claims 5 to 7, wherein in step S3, the mass ratio of the polyurea resin and the PBO fibers is 1: (1-2).