Plastic end protection plate for steel coil packaging

Abstract

The invention relates to the technical field of packaging materials, in particular to a plastic end protection plate for steel coil packaging. The plastic end protection plate for steel coil packaging comprises a surface layer, a middle foaming layer and a bottom layer which are sequentially arranged from top to bottom. The surface layer, the middle layer and the bottom layer are made of PE plastic particles. The plastic end plate is convenient to process and easy to recycle, the weight of the plastic end plate is less than 10% of that of a steel wrapping plate under the condition of the same size, the rigidity of the plastic end plate meets the steel coil packaging requirement, the packaging protection effect is excellent, the plastic end plate can effectively help various large steel mills to solve the problem that large-diameter steel coils are difficult to package, and the plastic end plate has great market potential and value.

Description

Technical Field

[0001] The invention relates to the technical field of packaging materials, in particular to a plastic end guard plate for steel coil packaging. Background Art

[0002] End guards are one of the main materials for steel coil packaging. Their function is to prevent the end faces of steel coils from being damaged during hoisting and transportation. There are two main types: steel end guards and plastic end guards. Large-sized steel end guards are too heavy, which is not conducive to processing, transportation and packaging; large-sized plastic end guards have high processing equipment requirements and are too large in diameter, resulting in insufficient rigidity, which is not conducive to processing and packaging. At present, large-sized steel coils with a coil diameter of more than 1800mm are basically packaged in bare packages (without end guards) or fan-shaped steel end guards. Due to the lack of full coverage packaging protection at the ends of the steel coils, the end faces are easily damaged during hoisting and transportation of the steel coils. Major steel mills often receive quality objections to end damage from downstream users. Summary of the invention

[0003] The object of the present invention is to provide a plastic end guard plate for steel coil packaging, which can solve the problem that the large-sized steel end guard plates in the prior art are too heavy and not conducive to processing, transportation and packaging;

[0004] In order to solve this problem, a plastic end guard plate for large-size steel coil packaging is provided, which is easy to process, has a density lower than that of a steel cladding plate and has a rigidity that meets the requirements for steel coil packaging.

[0005] The present invention provides a plastic end guard plate for steel coil packaging, which comprises a surface layer, a middle foaming layer and a bottom layer arranged in sequence from top to bottom;

[0006] The raw materials for making the surface layer, the middle layer and the bottom layer include PE plastic particles.

[0007] Preferably, the intermediate foam layer accounts for more than 80% of the total thickness of the plastic end guard plate;

[0008] The surface layer and the bottom layer each account for 5-10% of the total thickness of the plastic end guard plate.

[0009] Preferably, the PE plastic particles are HDPE and LDPE.

[0010] Preferably, the HDPE melt index is controlled between 1-2.

[0011] Preferably, the surface layer is a non-foamed color-adjusting layer, and the weight ratio of HDPE, LDPE and masterbatch is 5-50:95-50:0.5-2.

[0012] Preferably, the weight ratio of HDPE, LDPE and physical foaming agent in the middle foaming layer is 80-95:5-20:0.5-1.

[0013] Preferably, the bottom layer is a bending-resistant layer, and the weight ratio of HDPE to LDPE is 80-100:0-20.

[0014] Preferably, the plastic end guard plate is manufactured by three-layer co-extrusion technology and three-roll calendering technology.

[0015] Preferably, the plasticizing temperature of the three-layer co-extrusion screw is controlled between 165-190°C, and the temperature of the extrusion die is controlled between 180-195°C.

[0016] Preferably, the cooling temperature of the three-roll calendering is controlled between 60-90°C, and the temperature difference of the three rollers should be controlled within 15°C.

[0017] Beneficial effects:

[0018] This plastic end plate is easy to process and easy to recycle. Under the condition of the same size, its weight is less than 10% of the steel cladding plate, and its rigidity meets the requirements of steel coil packaging. It has excellent packaging protection effect and can effectively help major steel mills solve the difficulties in packaging large-diameter steel coils. It has great market potential and value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the layered structure of a plastic end guard plate for steel coil packaging provided in a specific embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of a plastic end guard plate for steel coil packaging provided in a specific embodiment of the present invention (the dotted line in the figure represents the printing area, and the actual product does not have this dotted line).

[0022] Description of reference numerals:

[0023] 1: middle foaming layer, 2: surface layer, 3: bottom layer, 4: outer ring, 5: printing area, 6: inner ring. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 As shown, this embodiment provides a plastic end guard plate for steel coil packaging, which is suitable for large-size steel coil packaging. The requirements for steel coil packaging are: bending strength ≥12MPa, simply supported beam impact strength ≥18KJ / m2, and elongation at break ≥200%.

[0028] The plastic end guard plate comprises a middle foam layer 1, a surface layer 2 and a bottom layer 3.

[0029] The raw materials for making the middle foaming layer 1, the surface layer 2 and the bottom layer 3 include PE plastic particles. This plastic end plate is easy to process and easy to recycle. Under the condition of the same size, its weight is less than 10% of the steel cladding plate, and its rigidity meets the requirements of steel coil packaging. It has excellent packaging protection effect and can effectively help major steel mills solve the problem of difficult packaging of large-diameter steel coils. It has great market potential and value.

[0030] The plastic end guard plate is made of PE plastic particles, with a certain proportion of physical foaming agent and masterbatch added. The square plastic substrate is extruded through a three-layer co-extrusion and three-roll calendering process. The plastic substrate is then rounded and printed to produce a plastic end guard plate that meets the requirements of large-size steel coil packaging.

[0031] PE plastic particles are HDPE and LDPE.

[0032] The HDPE melt index is controlled between 1-2 to ensure the rigidity and extrusion stability of the plastic end guard.

[0033] The surface layer 2 is a non-foaming color-adjusting layer. To ensure the smoothness, appearance color and flexibility of the surface layer, the weight ratio of HDPE, LDPE and masterbatch is 5-50:95-50:0.5-2.

[0034] To ensure the foaming rate and product rigidity, the weight ratio of HDPE, LDPE and physical foaming agent in the middle foaming layer is 80-95:5-20:0.5-1.

[0035] The bottom layer 3 is a bending-resistant layer, and the weight ratio of HDPE to LDPE is 80-100:0-20.

[0036] The plastic end guard plate is made by three-layer co-extrusion technology and three-roll calendering technology.

[0037] The plasticizing temperature of the three-layer co-extrusion screw is controlled between 165-190°C, and the extrusion die temperature is controlled between 180-195°C.

[0038] The cooling temperature of the three-roll calendering should be controlled between 60-90℃, and the temperature difference of the three rollers should be controlled within 15℃.

[0039] Plastic end guards for packaging large-size steel coils can be customized according to requirements, with a total thickness of 1.6-3mm.

[0040] The middle foaming layer 1 accounts for more than 80% of the total thickness, and the foaming density of the middle foaming layer is 500-850 kg / m 3 The surface layer 2 and the bottom layer 3 each account for 5-10% of the total thickness.

[0041] As attached Figure 2 As shown, the plastic end guard plate for packaging provided by the present invention is a circular ring structure, which also includes an outer ring 4, a printing area 5 and an inner ring 6.

[0042] The dimensions of the outer ring 4 and the inner ring 6 can be customized according to requirements. The minimum inner diameter 3 of the inner ring 4 is φ300mm, and the maximum outer diameter of the outer ring 6 is 2150mm.

[0043] The printed content, font, color, etc. of the printed area 5 can be customized according to customer requirements. Furthermore, the printed area 5 needs to be concentrically arranged on the plastic end guard plate ring.

[0044] The specific implementation of the plastic end guard is shown below:

[0045] Example 1: The total thickness of the product is 2.0mm, the outer diameter of the plastic ring is 1850mm, and the inner diameter of the plastic ring is 610mm. It can be used to package steel coils with an inner diameter of 610mm and an outer diameter of 1800-1850mm.

[0046] Example 2: The total thickness of the product is 2.2mm, the outer diameter of the plastic ring is 2150mm, and the inner diameter of the plastic ring is 610mm. It can be used to package steel coils with an inner diameter of 610mm and an outer diameter of 2100-2150mm.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plastic end guard plate for steel coil packaging, characterized in that: It includes a surface layer, a middle foaming layer and a bottom layer which are arranged in sequence from top to bottom; The raw materials for making the surface layer, the middle layer and the bottom layer include PE plastic particles.

2. The plastic end guard plate for steel coil packaging according to claim 1, characterized in that: The intermediate foaming layer accounts for more than 80% of the total thickness of the plastic end guard plate; The surface layer and the bottom layer each account for 5-10% of the total thickness of the plastic end guard plate.

3. The plastic end guard plate for steel coil packaging according to claim 1, characterized in that: The PE plastic particles are HDPE and LDPE.

4. The plastic end guard plate for steel coil packaging according to claim 3, characterized in that: The HDPE melt index is controlled between 1-2.

5. The plastic end guard plate for steel coil packaging according to claim 3, characterized in that: The surface layer is a non-foaming color-adjusting layer, and the weight ratio of HDPE, LDPE and masterbatch is 5-50:95-50:0.5-2.

6. The plastic end guard plate for steel coil packaging according to claim 3, characterized in that: The weight ratio of HDPE, LDPE and physical foaming agent in the middle foaming layer is 80-95:5-20:0.5-1.

7. The plastic end guard plate for steel coil packaging according to claim 3, characterized in that: The bottom layer is a bending-resistant layer, and the weight ratio of HDPE to LDPE is 80-100:0-20.

8. The plastic end guard for steel coil packaging according to claim 1, characterized in that: The plastic end guard plate is made by three-layer co-extrusion technology and three-roll calendering technology.

9. The plastic end guard plate for steel coil packaging according to claim 8, characterized in that: The plasticizing temperature of the three-layer co-extrusion screw is controlled between 165-190°C, and the extrusion die temperature is controlled between 180-195°C.

10. The plastic end guard plate for steel coil packaging according to claim 8, characterized in that: The cooling temperature of the three-roll calendering should be controlled between 60-90℃, and the temperature difference of the three rollers should be controlled within 15℃.

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