Sample preparation device for food-grade packaging material

Abstract

The utility model discloses a sample preparation device for a food-grade packaging material, which comprises a base, a pressing plate and a punching plate, the pressing plate and the punching plate are matched with the base in a lifting manner, and the base is provided with a bearing surface for bearing a sample; the pressing plate is provided with two working positions; in the first working position, the sample is clamped between the pressing plate and the bearing surface; in the second working position, the pressing plate is separated from the bearing surface; a plurality of punching cutters are fixedly arranged on the punching plate, the cross section of each punching cutter is circular, and the area of each punching cutter is not smaller than one square decimeter; the pressing plate is provided with a through hole for the punching cutter to penetrate through. A gap for avoiding a cutting edge of the punching cutter is formed in the bearing surface; a driving assembly used for driving the punching plate to ascend and descend is arranged between the punching plate and the base. The sample preparation device for the food-grade packaging material is reasonable in structure, time-saving and labor-saving, and convenient and accurate in sample preparation.

Description

Technical Field

[0001] This utility model relates to the field of food-grade packaging testing technology, and in particular to a sample preparation device for food-grade packaging materials. Background Technology

[0002] Food-grade packaging materials, such as bags and plastic films, can release residual solvents, unpolymerized free monomers and degradation products of plastic products, as well as chemicals such as stabilizers, plasticizers, antioxidants, colorants, pesticides, and preservatives into food during contact with food. In severe cases, this can alter food composition, deteriorate food quality, affect taste, and ultimately endanger human health. Therefore, the safety principle for food-grade packaging materials requires that the amount of chemicals migrating from food packaging into food must not exceed safety limits.

[0003] Currently, to ensure material safety, it is necessary to test the total amount and specific migration amounts of chemicals that may migrate from materials used in food packaging into the packaged food. EU standards provide detailed specifications for testing methods, outlining various approaches for determining both total and specific migration amounts. One of the most important methods involves placing a food simulant or substitute in a one-sided migration chamber, where only the food-contact side of the packaging material comes into contact with the food simulant, thus conducting a one-sided migration test on the packaging material.

[0004] Before testing, the sample needs to be cut into the appropriate shape and size according to the sealing area dimensions of the migration chamber. It is usually necessary to cut it into a circle to ensure a good seal. Manual cutting is not only time-consuming and labor-intensive, but also cannot guarantee accuracy.

[0005] Therefore, it is necessary to improve the existing sampling devices for food-grade packaging materials. Utility Model Content

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a sample preparation device for food-grade packaging materials that is time-saving, labor-saving, convenient and accurate in sample preparation.

[0007] To achieve the above technical effects, the technical solution of this utility model is as follows: a sample preparation device for food-grade packaging materials, including a base, and a pressure plate and a cutting plate that are raised and lowered in cooperation with the base. The base is provided with a bearing surface for bearing the sample. The pressure plate has two working positions: in the first working position, the sample is clamped between the pressure plate and the bearing surface; in the second working position, the pressure plate is separated from the bearing surface. The cutting plate is fixedly provided with a plurality of cutting blades, the cross-section of which is circular and the area is not less than one square decimeter. The pressure plate is provided with through holes for the cutting blades to pass through. The bearing surface is provided with gaps to avoid the blades of the cutting blades. A driving assembly for driving the cutting plate to rise and fall is provided between the cutting plate and the base.

[0008] According to one embodiment of the present invention, the base is fixedly provided with a first guide post, the first guide post is vertically extended, and the pressure plate and the punching plate are slidably connected to the first guide post.

[0009] According to one embodiment of the present invention, the pressure plate is fixedly provided with a second guide post, the second guide post is vertically extended, the punching plate is provided with a sliding hole that is slidably connected to the second guide post; the end of the second guide post is fixedly provided with a protrusion that abuts against the upper surface of the punching plate.

[0010] According to one embodiment of the present invention, a compression spring is sandwiched between the upper surface of the pressure plate and the lower surface of the punching plate, and the compression spring is sleeved outside the second guide post.

[0011] According to one embodiment of the present invention, the punching cutter has two working positions: in the first working position, the cutting edge of the punching cutter is disposed in the through hole; in the second working position, the cutting edge of the punching cutter protrudes from the pressure plate and is confined in the gap.

[0012] According to one embodiment of the present invention, the pressure plate is fixedly provided with a protective protrusion, and in the second working position of the punching cutter, the protective protrusion abuts against the punching plate.

[0013] According to one embodiment of the present invention, the driving assembly includes a cylinder, the cylinder body of which is fixedly connected to the base, and the piston rod of which is fixedly connected to the punching plate.

[0014] The advantages and beneficial effects of this utility model are as follows: The sample preparation device for food-grade packaging materials of this utility model has a reasonable structure. By setting a base, a pressure plate, and a punching plate, and setting multiple punching blades on the punching plate, the pressure plate presses the sample on the base, the punching plate presses down, and the punching blades punch the sample into sample units that meet the requirements of the migration cell. Compared with the prior art, it not only has high sample preparation accuracy, but also can cut multiple sample units at one time for different experiments, saving time and effort. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the food-grade packaging material sample preparation device of this utility model (second working position of the pressure plate, first working position of the punching blade).

[0016] Figure 2 yes Figure 1 An explosion diagram;

[0017] Figure 3 yes Figure 1 A sectional view;

[0018] Figure 4 yes Figure 2 A sectional view;

[0019] Figure 5 This is a cross-sectional view of the first working position of the pressure plate and the first working position of the punching blade;

[0020] Figure 6 This is a cross-sectional view of the pressure plate in its first working position and the punching cutter in its second working position.

[0021] In the diagram: 1. Base; 11. Bearing surface; 12. Gap; 13. First guide post; 2. Pressure plate; 21. Through hole; 22. Second guide post; 23. Protrusion; 24. Protective protrusion; 25. Heat insulation layer; 3. Punching plate; 31. Sliding hole; 32. Mounting hole; 4. Punching blade; 41. Hot pressing ring; 5. Compression spring; 6. Heating rod; 7. Cylinder. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model. Example

[0023] like Figure 1-6As shown, the food-grade packaging material sample preparation device of the embodiment includes a base 1, a pressure plate 2 and a cutting plate 3 that are raised and lowered in cooperation with the base 1. The base 1 is provided with a bearing surface 11 for bearing the sample. The pressure plate 2 has two working positions: in the first working position, the sample is clamped between the pressure plate 2 and the bearing surface 11; in the second working position, the pressure plate 2 is separated from the bearing surface 11. The cutting plate 3 is fixedly provided with a plurality of cutting blades 4, the cross-section of the cutting blades 4 is circular and the area is not less than one square decimeter. The pressure plate 2 is provided with through holes 21 for the cutting blades 4 to pass through. The bearing surface 11 is provided with gaps 12 to avoid the blades of the cutting blades 4. A driving assembly for driving the cutting plate 3 to rise and fall is provided between the cutting plate 3 and the base 1.

[0024] With this design, the sample is placed on the bearing surface 11, and the pressure plate 2 presses down to cooperate with the bearing surface 11 to clamp and fix the sample. The punching plate 3 presses down to drive the punching blade 4 to complete the punching operation on the sample. Under the punching of the punching blade 4, the sample is punched into sample units that meet the requirements of the migration cell.

[0025] Specifically, the base 1 is fixedly provided with a first guide post 13, the first guide post 13 is vertically extended, and the pressure plate 2 and the punching plate 3 are slidably connected to the first guide post 13.

[0026] This design achieves the purpose of guiding the lifting of the pressure plate 2 and the punching plate 3.

[0027] Specifically, the pressure plate 2 is fixedly provided with a second guide post 22, the extension direction of the second guide post 22 is vertical, the punching plate 3 is provided with a sliding hole 31 that is slidably connected to the second guide post 22; the end of the second guide post 22 is fixedly provided with a protrusion 23 that abuts against the upper surface of the punching plate 3.

[0028] With this design, the pressure plate 2 is suspended on the punching plate 3 by the protrusion 23, thus preventing the pressure plate 2 from separating from the punching plate 3.

[0029] Specifically, a compression spring 5 is sandwiched between the upper surface of the pressure plate 2 and the lower surface of the punching plate 3, and the compression spring 5 is sleeved on the outside of the second guide post 22.

[0030] With this design, the compression spring 5 acts as a buffer for the punching plate 3 and can also reset the punching plate 3.

[0031] Specifically, the punching cutter 4 has two working positions: in the first working position, the cutting edge of the punching cutter 4 is disposed in the through hole 21; in the second working position, the cutting edge of the punching cutter 4 protrudes from the pressure plate 2 and is confined in the gap 12.

[0032] With this design, when the punching blade 4 is not in punching operation, its cutting edge is located in the through hole 21, avoiding the cutting edge being exposed and causing safety hazards.

[0033] Specifically, the pressure plate 2 is fixedly provided with a protective protrusion 24, and in the second working position of the punching cutter 4, the protective protrusion 24 is abutted against the punching plate 3.

[0034] This design protects the blade of the punching cutter 4. The punching plate 3 abuts against the protective protrusion 24, preventing the blade of the punching cutter 4 from impacting the bottom surface of the gap 12.

[0035] Furthermore, it also includes a heating rod 6, which is arranged in a one-to-one correspondence with the punching blade 4, and the heating rod 6 and the punching blade 4 are in face-to-face contact; the punching plate 3 is provided with mounting holes 32 for mounting the heating rod 6.

[0036] With this design, for packaging materials with strong toughness such as biodegradable bags, the use of cold cutting blades can lead to uneven cut surfaces and excessive blade wear. Therefore, it is necessary to heat the cutting blade 4. The heated cutting blade 4 is easier to cut fully biodegradable bags.

[0037] Specifically, the inner wall of the punching blade 4 is provided with a hot-pressing ring 41, and in the second working position of the punching blade 4, the sample unit is sandwiched between the hot-pressing ring 41 and the bearing surface 11.

[0038] With this design, the heating ring 41 can heat seal the outer periphery of the sample unit, reducing the exposure of the cut surface to chemical reagents.

[0039] Specifically, a heat insulation layer 25 is fixedly provided on the lower surface of the pressure plate 2.

[0040] This design avoids heating the entire sample unit, which could affect the test results.

[0041] Specifically, the drive assembly includes a cylinder 7, the cylinder body of which is fixedly connected to the base 1, and the piston rod of which is fixedly connected to the punching plate 3.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A sample preparation device for food-grade packaging materials, characterized in that, The system includes a base (1), a pressure plate (2) and a punching plate (3) that are raised and lowered in conjunction with the base (1). The base (1) is provided with a bearing surface (11) for bearing the sample. The pressure plate (2) has two working positions: in the first working position, the sample is clamped between the pressure plate (2) and the bearing surface (11); in the second working position, the pressure plate (2) is separated from the bearing surface (11). The punching plate (3) is fixedly provided with a plurality of punching blades (4). The cross-section of the punching blades (4) is circular and the area is not less than one square decimeter. The pressure plate (2) is provided with a through hole (21) for the punching blades (4) to pass through. The bearing surface (11) is provided with a gap (12) to avoid the blade of the punching blades (4). A drive assembly for driving the punching plate (3) to rise and fall is provided between the punching plate (3) and the base (1).

2. The sample preparation device for food-grade packaging materials according to claim 1, characterized in that, The base (1) is fixedly provided with a first guide post (13), the first guide post (13) is vertically extended, and the pressure plate (2) and the punching plate (3) are slidably connected to the first guide post (13).

3. The sample preparation device for food-grade packaging materials according to claim 2, characterized in that, The pressure plate (2) is fixedly provided with a second guide post (22), the extension direction of the second guide post (22) is vertical, and the punching plate (3) is provided with a sliding hole (31) that is slidably connected to the second guide post (22); the end of the second guide post (22) is fixedly provided with a protrusion (23) that abuts against the upper surface of the punching plate (3).

4. The sample preparation device for food-grade packaging materials according to claim 3, characterized in that, A compression spring (5) is sandwiched between the upper surface of the pressure plate (2) and the lower surface of the punching plate (3), and the compression spring (5) is sleeved on the outside of the second guide post (22).

5. The sample preparation device for food-grade packaging materials according to claim 1, characterized in that, The punching cutter (4) has two working positions: in the first working position, the cutting edge of the punching cutter (4) is located in the through hole (21); in the second working position, the cutting edge of the punching cutter (4) protrudes from the pressure plate (2) and is confined in the gap (12).

6. The sample preparation device for food-grade packaging materials according to claim 5, characterized in that, The pressure plate (2) is fixedly provided with a protective protrusion (24). In the second working position of the punching cutter (4), the protective protrusion (24) abuts against the punching plate (3).

7. The sample preparation device for food-grade packaging materials according to claim 1, characterized in that, The drive assembly includes a cylinder (7), the cylinder body of which is fixedly connected to the base (1), and the piston rod of which is fixedly connected to the punching plate (3).

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