Kraft paper bag sealing device

Abstract

The utility model discloses a kraft paper bag sealing device which comprises a fixed plate and a movable plate, an electric heating wire installation groove is formed in the fixed plate, a glass fiber plate is arranged in the electric heating wire installation groove, and an upper pressing strip containing cavity for containing an upper pressing strip and a lower pressing strip containing cavity for containing a lower pressing strip are arranged on the two sides of the glass fiber plate and in the electric heating wire installation groove. An electric heating wire is arranged on the glass fiber plate, and one end of the electric heating wire is connected with a spring; the upper pressing strip and the lower pressing strip are arranged on the movable plate, and a silica gel strip is arranged between the upper pressing strip and the lower pressing strip; the movable plate is connected with a power device and moves towards the fixed plate through the power device. The electric heating wire can be always in a tight state through the spring, bending deformation of the electric heating wire due to thermal expansion and cold contraction can be avoided, the sealing effect is improved, and the sealing device can be better suitable for sealing of narrow hot melt adhesive tapes.

Description

Technical Field

[0001] This utility model relates to the field of logistics parcel packaging technology, specifically to a kraft paper bag sealing device for packaging machines. Background Technology

[0002] Kraft paper bags are widely used in the packaging industry due to their environmental friendliness and durability. Common kraft paper bags have hot melt adhesive or hot melt adhesive strips at the opening, which are heated and pressed together to seal the bag.

[0003] For example, CN206218327U discloses a continuous roll plastic bag packaging machine. Its sealing device includes a fixed plate and a movable plate. Both the fixed and movable plates are equipped with heating elements for heat melting, specifically heating wires on the fixed plate and high-temperature resistant soft adhesive strips on the movable plate. The plastic bags conveyed by the conveying device hang downwards under gravity, positioned between the fixed and movable plates. When the movable plate moves towards the fixed plate via a cylinder, the heating elements on both plates heat-melt and seal the plastic bags. After sealing, the movable plate moves away from the fixed plate under the action of the cylinder. This sealing device can be used not only for sealing continuous roll plastic bags but also for sealing kraft paper bags; however, its sealing effect is poor and unsightly when used for kraft paper bags, and for narrower hot melt adhesive strips, leaks often occur. Utility Model Content

[0004] The purpose of this invention is to provide a kraft paper bag sealing device for packaging machines. This device is suitable for sealing narrow hot melt adhesive strips and is aesthetically pleasing and reliable.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is as follows:

[0006] A kraft paper bag sealing device includes a fixed plate and a movable plate. The fixed plate is provided with a heating wire mounting groove, and a fiberglass plate is placed in the heating wire mounting groove. On both sides of the fiberglass plate, an upper pressure strip receiving cavity for accommodating an upper pressure strip and a lower pressure strip receiving cavity for accommodating a lower pressure strip are provided in the heating wire mounting groove. A heating wire is provided on the fiberglass plate, and one end of the heating wire is connected to a spring. The upper and lower pressure strips are set on the movable plate, and a silicone strip is provided between the upper and lower pressure strips. The movable plate is connected to a power device, and the movable plate moves towards the fixed plate through the power device.

[0007] In use, the kraft paper bag is located between the fixed plate and the movable plate. The hot melt adhesive strip at the opening of the kraft paper bag is located between the heating wire and the silicone strip. The power unit drives the movable plate to move towards the fixed plate. The upper and lower pressure strips cooperate with the fiberglass plate to clamp the kraft paper bag. The heated heating wire cooperates with the silicone strip to seal the kraft paper bag.

[0008] The other end of the heating wire is connected to another spring. That is, springs are provided at both ends of the heating wire.

[0009] The power unit is a cylinder.

[0010] On one side of the fixed plate, the movable plate is provided with a first guide post, and on the other side of the fixed plate, the movable plate is provided with a second guide post.

[0011] This invention uses a spring to keep the heating wire taut at all times, which not only prevents the heating wire from bending and deforming due to thermal expansion and contraction, thus improving the sealing effect, but also makes it more suitable for sealing narrow hot melt adhesive strips.

[0012] This invention effectively prevents accidents caused by the heating wire, which is heated, from being placed inside a groove when not in operation. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the connection structure of the fixing plate of this utility model.

[0016] Figure 3 This is a schematic diagram of the fixing plate structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the connection structure of the movable plate of this utility model. Detailed Implementation

[0018] like Figure 1-4 As shown, the kraft paper bag sealing device includes a fixed plate 1 and a movable plate 4. Between the fixed plate 1 and the movable plate 4, a heating wire mounting groove 11 is provided on the end face of the fixed plate 1. A fiberglass plate 2 is provided in the heating wire mounting groove 11. Above the fiberglass plate 2, an upper pressure strip receiving cavity 51 for accommodating an upper pressure strip 5 is provided in the heating wire mounting groove 11. Below the fiberglass plate 2, a lower pressure strip receiving cavity 61 for accommodating a lower pressure strip 6 is provided in the heating wire mounting groove 11. A heating wire 3 is provided on the fiberglass plate 2. A left spring 31 is provided at the left end of the heating wire 3. One end of the left spring 31 is connected to the heating wire 3, and the other end is fixedly connected to the fiberglass plate 2. A right spring 32 is provided at the right end of the heating wire 3. One end of the right spring 32 is connected to the heating wire 3, and the other end is fixedly connected to the fiberglass plate 2. The left spring 31 and the right spring 32 keep the heating wire 3 in a taut state at all times.

[0019] Between the fixed plate 1 and the movable plate 4, an upper pressure strip 5 and a lower pressure strip 6 are provided on the end face of the movable plate 4, and a silicone strip 6 is provided between the upper pressure strip 5 and the lower pressure strip 6.

[0020] On one side of the fixed plate 1, the movable plate 4 is provided with a first guide post, and on the other side of the fixed plate 1, the movable plate 4 is provided with a second guide post. The movable plate 4 is connected to a cylinder, and the cylinder drives the movable plate 4 to move toward the fixed plate 1.

[0021] In use, the kraft paper bag is conveyed between the fixed plate 1 and the movable plate 4. The hot melt adhesive strip at the opening of the kraft paper bag is located between the heating wire 3 and the silicone strip 6. The cylinder drives the movable plate 4 to move towards the fixed plate 1, the upper pressure strip 5 enters the upper pressure strip receiving cavity 51, and the lower pressure strip 6 enters the lower pressure strip receiving cavity 61. The upper pressure strip 5 and the lower pressure strip 6 cooperate with the fiberglass plate 2 to clamp the kraft paper bag. The heated heating wire 3 cooperates with the silicone strip 6 to seal the kraft paper bag. After the kraft paper bag is sealed, the cylinder drives the movable plate 4 away from the fixed plate 1.

[0022] The above embodiments do not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A kraft paper bag sealing device, characterized in that: The device includes a fixed plate and a movable plate. The fixed plate has a heating wire mounting groove, and a fiberglass plate is installed in the heating wire mounting groove. On both sides of the fiberglass plate, the heating wire mounting groove has an upper pressure strip receiving cavity for accommodating an upper pressure strip and a lower pressure strip receiving cavity for accommodating a lower pressure strip. A heating wire is installed on the fiberglass plate, and one end of the heating wire is connected to a spring. The upper and lower pressure strips are mounted on the movable plate, and a silicone strip is installed between the upper and lower pressure strips. The movable plate is connected to a power device, and the movable plate moves towards the fixed plate through the power device.

2. The kraft paper bag sealing device according to claim 1, characterized in that: The other end of the heating wire is connected to another spring.

3. The kraft paper bag sealing device according to claim 1, characterized in that: The power unit is a cylinder.

4. The kraft paper bag sealing device according to claim 1, characterized in that: On one side of the fixed plate, the movable plate is provided with a first guide post, and on the other side of the fixed plate, the movable plate is provided with a second guide post.

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