Die head of packaging bag film blowing machine

Abstract

The utility model relates to the technical field of film blowing machines, in particular to a die head of a packaging bag film blowing machine, which comprises a main body, a flow guide cone, a mounting seat and a circular ring, a channel is arranged in the center of the main body, a die core is arranged in the channel, a gap is reserved between the die core and the channel to form a runner for materials to pass through, and an air outlet is arranged in the center of the die core. The side face of the body is provided with an air inlet pipe communicated with external air blowing equipment, the air inlet pipe is communicated with the air outlet, the installation base is located at the bottom end of the body, a cavity is formed in the installation base, a filter plate is installed at the bottom of the installation base, a through hole for materials to pass through is formed in the filter plate, and the circular ring is arranged on the annular groove in a sleeving mode and can rotate to form a rotating pair with the mold core. By arranging the circular ring capable of rotating in the runner, the materials are utilized to push the blades to rotate the circular ring, the materials can be driven to be uniform, the bagging quality is uniform, meanwhile, the blades can crush lumps in the materials, the thickness of a packaging bag is stable, and the thickness of the packaging bag is prevented from being uneven.

Description

Technical Field

[0001] This utility model relates to the field of blown film machines, and in particular to a die head for a blown film machine for packaging bags. Background Technology

[0002] Blown film is widely used in the production of packaging bags in existing technologies. It involves heating plastic material to melt and then extruding it into a tubular shape. High-pressure air is used to inflate the film bubble to the required thickness. After the film cools and sets, the desired packaging bag can be obtained.

[0003] The production of packaging bags using blown film machines often results in uneven bag thickness. This is mainly due to two reasons: first, the material, although in a molten state, is not uniformly stirred; second, the material contains broken clumps, leading to uneven distribution. This uneven material, after being extruded and blown through the flow channel, cannot form a regular bag film, resulting in uneven bag thickness. The purpose of this invention is to propose a new blown film machine die to solve these technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a die head for a packaging bag blown film machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a main body, a guide cone, a mounting base, and a ring. A channel is formed at the center of the main body, and a mold core is installed within the channel. A gap exists between the mold core and the channel, forming a flow channel for material passage. An air outlet is formed at the center of the mold core. An air inlet pipe, connected to an external blower, is provided on the side of the main body. The air inlet pipe is connected to the air outlet. The guide cone is located within the channel and installed at the bottom of the mold core. The guide cone is inverted. The mounting base is located at the bottom of the main body, and a cavity is formed inside the mounting base. The mounting base surrounds the guide cone, placing it within the cavity. A feed hole, connected to the flow channel, is formed on the mounting base. A filter plate is installed at the bottom of the mounting base, and a through hole is formed on the filter plate for material passage. An annular groove is formed on the side of the mold core. The ring is fitted onto the annular groove and can rotate, forming a rotating pair with the mold core. Inclined blades are evenly distributed on the side of the ring, and these blades can be pushed by the material.

[0006] To optimize the above technical solution, the following measures are further taken: the cavity is in the shape of a frustum with a larger upper part and a smaller lower part. The structure design of the larger upper part and the smaller lower part facilitates the collection of materials, so that the materials are concentrated and enter the flow channel from the feed hole.

[0007] As a further improvement to the above technical solution: the feed holes are distributed in a ring shape to match the shape of the flow channel, ensuring that the material leaving the feed holes can quickly enter the flow channel and be squeezed and shaped.

[0008] As a further improvement to the technical solution: several rings are distributed along the height direction of the mold core to ensure that the rings can extrude materials at different heights in the flow channel in stages during rotation.

[0009] As an improvement to the aforementioned technical solution: along the height direction of the mold core from bottom to top, the length of the blades on different rings changes from long to short and then from short to long. Through the regular changes in the blades, the material is squeezed, which promotes the material to be mixed evenly and crushes the large particles contained in the material.

[0010] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages:

[0011] The present invention provides a die head for a blown film extrusion machine for packaging bags. By setting a ring that can rotate in the flow channel, the material pushes the blades to make the ring rotate, which can drive the material to be uniform and ensure the uniformity of the bag quality. At the same time, the blades can also crush clumps in the material to ensure the stability of the packaging bag thickness and avoid uneven packaging bag thickness. Attached Figure Description

[0012] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0015] Figure 3 for Figure 2 Enlarged detail image;

[0016] In the diagram: Main body-1, Channel-101, Mold core-102, Flow channel-103, Air outlet-104, Air inlet pipe-105, Guide cone-2, Mounting base-3, Cavity-301, Feed hole-302, Filter plate-303, Through hole-304, Ring-4, Annular groove-401, Blade-402 Detailed Implementation

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example

[0019] Please see Figure 1-3 This utility model provides a die head for a packaging bag blown film machine, including a main body 1, a guide cone 2, a mounting base 3 and a ring 4. The main body 1 has a channel 101 in the center, and a die core 102 is provided in the channel 101. There is a gap between the die core 102 and the channel 101 to form a flow channel 103 for material to pass through. The die core 102 has an air outlet 104 in the center. The side of the main body 1 is provided with an air inlet pipe 105 that communicates with an external blower. The air inlet pipe 105 is connected to the air outlet 104.

[0020] The guide cone 2 is located inside the channel 101 and installed at the bottom of the mold core 102. The guide cone 2 is in an inverted position.

[0021] The mounting base 3 is located at the bottom of the main body 1 and has a cavity 301 inside. The cavity 301 is a frustum shape with a larger top and a smaller bottom. The mounting base 3 surrounds the guide cone 2 so that the guide cone 2 is located inside the cavity 301. The mounting base 3 has a feed hole 302 that communicates with the flow channel 103. A filter plate 303 is installed at the bottom of the mounting base 3. The filter plate 303 has through holes 304 for material to pass through. The feed holes 302 are distributed in a ring shape and match the shape of the flow channel 103.

[0022] The mold core 102 has an annular groove 401 on its side. The ring 4 is fitted on the annular groove 401 and can rotate to form a rotating pair with the mold core 102. Several rings 4 are distributed along the height direction of the mold core 102. Inclined blades 402 are distributed at equal intervals on the side of the rings 4. The blades 402 can be pushed by the material. Along the height direction of the mold core 102 from bottom to top, the length of the blades 402 on different rings 4 changes from long to short and then from short to long.

[0023] Working principle: The material enters the cavity 301 through the through hole 304 on the filter plate 303. Affected by the guide cone 2, the material enters the flow channel 103 through the feed hole 302 and finally leaves from the end of the flow channel 103. It is squeezed and molded into a membrane bubble by the flow channel 103. Air enters the mold core 102 through the air inlet pipe 105 and finally leaves from the air outlet 104. The air expands the membrane bubble to form a bag-shaped film and cools the bag-shaped film to make its structure stable.

[0024] When the material is conveyed in the flow channel 103, the blades 402 can be pushed to make the ring 4 rotate in the cavity of the flow channel 103. During the rotation, the blades 402 of different specifications can drive the material to be fully mixed and squeeze the clumps in the material, thereby improving the uniformity of the material and avoiding uneven material thickness.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A die head for a blown film extrusion machine for packaging bags, characterized in that, include: The main body (1) has a channel (101) in the center, a mold core (102) is provided in the channel (101), there is a gap between the mold core (102) and the channel (101) to form a flow channel (103) for material to pass through, an air outlet (104) is provided in the center of the mold core (102), and an air inlet pipe (105) connected to an external blower is provided on the side of the main body (1), the air inlet pipe (105) is connected to the air outlet (104); The guide cone (2) is located inside the channel (101) and installed at the bottom of the mold core (102). The guide cone (2) is in an inverted position. Mounting base (3), the mounting base (3) is located at the bottom of the main body (1) and a cavity (301) is formed inside the mounting base (3). The mounting base (3) surrounds the guide cone (2) so that the guide cone (2) is located in the cavity (301) and a feed hole (302) communicating with the flow channel (103) is formed on the mounting base (3). A filter plate (303) is installed at the bottom of the mounting base (3) and a through hole (304) for material to pass through is formed on the filter plate (303). The ring (4) and the mold core (102) have an annular groove (401) on their side. The ring (4) is fitted on the annular groove (401) and can rotate to form a rotating pair with the mold core (102). Inclined blades (402) are evenly distributed on the side of the ring (4). The blades (402) can be pushed by the material.

2. The die head of a blown film extrusion machine for packaging bags according to claim 1, characterized in that: The cavity (301) is shaped like a frustum, wider at the top and narrower at the bottom.

3. The die head of a blown film extrusion machine for packaging bags according to claim 1, characterized in that: The feed holes (302) are arranged in a ring shape to match the shape of the flow channel (103).

4. The die head of a blown film extrusion machine for packaging bags according to any one of claims 1-3, characterized in that: Several rings (4) are distributed along the height direction of the mold core (102).

5. The die head of a blown film extrusion machine for packaging bags according to claim 4, characterized in that: Along the height direction of the mold core (102) from bottom to top, the length of the blades (402) on different rings (4) changes from long to short and then from short to long.

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