Degradable packaging cast film blown film device

Abstract

The utility model discloses a degradable packing cast film blow film device, including the material cylinder, the material cylinder's discharge end connects the extrusion head, and the extrusion head's discharge port connects the blow molding head, and the blow molding head front end cavity is provided with the flow uniformity board, and the blow molding head lateral wall is through and is uniformly arranged with a plurality of air passages, and the air passage outer end is connected with the branch pipe, and the branch pipe other end is connected with the ring pipe, and the ring pipe cover is set up on the material cylinder, and the heating wire is wound and is arranged on the ring pipe, which has the advantages of simple structure, reasonable design, novel and unique thought, plastic fluid is sequentially entered into the extrusion hole and the material cavity along with pressure delivery, the plastic liquid is heated in the extrusion head by the heating ring, the normal flow of plastic fluid is guaranteed, the solidification of plastic fluid due to temperature loss is avoided, the plastic fluid is evenly shunted into the material channel, is finally gathered in the material ring, and the gas is evenly sprayed from the hole on the flow uniformity board by the external gas source, and the plastic fluid is blown to blow out the film.

Description

Technical Field

[0001] This utility model relates to the field of new materials technology, and in particular to a biodegradable packaging cast film blowing device. Background Technology

[0002] Vacuum skin packaging has become a new favorite in the flexible packaging industry, replacing composite heat-sealing packaging films in many fields. This method, applied in recent years to high-end aquatic products, steaks, and other products, involves covering the product with a heat-sealed plastic film. The negative pressure created by vacuuming adheres the film tightly to the product with minimal wrinkles, achieving a skin-feel effect.

[0003] Currently, commercially available heat-sealable cast film for packaging is difficult to degrade, and its processing suffers from problems such as difficulty in blow molding, easy tearing of the blown film, and uneven thickness. Therefore, those skilled in the art urgently need to develop a blown film device for biodegradable cast film for packaging. Utility Model Content

[0004] The purpose of this invention is to address existing problems by providing a biodegradable packaging cast film blowing device.

[0005] This utility model is achieved through the following technical solution:

[0006] A biodegradable packaging cast film blowing device includes a barrel, the discharge end of which is connected to an extrusion head, the discharge port of which is connected to a blow molding head, a flow equalization plate is provided in the front cavity of the blow molding head, and a plurality of air channels are provided through and evenly distributed on the side wall of the blow molding head, the outer end of the air channels is connected to a branch pipe, the other end of the branch pipe is connected to a ring pipe, the ring pipe is sleeved on the barrel, and a heating wire is wound on the ring pipe.

[0007] As a further improvement to the above solution, the flow equalization plate is disposed on the outer side of the inner end of the airway.

[0008] This ensures that the gas ejected from the inner end of the air passage is ejected from the holes of the flow equalizer, and that the gas is evenly distributed through the evenly distributed holes, thus achieving the purpose of uniform blow molding thickness.

[0009] As a further improvement to the above solution, the outer side of the flow equalization plate is snapped into the slot by a snap ring. The slot is set on the inner wall of the front cavity of the blow molding head. A spring is set on the inner side of the flow equalization plate and is set in the front cavity of the blow molding head.

[0010] The flow equalizer is prevented from falling off due to gas impact by the slot, and a spring acts on the inside of the flow equalizer, which, together with the retaining spring, fixes the flow equalizer to ensure that it is always in a fixed state.

[0011] As a further improvement to the above solution, several material channels are evenly distributed on the side wall of the blow molding head, the rear end of the material channel is connected to the material cavity of the extrusion head, and a material receiving ring is provided at the front end of the material channel, which is located on the front end face of the blow molding head.

[0012] The plastic fluid is temporarily stored in the material chamber to ensure that there is sufficient margin for the plastic fluid to be evenly distributed into the material channel. Then, it is gathered in the material ring through multiple material channels to ensure that the blown plastic film is a one-piece structure and avoid defects such as cracks.

[0013] As a further improvement to the above solution, several heating coils are spaced apart on the extrusion head; the heating coils generate heat to ensure that the molten fluid inside the extrusion head remains fluid and to prevent the fluid from cooling down and solidifying.

[0014] As a further improvement to the above solution, the extrusion head is provided with concentric extrusion holes, the front end of the extrusion holes is connected to the material chamber, and the material chamber is located at the front end of the extrusion head.

[0015] After the hot-melted fluid material is displaced from the barrel, it flows into the material cavity through the extrusion orifice of the extruder head, and then enters the material channel of the blow molding head evenly, where it is gathered by the material ring.

[0016] Compared with the prior art, this utility model has the following advantages: it has a simple structure, reasonable design, and novel and unique concept. The plastic fluid conveyed by the barrel under pressure enters the extrusion hole and the material chamber in sequence. The plastic liquid is heated by the heating coil in the extrusion head to ensure the normal flow of the plastic fluid and prevent the plastic fluid from cooling down and solidifying. The plastic fluid is evenly distributed into the material channel and finally converges in the material ring. Then, the gas is evenly sprayed from the holes on the flow equalization plate by an external air source to blow air onto the plastic fluid, so that it blows out a film. In addition, the blown gas is heated by the heating wire on the ring tube to ensure that the gas blown from the flow equalization plate has a heating effect on the plastic blown film, and avoids the plastic fluid from being affected by the cooling of the fluid during the blown film process. It has the advantages of uniform blown film thickness and reliable blown film. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of a gas pipeline.

[0019] Figure 3 This is a schematic diagram of the half-section installation structure of the blow molding head. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figures 1 to 3As shown, a biodegradable packaging cast film blowing device includes a material cylinder 1, the discharge end of the material cylinder 1 is connected to an extrusion head 2, the discharge port of the extrusion head 2 is connected to a blow molding head 4, a flow equalization plate 5 is provided in the front cavity of the blow molding head 4, and a plurality of air channels 43 are provided through and evenly distributed on the side wall of the blow molding head 4. The outer end of the air channel 43 is connected to the threaded joint 61 of the branch pipe 6, and the other end of the branch pipe 6 is connected to the ring pipe 7. The ring pipe 7 is sleeved on the material cylinder 1, and a heating wire 9 is wound on the ring pipe 7.

[0022] As a further improvement to the above scheme, the flow equalization plate 5 is disposed on the outer side of the inner end of the air passage 43.

[0023] The gas ejected from the inner end of the air passage 43 is ejected from the hole in the flow equalizer 5, and the gas is evenly distributed through the evenly distributed holes, so as to achieve the purpose of uniform blow molding thickness.

[0024] As a further improvement to the above solution, the outer side of the flow equalization plate 5 is snapped into the slot 52 by a snap ring 51. The slot 52 is set on the inner wall of the front cavity of the blow molding head 4. A spring 54 is set on the inner side of the flow equalization plate 5. The spring 54 is set in the front cavity of the blow molding head 4.

[0025] The slot 52 prevents the flow equalizer 5 from falling off due to the impact of the gas. In addition, the spring 54 acts on the inner side of the flow equalizer 5 and works with the retaining spring 51 to fix the flow equalizer 5, ensuring that the flow equalizer 5 is always in a fixed state.

[0026] As a further improvement to the above solution, a plurality of material channels 41 are evenly distributed on the side wall of the blow molding head 4. The rear end of the material channel 41 is connected to the material cavity 22 of the extrusion head 2. A material receiving ring 42 is provided at the front end of the material channel 41. The material receiving ring 42 is provided on the front end surface of the blow molding head 4.

[0027] The plastic fluid is temporarily stored in the material chamber 22 to ensure that there is sufficient margin for the plastic fluid to be evenly distributed into the material channel 41. Then, it is gathered in the material ring 42 through multiple material channels 41 to ensure that the blown plastic film is a one-piece structure and avoid defects such as cracks.

[0028] As a further improvement to the above scheme, several heating coils 3 are spaced together on the extrusion head 2; the heating coils 3 generate heat to ensure that the hot molten fluid in the extrusion head 2 has fluidity and to prevent the fluid from cooling down and solidifying.

[0029] As a further improvement to the above solution, the extrusion head 2 is provided with concentric extrusion holes 21, the front end of the extrusion holes 21 is connected to the material chamber 22, and the material chamber 22 is located at the front end of the extrusion head 2.

[0030] After the hot-melted fluid material is displaced from the barrel 1, it flows from the extrusion hole 21 of the extrusion head 2 into the material cavity 22, and then enters the material channel 41 of the blow molding head 4 evenly, and converges through the material ring 42.

[0031] The working principle of a biodegradable packaging cast film blowing device: Plastic fluid conveyed by pressure through the material cylinder 1 enters the extrusion hole 21 and the material chamber 22 in sequence. The plastic liquid is heated by the heating coil 3 in the extrusion head 2 to ensure normal flow of the plastic fluid and prevent the plastic fluid from cooling down and solidifying. The plastic fluid is evenly distributed into the material channel 41 and finally converges into the material ring 42. Then, the gas is connected to the pipe joint 81 at the outer end of the main pipe 8 by an external air source. The gas flows into the ring pipe 7 and is heated by the heating wire 9, so that the gas in the ring pipe 7 has a temperature. The gas is then evenly sprayed out through the branch pipe 6, the air channel 43, and the hole on the flow equalization plate 5 to blow air onto the plastic fluid, so that it blows out a film. In addition, the blown gas is heated by the heating wire 9 on the ring pipe to ensure that the gas blown out of the flow equalization plate 5 has a heating effect on the plastic blown film and prevents the plastic fluid from cooling down during the blowing process, which would affect the blowing.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A biodegradable packaging cast film blowing device, comprising a material cylinder, characterized in that, The discharge end of the barrel is connected to the extrusion head, the discharge port of the extrusion head is connected to the blow molding head, a flow equalization plate is provided in the front cavity of the blow molding head, and several air channels are provided through and evenly distributed on the side wall of the blow molding head. The outer end of the air channel is connected to the branch pipe, and the other end of the branch pipe is connected to the ring pipe. The ring pipe is sleeved on the barrel, and a heating wire is wound on the ring pipe.

2. The biodegradable packaging cast film blowing device according to claim 1, characterized in that, The flow equalization plate is located on the outer side of the inner end of the airway.

3. The biodegradable packaging cast film blowing device according to claim 1, characterized in that, The flow equalizer is snapped into a slot by a snap ring on the outside. The slot is located on the inner wall of the front cavity of the blow molding head. A spring is installed on the inner side of the flow equalizer and is located in the front cavity of the blow molding head.

4. The biodegradable packaging cast film blowing device according to claim 1, characterized in that, The blow molding head has several material channels evenly distributed on its sidewall. The rear end of the material channel is connected to the material cavity of the extrusion head, and the front end of the material channel is provided with a material receiving ring, which is located on the front end face of the blow molding head.

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