Degradable plastic bag film blowing device

Abstract

The utility model discloses a degradable plastic bag film blowing device and relates to the technical field of film blowing machines. The degradable plastic bag film blowing device comprises a plastic blank base, a plastic blank cavity is formed in the plastic blank base, an opening is formed in the upper end of the plastic blank cavity, the degradable plastic bag film blowing device further comprises a supporting shaft which is fixedly connected to the plastic blank base and is coaxial with the plastic blank cavity, two limiting discs are fixedly connected to the supporting shaft, and the limiting discs are fixedly connected to the supporting shaft. An air bag column is fixedly mounted between the two limiting discs; compared with a traditional air injection film blowing mode, the air bag film blowing mode is adopted, blowing force can be applied to a pipe blank more evenly, the thickness uniformity and size precision of a film are improved, degradable plastic bags more stable in quality can be produced, the expanded air bag columns can support the film in the film blowing process, and the film blowing efficiency is improved. The shaking of the film is effectively prevented, the quality problems of wrinkles, uneven thickness and the like caused by shaking are reduced, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of film blowing machine, concretely relates to degradable plastic bag film blowing device. BACKGROUND

[0002] With the continuous enhancement of global environmental protection consciousness, degradable plastic products gradually become important substitutes of traditional plastics and are widely applied in many fields.

[0003] As common packaging articles in daily life, the optimization and innovation of the production technology of degradable plastic bags are particularly crucial.

[0004] At present, the traditional degradable plastic bag film blowing machine mostly adopts the air blowing film blowing mode, that is, the pipe blank is inflated to form a film by injecting high-pressure gas into the extruded pipe blank, however, the air blowing film blowing mode has some deficiencies, in the film blowing process, the film is prone to shaking due to unstable airflow and other factors, which not only causes uneven film thickness and difficult size precision control, but also affects the appearance quality of the film, such as wrinkle, thereby reducing the product quality, in view of this, the utility model is proposed. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a degradable plastic bag film blowing device that can overcome the above problems or at least partially solve the above problems.

[0006] To solve the above technical problems, the basic idea of the technical scheme of the utility model is:

[0007] The degradable plastic bag film blowing device comprises a plastic blank base, a plastic blank cavity is formed in the plastic blank base, the upper end of the plastic blank cavity is provided in an open manner, further comprising: a supporting shaft fixedly connected to the plastic blank base and coaxially arranged with the plastic blank cavity, wherein two limiting discs are fixedly connected to the supporting shaft, a gas bag column is fixedly installed between the two limiting discs, a gas conveying cavity penetrating through the plastic blank base is formed in the supporting shaft, and an inflation hole in communication with the gas conveying cavity and the gas bag column is formed in the supporting shaft; an inflation pipe is arranged on the plastic blank base and in communication with the gas conveying cavity; and a material conveying mechanism is arranged on the plastic blank base and used for conveying raw materials into the plastic blank cavity.

[0008] Preferably, the material conveying mechanism comprises a feeding pump, a first material conveying pipe and a second material conveying pipe, the feeding pump is fixedly installed on the plastic blank base, the first material conveying pipe is in communication with the input end of the feeding pump, the feeding pump is in communication with a raw material hot melting tank through the first material conveying pipe, the second material conveying pipe is in communication with the output end of the feeding pump, and the feeding pump is in communication with the plastic blank cavity through the second material conveying pipe.

[0009] Preferably, a booster pump is fixedly installed on the plastic parison base, and the inflation pipe is communicated with an output end of the booster pump.

[0010] In order to cool the tube blank after being blown into a plastic bag, further, an annular sleeve is sleeved on the upper end of the air bag column, the annular sleeve is fixedly connected with the plastic parison base through a supporting rod, a hollow cavity is formed on the annular sleeve, a plurality of air injection holes are equidistantly formed on the inner side wall of the annular sleeve and communicated with the hollow cavity, a branch pipe is arranged on the annular sleeve and communicated with the hollow cavity, and an end of the branch pipe away from the hollow cavity is communicated with the inflation pipe.

[0011] In order to control the opening and closing of the inflation pipe, further, an electromagnetic valve is arranged on the inflation pipe and used for controlling the opening and closing of the inflation pipe.

[0012] In order to facilitate the contraction and reset of the air bag column, further, a pressure relief pipe is arranged and communicated with the inflation pipe, and a valve switch is arranged on the pressure relief pipe.

[0013] In order to filter and remove impurities from the gas input through the input end of the booster pump, further, an activated carbon filter screen is fixedly installed in the input end of the booster pump.

[0014] Compared with the prior art, the plastic bag production device has the following beneficial effects:

[0015] The air bag blowing film method is adopted, compared with the traditional air blowing film method, the air bag blowing film method can more uniformly apply the blowing force to the tube blank, improves the thickness uniformity and size precision of the film, and can produce the degradable plastic bag with more stable quality, and the air bag column after being inflated can support the film during the film blowing process, effectively prevents the shaking of the film, reduces the quality problems such as wrinkles and uneven thickness caused by shaking, and improves the quality of the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structure diagram of the utility model Figure 1 ;

[0017] Figure 2 is a structure diagram of the utility model Figure 2 ;

[0018] Figure 3 is a sectional view of the plastic parison base, the supporting shaft and the air bag column of the utility model

[0019] Figure 4 is an enlarged view of part A of the utility model Figure 3 .

[0020] In the figure: 1, plastic embryo base; 101, plastic embryo cavity; 102, feed pump; 103, feed pipe one; 104, feed pipe two; 2, support shaft; 201, limit disc; 202, air bag column; 203, gas conveying cavity; 204, inflation hole; 205, inflation pipe; 206, pressure relief pipe; 3, booster pump; 301, activated carbon filter screen; 4, support rod; 401, annular sleeve; 402, hollow cavity; 403, air injection hole; 404, branch pipe. DETAILED DESCRIPTION

[0021] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0022] Embodiment 1

[0023] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , the blow film device for degradable plastic bags comprises a plastic embryo base 1, a plastic embryo cavity 101 is formed in the plastic embryo base 1, the upper end of the plastic embryo cavity 101 is provided in an open manner, further comprising: a support shaft 2 fixedly connected to the plastic embryo base 1 and coaxially arranged with the plastic embryo cavity 101, wherein two limit discs 201 are fixedly connected to the support shaft 2, an air bag column 202 is fixedly installed between the two limit discs 201, a gas conveying cavity 203 penetrating through the plastic embryo base 1 is formed in the support shaft 2, and an inflation hole 204 is formed in the support shaft 2 and communicates with the gas conveying cavity 203 and the air bag column 202; an inflation pipe 205 is arranged on the plastic embryo base 1 and communicates with the gas conveying cavity 203; a feed mechanism is arranged on the plastic embryo base 1 and used for feeding raw materials into the plastic embryo cavity 101.

[0024] The feed mechanism comprises a feed pump 102, a feed pipe one 103 and a feed pipe two 104, the feed pump 102 is fixedly installed on the plastic embryo base 1, the feed pipe one 103 communicates with the input end of the feed pump 102, the feed pump 102 communicates with a raw material hot melting tank through the feed pipe one 103, the feed pipe two 104 communicates with the output end of the feed pump 102, and the feed pump 102 communicates with the plastic embryo cavity 101 through the feed pipe two 104.

[0025] A booster pump 3 is fixedly installed on the plastic embryo base 1, and the end of the inflation pipe 205 away from the gas conveying cavity 203 communicates with the output end of the booster pump 3.

[0026] Further comprising a solenoid valve arranged on the inflation pipe 205 and used for controlling the opening and closing of the inflation pipe 205.

[0027] In use, the raw material of degradable plastic in the raw material hot melting tank is extracted under the action of the feed pump 102, and then is transported to the plastic preform cavity 101 through the feed pipe two 104, with the continuous injection of the raw material, the raw material gradually forms a tube blank in the plastic preform cavity 101, and is extruded in a predetermined shape, then the operator pulls the tube blank upwards and sleeves the tube blank to the supporting shaft 2 with the air bag column 202, then the electromagnetic valve is opened, the booster pump 3 is started, the gas enters the air bag column 202 through the inflation pipe 205, the gas conveying cavity 203 and the inflation hole 204, the air bag column 202 is gradually inflated under the action of the internal pressure, and the inflation force of the air bag column 202 acts on the tube blank, so that the tube blank is stretched and expanded in the radial direction to form a film, due to the shape and structural characteristics of the air bag column 202, the inflation force is relatively uniform, so that the thickness and width of the film can be relatively uniformly formed to a certain extent, and the inflated air bag column 202 can also support the film, effectively preventing the film from shaking, reducing the quality problems such as wrinkles and uneven thickness caused by shaking, and improving the quality of the product, then the film is pulled at a set pulling speed by means of the traction device, so that the film is stretched and conveyed in a stable state, and finally the film is wound into a roll by means of the winding device, and the production process of the degradable plastic bag film is completed.

[0028] Meanwhile, in the film blowing process, the inflation degree and gas pressure of the air bag column 202 can be controlled by adjusting the opening degree of the electromagnetic valve, so that the thickness and width of the film can be conveniently adjusted, thereby meeting the production requirements of degradable plastic bags of different specifications.

[0029] In summary, by adopting the air bag film blowing method, compared with the traditional air jet film blowing, the air bag can more uniformly apply the blowing force to the tube blank, improve the thickness uniformity and size precision of the film, and produce degradable plastic bags with more stable quality.

[0030] The air bag can support the film during the film blowing process, effectively prevent the film from shaking, reduce the quality problems such as wrinkles and uneven thickness caused by shaking, and improve the quality of the product.

[0031] It should be noted that the inflation pipe 205 and the branch pipe 404 are provided with one-way valves.

[0032] Example 2:

[0033] Referring to Figure 3 , Figure 4The blow film device for degradable plastic bags is basically the same as that in Embodiment 1, and further, an annular sleeve 401 is sleeved on the upper end of the air bag column 202, the annular sleeve 401 is fixedly connected with the plastic blank base 1 through a support rod 4, a hollow cavity 402 is formed on the annular sleeve 401, a plurality of air injection holes 403 are equidistantly formed on the inner side wall of the annular sleeve 401 and are in communication with the hollow cavity 402, a branch pipe 404 is arranged on the annular sleeve 401 and is in communication with the hollow cavity 402, and one end of the branch pipe 404 away from the hollow cavity 402 is in communication with the inflation pipe 205.

[0034] In the process of blow film, the gas is transmitted through the inflation pipe 205 after being pressurized by the booster pump 3, part of the gas directly enters the gas transmission cavity 203 of the support shaft 2 and then inflates the air bag column 202, so that the air bag column 202 is inflated to perform the blow film operation on the plastic blank, and the other part of the gas enters the hollow cavity 402 of the annular sleeve 401 through the branch pipe 404 and is finally sprayed out through the air injection hole 403 to the outer surface of the film, so that the heat of the film can be quickly taken away to accelerate cooling, thereby realizing the rapid solidification and shaping of the film.

[0035] Embodiment 3:

[0036] With reference to Figure 3 The blow film device for degradable plastic bags is basically the same as that in Embodiment 1, and further, a pressure relief pipe 206 is further included, the pressure relief pipe 206 is in communication with the inflation pipe 205, and a valve switch is arranged on the pressure relief pipe 206.

[0037] When the blow film is completed, the electromagnetic valve and the booster pump 3 are closed, if it is necessary to adjust the size of the film or to perform the next round of blow film, the gas in the air bag column 202 can be released by opening the valve switch on the pressure relief pipe 206, at this time, the gas is sequentially discharged from the air bag column 202 through the gas transmission cavity 203, the inflation pipe 205 and the pressure relief pipe 206, and after the gas in the air bag column 202 is completely discharged, the above-mentioned process of inflating the air bag column 202 and blow film can be repeated.

[0038] Embodiment 4:

[0039] With reference to Figure 3 The blow film device for degradable plastic bags is basically the same as that in Embodiment 1, and further, an active carbon filter screen 301 is further included, the active carbon filter screen 301 is fixedly installed in the input end of the booster pump 3.

[0040] Before the gas enters the booster pump 3, the activated carbon filter screen 301 can adsorb impurities, moisture and odors and other harmful substances in the gas, for example, for dust particles, organic volatile substances and other impurities that may be contained in the air, the activated carbon filter screen 301 adsorbs these impurities on the surface and in the internal pores through its porous structure, prevents dust particles and other impurities from entering the booster pump 3, the hollow cavity 402, not only protects the internal components of the booster pump 3, reduces equipment failure caused by impurities abrasion or blockage, prolongs the service life of the booster pump 3, but also avoids the mixing of impurities into the film to affect the quality of the film, thereby improving the purity and transparency of the degradable plastic bag film.

[0041] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application in any form. Although the preferred embodiments of the present application have been disclosed as above, they are not intended to limit the present application.

Claims

1. A blow film device for degradable plastic bags, comprising a plastic preform base (1), a plastic preform cavity (101) is formed in the plastic preform base (1), and the upper end of the plastic preform cavity (101) is provided with an opening, characterized in that, Also include: Supporting shaft (2) is fixedly connected on the plastic embryo base (1), and is coaxially arranged with the plastic embryo cavity (101), Wherein, the supporting shaft (2) is fixedly connected with two limit discs (201), the air bag column (202) is fixedly installed between the two limit discs (201), the supporting shaft (2) is provided with a gas conveying cavity (203) penetrating the plastic embryo base (1), and the supporting shaft (2) is provided with a gas filling hole (204) in communication with the gas conveying cavity (203) and the air bag column (202) respectively; The inflation pipe (205) is arranged on the plastic embryo base (1) and is in communication with the gas conveying cavity (203); The material conveying mechanism is arranged on the plastic embryo base (1) and is used for conveying raw materials into the plastic embryo cavity (101).

2. The degradable plastic bag blowing film apparatus according to claim 1, wherein, The material conveying mechanism includes a feed pump (102), a first material conveying pipe (103) and a second material conveying pipe (104), the feed pump (102) is fixedly installed on the plastic embryo base (1), the first material conveying pipe (103) is in communication with the input end of the feed pump (102), the feed pump (102) is in communication with the raw material hot melting tank through the first material conveying pipe (103), the second material conveying pipe (104) is in communication with the output end of the feed pump (102), and the feed pump (102) is in communication with the plastic embryo cavity (101) through the second material conveying pipe (104).

3. The degradable plastic bag blowing film apparatus according to claim 1, wherein, The plastic embryo base (1) is fixedly installed with a booster pump (3), and one end of the inflation pipe (205) away from the gas conveying cavity (203) is in communication with the output end of the booster pump (3).

4. The degradable plastic bag blowing film apparatus according to claim 3, wherein, The upper end of the air bag column (202) is sleeved with an annular sleeve (401), the annular sleeve (401) is fixedly connected with the plastic embryo base (1) through a supporting rod (4), the annular sleeve (401) is provided with a hollow cavity (402), a plurality of jet holes (403) are equidistantly arranged on the inner wall of the annular sleeve (401) and in communication with the hollow cavity (402), a branch pipe (404) is arranged on the annular sleeve (401) and in communication with the hollow cavity (402), and one end of the branch pipe (404) away from the hollow cavity (402) is in communication with the inflation pipe (205).

5. The degradable plastic bag blowing film apparatus according to claim 3, wherein, Also include solenoid valve, the solenoid valve is arranged on the inflation pipe (205), and is used for controlling the opening and closing of the inflation pipe (205).

6. The degradable plastic bag blowing film apparatus according to claim 5, wherein, Also include a pressure relief pipe (206), the pressure relief pipe (206) is in communication with the inflation pipe (205), and the pressure relief pipe (206) is provided with a valve switch.

7. The degradable plastic bag blowing film apparatus according to claim 3, wherein, Also include an activated carbon filter screen (301), the activated carbon filter screen (301) is fixedly installed in the input end of the booster pump (3).

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