CN111017358A

CN111017358A - Plastic barrel with embedded barrel opening and manufacturing method thereof

Info

Publication number: CN111017358A
Application number: CN201911295953.4A
Authority: CN
Inventors: 罗长虎; 孙长允; 吴斌
Original assignee: Shanghai Jiqi Plastic Products Co Ltd
Current assignee: Shanghai Jiqi Plastic Products Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-04-17

Abstract

The invention discloses a plastic barrel with an embedded barrel opening and a manufacturing method thereof, belonging to the technical field of plastic product processing, and the technical key points are as follows: the utility model provides a plastic drum with embedded bung hole, plastic drum includes upper end open-ended staving, and the staving is close to the opening part and has set firmly the go-between, and the rigid coupling has a smooth embedded bung hole ring piece of inner wall on the go-between inner wall, and embedded bung hole ring piece extends towards the go-between direction in the one side of keeping away from the staving to be equipped with the turn-ups, the turn-ups is keeping away from the side level setting of staving. The manufacturing method comprises the following steps: preparing materials, mixing, melting, extruding, injection molding to obtain an embedded type bucket opening ring piece with a flanging, placing plastic particles in a hollow blow molding machine mold, extruding a tubular blank, performing blow molding to obtain a plastic bucket, cooling, shaping, collecting finished products, packaging and warehousing. The invention has convenient operation and rigorous and reasonable design, can improve the flatness of the bucket opening, and is beneficial to reducing the phenomenon of water leakage of the bucket opening when the cover covers the bucket opening.

Description

Plastic barrel with embedded barrel opening and manufacturing method thereof

Technical Field

The invention belongs to the technical field of plastic product processing, and particularly relates to a plastic barrel with an embedded barrel opening and a manufacturing method thereof.

Background

The plastic barrel is mainly used for storing and transporting various liquids, has good characteristics for special dangerous goods packaging, has the characteristics of low probability of breakage, no rustiness, light weight and the like, has oil resistance and strong corrosion resistance, and is mainly used for packaging dangerous goods which need heat preservation, moisture protection, pressure resistance and corrosion resistance. The plastic barrel is mainly made of polyethylene, polypropylene, polyester and other plastics through blow molding, injection molding, plastic sucking and rotational molding, and is mainly used for containing liquid and solid articles in the industries of chemical industry, pesticide, medicine, food, hardware electronics, electromechanics and the like. The main raw material for producing the plastic barrel is Polyethylene (PE), which is referred to as PE for short, and is a macromolecular organic compound formed by performing addition polymerization on ethylene.

In the actual production process at present, in the blowing process, because reasons such as the angle of air pressure blowing, unstable blowing air pressure or materials, there is some accumulated material at the inside joint line of bung hole, and there is some wrinkle at the outside joint line of bung hole, and phenomenons such as unevenness or burr can appear in the bung hole surface of plastic drum this moment, and water can leak out from joint line position or unevenness's position after the operator covers from this, consequently need provide a new technical scheme and solve above-mentioned problem.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the plastic barrel with the embedded barrel opening, so that the flatness of the barrel opening is improved, and the phenomenon of water leakage of the barrel opening when a cover covers the barrel opening is reduced.

In order to achieve the first purpose, the invention provides the following technical scheme: the utility model provides a plastic drum with embedded bung hole, plastic drum includes the staving of upper end open-ended, the staving is close to the opening part and has set firmly the go-between, the rigid coupling has a smooth embedded bung hole ring piece of inner wall on the go-between inner wall, the ring piece extends towards the go-between direction in the one side of keeping away from the staving in the embedded bung hole to be equipped with the turn-ups, the turn-ups is keeping away from the side level setting of staving.

By adopting the technical scheme, the embedded type barrel opening inner ring piece with the flanging is fixedly arranged on the connecting ring, and meanwhile, the flanging is horizontally arranged on the side surface far away from the barrel body, so when the cover is covered on the flanging, the inner wall of the cover can be just tightly abutted against the flanging, and at the moment, liquid (such as water or beverage) in the plastic barrel cannot flow out from the junction of the cover and the flanging, and the problem of poor sealing performance of the plastic barrel is greatly solved.

The present invention in a preferred example may be further configured to: the flanging is fixedly connected with the connecting ring.

By adopting the technical scheme, after the flanging is fixedly connected with the connecting ring, the connecting area between the ring piece in the embedded barrel opening with the flanging and the connecting ring is increased, and the connecting stability between the ring piece and the connecting ring is greatly improved.

The present invention in a preferred example may be further configured to: the maximum diameter of the flanging is larger than or equal to the maximum outer diameter of the connecting ring.

Preferably, the maximum diameter of the flange is equal to the maximum outer diameter of the connecting ring.

By adopting the technical scheme, the contact area between the flanging and the cover is large, and the normal opening and closing of the cover cannot be influenced, so that the contact area between the ring piece in the embedded barrel opening with the flanging and the cover is improved, and the phenomenon of water leakage of the plastic barrel from the opening is effectively reduced.

The present invention in a preferred example may be further configured to: the flange and the ring piece in the embedded barrel opening are in smooth transition.

Through adopting above-mentioned technical scheme, when the plastic drum returned to under the normal state of placing, the liquid that was located turn-ups department this moment can flow back to the holding cavity of plastic drum automatically, and the phenomenon that the liquid long-pending stays in turn-ups department that has significantly reduced takes place to make the plastic drum realize better storage and the function of gathering liquid.

The present invention in a preferred example may be further configured to: the height of the ring piece in the embedded barrel opening is smaller than or equal to that of the connecting ring.

If when the height of the ring piece in the embedded type barrel opening is higher than that of the connecting ring, part of the ring piece in the embedded type barrel opening protrudes out of the connecting ring, when a user needs to pour water, the water between the ring piece in the embedded type barrel opening and the inner wall of the barrel body is blocked by the ring piece in the embedded type barrel opening, and cannot be poured out smoothly, so that the ring piece in the embedded type barrel opening at the position of the inner wall of the connecting ring cannot influence normal water pouring by adopting the technical scheme.

Aiming at the defects in the prior art, the invention aims to provide a manufacturing method of a plastic barrel with an embedded barrel opening, which is convenient to operate and rigorous and reasonable in process design, can improve the flatness of the barrel opening, and is beneficial to reducing the phenomenon that the barrel opening leaks when a cover covers the barrel opening.

In order to achieve the second purpose, the invention provides the following technical scheme: a method for manufacturing a plastic barrel with an embedded barrel opening comprises the following operation steps:

step one, preparing materials and mixing the materials;

step two, melting and extruding: heating the mixture obtained in the first step to 150-;

step three, placing the plastic particles in a mould of an injection molding machine to prepare an embedded type barrel opening inner ring piece with a flanging;

placing the plastic particles in a mold of a hollow blow molding machine, and extruding a tubular blank;

step five, blow molding: placing the tubular blank and the embedded barrel opening inner ring piece with the flanging into an inner cavity of a blow molding mold, and placing plastic particles into the mold of a blow molding machine for blow molding to obtain a plastic barrel;

step six, cooling and shaping;

step seven, collecting finished products;

and step eight, packaging and warehousing.

The present invention in a preferred example may be further configured to: the raw materials comprise, by weight, 100 parts of PE plastic particles, 2 parts of color master batches and 15-20 parts of old PE powder.

By adopting the technical scheme, the raw materials are firstly added into the color master batch according to the proportion for mixing, and then the mixture is heated, melted and extruded to obtain uniformly mixed plastic particles (each plastic particle has uniform color and luster and uniform shape and size); and then, manufacturing the embedded type bucket opening inner ring piece with the flanging by injection molding, and meanwhile, putting the embedded type bucket opening inner ring piece with the flanging into a specific cavity of a mold of a forming machine for fixing. And then the connecting ring is fixedly connected with the embedded barrel mouth inner ring piece with the flanging under the action of a blow molding machine, and a stable structure is formed. Then cool to room temperature, finished product collection packing warehouse in afterwards can, the operation is very convenient, adopts above-mentioned mode simultaneously can also improve the roughness of bung hole, helps reducing the phenomenon that the bung hole appears leaking when lid closes the bung hole.

The present invention in a preferred example may be further configured to: in the third step, the temperature of injection molding is 190-200 ℃, and the pressure is 40-65 MPa.

The present invention in a preferred example may be further configured to: in step three, the injection molding operation is as follows:

(1) first-stage injection molding: controlling the injection pressure within 35-55MPa, and injecting 80-90wt% of plastic particles within 1-2 s;

(2) and (3) second-stage injection molding: controlling the injection pressure within 55-60MPa, and injecting 3-5 wt% of plastic particles within 2-4 s;

(3) and (3) first-stage pressure maintaining: controlling the injection pressure within 40-50MPa, and injecting the residual plastic particles within 2-3.5 s;

(4) and (3) cooling and forming: taking out after cooling and forming, and controlling the cooling time to be 30-45 s.

By adopting the technical scheme, the temperature, the air pressure and the inflation time of injection molding are reasonably controlled, so that the smoothness and the flatness of the outer surface of the flanged embedded intraoral ring piece of the barrel can be improved, the quality of the flanged embedded intraoral ring piece of the barrel is improved, and the preparation for the good water leakage prevention performance of the whole plastic barrel is prepared.

The present invention in a preferred example may be further configured to: in step five, the specific operation requirements of blow molding are as follows: the temperature is controlled at 190-²。

By adopting the technical scheme, the barrel body can be obtained quickly and well by reasonably controlling the temperature, the air pressure and the inflation time of blow molding, the damage of the temperature and the pressure to the performance of the ring piece in the embedded barrel opening with the flanging obtained by injection molding is reduced, and the stability of the connection between the barrel body and the ring piece in the embedded barrel opening with the flanging is greatly improved.

In conclusion, the invention has the following beneficial effects:

1. the invention improves the flatness of the bucket opening, and is beneficial to reducing the phenomenon of water leakage of the bucket opening when the cover covers the bucket opening;

2. optimally, the contact area between the flanging and the cover is large, and the normal opening and closing of the cover cannot be influenced, so that the contact area between the ring piece in the embedded barrel opening with the flanging and the cover is favorably increased, and the phenomenon of water leakage of the plastic barrel from the opening is effectively reduced;

3. the manufacturing method of the invention has the advantages of convenient operation and rigorous and reasonable process design, can improve the flatness of the bung hole, and is beneficial to reducing the phenomenon of water leakage of the bung hole when the bung hole is covered by the cover.

Drawings

FIG. 1 is a perspective view of a plastic with an in-line bung;

FIG. 2 is a cross-sectional view of a plastic with an in-line bung;

fig. 3 is an enlarged view of a in fig. 2.

Description of the drawings: 1. a barrel body; 2. an opening; 3. a connecting ring; 4. embedding a ring piece in the barrel opening; 5. and (5) flanging.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

First, an embodiment

Example 1: a plastic bucket with an embedded bucket opening is shown in figure 1, and comprises a bucket body 1 with an opening 2 at the upper end, wherein the bucket body 1 is approximately cylindrical. A cylindrical connecting ring 3 is fixedly arranged on the barrel body 1 near the opening 2, and the maximum outer diameter of the connecting ring 3 is far smaller than that of the barrel body 1. As can be seen from fig. 2 and 3, an embedded type inner ring 4 (see fig. 3) with a smooth inner wall is fixedly connected to the inner wall of the connecting ring 3, and the embedded type inner ring 4 extends towards the connecting ring 3 on the side away from the barrel body 1 and is fixedly connected with a flange 5. The flanging 5 is horizontally arranged on the side surface far away from the barrel body 1, and meanwhile, the maximum diameter of the flanging 5 is equal to the maximum outer diameter of the connecting ring 3.

Furthermore, in order to reduce liquid accumulation at the flange 5, the transition between the flange 5 and the ring 4 in the inner part of the in-line keg opening is smooth. If the height of the ring member 4 in the embedded type bung is higher than that of the connecting ring 3, and part of the ring member 4 in the embedded type bung protrudes out of the connecting ring 3, when a user needs to pour water, the water between the ring member 4 in the embedded type bung and the inner wall of the barrel body 1 is blocked by the ring member 4 in the embedded type bung and cannot be poured out smoothly, so that the height of the ring member 4 in the embedded type bung is less than or equal to that of the connecting ring 3 in order to reduce the influence of the existence of the ring member 4 in the embedded type bung on normal pouring of liquid (such as pouring water)

The method for manufacturing the plastic bucket with the embedded bucket opening of the embodiment 1 comprises the following operation steps:

step one, preparing materials and mixing the materials; the raw materials comprise, by weight, 100 parts of PE plastic particles, 2 parts of color master batches and 15-20 parts of old PE powder (the old PE powder refers to powder particles obtained by crushing unqualified light-colored plastic barrels), and the raw materials are uniformly mixed to obtain a mixture.

Step two, melting and extruding: heating the mixture obtained in the first step to 150-.

And step three, placing the plastic particles in a mould of an injection molding machine to prepare the ring piece 4 with the flanging 5 in the embedded type barrel opening. In step three, the injection molding operation is as follows:

(1) first-stage injection molding: controlling the injection pressure within 35MPa, and injecting 80 wt% of plastic particles within 1 s;

(2) and (3) second-stage injection molding: controlling the injection pressure within 55MPa, and injecting 3 wt% of plastic particles within 2 s;

(3) and (3) first-stage pressure maintaining: controlling the injection pressure within 40MPa, and injecting the residual plastic particles within 2 s;

(4) and (3) cooling and forming: and taking out after cooling and forming, wherein the cooling time is controlled to be 30 s.

And step four, placing the plastic particles in a mold of a hollow blow molding machine, and extruding a tubular blank.

Step five, blow molding: and (3) placing the tubular blank and the embedded inner barrel opening ring piece 4 with the flanging 5 into an inner cavity of a blow molding die, and placing the plastic particles into a blow molding machine die for blow molding to obtain the plastic barrel. Wherein, the specific operation requirements of blow molding are as follows: the temperature is controlled to be 191 ℃, the exhaust time is 5 seconds, the air blowing time is 26 seconds, the packing time is 10 seconds, the air blowing delay is 0.4 second, and the air blowing pressure is 7kg/m²。

And step six, cooling the plastic barrel to room temperature (namely 20 ℃) through a vacuum cooling box, and cooling and shaping.

And step seven, collecting finished products.

And step eight, packaging and warehousing.

Example 2: the difference between the manufacturing method of the plastic barrel with the embedded type barrel opening and the embodiment 1 is that: in step three, the injection molding operation is as follows:

(1) first-stage injection molding: controlling the injection pressure within 40MPa, and injecting 85 wt% of plastic particles within 1.2 s;

(2) and (3) second-stage injection molding: controlling the injection pressure within 58MPa, and injecting 4 wt% of plastic particles within 3 s;

(3) and (3) first-stage pressure maintaining: controlling the injection pressure within 45MPa, and injecting the residual plastic particles within 3 s;

(4) and (3) cooling and forming: taking out after cooling and forming, and controlling the cooling time to be 40 s.

Example 3: the difference between the manufacturing method of the plastic barrel with the embedded type barrel opening and the embodiment 1 is that: in step three, the injection molding operation is as follows:

(1) first-stage injection molding: controlling the injection pressure within 55MPa, and injecting 90wt% of plastic particles within 2 s;

(2) and (3) second-stage injection molding: controlling the injection pressure within 60MPa, and injecting 5 wt% of plastic particles within 4 s;

(3) and (3) first-stage pressure maintaining: controlling the injection pressure within 50MPa, and injecting the residual plastic particles within 3.5 s;

(4) and (3) cooling and forming: and taking out after cooling and forming, wherein the cooling time is controlled to be 45 s.

Example 4: the difference between the manufacturing method of the plastic barrel with the embedded type barrel opening and the embodiment 1 is that: in step three, the injection molding operation is as follows:

(2) and (3) second-stage injection molding: controlling the injection pressure within 60MPa, and injecting 3 wt% of plastic particles within 2 s;

Example 5: plastic with embedded barrel openingThe charging basket and the manufacturing method thereof are different from those of the embodiment 4 in that: in step five, the specific operation requirements of blow molding are as follows: the temperature is controlled at 190 ℃, the exhaust time is 3 seconds, the air blowing time is 25 seconds, the packing time is 8 seconds, the air blowing delay is 0.2 seconds, and the air blowing pressure is 6kg/m²。

Example 6: a plastic barrel with an embedded barrel opening and a manufacturing method thereof are different from those of embodiment 4 in that: in step five, the specific operation requirements of blow molding are as follows: the temperature is controlled at 192 ℃, the exhaust time is 8 seconds, the air blowing time is 30 seconds, the packing time is 12 seconds, the air blowing delay is 0.5 seconds, and the air blowing pressure is 10kg/m²。

Second, comparative example

Comparative example 1: a plastic bucket with an embedded bung, different from example 1 in that: an in-line inner ring 4 with a flanging 5 is not arranged at the opening 2 of the barrel body 1.

Comparative example 2: a plastic bucket with an embedded bung, different from example 1 in that: only the embedded inner ring piece 4 is arranged at the opening 2 of the barrel body 1, but the flanging 5 is not arranged.

Comparative example 3: a plastic bucket with an embedded bung, different from example 1 in that: and setting the operation of manually trimming and polishing the connecting ring 3 between the sixth step and the seventh step.

Third, performance detection and analysis

Test one: water leakage prevention test

Test subjects: the plastic barrels prepared in examples 1 to 6 were used as sample samples 1 to 6, and the plastic barrels prepared in comparative examples 1 to 3 were used as control samples 1 to 3, for a total of 9 groups of 50 small samples each.

The test method comprises the steps of preparing 450 pieces of white paper and a culture dish, placing 50 pieces of white paper in the culture dish of a test bed in sequence each time, adding clear water into a sample 1-6 and a reference sample 1-3, dripping 5-8 drops of red ink into the clear water, enabling the average first weight G0 of 50 plastic barrels with water to be about 0.5kg, covering common plastic covers at openings of the plastic barrels, manually pressing the plastic covers against the openings respectively by an operator, keeping the plastic barrels in a horizontal state for 10 seconds, requiring that each piece of white paper at the barrel opening is placed up and down correspondingly, observing whether red ink watermarks appear on the white paper, recording the average weight G1 of the plastic barrels with water after the test, calculating the average weight difference △ G, and then registering the test result in the table 1.

And (3) test results: as can be seen from Table 1, the number of sheets of red ink prints appearing in test samples 1-6 was substantially maintained within 3 sheets; while the number of sheets of red ink marks appearing in control samples 1-2 was maintained substantially above 25, control sample 3 was slightly less than the number of sheets of red ink marks appearing in control samples 1-2, but significantly more than the number of sheets of red ink marks appearing in sample samples 1-6. Next, from the viewpoint of the average weight difference, it is found that the average weight difference of the above-mentioned test samples 1 to 6 is within 0.026kg, while the average weight difference of the control sample 1 is 0.105kg, the average weight difference of the control sample 2 is 0.089kg, and the average weight difference of the control sample 3 is 0.06kg, and thus it is found that the water leakage preventing performance of the control samples 1 to 3 is inferior to that of the test samples 1 to 6.

TABLE 1 test results of Water leakage prevention test for sample 1-6 and control sample 1-3

The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a plastic drum with embedded bung hole, plastic drum include staving (1) of upper end opening (2), staving (1) is close to opening (2) department and has set firmly go-between (3), its characterized in that, the rigid coupling has a smooth embedded intraoral ring piece of staving (4) of inner wall on go-between (3) inner wall, ring piece (4) extend towards go-between (3) direction in one side of keeping away from staving (1) in the embedded bung hole to be equipped with turn-ups (5) are in the side level setting of keeping away from the staving.

2. The plastic bucket with an embedded bucket opening as claimed in claim 1, characterized in that the flanging (5) is fixedly connected with the connecting ring (3).

3. The plastic bucket with an embedded bung according to claim 2, characterized in that the maximum diameter of the flanging (5) is greater than or equal to the maximum outer diameter of the connecting ring (3).

4. A plastic keg with an in-line bung according to claim 3, characterized in that the transition between the flange (5) and the in-line bung ring (4) is smooth.

5. The plastic bucket with an embedded bucket opening according to claim 4, wherein the height of the ring piece (4) in the embedded bucket opening is less than or equal to the height of the connecting ring (3).

6. A method for manufacturing a plastic bucket with an embedded bucket opening according to any one of claims 1-5, which comprises the following steps:

step one, preparing materials and mixing the materials;

thirdly, placing the plastic particles in a mould of an injection molding machine to prepare an embedded type ring piece (4) with a flanging (5) in the barrel opening;

step five, blow molding: placing a tubular blank and an embedded type barrel opening inner ring piece (4) with a flanging (5) in an inner cavity of a blow molding mold, and placing plastic particles in the mold of a blow molding machine for blow molding to obtain a plastic barrel;

step six, cooling and shaping;

step seven, collecting finished products;

and step eight, packaging and warehousing.

7. The method as claimed in claim 6, wherein the injection molding temperature is 190-200 ℃ and the pressure is 40-65MPa in step three.

8. The plastic bucket with the embedded bucket opening and the manufacturing method thereof as claimed in claim 6, wherein in the third step, the injection molding is carried out as follows:

9. The plastic bucket with the embedded bucket opening and the manufacturing method thereof as claimed in claim 6, wherein in the fifth step, the specific operation requirements of the blow molding are as follows: the temperature is controlled at 190-²。