CN110843196A - Plastic suction forming processing technology - Google Patents
Plastic suction forming processing technology Download PDFInfo
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- CN110843196A CN110843196A CN201911162770.5A CN201911162770A CN110843196A CN 110843196 A CN110843196 A CN 110843196A CN 201911162770 A CN201911162770 A CN 201911162770A CN 110843196 A CN110843196 A CN 110843196A
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- Prior art keywords
- plastic
- plastic sheet
- sheet
- electrostatic adsorption
- suction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/70—Maintenance
- B29C33/72—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/264—Auxiliary operations prior to the thermoforming operation, e.g. cutting
Abstract
The invention discloses a plastic suction forming processing technology, which relates to the related field of plastic suction forming, and reduces the reject ratio of a final plastic suction finished product by the related improvement of the processing technology, thereby avoiding the influence of various defect problems on the appearance and the property of the finished product. The method comprises the following steps: s1: selecting a plastic sheet; s2: placing the plastic sheet in warm water for heating; s3: placing the heated plastic sheet in a vacuum box, and defoaming in vacuum; s4: drying the defoamed plastic sheet to remove surface moisture; s5: flattening the plastic sheet defoamed by the S3 by using flattening equipment; s6: an electrostatic adsorption structure is arranged at the upper end of a plastic suction mould of the plastic suction machine; s7: placing the plastic sheet obtained in the step S5 at the upper end of a plastic suction mould of a plastic suction machine, and fixing; s8: moving the electrostatic adsorption structure of S6 downward; s9: heating the plastic sheet, and carrying out plastic suction molding; s10: separating the molded plastic product from the plastic suction mold; s11: and removing the material edges of the finished plastic product.
Description
Technical Field
The invention relates to the field related to plastic suction molding, in particular to a plastic suction molding processing technology.
Background
The plastic uptake is a plastic processing technology, and the main principle is that after a flat plastic hard sheet is heated and softened, the plastic hard sheet is absorbed on the surface of a mould in vacuum, cooled and formed, and the plastic hard sheet is applied to a technical process of various industries. The plastic uptake product has wide application, and is mainly used in the industries of electronics, electrical appliances, food, hardware and tools, cosmetics, toys, daily necessities, medicines, health products, automobiles, stationery, and the like.
The blister product adopts the thick plate blister and the thin plate blister technology, the finished product can have the defects of pull lines, scratches, crystal points, bubbles, water ripples and the like, and some defects can be avoided in the processing process, for example, the defects of the pull lines can be solved by revising a mould (reducing the height and increasing the smoothness of a circle) and adding an additional pressure mould (called as an upper mould), the problem of the water ripples can be solved by adjusting the heating temperature, so that the heating temperature of the plastic product just ensures the blister molding, the additional tension molding caused by vacuum adsorption can not exist, the water ripples caused by the incomplete heating to the proper temperature processing molding can be avoided, the scratches can improve the fine manufacturing of each structure, each straight edge chamfer is rounded to avoid the occurrence, but some defects can not be avoided by the improvement of the blister related structure, such as the crystal points and the bubbles, many crystal points are caused by dust which is invisible to naked eyes, and air bubbles are contained in the plastic product for heating the raw material, so that even if the plastic product is heated and formed, the air still exists in the plastic product, and the air bubbles appear in the finished product; therefore, the market urgently needs to develop a plastic uptake forming processing technology to help people solve the existing problems.
Disclosure of Invention
The invention aims to provide a blister forming processing technology, which reduces the reject ratio of final blister finished products and avoids the influence of various defect problems on the appearance and the properties of the finished products through the relevant improvement of the processing technology.
In order to achieve the purpose, the invention provides the following technical scheme: a plastic uptake forming processing technology comprises the following steps:
s1: selecting a plastic sheet;
s2: placing the plastic sheet in warm water for heating;
s3: placing the heated plastic sheet in a vacuum box, and defoaming in vacuum;
s4: drying the defoamed plastic sheet to remove surface moisture;
s5: flattening the plastic sheet defoamed by the S3 by using flattening equipment;
s6: an electrostatic adsorption structure is arranged at the upper end of a plastic suction mould of the plastic suction machine;
s7: placing the plastic sheet obtained in the step S5 at the upper end of a plastic suction mould of a plastic suction machine, and fixing;
s8: moving the electrostatic adsorption structure of S6 downward;
s9: heating the plastic sheet, and carrying out plastic suction molding;
s10: separating the molded plastic product from the plastic suction mold;
s11: and removing the material edges of the finished plastic product.
Preferably, in S1, the size of the plastic sheet is smaller than that of the plastic sheet conventionally used for manufacturing the plastic product, and the thickness of the plastic sheet is larger than that of the plastic sheet conventionally used for manufacturing the plastic product.
Preferably, in S2, the warm water is maintained at 70 ℃, the warm water is heated to 100 ℃ and then cooled to 70 ℃, and the plastic sheet is heated while maintaining the temperature.
Preferably, in S5, before the flattening, electrostatic adsorption treatment is performed on the surface of the flattening plate of the flattening device.
Preferably, in S6, the electrostatic adsorption structure is a rectangular structure with a missing lower end face, the other five inner walls of the rectangular structure are provided with electrostatic adsorption plates, and the upper end of the electrostatic adsorption structure is provided with a cylinder fixed to the plastic sucking machine.
Preferably, in S8, the electrostatic adsorption structure is completely covered outside the plastic mold and the plastic sheet.
Preferably, in S11, the trimming is removed by a punching die or a cutter, and a deburring process is performed.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, before the plastic sheet is fixed and processed, warm water is heated to keep the plastic sheet in a softened but unmelted state, and the plastic sheet can be deformed, so that the plastic sheet is processed in a vacuum defoaming mode; because the bubbles are sucked out, but certain moisture exists on the surface, the bubbles are heated again while the moisture is removed through drying operation, then the holes formed by the bubbles is filled through flattening treatment, the size and the thickness of the plastic sheet which is selected at the beginning are smaller and thicker than those of the plastic sheet required by the plastic product, after the flattening treatment, the size and the thickness of the plastic sheet reach the raw material standard for manufacturing the plastic product, so that the subsequent treatment is carried out, and through defoaming and related treatment steps, the possibility of bubbles appearing in the final finished product is greatly reduced from the increase of external equipment and the change of the processing technology, so that the product reject ratio caused by the defects is reduced;
2. in the invention, before formal blow molding, after the plastic suction processing step, the electrostatic adsorption of the mold is required to be carried out, so that the phenomenon that part of fine dust exists on the surface of the mold and is extruded into a plastic product to cause crystal points during plastic suction molding is avoided, a plastic sheet is placed after the plastic suction processing step, and the electrostatic adsorption structure is covered outside, so that the influence of external dust on the plastic product is avoided, the influence of dust inside a formed space is avoided, the visible invisible fine dust is adsorbed under the action of the electrostatic adsorption structure and does not influence the plastic product, the possibility that the crystal points appear on the final product is greatly reduced, and the product reject ratio is reduced;
3. in the invention, through the treatment of bubbles and dust and the treatment of relevant structures on the plastic suction machine, such as modification of a mould (height reduction and round smoothness increase) and addition of an additional pressure mould, adjustment of heating temperature, rounding treatment of a contact position of the plastic suction machine and a plastic product and the like, possible defects of a finished product, such as guy wires, scratches, crystal points, bubbles, water ripples and the like, are greatly reduced, and the probability of defective products is reduced.
Drawings
FIG. 1 is a front view of a blister forming process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, an embodiment of the present invention: a plastic uptake forming processing technology comprises the following steps:
s1: selecting a plastic sheet;
the selected size of the plastic sheet is smaller than that of the plastic sheet for manufacturing the plastic product in the prior art, and the selected thickness of the plastic sheet is larger than that of the plastic sheet for manufacturing the plastic product in the prior art;
because defoaming is carried out in the subsequent steps and flattening is carried out for eliminating holes, the plastic sheet taken at the beginning is smaller and thicker than the plastic sheet required by the plastic product, and thus, after the subsequent flattening, the size and the thickness of the plastic sheet reach the raw material standard for manufacturing the plastic product;
s2: placing the plastic sheet in warm water for heating;
keeping the temperature of the warm water at 70 ℃, firstly heating the warm water to 100 ℃, then cooling to 70 ℃, and heating the plastic sheet at the temperature;
the heating to the boiling state and the cooling to the target temperature are carried out firstly, so that the influence of air existing in water on the plastic sheet is avoided, although the plastic product is in a non-melting state and external air is difficult to enter, the plastic product is heated firstly for eliminating variables, the heating is simpler, and the complexity of the whole operation process is not increased;
because the safety quality requirement of the plastic for medical packaging is higher, the plastic materials are PE and PP materials, the PE plastic can resist the high temperature of about 90 ℃, the PP plastic can resist the high temperature of about 200 ℃, even the plastic can be heated by a microwave oven, and the repeated heating does not have problems, so the heating in the preorder process can not release toxin and is not a common plastic material;
some plastic materials which are not in direct contact with medical products have lower requirements, but the basic requirements of the products are not very high, the products do not need to be processed by the process, and the cost is increased;
s3: placing the heated plastic sheet in a vacuum box, and defoaming in vacuum;
defoaming is to take certain measures to break up the formed foam or reduce the thickness of the foam layer, and the premise of recycling the foam fluid is that a feasible defoaming method is necessary. The common defoaming methods are many and can be divided into a physical defoaming method, a mechanical defoaming method, a chemical defoaming method and a natural defoaming method according to the principle;
however, most of defoaming is aimed at defoaming liquid or fluid, and a physical defoaming method is a defoaming method for breaking foam by changing the viscosity or physical properties of the foam, and the chemical components of the foam are still unchanged, and commonly used methods include a thermal method, a sound wave method, an electric method, a vacuum method and the like; the mechanical defoaming method is to destroy the thin film forming the bubbles, therefore, the bubbles are compressed or impact force is applied, and the bubble film can be broken by utilizing the sharp change of pressure, such as shearing force, compression force, impact force and the like, so as to achieve the purpose of defoaming; the chemical defoaming method is to add chemical agents into the foam base liquid to change certain properties of the foaming agent so as to achieve the purpose of defoaming; the natural defoaming method is caused by liquid seeping along the Plateau interface by utilizing a liquid film between foams, gas diffusion between bubbles and the rupture of a plurality of single bubble films;
therefore, the mechanical defoaming method, the chemical defoaming method and the natural defoaming method are unusable aiming at the plastic material, while the physical defoaming method is more applicable, namely the vacuum method, but in order to avoid the influence of the vacuum state on the plastic sheet, the vacuum degree is strictly controlled, and the defoaming is ensured while the shape of the plastic sheet is not influenced as much as possible;
s4: drying the defoamed plastic sheet to remove surface moisture;
because the surface of the plastic sheet still has certain moisture, the plastic sheet is heated again while the moisture is removed through drying operation; even if no water exists on the surface, the plastic sheet is heated again to be softened when drying is needed, and the plastic sheet can deform under the action of external pressure so as to perform the subsequent steps, so that the drying temperature needs to be controlled;
s5: flattening the plastic sheet defoamed by the S3 by using flattening equipment;
in the vacuum defoaming process, internal bubbles are extruded to form a channel, and the surface is partially deformed due to the vacuum condition, so that the surface needs to be flattened, the internal channel is eliminated, and the surface is flattened; therefore, not only flattening equipment but also rolling equipment can be used, the effect of the rolling equipment is better, but the operation time of the flattening equipment is shorter, and the specific selection is determined according to the actual production requirement;
before flattening, electrostatic adsorption treatment is carried out on the surface of a flattening plate of flattening equipment;
when the surface of the plastic sheet is in a soft state during flattening, dust is directly pressed into the plastic sheet to influence the final plastic finished product if the plastic sheet is not processed, so that the plastic sheet is processed in the early stage;
s6: an electrostatic adsorption structure is arranged at the upper end of a plastic suction mould of the plastic suction machine;
the electrostatic adsorption structure is a rectangular structure without a lower end face, the rest five inner walls of the rectangular structure are provided with electrostatic adsorption plates, the upper end of the electrostatic adsorption structure is provided with a cylinder, and the cylinder is fixed with the plastic sucking machine;
the cylinder controls the lifting of the electrostatic adsorption structure, the cylinder rises before plastic sheets are placed, dust on the surface of the plastic suction mold can be adsorbed, and the cylinder falls after the plastic sheets are placed;
s7: placing the plastic sheet obtained in the step S5 at the upper end of a plastic suction mould of a plastic suction machine, and fixing;
s8: moving the electrostatic adsorption structure of S6 downward;
the electrostatic adsorption structure is completely covered outside the plastic suction mould and the plastic sheet, has the effects of avoiding the influence of external dust on a plastic finished product and adsorbing the dust in a formed space, and can adsorb visible and invisible fine dust without influencing the plastic finished product under the action of the electrostatic adsorption structure;
s9: heating the plastic sheet, and carrying out plastic suction molding;
s10: separating the molded plastic product from the plastic suction mold;
the two-step process of S9 and S10 is the same as the working principle and the working process of the existing plastic suction process;
s11: removing the material edges of the finished plastic product;
the edges are removed by means of a punching die or a cutting machine and a deburring process is carried out, in which there may be plastic burrs on the surface of the cutting location, which have to be processed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. A plastic uptake forming processing technology is characterized by comprising the following steps:
s1: selecting a plastic sheet;
s2: placing the plastic sheet in warm water for heating;
s3: placing the heated plastic sheet in a vacuum box, and defoaming in vacuum;
s4: drying the defoamed plastic sheet to remove surface moisture;
s5: flattening the plastic sheet defoamed by the S3 by using flattening equipment;
s6: an electrostatic adsorption structure is arranged at the upper end of a plastic suction mould of the plastic suction machine;
s7: placing the plastic sheet obtained in the step S5 at the upper end of a plastic suction mould of a plastic suction machine, and fixing;
s8: moving the electrostatic adsorption structure of S6 downward;
s9: heating the plastic sheet, and carrying out plastic suction molding;
s10: separating the molded plastic product from the plastic suction mold;
s11: and removing the material edges of the finished plastic product.
2. The plastic uptake molding process according to claim 1, wherein: in S1, the size of the plastic sheet is smaller than that of the plastic sheet conventionally used for manufacturing the plastic product, and the thickness of the plastic sheet is larger than that of the plastic sheet conventionally used for manufacturing the plastic product.
3. The plastic uptake molding process according to claim 1, wherein: in the step S2, the warm water is maintained at 70 ℃, the warm water is heated to 100 ℃ and then cooled to 70 ℃, and the plastic sheet is heated while maintaining the temperature.
4. The plastic uptake molding process according to claim 1, wherein: in S5, before flattening, electrostatic adsorption treatment is performed on the surface of the flattening plate of the flattening device.
5. The plastic uptake molding process according to claim 1, wherein: and in the S6, the electrostatic adsorption structure is a rectangular structure with a missing lower end face, the rest five inner walls of the rectangular structure are provided with electrostatic adsorption plates, the upper end of the electrostatic adsorption structure is provided with an air cylinder, and the air cylinder is fixed with the plastic uptake machine.
6. The plastic uptake molding process according to claim 1, wherein: in S8, the electrostatic adsorption structure is completely covered outside the plastic suction mold and the plastic sheet.
7. The plastic uptake molding process according to claim 1, wherein: in S11, the edges are removed by a die cutting die or a cutter, and a deburring process is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911162770.5A CN110843196A (en) | 2019-11-25 | 2019-11-25 | Plastic suction forming processing technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911162770.5A CN110843196A (en) | 2019-11-25 | 2019-11-25 | Plastic suction forming processing technology |
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| CN110843196A true CN110843196A (en) | 2020-02-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0329617A2 (en) * | 1988-01-29 | 1989-08-23 | Alberto Filipponi | Method and apparatus for the pneumatic compression moulding of film-covered fibre-reinforced plastic articles |
| CN107521130A (en) * | 2017-09-09 | 2017-12-29 | 常州广裕橡塑科技有限公司 | A kind of automobile-used rubbery foam pressure bulb apparatus |
| CN208962452U (en) * | 2018-08-28 | 2019-06-11 | 苏州勤联塑胶制品有限公司 | A kind of coiled plastic material plastics sucking moulding device |
| CN110341159A (en) * | 2019-07-18 | 2019-10-18 | 义乌市城西机械有限公司 | A kind of interval pattern dovetail groove tube head suction pipe machining production line |
-
2019
- 2019-11-25 CN CN201911162770.5A patent/CN110843196A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0329617A2 (en) * | 1988-01-29 | 1989-08-23 | Alberto Filipponi | Method and apparatus for the pneumatic compression moulding of film-covered fibre-reinforced plastic articles |
| CN107521130A (en) * | 2017-09-09 | 2017-12-29 | 常州广裕橡塑科技有限公司 | A kind of automobile-used rubbery foam pressure bulb apparatus |
| CN208962452U (en) * | 2018-08-28 | 2019-06-11 | 苏州勤联塑胶制品有限公司 | A kind of coiled plastic material plastics sucking moulding device |
| CN110341159A (en) * | 2019-07-18 | 2019-10-18 | 义乌市城西机械有限公司 | A kind of interval pattern dovetail groove tube head suction pipe machining production line |
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Application publication date: 20200228 |