CN110920032B - Plastic suction forming process - Google Patents
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- CN110920032B CN110920032B CN201911351554.5A CN201911351554A CN110920032B CN 110920032 B CN110920032 B CN 110920032B CN 201911351554 A CN201911351554 A CN 201911351554A CN 110920032 B CN110920032 B CN 110920032B
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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
- 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
- B29C51/261—Handling means, e.g. transfer means, feeding means
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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
- B29C51/266—Auxiliary operations after the thermoforming operation
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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
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
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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
- B29C51/42—Heating or cooling
- B29C51/427—Cooling of the material with a fluid blast
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
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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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a blister forming process, relates to the technical field of blister processing, and solves the problem that the blank on a die cannot be completely attached to the inside of the die due to the fact that pressing air leakage is easy to occur at the edge of the die, and further the quality of a blister finished product is greatly reduced. A plastic suction molding process comprises the following steps: step one, processing a mould; taking materials and spraying glue; step three, heating and softening; step four, pressing and forming plastics; step five, cooling and forming; and step six, cutting and cleaning. The invention can make the softened plastic belt completely attached in the mould in the actual use process, and has good forming effect.
Description
Technical Field
The invention relates to the technical field of plastic uptake processing, in particular to a plastic uptake forming process.
Background
The plastic uptake product is mainly made of various plastic materials such as high-quality PVC, PET, PP, PS, GAG, flocking and the like, and is used for producing high-grade and various specifications of electronic plastic uptake packages, stationery plastic uptake packages, toy plastic uptake packages, hardware plastic uptake packages, food plastic uptake packages and daily chemical gift handicraft plastic uptake packages.
The Chinese patent application with publication number CN103231505A discloses a plastic uptake manufacturing method, which comprises the following steps: cutting a plastic plate into blanks with proper sizes; clamping the blank on two press frames with the middle hollowed out; putting the pressing frame with the blank pressed tightly into a drying room for constant-temperature softening; installing a mould on a plastic sucking machine, and continuously filling circulating cold water into the mould; pressing the softened blank pressing frame on a plastic suction mould, and covering the softened blank on the mould; carrying out plastic suction on the plastic suction mould by using pneumatic vacuum compression equipment; spraying silicone oil on the surface of the plastic-absorbing part after plastic absorption for cooling treatment; and cutting the cooled plastic sucking piece into a size.
In the above-mentioned application document, install the mould on the plastic uptake machine, and continuous fill into circulation cold water to the mould, in-process to the mould inside constantly dashes into cold water, the mould obtains effectual cooling, even make the mould at the plastic uptake in-process that lasts, the temperature can not be born too high yet, thereby make the mould can play quick cooling effect to the plastic uptake product, product quality also can improve, but the blank after softening is at the refrigerated in-process of plastic uptake, because self deformation, pressfitting gas leakage appears easily in its edge, lead to the blank on the mould can't be attached in the mould completely, the shaping effect is not good, lead to obtaining the off-the-shelf quality greatly reduced of plastic uptake, therefore, need to propose a new scheme and solve above-mentioned problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a plastic suction molding process to solve the technical problems, and the plastic suction molding process can ensure that a softened plastic tape is completely attached in a mold in the application process and has a good molding effect.
In order to achieve the first purpose, the invention provides the following technical scheme:
a plastic suction molding process comprises the following steps:
step one, processing a mold, namely manufacturing a plastic suction mold according to production requirements;
taking materials and spraying glue, spreading the plastic coil, performing pre-pressing according to the size of the plastic suction mold, and uniformly spraying resin glue on the plastic in the pressing range to obtain a pre-treated plastic raw material;
step three, heating and softening, namely conveying the pretreated plastic raw material into an electric furnace oven for heating to obtain a softened plastic belt;
step four, pressing plastic suction, namely conveying the softened plastic tape to the position right above a plastic suction mould, placing a soft backing ring above the sprayed resin adhesive, then pressing the edge of the plastic suction mould, and vacuumizing the plastic suction mould to enable the softened plastic tape to be adsorbed on the plastic suction mould;
step five, cooling and forming, namely cooling and cooling the softened plastic belt in the mold, and demolding to obtain a semi-finished product;
and step six, performing press cutting and cleaning, namely cutting the obtained semi-finished product by using a cutter to remove the waste edges, then placing the semi-finished product on a press cutting machine for press cutting, cleaning the plastic suction piece obtained after the press cutting by using pure water, and drying to obtain the plastic suction finished product.
Through adopting above-mentioned technical scheme, behind the good blister pack mould of processing preparation, carry out pressfitting in advance according to blister pack mould's size, can highlight the pressfitting scope on the corresponding plastics, then evenly spray the resin glue on the plastics of pressfitting scope, and after softening through heating, place soft backing ring in the top that sprays the resin glue earlier, carry out the pressfitting blister again, can utilize the rheological solidification ability of glue and the elasticity extrusion ability of soft backing ring, make blister pack mould edge can keep inseparable with the softened plastic tape, and when the softened plastic tape in the pressfitting scope takes place deformation, can not produce gas leakage in the evacuation process yet, and then make the softened plastic tape after the evacuation not only can be evenly complete attached on the mould, the blister pack finished product shaping that obtains is effectual, whole has good application.
Further preferably, in the second step, the resin adhesive comprises the following components in parts by weight:
20-32 parts of formaldehyde;
5-10 parts of water;
8-14 parts of diethylene glycol;
48-70 parts of melamine;
5-10 parts of a plasticizer;
0.1-0.2 part of curing agent;
0.35-0.65 part of sodium alkyl benzene sulfonate;
4-6 parts of lignin fiber.
Through adopting above-mentioned technical scheme, above-mentioned resin glue has certain temperature toleration, and the bulk flow is good, toughness is good, stability is good, and when the softened plastic tape in the pressfitting within range takes place deformation, this resin glue can play good dispersion and filling effect. Meanwhile, the lignin fiber is organic fiber obtained by chemical treatment of natural wood, has good toughness, dispersibility and chemical stability, enables the mold and the softened plastic strip to have good adsorption and adhesion, is not easy to leak gas in the process of vacuumizing, and further enables the obtained blister finished product to have good quality.
More preferably, the plasticizer in the resin adhesive is any one of dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate and dioctyl phthalate.
By adopting the technical scheme, the dimethyl phthalate, the diethyl phthalate, the di-n-butyl phthalate and the dioctyl phthalate are good plasticizers, the secondary valence bonds among resin molecules can be weakened, the mobility of the resin molecular bonds can be improved, the intermolecular force can be reduced, and the resin adhesive has good fluidity and filling property.
More preferably, in the fourth step, the soft backing ring has a porous structure and a pore size of 40-60 nm.
Through adopting above-mentioned technical scheme, porous structure's soft backing ring has good nature extrusion ability, and sets up its aperture size to 40-60nm, makes soft backing ring in the in-process that combines with the resin adhesive, and the resin adhesive can partly persist in soft backing ring to adjustment that can be timely quick flows, guarantees the compactness of combining between mould edge and the softened plastic strip.
Further preferably, the third step is specifically configured to be heating and softening, and the pretreated plastic raw material is conveyed into an electric furnace oven to be heated at the temperature of 80-100 ℃ for 20-30s, so as to obtain the softened plastic belt.
By adopting the technical scheme, the heating temperature is controlled to be 80-100 ℃, the time is 20-30s, the obtained softened plastic tape has a stable and moderate softening state, good conveying stability can be maintained, and the softened plastic tape can be completely attached to the surface of a plastic suction mold in the pressing and plastic suction process, so that the stability in the processing and production process is greatly improved, and the overall quality of a product is ensured.
Preferably, the fourth step is specifically configured to press-fit the plastic, convey the softened plastic tape to a position right above the plastic suction mold, place the soft backing ring above the sprayed resin glue, press-fit the edge of the plastic suction mold, and vacuumize the plastic suction mold for 5-10s, wherein the vacuum pressure reaches 0.4-0.7mpa, so that the softened plastic tape is adsorbed on the plastic suction mold.
By adopting the technical scheme, after the edges of the plastic suction mold are pressed, the vacuumizing time is controlled to be 5-10s, so that the vacuum pressure reaches 0.4-0.7mpa, the softened plastic strip above the plastic suction mold can be quickly and uniformly deformed and tightly attached to the plastic suction mold, and the plastic suction finished product with good quality can be obtained.
Preferably, the fifth step is specifically set as cooling molding, cooling the softened plastic strip in the mold, cooling by air cooling for 5-10s, spraying cold water at 5-10 ℃ for cooling at a spraying amount of 3-5 g/square meter, drying by hot air at 50-60 ℃ for 5-10s, and demolding to obtain a semi-finished product.
By adopting the technical scheme, the air cooling is firstly carried out for 5-10s, and then the cold water with the temperature of 5-10 ℃ is sprayed for cooling, so that the temperature can be quickly cooled, and the phenomenon that the product is excessively deformed due to quenching and defective products are not facilitated to appear can be avoided; the spraying amount is controlled to be 3-5 g/square meter, so that the surface can be rapidly cooled; then hot air drying is carried out, the drying temperature is 50-60 ℃, the drying time is 5-10s, and the sprayed water is volatilized, so that a semi-finished product with good quality can be obtained; the cooling mode can play a role in quickly cooling, is favorable for improving the processing and production efficiency and is favorable for ensuring the overall quality of the blister finished product.
Preferably, the sixth step is specifically configured as press-cutting and cleaning, the obtained semi-finished product is cut by a cutter to remove waste edges, then the semi-finished product is placed on a press-cutting machine for press-cutting, then the plastic parts obtained after press-cutting are cleaned by pure water, the temperature of the pure water is 30-50 ℃, the flow rate of the pure water cleaning is controlled to be 3-5m/s, and the plastic suction finished product is obtained after drying.
By adopting the technical scheme, the plastic part obtained after the press cutting is cleaned by pure water, dust and impurities adhered to the surface of the plastic part can be removed, the temperature of the pure water is controlled to be 30-50 ℃, the flow rate of the pure water cleaning is controlled to be 3-5m/s, the plastic part is not damaged, a relatively clean plastic uptake finished product can be obtained, and the plastic uptake finished product has good applicability as a whole.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) resin glue is uniformly sprayed on the plastic in the pressing range, after the plastic is heated and softened, a soft backing ring is placed above the sprayed resin glue, then pressing and plastic suction are carried out, the edge of a plastic suction mold and a soft plastic belt can be kept tight by utilizing the rheological curing capacity of the glue and the elastic extrusion capacity of the soft backing ring, and the vacuumized soft plastic belt can be uniformly and completely attached to the mold, so that the obtained plastic suction finished product has a good molding effect;
(2) the soft backing ring is selected to be of a porous structure, the aperture is 40-60nm, the soft backing ring has good extrusion capacity, and the resin adhesive can be partially retained in the soft backing ring in the process of combining the soft backing ring with the resin adhesive and can be adjusted and flowed timely and quickly, so that the tightness of combination between the edge of the die and the soft plastic belt is ensured.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: a plastic uptake forming process is mainly prepared by the following steps:
step one, processing a mold, namely manufacturing a plastic suction mold according to production requirements;
taking materials and spraying glue, spreading the plastic coil, performing pre-pressing according to the size of the plastic suction mold, and uniformly spraying resin glue on the plastic in the pressing range to obtain a pre-treated plastic raw material;
step three, heating and softening, namely conveying the pretreated plastic raw material into an electric furnace oven for heating at the temperature of 90 ℃ for 25s to obtain a softened plastic belt;
step four, pressing plastic suction, namely conveying the softened plastic belt to the position right above a plastic suction mould, placing a soft backing ring above the sprayed resin adhesive, then pressing the edge of the plastic suction mould, vacuumizing the plastic suction mould for 7.5s, wherein the vacuum pressure reaches 0.55mpa, so that the softened plastic belt is adsorbed on the plastic suction mould;
step five, cooling and forming, namely cooling the softened plastic belt in the mold, firstly cooling by air for 7.5s, then spraying cold water at 7.5 ℃ for cooling, wherein the spraying amount is 4 g/square meter, and finally drying by hot air at 55 ℃ for 7.5s to obtain a semi-finished product after demolding;
and step six, performing press cutting and cleaning, namely cutting off the waste edges of the obtained semi-finished product by a cutter, then placing the semi-finished product on a press cutting machine for press cutting, cleaning the plastic suction piece obtained after press cutting by using pure water, controlling the temperature of the pure water to be 40 ℃, controlling the flow rate of the pure water cleaning to be 4m/s, and drying to obtain the plastic suction finished product.
Note: the components and the corresponding parts by weight of the resin adhesive in the second step are shown in table 1, and the resin adhesive is prepared by the following preparation steps: adding formaldehyde, water and diethylene glycol in corresponding parts by weight into a reaction kettle, stirring at a stirring speed of 600rpm for 10min to obtain a mixed solution, adding melamine in corresponding parts by weight into the mixed solution in three times at an interval of 5min each time, continuously stirring, adding dimethyl phthalate and lignin fiber in corresponding parts by weight, stirring at a heat preservation time of 120min, adding a curing agent in corresponding parts by weight, stirring at a heat preservation temperature of 30 ℃ for 12min to obtain a resin adhesive, wherein the curing agent in the resin adhesive component is purchased from Germany Gaoshi and has a brand number of WZ 2275; in the fourth step, the soft backing ring is a porous structure with a pore size of 50 nm.
Example 2: a plastic suction molding process is different from the embodiment 1 in that the plastic suction molding process specifically comprises the following steps:
step one, processing a mold, namely manufacturing a plastic suction mold according to production requirements;
taking materials and spraying glue, spreading the plastic coil, performing pre-pressing according to the size of the plastic suction mold, and uniformly spraying resin glue on the plastic in the pressing range to obtain a pre-treated plastic raw material;
step three, heating and softening, namely conveying the pretreated plastic raw material into an electric furnace oven for heating at the temperature of 80 ℃ for 30s to obtain a softened plastic belt;
step four, pressing plastic suction, namely conveying the softened plastic belt to the position right above a plastic suction mould, placing a soft backing ring above the sprayed resin adhesive, then pressing the edge of the plastic suction mould, vacuumizing the plastic suction mould for 5s, wherein the vacuum pressure reaches 0.7mpa, so that the softened plastic belt is adsorbed on the plastic suction mould;
step five, cooling and forming, namely cooling the softened plastic belt in the mold, firstly cooling the softened plastic belt by air cooling for 5s, then spraying cold water at the temperature of 5 ℃ for cooling, and finally drying the softened plastic belt by hot air at the temperature of 50 ℃ for 10s, wherein the spraying amount is 5 g/square meter;
and step six, performing press cutting and cleaning, namely cutting off the waste edges of the obtained semi-finished product by a cutter, then placing the semi-finished product on a press cutting machine for press cutting, cleaning the plastic suction piece obtained after press cutting by using pure water, controlling the temperature of the pure water to be 30 ℃ and the flow rate of the pure water cleaning to be 5m/s, and drying to obtain the plastic suction finished product.
Example 3: a plastic suction molding process is different from the embodiment 1 in that the plastic suction molding process specifically comprises the following steps:
step one, processing a mold, namely manufacturing a plastic suction mold according to production requirements;
taking materials and spraying glue, spreading the plastic coil, performing pre-pressing according to the size of the plastic suction mold, and uniformly spraying resin glue on the plastic in the pressing range to obtain a pre-treated plastic raw material;
step three, heating and softening, namely conveying the pretreated plastic raw material into an electric furnace oven for heating at the temperature of 100 ℃ for 20s to obtain a softened plastic belt;
step four, pressing plastic suction, namely conveying the softened plastic belt to the position right above a plastic suction mould, placing a soft backing ring above the sprayed resin adhesive, then pressing the edge of the plastic suction mould, vacuumizing the plastic suction mould for 10s, wherein the vacuum pressure reaches 0.4mpa, so that the softened plastic belt is adsorbed on the plastic suction mould;
step five, cooling and forming, namely cooling the softened plastic belt in the mold, cooling the softened plastic belt by air cooling for 10s, spraying cold water at 10 ℃ for cooling, drying the softened plastic belt by hot air at 60 ℃ for 5s, and demolding to obtain a semi-finished product;
and step six, performing press cutting and cleaning, namely cutting off the waste edges of the obtained semi-finished product by a cutter, then placing the semi-finished product on a press cutting machine for press cutting, cleaning the plastic suction piece obtained after press cutting by using pure water, controlling the temperature of the pure water to be 50 ℃, controlling the flow rate of the pure water cleaning to be 3m/s, and drying to obtain the plastic suction finished product.
Examples 4 to 5: a plastic suction molding process is different from the embodiment 1 in that the components and the corresponding parts by weight of the resin adhesive in the second step are shown in the table 1.
TABLE 1 Components and parts by weight of examples 1-5
Example 6: a plastic suction molding process is different from the embodiment 1 in that in the second step, dimethyl phthalate and other substances in resin glue are replaced by diethyl phthalate.
Example 7: a plastic suction molding process is different from the embodiment 1 in that in the second step, dimethyl phthalate and other mass in resin glue are replaced by dioctyl phthalate.
Example 8: a plastic uptake forming process is different from the embodiment 1 in that in the second step, dimethyl phthalate and other mass in resin glue are replaced by di-n-butyl phthalate.
Example 9: a plastic uptake forming process is different from the embodiment 1 in that in the fourth step, the soft backing ring is in a porous structure, and the pore size is 40 nm.
Example 10: a plastic uptake forming process is different from the embodiment 1 in that in the fourth step, the soft backing ring is in a porous structure, and the pore size is 60 nm.
Comparative example 1: a plastic suction molding process is different from the embodiment 1 in that in the fourth step, the soft backing ring is of a porous structure, and the pore size is 35 nm.
Comparative example 2: a plastic suction molding process is different from the embodiment 1 in that in the fourth step, the soft backing ring is of a porous structure, and the pore size is 65 nm.
Comparative example 3: a plastic suction molding process is different from the embodiment 1 in that in the fourth step, the soft backing ring is of a solid structure.
Comparative example 4: a plastic suction molding process is different from the embodiment 1 in that the plastic suction molding process is mainly prepared by the following steps:
s1, processing the mold, and manufacturing a plastic suction mold according to the production requirement;
s2, taking materials, spraying glue, and spreading the plastic roll;
s3, heating and softening, conveying the spread plastic roll into an electric furnace oven for heating at 90 ℃ for 25S to obtain a softened plastic belt;
s4, pressing and sucking plastic, conveying the softened plastic tape to the position right above a plastic suction mould, placing a soft backing ring above the sprayed resin adhesive, then pressing the edge of the plastic suction mould, vacuumizing the plastic suction mould for 7.5S, wherein the vacuum pressure reaches 0.55mpa, so that the softened plastic tape is adsorbed on the plastic suction mould;
s5, cooling and forming, namely cooling the softened plastic tape in the mold, firstly cooling by air for 7.5S, then spraying cold water at 7.5 ℃ for cooling, wherein the spraying amount is 4 g/square meter, and finally drying by hot air at 55 ℃ for 7.5S to obtain a semi-finished product after demolding;
and S6, performing press cutting and cleaning, cutting the obtained semi-finished product by a cutter to remove waste edges, then placing the semi-finished product on a press cutting machine for press cutting, cleaning the plastic suction piece obtained after press cutting by pure water, controlling the temperature of the pure water to be 40 ℃, controlling the flow rate of the pure water cleaning to be 4m/S, and drying to obtain the plastic suction finished product.
Performance test samples: a PET blister roll material sold by Wei Bao plastics Co., Ltd, available in Dongguan was 1.2mm in thickness.
The test method comprises the following steps: processing the test samples according to the blister forming process in the embodiments 1 to 8 and the comparative examples 1 to 4, wherein the blister molds obtained by the intermediate processing are the same, respectively producing 100 blister finished products, and according to the standard: file number of Shenzhen Shanghnli paper packaging Limited company, QW20 file version, effective date of 2013-02-01 in the inspection standard of Shenzhen Shanghili paper packaging Limited company, respectively detecting the molding effect of the plastic-absorbing finished product, calculating the defective rate, and recording.
And (3) test results: the test results of examples 1 to 10 and comparative examples 1 to 4 are shown in Table 2. As can be seen from Table 2, the comparison of the test results of examples 1-3 and comparative example 3 shows that the defective rate of the blister finished product can be greatly reduced by uniformly spraying resin glue on the plastic in the laminating range, placing a soft backing ring above the sprayed resin glue after heating and softening, and then performing lamination blister. From the comparison of the test results of the embodiment 1 and the embodiments 4 to 10, the component proportions of the resin adhesive, the plasticizer in the resin adhesive and the aperture selection of the soft backing ring disclosed by the invention are all suitable for the plastic suction molding process, and the defective rate of the obtained plastic suction finished product is low and stable. The comparison of the test results of the embodiment 1 and the comparative examples 1 to 3 shows that the soft backing ring with a porous structure is selected, the pore size is controlled to be 40 to 60nm, and the defective rate in the application and production process of the plastic suction molding process can be greatly reduced.
TABLE 2 test results of examples 1 to 10 and comparative examples 1 to 4
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A plastic suction molding process is characterized by comprising the following steps:
step one, processing a mold, namely manufacturing a plastic suction mold according to production requirements;
taking materials and spraying glue, spreading the plastic coil, performing pre-pressing according to the size of the plastic suction mold, and uniformly spraying resin glue on the plastic in the pressing range to obtain a pre-treated plastic raw material;
step three, heating and softening, namely conveying the pretreated plastic raw material into an electric furnace oven for heating to obtain a softened plastic belt;
step four, pressing plastic suction, namely conveying the softened plastic tape to the position right above a plastic suction mould, placing a soft backing ring above the sprayed resin adhesive, then pressing the edge of the plastic suction mould, and vacuumizing the plastic suction mould to enable the softened plastic tape to be adsorbed on the plastic suction mould;
step five, cooling and forming, namely cooling and cooling the softened plastic belt in the mold, and demolding to obtain a semi-finished product;
step six, press cutting and cleaning, namely cutting the waste edges of the obtained semi-finished product by a cutter, then placing the semi-finished product on a press cutting machine for press cutting, cleaning the plastic suction piece obtained after press cutting by pure water, and drying to obtain a plastic suction finished product;
in the second step, the resin adhesive comprises the following components in parts by weight:
20-32 parts of formaldehyde;
5-10 parts of water;
8-14 parts of diethylene glycol;
48-70 parts of melamine;
5-10 parts of a plasticizer;
0.1-0.2 part of curing agent;
0.35-0.65 part of sodium alkyl benzene sulfonate;
4-6 parts of lignin fiber;
in the fourth step, the soft backing ring is of a porous structure, and the pore size is 40-60 nm.
2. The blister molding process according to claim 1, wherein the plasticizer in the resin adhesive is any one of dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate and dioctyl phthalate.
3. The plastic suction molding process of claim 1, wherein the third step is specifically configured to heat and soften, and the pretreated plastic material is conveyed into an electric oven to be heated at 80-100 ℃ for 20-30s to obtain the softened plastic strip.
4. The plastic suction molding process of claim 1, wherein the fourth step is specifically configured to press-fit the plastic suction, convey the softened plastic tape directly over the plastic suction mold, place a soft backing ring over the sprayed resin glue, press-fit the edge of the plastic suction mold, and vacuumize the plastic suction mold for 5-10s at a vacuum pressure of 0.4-0.7 mpas to make the softened plastic tape adsorbed on the plastic suction mold.
5. The plastic suction molding process according to claim 1, wherein the fifth step is specifically configured as cooling molding, cooling the softened plastic tape in the mold, cooling by air cooling for 5-10s, spraying cold water at 5-10 ℃ for cooling with a spraying amount of 3-5 g/square meter, drying by hot air at 50-60 ℃ for 5-10s, and demolding to obtain a semi-finished product.
6. The blister forming process according to claim 1, wherein the sixth step is specifically configured as a press-cutting cleaning step, in which the obtained semi-finished product is cut off waste edges by a cutter, the semi-finished product is placed on a press-cutting machine for press-cutting, then the blister obtained after press-cutting is cleaned by pure water, the temperature of the pure water is 30-50 ℃, the flow rate of the pure water cleaning is controlled to be 3-5m/s, and the blister finished product is obtained after drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911351554.5A CN110920032B (en) | 2019-12-25 | 2019-12-25 | Plastic suction forming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911351554.5A CN110920032B (en) | 2019-12-25 | 2019-12-25 | Plastic suction forming process |
Publications (2)
| Publication Number | Publication Date |
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| CN110920032A CN110920032A (en) | 2020-03-27 |
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