CN112810116B - Plastic sucking processing method and product - Google Patents
Plastic sucking processing method and product Download PDFInfo
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- CN112810116B CN112810116B CN202011591499.XA CN202011591499A CN112810116B CN 112810116 B CN112810116 B CN 112810116B CN 202011591499 A CN202011591499 A CN 202011591499A CN 112810116 B CN112810116 B CN 112810116B
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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
- B29C51/14—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 using multilayered preforms or sheets
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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
- B29C51/46—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0083—Reflectors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention relates to a plastic sucking processing method and a product thereof. The plastic sucking processing method comprises the following steps of: providing a resin material; preheating the resin material; and performing plastic suction molding on the preheated resin material, wherein a heating system is adopted to heat a plastic suction mold in the plastic suction molding process so as to heat the resin material; the first temperature of the suction molding process is 20 ℃ to 30 ℃ lower than the softening point of the resin material.
Description
Technical Field
The invention relates to the field of plastic sucking processing, in particular to a plastic sucking processing method and a product thereof.
Background
The backlight module is one of the key components of the liquid crystal display panel (Liquid Crystal Display Panel), and has the function of providing enough light sources with uniform brightness and distribution so as to normally display images because the liquid crystal does not emit light.
The reflecting plate is an important component of the backlight mold. In the prior art, a plastic sucking processing method is used for producing the reflecting plate, when the thickness of the reflecting plate is in the range of 0.1mm-0.35mm, the reflecting plate after heat setting is easy to shrink, so that the reflecting plate bulges and wrinkles.
Therefore, a novel plastic sucking processing method is needed, products with the thickness ranging from 0.1mm to 0.35mm can be prepared by using the novel plastic sucking processing method, and the products have smooth surfaces and good mechanical properties.
Disclosure of Invention
In view of the above, it is desirable to provide a method of plastic suction processing and a product thereof.
A method of blister processing comprising the steps of:
providing a resin material;
preheating the resin material; and
carrying out plastic suction molding on the preheated resin material,
wherein, in the plastic suction molding process, a heating system is adopted to heat the plastic suction mold so as to heat the resin material;
the first temperature of the suction molding process is 20 ℃ to 30 ℃ lower than the softening point of the resin material.
In one embodiment, the resin material has a tensile strength of 50Mpa or more and an elongation at break of 40% or more at 90 ℃ to 130 ℃.
In one embodiment, the resin material includes a reflective film having an ABA three-layer structure, the a layer being a support layer, the B layer being a reflective layer.
In one embodiment, the reflective film has a thickness of 0.1mm to 0.55mm.
In one embodiment, the second temperature is 90 ℃ to 130 ℃ during the preheating.
In one embodiment, the first temperature is 50 ℃ to 130 ℃ during the plastic suction molding process.
In one embodiment, the negative pressure value is 5kg-15kg and the treatment time is 6s-20s during the plastic sucking molding process.
In one embodiment, a cooling step is further included after the step of suction molding. In the cooling step, the cooling speed is 20 ℃/min-40 ℃/min.
In the plastic suction molding process of the present invention, the resin material is heated to a temperature in the range of 20 to 30 ℃ lower than the softening point thereof. In this temperature range, the molecular chain of the resin material can be stretched to move under the action of external force, so that the resin material has good formability; meanwhile, the molecular chains of the resin material are oriented under the action of external force, so that the mechanical property of the product can be improved. The resin material is heated by adopting a method of heating the mould, so that the resin material is heated uniformly, and the product with a flat surface is obtained.
An article prepared by the above method, the article being useful in the field of reflective sheeting.
The product provided by the invention has the advantages of thin thickness, good formability and smooth surface, and can improve the light source utilization rate, the display effect of the liquid crystal panel and the economic benefit when the reflecting plate is prepared.
Drawings
Fig. 1 is a preparation flow chart of a method for preparing a reflection plate according to the present invention.
Detailed Description
The present invention will be further described in detail below with reference to examples, which are provided to illustrate the objects, technical solutions and advantages of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the present invention MD (Machine Direction) refers to the longitudinal direction, i.e. the feed direction; TD (Transverse Direction) refers to the transverse, i.e. perpendicular, direction to the feed.
In the present invention, the reflective film is a film-like resin material that can be curled and accommodated. The reflecting plate is a finished product formed by plastic suction, has certain structure/mechanical rigidity and can keep non-deformation for a long time at normal temperature.
The invention provides a plastic sucking processing method, which comprises the following steps:
s1, providing a resin material;
s2, preheating the resin material; and
s3, carrying out plastic suction molding on the preheated resin material.
In the plastic suction molding process, a heating system is adopted to heat the plastic suction mold so as to heat the resin material; the first temperature of the suction molding process is 20 ℃ to 30 ℃ lower than the softening point of the resin material.
In one embodiment, the resin material has a tensile strength of 50Mpa or more and an elongation at break of 40% or more at 90 ℃ to 130 ℃. In view of the film having a deformation ratio in a controllable range, it is preferable that the reflective film has a Machine Direction (MD) heat shrinkage of 0.5% or less and a Transverse Direction (TD) heat shrinkage of 0.2% or less at a temperature of 90 ℃ to 105 ℃. The above temperature conditions mean that the mechanical properties of the material can meet the requirement at any one of the test temperatures in the corresponding temperature ranges.
In one embodiment, the resin material includes a reflective film having an ABA type three-layer structure, the a layer is a support layer, and the B layer is a reflective layer.
The material of the layer A comprises a first polyester resin, first inorganic particles and toughening resin. The first polyester resin includes at least one of polyethylene terephthalate (PET, polyethylene Terephthalate) and polybutylene terephthalate. The first inorganic particles include at least one of calcium carbonate, silica, titania, and barium sulfate. The toughening resin imparts toughness to the reflective film, and may have good tensile strength and elongation at break. The toughening resin is one of Maleic Anhydride (MAH) grafted polyethylene, maleic Anhydride (MAH) grafted styrene-ethylene-butylene-styrene block copolymer (SEBS, styrene Ethylene Butadiene Styrene) and glycidyl methacrylate (GMA, glycidyl Methacylate) grafted polyolefin elastomer (POE, polyoefin Elastomer). The MAH-grafted polyethylene may be MAH-grafted high density polyethylene (HDPE, high Density Polyethene) or MAH-grafted linear low density polyethylene (LDPE, low Density Polyethene). In order to ensure the toughening effect, the mass fraction of the toughening resin is not less than 0.1%; however, when the addition amount is too high, the effect of the toughening agent is saturated, the improvement of the toughening effect is not obvious when the addition amount is further increased, the reflectivity of the reflecting film is reduced when the addition amount is too high, and the mass fraction of the toughening resin is not more than 2%. The mass fraction of the first polyester resin in the layer A is 97% -98.9% based on the mass of the layer A; the mass fraction of the first inorganic particles is 1%; the mass fraction of the toughening resin is 0.1% -2%. Preferably, the mass fraction of the first polyester resin in the supporting layer is 97.5% -98.5%; the mass fraction of the first inorganic particles is 1%; the mass fraction of the toughening resin is 0.5% -1.5%.
The material of the layer B includes a second polyester resin, second inorganic particles, and an incompatible resin. The second polyester resin comprises at least one of polyethylene terephthalate and polybutylene terephthalate. The incompatible resin refers to a resin incompatible with the second polyester resin, and includes polyolefin-based resins. Since the incompatible resin is incompatible with the second polyester resin, voids can be generated around the incompatible resin during stretching, thereby forming cells in the reflective layer. At this point, the incompatible resin may be considered to be substantially centered in the cells. In order to facilitate the formation of the cells, the incompatible resin is preferably at least one of polypropylene, polymethylpentene, cycloolefin copolymer having a small critical surface tension. The particle size of the incompatible resin is not limited, but is preferably 0.2 μm to 0.3. Mu.m. The presence of the cells can increase the reflectivity of the reflective film. The pore size of the cells is not limited, but is preferably 0.3 μm to 5. Mu.m. The second inorganic particles include at least one of titanium dioxide, barium sulfate, calcium carbonate, and aluminum oxide. Preferably, the second inorganic particle is titanium dioxide, because titanium dioxide has good physical and chemical stability, high refractive index, good shielding property, and can provide higher reflectivity.
In one embodiment, the reflective film may be a foamed reflective film. The thickness of the reflective film is 0.1mm to 0.55mm, preferably 0.1mm to 0.35mm.
In the present invention, when the second temperature during preheating is too low, the preheating of the resin material is insufficient, the formability of the product is poor, the second temperature is too high, the resin material may be decomposed, and energy waste may be caused. In one embodiment, the second temperature is from 90 ℃ to 130 ℃, preferably from 110 ℃ to 130 ℃.
In one embodiment, the heating system of the suction molding process includes at least one heating assembly, the temperature of each heating assembly being individually controlled by a PLC electronic control system. In one embodiment, the heating unit of the heating system is a ceramic infrared heating tile, and is matched with a PLC (programmable logic controller) electric control system, so that the temperature of each ceramic infrared heating tile can be accurately and respectively adjusted, and the heating temperature of each part of the die can be adjusted according to the requirement, so that a reflecting plate with a smooth surface can be obtained.
In the invention, in the plastic sucking molding process, the first temperature is too low, the molecular chain of the polymer is not easy to move, the molding of the product is not facilitated, and the product formability is poor; if the first temperature is too high, the polymer macromolecules are not easy to orient in the forming process, even if the orientation is generated, the formed orientation structure is relaxed due to the thermal motion of the molecules, and the orientation is released, so that the performance of the polymer cannot be maintained, and the mechanical property of the product is poor. In one embodiment, the first temperature is 50 ℃ to 130 ℃, preferably 70 ℃ to 90 ℃.
In one embodiment, the negative pressure value in the plastic suction molding process is 5kg-12kg. In order to obtain a product with a smooth surface and good formability, the negative pressure value in the plastic sucking forming process is preferably 7kg-10kg.
In the invention, the time of plastic suction molding is too short, which is unfavorable for molding products; the long molding time can cause energy waste and increase production cost. In one embodiment, the duration of the suction moulding process is between 10s and 35s, preferably between 12s and 25s.
In one embodiment, the plastic suction molding process further comprises a cooling step. In the present invention, the cooling step may be selected from natural cooling, air cooling, water cooling, etc., preferably air cooling.
In one embodiment, the cooling is at a rate of 20 ℃/min to 40 ℃/min. In order to obtain a product with a flat surface, the cooling speed is preferably 30-40 ℃ per minute.
The invention also provides a product prepared by the plastic sucking processing method, and the product is a reflecting plate. The reflecting plate provided by the invention has good mechanical properties.
In one embodiment, the reflector plate is shallow dish-shaped with trapezoidal sidewalls and rectangular bottom. The depth of the shallow tray is 5mm-35mm, and the length of the upper edge of the corresponding shallow tray is 250mm-1700mm; the width is 150mm-1100mm; the bottom area of the tray occupies more than 50% of the sum of the bottom area and the side wall area. The thickness of the reflecting plate is 0.1mm to 0.55mm, preferably 0.15mm to 0.35mm.
Example 1
A resin material is provided, wherein the resin material has an ABA three-layer structure, and a layer A is a supporting layer and a layer B is a reflecting layer. The layer A comprises 98.9% of PET resin, 1% of silicon dioxide particles and 0.1% of toughening resin by mass percent based on the total mass of the layer A. The reflective layer included 60% by mass of PET resin (intrinsic viscosity 0.68 dL/g), 20% by mass of polymethylpentene, and 20% by mass of titanium dioxide, based on the total mass of the B layer. Preheating the resin material to 90 ℃, keeping the temperature for 10 seconds, and performing plastic suction molding on a plastic suction machine. The conditions of the plastic suction molding are as follows: the temperature of the plastic suction molding is 50 ℃, the negative pressure value of the plastic suction molding is 8kg, and the time of the plastic suction molding is 10s, so that a preform is obtained. The preform was then cooled by air cooling for 8 seconds to obtain a reflecting plate.
The reflecting plate is in a shallow tray shape and is provided with a trapezoid side wall and a rectangular bottom. The depth of the tray is 23mm, the length of the upper edge of the tray is 957mm, and the width of the upper edge of the tray is 540mm. The thickness of the reflecting plate is 0.188mm, wherein the thickness of the two A layers accounts for 18% of the total thickness, and the thickness of the B layers accounts for 82% of the total thickness.
Example 2-example 45
Substantially the same as the preparation method of example 1 was conducted, and specific reaction conditions were shown in Table 1.
Table 1 specific reaction conditions of examples
The reflective plates prepared in examples 1 to 45 were tested for tensile strength, elongation at break, thermal shrinkage at 85 ℃ and thickness, and specific test results are shown in table 2.
Table 2 properties of the reflection plate
As is clear from tables 1 and 2, a reflector having good formability can be obtained by using the plastic suction molding method of the present invention. Wherein, the longitudinal tensile strength of the prepared reflecting plate is more than 81MPa, and the transverse tensile strength is more than 71MPa; the longitudinal elongation breaking rate is more than 78 percent, and the transverse tensile breaking rate is more than 50 percent; at 85 ℃, the heat shrinkage rate in the transverse direction and the longitudinal direction is less than 0.1 percent, and the heat-resistant composite material has good mechanical property and high temperature resistance.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The plastic sucking processing method is characterized by comprising the following steps of:
providing a resin material;
preheating the resin material; and
carrying out plastic suction molding on the preheated resin material,
wherein, in the plastic suction molding process, a heating system is adopted to heat the plastic suction mold so as to heat the resin material;
the heating system of the plastic sucking molding process comprises at least one heating component, the temperature of each heating component is independently controlled by a PLC electric control system, the first temperature of the plastic sucking molding process is 20-30 ℃ lower than the softening point of the resin material,
the resin material comprises a reflective film with an ABA three-layer structure, wherein the layer A is a supporting layer, the layer B is a reflective layer, the thickness of the reflective film is 0.1mm-0.55mm,
the layer B includes cells having a pore size of 0.3 μm to 5 μm.
2. The method according to claim 1, wherein the resin material has a tensile strength of 50MPa or more and an elongation at break of 40% or more at 90 ℃ to 130 ℃.
3. The method of claim 1, wherein the second temperature is between 90 ℃ and 130 ℃ during the preheating.
4. The method of claim 1, wherein the first temperature is 50 ℃ to 130 ℃ during the forming.
5. The method according to claim 1, wherein the negative pressure value is 5kg to 12kg and the treatment time is 6s to 20s during the plastic suction molding.
6. The method of claim 1, further comprising a cooling step after the step of suction forming.
7. A method of vacuum forming according to claim 1, wherein in the cooling step, the cooling is performed at a rate of 20 ℃/min to 40 ℃/min.
8. An article prepared by the processing method of any one of claims 1-7, wherein the article is applied in the field of reflective sheeting.
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| CN202011591499.XA CN112810116B (en) | 2020-12-29 | 2020-12-29 | Plastic sucking processing method and product |
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| CN202011591499.XA CN112810116B (en) | 2020-12-29 | 2020-12-29 | Plastic sucking processing method and product |
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| CN112810116A CN112810116A (en) | 2021-05-18 |
| CN112810116B true CN112810116B (en) | 2023-04-28 |
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| CN1116573C (en) * | 2000-08-01 | 2003-07-30 | 广东科龙电器股份有限公司 | Manufacture of refrigerator door plank |
| CN106671544B (en) * | 2015-11-09 | 2019-08-20 | 宁波长阳科技股份有限公司 | A kind of preparation method of low heat shrinkage polyester reflective film |
| CN110734630A (en) * | 2019-10-17 | 2020-01-31 | 苏州同舟包装有限公司 | high-toughness PET material for plastic uptake box |
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