WO2020143821A1 - Heat transfer printing method for precise film adhering - Google Patents
Heat transfer printing method for precise film adhering Download PDFInfo
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- WO2020143821A1 WO2020143821A1 PCT/CN2020/071633 CN2020071633W WO2020143821A1 WO 2020143821 A1 WO2020143821 A1 WO 2020143821A1 CN 2020071633 W CN2020071633 W CN 2020071633W WO 2020143821 A1 WO2020143821 A1 WO 2020143821A1
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- lamination
- film
- product
- preset
- thermal transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
- B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
- B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
- B44C1/17—Dry transfer
Definitions
- the invention relates to the technical field of processing and manufacturing, in particular to a thermal transfer method for precision film sticking.
- the base material of the product gradually changes from the original colored plastic to many materials such as ceramics, transparent synthetic plates, transparent PC, transparent glass, and even transparent sapphire, and the shape of the product also changes from the original single plane, 2.5 D shape changes to various complex curved surfaces.
- complex curved products will become the mainstream, and the traditional thermal transfer method can no longer meet the requirements of products with complex curved surfaces such as explosion-proof performance, anti-wrinkle, anti-marking, anti-bubble, and precision of bonding.
- enterprises have a low product yield rate during the process of thermal transfer processing. Therefore, the existing thermal transfer method has a problem of low yield rate.
- the object of the present invention is to provide a thermal transfer method for precision lamination, aiming to solve the problem of low processing yield in the thermal transfer method of the prior art.
- a thermal transfer method for precision lamination which includes:
- the decorative film with the transparent adhesive glue is precisely die cut to obtain a pre-laminated film
- the pre-laminated film and the product that have been pre-laminated and fixed or the vacuum-sealed bag are placed in a gaseous medium with a preset temperature and a preset pressure for a preset time to pass the temperature of the gaseous medium And the pressure to fully adhere the pre-lamination film to the lamination surface of the product;
- the pre-laminated film is tightly cured on the bonding surface of the product by a preset curing device.
- the thermal transfer method for precision film wherein the transparent adhesive and the decorative film are attached to the surface of the base film, the base film is cast polypropylene film, biaxially oriented polypropylene Film or thermoplastic polyurethane film.
- the thermal transfer method for precision lamination film wherein the pre-lamination of the lamination surface of the pre-lamination film to the lamination surface of the product by a pre-lamination device includes:
- the partial pre-lamination of the pre-lamination film is fixed to the lamination surface of the product by the heating device in the pre-lamination device.
- thermo transfer method for precision lamination film wherein after pre-laminating the lower surface of the pre-lamination film to the front surface of the product by a pre-lamination device, further comprising:
- a supporting pad is fixedly arranged on the non-lamination surface of the pre-lamination film and the non-lamination surface of the product.
- the material of the support pad is polyurethane or silica gel.
- the preset temperature is 60-150 degrees Celsius, and the preset pressure is not less than 5 kg/cm 2 .
- the gaseous medium is air, nitrogen or inert gas.
- the preset time is greater than 1 minute.
- the preset curing device is a hot air dryer and/or a UV ultraviolet lamp.
- the method of the present invention obtains a pre-laminated film by precision die-cutting a decorative film attached with a transparent adhesive according to a preset die-cutting size, and fixes the pre-laminated film on the laminating surface of the product, Placing the pre-laminated film and the product that have been pre-laminated and fixed in a gaseous medium having a preset temperature and a preset pressure for a preset time, so that the pre-laminated film is subjected to the temperature and pressure of the gaseous medium Fully fit on the bonding surface of the product, can carry out high-precision thermal transfer processing on flat and complex curved products, greatly improving the yield of decorative and explosion-proof processing on the outer surface of the product, obtained in the actual application process Good effect.
- FIG. 1 is a schematic flowchart of a thermal transfer method for precision lamination of the present invention.
- the present invention provides a thermal transfer method for precision film sticking. To make the objectives, technical solutions, and effects of the present invention clearer and more specific, the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
- FIG. 1 is a schematic flowchart of a thermal transfer method for precision lamination of the present invention. As shown in the figure, a thermal transfer method for precision lamination includes steps S110-S160.
- the product is the product to be decorated or to be subjected to explosion-proof treatment, that is, the thermal transfer method used for precision lamination in this case can realize the decoration of the product and/or the explosion-proof treatment of the product.
- the bonding surface of the product is the side used to bond the pre-laminated film, and the non-lamination surface of the product is the back of the product; the bonding surface of the pre-lamination film is the transparent adhesive.
- the non-laminated surface of the pre-laminated film is the side of the pre-laminated film to which no transparent adhesive is attached.
- Both the transparent adhesive and the decorative film are attached to the surface of the base film, and the specific attachment methods can be divided into two types: attach the decorative film and the transparent adhesive to the same surface of the base film, or attach the decoration
- the film and the transparent adhesive are attached to the upper and lower surfaces of the base film, respectively.
- the decorative film can be attached to the lower surface of the base film, and the transparent adhesive can be attached to the upper surface of the decorative film, so that the decorative film and the transparent adhesive can be attached to the same surface of the base film at the same time;
- the decorative film can be attached to the upper surface of the base film, and the transparent adhesive can be attached to the lower surface of the base film, so that the decorative film and the transparent adhesive can be attached to the two surfaces of the base film respectively.
- the base film has good ductility
- the base film may be one of cast polypropylene (CPP) film, biaxially oriented polypropylene (OPP) film or thermoplastic polyurethane (TPU) film, or other with good ductility Film.
- the thickness of the base film is 0.04-0.15 mm.
- the transparent adhesive can be applied to the surface of the base film by coating or pasting.
- the transparent adhesive is not sticky at room temperature. Only under a certain temperature and pressure environment can the transparent adhesive be firmly adhered to the product. surface.
- the preset decorative film can be attached to the surface of the base film by various methods, and the preset decorative film can be attached to the surface of the base film by UV transfer, electroplating, screen printing, offset printing, or letterpress printing.
- the pre-lamination equipment includes a pre-alignment device and a heating device.
- step S120 specifically includes: precisely positioning the bonding surface of the pre-lamination film and the bonding surface of the product through a pre-alignment device in the pre-lamination device;
- the heating device in the bonding equipment fixes the partial pre-lamination of the pre-lamination film to the lamination surface of the product.
- the pre-alignment device is a device for precisely aligning the pre-laminated film and the product.
- the pre-laminated film and the product are heated by the heating device, and the pre-laminated film can be partially fixed on the bonding surface of the product In order to achieve the effect of local fixation, that is, to achieve the pre-lamination film pre-lamination fixed to the product bonding surface.
- the method further includes: fixing a supporting pad on the non-lamination surface of the pre-lamination film and the non-lamination surface of the product.
- a support pad can be fixed at the corresponding position on the back of the product, and a support pad can be fixed on the upper surface of the pre-laminated film.
- the support pad can be made of a softer material, for example, polyurethane or silicone can be used as the material of the support pad.
- the bending angle threshold can be set according to the needs of the user, and the bending angle can be set to 20°-45° in actual use. If the bending angle of the product is greater than the bending angle threshold, the pre-laminated film and product that have been pre-laminated are placed in a sealed bag; if the bending angle of the product is not greater than the bending angle threshold, the pre-laminated film and The product is placed in a sealed bag.
- S140 Place the pre-laminated film and the product that have been pre-laminated and fixed or the vacuum-sealed bag in a gaseous medium with a preset temperature and a preset pressure for a preset time to pass the gaseous medium The temperature and pressure of the pre-lamination film are fully applied to the bonding surface of the product.
- the pre-laminated film and product that have been pre-laminated are directly placed in the gaseous medium at the preset temperature and pressure; if the pre-laminated film and product are When it is placed in a sealed bag, the sealed bag with the pre-laminated film and product is placed in a gaseous medium at a preset temperature and preset pressure.
- the preset temperature is 60-150 degrees Celsius
- the preset pressure is not less than 5 kg/cm 2
- the preset time is more than 1 minute
- the gaseous medium is air, nitrogen, or inert gas.
- a tightness detection device to obtain the tightness of the bonding of the pre-laminated film and the product, and the tightness of the bonding of the pre-laminated film and the product and the preset tightness threshold are judged.
- the tightness of the bonding film to the product is greater than the preset tightness threshold value, indicating that the pre-lamination film product has been closely bonded; if the tightness of the pre-lamination film and product bonding is not greater than the tightness threshold value, it indicates The pre-laminated film products are not tightly bonded yet, and the pre-laminated film needs to be processed by other devices.
- the pre-laminated film is tightly cured to the bonding surface of the product by a preset curing device.
- the curing device may be a hot air dryer or a UV ultraviolet lamp, and a curing device may be obtained by combining the hot air dryer and the UV ultraviolet lamp to cure the pre-laminated film.
- the UV light is generated by the UV lamp to cure the pre-laminated film, which can greatly enhance the chemical corrosion resistance of the pre-laminated film after lamination.
- the decorative film is firmly bonded to the surface of the product. It is suitable for flat and complex curved products. It can avoid bubbles or wrinkles during the bonding of the decorative film, avoid scratching the outer surface of the product, and avoid lamination. The product is damaged, which greatly improves the yield rate of the product during the thermal transfer process.
- the method of the present invention obtains a pre-laminated film by precision die-cutting a decorative film attached with a transparent adhesive according to a preset die-cutting size, and fixes the pre-laminated film on the laminating surface of the product, Placing the pre-laminated film and the product that have been pre-laminated and fixed in a gaseous medium having a preset temperature and a preset pressure for a preset time, so that the pre-laminated film is subjected to the temperature and pressure of the gaseous medium Fully fit on the bonding surface of the product, can carry out high-precision thermal transfer processing on flat and complex curved products, greatly improving the yield of decorative and explosion-proof processing on the outer surface of the product, obtained in the actual application process Good effect.
Abstract
A heat transfer printing method for precise film adhering. Said method in the present invention comprises: performing, according to a preset mold cutting size, precise mold cutting on a decorative film having a transparent adhesive adhered thereon to obtain a pre-adhering thin film; fixedly pre-adhering the pre-adhering thin film to an adhering surface of a product; and placing the pre-adhering thin film and the product, which have been fixedly pre-adhered together, in a gaseous medium having a preset temperature and a preset pressure for a preset duration, so as to fully adhere the pre-adhering thin film to the adhering surface of the product by means of the temperature and pressure of the gaseous medium. High-precision heat transfer printing processing can be performed on products having flat surfaces and complex curved surfaces, increasing the yield in decoration and explosion-proof processing on the outer surfaces of the products, and achieving a good effect during practical application.
Description
本发明涉及加工制造技术领域，尤其涉及一种用于精密贴膜的热转印方法。The invention relates to the technical field of processing and manufacturing, in particular to a thermal transfer method for precision film sticking.
随着数字科技的提高与广泛应用，消费性电子数码产品、家电用品、汽车内外零配件的装饰和防爆保护应用范围越来越广泛，这些产品的表面均需要进行装饰和防爆保护。With the improvement and wide application of digital technology, the application range of decoration and explosion-proof protection of consumer electronic digital products, home appliances, automotive internal and external parts and accessories is becoming more and more extensive, and the surfaces of these products need to be decorated and protected by explosion-proof protection.
而在上述产品中，产品的基材由原来的有色塑胶，逐步向陶瓷、透明合成板材、透明PC、透明玻璃，甚至透明蓝宝石等诸多材料过渡，而且产品的形状也由原来单一的平面、2.5D外形，向各种复杂曲面转变。今后一段时间，复杂曲的产品会成为主流，而传统的热转印方法已无法发满足具有复杂曲面的产品对防爆性能、抗褶皱、抗压痕、抗气泡、贴合精密度等诸多方面的需要，导致企业在进行热转印加工的过程中产品良品率较低，因而现有的热转印方法存在良品率较低的问题。In the above products, the base material of the product gradually changes from the original colored plastic to many materials such as ceramics, transparent synthetic plates, transparent PC, transparent glass, and even transparent sapphire, and the shape of the product also changes from the original single plane, 2.5 D shape changes to various complex curved surfaces. In the future, complex curved products will become the mainstream, and the traditional thermal transfer method can no longer meet the requirements of products with complex curved surfaces such as explosion-proof performance, anti-wrinkle, anti-marking, anti-bubble, and precision of bonding. As a result, enterprises have a low product yield rate during the process of thermal transfer processing. Therefore, the existing thermal transfer method has a problem of low yield rate.
发明内容Summary of the invention
针对现有技术的不足，本发明的目的在于提供一种用于精密贴膜的热转印方法，旨在解决现有技术中的热转印方法所存在的加工良品率不高的问题。In view of the shortcomings of the prior art, the object of the present invention is to provide a thermal transfer method for precision lamination, aiming to solve the problem of low processing yield in the thermal transfer method of the prior art.
本发明通过如下技术方案实现：The present invention is achieved through the following technical solutions:
一种用于精密贴膜的热转印方法，其中，包括：A thermal transfer method for precision lamination, which includes:
根据预设的模切尺寸对贴附有透明粘合胶的装饰膜进行精密模切以得到预贴合薄膜；According to the preset die cutting size, the decorative film with the transparent adhesive glue is precisely die cut to obtain a pre-laminated film;
通过预贴合设备将述预贴合薄膜的贴合面预贴合固定于产品的贴合面；Pre-laminate the bonding surface of the pre-lamination film to the bonding surface of the product through pre-lamination equipment;
对所述产品的弯曲角度是否大于预设的弯曲角度阈值进行判断，若所述产品的弯曲角度大于所述弯曲角度阈值，将已预贴合固定的所述预贴合薄膜及所述产品放置于密封袋并对所述密封袋抽真空；Determine whether the bending angle of the product is greater than a preset bending angle threshold, and if the bending angle of the product is greater than the bending angle threshold, place the pre-laminated film and the product that have been pre-laminated and fixed To seal the bag and evacuate the sealed bag;
将已预贴合固定的所述预贴合薄膜及所述产品或已抽真空的所述密封袋置于具有预设温度及预设压强的气态介质中预设时间，以通过气态介质的温度和压力将所述预贴合薄膜全面贴合于所述产品的贴合面；The pre-laminated film and the product that have been pre-laminated and fixed or the vacuum-sealed bag are placed in a gaseous medium with a preset temperature and a preset pressure for a preset time to pass the temperature of the gaseous medium And the pressure to fully adhere the pre-lamination film to the lamination surface of the product;
将已预贴合固定的所述预贴合薄膜及所述产品置于具有预设温度及预设压强的气态介质中预设时间，以通过气态介质的温度和压力将所述预贴合薄膜全面贴合于所述产品的贴合面；Placing the pre-laminated film and the product that have been pre-laminated and fixed in a gaseous medium having a preset temperature and a preset pressure for a preset time, so that the pre-laminated film is subjected to the temperature and pressure of the gaseous medium Fully fit on the fitting surface of the product;
对所述预贴合薄膜与所述产品贴合的紧密度是否大于预设的紧密度阈值进行判断；Determine whether the tightness of the pre-laminated film and the product is greater than a preset tightness threshold;
若预贴合薄膜与所述产品贴合的紧密度不大于所述紧密度阈值，通过预设固化装置将所述预贴合薄膜紧密固化于所述产品的贴合面。If the tightness of the bonding between the pre-laminated film and the product is not greater than the tightness threshold, the pre-laminated film is tightly cured on the bonding surface of the product by a preset curing device.
所述的用于精密贴膜的热转印方法，其中，所述透明粘合胶及所述装饰膜均贴附于基膜表面，所述基膜为流延聚丙烯薄膜、双向拉伸聚丙烯薄膜或热可塑性聚氨酯薄膜。The thermal transfer method for precision film, wherein the transparent adhesive and the decorative film are attached to the surface of the base film, the base film is cast polypropylene film, biaxially oriented polypropylene Film or thermoplastic polyurethane film.
所述的用于精密贴膜的热转印方法，其中，所述通过预贴合设备将述预贴合薄膜的贴合面预贴合固定于产品的贴合面包括：The thermal transfer method for precision lamination film, wherein the pre-lamination of the lamination surface of the pre-lamination film to the lamination surface of the product by a pre-lamination device includes:
通过所述预贴合设备中的预对位装置对所述预贴合薄膜的贴合面与所述产品的贴合面进行精密对位；Precisely align the bonding surface of the pre-lamination film with the bonding surface of the product through a pre-alignment device in the pre-lamination equipment;
通过所述预贴合设备中的加热装置将所述预贴合薄膜的局部预贴合固定于所述产品的贴合面。The partial pre-lamination of the pre-lamination film is fixed to the lamination surface of the product by the heating device in the pre-lamination device.
所述的用于精密贴膜的热转印方法，其中，所述通过预贴合设备将述预贴合薄膜的下表面预贴合固定于产品的正面之后，还包括：The thermal transfer method for precision lamination film, wherein after pre-laminating the lower surface of the pre-lamination film to the front surface of the product by a pre-lamination device, further comprising:
在所述预贴合薄膜的非贴合面及所述产品的非贴合面固定设置支撑垫。A supporting pad is fixedly arranged on the non-lamination surface of the pre-lamination film and the non-lamination surface of the product.
所述的用于精密贴膜的热转印方法，其中，所述支撑垫的材质为聚氨基甲酸酯或硅胶。In the thermal transfer method for precision film sticking, the material of the support pad is polyurethane or silica gel.
所述的用于精密贴膜的热转印方法，其中，所述预设温度为60-150摄氏度，所述预设压强不小于5kg/cm
2。
According to the thermal transfer method for precision film sticking, the preset temperature is 60-150 degrees Celsius, and the preset pressure is not less than 5 kg/cm 2 .
所述的用于精密贴膜的热转印方法，其中，所述气态介质为空气、氮气或惰性气体。In the thermal transfer method for precision film sticking, the gaseous medium is air, nitrogen or inert gas.
所述的用于精密贴膜的热转印方法，其中，所述预设时间大于1分钟。In the thermal transfer method for precision film sticking, the preset time is greater than 1 minute.
所述的用于精密贴膜的热转印方法，其中，所述预设固化装置为热风干燥机和/或UV紫外灯。According to the thermal transfer method for precision film sticking, the preset curing device is a hot air dryer and/or a UV ultraviolet lamp.
本发明方法通过根据预设的模切尺寸对贴附有透明粘合胶的装饰膜进行精密模切以得到预贴合薄膜，并将预贴合薄膜预贴合固定在产品的贴合面，将已预贴合固定的所述预贴合薄膜及所述产品置于具有预设温度及预设压强的气态介质中预设时间，以通过气态介质的温度和压力将所述预贴合薄膜全面贴合于所述产品的贴合面，可在平面及复杂曲面的产品进行高精度热转印加工，大幅提高了对产品外表面进行装饰及防爆加工的良品率，在实际应用过程中取得了良好的效果。The method of the present invention obtains a pre-laminated film by precision die-cutting a decorative film attached with a transparent adhesive according to a preset die-cutting size, and fixes the pre-laminated film on the laminating surface of the product, Placing the pre-laminated film and the product that have been pre-laminated and fixed in a gaseous medium having a preset temperature and a preset pressure for a preset time, so that the pre-laminated film is subjected to the temperature and pressure of the gaseous medium Fully fit on the bonding surface of the product, can carry out high-precision thermal transfer processing on flat and complex curved products, greatly improving the yield of decorative and explosion-proof processing on the outer surface of the product, obtained in the actual application process Good effect.
图1为本发明的用于精密贴膜的热转印方法的流程示意图。FIG. 1 is a schematic flowchart of a thermal transfer method for precision lamination of the present invention.
本发明提供用于精密贴膜的热转印方法，为使本发明的目的、技术方案及效果更加清楚、明确，以下对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。The present invention provides a thermal transfer method for precision film sticking. To make the objectives, technical solutions, and effects of the present invention clearer and more specific, the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
请参阅图1，图1为本发明的用于精密贴膜的热转印方法的流程示意图。如图所示，一种用于精密贴膜的热转印方法，包括步骤S110-S160。Please refer to FIG. 1. FIG. 1 is a schematic flowchart of a thermal transfer method for precision lamination of the present invention. As shown in the figure, a thermal transfer method for precision lamination includes steps S110-S160.
S110、根据预设的模切尺寸对贴附有透明粘合胶的装饰膜进行精密模切以得到预贴合薄膜。具体的，可根据产品的外部尺寸获取对应的模切尺寸，并根据模切尺寸对预贴合薄膜的局部尺寸进行调整，以使进行精密模切后的预贴合薄膜与产品的贴合面相吻合。S110. Precisely die-cut the decorative film attached with the transparent adhesive according to the preset die-cutting size to obtain a pre-laminated film. Specifically, the corresponding die-cutting size can be obtained according to the external dimensions of the product, and the local size of the pre-laminated film can be adjusted according to the die-cutting size, so that the pre-laminated film after precision die cutting and the bonding surface of the product Agree.
产品即是待装饰或待进行防爆处理的产品，也即是本案中所采用的用于精密贴膜的热转印方法可实现对产品进行装饰和/或对产品进行防爆处理。产品的贴合面也即是用于贴合预贴合薄膜的一面，产品的非贴合面也即是产品的背面；预贴合薄膜的贴合面也即是贴附有透明粘合胶的一面，预贴合薄膜的非贴合面也即是预贴合薄膜未贴附透明粘合胶的一面。The product is the product to be decorated or to be subjected to explosion-proof treatment, that is, the thermal transfer method used for precision lamination in this case can realize the decoration of the product and/or the explosion-proof treatment of the product. The bonding surface of the product is the side used to bond the pre-laminated film, and the non-lamination surface of the product is the back of the product; the bonding surface of the pre-lamination film is the transparent adhesive. The non-laminated surface of the pre-laminated film is the side of the pre-laminated film to which no transparent adhesive is attached.
所述透明粘合胶及所述装饰膜均贴附于基膜表面，具体的贴附方式可分为两种，将装饰膜及透明粘合胶贴附于基膜的同一表面，或将装饰膜及透明粘合胶分别贴附于基膜的上表面及下表面。具体的，可将装饰膜贴附于基膜的下表面，将透明粘合胶贴附于装饰膜的上表面，以实现将装饰膜及透明粘合胶同时贴附于基膜的同一表面；可将装饰膜附于基膜的上表面，并将透明粘合胶贴附于基膜的下表面，以实现将装饰膜及透明粘合胶分别贴附于基膜的两个表面 。Both the transparent adhesive and the decorative film are attached to the surface of the base film, and the specific attachment methods can be divided into two types: attach the decorative film and the transparent adhesive to the same surface of the base film, or attach the decoration The film and the transparent adhesive are attached to the upper and lower surfaces of the base film, respectively. Specifically, the decorative film can be attached to the lower surface of the base film, and the transparent adhesive can be attached to the upper surface of the decorative film, so that the decorative film and the transparent adhesive can be attached to the same surface of the base film at the same time; The decorative film can be attached to the upper surface of the base film, and the transparent adhesive can be attached to the lower surface of the base film, so that the decorative film and the transparent adhesive can be attached to the two surfaces of the base film respectively.
其中，基膜具有良好的延展性，基膜可以是流延聚丙烯(CPP)薄膜、双向拉伸聚丙烯(OPP)薄膜或热可塑性聚氨酯(TPU)薄膜中的一种，或其他具有良好延展性的薄膜。基膜的厚度为0.04-0.15mm。透明粘合胶可以涂布或粘贴的方式贴合于基膜的表面，透明贴合胶在常温下无粘性，只有在一定温度和压力的环境下，透明贴合胶才能牢固粘合于产品的表面。其中，可通过多种方法将预设的装饰膜贴合于基膜的表面，可通过UV转印、电镀、丝印、胶印或凸版印刷将预设的装饰膜贴附于基膜的表面。Among them, the base film has good ductility, and the base film may be one of cast polypropylene (CPP) film, biaxially oriented polypropylene (OPP) film or thermoplastic polyurethane (TPU) film, or other with good ductility Film. The thickness of the base film is 0.04-0.15 mm. The transparent adhesive can be applied to the surface of the base film by coating or pasting. The transparent adhesive is not sticky at room temperature. Only under a certain temperature and pressure environment can the transparent adhesive be firmly adhered to the product. surface. Among them, the preset decorative film can be attached to the surface of the base film by various methods, and the preset decorative film can be attached to the surface of the base film by UV transfer, electroplating, screen printing, offset printing, or letterpress printing.
S120、通过预贴合设备将述预贴合薄膜的贴合面预贴合固定于产品的贴合面。预贴合设备中包括预对位装置及加热装置。S120. Pre-laminate and fix the bonding surface of the pre-lamination film to the bonding surface of the product through a pre-lamination device. The pre-lamination equipment includes a pre-alignment device and a heating device.
具体的，S120步骤具体包括：通过所述预贴合设备中的预对位装置对所述预贴合薄膜的贴合面与所述产品的贴合面进行精密对位；通过所述预贴合设备中的加热装置将所述预贴合薄膜的局部预贴合固定于所述产品的贴合面。预对位装置即是用于将预贴合薄膜与产品进行精密对位的装置，通过加热装置对预贴合薄膜与产品进行加热，即可将预贴合薄膜局部固定在产品的贴合面，以达到局部固定的效果，也即是实现将预贴合薄膜预贴合固定于产品的贴合面。Specifically, step S120 specifically includes: precisely positioning the bonding surface of the pre-lamination film and the bonding surface of the product through a pre-alignment device in the pre-lamination device; The heating device in the bonding equipment fixes the partial pre-lamination of the pre-lamination film to the lamination surface of the product. The pre-alignment device is a device for precisely aligning the pre-laminated film and the product. The pre-laminated film and the product are heated by the heating device, and the pre-laminated film can be partially fixed on the bonding surface of the product In order to achieve the effect of local fixation, that is, to achieve the pre-lamination film pre-lamination fixed to the product bonding surface.
具体的，步骤S120之后还包括：在所述预贴合薄膜的非贴合面及所述产品的非贴合面固定设置支撑垫。具体的，可根据产品的形状、局部开孔、材质等等特性，在产品背面对应位置固定设置支撑垫，在预贴合薄膜的上表面固定设置支撑垫，支撑垫具有对预贴合薄膜进行辅助贴合的作用，支撑垫可选择较柔软的材质制作得到，例如可选择聚氨基甲酸酯或硅胶作为支撑垫的材质。Specifically, after step S120, the method further includes: fixing a supporting pad on the non-lamination surface of the pre-lamination film and the non-lamination surface of the product. Specifically, according to the product's shape, local openings, materials, etc., a support pad can be fixed at the corresponding position on the back of the product, and a support pad can be fixed on the upper surface of the pre-laminated film. For the purpose of assisting the fitting, the support pad can be made of a softer material, for example, polyurethane or silicone can be used as the material of the support pad.
S130、对所述产品的弯曲角度是否大于预设的弯曲角度阈值进行判断，若所述产品的弯曲角度大于所述弯曲角度阈值，将已预贴合固定的所述预贴合薄膜及所述产品放置于密封袋并对所述密封袋 抽真空。具体的，弯曲角度阈值可根据用户的需求进行设定，在实际使用过程中可将弯曲角度设置为20°-45°。则若产品的弯曲角度大于弯曲角度阈值，则将已预贴合固定的预贴合薄膜及产品放置于密封袋中；若产品的弯曲角度不大于弯曲角度阈值，则无需将预贴合薄膜及产品放置于密封袋中。S130. Judge whether the bending angle of the product is greater than a preset bending angle threshold. If the bending angle of the product is greater than the bending angle threshold, the pre-laminated film and the The product is placed in a sealed bag and the sealed bag is evacuated. Specifically, the bending angle threshold can be set according to the needs of the user, and the bending angle can be set to 20°-45° in actual use. If the bending angle of the product is greater than the bending angle threshold, the pre-laminated film and product that have been pre-laminated are placed in a sealed bag; if the bending angle of the product is not greater than the bending angle threshold, the pre-laminated film and The product is placed in a sealed bag.
S140、将已预贴合固定的所述预贴合薄膜及所述产品或已抽真空的所述密封袋置于具有预设温度及预设压强的气态介质中预设时间，以通过气态介质的温度和压力将所述预贴合薄膜全面贴合于所述产品的贴合面。若预贴合薄膜及产品未放置于密封袋中，则直接将已预贴合固定的预贴合薄膜及产品置于预设温度及预设压强的气态介质中；若预贴合薄膜及产品被放置于密封袋中，则将放置有预贴合薄膜及产品的密封袋置于预设温度及预设压强的气态介质中。具体的，预设温度为60-150摄氏度，预设压强不小于5kg/cm
2，预设时间大于1分钟；气态介质为空气、氮气或惰性气体。将装有预贴合薄膜和产品置于密封腔体内，并向密封腔体内注入加热气体，在密封腔体内达到一定压强并保持预设时间后，可通过透明贴合胶的作用将装饰膜全面贴合于产品的贴合面。
S140: Place the pre-laminated film and the product that have been pre-laminated and fixed or the vacuum-sealed bag in a gaseous medium with a preset temperature and a preset pressure for a preset time to pass the gaseous medium The temperature and pressure of the pre-lamination film are fully applied to the bonding surface of the product. If the pre-laminated film and product are not placed in the sealed bag, the pre-laminated film and product that have been pre-laminated are directly placed in the gaseous medium at the preset temperature and pressure; if the pre-laminated film and product are When it is placed in a sealed bag, the sealed bag with the pre-laminated film and product is placed in a gaseous medium at a preset temperature and preset pressure. Specifically, the preset temperature is 60-150 degrees Celsius, the preset pressure is not less than 5 kg/cm 2 , and the preset time is more than 1 minute; the gaseous medium is air, nitrogen, or inert gas. Put the pre-laminated film and product in the sealed cavity, and inject the heated gas into the sealed cavity. After reaching a certain pressure in the sealed cavity and maintaining it for a preset time, the decorative film can be fully Fit to the fitting surface of the product.
S150、对所述预贴合薄膜与所述产品贴合的紧密度是否大于预设的紧密度阈值进行判断。S150. Determine whether the tightness of the pre-laminated film and the product is greater than a preset tightness threshold.
具体的可通过紧密度检测设备检测以获取预贴合薄膜与所述产品贴合的紧密度，并将预贴合薄膜与产品贴合的紧密度与预设的紧密度阈值进行判断，若预贴合薄膜与产品贴合的紧密度大于预设的紧密度阈值则表明预贴合薄膜产品之间已紧密贴合；若预贴合薄膜与产品贴合的紧密度不大于紧密度阈值则表明预贴合薄膜产品之间还未紧密贴合，需通过其他装置对预贴合薄膜进行处理。Specifically, it can be detected by a tightness detection device to obtain the tightness of the bonding of the pre-laminated film and the product, and the tightness of the bonding of the pre-laminated film and the product and the preset tightness threshold are judged. The tightness of the bonding film to the product is greater than the preset tightness threshold value, indicating that the pre-lamination film product has been closely bonded; if the tightness of the pre-lamination film and product bonding is not greater than the tightness threshold value, it indicates The pre-laminated film products are not tightly bonded yet, and the pre-laminated film needs to be processed by other devices.
S160、若预贴合薄膜与所述产品贴合的紧密度不大于所述紧密度阈值，通过预设固化装置将所述预贴合薄膜紧密固化于所述产品 的贴合面。通过固化装置将产品贴合面的预贴合薄膜进行固化后，可大幅增强预贴合薄膜在产品贴合面的附着力，使预贴合薄膜贴合更加紧密。具体的，固化装置可选择为热风干燥机或UV紫外灯，还可通过将热风干燥机及UV紫外灯进行组合得到固化装置对预贴合薄膜进行固化。通过UV紫外灯产生UV紫外光对预贴合薄膜进行固化，可大幅增强预贴合薄膜贴合后抗化学腐蚀的性能。S160. If the tightness of the bonding between the pre-laminated film and the product is not greater than the tightness threshold, the pre-laminated film is tightly cured to the bonding surface of the product by a preset curing device. After the pre-lamination film on the product bonding surface is cured by the curing device, the adhesion of the pre-lamination film on the product bonding surface can be greatly enhanced, and the pre-lamination film can be bonded more tightly. Specifically, the curing device may be a hot air dryer or a UV ultraviolet lamp, and a curing device may be obtained by combining the hot air dryer and the UV ultraviolet lamp to cure the pre-laminated film. The UV light is generated by the UV lamp to cure the pre-laminated film, which can greatly enhance the chemical corrosion resistance of the pre-laminated film after lamination.
通过上述方法将装饰膜牢固粘合于产品的表面，适用于平面及复杂曲面的产品，可避免装饰膜粘合过程中产生气泡或褶皱，避免划伤产品的外表面，避免在进行贴合时产品破损，大幅提高了企业在进行热转印加工的过程中产品的良品率。By the above method, the decorative film is firmly bonded to the surface of the product. It is suitable for flat and complex curved products. It can avoid bubbles or wrinkles during the bonding of the decorative film, avoid scratching the outer surface of the product, and avoid lamination. The product is damaged, which greatly improves the yield rate of the product during the thermal transfer process.
本发明方法通过根据预设的模切尺寸对贴附有透明粘合胶的装饰膜进行精密模切以得到预贴合薄膜，并将预贴合薄膜预贴合固定在产品的贴合面，将已预贴合固定的所述预贴合薄膜及所述产品置于具有预设温度及预设压强的气态介质中预设时间，以通过气态介质的温度和压力将所述预贴合薄膜全面贴合于所述产品的贴合面，可在平面及复杂曲面的产品进行高精度热转印加工，大幅提高了对产品外表面进行装饰及防爆加工的良品率，在实际应用过程中取得了良好的效果。The method of the present invention obtains a pre-laminated film by precision die-cutting a decorative film attached with a transparent adhesive according to a preset die-cutting size, and fixes the pre-laminated film on the laminating surface of the product, Placing the pre-laminated film and the product that have been pre-laminated and fixed in a gaseous medium having a preset temperature and a preset pressure for a preset time, so that the pre-laminated film is subjected to the temperature and pressure of the gaseous medium Fully fit on the bonding surface of the product, can carry out high-precision thermal transfer processing on flat and complex curved products, greatly improving the yield of decorative and explosion-proof processing on the outer surface of the product, obtained in the actual application process Good effect.
应当理解的是，本发明的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本发明所附权利要求的保护范围。It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or changes can be made according to the above description, and all such improvements and changes should fall within the protection scope of the appended claims of the present invention.
Claims (9)
- 一种用于精密贴膜的热转印方法，其特征在于，包括：A thermal transfer method for precision lamination, which is characterized by including:根据预设的模切尺寸对贴附有透明粘合胶的装饰膜进行精密模切以得到预贴合薄膜；According to the preset die cutting size, the decorative film with the transparent adhesive glue is precisely die cut to obtain a pre-laminated film;通过预贴合设备将述预贴合薄膜的贴合面预贴合固定于产品的贴合面；Pre-laminate the bonding surface of the pre-lamination film to the bonding surface of the product through pre-lamination equipment;对所述产品的弯曲角度是否大于预设的弯曲角度阈值进行判断，若所述产品的弯曲角度大于所述弯曲角度阈值，将已预贴合固定的所述预贴合薄膜及所述产品放置于密封袋并对所述密封袋抽真空；Determine whether the bending angle of the product is greater than a preset bending angle threshold, and if the bending angle of the product is greater than the bending angle threshold, place the pre-laminated film and the product that have been pre-laminated and fixed To seal the bag and evacuate the sealed bag;将已预贴合固定的所述预贴合薄膜及所述产品或已抽真空的所述密封袋置于具有预设温度及预设压强的气态介质中预设时间，以通过气态介质的温度和压力将所述预贴合薄膜全面贴合于所述产品的贴合面；The pre-laminated film and the product that have been pre-laminated and fixed or the vacuum-sealed bag are placed in a gaseous medium with a preset temperature and a preset pressure for a preset time to pass the temperature of the gaseous medium And the pressure to fully adhere the pre-lamination film to the lamination surface of the product;对所述预贴合薄膜与所述产品贴合的紧密度是否大于预设的紧密度阈值进行判断；Determine whether the tightness of the pre-laminated film and the product is greater than a preset tightness threshold;若预贴合薄膜与所述产品贴合的紧密度不大于所述紧密度阈值，通过预设固化装置将所述预贴合薄膜紧密固化于所述产品的贴合面。If the tightness of the bonding between the pre-laminated film and the product is not greater than the tightness threshold, the pre-laminated film is tightly cured on the bonding surface of the product by a preset curing device.
- 根据权利要求1所述的用于精密贴膜的热转印方法，其特征在于，所述透明粘合胶及所述装饰膜均贴附于基膜表面，所述基膜为流延聚丙烯薄膜、双向拉伸聚丙烯薄膜或热可塑性聚氨酯薄膜。The thermal transfer method for precision lamination according to claim 1, wherein the transparent adhesive and the decorative film are attached to the surface of the base film, and the base film is a cast polypropylene film , Biaxially oriented polypropylene film or thermoplastic polyurethane film.
- 根据权利要求1所述的用于精密贴膜的热转印方法，其特征在于，所述通过预贴合设备将述预贴合薄膜的贴合面预贴合固定于产品的贴合面包括：The thermal transfer method for precision lamination according to claim 1, wherein the pre-lamination of the lamination surface of the pre-lamination film to the lamination surface of the product by a pre-lamination device comprises:通过所述预贴合设备中的预对位装置对所述预贴合薄膜的贴合面与所述产品的贴合面进行精密对位；Precisely align the bonding surface of the pre-lamination film with the bonding surface of the product through a pre-alignment device in the pre-lamination equipment;通过所述预贴合设备中的加热装置将所述预贴合薄膜的局部预 贴合固定于所述产品的贴合面。The partial pre-lamination of the pre-lamination film is fixed to the lamination surface of the product by a heating device in the pre-lamination device.
- 根据权利要求1所述的用于精密贴膜的热转印方法，其特征在于，所述通过预贴合设备将述预贴合薄膜的下表面预贴合固定于产品的正面之后，还包括：The thermal transfer method for precision lamination according to claim 1, wherein after pre-laminating the lower surface of the pre-lamination film to the front of the product by a pre-lamination device, further comprising:在所述预贴合薄膜的非贴合面及所述产品的非贴合面固定设置支撑垫。A supporting pad is fixedly arranged on the non-lamination surface of the pre-lamination film and the non-lamination surface of the product.
- 根据权利要求4所述的用于精密贴膜的热转印方法，其特征在于，所述支撑垫的材质为聚氨基甲酸酯或硅胶。The thermal transfer method for precision lamination according to claim 4, wherein the material of the support pad is polyurethane or silicone.
- 根据权利要求1所述的用于精密贴膜的热转印方法，其特征在于，所述预设温度为60-150摄氏度，所述预设压强不小于5kg/cm 2。 The thermal transfer method for precision lamination according to claim 1, wherein the preset temperature is 60-150 degrees Celsius, and the preset pressure is not less than 5 kg/cm 2 .
- 根据权利要求1所述的用于精密贴膜的热转印方法，其特征在于，所述气态介质为空气、氮气或惰性气体。The thermal transfer method for precision lamination according to claim 1, wherein the gaseous medium is air, nitrogen or inert gas.
- 根据权利要求1所述的用于精密贴膜的热转印方法，其特征在于，所述预设时间大于1分钟。The thermal transfer method for precision lamination according to claim 1, wherein the preset time is greater than 1 minute.
- 根据权利要求1所述的用于精密贴膜的热转印方法，其特征在于，所述预设固化装置为热风干燥机和/或UV紫外灯。The thermal transfer method for precision lamination according to claim 1, wherein the preset curing device is a hot air dryer and/or UV ultraviolet lamp.
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| CN201910026342.3A CN109720137A (en) | 2019-01-11 | 2019-01-11 | A kind of heat-transferring method for accurate pad pasting |
| CN201910026342.3 | 2019-01-11 |
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| CN (1) | CN109720137A (en) |
| WO (1) | WO2020143821A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109720137A (en) * | 2019-01-11 | 2019-05-07 | 深圳凯和科技有限公司 | A kind of heat-transferring method for accurate pad pasting |
| CN114103091A (en) * | 2020-08-28 | 2022-03-01 | 深圳市能佳自动化设备有限公司 | 3D film pasting method based on heating and pressurizing |
| CN114103090A (en) * | 2020-08-28 | 2022-03-01 | 深圳市能佳自动化设备有限公司 | 3D film pasting method based on air heating |
| CN114103089A (en) * | 2020-08-28 | 2022-03-01 | 深圳市能佳自动化设备有限公司 | 3D film pasting method based on liquid heating |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1060902A2 (en) * | 1999-06-18 | 2000-12-20 | Cubic Co., Ltd. | Liquid pressure transfer method for loop-like workpiece and product decorated thereby |
| CN1528603A (en) * | 2003-09-25 | 2004-09-15 | 谭哲豪 | Method for pressing surface decorating pattern of puture-fixed product using vacuum absorbing |
| CN101554933A (en) * | 2008-04-09 | 2009-10-14 | 华硕电脑股份有限公司 | Thermal transfer printing system and thermal transfer printing method |
| CN101992614A (en) * | 2009-08-13 | 2011-03-30 | 麟雅商务咨询(上海)有限公司 | Heat transfer printing method on object surface |
| CN103507398A (en) * | 2013-10-08 | 2014-01-15 | 珠海天威飞马打印耗材有限公司 | Heat transfer printing device and method |
| CN107175943A (en) * | 2017-07-18 | 2017-09-19 | 郑君华 | Heat-transferring method and system |
| CN109720137A (en) * | 2019-01-11 | 2019-05-07 | 深圳凯和科技有限公司 | A kind of heat-transferring method for accurate pad pasting |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1033200C2 (en) * | 2007-01-10 | 2008-07-11 | Anthonius Johannus Tolboom | Creating image or text on panel, comprises sublimation process using temperature and pressure to transfer liquid from film to panel surface |
| CN102874003B (en) * | 2012-09-25 | 2016-01-20 | 深圳市杰瑞表面技术有限公司 | The printing transferring method of space pattern |
| CN106891635B (en) * | 2017-01-18 | 2019-03-05 | 深圳市恒久瑞电子科技有限公司 | A kind of transfer processing method of surrounding curved surface 3D cover board |
| CN206490826U (en) * | 2017-03-02 | 2017-09-12 | 钟蒋华 | A kind of diaphragm of loudspeaker being made based on compound vacuole cotton material |
| CN207954929U (en) * | 2018-01-29 | 2018-10-12 | 深圳凯和科技有限公司 | Thermal transfer device |
| CN108839333A (en) * | 2018-06-06 | 2018-11-20 | 三得应用材料（深圳）有限公司 | A kind of method for adhering film |
-
2019
- 2019-01-11 CN CN201910026342.3A patent/CN109720137A/en active Pending
-
2020
- 2020-01-13 WO PCT/CN2020/071633 patent/WO2020143821A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1060902A2 (en) * | 1999-06-18 | 2000-12-20 | Cubic Co., Ltd. | Liquid pressure transfer method for loop-like workpiece and product decorated thereby |
| CN1528603A (en) * | 2003-09-25 | 2004-09-15 | 谭哲豪 | Method for pressing surface decorating pattern of puture-fixed product using vacuum absorbing |
| CN101554933A (en) * | 2008-04-09 | 2009-10-14 | 华硕电脑股份有限公司 | Thermal transfer printing system and thermal transfer printing method |
| CN101992614A (en) * | 2009-08-13 | 2011-03-30 | 麟雅商务咨询(上海)有限公司 | Heat transfer printing method on object surface |
| CN103507398A (en) * | 2013-10-08 | 2014-01-15 | 珠海天威飞马打印耗材有限公司 | Heat transfer printing device and method |
| CN107175943A (en) * | 2017-07-18 | 2017-09-19 | 郑君华 | Heat-transferring method and system |
| CN109720137A (en) * | 2019-01-11 | 2019-05-07 | 深圳凯和科技有限公司 | A kind of heat-transferring method for accurate pad pasting |
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