Introduction to IMD process flow of the hottest in

2022-09-22
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IMD (in mold decoration) is a forming method that puts the printed pattern diaphragm into the metal mold, injects the resin used for forming into the metal mold and joins with the diaphragm, so that the printed pattern diaphragm and the resin form an integral whole and solidify into a product. This process has the advantages of corrosion resistance, wear resistance, no falling off, bright colors, color patterns can be changed at any time, excellent surface decoration effect and so on. It is widely used in the surface decoration of MP3, home appliances, instruments and meters and other products

imd definition:

i IMD explanation: the Chinese name of IMD: in mold decoration technology, English Name: in mold decoration. IMD is an internationally popular surface decoration technology, with surface hardening transparent film, middle printing pattern layer, back injection molding layer, and ink middle, which can prevent the surface of products from being scratched and abrasion resistant, and can maintain the bright color for a long time. IMD includes IML, IMF, IMR iml:in molding label (no stretching, small surface, for 2D products) imf:in molding film (suitable for high stretching products, 3D products) imr:in molding roller (remove the film on the product surface, leaving only ink on the product surface.)

iml, the difference between IMF and IMR (whether a layer of film is left on the surface)

traditional plastic processing technology has gradually failed to meet the needs of the new era. Light, thin, short consumer electronics and environmental awareness are on the rise. IMD technology came into being on this basis. Due to the advantages of IMD, it is suitable for plastic products of 3C, household appliances, logo nameplate and auto parts, especially the currently popular shell and various instrument panels. Advanced manufacturers in the world, such as Bayer in Germany and Ge in the United States, are all developing this process

(IMD) in mold decoration is a relatively new automatic production process. Compared with other processes (IMD), it can reduce production steps and disassemble components, so it can save time and cost in rapid production. At the same time, it also has the advantages of improving quality, increasing image complexity and improving product durability. When applied to product appearance, (IMD) is the most efficient method at present, which is to apply printing, high-pressure forming and punching on the film surface, Finally, it is combined with plastic to form, eliminating secondary operation procedures and human hours, especially in the need of backlight, multi curved surface, imitation metal, hair line processing, logical light pattern, rib interference When the printing and painting process cannot be handled, it is even more time to use the IMD process

(IMD) in mold decoration can replace many traditional processes, such as heat transfer, spraying, printing, electroplating and other appearance decoration methods. In particular, we need a variety of color images, backlights and other related products

imd/film process

imd process flow chart is as follows:

imd process flow must apply special data clip process introduction is as follows:

imd process mainly consists of the following parts process

- ink and printing technology

- molding process

- punch and cutting

- back injection molding

each process is independent and closely connected with each other

I. process design

1. Workpiece shape design

2 Mold design

3. Injection port design: type, location and quantity of injection ports

II. Process selection:

1. The material and thickness of the sheet and the type of ink (UV or solvent) are appropriate according to the product requirements

2. Select the appropriate series of special IMD inks according to the material of the sheet, such as Baolong brand for solvent type:

noriphan HTR series for ordinary PC sheet

noriphan n2k series for thin PC sheet

NoriPET series for PET sheet (1) the utilization analysis column of PP epdm-td materials in the outer trim of the bumper

noricryl series for PMMA sheet

3. According to the ink type, such as solvent type or UV, Choose appropriate drying methods and drying equipment

III. process:

1. Film output and plate making: select the appropriate silk, photosensitive paste or film according to the graphic requirements

2. Printing: fully stir the ink, take an appropriate amount of ink - - add it to the grain dilutor in proportion - - printing (parameters affecting ink printing: plate quality, scraper speed, hardness, etc.)

3. Drying method and conditions (taking Baolong HTR series ink as an example):

a, three-stage drying (the first stage is 70 C, the second stage is C, the third stage is room temperature, and the conveyor belt speed is m/min)

b Post drying: put it on the drying rack and dry it in the oven. The air circulation and air exchange of the oven are good, and the temperature is C hours

4. Molding: metal mold molding, vacuum molding, high-pressure molding, etc.

5. Shearing: matching with molding mold and injection mold

6. Injection molding: choose injection plastic according to needs, and choose different injection temperature according to injection plastic

imd process application attention parameters:

there are more than 50 parameters that affect IMD process, The main parameters are as follows:

- workpiece design

- Sheet selection

- addition of diluent/hardener

- ink drying

- residence time between printing and injection molding

- injection port

- injection temperature

- Thermoplastic selection

- leveling of thermoplastic

- injection pressure

- cycle cycle.

- temperature of mechanical tools

every process step in IMD process is very important, The success of each step and close combination can make IMD workpiece

key points for IMD injection molding:

because the temperature that the ink can withstand is 250 ~ 260, when designing the injection mold, it is necessary to consider the injection pressure, injection time, gate size and quantity and the physical properties of the injection material. In order to achieve low injection pressure and short injection time, the following methods can be considered:

a. the shorter the sprue design is, the better, and the hot sprue is the best

b. the gate area can be increased or more gates can be adopted

c. injection material selection: the higher the fluidity, the better, the lower the injection temperature

d. the lower the injection pressure and the lower the injection temperature, the longer the ink can withstand

e. ink that can prevent ink flushing can be added at the gate. Proell has provided the structure of the injection mold, and the consistency between the cavity and the shape of the molding mold

g. at the intersection of shooting meeting, Try not to choose the position with the highest stretch (most of the time, at the four corners, due to its thin place, the heat expansion and cold contraction are more serious, and wrinkles will appear.

h. the situation of multiple holes in the the first mock examination is more strict than the traditional one, because the injection, pressure holding time and temperature should be consistent

i. the injection conditions have less variability in the IMD process, so it is recommended to choose the semi closed or fully closed ejector

j. due to the characteristics of film heat expansion and cold contraction, the mold temperature cannot be too high to form, so It is recommended to use mold warming machine

k. because of the built-in film, the thicker the place is, the easier it is to shrink. Therefore, the solution to shrinkage cannot be handled by the traditional pressure maintaining and overpressure methods, but only by reducing materials and hollowing out

common problems and solutions in injection molding:

(1) the main reasons why the pattern ink is washed away during injection molding are as follows:

the ink is not dry, there is residual solvent, and bubbles will be generated. During injection molding, the ink diffuses and the adhesion with the sheet decreases, etc.

silver ink needs to be dried for a longer time

the influence of sheet thickness, the area of ink dispersed increases with the increase of sheet thickness

it is related to the structure of injection port design. The project designs and develops polyurethane foam insulation products with different physical and chemical properties, and whether the shape and distribution are reasonable

is related to the temperature of plastic injection. If the temperature of injection resin is increased, the area dispersed will be reduced. The temperature setting is related to the type of injection plastic and the structure of injection mold

the ink layer is printed too thin

the ink itself is not resistant to high temperature

the injected plastic was not dewatered before injection molding, resulting in bubbles during injection molding

improper viscosity adjustment of prepress ink leads to pinholes in the ink layer and poor leveling

(2) the reason why the sheet is easy to separate:

there is residual solvent in the ink

the temperature, pressure and cooling system of the injection molding machine are improperly controlled

in the silver ink, the pigment content is too high, or it is not consistent with the injection molding process. The quality of the Rotorless vulcanizer of Jinan new era assaying Instrument Co., Ltd. is stable

the binding fastness between the ink itself and the substrate is poor

no water-based adhesive

the mirror ink is too close to the bend

there is moisture in the injection plastic

htr ink adhesion is related to the temperature of injection resin

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