Plastic Film

详情

1,The way attracts models can divided into:dry and wet two attracts models way.
2,Dry attracts models: Adhesive dry compound, into the machine plastic called dry plastic, generally at room temperature of *5 DEG C case, glue drying time : *0 to *0 minutes. *0 C and *0 environment, adhesive drying time of 3 – *0 minutes. Recommendations for customers in the plastic film can be completely transparent, plastic. Drying time is too long, the effect of bonding effect. Especially for adding curing agent adhesive, should try to shorten the drying time, spray dry within one hour after must finish blister, otherwise it will affect the effect of.
3,Wet attracts models: Adhesive in wet condition, namely into the machine called wet blister blister. Wet blister is mainly aims at the customer equipment is unable to achieve the lowest activation temperature or adhesive composite thin film temperature resistance performance is very poor condition, as the adhesive in plastic process water does not evaporate completely, therefore, plastic time than the dry plastic long. Typically, as little as possible using a wet composite, especially short heating time of plastic operation, otherwise, the finished product is likely to occur" sliding rubber" phenomenon.
B, Attentive proceeding of film
1,Different film have different reponse of high temperature,if change the material,should produce abundantly after evaluating the operate
condition.
2, To the best of our abilities to use the fim with low plasticizers, because the film plasticizer in long time storage and high temperature environment, it is possible to dissociate from the surface, thus affecting the bonding effect.
3,For the soft film:advice to use longer attracts models time,and relatively low plastic temperature.
C, Spurt gumwater and the amout
1,It should be equally when spurt the gumwater,compare the plane,side and concave and convex surfaces need double glue.
2,Usually,the spurt aumwater mout of plane should be ****5g/m2, the spurt aumwater mout of contour should be *5一**5 g／m2.
D,The lowest activation temperature of adhesive
The lowest activation temperature means in the plastic operation, suction plastic activation produced by bonding performance of minimum temperature, corresponding to the adhesive film can reach temperatures, rather than the machine set temperature! Glue normally, plastic temperature is higher, the more conducive to the adhesive film on the composite film surface infiltration, pair bonding effect favorable.But customers will often consider the composite thin film heat resistant degree, and reduce the plastic temperature.
E,The vacuum degree
1,The vacuum degree depends on the different plastic equipment, films with different manufacturers, different film thickness, temperature, plastic sheet surface profile, sheet placement, customers should act according to own actual situation to make corresponding adjustment.
2,Under normal circumstances,according to experience, to 0.*6mm a 0.*0mm thick film, in the machine set temperature ll0 ~ **0 conditions, the vacuum degree of: 0.*7Mpa 0.*9Mpa.
F,The time of vacuum degree
1, The vacuum time depends on: film hardness, plastic sheet profile, temperature, vacuum degree, the customer should be according to their own actual conditions do corresponding adjustment.
2, under normal circumstances,according to experience, in ensure plastic temperature reaches the adhesive activation temperature, minimum film fully softened condition, vacuum time: 5 to *0 seconds.
G,Pressure
1, the capsule forming equipment and portion of capsule of plastic equipment, in a vacuum, forming bins into hot air to form a high pressure, ensure that the film pressing board, pressure depends on the size of: plastic temperature, film thickness, sheet metal profile, such as the degree of vacuum, the customer should be according to their own actual situation to make the corresponding adjustment.
2, According to experience, pressure is 2 ~ *8kg / m2.
3, For some without a capsule of plastic equipment, plastic only in vacuum, no pressure, to ensure that the suction effect, its vacuum degree should be increased. H,The time of pressure
1, For wet blister, suggested pressure time : 3 to 5 minutes.
2, For dry packing pressure time, recommended for: 2, 3 minutes.
I,The spray gun caliber
1, Under normal circumstances, spray gun caliber : 1.5 - 2.5mm.
2, Spray gun caliber is less than 1.0mm operation easy to plug nozzle, affects the working efficiency; the spray gun of large caliber.
Vacuum plastic decorative film pressing process control points
Membrane pressure technology in furniture industry especially is very important in the production of doors and cabinets. Medium density material is processed into a variety of linear and covered with various brightness, color, texture of the plastic film, so that the product of rich and colorful, a superb collection of beautiful things, to the consumer to create a great choice. However, the application of this technology to manufacture products. Its quality is differ in thousands of ways. The cause of these differences among the causes of substrate and the facing material itself factors, process parameter control is also very important. Below with some models of membrane compressor as an example, using the two-component film adhesive, for the entire process of.
The 1 film the working principle
The use of the diaphragm plasticity, through the membrane pressure time, equipment cavity temperature and air pressure adjustment and control to the diaphragm, heating, pressurizing, the diaphragm is coated on the surface of a workpiece.
Work process: ( 1) placing a workpiece on the worktable; ( 2) into the heating plate of the work table; ( 3) the heating plates and the worktable together; ( 4) heating plate and a silicone membrane between the air was pumped out, the silicone membrane adsorption to the heating plate is heated; ( 5) to set the time after the heating plate and the silicone membrane between the injection of compressed air, the silicone membrane and diaphragm in close contact, workpiece and the diaphragm is heated, while the diaphragm is to soften the edges of the plates, the temperature reaches the adhesive activation temperature; ( 6) the work table and the diaphragm between the air was quickly pulled out to form a vacuum, then the diaphragm and the heating plate between the injection compression air, diaphragm in the setting of the pressure and temperature of the role of being coated in a plate.
The 2 rules of operation
The 2.1 film adhesive application requirements
Film adhesive is a two-component adhesive, activation temperature of about *0 oC. Storage temperature should be 5 - *0 DEG C, 5 DEG C can cause floc node. Plastic barrels should not be placed directly on the ground, should be placed in a wooden frame, especially in winter. Film adhesive is valid without dismantling the original packaging state, since the date of factory for 6 months.
Film adhesive proportion of main agent: curing agent = *0: 1, the main agent and curing agent are mixed, should make the main agent in mixing state, curing agent slowly adding and mixing at least 3 minutes. Each preparation of adhesive should be used up within 4 hours guarantee. Against the adhesive glue barrels should be covered.
2.2 spray process requirements:
2.2.1 adhesive in order to front line to front end to end + linear, the plane part, spray again can be; end face and a plane linetype department need to spray two times.
2.2.2 main agent and a curing agent after mixing the active time of *6 hours, has adhesive work should be finished in 4 hours to get the best adhesion effect. Otherwise, glue cross-linking reaction and activation temperature to rise, although look from the exterior plywood effect is good, but temperature performance have significantly reduced, if the two adhesive in PVC surface glue mark.
2.2.3 after spraying surface pale and dry, hand touch sticky or drying obviously after film gloss drying time for ****0 minutes ( depending on the environment temperature, humidity and spraying quality ).
Commonly used
2.2.4 fan from workpiece 1.**2.0 meters at the workpiece to moist air to blow away, in order to avoid artifacts due to humidity and diaphragm bubble.
2.2.5 in the winter, in order to raise the temperature of the workpiece, can use small house into the workpiece is heated to ***5 C conditions (no temperature is higher than *5 DEG C, otherwise the workpiece deformation may be produced ). Spray should not lower than *6 DEG C in a water environment on.
2.2.6 adhesive handlers should wear masks, to protect the health of operators.
2.3 film machine silicone membranes using
According to the linear features ( such as arc values, angular, linear width and depth ) choose a different thickness of silica gel membrane.
Silicone membrane due to the often heated and stretched, the sag will increase, should be based on silica gel membrane sagging degree timely installation, reduce the droop.
In order to extend the silicone membrane life, prevent the workpiece to produce quality problem, should be regularly exchanged silica membranes using direction, such as front back left right end, variable variable.
If the silica membrane corner have holes or short gap, available silica gel and membrane repairing machine repair. When repairing with flat heavy compaction, dry *4 hours, repair with **0 sandpaper sand flat can be normal use.
The 2.4 process parameter settings
2.4.1 membrane pressure workpiece spacing: width is less than **0mm narrow and long workpiece, workpiece spacing of not less than *0mm; width greater than **0mm workpiece, workpiece spacing of not less than *0mm; the workpiece and table frame spacing of not less than *0mm. Transverse and longitudinal spacing should be in a straight line, in order to reduce air flow resistance.
2.4.2 workpiece pad: plate width and length shall be than the workpiece width and length of small **0mm, pad on the surface surrounding the edges should be inverted radius 3mm5mm fillet or inverted 3 x *5 DEG angle, in order to ensure the air between the diaphragm and the workpiece is completely pumping diaphragm, to firmly glued onto the workpiece edge effect. Plate thickness shall be the thickness of 3 / 4 or so, is to ensure that the diaphragm is one of the important measures to pull the white.
2.4.3: according to the different setting temperature of diaphragm, temperature setting should be at **0 degrees C **0 DEG C, TPO diaphragm temperature is higher, general PVC ( relative to high light PVC ) temperature secondly, high light PVC should lower ( to avoid high temperature due to loss of light ).
2.4.4 set time: preheating time should be *0s*0s ( diaphragm between different colors, preheating time should also be different, the light should be extended, dark should be appropriately shortened; thick film should be extended, film should be appropriately shortened), vacuum pumping time is about 8s, pressing time for preheating time plus ***0s around. Reach the set pressure time should not be too long, should be about 5S, to ensure the end surface of the workpiece to the activation temperature above the diaphragm and substrate adhesion and not excessive quickly without stretching the workpiece on the diaphragm.
2.4.5 set pressure setting for 3.8bar4.2bar: positive pressure, negative pressure for 0.7bar0.8bar, namely positive pressure and negative pressure of about 4.5bar5.0bar.
For thicker workpiece, high optical diaphragm and a thickness of less than 0.3mm film sheet should be appropriately reduced the set temperature, appropriate to increase the preheating time and increasing the work table, the bottom plate height, shortening the distance with the heating plate, to reduce or avoid the color problem.
2.5 trimming requirements
Machine processed workpiece, placed *0 minutes (to ensure that the adhesive can be used only for the initial curing ) trimming.
After trimming with special tool scrape corners or **0 **0 of sandpaper chamfering, make PVC below the surface of the workpiece. And use alcohol thinner put back glue mark clean. Trimming check quality, can repair in situ repair, can’t repair to pick out further processing.
Membrane pressure after the workpiece must be face to face, placed back to back to the flat material rack. *0 blocks of a crib, heavy pressure from above, to prevent the deformation of the workpiece, some time should not be less than *4 hours. Membrane pressure workpiece reached metaphase curing time of *4 hours, completely cured required 7 days, so to ensure the workpiece before packing assembly for more than *4 hours.
3, Film pressure workpiece temperature test
Through the temperature resistance test can verify the membrane pressure workpiece temperature performance. Temperature test to collect specimens of relevant parameters, such as environmental parameters, process parameters, plastic ( including activation temperature, ex-factory date, spraying times ), PVC parameters ( thickness, gum, and other manufacturers ), processing time, display time.
In the constant temperature box for temperature test, the test temperature respectively *0 degrees, *0 C, *0 degrees C, *5 degrees C, *0 degrees C, *5 degrees C, *0 degrees C. From low to high in each temperature point for 1 hours, then check the specimen surface and edge of the PVC is stripped or open edge, if low level temperature without stripping or open, and when the rising level of temperature stripping or open boundary, then the test sample temperature for low level temperature. A specimen at *0 degrees C test 1 hours PVC not peel or open edge, *0 degrees C test 1 hours PVC stripping or open boundary, then the test sample temperature is *0 C.
4, Common quality problems
4.1 fold
(1) the long and narrow spacing of the workpiece is too small;
(2) plate upper surface around corners without chamfer;
(3) the workpiece transversely of the longitudinal spacing in a straight line, increases the air flow resistance;
(4) the set temperature;
(5) to set pressure for long periods of time.
4.2 white
(1) set the temperature too high;
(2) to set pressure for long periods of time;
(3) linear inappropriate.
4.3 the edge:
(1) adhesive quality is not good;
(2) adhesive activation temperature is too high;
(3) the temperature of the equipment is not up to the requirements of the workpiece edge activation temperature;
(4) a workpiece pad is not appropriate;
(5) film adhesive performance is not good or no gum;
(6) gel has expired or does not match the storage and requirements;
(7) leakage adhesive or glue method is improper.
When occurrence quality problem, should be aimed at afore-mentioned reasons by adjusting process parameters or not and make a record, while adjusting the number of parameters or process, otherwise the quality the real cause of the problem is difficult to identify, but also difficult to formulate and adjust the production environment and technology standards to provide the objective basis.