CN219467387U - Flexographic plate hanging film base - Google Patents

Abstract

The utility model provides a flexible plate hanging film base, which not only solves various defects and defects of size deformation, lifting, dislocation and the like of a foam pasting adhesive tape stuck on a roller in the repeated use process, but also overcomes the defects that when the traditional hanging film base is used, too much time is consumed in the process of pasting a double-sided adhesive tape on the back of a printing plate, the printing plate is difficult to separate from the film base in the secondary pasting process, adhesive residues and the like are overcome, and is beneficial to further improving the flexible plate making efficiency.

Description

Flexographic plate hanging film base

Technical Field

The utility model belongs to the field of printing equipment consumables in flexographic printing, and particularly relates to a flexographic plate hanging sheet base.

Background

Flexography is usually carried out by using environment-friendly water ink and UV ink with high fluidity, and is a relatively environment-friendly printing mode. During printing, the ink is firstly transferred to a printing plate roller through an anilox roller to be contacted with an image-text part on the surface of the printing plate, so that the printing plate is uniformly and stably inked, then the printing pressure is applied by the printing plate roller, the ink on the printing plate is transferred to a printing stock, and finally the printing plate is dried, so that the whole printing process is finished. In this process, it is important how to attach the manufactured flexible resin printing plate with the graphics to a precise position.

At present, three modes of plate pasting during flexographic printing are mainly adopted, one is a developed self-adhesive plate roller represented by Twinlock company, the surface layer of the plate roller is provided with a self-adhesive material, and a printing plate can be directly pasted with the self-adhesive plate roller; the second is to paste the special double-sided tape of the flexible edition on the cylinder of the printer in advance, laminate the printing plate and cylinder before printing; and thirdly, using a plate hanging base, namely, positioning the plate hanging base according to the designed image-text position requirement, and then adhering a double-sided adhesive tape on the back of the manufactured printing plate by a user to the corresponding position of the plate hanging base.

The self-adhesive plate roller is a novel plate sticking process, and a layer of foam pad and a layer of special adhesive material are stuck on the surface of the original plate roller (which can be a sleeve or a metal plate roller), and the material has viscosity, so that the back surface of the printing plate can be directly fixed on the plate roller without sticking a double-sided adhesive tape. The method for attaching the plate has the main advantages that: the time spent by a user on attaching and detaching the plate is relatively less, the adhesive material belt on the surface of the roller can be reused after being cleaned, the registering precision is relatively higher, the storage condition is simple, and the printing machine is suitable for the condition of frequent plate replacement during printing. However, the method has obvious defects, mainly including complicated cleaning process of the roller surface; and the self-adhesive roller is high in price, the surface of the self-adhesive roller is damaged after being repeatedly used for a certain time, the self-adhesive roller can lose viscosity quickly, and the replacement cost is relatively high.

The double-sided adhesive tape is adhered to the special plate roller, which is a traditional flexible plate adhering process and has a certain similarity with the self-adhesive plate roller process. The foam pad and the double-sided adhesive tape are stuck on the printing plate roller in advance, so that the surface of the plate roller has 'viscosity', the manufactured flexible plate printing plate can be directly stuck according to the position, and after the printing is finished and the printing plate is removed, the double-sided adhesive tape on the plate roller still has good viscosity and can be repeatedly used. The method has the advantages of high registration accuracy, and is relatively suitable for printing with simple varieties and large printing quantity of single varieties, especially for printing with flexible plate materials with thickness of 2.84mm and below. However, when the printing plate is repeatedly removed and replaced during the repeated use of the adhesive tape, the adhesive tape is wholly or partially carried up or moved and misplaced from the sleeve, which can affect the reusability and production efficiency of the adhesive tape, and the double-sided adhesive tape has the problem of relatively high use cost.

The use of a flexographic plate support is another common process for plate attachment. The current common flexible plate hanging film base mainly comprises a hanging plate strip and a film base which are connected, pattern outlines are manufactured on the film base in advance by a flexible plate typesetting scribing machine before use, positioning is performed, after a user finishes making a plate, double-sided adhesive tape is stuck on the back of a plate, then the pattern positions on the film base are compared for pasting, and then the hanging plate strip is used for fixing with a printing plate roller. The plate pasting method has the advantages that: the cost is relatively low, the operation after printing is finished is relatively convenient, namely, the printing plate and the plate hanging base are regarded as a whole to be directly taken down, and the printing plate is convenient to store. There are also some disadvantages: (1) in the process of pasting double-sided adhesive on the back of the printing plate, the user needs more time; (2) the double-sided adhesive tape for plate pasting has larger viscosity, and once the pasting between the printing plate and the pattern contour is inaccurate, when the printing plate needs to be torn off and re-pasted, the printing plate and the film base are difficult to separate, and a lot of residues exist on the back surface.

Disclosure of Invention

In order to solve the problems, the utility model provides the flexible plate hanging sheet base, which not only solves various defects and defects of size deformation, lifting, dislocation and the like of the foam pasting adhesive tape stuck on the roller in the repeated use process, but also overcomes the defects of too much time consumption, difficult separation, adhesive residue and the like in the process of sticking the double-sided adhesive tape on the back of the printing plate and the sheet base in the process of sticking the double-sided adhesive tape on the back of the printing plate when the traditional plate hanging sheet base is used, and is beneficial to further improving the flexible plate making efficiency.

The object of the utility model is achieved in the following way: a flexible plate hanging plate base comprises a base material, a pressure-sensitive adhesive layer and a release material protective layer from bottom to top.

The base material is a plastic sheet base with the thickness of 100-300 mu m, and the plastic sheet base is made of polyethylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene or polyimide.

The thickness of the plastic sheet base is 125-250 um, and the plastic sheet base is polyethylene terephthalate or polypropylene extruded by adopting a double screw process.

The thickness of the pressure-sensitive adhesive layer is 1-30 mu m; the thickness of the release material protective layer is 10-50 mu m.

The thickness of the pressure sensitive adhesive layer is 3-15um.

The release material protective layer is made of a film, release paper and non-woven fabric foam; the pressure-sensitive adhesive layer is made of rubber type, vinyl ether type, organosilicon type, acrylic ester type or isoprene type.

The rubber type pressure-sensitive adhesive layer is made of natural rubber, thermoplastic rubber or copolymer rubber.

The acrylic pressure-sensitive adhesive layer is a polyacrylate pressure-sensitive adhesive layer.

Hanging strips are respectively arranged on the lower surfaces of the two sides of the base material.

Compared with the prior art, the plate hanging substrate provided by the utility model not only solves various defects and defects of size deformation, lifting, dislocation and the like of the foam plate pasting adhesive tape stuck on the roller in the repeated use process, but also overcomes the defects of too much time consumption, difficult separation, adhesive residue and the like in the process of sticking the double-sided adhesive tape on the back of the printing plate, and is beneficial to further improving the plate-making efficiency of the flexible plate.

The plate hanging substrate provided by the utility model has the advantages that the self surface is provided with the pressure-sensitive adhesive layer, so that the time for pasting a double-sided adhesive tape on the back surface of a printing plate is not required, and only the release type protective layer on the pressure-sensitive adhesive layer of the substrate is required to be removed. In addition, the material of the plate hanging substrate is very similar to the material of the support substrate used for producing the flexible plate, the pressure-sensitive adhesive layer has more moderate bonding force compared with the effect of the double-sided adhesive tape for pasting, and the residual adhesive on the plate surface after secondary separation is less, so that the bonding force between the plate hanging substrate and the flexible plate support is very good after pasting, and the long-term use of the printing plate is ensured not to fall off; meanwhile, the pressure-sensitive adhesive layer has more moderate adhesive force, and residual adhesive on the layout after secondary separation is less, so that secondary separation between the printing plate support and the plate hanging substrate is facilitated, and quick correction of the phenomenon of inaccurate printing plate pasting is facilitated.

Drawings

FIG. 1 is a schematic structural view of a flexographic hanger plate substrate of the present utility model.

FIG. 2 is a schematic illustration of the structure of a flexographic hanger plate substrate with hanger plate bars of the present utility model.

Detailed Description

The present utility model will now be described in detail with reference to specific examples, which are given herein for further illustration only and are not to be construed as limiting the scope of the utility model, since numerous insubstantial modifications and adaptations thereof will now occur to those skilled in the art in light of the foregoing disclosure.

As shown in fig. 1 and 2, a flexographic hanging plate base is characterized in that: the flexible plate hanging plate base comprises a base material 1, a pressure sensitive adhesive layer 2 and a release material protective layer 3 from bottom to top.

Hanging strips 4 are respectively arranged on the lower surfaces of the two sides of the base material 1.

The substrate is a plastic sheet base with the thickness of 100-300 mu m, and the plastic sheet base is any one of polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polyethylene naphthalate (PEN), polyethylene (PE), polypropylene (PP) and Polyimide (PI). Polyethylene terephthalate (PET) or polypropylene (PP) extruded using a twin screw process is preferred.

The thickness of the plastic sheet base is 125-250 um, and the plastic sheet base is polyethylene terephthalate or polypropylene extruded by adopting a double screw process.

The thickness of the pressure-sensitive adhesive layer is 1-30 mu m; preferably, the thickness of the pressure sensitive adhesive layer is 3-15um.

If the coated adhesive layer is too thin, the bonding strength between the printing plate and the hanging plate base cannot be ensured, and the edge of the printing plate is easily tilted or even falls off from the hanging plate base in a certain link before, during or after printing, so that the printing process or the normal use of the printing plate is affected; if the applied gum layer is too thick, since the printing plate is subjected to continuous pressure and high temperature during printing, the pressure-sensitive adhesive layer is relatively fluid due to melt softening under such conditions, resulting in offset dislocation of the printing plate, so that the printing effect cannot be expected. And the coated adhesive layer is too thick, and the product cost is increased.

The thickness of the release material protective layer is 10-50 mu m.

The release material protective layer is made of a film, and is at least one of release paper, non-woven fabrics and foam; the film type release material protective layer can be any one of polypropylene (PP), polyethylene (PE), polyester (PET), nylon (PA) and polyvinyl chloride (PVC). Polyethylene terephthalate (PET) or nylon (PA) is preferred. The plate hanging strip can be made of PVC.

The pressure-sensitive adhesive layer is made of one of rubber type, vinyl ether type, organosilicon type, acrylic ester type or isoprene type. Rubber-based pressure-sensitive adhesives or acrylate-based pressure-sensitive adhesives are preferred.

The rubber type pressure-sensitive adhesive layer is made of at least one of natural rubber, thermoplastic rubber and copolymer rubber; thermoplastic rubber or co-butyl rubber is preferred.

The acrylic pressure-sensitive adhesive layer comprises at least one polymer of polyacrylate, polyolefin and vinyl aromatic block copolymer group.

The acrylic pressure-sensitive adhesive layer is a polyacrylate pressure-sensitive adhesive layer, and the polyacrylate pressure-sensitive adhesive layer comprises at least one polyacrylate, wherein at least one polyacrylate component accounts for at least 70% of the weight of the relevant layer, and contains acrylic acid, a monomer, tackifying resin and a crosslinking agent. This formulation of the polyacrylate pressure sensitive adhesive layer was the same as in CN114089603 a. The pressure-sensitive adhesive layer formulations in examples 1-3 of CN114089603a are all one type of pressure-sensitive adhesive layer of the present application.

The preparation method of the flexible plate hanging sheet base comprises the following steps: coating the coating liquid prepared by the raw materials of the pressure-sensitive adhesive layer on the base material 1, drying at 110-116 ℃ for 48-72 h to form the pressure-sensitive adhesive layer 2, and then covering the release material protective layer 3 for rolling.

According to the practical application, cutting processes such as rolling marks, rolling lines and the like can be added on the surface of the release material protective layer 3 in advance so as to facilitate the removal of the protective layer.

The using method of the flexible plate hanging film base is as follows: after the release material protective layer is stripped off, the back surface of the support of the flexible plate material subjected to plate making is closely attached to the plate hanging sheet base through the pressure sensitive adhesive layer, and after the attachment, the adhesive force between the plate support and the plate hanging sheet base is more than or equal to 10N/1.5cm and less than or equal to 30N/1.5cm. Ensures that the plate material and the plate hanging substrate do not fall off during high-speed printing, and can be stored for a long time. And the residual glue on the layout after the secondary separation is less, and the secondary separation between the printing plate support and the hanging plate substrate is convenient, so that the phenomenon of inaccurate printing plate pasting can be corrected quickly.

Compared with the prior art, the plate hanging substrate provided by the utility model not only solves various defects and defects of size deformation, lifting, dislocation and the like of the foam plate pasting adhesive tape stuck on the roller in the repeated use process, but also overcomes the defects of too much time consumption, difficult separation, adhesive residue and the like in the process of sticking the double-sided adhesive tape on the back of the printing plate, and is beneficial to further improving the plate-making efficiency of the flexible plate.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The pressure-sensitive adhesive layer 2 is a polyacrylate pressure-sensitive adhesive layer, and specifically comprises: 70g of polymethacrylate (Sigma Co.), 15g of isooctyl acrylate, 12g of acrylic acid, 1.0g of benzoyl peroxide and 80/isopropyl alcohol (85:15) and 80/g are polymerized and copolymerized in a reaction bottle to obtain a copolymer, 15g of rosin modified resin (Szechwan chemical) is added and mixed to obtain a pressure-sensitive adhesive layer coating liquid, the coating liquid is coated on a substrate 1 through a single screw extruder, and then the pressure-sensitive adhesive layer is formed after drying at 110-160 ℃ for 48 hours. The thickness of the pressure-sensitive adhesive layer 2 after drying is 3 to 15um.

In one step, the corresponding sheet base size is cut according to the size of the printing roller before printing, a proper plate hanging strip is selected, and the plate hanging sheet base and the plate hanging strip are subjected to lasting adhesion and combination through an ultrasonic cold bonding technology.

The use method of the plate hanging substrate in the utility model is as follows: firstly, a flexible typesetting scribing machine is used for manufacturing pattern outlines on a plate hanging base in advance, positioning is manufactured, then the release type material protective layer 3 is torn off, and finally, the manufactured printing plate is directly adhered to the pressure-sensitive adhesive layer 2, so that the plate pasting process is completed.

The release film layer was removed from the release film layer on the release film layer with the pressure-sensitive adhesive layer in the above example, the thickness of the pressure-sensitive adhesive layer was 15um, the material of the base material 1 was PET, and the sample was produced by directly bonding with the support for current lekawa optical flexography production (support disclosed in CN 200610107057.7), and simulating the bonding state. After the plate was attached, the adhesive strength between the support and the plate carrier was measured with reference to "test method for peel strength of adhesive tape of GB/T2792-2014", 3 15mm by 200mm plates were cut in parallel with a cutter, and the plate was peeled off at a constant speed (200 mm/min) at an angle of 180℃using a BLD-200S electronic peel tester (Jinan optical mechanical and electrical technique Co., ltd.), and the measured value was used as the adhesive force between the flexographic plate and the plate carrier. The results of the 3 replicates are shown in table 1 below:

table 1 adhesion case in examples

In addition to the above evaluation method, the hanger plate base according to the present utility model can be evaluated by the following method: after the surface of the prepared flexible plate printing plate support body and the self-adhesive plate base in the utility model are directly printed on a machine, the printing paper box 20 is printed over ten thousand, and the adhesion condition of the support body and a printing roller in printing and the quality of a printed product, such as whether pattern register is accurate, whether offset occurs or not, and the like are observed.

Compared with the traditional plate pasting mode, the plate hanging base with the self-adhesive layer for flexographic printing does not need to be pasted with a double-sided adhesive tape during printing, so that a great deal of labor and time cost is saved; the bonding force between the printing plate support body and the plate hanging substrate is more than or equal to 10N/1.5cm and less than or equal to 30N/1.5cm, so that the printing plate is prevented from peeling off the edge or falling off integrally in the printing process; meanwhile, the method overcomes the defects that when the traditional hanging plate base is used, the time is too long in the process of pasting the double-sided tape on the back of the printing plate, the printing plate and the base are difficult to separate when being necessarily pasted for the second time, the adhesive remains and the like, and effectively improves the plate making efficiency of the flexible plate.

While only the preferred embodiments of the present utility model have been described above, the scope of the present utility model is not limited thereto, and it should be noted that equivalents and modifications, variations and improvements made according to the technical solution of the present utility model and the inventive concept thereof, as well as those skilled in the art, should be considered as the scope of the present utility model, without departing from the general inventive concept thereof.

Claims (8)

1. A flexographic plate hanging substrate, characterized in that: the flexible plate hanging plate base sequentially comprises a base material (1), a pressure-sensitive adhesive layer (2) and a release material protective layer (3) which are attached to a plate support body from bottom to top, wherein hanging plate strips (4) are respectively arranged on the lower surfaces of two sides of the base material (1), and the adhesive force between the plate support body and the hanging plate base is greater than or equal to 10N/1.5cm and less than or equal to 30N/1.5cm.

2. The flexographic hanger plate base of claim 1, wherein: the base material is a plastic sheet base with the thickness of 100-300 mu m, and the plastic sheet base is made of polyethylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene or polyimide.

3. The flexographic hanger plate base of claim 2, wherein: the thickness of the plastic sheet base is 125-250 um, and the plastic sheet base is polyethylene terephthalate or polypropylene extruded by adopting a double screw process.

4. The flexographic hanger plate base of claim 1, wherein: the thickness of the pressure-sensitive adhesive layer is 1-30 mu m; the thickness of the release material protective layer is 10-50 mu m.

5. The flexographic hanger plate base of claim 4, wherein: the thickness of the pressure sensitive adhesive layer is 3-15um.

6. The flexographic hanger plate base of claim 1, wherein: the release material protective layer is made of a film, release paper, non-woven fabric or foam; the pressure-sensitive adhesive layer is made of rubber type, vinyl ether type, organosilicon type, acrylic ester type or isoprene type.

7. The flexographic hanger plate base of claim 6, wherein: the rubber type pressure-sensitive adhesive layer is made of natural rubber, thermoplastic rubber or copolymer rubber.

8. The flexographic hanger plate base of claim 6, wherein: the acrylic pressure-sensitive adhesive layer is a polyacrylate pressure-sensitive adhesive layer.