Process for assisting waste discharge by utilizing die cutting waste

Abstract

The invention discloses a method for assisting waste discharge through die cutting waste, and belongs to the technical field of die cutting machining. According to the method, a closed knife line is arranged on a first knife roll, and first material die cutting waste is divided into internal waste and external waste; after a second material is compounded to the first material, the second material is subjected to die cutting through a second knife roller; and the first internal waste and the connected second material external waste are discharged together through the waste discharging mechanism. According to the method, different working modes are selected according to the bonding characteristics of the second material appearance waste and the bottom supporting film, or waste discharge is assisted by utilizing the higher bonding force between the first internal waste and the bottom supporting film; or the first internal waste is used for shielding the bottom supporting film, the contact area of the second material appearance waste and the bottom supporting film is reduced, separating force is reduced, and waste discharging is assisted. An additional waste discharge die is not needed, waste discharge is assisted by die cutting waste, and the method has the advantages that cost is reduced, efficiency is improved, the waste discharge effect is improved, and application is wide.

Description

Technical Field

[0001] The invention relates to the field of die cutting technology, and in particular to a process for assisting waste discharge by utilizing die cutting waste. Background Art

[0002] Die-cutting plays an important role in the consumer electronics industry. As consumer electronic terminal devices such as laptops and tablets are based on thinness and simplicity of design, products are gradually tending towards multi-body integration and complex structures. Therefore, achieving an economical and high-precision processing model is the primary task of die-cutting processing.

[0003] As the link between die-cutting production efficiency and product quality, die-cutting waste discharge is one of the main technical bottlenecks in die-cutting processing to ensure high efficiency and high quality production. At present, a variety of waste discharge methods have been derived for different products, and the technology is very mature, such as ejector knife waste discharge (such as Figure 1 (a)), extraction roller waste (such as Figure 1 (b)), drop-type waste discharge (such as Figure 1 (c)), blowing / suction exhaust (such as Figure 1 (d)) etc. In addition, various new waste discharge devices have also been developed like mushrooms after rain, such as an auxiliary mechanism for pressure-sensitive self-adhesive label die-cutting waste discharge proposed in Chinese patent CN217807855U, an automatic waste discharge die-cutting machine proposed in Chinese patent CN117863280A, etc.

[0004] However, it can be found from the new waste discharge methods proposed in relevant patent documents that die-cutting waste discharge is highly dependent on various waste discharge molds (such as extraction rollers, ejector rollers, suction / blowing waste rollers, new waste discharge devices, etc.), which are single and diverse, so that waste from different products needs to be discharged using specific waste discharge molds, which has poor universality. At the same time, adding waste discharge molds will make the die-cutting process more complicated, increase the number of workstations, and reduce the production rate, further leading to a decrease in production efficiency. The addition of various waste discharge molds will affect the management of the molds and the occupancy of storage space. Therefore, it is extremely important to carry out die-cutting waste discharge reasonably and effectively. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a process for utilizing die-cutting waste to assist in waste discharge, which can effectively solve the problem of extremely poor universality of waste discharge molds in the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a process for assisting waste discharge by using die-cutting waste, comprising the following steps: 1. Provide a first knife roller and a second knife roller; the first knife roller is provided with a first outer shape knife line for die-cutting a first material, and at least one closed knife line located outside the first outer shape knife line; 2. The second knife roller is provided with a second outer shape knife line for die-cutting the second material; Feeding the first material into a first knife roller for die-cutting to form a first material shape and first material die-cutting waste located outside the first material shape; The closed cut line forms a closed cut mark on the first material, dividing the die-cutting waste of the first material into a first internal waste and a first external waste; wherein the first internal waste is defined by the closed cut line, and the first external waste is located between the closed cut line and the first outer shape cut line; 3. Compounding the second material onto the first material after being die-cut by the first knife roller; Fourth, feeding the first material compounded with the second material into a second knife roller for die cutting to form the second material shape; the position of the second shape knife line corresponds to the area of ​​the first external waste material, and the size of the second shape knife line is larger than the size of the closed knife line; 5. The first internal waste and the waste outside the second material shape connected to the first internal waste are discharged together through the waste discharge mechanism.

[0007] Further, in the first waste discharge mode, when the adhesive force between the second material outer shape waste and the bottom film is less than the adhesive force between the first internal waste and the bottom film, the higher adhesive force between the first internal waste and the bottom film is used to assist in discharging the second material outer shape waste; The second waste discharge mode: when the shape of the second material shape waste is irregular and the adhesion between the second material shape waste and the base film is large, the first internal waste is used to partially shield the base film to reduce the contact area between the second material shape waste and the base film, thereby reducing the separation force between the second material shape waste and the base film, thereby assisting in discharging the second material shape waste.

[0008] Further, the adhesive properties include adhesive force and / or waste shape.

[0009] Furthermore, when the first waste discharge mode is executed, the higher adhesion between the first internal waste and the base film assists in discharging the waste in the second material shape.

[0010] Furthermore, when the second waste discharge mode is executed, the contact area between the waste in the shape of the second material and the bottom film is reduced, thereby lowering the separation force between the waste and the bottom film, thereby assisting in discharging the waste in the shape of the second material.

[0011] Furthermore, the first material is a single-sided / double-sided adhesive or a material without adhesive backing.

[0012] Furthermore, the second material is a main material or a covering film on the product.

[0013] The closed knife line is a continuous closed curve or a closed figure composed of a plurality of discontinuous knife line segments.

[0014] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: (1) The prior art relies on various special waste discharge molds or devices (such as ejector rollers, extraction rollers, waste suction / blowing devices, etc.), which require the design and manufacture of special molds for different products and waste shapes, resulting in high mold costs. At the same time, the use of waste discharge molds usually requires additional equipment investment. The present invention cleverly uses the waste generated during the die-cutting process as a tool to assist in waste discharge, without the need to design and manufacture special waste discharge molds, which greatly reduces mold costs. At the same time, the method can be directly implemented on existing die-cutting equipment without the need for additional equipment investment, further reducing production costs.

[0015] (2) The use of waste discharge molds in the prior art usually increases the number of die-cutting stations, prolongs the production cycle, and reduces production efficiency. Moreover, different products require the replacement of different waste discharge molds, which also increases the mold change time, further affecting production efficiency. The present invention: reduces the number of die-cutting stations, simplifies the die-cutting process, and shortens the production cycle. At the same time, the method is more adaptable to different products, does not require frequent mold replacement, and improves production efficiency.

[0016] (3) In the prior art, for some special materials (such as release films with low viscosity or foils with high viscosity and irregular shapes) or special-shaped products, the existing waste discharge method may cause problems such as waste discharge difficulty, waste leakage, and waste breakage, which affects the product yield.

[0017] The present invention: According to different application scenarios (the strength of adhesion and whether the waste shape is regular or not), different working principles (bonding or shielding) are adopted to achieve auxiliary waste discharge, which effectively solves the waste discharge problem of special materials or special-shaped products, avoids the problems of waste leakage, difficulty in discharge, breakage, etc., and improves the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is the die-cutting waste discharge principle diagram of the prior art; Figure 2 It is a schematic diagram of the die-cutting waste removal work of the prior art; Figure 3 This is a schematic diagram of the auxiliary waste discharge principle of die-cutting waste of the present invention; Figure 4 It is a schematic diagram of the force of the waste material of the present invention; Figure 5 Schematic diagram of the knife lines of the first knife roller (a) and the second knife roller (b) in Example 1 of the present invention; Figure 6 This is a schematic diagram of the process route of Example 1 of the present invention; Figure 7 Schematic diagram of the knife lines of the first knife roller (a), the second knife roller (b) and the third knife roller (c) in Example 2 of the present invention; Figure 8 This is a schematic diagram of the process route of Example 2 of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The core of the method for auxiliary waste discharge using die-cutting waste proposed in the present invention is to use the closed knife line set on the first knife roller to divide the die-cutting waste of the first material into first internal waste and first external waste, and to achieve auxiliary waste discharge of the external shape waste of the second material through the first internal waste.

[0022] The method for assisting waste discharge by utilizing die-cutting waste of the present invention comprises the following steps: 1. Provide a first knife roller and a second knife roller; The first knife roller is provided with a first outer shape knife line for die-cutting the first material, and at least one closed knife line located outside the first outer shape knife line; The second knife roller is provided with a second outer shape knife line for die-cutting the second material; 2. Feeding the first material into a first knife roller for die-cutting to form a first material shape and first material die-cutting waste located outside the first material shape; The closed cut line forms a closed cut mark on the first material, dividing the die-cutting waste of the first material into a first internal waste and a first external waste; wherein the first internal waste is defined by the closed cut line, and the first external waste is located between the closed cut line and the first outer shape cut line; 3. Compounding the second material onto the first material after die-cutting by the first knife roller; 4. Feeding the first material compounded with the second material into the second knife roller for die cutting to form the shape of the second material; The position of the second outer shape cut line corresponds to the area of ​​the first outer waste material, and the size of the second outer shape cut line is greater than the size of the closed cut line; 5. The first internal waste and the waste outside the second material shape connected to the first internal waste are discharged together through the waste discharge mechanism. According to the different bonding characteristics between the waste outside the second material shape and the supporting film of the carrier material, this method can select two different working modes: First waste discharge mode: when the adhesion between the second material shape waste and the base film is less than the adhesion between the first internal waste and the base film, the higher adhesion between the first internal waste and the base film is used to assist in discharging the second material shape waste.

[0023] The second waste discharge mode: when the shape of the second material shape waste is irregular and the adhesion between the second material shape waste and the base film is large, the first internal waste is used to partially shield the base film to reduce the contact area between the second material shape waste and the base film, thereby reducing the separation force between the second material shape waste and the base film, thereby assisting in discharging the second material shape waste.

[0024] The method of the present invention is described in detail below through specific embodiments: Example

[0025] For the situation where the adhesion between the second material shape waste and the bottom film is low (corresponding to the first waste discharge mode); This embodiment is described by taking double-sided adhesive as the first material and release film as the second material as an example. Figure 5 and Figure 6 shown.

[0026] The settings of the first and second knife rollers: The first knife roller is provided with a double-sided adhesive tape outer shape knife line (corresponding to the first outer shape knife line) for die-cutting the double-sided adhesive tape, and a closed knife line (corresponding to the first outer shape knife line) located outside the double-sided adhesive tape outer shape knife line. Figure 5 (a)). The closed knife line can be a continuous closed curve or a closed figure composed of multiple discontinuous knife line segments.

[0027] The second knife roller is provided with a release film outer shape knife line (corresponding to the second outer shape knife line) for die-cutting the release film (such as Figure 5 (as shown in (b)).

[0028] Double-sided tape die cutting: The double-sided adhesive tape is fed into the first knife roller for die-cutting, forming the double-sided adhesive tape shape and the double-sided adhesive tape die-cutting waste outside the double-sided adhesive tape shape. The closed knife line forms a closed cut on the double-sided adhesive tape, dividing the double-sided adhesive tape die-cutting waste into internal waste (the part surrounded by the closed knife line) and external waste (the part between the closed knife line and the double-sided adhesive tape shape knife line).

[0029] Release film compound: The release film is compounded onto the double-sided adhesive tape after die-cutting by the first knife roller, and the release film is located above the double-sided adhesive tape. Die-cutting of release film: The double-sided adhesive tape compounded with the release film is fed into the second knife roller for die-cutting to form the release film shape. The position of the release film shape knife line corresponds to the outer waste area of ​​the double-sided adhesive die-cutting waste, and the size of the release film shape knife line is larger than the size of the closed knife line.

[0030] Waste discharge: The internal waste of the double-sided adhesive die-cut waste and the release film external waste connected to the internal waste are discharged together through the high-viscosity film (or other waste discharge mechanism) attached from the bottom. Since the adhesive force between the release film external waste and the base film is smaller than the adhesive force between the internal waste of the double-sided adhesive die-cut waste and the base film, the release film external waste can be effectively peeled off from the base film and discharged through the higher adhesive force between the internal waste of the double-sided adhesive die-cut waste and the base film, thus realizing auxiliary waste discharge.

[0031] In this embodiment, the first material passes through the first knife roller, and the knife line only cuts through the first material, cutting out its shape (green pieces) and the die-cutting waste (orange pieces) within the closed knife line. Figure 3 (a); Then, the second material is compounded on the first material shape and the die-cutting waste, and the second material shape (black block) is cut out after passing through the second knife roller. At this time, the knife line will cut through the red base film; the waste is discharged from the bottom through the high-viscosity film attached from the bottom of the steel roller; in the whole process, since the knife line of the second material does not overlap with the knife line of the first material, the knife line of the second material shape will neither cut the first material shape nor the die-cutting waste. Example

[0032] For the second material shape waste with strong adhesion to the bottom film and irregular shape (corresponding to the second waste discharge mode); This embodiment is described by taking unadhesive PET as the first material and foil as the second material as an example. Figure 7 and Figure 8 shown.

[0033] The settings of the first knife roller, the second knife roller and the third knife roller: The first knife roller is provided with a non-adhesive PET outer shape knife line (corresponding to the first outer shape knife line) for die-cutting the non-adhesive PET, and a closed knife line (corresponding to the first outer shape knife line) located outside the non-adhesive PET outer shape knife line. Figure 7 The second knife roller is provided with a knife line (such as Figure 7 (b)). The third knife roller is provided with a foil outer shape knife line (corresponding to the second outer shape knife line) for die-cutting the foil (as shown in FIG. Figure 7 (c)).

[0034] Die-cutting of unadhesive PET: The unadhesive PET is fed into the first knife roller for die-cutting to form an unadhesive PET shape and unadhesive PET die-cutting waste outside the unadhesive PET shape. The closed knife line forms a closed cut on the unadhesive PET, dividing the unadhesive PET die-cutting waste into internal waste and external waste.

[0035] Foil compounding: Compound the foil onto the un-adhesive PET after the first roller die-cutting, with the foil located on top of the un-adhesive PET.

[0036] Pretreatment of foil: Feed the un-adhesive PET laminated with foil into the second knife roller to remove the holes in the foil.

[0037] Die cutting of foil: The pre-treated foil and unadhesive PET are fed into the third knife roller for die cutting to form the foil profile. The position of the foil profile cut line corresponds to the outer waste area of ​​the unadhesive PET die cutting waste, and the size of the foil profile cut line is larger than the size of the closed cut line.

[0038] Waste discharge: The internal waste of the un-adhesive PET die-cutting waste and the foil shape waste connected to the internal waste are discharged together through the waste discharge mechanism. Since the foil shape waste has an irregular shape and has a strong adhesion to the base film, the internal waste of the un-adhesive PET die-cutting waste covers part of the base film, reducing the contact area between the foil shape waste and the base film, thereby reducing the separation force between the foil shape waste and the base film, avoiding the breakage of the foil shape waste during the waste discharge process, and achieving smooth waste discharge.

[0039] In this embodiment, the second knife roller cuts out the second material shape (black block) as shown in FIG. Figure 3 (b), at this time, the knife line only cuts through the second material; The waste of the second material shape is pulled up and discharged; Since D1<D2 and the second material has high viscosity, the die-cutting waste can be completely covered by the second material shape waste and discharged together, and will not remain in the base film or product area.

[0040] The difference between Example 2 and Example 1 is that the second material is of a special shape. Figure 3 (b) If the second material shape waste is irregular (such as Figure 4 (b)), and when the first material die-cutting waste is firmly bonded to the base film, the introduction of the first material die-cutting waste will reduce the contact area between the shape waste and the base film, which greatly reduces the separation force between the shape waste and the base film, avoiding uneven force on the shape waste (such as Figure 4 (b)) causes the waste to be pulled apart, thereby greatly improving the production speed and efficiency of the die-cutting waste removal process.

[0041] The first material is PET without adhesive backing, and the second material is foil. The waste discharge device also includes a third die-cutting roller, on which a foil shape is integrated.

[0042] The shaded area is the foil shape waste (such as Figure 7 (c)) When the waste is discharged, due to the existence of irregular-shaped areas of the waste, Figure 4 (b) The situation of uneven force results in the waste material breaking, which affects the waste discharge effect. When the unadhesive PET die-cutting waste is introduced, it shields part of the adhesion between the foil and the bottom protective film, reduces the separation force, and avoids the risk of waste material breaking to a certain extent.

[0043] The "first material" described in the present invention can be a single / double-sided adhesive or a non-adhesive material, such as double-sided adhesive, PET, PP, etc. The "second material" described in the present invention can be a main material or a cover film on the product, such as a release film, a foil, a PET film, etc. The "bottom film" described in the present invention is a carrier for carrying the first material and the second material. The "closed knife line" described in the present invention can be a continuous closed curve, or a closed figure composed of multiple discontinuous knife line segments, and its specific shape can be designed according to actual needs. The "waste discharge mechanism" described in the present invention can be a high-viscosity film that is attached from below, or it can be other types of waste discharge mechanisms, such as a waste suction device, etc. The "first knife roller" and "second knife roller" described in the present invention are existing knife rollers on the die-cutting equipment, and there is no need to add additional waste discharge molds or devices.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for assisting waste discharge using die-cutting waste, characterized in that: The following steps are involved:

1. Provide a first knife roller and a second knife roller; the first knife roller is provided with a first outer shape knife line for die-cutting a first material, and at least one closed knife line located outside the first outer shape knife line; 2. The second knife roller is provided with a second outer shape knife line for die-cutting the second material; Feeding the first material into a first knife roller for die-cutting to form a first material shape and first material die-cutting waste located outside the first material shape; The closed cut line forms a closed cut mark on the first material, dividing the die-cutting waste of the first material into a first internal waste and a first external waste; wherein the first internal waste is defined by the closed cut line, and the first external waste is located between the closed cut line and the first outer shape cut line; 3. Compounding the second material onto the first material after being die-cut by the first knife roller; Fourth, feeding the first material compounded with the second material into a second knife roller for die cutting to form the second material shape; the position of the second shape knife line corresponds to the area of ​​the first external waste material, and the size of the second shape knife line is larger than the size of the closed knife line; 5. The first internal waste and the waste outside the second material shape connected to the first internal waste are discharged together through the waste discharge mechanism.

2. A process for auxiliary waste discharge using die-cutting waste according to claim 1, characterized in that: According to the bonding characteristics between the waste material in the second material shape and the supporting film of the carrier material, the first waste discharge mode or the second waste discharge mode is selected; First waste discharge mode: when the adhesion between the second material outer shape waste and the bottom film is less than the adhesion between the first internal waste and the bottom film, the higher adhesion between the first internal waste and the bottom film is used to assist in discharging the second material outer shape waste; The second waste discharge mode: when the shape of the second material shape waste is irregular and the adhesion between the second material shape waste and the base film is large, the first internal waste is used to partially shield the base film to reduce the contact area between the second material shape waste and the base film, thereby reducing the separation force between the second material shape waste and the base film, thereby assisting in discharging the second material shape waste.

3. A process for auxiliary waste discharge using die-cutting waste according to claim 2, characterized in that: The bonding properties include bonding force and / or scrap shape.

4. A process for assisting waste discharge using die-cutting waste according to claim 2, characterized in that: When the first waste discharge mode is executed, the second material shape waste is discharged with the assistance of the higher adhesion between the first internal waste and the base film.

5. The process of using die-cutting waste to assist waste discharge according to claim 2, characterized in that: When the second waste discharge mode is executed, the contact area between the waste in the shape of the second material and the support film is reduced, thereby lowering the separation force between the waste and the support film, thereby assisting in discharging the waste in the shape of the second material.

6. The process of using die-cutting waste to assist waste discharge according to claim 2, characterized in that: The first material is a single-sided / double-sided adhesive or a material without adhesive backing.

7. The process of using die-cutting waste to assist waste discharge according to claim 2, characterized in that: The second material is the main material or a covering film on the product.

8. The process of using die-cutting waste to assist waste discharge according to claim 2, characterized in that: The closed knife line is a continuous closed curve or a closed figure composed of a plurality of discontinuous knife line segments.

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