TWI699267B

TWI699267B - Knife die, stamping method of film using the knife die, and punching device provided with the knife die

Info

Publication number: TWI699267B
Application number: TW106125435A
Authority: TW
Inventors: 杉本篤彦; 仲井宏太; 李信興; 陳莛翔; 高志維; 何幸容
Original assignee: 日商日東電工股份有限公司
Priority date: 2016-08-02
Filing date: 2017-07-28
Publication date: 2020-07-21
Also published as: JP6460537B2; TW201805131A; KR20190020829A; WO2018025619A1; CN109476035B; CN109476035A; KR102044371B1; JP2018020395A

Abstract

本發明提供一種可減少沖壓膜時對該膜賦予之損傷的刀模、使用該刀模之膜之沖壓方法、及具備該刀模之沖壓裝置。本發明之刀模具備：具有封閉之俯視形狀之沖壓刀，及設置於該沖壓刀之外側之副刀。在一實施形態中，上述副刀沿前述沖壓刀且不連續地設置。在一實施形態中，上述沖壓刀之刀高高於上述副刀之刀高。The present invention provides a knife die capable of reducing damage to the film when the film is punched, a method for punching a film using the knife die, and a punching device provided with the knife die. The knife die of the present invention is provided with a punching knife having a closed top view shape, and a secondary knife provided on the outer side of the punching knife. In one embodiment, the auxiliary knife is arranged discontinuously along the punching knife. In one embodiment, the knife height of the punching knife is higher than the knife height of the auxiliary knife.

Description

Knife mold, stamping method of film using the knife mold, and punching device with the knife mold

本發明係關於一種刀模、使用該刀模之膜之沖壓方法、及具備該刀模之沖壓裝置。The present invention relates to a knife die, a stamping method of a film using the knife die, and a stamping device provided with the knife die.

先前，在膜製品之製造中，進行自以大面積獲得之母膜沖壓相應於用途之形狀之膜製品。一般而言，在沖壓母膜時使用具備特定之沖壓刀之刀模。然而，在沖壓時自沖壓刀對膜施加之力不一定均一，在不均一之力施加至製品時，存在膜製品受損傷(例如壓痕、在膜製品係積層體之情形下之剝離等)之情形。尤其是，在偏光板等之光學膜之沖壓中，上述之問題變得顯著。 [先前技術文獻] [專利文獻] [專利文獻1]日本特開2009-56735號公報Previously, in the manufacture of film products, a film product of a shape corresponding to the application was punched from a mother film obtained in a large area. Generally speaking, a die with a specific punching knife is used when punching the mother film. However, the force applied by the stamping knife to the film during stamping is not necessarily uniform. When uneven force is applied to the product, the film product may be damaged (such as indentation, peeling in the case of a film product laminate, etc.) The situation. In particular, the above-mentioned problems become prominent in the pressing of optical films such as polarizing plates. [Prior Art Document] [Patent Document] [Patent Document 1] JP 2009-56735 A

[發明所欲解決之問題] 本發明係為了解決上述先前之課題而完成者，其主要目的在於提供一種可減少沖壓膜時對該膜賦予之損傷的刀模、使用該刀模之膜之沖壓方法、及具備該刀模之沖壓裝置。 [解決問題之技術手段] 本發明之刀模具備：具有封閉之俯視形狀之沖壓刀，及設置於該沖壓刀之外側之副刀。在一實施形態中，上述副刀沿前述沖壓刀且不連續地設置。在一實施形態中，上述沖壓刀之俯視形狀係具有角隅部之形狀，前述副刀至少設置於該角隅部之該沖壓刀之外側。在一實施形態中，上述副刀之俯視形狀係沿前述沖壓刀之角隅且不具有頂點之形狀。在一實施形態中，上述沖壓刀之刀高高於上述副刀之刀高。在一實施形態中，上述沖壓刀與上述副刀之刀高之差為5 μm～700 μm。根據本發明之另一態樣提供一種膜之沖壓方法。該膜之沖壓方法包含使用上述刀模將膜沖壓。在一實施形態中，上述膜係光學膜。在一實施形態中，上述膜係偏光板。根據本發明之又一態樣提供一種膜之沖壓裝置。該膜之沖壓裝置具備上述刀模。 [發明之效果] 根據本發明能夠提供一種藉由在沖壓刀之外側設置副刀而可減少沖壓膜時對該膜賦予之損傷的刀模。[Problems to be Solved by the Invention] The present invention was completed in order to solve the above-mentioned previous problems, and its main purpose is to provide a die that can reduce damage to the film when the film is stamped, and the stamping of the film using the die Method, and punching device provided with the die. [Technical Means to Solve the Problem] The knife die of the present invention is provided with: a punching knife with a closed top view shape, and an auxiliary knife provided on the outer side of the punching knife. In one embodiment, the auxiliary knife is arranged discontinuously along the punching knife. In one embodiment, the shape of the punching knife in plan view is a shape having a corner portion, and the auxiliary knife is provided at least on the outer side of the punching knife of the corner portion. In one embodiment, the top view shape of the auxiliary knife is a shape that follows the corners of the punch knife and does not have a vertex. In one embodiment, the knife height of the punching knife is higher than the knife height of the auxiliary knife. In one embodiment, the difference in blade height between the punching knife and the auxiliary knife is 5 μm to 700 μm. According to another aspect of the present invention, a film stamping method is provided. The film stamping method includes stamping the film using the above-mentioned die. In one embodiment, the above-mentioned film is an optical film. In one embodiment, the above-mentioned film is a polarizing plate. According to another aspect of the present invention, a film stamping device is provided. The film punching device is equipped with the above-mentioned die. [Effects of the Invention] According to the present invention, it is possible to provide a die that can reduce damage to the film when the film is punched by providing an auxiliary knife on the outer side of the punching knife.

A. 刀模圖1係本發明之一實施形態之刀模之概略平面圖。刀模100具備：沖壓刀10、及副刀20。沖壓刀10具有封閉之俯視形狀。在使用刀模100沖壓膜時，利用沖壓刀10沖壓膜。副刀20設置於沖壓刀10之外側。在一實施形態中，副刀20以沿沖壓刀10之方式設置。在圖1中顯示僅具備1組包含沖壓刀及副刀之組的刀模，但本發明之刀模可如圖2所示般具備複數組包含沖壓刀及副刀之組。此外，若使用1組包含沖壓刀及副刀之組，則能夠沖壓1片膜片。在使用本發明之刀模沖壓膜之情形下，在膜與沖壓刀相接之時點對膜施加特定之力，進而將沖壓刀朝膜按壓(或將膜朝沖壓刀按壓)，在沖壓膜時，利用與該膜相接之副刀之作用使對膜施加之力分散。其結果為，可獲得減少膜之損傷、且防止壓痕等的沖壓膜。且，在膜係積層體之情形下，可防止該膜之層間剝離。以下，亦存在為了便於說明將膜與沖壓刀相接之時點稱為接觸時點，將自接觸時點進一步將刀模朝膜按壓之時點(或將膜朝刀模按壓之時點)稱為沖壓時點之情形。此外，膜在沖壓時點被切斷。作為上述沖壓刀及副刀可使用任意之適切的刀物。作為用於沖壓刀及副刀之刀物可例舉例如湯姆遜刀、腐食刀、及雕刻刀等。上述之沖壓刀之俯視形狀可為任意之適切的形狀。作為沖壓刀之俯視形狀可例舉例如大致正方形狀、大致長方形狀、大致圓形狀、及大致橢圓形狀等。且，沖壓刀之俯視形狀可為適宜地組合直線與曲線之形狀、及由曲率不同之複數條曲線構成之形狀。較佳的是，副刀沿沖壓刀且不連續地設置。換言之，較佳的是，副刀並非以包圍沖壓刀之整個外周之方式設置。若以包圍沖壓刀之整個外周之方式設置，則有沖壓殘渣不必要地分離，而發生分離之沖壓殘渣載置於製品部分等之不良狀況之虞。且，藉由不連續地設置副刀，而能夠使在沖壓時點對膜施加之力良好地分散，且能夠更加減少膜之損傷。副刀之刀長之總計長度相對於沖壓刀之刀長較佳的是10%～80%，更佳的是30%～60%。副刀之刀長之總計長度可根據沖壓刀之俯視形狀、及沖壓之膜之特性適切地設定。在上述沖壓刀之俯視形狀係具有角隅部之形狀之情形下，較佳的是，上述副刀至少設置於沖壓刀之角隅部之該沖壓刀之外側(角隅部外側)。由於在沖壓時，在角隅部及屈曲部中對膜施加之力容易變得不均一，故較佳的是在該部分設置副刀。圖3(a)至圖3(d)係本發明之一實施形態之沖壓刀及副刀之放大平面圖。在沖壓刀10具有角隅部之情形下，該角隅部外側之副刀20可採用例如圖3(a)至圖3(d)之形狀。具體而言，角隅部外側之副刀20可為沿沖壓刀10之角隅且具有頂點之形狀(圖3(a))，可為沿沖壓刀10之角隅且不具有頂點(在頂點中斷)之形狀(圖3(b))，可為如局部地包圍該角隅之曲線狀(圖3(c))，亦可為直線狀且形成該角隅之一邊與副刀形成之角度a和形成該角隅之另一邊與副刀形成之角度b的差為020(較佳的是05)的形狀(圖3(d))。較佳的是，角隅部外側之副刀20係如圖3(b)所示般為沿沖壓刀10之角隅且不具有頂點之形狀。若如上述般角隅部外側之副刀隔以間隔而設置，則能夠使在沖壓時點對膜施加之力良好地分散，能夠更加減少膜之損傷。圖4係本發明之一實施形態之沖壓刀及副刀之概略剖視圖。此外，為了易於觀察，圖4之刀之高度、及間隙等之比率存在與實際不同之情形。較佳的是，沖壓刀10之刀高A高於副刀20之刀高B。如此，能夠在接觸時點對該膜施加充分的力。沖壓刀與副刀之刀高之差較佳的是5 μm～700 μm，更佳的是5 μm～500 μm，尤佳的是5 μm～200 μm，特佳的是5 μm～50 μm，最佳的是5 μm～15 μm。若為如以上之範圍，則在沖壓時點，能夠使對膜施加之力良好地分散。且，能夠防止沖壓殘渣之不必要之分離。沖壓刀與副刀之間隙X(頂點間距離X)可根據沖壓之膜之特性(材質、柔軟性)、形狀等設定為任意之適切距離。該間隙X較佳的是0.5 mm～4 mm，更佳的是0.5 mm～2.5 mm。只要能獲得本發明之效果，則該間隙以較小者為較佳。此係由於藉由縮小間隙而能夠減少沖壓殘渣，提高製品成品率之故。B. 膜之沖壓方法 圖5係說明一實施形態之本發明之膜之沖壓方法之概略圖。在該實施形態中，使用將上述刀模100安裝於基座板200而構成之沖壓機構300。在該實施形態中，在將膜500搬送至配置於該沖壓機構300下之切割板400上後，藉由使該沖壓機構300朝向膜500朝下方移動，或使切割板400朝向沖壓機構300朝上方移動，使刀模100抵接於膜500(實質上是沖壓刀抵接)並壓入，而將膜500沖壓，從而獲得特定形狀之膜片。上述副刀可貫通膜，亦可不貫通。較佳的是，副刀以不貫通膜之方式(亦即半切割膜之方式)設置。作為用於本發明之沖壓方法之膜可使用任意之適切的膜。在一實施形態中，將光學膜用作上述膜。作為光學膜可例舉例如偏光板、相位差膜等。先前，雖然光學膜會因沖壓導致之損傷(例如壓痕、剝離等)而容易影響其特性(光學特性)，但根據本發明，即便是如上述之光學膜，仍能夠抑制損傷而沖壓，而能夠獲得外觀及特性良好的膜。在一實施形態中，作為用於沖壓方法之膜使用積層膜。在先前之方法中，存在於沖壓積層膜後容易在該積層膜發生層間剝離(尤其是在膜片端部之剝離)之問題，但根據本發明，能夠抑制層間剝離而沖壓積層膜。用於沖壓方法之膜之厚度例如為0.15 mm～0.45 mm。用於沖壓方法之膜可為長條狀，亦可為片狀。較佳的是長條狀。在圖5所示之實施形態中，在使用長條狀之膜之情形下重複以下一系列之動作，即：在將被加工部分搬送至切割板上後，暫時停止搬送而如上述般進行沖壓加工，在完成一次沖壓加工後，將下一被沖壓之被加工部分搬送至切割板，而進行下一沖壓加工，從而所有長條狀偏光板被用於沖壓加工。C. 沖壓裝置 本發明之沖壓裝置係用於膜之沖壓者，其具備上述刀模。在一實施形態中，本發明之沖壓裝置係如圖5所示般具備：沖壓機構300，其係將上述刀模100安裝於基座板200而構成；及切割板400，其與沖壓機構300對向配置，且在沖壓時承接刀模100。根據本實施形態之沖壓裝置，在將作為被加工物之膜載置於切割板400上後，藉由使沖壓機構300朝向切割板400朝下方移動，或使切割板400朝向沖壓機構300朝上方移動，使刀模100抵接於偏光板500，而能夠沖壓膜。作為使沖壓機構及/或切割板移動之機構可採用任意的適切之機構。上述沖壓裝置可組合搬送被加工物之任意之適切的搬送裝置(例如搬送帶、搬送輥等)、及在沖壓後去除沖壓殘渣之任意之適切的去除裝置等而使用。 [實施例] 以下，利用實施例具體地說明本發明，但本發明並非由該等實施例限定。［實施例1］使用具備圖2所示之形狀之沖壓刀(刀高：1.2 mm)及副刀(刀高：1.12 mm)之刀模沖壓膜，而獲得24片膜片。作為膜係使用偏光板(日東電工社製「NZD-UFQAMEGQ1773VDUHC-ACJ」)與保護膜(日東電工社製「PPF-100T」)之積層體(厚度219 μm)。［實施例2］使用具備大致矩形狀之沖壓刀(刀高：1.2 mm)、及配置於該沖壓刀之4個角隅部之外側之副刀的刀模沖壓實施例1中使用之膜，而獲得膜片。角隅部外側之副刀之形狀係如圖3(a)所示般設定為沿沖壓刀之角隅且具有頂點之形狀。［實施例3］使用具備大致矩形狀之沖壓刀(刀高：1.2 mm)、及配置於該沖壓刀之4個角隅部之外側之副刀的刀模沖壓實施例1中使用之膜，而獲得膜片。角隅部外側之副刀之形狀係如圖3(b)所示般設定為沿沖壓刀之角隅且不具有頂點(在頂點中斷)之形狀。［實施例4］使用具備大致矩形狀之沖壓刀(刀高：1.2 mm)、及配置於該沖壓刀之4個角隅部之外側之副刀的刀模沖壓實施例1中使用之膜，而獲得膜片。角隅部外側之副刀之形狀係如圖3(c)所示般設定為如包圍角隅之曲線狀。［實施例5］使用具備大致矩形狀之沖壓刀(刀高：1.2 mm)、及配置於該沖壓刀之4個角隅部之外側之副刀的刀模沖壓實施例1中使用之膜，而獲得膜片。角隅部外側之副刀之形狀係如圖3(d)所示般設定為直線狀且形成角隅之一邊與副刀形成之角度a和形成該角隅之另一邊與副刀形成之角度b成為相同角度的形狀。［比較例1］除自刀模排除副刀以外，與實施例1相同地沖壓膜而獲得膜片。［比較例2］除自刀模排除副刀以外，與實施例2相同地沖壓膜而獲得膜片。［評估1］確認在實施例1及比較例1獲得之24片膜片之外觀，確認有無自膜片端部(沖壓刀抵接之部位)之長度具有700 μm以上之翹起(亦即積層膜之層間剝離)、及有無自膜端部(沖壓刀抵接之部位)之長度為1000 μm以上之壓痕。在表1中顯示產生上述翹起之膜片之片數、及產生上述壓痕之膜片之片數。 [表1] ［評估2］確認在實施例2至5及比較例2獲得之膜片之外觀，測定自膜片端部(沖壓刀抵接之部位)之翹起(亦即積層膜之層間剝離)之長度。在表2中結果。 [表2] A. Die die Figure 1 is a schematic plan view of a die die in one embodiment of the present invention. The die 100 includes a punching knife 10 and an auxiliary knife 20. The punching knife 10 has a closed top view shape. When the die 100 is used to punch the film, the punch 10 is used to punch the film. The auxiliary knife 20 is provided on the outer side of the punching knife 10. In one embodiment, the auxiliary knife 20 is arranged along the punching knife 10. FIG. 1 shows a die having only one set of punching knives and secondary knives, but the die of the present invention may have multiple sets of punching knives and secondary knives as shown in FIG. 2. In addition, if one set including a punching knife and a secondary knife is used, one film can be punched. In the case of stamping a film using the knife die of the present invention, a specific force is applied to the film at the point when the film and the stamping knife are in contact, and then the stamping knife is pressed towards the film (or the film is pressed towards the stamping knife). , The use of the auxiliary knife connected with the film to disperse the force applied to the film. As a result, it is possible to obtain a stamped film that reduces film damage and prevents indentation. In addition, in the case of a film-based laminate, the interlayer peeling of the film can be prevented. Hereinafter, for the convenience of explanation, the time when the film and the punching knife are in contact is called the contact time, and the time when the die is further pressed against the film from the contact time (or the time when the film is pressed against the knife) is called the punching time. situation. In addition, the film was cut at the time of punching. Any suitable cutting objects can be used as the punching knife and the auxiliary knife. Examples of knife objects used for punching knives and auxiliary knives include Thomson knives, rotting knives, and carving knives. The above-mentioned punching knife can have any suitable shape in plan view. Examples of the shape of the punching knife in plan view include a substantially square shape, a substantially rectangular shape, a substantially circular shape, and a substantially elliptical shape. In addition, the top view shape of the punching knife can be a shape that appropriately combines a straight line and a curve, and a shape composed of a plurality of curves with different curvatures. Preferably, the auxiliary knife is arranged discontinuously along the punching knife. In other words, it is preferable that the auxiliary knife is not arranged in such a way as to surround the entire periphery of the punching knife. If it is arranged to surround the entire periphery of the punching knife, the punching residue may be unnecessarily separated, and the separated punching residue may be placed on the product part. Moreover, by discontinuously disposing the auxiliary knife, the force applied to the film at the time of pressing can be well dispersed, and the damage of the film can be further reduced. The total length of the knife length of the auxiliary knife is preferably 10% to 80%, and more preferably 30% to 60% relative to the knife length of the punching knife. The total length of the knife length of the secondary knife can be appropriately set according to the top view shape of the punching knife and the characteristics of the punching film. In the case where the above-mentioned punching knife has a corner shape in plan view, it is preferable that the auxiliary knife is provided at least on the outer side of the punching knife (outside the corner portion) of the corner of the punching knife. Since the force applied to the film in the corners and flexures tends to become uneven during punching, it is preferable to provide a secondary knife in this part. Figures 3(a) to 3(d) are enlarged plan views of the punching knife and the auxiliary knife of one embodiment of the present invention. In the case where the punching knife 10 has a corner portion, the auxiliary knife 20 outside the corner portion may adopt the shape shown in FIGS. 3(a) to 3(d), for example. Specifically, the auxiliary knife 20 on the outside of the corner portion can be a shape that is along the corner of the punching knife 10 and has a vertex (Figure 3(a)), and it can be along the corner of the punching knife 10 and has no vertex (at the vertex). The shape of the interruption (Figure 3(b)) can be a curved shape that partially surrounds the corner (Figure 3(c)), or it can be straight and form the angle formed by one side of the corner and the auxiliary knife The difference between a and the angle b formed by the other side of the corner and the auxiliary knife is a shape of 020 (preferably 05) (Figure 3(d)). Preferably, the auxiliary knife 20 on the outside of the corner portion has a shape along the corner of the punching knife 10 and does not have a vertex as shown in FIG. 3(b). If the auxiliary blades on the outside of the corner portion are arranged at intervals as described above, the force applied to the film at the time of pressing can be well dispersed, and the damage of the film can be further reduced. Fig. 4 is a schematic cross-sectional view of a punch knife and an auxiliary knife according to an embodiment of the present invention. In addition, in order to facilitate the observation, the ratio of the height of the knife and the gap in Fig. 4 may be different from the actual situation. Preferably, the knife height A of the punching knife 10 is higher than the knife height B of the auxiliary knife 20. In this way, sufficient force can be applied to the film at the point of contact. The difference in height between the punching knife and the secondary knife is preferably 5 μm to 700 μm, more preferably 5 μm to 500 μm, particularly preferably 5 μm to 200 μm, particularly preferably 5 μm to 50 μm, The best is 5 μm～15 μm. If it is in the above range, the force applied to the film can be well dispersed at the time of pressing. And, it can prevent unnecessary separation of stamping residue. The gap X between the punching knife and the secondary knife (the distance between the vertices X) can be set to any suitable distance according to the characteristics (material, flexibility) and shape of the punched film. The gap X is preferably 0.5 mm to 4 mm, more preferably 0.5 mm to 2.5 mm. As long as the effect of the present invention can be obtained, the gap is preferably smaller. This is because by reducing the gap, stamping residue can be reduced and the product yield can be improved. B. Film stamping method Fig. 5 is a schematic diagram illustrating an embodiment of the film stamping method of the present invention. In this embodiment, a press mechanism 300 constructed by attaching the above-mentioned die 100 to the base plate 200 is used. In this embodiment, after the film 500 is transported to the cutting board 400 arranged under the punching mechanism 300, the punching mechanism 300 is moved downward toward the film 500, or the cutting board 400 is moved toward the punching mechanism 300. Move upward to make the die 100 abut against the film 500 (substantially abut against the punching knife) and press in, and the film 500 is punched to obtain a film of a specific shape. The above-mentioned auxiliary knife can penetrate the membrane or not. Preferably, the auxiliary knife is set in a manner that does not penetrate the film (that is, the manner of half-cutting the film). As the film used in the punching method of the present invention, any suitable film can be used. In one embodiment, an optical film is used as the above-mentioned film. As an optical film, a polarizing plate, a retardation film, etc. are mentioned, for example. In the past, although the optical film may easily affect its characteristics (optical characteristics) due to damage (such as indentation, peeling, etc.) caused by pressing, according to the present invention, even the above-mentioned optical film can still be pressed while suppressing damage. A film with good appearance and characteristics can be obtained. In one embodiment, a laminated film is used as the film used in the punching method. In the conventional method, there is a problem that interlayer peeling (especially peeling at the end of the film) easily occurs in the laminate film after the laminate film is punched, but according to the present invention, the laminate film can be punched while suppressing interlayer peeling. The thickness of the film used in the stamping method is, for example, 0.15 mm to 0.45 mm. The film used in the stamping method can be long or sheet-shaped. It is preferably a long strip. In the embodiment shown in Figure 5, the following series of actions are repeated when a long film is used, that is, after the part to be processed is transported to the cutting board, the transport is temporarily stopped and punching is performed as described above Processing: After finishing a stamping process, the next processed part to be stamped is transported to the cutting plate, and the next stamping process is performed, so that all the strip-shaped polarizing plates are used for the stamping process. C. Punching device The punching device of the present invention is used for film punching, and it is equipped with the above-mentioned die. In one embodiment, the punching device of the present invention is provided with a punching mechanism 300 as shown in FIG. 5, which is constructed by mounting the above-mentioned die 100 on the base plate 200; and a cutting plate 400 which is combined with the punching mechanism 300 It is arranged oppositely and accepts the die 100 during punching. According to the punching device of this embodiment, after the film as the workpiece is placed on the cutting board 400, the punching mechanism 300 is moved downward toward the cutting board 400, or the cutting board 400 is moved upward toward the punching mechanism 300 By moving, the die 100 is brought into contact with the polarizing plate 500, and the film can be punched. Any appropriate mechanism can be used as a mechanism for moving the punching mechanism and/or the cutting board. The above-mentioned pressing device can be used in combination with any suitable conveying device (for example, conveying belt, conveying roller, etc.) for conveying the workpiece, and any suitable removing device for removing the pressing residue after pressing. [Examples] Hereinafter, the present invention will be specifically explained using examples, but the present invention is not limited by these examples. [Example 1] The film was punched using a die with a punching knife (knife height: 1.2 mm) and a secondary knife (knife height: 1.12 mm) having the shape shown in Figure 2 to obtain 24 diaphragms. As the film system, a laminate (thickness 219 μm) of a polarizing plate ("NZD-UFQAMEGQ1773VDUHC-ACJ" made by Nitto Denko) and a protective film ("PPF-100T" made by Nitto Denko) was used. [Example 2] The film used in Example 1 was punched using a die with a roughly rectangular punching knife (knife height: 1.2 mm) and a secondary knife arranged outside the four corners of the punching knife. And get the diaphragm. The shape of the auxiliary knife on the outside of the corner portion is set as shown in Figure 3(a) to be along the corner of the punching knife and have a vertex. [Example 3] The film used in Example 1 was punched using a knife die equipped with a roughly rectangular punching knife (knife height: 1.2 mm) and secondary knives arranged outside the four corners of the punching knife. And get the diaphragm. The shape of the auxiliary knife on the outside of the corner portion is set to be along the corner of the punching knife as shown in Fig. 3(b) and has no vertex (interrupted at the vertex). [Example 4] The film used in Example 1 was punched using a knife die equipped with a roughly rectangular punching knife (knife height: 1.2 mm) and auxiliary knives arranged outside the four corners of the punching knife. And get the diaphragm. The shape of the auxiliary knife on the outside of the corner is set to be like a curve surrounding the corner as shown in Figure 3(c). [Example 5] The film used in Example 1 was punched using a knife die equipped with a roughly rectangular punching knife (knife height: 1.2 mm) and a secondary knife arranged outside the four corners of the punching knife. And get the diaphragm. The shape of the auxiliary knife on the outside of the corner is set as a straight line as shown in Figure 3(d) and forms the angle a formed by one side of the corner and the auxiliary knife and the angle formed by the other side of the corner and the auxiliary knife b becomes the shape of the same angle. [Comparative Example 1] The film was punched out in the same manner as in Example 1 except that the secondary knife was excluded from the knife mold to obtain a film sheet. [Comparative Example 2] The film was punched out in the same manner as in Example 2 except that the secondary knife was excluded from the knife mold to obtain a film sheet. [Evaluation 1] Confirm the appearance of the 24 diaphragms obtained in Example 1 and Comparative Example 1, and confirm whether there is a warp of 700 μm or more from the end of the diaphragm (the part where the punching knife abuts) (that is, laminated Peel between layers of the film), and whether there is an indentation with a length of 1000 μm or more from the end of the film (the part where the punching knife abuts). Table 1 shows the number of films that caused the above-mentioned warping and the number of films that caused the above-mentioned indentation. [Table 1] [Evaluation 2] The appearance of the film obtained in Examples 2 to 5 and Comparative Example 2 was confirmed, and the lift from the end of the film (the part where the punching knife abutted) (that is, the interlayer of the laminated film) was measured Stripped) length. Results in Table 2. [Table 2]

10‧‧‧沖壓刀 20‧‧‧副刀 100‧‧‧刀模 101‧‧‧刀模 200‧‧‧基座板 300‧‧‧沖壓機構 400‧‧‧切割板 500‧‧‧膜 A‧‧‧刀高 a‧‧‧角度 B‧‧‧刀高 b‧‧‧角度 X‧‧‧間隙/頂點間距離 10‧‧‧Stamping knife 20‧‧‧ Vice Knife 100‧‧‧Die 101‧‧‧Knife Mould 200‧‧‧Base plate 300‧‧‧Stamping mechanism 400‧‧‧Cutting board 500‧‧‧membrane A‧‧‧Knife Height a‧‧‧Angle B‧‧‧Knife Height b‧‧‧Angle X‧‧‧Gap/distance between vertices

圖1係本發明之一實施形態之刀模之概略平面圖。圖2係本發明之一實施形態之刀模之概略平面圖。圖3(a)至圖3(d)係本發明之一實施形態之沖壓刀及副刀之放大平面圖。圖4係本發明之一實施形態之沖壓刀及副刀之概略剖視圖。圖5係說明本發明之一實施形態之膜之沖壓方法之概略圖。Fig. 1 is a schematic plan view of a die of an embodiment of the present invention. Fig. 2 is a schematic plan view of a die of an embodiment of the present invention. Figures 3(a) to 3(d) are enlarged plan views of the punching knife and the auxiliary knife of one embodiment of the present invention. Fig. 4 is a schematic cross-sectional view of a punch knife and an auxiliary knife according to an embodiment of the present invention. Fig. 5 is a schematic diagram illustrating a film pressing method according to an embodiment of the present invention.

10‧‧‧沖壓刀 10‧‧‧Stamping knife

20‧‧‧副刀 20‧‧‧ Vice Knife

100‧‧‧刀模 100‧‧‧Die

Claims

A knife die, comprising: a punching knife with a closed top view shape, and a secondary knife arranged on the outer side of the punching knife, the secondary knife is arranged discontinuously along the punching knife, and the height of the punching knife is higher than the aforementioned The height of the secondary knife.

Such as the knife die of claim 1, wherein the top view shape of the punching knife has a corner shape, and the auxiliary knife is arranged at least on the outer side of the punching knife of the corner portion.

Such as the knife die of claim 2, wherein the top view shape of the auxiliary knife is a shape that follows the corners of the punch knife and does not have a vertex.

Such as the knife die of any one of claims 1 to 3, wherein the difference in knife height between the punching knife and the auxiliary knife is 5 μm to 700 μm.

A method for stamping a film, which includes stamping a film with a die as claimed in any one of claims 1 to 4.

The film stamping method of claim 5, wherein the aforementioned film is an optical film.

The film stamping method of claim 6, wherein the aforementioned film is a polarizing plate.

A film punching device is provided with a die as claimed in any one of claims 1 to 4.