經濟部中央標準局貝工消費合作社印製 20501^ A 6 ____B6_ 五、發明説明（1 ) 持術節Μ 本發明僳關於使用一種拉伸包裹薄膜來包裹物件。特 別，本發明僳關於使用一種拉伸包裹薄膜來包裹經軋製之 和其他産物，例如：紙，氈，不織布，纖維捲筒。 带署抟蠤 拉伸包裹薄膜是所熟知者。舉例而言，美國專利案 4657982僳1987年4月14日准專利之頒予 Breck和Molli.son者，掲示自下列各聚合物所造成之拉 伸包裹膜：.以重置計80 — 90%聚乙烯，以重量計， 0. 5至10. 0%聚丁嫌（具有自500至1500之 數均分子置）及以重置計，0. 5至10. 聚丁烯（ 具有自1 700至10000之數均分子置）。1978 年11月30日所公告之西德專利案2 8 2 1 7 3 3 A49 (頒予英國賽璐芬有限公司）者掲示：製迪適合供 使用於旋轉包裹應用之包裹薄膜的方法，包括：擠壓PE 與以重量計0. 5至10%聚異丁烯的摻合物而形成薄膜 ,並處理薄膜的一個表面以電暈放電。例示低密度PE。 1 982年6月29日准專利之頒予ciimenhage和Ea-die之美國專利案4, 337，188亦記述：自下列各 化合物所造成之依附薄膜：聚烯烴，一種彈性體，一種或 多種N, N —雙（2 —羥乙基）烷基胺，一種礦物油，一 種液態聚烯烴，和有機磷酸酯，聚乙二醇，甘油油酸酯和 N— （3—烷氣基一2—羥丙基）乙醇胺。 (請先閲讀背面之注意事項再填窝本頁) 裝. -訂· 線· 本紙張尺度逍用中圉國家標準(CNS)甲4規格(210x297公龙) -3 - 205016 A6 B6 經濟部中央標準局貝工消費合作社印製 五、發明説明（2) 亦熟知：以旋轉包裹操作來包裹物件，因此使物件琢 繞一支垂直軸而轉動。包裹此等物件所使用之薄膜，通常 像自低密度PE或以傅統之吹膜過程，與至少一種聚丁烯 相摻合之線型低密度PE所造成。薄膜厚度通常是自20 « m至3 0 /i m。曾試圖使用線型低密度P E薄膜，在水 平樑上，包裹大的捲筒原料，例如：紙、氈等，或包裹重 物件，例如：磚在蓮纱箱上均未成功；於此情況，所使用 之薄膜僳使用傳统式吹膜過程予以造成，並具有大約51 y m厚度。此等嘗試顯示：薄膜的不均勻拉伸，尤其是如 果將它預拉.伸至至少大約1 00%。以較大之比率來預拉 伸有造成薄膜中，高出現率破裂之趨勢。此等方法浪費了 。本發明意欲減少前述之各種困難。 本發明肉容 因此，本發明提供對於使用拉伸包裹薄膜包裹物件之 方法的改進，其中，薄膜是至少45wm厚，並像自一種 聚合物摻合物所造成，此摻合物包括：ί)自1至20 wt%至少一種聚丁烯（具有自500至1 0000的數 均分子量）及ii)由下列各項所組成之該群中所選出之 PE:具有自0. 905至0. 940g/cm3密度之 至少一種線型乙烯/C 4 一 C』。α —烯烴共聚物，及此 共聚物與第二聚合物之摻合物，第二聚合物選自：乙烯的 均聚物和乙烯與酯酸乙烯酯的共聚物，該第二聚合物具有 自0. 910至0. 940g/cm3密度，ΡΕ具有至 (請先閲讀背面之注意事項再填寫本頁) 裝* -訂. 線· 本紙張尺度逍用中國國家標準（CNS)甲4規格(210X297公泄) 205016 A 6 B6 經濟部中央標準局員工消費合作社印製 五、發明説明（3) 多70wt%第二聚合物，及其中，該薄膜具有低結晶度 Ο 物件宜是圓筒形，並具有國形横截面。 在一個具體實施例中，物件具有至少大約1. 5之長 度v s高度之比率。 在該方法的另外具體賓施例中，在包裹物件前，立即 將薄膜預拉伸至少400¾。 在仍有另外之具鳗實施例中，乙烯/ C4 — Ci〇 α-烯烴共聚物是具有密度自0. 910至0. 930g / c m 3之，乙烯/辛烯一 1共聚物，或乙烯/已烯一1共 聚物。 在另外具體實施例中，聚丁烯具有自700至 5000之數均分子量，特別自900至3000。 在仍有另外之具髏實施例中，聚合物摻合物含有自2 至12wt%聚丁烯，特別自3至l〇wt%。 在另外之具體實施例中，該薄膜具有自50 wm至 1 l〇wm之厚度。 在另外之具體實施例中，薄膜之光澤是至少大約90 %，僳以20°反射角，使用（美國材料試驗學會） ASTM程序D—2457所測得。 在另外具體實施例中，薄膜的光澤是自90至12 0%。 在另外具體實施例中，薄膜之濁度是自大約4%至6 %,如使用ASTM程序D—1003所測得。 (請先閲讀背面之注意事項再填窝本頁) 裝· -訂- 線< 本紙張尺度逍用中國國家標準(CNS)甲4規格(210x297公¢) 205016 A6 _ B6 經濟部中央標準局貝工消費合作社印製 五、發明説明（4) 本發明特別適合於包裹大或重之物件。在一個具體實 施例中，物件是一捲軸的紙，織物或氈。物件較通常是在 一具水平式包裹機器上予以包裹，因為支持物件之重量或 水平式捲嬈較便利，唯如果便利，亦可使用垂直式包裹機 器。 除非在其他情況載明，本文中所述及之聚丁烯的分子 量是使用ASTM 程序D-2503-67所測定之數 均分子量。 術語 > 聚丁烯〃如本文中，關於本發明所使用者，乃 述及具有佔,優勢基於正丁烯或異丁烯的主鏈之聚合物。聚 丁烯類，商業上以聚異丁烯而著稱，可以由催化聚合一種 富含異丁烯之混合物而造成，而以較多之1與2—丁烯摻 合入較低分子置聚異丁烯中，而非摻合入較高分子置聚異 丁烯中。聚丁烯亦可經由低溫催化方法，自含有可聚合之 烯烴，尤其是異丁烯之煉油廠氣流予以合成。 薄膜組成物的各組份可以經由此項技蓊中所熟知之方 法予以摻合，例如：可將各組份預摻合，可將聚丁烯摻合 入母體濃縮物中，然後經由與PE相摻合而$稀釋"，或 可將聚丁烯直接注射入薄膜擠製機中。無論如何，為了提 供儘可能均勻之薄膜，應將聚丁烯與PE充分混合。可將 摻合物在平膜或吹膜過程中，直接擠製成為薄膜形式，而 致使薄膜具有低結晶度，如下文中更完全所述。 結晶度，在本發明薄膜中，不易測量，但是結晶度之 指示可以經由薄膜的透明度而示出。結晶度的指示器是薄 (請先閲讀背面之注意事項再填寫本頁) 裝- 訂_ 線· 本紙張尺度逍用中國國家標準(CNS)甲4規格(210x297公龙) -6 - 205016 A6 B6 經濟部中央樣準局貝工消費合作社印製 五、發明説明（5 ) 膜的光澤和灞度等程度。光澤你由以20°反射角所測置 之ASTM程序D—2457予以Μ計，而灞度則以 ASTM程序〇— 1 00 3予以測置，兩者使用5 1//111 厚薄膜。在本發明的上下文中，需要至少90炻之光澤程 度，而較佳之级位是自90%至120%。以自大約4% 至大約6%之濁度位準為佳，尤其是自4%至5. 5%。 為了比較，經由傳統式方法所造成之薄膜具有：自大約 35%至70%的光渾強度及自7%至15%之漘度。 吹膜之方法是用以形成使用於本發明中之薄膜的較佳 方法。在吹;膜方法中，將聚合物摻合物通過一個圖形模予 以擠壓。所得之薄膜，經由合作之軋棍，自棋中拉出，此 合作之軋輥，在軋點上，使管形膜陷縮。圓形之模與軋點 間之管形膜有時稱為膜泡。當在溶融或塑料成形狀態時， 管形膜，經由通過圓形模的中央之一個銳孔，被纳入膜泡 中之空氣或惟性氣髖而膨脹。該薄膜可乘其在塑料形成狀 態時，經由導引空氣在薄膜之外部予以冷卻。冷卻薄膜直 至它呈固態冷卻至固態有時稱為驟冷。薄膜冷卻愈快，結 晶度之程度愈低。在吹膜方法中，快速驟冷可以經由通過 膨脹之薄膜環繞一値冷卻之心軸予以實現（此心軸位於膜 胞以内）。使用冷卻之心軸的此種方法，掲示於1972 年2月15日頒予Μ· Biinga和C.V. Thornes之加拿大 專利案893 216中。自薄膜至心軸之快速熱傳遞可 以經由使用一種氣體在膜泡的内部予以改進，此氣體具有 優良之熱傳遞性質，例如He。此方法可能提供本發明中 (請先閲讀背面之注意事項再填窝本頁) 裝· 訂- -線- 本紙張尺度逍用中國國家樣準(CNS)甲4規格(210X297公釐) -7 - 205016 A6 B6 經濟部中央標準局貝工消費合作社印製 五、發明説明（6) 所漘要之結晶度的程度。傅統式吹膜方法不具有迅速驟冷 ，亦不容許發展所霈要程度的結晶度。 應了解者：本發明中所使用之薄膜可含有U V光安定 劑，顔料，抗氧化劑和此項技藝中所熟知之其他改良劑。 本發明亦可經由參照下列實施例而予以更佳了解： 窨施例I : 在一具水平式拉伸包裹裝置上，試圖將一大捲的不織 布，使用5 1 // m厚拉伸包裹膜（對照）予以拉伸包裹。 此薄膜像自聚丁烯與線型低密度PE的摻合物所造成，此 接合物像使用傳統式吹膜方法予以造成薄膜。該裝置能以 自50至650%之比率，將薄膜預拉伸。該薄膜僳以非 均勻方式而産生，並具有缺乏高預拉伸能力之趨勢並具有 不充分之缠合，（在50至100%之預拉伸比率時）。 該膜易於拉伸，然後拉伸失效而形成：2 5至5 0mm寬， 5 1 jum厚，雄以1 jum厚長度之横向「小路」。未經拉 伸之部份是混濁而經拉伸之部份則透明。高於100¾的 拉伸比率，該膜較經常易於破裂，而造成生産率的損失。 使用具有51wm厚度，以傳統式吹膜方法，自非線型 PE所造成之拉伸包裹薄膜，見到相似之性能。 使用吹膜方法，將與「對照樣品」相似之薄膜組成物 吹製成薄膜形式，此方法中，有冷卻之金屬心軸及He氣 在薄膜泡之内部。該薄膜（薄膜A),較「對照」薄膜， 大體上較少結晶，如經由薄膜A之透明度所顯示，與對照 (請先閲讀背面之注意事項再蜞窝本頁) 裝. - 線< 本紙張尺度逍用中B國家標準(CNS)甲4規格(210X297公釐) 205016 Α6 Β6 經濟部中央標準局貝工消費合作社印製 五、發明説明（7) 薄膜中之缺乏透明度相反；且與「對照」薄膜相比較，薄 膜A無混濁。雖然對於如此實例中所使用之薄膜A,未予 測量光澤及混濁，但是在相似狀況下所造成之，具有相同 組成之薄膜，具有100. 2%之光澤及5. 1%之濁度 (十次测量之平均值）。以50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 60 ◦和650%的預拉伸比率，使用 薄膜A包裹大捲的紙張。在整個預拉伸比率範圍内，未見 到薄膜破裂。附帶，薄膜在所有預拉伸比率時，予以均勻 拉伸，並保持缠合性質。另外，在拉伸後，該薄膜是結晶 透明。此實例顯然證明：具有低結晶度之薄膜性能的出人 意料之改進。 奮掄例I 將十八捲筒的合成纖維，在一具垂直拉伸包裹機器上 ，予以包裹成為三層單元。然後使用第二具垂直拉伸包裹 機器，將兩値三層單元包裹在一起被使用以拉伸包裹各捲 筒與各單元之薄膜是一種3 Ό. 5 /im厚商業上可供應之 傳統式拉伸包裹PE薄膜。預拉伸比率是大約120%。 在被環繞各捲筒與單元包裹後，該薄膜是混濁並顯示不均 勻拉伸，有時此項技藝中稱為：粗條紋。另外，雖然本方 法一般進行良好，但有薄膜破裂的一個時期。每一包捆， 需要大約200g之薄膜。 然後將該薄膜，用實例I之薄膜A代替，並以自 (請先閲讀背面之注意事項再填窝本頁} 裝· 線. 本紙張尺度逍用中Η 0家標準(CNS)甲4規格(210x297公釐） -9 - 205016 A6 B6 五、發明説明（8) 350至450%之預拉伸比率予以操作。雖然在450 %的預拉伸比率時，經驗到低破裂頻率，但是在_3 5 0, 375與425%時，沒有破裂。該薄膜均勻地拉伸，且 僳透明。毎一包捆，需要大約125g之薄膜。此實例清 楚地證明：本發明的改進之性能。 (請，先閲讀背面之注意事項再填窝本頁) -訂< 線· 經濟部中央標準局員工消費合作社印製 本紙張尺度逍用中國Η家標準(CNS)甲4規格(210x297公龙) -10 -Printed by the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. 20501 ^ A 6 ____B6_ V. Description of the invention (1) Holding section M The present invention relates to the use of a stretch wrapping film to wrap objects. In particular, the present invention relates to the use of a stretch wrap film to wrap rolled and other products, such as paper, felt, non-woven fabrics, and fiber rolls. It is well-known to stretch the wrap film with a squash. For example, in the US Patent No. 4657982 issued to Breck and Molli.son on April 14, 1987, the stretch wrapping film caused by the following polymers is shown: 80-90% by replacement Polyethylene, by weight, 0.5 to 10. 0% polybutene (with a number average molecular weight of from 500 to 1500) and by reset, 0.5 to 10. Polybutene (with from 1 700 Numbers up to 10000 are set at the numerator). The West German Patent Case 2 8 2 1 7 3 3 A49 (issued to Cellophane Ltd., UK), announced on November 30, 1978: The method of making wrapping film suitable for use in rotary wrapping applications, including : Extruding a blend of PE and 0.5 to 10% by weight of polyisobutylene to form a film, and treating one surface of the film to corona discharge. Examples of low density PE. US Patent No. 4, 337, 188 issued on June 29, 982 to ciimenhage and Ea-die, which is a quasi-patent, also states: Dependent films caused by the following compounds: polyolefin, an elastomer, one or more , N-bis (2-hydroxyethyl) alkylamine, a mineral oil, a liquid polyolefin, and organic phosphates, polyethylene glycol, glyceryl oleate, and N- (3-alkane- 2- Hydroxypropyl) ethanolamine. (Please read the precautions on the back before filling the nest page). Packing.-Order · Thread · This paper is used in the national standard (CNS) A 4 specifications (210x297 male dragon) -3-205016 A6 B6 Central Ministry of Economic Affairs Printed by the Beigong Consumer Cooperative of the Bureau of Standards 5. Description of the invention (2) It is also well known that the object is wrapped by a rotating wrapping operation, so the object is turned around a vertical axis. The film used to wrap these objects is usually caused by a low-density PE or a linear low-density PE blended with at least one polybutene in a conventional film blowing process. The film thickness is usually from 20 «m to 30 / im. Attempted to use linear low-density PE film to wrap large rolls of raw materials, such as paper, felt, etc., on the horizontal beam, or to wrap heavy objects, such as bricks on the lotus box. The film used was created using a traditional film blowing process and has a thickness of approximately 51 μm. These attempts have shown that the film is unevenly stretched, especially if it is pre-stretched to at least about 100%. Pre-stretching at a larger ratio has a tendency to cause cracking in the film at a high rate. These methods are wasted. The present invention intends to reduce the aforementioned difficulties. Therefore, the present invention provides an improvement to the method of wrapping an object using a stretch-wrapped film, where the film is at least 45 wm thick and is caused by a polymer blend including: ί) From 1 to 20 wt% of at least one polybutene (having a number average molecular weight of from 500 to 10,000) and ii) PE selected from the group consisting of: having from 0.905 to 0.940 g / cm3 density of at least one linear ethylene / C 4 -C ”. α-olefin copolymer, and a blend of this copolymer and a second polymer, the second polymer is selected from: a homopolymer of ethylene and a copolymer of ethylene and vinyl ester, the second polymer has 0. 910 to 0. 940g / cm3 density, PE has to (please read the precautions on the back and then fill out this page) Pack *-order. Thread · This paper standard uses the Chinese National Standard (CNS) A 4 specifications (210X297 (Published) 205016 A 6 B6 Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of the invention (3) More than 70% by weight of the second polymer, and among them, the film has low crystallinity With a cross-section of the national shape. In a specific embodiment, the object has a ratio of length v s height of at least about 1.5. In another specific embodiment of the method, the film is pre-stretched at least 400¾ immediately before wrapping the object. In still other embodiments with eels, the ethylene / C4-Cio-α-olefin copolymer is a copolymer having a density of from 0.910 to 0.930 g / cm 3, an ethylene / octene-1 copolymer, or ethylene / Alkene-1 copolymer. In another specific embodiment, the polybutene has a number average molecular weight of from 700 to 5000, especially from 900 to 3000. In still other skeletal embodiments, the polymer blend contains from 2 to 12 wt% polybutene, particularly from 3 to 10 wt%. In another specific embodiment, the film has a thickness of from 50 wm to 110 wm. In another specific embodiment, the gloss of the film is at least about 90%, measured at a reflection angle of 20 ° using (American Society for Testing and Materials) ASTM procedure D-2457. In another specific embodiment, the gloss of the film is from 90 to 120%. In another specific embodiment, the haze of the film is from about 4% to 6%, as measured using ASTM program D-1003. (Please read the precautions on the back before filling the nest page) Binding · -booking-line < This paper size is easy to use Chinese National Standard (CNS) A 4 specifications (210x297 g) 205016 A6 _ B6 Central Bureau of Standards, Ministry of Economic Affairs Printed by Beigong Consumer Cooperative V. Description of the invention (4) The invention is particularly suitable for wrapping large or heavy objects. In a specific embodiment, the object is a roll of paper, fabric or felt. The objects are usually wrapped on a horizontal wrapping machine, because the weight of the supporting object or the horizontal wrapping is more convenient, but if it is convenient, the vertical wrapping machine can also be used. Unless otherwise stated, the molecular weight of the polybutene mentioned herein is the number average molecular weight determined using the ASTM procedure D-2503-67. Terminology > Polybutene 〃 As used herein, with regard to the user of the present invention, it refers to a polymer having a dominant, predominantly n-butene or isobutene backbone. Polybutenes, known commercially as polyisobutylene, can be caused by the catalytic polymerization of a mixture rich in isobutylene, and more of 1 and 2-butene are blended into lower molecular weight polyisobutylene instead of Blended into higher molecular polyisobutylene. Polybutene can also be synthesized from the gas stream of a refinery containing polymerizable olefins, especially isobutylene, by a low-temperature catalytic method. The components of the film composition can be blended by methods well known in the art, for example: the components can be pre-blended, polybutene can be blended into the parent concentrate, and then combined with PE It can be blended and "diluted", or the polybutene can be injected directly into the film extruder. In any case, in order to provide as uniform a film as possible, polybutene and PE should be thoroughly mixed. The blend can be directly extruded into a film form during flat or blown film, resulting in a film with low crystallinity, as described more fully below. The crystallinity is not easy to measure in the film of the present invention, but the indication of crystallinity can be shown by the transparency of the film. The crystallinity indicator is thin (please read the precautions on the back before filling in this page) Binding-Order _ Thread · This paper scale uses the Chinese National Standard (CNS) A 4 specifications (210x297 male dragon) -6-205016 A6 B6 Printed by Beigong Consumer Cooperative of the Central Bureau of Samples of the Ministry of Economic Affairs V. Invention Description (5) The degree of gloss and balinese of the film. The gloss is measured by ASTM program D-2457 measured at a reflection angle of 20 °, and the Ba is measured by ASTM program 〇-1 00 3, and both use 5 1 // 111 thick films. In the context of the present invention, a gloss of at least 90 stoneware is required, and the preferred level is from 90% to 120%. 5%。 Preferably from about 4% to about 6% turbidity level, especially from 4% to 5.5%. For comparison, the film produced by the conventional method has a light haze strength from about 35% to 70% and a lightness from 7% to 15%. The film blowing method is the preferred method for forming the film used in the present invention. In the blown film method, the polymer blend is extruded through a graphic die. The resulting film is pulled out of the game through a cooperative roller, and the cooperative roller causes the tubular film to collapse at the nip. The tubular film between the circular die and the rolling point is sometimes called a bubble. When in a molten or plastic-forming state, the tubular membrane expands through the air or unique air hips that are incorporated into the membrane bubble through a sharp hole in the center of the circular die. The film can be cooled outside the film by guiding air while the plastic is in a state of formation. Cooling the film until it cools to a solid state is sometimes called quenching. The faster the film cools, the lower the degree of crystallinity. In the blown film method, rapid quenching can be achieved by expanding the film around a cooling mandrel (this mandrel is located inside the cell). This method of using a cooling mandrel is shown in Canadian Patent Case 893 216 issued to M. Biinga and C.V. Thornes on February 15, 1972. The rapid heat transfer from the film to the mandrel can be improved by using a gas inside the bubble, which has excellent heat transfer properties, such as He. This method may provide in the present invention (please read the precautions on the back before filling the nest page) Binding · Binding-This paper scale is easy to use China National Standards (CNS) A 4 specifications (210X297 mm) -7 -205016 A6 B6 Printed by the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Invention Description (6) The degree of crystallinity required. The Futong blown film method does not have rapid quenching, nor does it allow the development of the desired degree of crystallinity. It should be understood that the film used in the present invention may contain UV stabilizers, pigments, antioxidants and other modifiers well known in the art. The present invention can also be better understood by referring to the following examples: Example I: On a horizontal stretch wrapping device, an attempt was made to use a 5 1 // m thick stretch wrapping film on a large roll of nonwoven fabric (Control) Stretch wrap. The film is caused by a blend of polybutene and linear low-density PE, and the joint is formed into a film using a conventional film blowing method. The device can pre-stretch the film at a rate from 50 to 650%. The film is produced in a non-uniform manner, has a tendency to lack high pre-stretching ability and has insufficient entanglement (at a pre-stretching ratio of 50 to 100%). The film is easy to stretch, and then stretched to fail to form: 25 to 50 mm wide, 5 1 jum thick, and a lateral "path" with a length of 1 jum thick. The unstretched part is turbid and the stretched part is transparent. Above a stretch ratio of 100¾, the film is more likely to break, causing loss of productivity. Using a stretch-wrapped film made of non-linear PE with a thickness of 51wm using traditional film blowing methods, similar performance is seen. The film composition similar to the "control sample" is blown into a film form using a film blowing method. In this method, a cooled metal mandrel and He gas are inside the film bubble. This film (film A), compared to the "control" film, is substantially less crystallized, as shown by the transparency of film A, and the control (please read the precautions on the back before slurring this page). Thread < This paper is used in China National Standard (CNS) Grade A (210X297mm) 205016 Α6 Β6 Printed by the Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of the invention (7) The lack of transparency in the film is contrary to Compared with the "control" film, film A was free of turbidity. Although for the film A used in this example, gloss and turbidity were not measured, the film with the same composition caused by similar conditions had a gloss of 100.2% and a turbidity of 5.1% (ten The average of the measurements). Using film A to wrap large rolls of paper at 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 60 ◦ and a pre-stretch ratio of 650%. No cracking of the film was observed in the entire range of pre-stretch ratio. Incidentally, the film is uniformly stretched at all pre-stretch ratios, and maintains the entanglement properties. In addition, after stretching, the film was crystal clear. This example clearly demonstrates the unexpected improvement in the performance of thin films with low crystallinity. Fen Tuan I I wrapped eighteen rolls of synthetic fiber on a vertical stretch wrapping machine and wrapped it into a three-layer unit. Then use a second vertical stretch wrapping machine to wrap two three-layer units together to be used to stretch wrap each roll and the film of each unit is a 3 Ό. 5 / im thick traditional type commercially available Stretch wrapped PE film. The pre-stretch ratio is about 120%. After being wrapped around each reel and unit, the film is turbid and shows uneven stretching, sometimes referred to as thick stripes in this technique. In addition, although this method generally works well, there is a period when the film breaks. Each bundle requires approximately 200g of film. Then replace the film with the film A of Example I, and replace it with (Please read the precautions on the back side before filling the nest page). Packing and threading. This paper standard is used in the Η 0 standard (CNS) A4 (210x297mm) -9-205016 A6 B6 V. Description of the invention (8) 350 to 450% pre-stretch ratio is operated. Although at 450% pre-stretch ratio, low rupture frequency is experienced, but in 3 5 0, 375 and 425%, there is no crack. The film is stretched uniformly and transparent. Each bundle requires about 125g of film. This example clearly proves: the improved performance of the present invention. 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