1294824 九、發明說明 【發明所屬之技術領域】 • 本發明係有關於一種耐高溫保護膜之製造方法，尤指一種保 護膜在共押出成型時之料溫依照生產速度、產品厚度，以及厚度 均勻性加以調整，將料溫控制精度至少維持在± 1〇〇c内，藉高溫· 使部份高分子鏈產生熱分解，使斷裂的鏈段所含自由基形成粘性 •來源。再藉急速冷卻抑制結晶過程，使所產生之保護膜表面具平 ® 滑性，並增加保護膜粘著性。以此，俾保護膜成型時無需黏著層 之淋膜或塗膠過程，本身即具黏性，經真空成型（vacuum forming) 或熱壓成型後，保護膜仍容易撕下者。 【先前技術】 按，保制廣泛使贿歸與金屬板材絲面倾，例如： 聚碳酸醋(PC)板、壓克力⑽JA)板、聚苯乙烯(Gpps或HIps)板、 不伽板、及純等，俾贿送及齡棘巾，避免板材表面到 傷或受損。典型的保護臈係由基層與黏著層所構成，其中： 1·基層之材質提供保護膜所需的機械性質，如拉伸強度 (tensilestrength) ^(elongation) > A(modulus)# 〇 ¥用的基層材貝有紙與轉，如聚丙烯㈣、聚氯乙烯(⑽、聚 婦（）及I對苯一甲酸醋(pET)。其中屬於結晶性況用塑膠 的聚乙婦口為機械性質佳、安全無毒、而且容易取得，是使用最 κ、呆蒦膜原料之一。常用的聚乙稀原料包括··低密度聚乙烯 4 1294824 (LDPE)、中密度聚乙烯(MDPE)、高密度聚乙烯(HDpE)、或線性低 密度聚乙烯(LLDPE)，以及以上四類聚乙烯的混合料(blend)等。 2·黏著層的原料選擇須考慮黏性、成膜性、以及與基層的相 谷性(compatibility)。醋酸乙烯酯共聚物（ethylene-vinyl acetatecop〇lymer，以下簡稱EVA)是常用作黏著層的原料，非極 性的乙烯端提供與聚乙烯基層的相容性，而極性的醋酸酯則提供 黏著力。除了 EVA之外，其他常用的黏著層原料尚包括EMA、 Φ EMMA、EAA、SBS系橡膠等具有極性與非極性的材質。熟知塑膠膜 製耘技藝者可依保護板材種類、黏著性高低、使用溫度等選擇適 當的原料作為黏著層。 保護膜常用的成型方法包括淋膜、塗佈（膠）、及共押出等習 知的製程。雖然淋膜或塗膠可製造特殊規格的保護膜，共押出製 程則直接將基層與黏著層於薄膜押出製程中結合，免除淋膜或塗 佈的手續，是保護膜最常用的製程。共押出製程可分為吹膜法 • (blown film process)及平膜法(cast mm ，兩種方法 各具優缺點，但皆可用以製造習知的保護膜。 板材表面貼上保護膜之後常必須再經過另一道成型步驟，例 .如真空成型㈣麵forming)或熱壓成型（thermal f〇rming)壓製 •成各種形狀的最終成品。在成型過程中，保護膜會經歷典型的成 型溫度約200〇C。目前習知的黏著層原料皆有耐熱性不佳的缺 點，故無法使用於必須加熱的製程。原、因是腿或其他習知的黏 1294824 著層的黏性會隨著成型溫度升高而逐漸增加，經過上述成型步驟 後，在成型温度與成麵力的_之下，保護膜會緊緊黏附於成 •型後的成品表面而不易撕下或根本無法撕下，造成處理工時增 加，甚至造成不良瑕疵品。 【發明内容】 本發明人祕於習知賴醜在姆上，雜婦另一道成 S步職具有上顺失存在’乃加崎計改良射本發明之產 • 生。 . 敍，本發明之主要發明目⑽在提供-種可使用於熱壓成 型之保護膜。1294824 IX. INSTRUCTIONS OF THE INVENTION [Technical Fields According to the Invention] The present invention relates to a method for manufacturing a high temperature resistant protective film, and more particularly to a material having a uniform temperature in accordance with a production speed, a product thickness, and a uniform thickness of a protective film during co-extrusion molding. The properties are adjusted to maintain the temperature control accuracy at least ± 1 〇〇c. By high temperature, some of the polymer chains are thermally decomposed, so that the free radicals contained in the broken segments form a viscous source. The rapid cooling is used to suppress the crystallization process, so that the surface of the protective film produced is smooth and the protective film adhesion is increased. Therefore, the protective film is formed without the need of a laminating or gluing process of the adhesive layer, and is inherently viscous, and the protective film is still easily peeled off after vacuum forming or hot press forming. [Prior Art] According to the policy, the bribes are widely distressed with metal sheets, such as: polycarbonate (PC) board, acrylic (10) JA) board, polystyrene (Gpps or HIps) board, non-gauge board, And pure, etc., bribes and sprinkle the age to avoid injury or damage to the surface of the board. The typical protective lanthanum consists of a base layer and an adhesive layer, wherein: 1) The material of the base layer provides the mechanical properties required for the protective film, such as tensile strength (elongation) >A(modulus)# 〇¥ The base material of the base material is paper and transfer, such as polypropylene (four), polyvinyl chloride ((10), poly (p-) and I-p-benzoic acid vinegar (pET). Among them, the plastic mouth of the crystalline plastic is mechanical. Good, safe, non-toxic, and easy to obtain, it is one of the most κ, 蒦 蒦 raw materials. Commonly used polyethylene raw materials include · Low Density Polyethylene 4 1294824 (LDPE), Medium Density Polyethylene (MDPE), high density Polyethylene (HDpE), or linear low-density polyethylene (LLDPE), and blends of the above four types of polyethylene, etc. 2. The choice of raw materials for the adhesive layer must consider viscosity, film formation, and phase with the substrate. Compatibility. Ethylene acetate (copper) is commonly used as a raw material for the adhesive layer. The non-polar ethylene end provides compatibility with the polyethylene layer, while the polar acetic acid. Ester provides adhesion. In addition to EVA In addition, other commonly used adhesive materials include polar and non-polar materials such as EMA, Φ EMMA, EAA, and SBS rubber. Those skilled in the art of plastic film making can choose the type of protective sheet, adhesion, and temperature. Appropriate raw materials are used as the adhesive layer. The commonly used forming methods for protective films include conventional processes such as lamination, coating (glue), and co-extrusion. Although laminating or gluing can be used to make special protective film, the co-extrusion process is Directly combining the base layer and the adhesive layer in the film extrusion process, eliminating the need for lamination or coating, is the most commonly used process for the protective film. The co-extrusion process can be divided into a blown film process and a flat film method. Cast mm, both methods have their own advantages and disadvantages, but can be used to make a conventional protective film. After the surface of the board is pasted with a protective film, it is often necessary to go through another molding step, such as vacuum forming (four) surface forming) or hot pressing Forming (thermal f〇rming) pressing into the final product of various shapes. During the molding process, the protective film will undergo a typical molding temperature of about 200 ° C. The current adhesive layer is known. Both have the disadvantage of poor heat resistance, so they cannot be used in processes that must be heated. The original, because of the leg or other conventional adhesive 1294824, the viscosity of the layer will gradually increase as the molding temperature increases, after the above molding steps After that, under the molding temperature and the surface force, the protective film will adhere tightly to the surface of the finished product, which is not easy to tear off or can not be torn at all, resulting in an increase in processing time and even a bad product. SUMMARY OF THE INVENTION The inventor of the present invention is acquainted with the fact that Lai ugly is on the squad, and the other woman who has become a S step has the existence of a loss of existence. The main object (10) of the present invention is to provide a protective film which can be used for hot press forming.
本發明之主要特㈣在倾财㈣製財，㈣適當的料 溫以及薄絲關平坦度，俾使保護驗生適#軸性。料溫依 照生產速度、產品厚度，及厚度均勻性細，料溫控制精度 至少維持在±叱内，藉高溫使部分高分子鏈產生熱分解 的鏈段所含自由基形成祕來源。再藉急速冷卻抑制結晶過心 使保遵膜表面平坦如鏡面，增加俾罐贈朴从 «刀口侏邊胰枯性。俾保護膜成型時無 需黏著層之淋膜或_過程’本身即具雛，經真空成型(_ forming)或熱壓成型後，保護膜仍容易撕下者。 有關本發日縣達成上述目的與姐，轉—触可行實施例 並配合圖式詳細制如下，俾使審查封更易於瞭解本發明之產 生0 !294824 【實施方式】 本發明實施例之保護膜以結晶性泛用塑膠聚乙烯原料為例， ^細說明本發明所稱的耐熱型保護膜的製作方法。保護膜成型 日r聚乙烯原料料溫須控制在2⑼〜綱。C之間。實際溫度必須依 ，原料規格(如密度、流動指數等）、生產速度、_厚度，以及 厚度刀佈均勻性等作調整，而且溫度控制精確度至少維持在以 2藉同使部分聚乙烯的分子鏈產生熱分解，俾斷裂的鏈段所 3自由基形成保護膜紐來源。再者，因聚乙婦冷卻結晶時，結 晶伴隨體積收縮之關係，保護膜表面會有微小而不的凹凸Ϊ 本發明再利用急速冷卻抑獅晶棘，使賴絲面具有平坦 性，增加保護膜的枯著性。 口為/、押出保§細係直接成型，不需另外淋膜或塗膠製程， 節省加=賴’具製造省工、降低製造成本之功效。再者，保護 膜的黏著性伽由控制高分子鏈之齡解、嶋舰所含自由基 所形成，再對保護膜表面之粗度加以控制，免除習知的黏著層原 料’使保細雜耐高溫的雛。轉料贱髓細過程後， 保護膜娜易撕下。是以，本發明㈣知具隸姻性及進步性。 ^上述’本發明不僅具產業利用性且具發明、新穎性，依 献出U專利申請，騎㈣審查並辭核准，實感德便。The main features of the present invention are (4) making money in the fortune (4), (4) proper material temperature and flatness of the wire, so as to protect the test. According to the production speed, product thickness, and thickness uniformity, the material temperature control accuracy is maintained at least within ±叱, and the high temperature causes the radicals in the thermal decomposition of some polymer chains to form a secret source. Then use the rapid cooling to suppress the crystallization of the heart. The surface of the film is as flat as the mirror surface, and the 俾 can be given from the edge of the knife. When the protective film is formed, there is no need for the coating of the adhesive layer or the process itself, and the protective film is still easily peeled off after vacuum forming (_forming) or hot press forming. The present invention is directed to the above-mentioned purpose and sister, and the following is a detailed description of the following examples, so that the examination seal can be more easily understood to produce the invention. 0!294824 [Embodiment] The protective film of the embodiment of the present invention Taking the crystalline general-purpose plastic polyethylene raw material as an example, the method for producing the heat-resistant protective film referred to in the present invention will be described in detail. Protective film molding Day r polyethylene raw material temperature must be controlled at 2 (9) ~ Gang. Between C. The actual temperature must be adjusted according to the raw material specifications (such as density, flow index, etc.), production speed, thickness, and thickness uniformity, and the temperature control accuracy is maintained at least at the same time as the molecular weight of the polyethylene. The chain is thermally decomposed, and the 3 radicals in the cleavage segment form a protective membrane source. Furthermore, due to the relationship between the crystal shrinkage and the volume shrinkage, the surface of the protective film may be minute and not uneven. The present invention re-uses the rapid cooling of the lion's spine to make the silk surface flat and increase the protection. The dryness of the membrane. The mouth is /, the stipulation is fine and direct molding, no need for additional laminating or gluing process, saving the cost of manufacturing and labor saving, reducing manufacturing costs. Furthermore, the adhesion of the protective film is controlled by controlling the age of the polymer chain and the free radicals contained in the ship, and then controlling the thickness of the surface of the protective film to eliminate the conventional adhesive layer material. High temperature resistant chicks. After the process of transferring the pulp, the protective film is easily peeled off. Therefore, the invention (4) is known to be marital and progressive. ^The above invention is not only industrially useful, but also has inventions and novelty. It is based on U patent application, riding (four) review and resignation approval, and it is really sensible.